The Call of the Open Sidewalk
From a place slightly to the side of the more popular path
User Tools
Site Tools
Could Age Replace OpenPGP?
Age is a utility and library to do public key and symmetrical encryption/decryption in a simple and straightforward way1). The idea that age could replace OpenPGP comes up from time to time.
OpenPGP based systems are used for multiple purposes…
In terms of actual use, this is probably the most important function of OpenPGP. The value here is mostly the well supported and standardized signature standard provided by OpenPGP. Age does not do signing at all.
Age is obviously not intended for this purpose.
Messaging is all about identities. Age provides no identity management at all. Again, it doesn't even do signatures.
Age is obviously not intended for this purpose either.
Email already has two working and widely implemented encryption standards (OpenPGP and S/MIME). Messaging is mostly about standards. Even if someone were to build out age to do messaging it would be irresponsible to promote it as a third standard for email.
Encrypted Backups
This (and encrypted long term storage in general) is where age has purpose. Let's say you use GnuPG as an OpenPGP implementation to encrypt a backup, that backup becomes corrupt and then you use this command line to decrypt it and unarchive it all in one go:
$ gpg2 -d backup.tgz.pgp | tar xz
GnuPG then dumps the unencrypted file, corruption and all, to tar. When it hits the end it does an integrity check which would fail with this message:
 gpg: WARNING: encrypted message has been manipulated!
Then GnuPG would return an error.
The issue here is that tar might of had to deal with garbage for input. A potentially more serious issue would be if a malicious entity had enough knowledge of the unencrypted backup to allow them to modify files and/or file locations in a purposeful way. This might be a concern if you store your backups on a server that is not under your control.
Age does an integrity check every 64KB along the encrypted stream. If the integrity check fails then it does not release the bad 64KB chunk and errors out thus truncating the output. This allows an attacker to terminate your process at any point they choose. The assumption here is that no data or partial data is better than bad data.
The solution to the GnuPG bad data and the age truncated data is the same. Check the integrity of the input file before attempting to do anything with it. I would think this step would be mandatory in a case where there is a possibility that someone might attempt to modify your encrypted file(s). A manual integrity check could be as simple as running GnuPG and dumping the output to see if an error message shows up:
$ gpg2 -d backup.tgz.pgp >/dev/null
Data Recovery
To be clear, "recovery" here is the sifting of good data from bad. Neither age or GnuPG can regenerate good data from redundant bad data.
Here is what this would look like in practice using the example of a single flipped bit near the start of the encrypted file. First age:
$ age -d -i key.txt -o totc_out.txt totc.txt.age
Error: chacha20poly1305: message authentication failed
[ Did age not do what you expected? Could an error be more useful? Tell us: ]
$ ls -l totc_out.txt
-rw-r--r-- 1 operator operator 0 Dec 25 12:53 totc_out.txt
Age has returned a zero length file. Those that have spent time maintaining backups for others might be suffering some vicarious anxiety at this point. A single bit error has nerfed the entire backup. There is no recovery mode or utility available for age which makes the recovery capability provided by your compression utility2) worthless.
The published standard for age 3) is incomplete. I was not able to determine if a recovery utility was even possible as the standard does not provide a description of how the 64KB chunks relate to one another. Creating a recovery utility would be harder due to this lack of documentation.
It is quite common for media problems to result in the loss of one or more media blocks. Since the 64k chunk used by age is likely going to be larger, an age recovery process would require a search for the start of the next chunk.
Now GnuPG:
$ gpg2 -d totc.txt.pgp >totc_out.txt
gpg: encrypted with 2048-bit RSA key, ID B456C3BB5A48A0EA, created 2020-06-01
 "BACKUP "
 gpg: WARNING: encrypted message has been manipulated!
$ ls -l totc_out.txt
-rw-r--r-- 1 operator operator 807615 Dec 25 15:26 totc_out.txt
Here is the damage to the text:
Norway, there were growing trees, wheo tRZQ^Z^\'s^Q.3ACs put to death,
So we have lost 5 words out of 800KB of text4). This is an example of a somewhat unknown and under appreciated feature of the type of encryption used in OpenPGP. It is self-synchronizing in the face of corruption. The "chunk" in this case is only going to be something like 16 bytes which is going to be shorter than the media block so there is no search required to find the next good "chunk". As a result, no recovery mode or utility is required for GnuPG in almost all cases. Recovery is automatic with a provided warning and returned error.
At this point you might want to consider how often longer term backups end up with bad sections. Then consider how many attackers exist with sufficient skill, combined with sufficient knowledge of the organization and content of your backups to do reliable changes. Attackers that are willing to have their efforts revealed after the first attempt. This would seem to be where OpenPGP is superior to age.
File Substitution
Public key encryption has a generic consideration that is quite relevant here. Anyone with access to the public key can easily create a file that will pass any file modification tests … because after all that file has not been modified after creation. You can try to keep the public key secret but a public key design does not guarantee thatthe public key can not be derived from the encrypted material. That guarantee only applies to the secret key. So an attacker can skip the bother of attempting to overcome the authentication and just replace the file with whatever they want.
The traditional fix for this weakness is to cryptographically sign the file … and, once again, age does not do signatures. An age user would need to go through the process of finding a separate signing utility and would have to apply it correctly while using a separate signature file. A GnuPG user would only have to add a -s option while encrypting and would have an integrated signature protected by the encryption. No further effort would be required on the part of the GnuPG user. A good signature message would appear automatically after decryption.
Age should be considered where a simple encryption utility is needed that will not under any circumstances release unauthenticated data. Where that behaviour is undesirable, such as for encrypted backups, something based on OpenPGP would be preferred.
PGP FAN index
The commonly used bzip2 compression utility for example is specifically designed to be recoverable and comes with the bzip2recover command.
GnuPG noticed that I was encrypting text and helpfully compressed it thus eliminating my example. The addition of a --compress-algo none option at encrypt time was required. Almost all backups are separately compressed. GnuPG will not recompress input. So GnuPG still gets credit for good recoverablity for the backup case using default options.
pgpfan/agevspgp.txt · Last modified: 2021/08/01 14:26 by b.walzer


text:
I have the same result:
root@serverX:~# sudo service apache2 status
* Apache is running (pid 2958).
As the others have said, this is the main process ID; any other processes are child processes. If you need information on these, you should install mod_status which allows for ExtendedStatus and pulling all kinds of neat information from Apache.
The details given are:
- The number of worker serving requests
- The number of idle worker
- The status of each worker, the number of requests that worker has performed and the total number of bytes served by the worker (*)
- A total number of accesses and byte count served (*)
- The time the server was started/restarted and the time it has been running for
- Averages giving the number of requests per second, the number of bytes served per second and the average number of bytes per request (*)
- The current percentage CPU used by each worker and in total by Apache (*)
- The current hosts and requests being processed (*)
The lines marked "(*)" are only available if ExtendedStatus is On.

source: openbmb/Ultra-FineWeb


Giving life. Meaning.
Minyan Shelanu returns hundreds of teens and
young adults to a life worth living WATCH OUR VIDEO
It takes a village to save a child. Minyan Shelanu is that village.
Minyan Shelanu was born in response to Lakewood's growing community of disenchanted and troubled teenagers. After dropping out of school, many would deteriorate socially, emotionally and spiritually, engaging in negative behaviors such as substance abuse, promiscuity and crime, sometimes culminating in juvenile detention.
Since inception, Minyan Shelanu has always been about life after the street. As a low-profile yet highly effective synagogue and social center, we have achieved remarkable, lifesaving results. It began as a warm, nonjudgmental haven for those underserved by the rigid community model, and soon turned into a rallying point for troubled teens desperate for a bit of love, a kind word and a surrogate home.
Rabbinical luminaries and crisis professionals have come to revere Minyan Shelanu for the monumental power to save lives. Thanks to the organic connections our members form with our Rav and mentors, our minyan has corrected course for hundreds of kids, setting them on path of Yeshiva, career, marriage and lifelong wellness.
1,271 lives made worth living.
Safety first, at last
Our primary focus is to provide a nonjudgmental, supportive safe haven for on-the-street kids, where they can always feel at home, physically and emotionally.
Gainful activity and laid back recreation is provided, particularly during evening hours, creating informal opportunities for individualized connection.
as it happens
Our model has proved to organically administer guidance and support that eventually weans kids away from emptiness towards meaningful living.
Rabbi Chaim Abadi:Foundations first
A successful real estate developer and ordained Rabbi, Chaim's appeal lies in his unpretentiousness and unconditional love for every person. He feels the pain of these troubled teens, many of which are victims of abuse. His heart is open to them, and they instinctively recognize him as a trustworthy father figure. Chaim is also extraordinarily perceptive to youths' emotional, social and spiritual needs.
Need a safe space?
You need Minyan


text:
Nature Therapy Ireland is delighted to welcome you to Midleton Arts Festival 2021 for a series of events where we will explore the incredible health and wellbeing benefits of spending time in nature.
Never have we been so removed from the natural world. The good news is that even a small amount of time spent in nature can have a positive impact on our physical and mental health and wellbeing.
These events will guide you in exploring your own connection to nature, offer invitations to spark your creativity, create a sense community and hopefully leave you feeling relaxed and inspired to get outdoors. The history, science and current practices of nature connection will be woven throughout leaving you with tools to bring into your own daily life.
These interactive sessions will be accessible and inclusive for everyone. Invitations will be easy to understand and simple to action. Whether you have access to nature imagery, indoor house plants, an urban park, a mountain or woodland, there is no right or wrong way to connect to nature.
Please note that the details of events listed above are provided by the relevant Local Authorities.

source: m-a-p/FineFineWeb


text:
This originally Norman surname of WARNKE was derived from a Germanic personal name composed of the elements WARIN (guard) and HERI (meaning army). The name has two distinct origins, it was a baptismal name 'the son of Warrener' and an occupational name meaning the keeper of the 'warren' a place privileged for the keeping of conies, hares, partridges and pheasants. The name is also spelt WARNE, WERNKE, WARNINCK, WARNKEN, WERTZ, WORLIN, WESSELMAN, WERNJTES and WESSELING, to name but a few. Early records of the name mention Edward WARNE who was recorded in County Devon in the year 1185, and Jervase de WERNE of the County Somerset was recorded in the year 1273. Gervase de WERNE appears during the reign of Edward III (_PHONE_). William WARNES of Yorkshire, was listed in the Yorkshire Poll Tax of 1379. Edward WARNE, of County Gloucestershire, registered at Oxford University in 1607. Hereditary surnames were originally imported from France into England during the Norman Conquest of 1066. In the two centuries or so after the Conquest surnames were acquired by most families of major landholders, and many landed families of lesser importance. There appears to have been a constant trickle of migration into Britain between about the years 1200 and 150O, mostly from France and the Low Countries, with a small number of migrants from Scandinavia, Germany, Italy and the Iberian peninsular, and occasional individuals from further afield. During this period groups of aliens settled in this country as for example, the Germans who from the late 15th century onwards settled in Cumbria to work the metal mines. Immigration during this time had only a small effect on the body of surnames used in Britain. In many cases, the surnames of immigrants were thoroughly Anglicised. The late sixteenth century saw the arrival, mostly in London and the south-coast ports of large numbers of people fleeing from the war regions of France. Robert Browne married Mary WARNES in Canterbury, Kent in the year 1661. Baptised. John, son of Stephen WARNES at St. Columb Major, Cornwall in 1707.
Orders over $90 qualify for Free Shipping within the U.S. (Use coupon code: FREESHIP).


