Influence of signal frequency on the energy of radio links in free space

Influence of signal frequency on the energy of radio links in free spaceWhat changes when the applied frequency band is changed in radio communication is not always correctly formulated even by experienced radio amateurs. On the one hand, the formula for transferring Friis is extremely simple, and there seems to be nothing to discuss. On the other hand, in this formula, in addition to explicitly mentioning the wavelength λ, it is implicitly hidden in other coefficients. There are many statements, notes and articles, that with higher frequencies the power of radio links is worse, there are no less articles of "myth exposures" - saying that there is nothing worse than ...
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Installation of 3CX on hosting for ??? Euro /month. for 10 minutes

Installation of 3CX on hosting for ??? Euro /month. for 10 minutesPerhaps you know that at the moment, 3CX provides free hosting ATS For all new users on Google's cloud infrastructure for 1 year. However, for existing users of 3CX or those who want to use commercial hosting right away, in order not to "move" in the future, it makes sense to install ATS on an inexpensive virtual Linux machine in a reliable data center. The advantage of installing 3CX on your own virtual machine compared to the so-called. "Virtual PBX" is that you completely control both PBX services and confidential data - history and records of conversations.
 
 
3CX has done a lot of work ...
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Trans-KRK: one of the standards of vision correction

Trans-KRK: one of the standards of vision correction
 
Today again I will tell you about lasers, cornea and vision correction. But this time we will not talk about different versions of LASIK and ReLEx SMILE, but about the latest modifications of TransFRK. The method all