Sign up ×
I have a p4300 SAN storage in my network, I create a volume and assign that to TWO servers, i cant sync data between two volume and any change in one of them dont appear to another, how i can do that?
share|improve this question
2 Answers 2
I imagine you're not using a cluster-aware file system, you're probably using something like FAT, NTFS, ext2/3/4, XFS etc. You'll need to use a cluster file system such as OCFS2, Microsoft Cluster-Services enhanced NTFS, Veritas Storage Foundation, VMFS or others. This is a very basic but all too commonly misunderstood problem for junior storage techs to run into.
share|improve this answer
You can't do this with a normal file system, as Chopper3 has pointed out. Trying to do this will quickly lead to data corruption. What you should do is either use a cluster-aware file system, or use a replication technology to synchronize two separate volumes, each presented to a single server.
share|improve this answer
Your Answer


text:
in cooperation with
The continual process of growth is something which generally escapes our ordinary senses. It is something which can be recognised only over an extended period of time. If a person takes care of a plant, they recognise growth over a period of days or weeks, this application transfers the growth of the plant into a medium which we are always able to interpret, that of an ever changing soundscape.
Through the installation, the growth of the grass generates different electrical pulses similar to heartbeats. The more advanced the growth of the plant, the slower and stronger the pulse develops.
The application consists of three physical layers, the top layer is the growing grass and beneath it the root system, below these is the technology which measures the growth and generates the sound. Over time, and with care and attention, the roots grow more and more, creating a complex root-system. A microcontroller is able to measure the conductivity of the root system, the growing media and the solutions of nutrients which surround them and when coupled with an amplifier, generates clicks and pulses in different frequencies. Care, light, nutrients and water, as well as the sequence of connectivity between the growing elements of the grass are thus responsible for creating the ever changing and growing soundscape.
This prototype tries to compare nature and technology to point out parallels. It allows us to pay attention to things which would seem unimportant or unperceivable to us without such a device.
Fritzing Creator Kit


Best Types of Beefs That You Can Put Your Hands On
2 Mins read
Not many people are aware of the fact that beef are of many kinds and even if they are, most of them do not know what makes some types better than the others. So, whichever of the two categories you come under, this is just the right guide for you. It will take you through the two different kinds of beef that you must try. However, before we take you through the variety, we'd like to let you know a little about the different features that make some sellers better than some others. Have a look!
 1. Feeding Practice
Farm fed animals that are sustained on vegetarian diet make the best livestock for the meat industry. Only a few sellers like Papa Earth follow this practice of letting animals feed and live in their natural habitat so that they are healthy.
 1. Growth Factor
Products that come from animals that are given hormones and antibiotics for growth are the ones that you should strictly avoid. Instead, the products that come from animals that are allowed to breed and live naturally and sustained on grass (pesticide free soil) are the ones that you should buy.
 1. Quality Control
Now, did you know that all meats in the market do not come from brands that are quality monitored by the Canadian food authority? Which is why you should buy products from sellers like Papa Earth since each and every product they supply is checked by the food authority of Canada.
That said, now let's take you through the 2 types of beef that you must try.
 1. AAA Beef – This beef comes from Black Angus and is one of the most flavoursome meats you will ever taste. One of the things about AAA beef from Papa Earth is that it is Certified Angus Beef ®. The difference between Angus beef and certified Angus beef is that the latter goes through 10 quality tests. Only when it passes all tests that it becomes certified.
 2. Grass Fed and Grass Finished Beef – This one comes from pigs, cattle, and sheep. The animals are fed on crops like sorghum, oats and peas, hay, and so on. Special precautions are taken so that the animals are neither overfed nor underfed.
You must also have a look at the Paper Earth website to explore more details. Another factor that makes these online sellers better than others is that they offer Papa Earth butcherbox of different sizes so that everybody can afford their products. The three different sizes they offer include:
 - Small box worth 125 dollars.
 - Medium box worth 249 dollars.
 - Large box worth 498 dollars.
So, if it's high-quality beef that you're looking for, Papa Earth is the one seller that you can trust blindly.


Full Text
fred dretske
Subject Philosophy » Epistemology
DOI: 10.1111/b.9780631192589.1993.x
There are various ways of classifying mental activities and states. One useful distinction is that between the propositional attitudes and everything else. A propositional attitude is one whose description takes a sentence as complement of the verb. Belief is a propositional attitude: one believes (truly or falsely as the case may be) that there are cookies in the jar. That there are cookies in the jar is the proposition expressed by the sentence following the verb. Knowing, judging, inferring, concluding and doubting are also propositional attitudes: one knows, judges, infers, concludes or doubts that a certain proposition (the one expressed by the sentential complement) is true. Though the propositions are not always explicit, hope, fear, expectation, intention and a great many other terms are also (usually) taken to describe propositional attitudes: one hopes that (is afraid that, etc.) there are cookies in the jar. Wanting a cookie is, or can be construed as, a propositional attitude: wanting that one have (or eat or whatever) a cookie. Intending to eat a cookie is intending that one will eat a cookie. Propositional attitudes involve the possession and use of concepts and are, in this sense, representational. One must have some knowledge or understanding of what Xs are in order to think, believe or hope that something is X. In order to want a cookie, intend to eat... log in or subscribe to read full text
Log In
You are not currently logged-in to Blackwell Reference Online
 Forgotten your password?
Find out how to subscribe.
Blackwell Publishing Home Page
Blackwell Reference Online ® is a Blackwell Publishing Inc. registered trademark
Technology partner: Semantico Ltd.
Back to Top


text:
The Type 1 solar array drive assembly offers a minimum weight, minimum power solution for positioning solar array panels at the lower end of the size/power spectrum. It is based on the Moog Type 1 rotary incremental actuator. Continuous rotation of the solar array is facilitated by the integration of a slip ring assembly on the output of the actuator, and the rear accessory section of the Type 1 actuator is available for a position feedback device-potentiometer or encoder. Selecting the qualified unit in its existing configuration will have cost and schedule benefits. However, as with all Moog designs, the slip ring assembly is modular. Substitutions and modifications to meet mission requirements are easily implemented. Integration of the actuator with another similar Type 1 actuator will produce a Type 11 biaxial SADA. Typical Type 1 performance specifications are shown in the table below. The unit is driven by the standard Moog Electronic Control Unit.
Moog is a proven leader in components, subsystems, and systems for spacecraft of all sizes, from smallsats to GEO spacecraft. Moog has been successfully providing spacecraft controls, inspace propulsion, and major subsystems for science, military, and commercial operations for more than 60 years.


text:
In February I facilitated an amphibian Conservation Needs Assessment workshop for Guatemalan species, at the Museum of the University of San Carlos in Guatemala City. Participants at the workshop were Carlos Vasquez, Jonathan Campbell (Guatemalan Regional Chair of the IUCN/SSC Amphibian Specialist Group), Ted Papenfuss, Manuel Acevedo, Roderico Anzueto, Liza García, Jacobo Conde, Alejandra Zamora and Gustavo Ruano.
During the workshop, 142 Guatemalan species were evaluated by the participants to assess actions that are required to ensure their survival, with species falling into one or more of six different conservation roles:
- 34 species requiring rescue – Species that are in imminent danger of extinction (locally or globally) and requires ex situ management, as part of an integrated program, to ensure their survival.
- 42 species requiring in situ conservation – Species for which mitigation of threats in the wild may still bring about their successful conservation.
- 58 species requiring in situ research – Species that for one or more reasons require further in situ research to be carried out as part of the conservation action for the species. One or more critical pieces of information is not known at this time.
- 12 species requiring ex situ research – Species undergoing specific applied research that directly contributes to the conservation of the species, or a related species, in the wild (this would include clearly defined 'model' or 'surrogate' species).
- 12 species suited to conservation education – Species that are specifically selected for management – primarily in zoos and aquariums – to inspire and increase knowledge in visitors, in order to promote positive behavioural change. For example, when a species is used to raise financial or other support for field conservation projects (this would include clearly defined 'flagship' or 'ambassador' species).
- 37 species which do not currently require conservation action
At the end of the workshop, participants discussed the results, and the next steps that are required. Further in situ research work is currently underway, with a number of universities currently involved in field research. Interest is high in holding an amphibian husbandry workshop in Guatemala over the coming months to increase the in-country capacity to establish successful ex situ conservation programs.
A proposal is currently being drafted to seek support for a small amphibian conservation breeding and display facility, with display facilities for one or two common frog and salamander species, and an off-display area where husbandry skills can be increased, and several species can be established for captive breeding.
Funds for the workshop were generously provided by the Columbus Zoo and Aquarium Conservation Fund, and we are grateful for their support for this workshop.
The detailed results from the workshop can be found on the Amphibian Ark's data portal.

source: HuggingFaceFW/fineweb-edu


type: QgsProcessingParameterFeatureSink
## Accepted data types:
## - str: destination vector file
## e.g. d:/test.shp
## - str: memory: to store result in temporary memory layer
## - str: using vector provider ID prefix and destination URI
## e.g. postgres:… to store result in PostGIS table
## - QgsProcessingOutputLayerDefinition
## - QgsProperty
## Outputs
## OUTPUT:
## Vertices
In our case the tool to extract the vertices is simple and only has one input and one output. The function run_qgis() executes a QGIS tool indicating the algorithm and its arguments. The advantage of using the algorithm directly from R is that we can pass objects of class sf (or sp) and raster that we have imported or created in R. As output we create a geojson, it could also be of another vector format, and we save it in a temporary folder. At the same time we indicate to import the result directly into R (load_output = TRUE).
river_vertices <- run_qgis(alg = "native:extractvertices",
 INPUT = river_line,
 OUTPUT = file.path(tempdir(), "rivers_world_vertices.geojson"),
 load_output = TRUE)
## [1] "C:/Users/xeo19/AppData/Local/Temp/Rtmpa4DrCj/rivers_world_vertices.geojson"
Currently on Windows there seem to be problems with the proj library. In principle, if the function ends up creating the river_vertices object, you should not worry. Otherwise, I recommend looking at the discussion in the issue opened at gitbub.
Before continuing with the distribution estimation of the angles, we filter some rivers of interest. The functions of the tidyverse collection are compatible with the sf package. In the last post I made an introduction to tidyverse here.
river_vertices <- filter(river_vertices,
 NAME %in% c("Mississippi", "Colorado",
 "Amazon", "Nile", "Orange",
 "Ganges", "Yangtze", "Danube",
 "Mackenzie", "Lena", "Murray",
## Simple feature collection with 94702 features and 11 fields
## geometry type: POINT
## dimension: XY
## bbox: xmin: -_PHONE_ ymin: -_PHONE_ xmax: _PHONE_ ymax: _PHONE_
## geographic CRS: WGS 84
## Warning in st_is_longlat(x): bounding box has potentially an invalid value range
## for longlat data
## for longlat data
## # A tibble: 94,702 x 12
## NAME SYSTEM name_alt scalerank rivernum Length_km vertex_index vertex_part
## *
## 1 Nile 1 4 3344. 0 0
## 2 Nile 1 4 3344. 1 0
## 3 Nile 1 4 3344. 2 0
## 4 Nile 1 4 3344. 3 0
## 5 Nile 1 4 3344. 4 0
## 6 Nile 1 4 3344. 5 0
## 7 Nile 1 4 3344. 6 0
## 8 Nile 1 4 3344. 7 0
## 9 Nile 1 4 3344. 8 0
## 10 Nile 1 4 3344. 9 0
## #... with 94,692 more rows, and 4 more variables: vertex_part_index,
## # distance, angle, geometry
Estimate the distribution
To visualize the distribution we can use either a histogram or a density graph. But in the case of estimating the probability density function, we find a mathematical problem when applying it to circular data. For circular data we should not use the density() standard function of R since in our data a direction of 360º is the same at 0º, which would cause errors in this range of values. It is a general problem for different statistical metrics. More statistical details are explained in the circular package. This package allows you to define the characteristics of circular data (unit, data type, rotation, etc.) as an object class in R.
So what we do is to build a function that estimates the density and returns a table with the angles (x) and the density estimates (y). Since rivers have different lengths, and we want to see differences regardless of that, we normalize the estimates using the maximum value. Unlike the density() function, in which the smoothing bandwidth bw is optimized, here it is required to indicate it manually. It is similar to defining the bar width in a histogram.
dens_circ <- function(x){
 dens <- density.circular(circular(x$angle, units = "degrees"),
 bw = 70, kernel = "vonmises",
 control.circular = list(units = "degrees"))
 df <- data.frame(x = dens$x, y = dens$y/max(dens$y))
Finally, we estimate the density of each river in our selection. We use the split() function of R Base to get a table of each river in a list object. Then we apply our density estimation function to the list with the function map_df() from the purrr package. The suffix _df allows us to get a joined table, instead of a list with the results of each river. However, it is necessary to indicate the name of the column with the argument.id, which will contain the name of each river. Otherwise we would not know how to differentiate the results. Also here I recommend reading more details in the last post about tidyverse here.
dens_river <- split(river_vertices, river_vertices$NAME) %>%
 map_df(dens_circ,.id = "river")
# results
## river x y
## 1 Amazon 0.000000 0._PHONE_
## 2 Amazon 0.704501 0._PHONE_
## 3 Amazon 1.409002 0._PHONE_
## 4 Amazon 2.113503 0._PHONE_
## 5 Amazon 2.818004 0._PHONE_
## 6 Amazon 3.522505 0._PHONE_
Now we only have to make the graph through the famous ggplot package. First we add a new font Montserrat for it use in this plot.
# font download
font_add_google("Montserrat", "Montserrat")
# use of showtext
showtext_opts(dpi = 200)
In the next step we create two objects with the title and the plot caption. In the title we are using an html code to color part of the text instead of a legend. You can use html very easily with the ggtext package.
# title with html
title <- "Relative distribution of river flow direction in the world"
caption <- "Based on data from Zeenatul Basher, 20180215"
The background grid that creates ggplot by default for polar coordinates did not convince me, so we create a table with x axis background lines.
grid_x <- tibble(x = seq(0, 360 - 22.5, by = 22.5),
 y = rep(0, 16),
 xend = seq(0, 360 - 22.5, by = 22.5),
 yend = rep(Inf, 16))
Next we define all the styles of the graph. The most important thing in this step is the element_textbox() function of the ggtext package to be able to interpret our html code incorporated into the title.
theme_polar <- theme_minimal() +
 theme(axis.title.y = element_blank(),
 axis.text.y = element_blank(),
 legend.title = element_blank(),
 plot.title = element_textbox(family = "Montserrat",
 hjust = 0.5,
 colour = "white",
 size = 15),
 plot.caption = element_text(family = "Montserrat",
 colour = "white"),
 axis.text.x = element_text(family = "Montserrat",
 colour = "white"),
 strip.text = element_text(family = "Montserrat",
 colour = "white",
 face = "bold"),
 panel.background = element_rect(fill = "black"),
 plot.background = element_rect(fill = "black"),
 panel.grid = element_blank()
Finally we build the graph: 1) We use the geom_hline() function with different y intersection points to create the background grid. The geom_segment() function creates the x grid. 2) We create the density area using the geom_area() function. 3) In scale_x_continous() we define a negative lower limit so that it does not collapse at a small point. The labels of the eight main directions are indicated in the scale_y_continous() function, and 4) Finally, we change to a polar coordinate system and set the variable to create facets.
ggplot() +
 geom_hline(yintercept = c(0,.2,.6,.8,


text:
(Vizsla Dog Breed Story at Dog Grooming!)
Vizsla Dog Breed Story at Dog Grooming-The Vizsla is a Hungarian breed with a lengthy history. They were esteemed and adaptable hunters, known for their pointing and retrieving abilities. They are now well-known as affectionate, attractive, and energetic companions.
Is a Vizsla a good family dog?
Personality of the Vizsla…. Vizslas are generally regarded as kind, joyful, vivacious, loving, sociable, and clever dogs who make excellent family companions. They want constant human interaction and, as previously said, might develop separation anxiety if left alone for lengthy periods of time.
Related article: (German Shorthaired Pointer Dog Breed Story at Dog Grooming!)
What are the characteristics of a Vizsla dog?
Vizslas are regarded as bright, kind, and loving dogs with above-average learning abilities and a great desire to be around people. Although he is recognised for being biddable, some Vizslas may be obstinate, hyperactive, or timid.
What is the value of a Vizsla puppy?
A Vizsla puppy from a breeder costs around $1,000 on average. The majority of pups cost between $500 and $1,700. However, you can get pups for a lot more money.
What is the maximum amount of time I may leave my Vizsla alone?
We all adjust and meet the dogs' demands, as well as love and feed them well. If you are consistent in your training and exercising your dog in the mornings and nights, any dog can tolerate being alone for a work day. Vizslas are no exception. My dog is perfectly capable of staying at home alone for 8-10 hours.
Is it possible to keep a Vizsla in an apartment?
So, how do Vizslas fare as apartment dogs? Yes, most dogs can be fine apartment dogs if the owner has the resources to care for the dog's requirements, according to Urban Dog. Vizslas, as we've mentioned several times in this post, require a lot of cerebral stimulation and activity. They flourish in their owner's company as well.
The Vizsla has a long and illustrious history. Their origins are said to be as far back as the eighth century. The Magyar clans in Hungary were created about this period, and they required canines with stamina, speed, athleticism, and courage to help them with their hunts. As a result, they are also known as the Magyar or Hungarian Vizsla.
There's even a piece of artwork from the 10th century that depicts a Magyar tribesman, his falcon, and a dog that looks a lot like a Vizsla.
These canines were valued belongings of Hungarian noblemen as the ages passed. They proceeded to improve the breed's hunting abilities and disposition, resulting in the modern-day Vizsla that has captured the hearts of many.
Vizsla populations had plummeted by the late nineteenth century, and they were on the point of extinction. Because of the commitment of breed lovers, it was able to avoid this destiny, and its popularity has since grown again.
The first Vizslas came in the United States in the mid-twentieth century, and they were recognised by the American Kennel Club (AKC) in 1960. They are still a popular breed in North America and Europe today.
How to Care:
The Vizsla is a breed that is known for being flexible, loving, and energetic. They are ideally suited to a busy household with an active outdoor lifestyle. They have a lot of energy, and if they don't receive enough daily exercise and stimulation, they can easily get bored and disruptive at home.
They are known to be good chewers, so provide them with plenty of safe and interesting toys to play with.
They are superb agility dogs and thrive at competitive sports. They do well in scent work trials because to their hunting pointing and retrieve skills, and they are frequently wonderful water lovers. They are noted for their agility and stamina, and they like running. If you appreciate the sport of Canicross, this makes them a popular pick (running with your dog).
Vizslas are bright dogs who want to please their owners. It's critical to provide kids with adequate mental activity to keep troublesome behaviours at bay. They react well to positive dog training methods and, with the appropriate direction, rapidly pick up commands and training cues.
They have a deep relationship with their family members and are quite companionable. They are often sociable with people and other dogs and flourish in groups.
This does imply that if they are left alone too much, they may develop separation anxiety, and they are best suited to a family where someone will be there for the majority of the day.
They are a vocal breed with a proclivity for alert barking, howling, and other vocalisations. You must be careful not to unintentionally reward these behaviours, since this might lead to a problem. To keep their barking under control, always thank them for being silent and ask for an alternate behaviour.
Vizslas do not have a high grooming need. They have a short coat that just has to be brushed once a week to remove dead hair and keep it in good shape. They're also not renowned for shedding excessively.
Vizslas have a reputation for being a healthy breed. They do have some health issues to which they may be genetically prone.
You may lessen the dangers by finding a reputable breeder that does health tests on prospective parents, but some of the diseases they are known for include:
Vizslas are more susceptible to epilepsy-related seizures than the typical dog breed. This is an area where study is underway. Meanwhile, while there is presently no treatment, it is comforting to know that, while there is no cure, it is a condition that can frequently be adequately controlled with medicine and lifestyle changes.
Auto-Immune Illnesses: Vizslas have also been shown to be more susceptible to auto-immune diseases. Seasonal and dietary allergies are becoming more frequent. Vizsla Inflammatory Polymyopathy is a breed-specific illness that is currently being investigated. Muscle atrophy around the head, swallowing difficulties, and excessive drooling are all possible symptoms. The prognosis is usually excellent if this is detected early enough, since it may be treated with immune suppressant medicines.
Hip dysplasia is a condition that affects numerous breeds. It has something to do with the aberrant development of one or both hip joints. It's typically a progressive disorder, and surgery may be necessary in extreme cases to help preserve a high quality of life.
Diet and Nutrition:
Your Vizsla, like any other dog, should be fed a high-quality, portion-controlled diet.
Because of their deep chests, Vizslas are more susceptible to the life-threatening illness known as bloat.
It is suggested that you feed them at least twice a day rather than one heavy meal to help reduce the risk of this happening. Encourage them to eat more slowly using a slow feeder or interactive treat toy if they are prone to gulping down their food.


text:
Please note that the recommended version of Scilab is 2024.0.0. This page might be outdated.
However, this page did not exist in the previous stable version.
set scales for isometric plot (change the size of the window)
square(xmin, ymin, xmax, ymax)
- xmin, xmax, ymin, ymax
four real values.
square is used to have isometric scales on the x
and y axes. The requested values
ymax are the boundaries of the graphics frame
square changes the graphics window
dimensions in order to have an isometric plot.
square sets the current graphics scales
and can be used in conjunction with graphics routines which request
the current graphics scale (for instance
|Report an issue


text:
By Vaudine England
BBC News, Hong Kong
A study by doctors in Hong Kong has concluded that epilepsy can be induced by the Chinese tile game of mahjong.
The study said the syndrome affects more men than women
The findings, published in the Hong Kong Medical Journal, were based on 23 cases of people who suffered mahjong-induced seizures.
The report's four authors, from Hong Kong's Queen Mary Hospital, said the best prevention - and cure - was to avoid playing mahjong.
The study led the doctors to define mahjong epilepsy as a unique syndrome.
Epileptic seizures can be provoked by a wide variety of triggers, but one cause increasingly evident to researchers is the playing - or even watching - of mahjong.
This Chinese tile game, played by four people round a table, can involve gambling and quickly becomes compulsive.
The game, which is intensely social and sometimes played in crowded mahjong parlours, involves the rapid movement of tiles in marathon sessions.
The doctors conclude that the syndrome affects far more men than women; that their average age is 54; and that it can hit sufferers anywhere between one to 11 hours into a mahjong game.
They say the attacks were not just caused by sleep deprivation or gambling stress.
Mahjong is cognitively demanding, drawing on memory, fast calculations, concentration, reasoning and sequencing.
The distinctive design of mahjong tiles, and the sound of the tiles crashing onto the table, may contribute to the syndrome.
The propensity of Chinese people to play mahjong also deserves further study, the doctors say.
What is certain though, is that the only sure way to avoid mahjong epilepsy, is to avoid mahjong, which for many people is easier said than done.


Remote read replicas - the what, why, and how
PostgreSQL remote read replicas enable users to increase their data availability, as well as read and write performance. Read more to learn how Aiven does it.
03 April 2018
Prem Nallasivampillai
Prem Nallasivampillai RSS Feed
Head of Customer Success at Aiven
Glossary of terms Master: The primary DB instance that is the target of write (and read) operations.
Standby: A DB instance that will be considered for promotion (available for reads).
Read replica: Implies local or remote read-only instance (a.k.a replica).
What is an Aiven for PostgreSQL remote read replica?
When it comes to Aiven for PostgreSQL, until remote replica functionality was released a few weeks ago, there were traditionally two types of DB instances namely, Master, and one or more Standby instances. Each standby instance serves two purposes: the first is to be considered for promotion in the event the master fails, and the other is to serve read-only operations.
Standalone read replica is the newest member to this family. The differences between a standby instance and a remote read replica are that, a remote read replica will never be considered for promotion if the master failed, and a standby is always located in the same region as the master.
As with all flavors of standby and read replica instances (local or remote), the mechanism used to replicate data from the master to the replicas is asynchronous. By not relying on network service quality & bandwidth coupled with the low overhead inherent in PostgreSQL streaming replication, the impact to the write and read performance of the Master DB instance is negligible.
Note: A remote read replica can be set up between homogenous or heterogenous cloud providers. For example, you can have your primary service in Google Cloud (Iowa) and have a read replica in DigitalOcean (New York) or Google Cloud (South Carolina).
Why remote read replicas are a business imperative
At this point, you might be wondering what the big deal is about the new addition. The two most fundamental uses of the remote read replica are to provide greater data availability, and increased performance (throughput and latency) for reads and writes. By offloading reads to the replica, you are essentially doing two things:
1. increase read throughput (fairly obvious), and
2. increase write throughput on the master (not so obvious).
To illustrate, let's say that you have a business-critical application that records online merchandise purchases. In order to record and fulfill those orders you have invested in one of the premium Aiven PostgreSQL plans equipped with a read/write Master and two standby instances, where all the DB instances are located in the same region.
What would happen if the region your Aiven service is running in goes black, as would happen with a natural disaster?. You are then in a situation where you can neither view existing orders, let alone fulfill them. Nor can you record any new orders that your customers want to make from your website. As your sales are impacted, so is your bottom line.
If you were taking advantage of remote read replica functionality, your day would have gone a lot better. Because, the remote read replica will remain fully operational for reads even if the primary region hosting your Master and local replicas becomes inoperable. Therefore, you can continue to fulfill existing orders that were already made.
You can even tweak it so that you can convert the remote read replica to a read/write Master and point your web application to it within a matter of a few minutes, thereby allowing you to continue accepting new orders. In short, a remote read replica provides greater data availability for your business-critical applications.
And availability is just the most obvious benefit of remote read replicas; there are also performance benefits. Especially in the age of globalization, it makes sense to place the data close to consumers. In this case, there may be data that various regional departments share. By allowing for the placement of data close to consumers, a remote read replica makes it more efficient to access.
A similar use case is where massive amounts of data are used in various regions to generate daily performance reports and analytics. Again, replicating and placing this data closest to the regions where the reports and analytics are run for decision makers enables them to make more timely decisions based upon the data. Aiven for PostgreSQL remote read replica feature makes this possible.
How to set up a read replica in 7 steps
Setting up a remote read replica is made convenient through the Aiven Console. Please follow the instructions below to setup a remote read replica for any non-hobbyist Aiven for PostgreSQL plan.
1. Navigate to the Aiven console.
Note: If you don't have a PostgreSQL service running, create a Startup or higher Aiven PostgreSQL service from the Aiven console per Getting started with Aiven PostgreSQL.
existing postgresql service
2. Once your PostgreSQL service up and running, navigate to the service details page by clicking on the service name.
postgreSQL service details]
3. Click on the "Create a read replica" button shown in the bottom-right corner to get to the new remote read replica configuration screen.
postgreSQL service details]
4. Give the remote read replica service a name.
5. Select the Cloud provider who will be hosting the remote read replica service (and the region).
6. Select a plan for the service (default: same plan as the main service).
7. Click "Create" to provision the remote read replica service. Give the service a few minutes to complete startup.
postgreSQL service details
Note: To obtain the credentials to access the remote read replica, simply click on its service name to enter the service details page.
remote-replica service details]
Create your first read replicas today
If you have a business-critical application that requires data (and associated service) to survive complete failure of a cloud provider's region or wish to increase the performance of your existing Aiven PostgreSQL database, take advantage of the Aiven PostgreSQL remote read replica functionality. The cost is will be nominal compared to benefits and peace of mind it will bring.
Stay up-to-date! Follow us on Facebook and [Twitter](, or join the Aiven blog's RSS feed_
Start your free 30 day trial
Aiven logo
Let's connect


text:
Category:History of Manchuria
From Infogalactic: the planetary knowledge core
|Wikimedia Commons has media related to History of Manchuria.|
This category has the following 5 subcategories, out of 5 total.
Pages in category "History of Manchuria"
The following 87 pages are in this category, out of 87 total.
- Battle of Shaho
- Battle of Shanhai Pass
- Siege of Changchun
- Siege of Port Arthur
- Sino-Russian border conflicts
- Sino-Soviet border conflict
- Sino-Soviet conflict (1929)
- South Manchuria Railway
- South Manchuria Railway Zone
- Soviet invasion of Manchuria
- Soviet–Japanese border conflicts
- Soviet–Japanese Neutrality Pact
- Soviet–Japanese War (1945)


- reflective coating with a second type of chemical dopant different than the first type of chemical dopant, wherein the second type of chemical dopant defines a greater volume within the anti-reflective coating than the first type of chemical dopant further strengthening the anti-reflective coating.
21. The method of claim 20, further comprising:
annealing the anti-reflective coating prior to replacing at least the portion of the first type of chemical dopant within the anti-reflective coating with a second type of chemical dopant, wherein the annealing repairs damage caused by entry of the first type of chemical dopant into the anti-reflective coating.
22. The method as in any one of claims 20 and 21, wherein the annealing assists bonding of the first type of chemical dopant to the anti-reflective coating.
23. The method as in any one of claims 20 and 21, further comprising:
annealing the anti-reflective coating after replacing at least the portion of the first type of chemical dopant within the anti-reflective coating with a second type of chemical dopant, wherein the annealing repairs damage caused by entry of the second type of chemical dopant into the anti-reflective coating.
24. The method as in any one of claims 20 and 21, wherein the first type of chemical dopant includes sodium and the second type of chemical dopant includes potassium.
25. The method as in any one of claims 20 and 21, wherein depositing a first type of chemical dopant into the anti-reflective coating comprises:
exposing the anti-reflective coating to a fluid containing the first type of chemical dopant.
26. The method as in any one of claims 20 and 21, wherein depositing a first type of chemical dopant into the anti-reflective coating comprises:
enriching at least a portion of a substrate with the first type of chemical dopant, the substrate including a surface, wherein the enriched portion includes the surface; and
depositing the anti-reflective coating on the surface of the substrate such that the first type of chemical dopant diffuses into the anti-reflective coating.
27. The method as in any one of claims 20 and 21, wherein replacing at least the portion of the first type of chemical dopant within the anti-reflective coating with a second type of chemical dopant:
exposing the anti-reflective coating having the first type of chemical dopant deposited therein to a fluid containing the second type of chemical dopant.
28. The method as in any one of claims 20 and 21, further comprising:
depositing the anti-reflective coating onto a substrate.
29. The method of claim 28, further comprising:
strengthening the substrate by incorporating at least one of the first type of chemical dopant and the second type of chemical dopant into the substrate.
30. The method of claim 29, wherein the substrate is strengthening prior to depositing the anti-reflective coating onto a substrate.
31. The method of claim 29, wherein the substrate is strengthening after depositing the anti-reflective coating onto a substrate.
32. The method of claim 29, wherein strengthening the substrate comprises: depositing the first type of chemical dopant into the substrate; and replacing at least a portion of the first type of chemical dopant within the substrate with the second type of chemical dopant.
33. The method of claim 32, wherein the second type of chemical dopant defines a greater volume within the substrate than the first type of chemical dopant.
34. The method of claim 32, wherein replacing at least the portion of the first type of chemical dopant within the substrate with the second type of chemical dopant increases a compressive stress within the substrate.
35. The method of as in any one of claims 20 and 21, wherein the anti-reflective coating is applied to a display screen of an electronic device.
36. The method as in any one of claims 20 and 21, wherein the anti-reflective coating includes a plurality of layers, wherein the first type of chemical dopant and the second type of chemical dopant enter into at least one of the plurality of layers.
37. An electronic device, comprising:
a display configured to output a graphical image; and
a protective assembly covering the display, the protective assembly comprising:
a substrate; and
a film coupled to the substrate,
wherein the film comprises a chemical dopant that increases a compressive stress of the film causing the film to be strengthened and preventing cracking of the film.
38. The electronic device of claim 37, wherein the film comprises an anti- reflective coating that is substantially transparent to visible light and configured to reduce optical reflection of light incident a surface of the anti-reflective coating.
39. The electronic device as in any one of claims 37 and 38, wherein the chemical dopant includes at least one of sodium and potassium.
40. The electronic device as in any one of claims 37 and 38, wherein the substrate comprises the chemical dopant strengthening the substrate.
41. The electronic device of claim 40, wherein the chemical dopant includes at least one of sodium and potassium.
42. The electronic device as in any one of claims 37 and 38, wherein the chemical dopant is a first type of chemical dopant, wherein the substrate comprises a second type of chemical dopant different than the first type of chemical dopant.
43. The electronic device of claim 42, wherein the second type of chemical dopant includes at least one of sodium and potassium.
44. The electronic device as in any one of claims 37 and 38, wherein the substrate comprises silicon dioxide.
45. The electronic device of claim 44, wherein the substrate further comprises at least one of aluminum, magnesium and sodium.
46. A display assembly, comprising:
a display configured to output an image to a user;
a substrate layer configured to protect the display, the substrate layer being substantially transparent to visible light allowing viewing of the display; and
an anti-reflective coating disposed on and configured to reduce optical reflection of light incident the display assembly, the anti-reflective coating comprising a plurality of dopant species incorporated therein strengthening the anti- reflective coating and preventing cracking of the anti-reflective coating.
47. The display assembly of claim 46, wherein the plurality of dopant species includes at least one of sodium and potassium.
48. The display assembly as in any one of claims 46 and 47, wherein the substrate layer comprises a second plurality of dopant species that strengthens the substrate layer.
49. The display assembly of claim 48, wherein the second plurality of dopant species includes at least one of sodium and potassium.
50. The display assembly as in any one of claims 46 and 47, wherein the dopant species is a first type of dopant species, wherein the substrate layer comprises a second type of dopant species different than the first type of dopant species.
51. The display assembly of claim 42, wherein the second type of dopant species includes at least one of sodium and potassium.
52. The display assembly as in any one of claims 46 and 47, wherein the anti- reflective coating is comprised of at least one of silicon dioxide, silicon nitride, titanium oxide, tantalum pentoxide, and tantalum oxide.
53. The display assembly as in any one of claims 46 and 47, wherein the anti- reflective coating includes a plurality of layers, wherein the plurality of dopant species is incorporated into at least one of the plurality of layers.
54. A computer program product comprising at least one computer-readable storage medium having computer-executable program code portions stored therein, the computer-executable program code portions comprising:
program code instructions for depositing a first type of chemical dopant into a anti-reflective coating strengthening the anti-reflective coating, the anti-reflective coating being substantially transparent to visible light and configured to reduce optical reflection of light incident a surface of the anti-reflective coating; and
program code instructions for replacing at least a portion of the first type of chemical dopant within the anti-reflective coating with a second type of chemical dopant different than the first type of chemical dopant, wherein the second type of chemical dopant defines a greater volume within the anti-reflective coating than the first type of chemical dopant further strengthening the anti-reflective coating.
55. The computer program product of claim 54, wherein the first type of chemical dopant includes sodium and the second type of chemical dopant includes potassium.
56. The computer program product as in any one of claims 54 and 55, further comprising program code instructions for coupling the anti-reflective coating to a substrate.
57. The computer program product of claim 56, further comprising program code instructions for strengthening the substrate.
58. The computer program product of claim 57, wherein the program code instructions for strengthening the substrate comprise program code instructions for strengthening the substrate substantially simultaneously with replacing at least the portion of the first type of chemical dopant within the anti-reflective coating with the second type of chemical dopant.
59. The computer program product of claim 57, wherein the program code instructions for strengthening the substrate comprise program code instructions for strengthening the substrate after replacing at least the portion of the first type of chemical dopant within the anti-reflective coating with the second type of chemical dopant.
60. The computer program product as in any one of claims 54 and 55, further comprising program code instructions for annealing the anti-reflective coating prior to replacing at least the portion of the first type of chemical dopant within the anti- reflective coating with the second type of chemical dopant.
PCT/US2014/_PHONE_-25 2014-


On one of the projects we are working on, there was a need to integrate with Vantive (aka Peoplesoft), which was to be done by using a connector to access the CRM's Oracle database. All fine and good.
However, we did ran into a nasty issue: Attachments. As it turns out, Vantive allows the users to attach documents (say, a word document or an excel spreadsheet) to things like service orders. As part of the integration process we were building, we needed to grab the file location (path) of the file that had been attached and send it as part of a message to another application. So we had to dive into Vantive, only to find that the SW_ATTACHMENT table contained the links and attachments, allright, but not in the way we expected it.
The problem is, what Vantive stores in the table is not just the original path to the file, since it also allows the user to embed the actual document besides just linking to it. As it turns out, what Vantive actually stores is a BLOB containing an OLE Structured Storage file (and using one of the older OLE formats as a Compound File I believe).
We spent some days breaking up the BLOBS to see how we could manipulate them, and finally ended up doing something like this yesterday, which works, sort of:
 - Extract the BLOB from the database and save it to a temporary file
 - Use StgOpenStorage() to crack it open and get a reference to IStorage to manipulate it
 - Look for a stream called "\x1Ole10Native" within the storage, and then open it using IStorage::OpenStream()
 - Read the contents of the stream into a buffer, and then look for the byte sequence {0x01 0x00 0x01 0x00}. If we find it, then just after it we can read the rest of the stream as an UTF-7 encoded string. This is the path to the linked file.
In all honesty, this sounds like a fairly brutal hack, but it does the trick for now and only took a few hours to discover :). The problem mostly is that we are not very familiar with structured storage of exactly how Vantive packed the data in it, so, if anyone has any tips that could helps us clean up the code (like what the significance of the "\x1Ole10Native" stream is, or what the format of it is), I'd appreciate it.
Tomas Restrepo
Software developer located in Colombia.


Quadcopter vs Hexacopter
Quadcopter vs Hexacopter
If you're looking for a hexacopter, you have to ensure a few things. You should know the advantages of a hexacopter as compared to a quadcopter. Make sure that which drone will meet your needs effectively. In this article, we will discuss which is better: quadcopter vs hexacopter.
We will compare both drones, which will make it easy for you.
quadcopter vs hexacopter
What is a quadcopter?
A drone has four rotors that help it fly in the air and hover for a long time. A quadcopter is a remote-controlled UAV ( Unmanned Aircraft Vehicle) mainly used for videography.
What is a Hexacopter?
A hexacopter consists of six rotors and six motors that help fly in the air. It's also a UAV controlled by a remote.
Use of Quadcopter
Quadcopter mostly for videography and photography. These drones are mostly compact in size and low in weight. One disadvantage of quadcopters is they can't lift an additional payload
Use of quadcopter
Use of Hexacopter
Hexacopter is used in high-level cinematography. The Main is they can lift larger cameras which use for films. These UAVs are available in all sizes.
Pros and Cons Of Quadcopter vs Hexacopter
Hexacopter are different from quadcopters in many ways which we will discuss now.
Payload Capacity
Hexacopter can lift heavy weights as compared to quadcopters. This is the reason they can be seen in industries like agriculture, professional cinematography and surveying
Flight Duration
Now quadcopters have an edge over hexacopters. They don't offer any additional flight time due to larger weights. They need more power to lift heavy weights.
Sizes
One more benefit of quadcopters is that they are compact compared to helicopters. The quadcopter can be foldable as well.
Motor Dependent
Hexacopter has six motors, if the motor fails, the aircraft will be stable to maintain elevation and land safely. On the hand, quadcopters have four motors. If one of them fails drone will crash.
Quadcopter vs Hexacopter
Expensive
Hexacopters are more expensive because of their design and additional functions. These UAVs mostly use in industries and need to be good in quality. That's why they are expensive
Which one is more stable
Since hexacopter have motors in a circular pattern compared to quadcopters, changing direction is more stable and work will be done more effectively.
Conclusion
Hexacopters are mostly used in industries and for professional work. If you're new to drones, you should go with a quadcopter that helps you learn skills. Quadcopters are very much cheaper.
Quadcopters are most commonly used for videography. A quadcopter is best if you're looking for a drone for videography.
FAQs
Is a hexacopter better than a quadcopter?
Hexacopter can lift heavy weights, providing more stable flight than quadcopters. If one of the motors fails, the hexacopter can maintain its balance and land safely.
What are Hexacopter drones used for?
Hexacopters mostly used for
Film videography
Agriculture industries
Surveying purposes and other fields require heavy weight lifting.
Similar Posts
Leave a Reply
Your email address will not be published. Required fields are marked *


DEV Community
Cover image for Building a REST API in Play Framework
pazvanti
pazvanti
Posted on • Updated on

Building a REST API in Play Framework
Article originally posted on my personal website under Building a REST API in Play Framework. Sample requests can also be found there
When building web applications, REST has become the most widely used approach because it is easy to use and easy to implement. In this tutorial I will be showing how to build a simple REST API in Play Framework and will cover the 4 basic functionalities:
 - Create – POST
 - Update – PUT
 - Retrieve – GET
 - Remove – DELETE
Play Framework Java Course
We will be creating a simple API for a student's management software where we can manipulate the students and retrieve the stored ones. It won't be anything too fancy, but an introduction to Play Framework and how a REST API can be build.
Setting up our Entities and DB
First, let's create our database. We will store the student's name, year in the university and the department he is currently studying in. It is a simple structure with only 4 columns (there is also an ID) and nothing more.
db structure
Our entity class looks like this. This will tie the database table to our application model and will allow us to easily map from the DB to a Java class and vice-versa.
package data.domain;
import javax.persistence.*;
@Entity
@Table(name = "students")
public class StudentDO {
 @Id
 @Column
 @GeneratedValue(strategy=GenerationType.IDENTITY)
 private Integer id;
 @Column
 private String name;
 @Column
 private Integer year;
 @Column
 private String department;
}
Enter fullscreen mode Exit fullscreen mode
Building our DAO
Now that we have the Entity, we need to be able to actually store the data in the database and retrieve it when needed. This is done by the JPA Api and Play makes it easy to use it. We will be creating our DAO class that will provide the needed methods for the CRUD operations. CRUD stands for Create, Read, Update and Delete, so these are the methods that we will be implementing.
import com.google.inject.Inject;
import data.domain.StudentDO;
import play.db.jpa.JPAApi;
import javax.persistence.EntityManager;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import java.util.List;
public class StudentDao {
 private static final String ENTITY_MANAGER_NAME = "default";
 @Inject
 protected JPAApi jpaApi;
 public StudentDO create(StudentDO studentDO) {
 jpaApi.withTransaction(entityManager -> { entityManager.persist(studentDO); });
 return studentDO;
 }
 public StudentDO find(Integer id) {
 return jpaApi.em(ENTITY_MANAGER_NAME).find(StudentDO.class, id);
 }
 public List<StudentDO> find() {
 EntityManager entityManager = jpaApi.em(ENTITY_MANAGER_NAME);
 CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
 CriteriaQuery<StudentDO> criteriaQuery = criteriaBuilder.createQuery(StudentDO.class);
 Root<StudentDO> root = criteriaQuery.from(StudentDO.class);
 criteriaQuery.select(root);
 return entityManager.createQuery(criteriaQuery).getResultList();
 }
 public void delete(int id) {
 jpaApi.withTransaction(entityManager -> {
 StudentDO studentDO = entityManager.find(StudentDO.class, id);
 if (studentDO != null) {
 entityManager.remove(studentDO);
 }
 });
 }
 public StudentDO update(StudentDO studentDO) {
 jpaApi.withTransaction(entityManager -> {entityManager.merge(studentDO);});
 return studentDO;
 }
}
Enter fullscreen mode Exit fullscreen mode
We also implemented a method for retrieving all the students that are saved. A more advanced system will also provide filtering options, pagination and other features that are mandatory for an advanced web app, but this will do for our simple REST API tutorial.
The Service and transfer objects
The controller should not communicate directly with the DAO. We should have separation of functionality and each layer has it's own role. The DAO communicates with the database, the Service has the business logic and the Controller is for external access. I won't go into details on this topic, but I usually structure my code like this and it is easier to maintain when you know who is responsible for what.
Also, for more advanced systems you should not return directly the DO to the outside. Instead, we should have a mapping between the Domain object and an externally-used Transfer object. This DTO (Data Transfer Object) is the external representation, while the DO is the internal one. For this simple system, there are no differences (so I won't include the DTO class), but more complex ones usually do have, with the DTO being composed of the data from multiple DOs and with new fields that are processing results.
First, let's create a utility class that maps between Transfer and Domain objects. Nothing to fancy and if you desire you can use BeanUtils to achieve this.
import data.domain.StudentDO;
import data.dto.StudentDTO;
public class StudentMapper {
 public static StudentDTO toTransfer(StudentDO domain) {
 StudentDTO dto = new StudentDTO();
 dto.setId(domain.getId());
 dto.setName(domain.getName());
 dto.setYear(domain.getYear());
 dto.setDepartment(domain.getDepartment());
 return dto;
 }
 public static StudentDO fromTransfer(StudentDTO dto) {
 StudentDO domain = new StudentDO();
 domain.setId(dto.getId());
 domain.setName(dto.getName());
 domain.setYear(dto.getYear());
 domain.setDepartment(dto.getDepartment());
 return domain;
 }
}
Enter fullscreen mode Exit fullscreen mode
Next, our service that handles all the business logic. Again, there is nothing fancy going on in this simple example. We get the DTO, map it to a DO, call the DAO and return the result.
import com.google.inject.Inject;
import data.dao.StudentDao;
import data.domain.StudentDO;
import data.dto.StudentDTO;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
public class StudentService {
 @Inject
 private StudentDao studentDao;
 public List<StudentDTO> getAll() {
 List<StudentDO> studentDOList = studentDao.find();
 return studentDOList.stream().map(domain -> StudentMapper.toTransfer(domain)).collect(Collectors.toList());
 }
 public Optional<StudentDTO> getById(int id) {
 StudentDO studentDO = studentDao.find(id);
 if (studentDO == null) {
 return Optional.empty();
 }
 return Optional.of(StudentMapper.toTransfer(studentDO));
 }
 public StudentDTO create(StudentDTO studentDTO) {
 StudentDO studentDO = StudentMapper.fromTransfer(studentDTO);
 studentDO = studentDao.create(studentDO);
 return StudentMapper.toTransfer(studentDO);
 }
 public Optional<StudentDTO> update(StudentDTO studentDTO, int id) {
 StudentDO fromDb = studentDao.find(id);
 if (fromDb == null) {
 return Optional.empty();
 }
 fromDb.setName(studentDTO.getName());
 fromDb.setYear(studentDTO.getYear());
 fromDb.setDepartment(studentDTO.getDepartment());
 fromDb = studentDao.update(fromDb);
 return Optional.of(StudentMapper.toTransfer(fromDb));
 }
 public void delete(int id) {
 studentDao.delete(id);
 }
}
Enter fullscreen mode Exit fullscreen mode
The Controller and endpoint mappings
The controller is the main entry point, so we need to get the information from the HTTP request, map it into our internal data structure and call the service to do the business logic. In case anything goes wrong we return an HTTP status that correctly reflects what happened. I saw many services that always return 200, even if there was an error or the resource was not found, and provide the error only as a JSON response. This is incorrect and the status should reflect the actual state, with the JSON response needed only for additional information.
import com.fasterxml.jackson.databind.Json


Ronin - Meaning of Ronin, What does Ronin mean?
home > boy names > ronin
Ronin - Meaning of Ronin
What does Ronin mean?
Meaning of the name Ronin
[ 2 syll. ro-nin, ron-in ] The baby boy name Ronin is pronounced as ROWNihN †. Ronin is used mostly in Hebrew and English, and its language of origin is Hebrew and Celtic.
Ronin is a derivative (Hebrew) of the English, Spanish, Dutch, and Hebrew name Ron.
Ronin is also a derivative (English) of the English and Irish name Ronan.
Ronin is somewhat popular as a baby name for boys. The name has been rising in popularity since the 2000s; prior to that, it was of infrequent use only. At the modest peak of its usage in 2012, 0.015% of baby boys were named Ronin. Its ranking then was #771. In 2012, out of the group of boy names directly related to Ronin, Ronan was the most commonly used. The name was twice as popular as Ronin in that year.
Baby names that sound like Ronin include Ronan (English and Irish), Raam (Hebrew), Racham (Hebrew), Raemonn, Rahaeim, Raham (English and Hebrew), Rahan, Rahane, Raheem (Arabic and English), Rahiem, Rahim (Arabic, English, and Iranian), Rahma, Rahmahn, Rahman (Arabic and Turkish), Rahmen, Rahmin, Rahym, Raimee, Raimey, and Raimi.
Ronin Baby Name Explorer
Meaning of Ronin Meaning of Ron Meaning of Ronny Meaning of Ronnie Meaning of Roni Meaning of Ron Meaning of Ronny Meaning of Veronica Meaning of Ronnie Meaning of Aaron Meaning of Ronald Meaning of Rowena Meaning of Rhonda Meaning of Cameron Meaning of Byron Meaning of Jaron Meaning of Myron Meaning of Ronan Meaning of Lerone Meaning of Taron
Baby Name Explorer for Ronin
blue:boy name
red:girl name
italics:unisex name
bold:primary name
Ronin - Meaning of Ronin, What does Ronin mean?


Auto-filling one field same as other
Often when creating a form on a web page, you need your customers to fill out a field such as a mailing address, as well as a billing address. Instead of having your customers fill out the form twice, you can use JavaScript to copy the form's data from one field to another.
You might have noticed that sometimes websites like e-commerce or some government website have two address fields in their forms.One for primary address and another for secondary address(or one for billing address and another for shipping address etc).
Most of the time people have same primary and secondary addresses and to save us from the tedious work of re-entering same data again they have some kind of option to automatically copy the contents of one fields into another.
We are going to see how to make such kind of Auto-Complete form using JavaScript.
In the form we are going to discuss, there is a checkbox and whenever it is checked, the code automatically copies values from primary address and primary zip-code to the secondary address and secondary zip-code respectively.If the checkbox is unchecked, these fields will go blank.
Here is the simple code for such kind of form:

Form Auto Fill :
fieldset{ margin-bottom: 5%; }
AutoFill Form
//Fields for primary address
Primary Address
Address:

Zip code:

If same secondary address select this box.
// Fields for secondary address
Secondary Address
Address:

Zip code:


text:
1nm * DataAnalysis * nCNC * PSM * YourResearch
New data post-analysis tools for A11 nCNC data released
Quite often during a measurement campaign, there is not enough time to really focus on the data of an individual instrument. Sometimes you would for example like to change the settings of the inversion, like the number of size bins or the estimate of diffusion losses in the sampling lines, after the measurement campaign. This is why the Airmodus A11 nCNC system saves both the online inverted data and the raw data.
Airmodus offers free data post-analysis tools that make it possible to invert the A11 nCNC scanning mode data with different settings still after the measurements. As the platform for data analysis, we chose an open source software called Scilab (_URL_ It is a tool that can be used for numerical analysis and data visualization.
Airmodus uses GitHub (_URL_ to distribute the data analysis tools for A11 nCNC data, in order to have fully see-through data analysis—and to have the chance to work with the whole user network on new methods and tools to better use the A11 nCNC data. Every user is free to suggest new functions, methods etc. to the code, and can make their own codes available for other users as well.
The latest version of the scanning data inversion tool has many updates to the data analysis process, including:
- Better utilization of the calibration data
- The fitting is now based on linear interpolation, and thus follows much better the calibration data.
- Better data visualization
- The data bins are visualized for individual size distribution scans. Also, the total number of particles above the largest size bin is plotted.
- New optional data quality check before the inversion is implemented
- This option prevents inversion errors by not inverting unqualified data. Please see the Airmodus GitHub page for more information.
- Improved error handling


Starter Page
Priming & Capping: Part 1
 1. Calculate the amount of sugar needed, if not provided in a kit. Use the fermentation temp.
 1. Tasty Brew Priming Calculator
 2. Boil 1-2 cups of water.
 3. Stir in the priming sugar.
 4. Cover the pan until ready to add to the bottling bucket.
Transfer and Final gravity measurement
Transfer from secondary to bottling bucket. Be careful not to agitate the gelatin on the bottom and try to limit the exposure to oxygen. Take a final gravity sample.
 1. Place the straining bag over the output of auto-siphon.
 2. Gently transfer the beer from the fermenter to the bottling bucket.
 3. Place the thermometer and the hydrometer in the bucket.
 4. Spin the hydrometer to get any bubbles of of it.
 5. Take a final gravity (FG) measurement.
 6. Record the temperature.
 8. Calculate the alcohol percentage.
 1. I've added the formulas to my excel sheet (see the link at the top).
 2. Otherwise, I use an app (ABV Calculator for android) so I don't have to worry about the formulas.
Priming & Capping: Part 2
The priming sugar will throw off any hydrometer reading. Make sure you are done before proceeding.
 1. Add the priming sugar to the bottling bucket.
 2. Gently stir to beer to mix in the priming sugar well.
 3. Bottle and cap.
 4. Print out labels and attach them.
 5. Leave at 70 degrees in a dark area.
Day 56+: Drinking Time
The time to bottle conditioning varies quite a bit, but the "normal" way is to wait at least 3 weeks. Its said that the long the better the beer will turn out, but I imagine just like secondary fermentation this varies with the beer.
Dilbert Cartoon
 1. (11/13/2013) Initial Post.
 2. (12/3/2013) Adding a second cold crash prior to adding the gelatin as this makes the gelatin more effective.
 3. (12/5/2013) Added my spreadsheet that follows my brewing plan.
 4. (12/30/2013) Added making a yeast starter to my process.
 5. (1/3/2013) Added squeezing the steeping bag and placing yeast starter in water.
 6. (3/9/2014) Changed how I do gelatin, Updated dry hopping now that I've done it once, days for completion.
 7. (4/17/2014) Several updates all around for a slightly more refined process.
Leave a Reply


text:
USACE New Orleans District builds underwater sill
The U.S. Army Corps of Engineers, New Orleans District, is continuing to build an underwater sill at the bottom of the Mississippi River to stop the saltwater wedge from creeping further up the river.
Survey teams have been measuring the height of the sill since the Corps began constructing it Oct. 11, and as of Oct. 18 the top of the sill is close to -55 feet deep (or about 40 feet high from the bottom of the river).
To measure the height of the sill, Corps survey boats use a multibeam echosounder, a high-resolution full-coverage sonar system.
According to USACE, the sill is being built near river mile marker 63.8.
The Corps is using a dredge to pump sediment into a series of pipes, which then drop the sediment into the River to build the sill.
The sill is still expected to be completed within the two-week timeframe initially projected by the Corps.


text:
This study identifies relatively low-cost, quick-implementation measures that can significantly improve pedestrian and bicyclist access at six locations in the Massachusetts Bay Transportation Authority system: Ayer Station (commuter rail); Boston College Branch (B Line) stops, Boston College Station to Chestnut Hill Avenue (Green Line); Cleveland Circle and Reservoir stops (Green Line, C and D); Forest Hills Station (Orange Line, commuter rail, and bus); Malden Center Station (Orange Line, commuter rail, and bus); and Mansfield Station (commuter rail and bus). Detailed in the report are improvements to both station property and surrounding areas that would eliminate hazards for bicyclists and pedestrians, increase ease of access to the station from surrounding neighborhoods for those users, or otherwise enhance the attractiveness of the station for access by foot or bicycle. The report also includes a summary that describes the types of issues encountered and provides general recommendations for improving pedestrian and bicyclist access to other transit stations in the region.
Click here to download this report (7.7 MB).
Due to the size of this document, it can be downloaded in sections:


Edit Article
Two Methods:Editing Text With Acrobat XI ProEarlier Versions of Acrobat Pro/Adobe Acrobat 8 and prior
Have you come across a wrongly-spelled or formatted piece of text in an Adobe Acrobat PDF file? Did you realize that you can edit this text? The TouchUp Text Tool in Adobe Acrobat will help you fix these mistakes. Learn how to use this feature from this article.
Ad
Method 1 of 2: Editing Text With Acrobat XI Pro
 1. Edit Text in Adobe Acrobat Step 1.jpg
 1
 Launch Adobe Acrobat. Open the file that you would like to change/improve.
 Ad
 2. Edit Text in Adobe Acrobat Step 2.jpg
 2
 Expand the Tools sidebar. At the top of the document, click on the Tools button. A sidebar will appear. Click on Content Editing to expand that field, then click in Edit Text & Images.
 - The editable text blocks will be outlined.
 3. Edit Text in Adobe Acrobat Step 3.jpg
 3
 Edit the text. Select the text you wish to edit in the standard fashion: click to insert the cursor, click and drag to select multiple characters, double-click to select an entire word, or triple-click to select the entire text block.
 4. Edit Text in Adobe Acrobat Step 4.jpg
 4
 Adjust the text blocks. In Acrobat XI, the text now flows and wraps as one would expect. If you add or remove a significant amount of text, you will want to adjust the text blocks to fit the document.
 5. Edit Text in Adobe Acrobat Step 5.jpg
 5
 Click in a text block to select it. It will have a blue outline, with blue handles on the corners and centers.
 - To adjust the size of a text block, click on a blue handle, and drag as necessary. To adjust the position of a text block, place your cursor over a horizontal or vertical line. The cursor will change to a cross, and you can drag the text block in any direction.
 - Note the green guide lines—those help you keep your text aligned with other text objects on the page you're editing. Holding Shift will snap to horizontal or vertical dragging.
 6. Edit Text in Adobe Acrobat Step 6.jpg
 6
 Edit the font. Acrobat XI also makes it easy to edit font attributes. Select the word, phrase, or text block you want to edit, then adjust as desired from the Format panel.
 7. Edit Text in Adobe Acrobat Step 7.jpg
 7
 Don't forget to save your work!
Method 2 of 2: Earlier Versions of Acrobat Pro/Adobe Acrobat 8 and prior
 1. Edit Text in Adobe Acrobat Step 8.jpg
 1
 Determine how much editing you'll need to do.
 - The steps below for Basic Editing applies to those who only need to add or replace words, and don't need more advanced text editing options.
 - The steps below for Advanced Editing apply to text edits that require additional tools such as changing the font style, color, or other options. those used solely by the Basic Editing tools.
 2. 2
 Realize that not all PDF documents are editable. There are some documents that can't be modified, even with Acrobat Pro.
 Ad
Part One: Basic Editing
 1. Edit Text in Adobe Acrobat Step 10.jpg
 1
 Launch Adobe Acrobat.
 2. Edit Text in Adobe Acrobat Step 11.jpg
 2
 Open the document containing the text that needs to be edited.
 3. Edit Text in Adobe Acrobat Step 12.jpg
 3
 Select the TouchUp Text Tool. Click on the Tools menu, then select Advanced Editing > TouchUp Text Tool from the pop out menu.
 4. Edit Text in Adobe Acrobat Step 13.jpg
 4
 Wait for the editor to initialize. This should only take a few moments to complete.
 5. Edit Text in Adobe Acrobat Step 14.jpg
 5
 Select the word or phrase that you need to change., Double-click the text, or click and drag the text to highlight the phrase.
 6. Edit Text in Adobe Acrobat Step 15.jpg
 6
 Type to replace the selected text.
 Ad
Part Two: Advanced Editing
 1. Edit Text in Adobe Acrobat Step 16.jpg
 1
 Launch Adobe Acrobat.
 2. Edit Text in Adobe Acrobat Step 17.jpg
 2
 Open the document containing the text that needs to be edited.
 3. Edit Text in Adobe Acrobat Step 18.jpg
 3
 Select the TouchUp Text Tool. Click on the Tools menu, then select Advanced Editing > TouchUp Text Tool from the pop out menu.
 4. Edit Text in Adobe Acrobat Step 19.jpg
 4
 Wait for the editor to initialize. This should only take a few moments to complete.
 5. Edit Text in Adobe Acrobat Step 20.jpg
 5
 Select the word or phrase that you need to change., Double-click the text, or click and drag the text to highlight the phrase.
 6. Edit Text in Adobe Acrobat Step 21.jpg
 6
 Right-click the selected text.
 7. Edit Text in Adobe Acrobat Step 22.jpg
 7
 Select "Properties" from the menu.
 - You can change the font type by clicking the drop-down menu at the top of the dialog box and selecting your font you'd like to use.
 - You can change the font size by clicking the "Font Size" box and typing your specified new value.
 - You can change the font color by selecting the "Fill" box and selecting a new color.
 - There are also other changes that you can make, such as character spacing, word spacing, horizontal scaling, stroke color (useful for bolding a phrase, since there isn't a bold or italic option available for editing), stroke width, and baseline offset size.
 - You can also embed the font into your document, however, most documents won't need their font to be embedded to be effectively viewed and understood.
 Ad
We could really use your help!
Can you tell us about
hairstyling?
Yes
No
hairstyling
how to do your hair for school
Can you tell us about
relationships?
Yes
No
relationships
how to get your mind off a girl
Can you tell us about
success hacks?
Yes
No
success hacks
how to start fresh
Can you tell us about
computers?
Yes
No
computers
how to connect a mic to a computer
Thanks for helping! Please tell us everything you know about
...
Tell us everything you know here. Remember, more detail is better.
Tips
Provide Details.
Please be as detailed as possible in your explanation. Don't worry about formatting! We'll take care of it. For example:
Don't say: Eat more fats.
Do say: Add fats with some nutritional value to the foods you already eat. Try olive oil, butter, avocado, and mayonnaise.
Tips
 - If the document has previously been a scanned in document and hasn't been saved in the PDF-editable format, you won't be able to edit the text. You will, however, be able to send a comment about the text, after running an OCR scan on the document.
 - The TouchUp Text Tool has been around since the days of Adobe Acrobat 6, and has been available on every Adobe Acrobat version ever since then (including inside the Standard, Pro and Suite versions of the suite of tools). However, it's been eliminated as of Acrobat XI.
 - The TouchUp Text Tool will not help you edit WordArt images, as these are images, not text, therefore Adobe Acrobat won't recognize these pieces as "text".
Warnings
 - You can only edit text with Acrobat Pro, the paid version. Acrobat Reader is, as the name suggests, only a reader.
Things You'll Need
 - Adobe Acrobat program
 - PDF file
 - computer mouse and keyboard
Sources and Citations
 - Adobe Acrobat 8 Help Guide (Edit Text section/Edit Text in a Document subtopic)
 - Adobe Acrobat 8: Classroom in a Book. Berkeley, CA: Adobe, 2006. Print.
Article Info
Categories: Adobe Acrobat
In other languages:
Español: Cómo editar texto en Adobe Acrobat, Italiano: Come Modificare Testo in Adobe Acrobat, Português: Como Editar Texto no Adobe Acrobat, Deutsch: Text in Adobe Acrobat bearbeiten, Русский: редактировать текст в Adobe Acrobat
Thanks to all authors for creating a page that has been read 274,415 times.
Did this article help you?
Yes No
Become
an Author!
Write an Article


text:
Cartographic Representations in ArcGIS Engine
A customer will use PLTS Nautical to collect/manage data and to create/manage a number of charts. They want to create applications using ArcGIS Engine to view the MXDs that they will be creating. As I understand it, PLTS Nautical makes extensive use of cartographic representations. I know these can be viewed in standard ArcMap (no PLTS installed). I'm wondering if these MXDs can view displayed and used in ArcGIS Engine applications.
Mapping Center Answer:
ArcGIS Engine supports cartographic representations through the Carto reference library. The interfaces that manage representations in ArcGIS Engine can be found under the following directories:
- IRepresentationLegendClass: Provides access to the properties and methods of a RepresentationLegendClass
- IRepresentationRenderer: Provides access to the properties and methods of a RepresentationRenderer
- IRepresentationGraphics: Provides access to the content of a RepresentationGraphics object.
- IRepresentationMarker: Provides access to members that control a representation marker.
- IRepresentationRule: Provides access to members that control a representation rule.
- IRepresentationRule2: Provides access to members that control a representation rule.
- IRepresentationRuleInit: Provides access to members that initialize a representation rule.
- IRepresentationRuleItem: Provides access to methods defining a representation rule item.
- IDERepresentationClass: Provides access to members that return information about representation class data elements.
Keep in mind that representation capabilities are determined by the ArcGIS Desktop user license.
If you would like to post a comment, please login.


A simple model of zonal gel filtration is analysed numerically to establish semiquantitatively how the capacity of a protein-ligand complex to survive gel filtration intact depends on several experimental variables and on the kinetic characteristics of the complex. The design of gel-filtration experiments aimed at detecting and partially purifying binding proteins is discussed.
This content is only available as a PDF.
You do not currently have access to this content.


text:
The National Piping Centre receives many requests for filming and visits by journalists throughout the year. We are happy to accommodate these requests where possible, however availability is limited, so if you would like to arrange a media visit, the following charges will apply:
- Print journalists, with a group of 2 or less – Free of charge. These visits must be planned around our tour times and days, and agreed in advance with the management
- Film crews with 2 or more people. Where possible we will organise a 3 hour media slot in our venue with a piper. This allows you access to the Museum of Piping to film general shots. Many of the items in our collection are on loan from National Museums Scotland (NMS). For permission to film close ups of these objects you need to also obtain permission from NMS. The cost for this visit is £250 for a 0 – 3 hour visit.
On your visit we will provide:
- Up to three hours of filming permission.
- Access to our Museum of Piping or Auditorium (if available) for your filming.
- A bagpiper in full day dress, who can speak knowledgeably about the history of piping, conduct a tour of our museum and will guide you through the basics of playing the bagpipes as you try them out.


text:
Hawai'i P-20 Partnerships for Education
Hawaiʻi P-20 is a statewide partnership led by the Executive Office on Early Learning, the Hawai'i State Department of Education and the University of Hawai'i System works to strengthen the education pipeline from early childhood through postsecondary education and training with data-informed decision making, advocacy, policy coordination and shared action. Our work is focused on high expectations and equitable access, so all students can thrive in school, career and life.
- Increase 3rd Grade English Language Arts and Math Proficiency
- Increase Number of 9th Grade Students on Track to Graduate
- Increase High School Graduates Enrolling Directly into Postsecondary
- Align, Integrate and Sustain College and Career Pathways for All Students
Who We Are
Hawaiʻi P-20 Leadership & Partners
Hawaiʻi P-20 Council Members
Hawai'i P-20 convenes a Hawai'i Hawai'i P-20 Advisory Council which is a group of leaders from education, business, labor, government and community who share a common vision and mission of improving educational outcomes for the state. Through the unique knowledge and perspective of its members, the council provides support, information and guidance to the Hawai'i P-20 leadership and staff, and advocates for statewide educational planning and policy.
Hawaiʻi P-20 is thankful to our many supporters who help us advance our work in strengthening the educational pipeline.


Take the 2-minute tour ×
Is there a result in the spirit of Bertrand-Chebyshev which talks about the existence of prime powers between n and 2n (or 3n or something like that) for n large?
share|improve this question
3 Answers 3
up vote 7 down vote accepted
It follows from the prime number theorem that for fixed $k$, provided $n$ is sufficiently large, there is a prime $p$ such that $p^k$ is between $n$ and $2n$. Does this answer your question?
share|improve this answer
Thank you very much for your quick answer. Yes, it answers the question, and it goes to show the power of the PNT. – Chebolu Apr 27 '11 at 16:01
I wonder if there is an elementary proof of this without using PNT, like Erdős' proof of Bertrand's Postulate? – Tony Huynh Apr 27 '11 at 17:24
Actually there is a power of 2. It goes to show the power of binary arithmetic... : write 2n in binary and write zeroes after the initial one.
share|improve this answer
In other words, if $2^{k - 1}$ is the largest power of 2 less than n, then $n \leq 2^k < 2n$? – Ryan Reich Apr 27 '11 at 18:14
Yes, you said it. – Charles Matthews Apr 27 '11 at 18:43
For fixed $k$, the existence of a prime power $p^k$ between $n$ and $2n$ is (asymptotically) equivalent to the existence of a prime $p$ between $m$ and $\sqrt[k]{2} m$ where $m = \sqrt[k]{n}$. Bachraoui gives an elementary proof here that there exists a prime between $m$ and $\frac{3}{2} m$ for sufficiently large $m$.
I remember reading on MO that it is known that similar elementary proofs exist for showing the existence of primes between $m$ and $(1 + \epsilon) m$ for any $\epsilon > 0$ and, furthermore, that the existence of these proofs itself depends on the PNT. However, I can't track down where I read this.
share|improve this answer
Possibly it is this question you have in mind: mathoverflow.net/questions/53498/nontrivial-circular-arguments – quid Apr 27 '11 at 19:00
Yes, that's the one. – Qiaochu Yuan Apr 27 '11 at 20:11
Your Answer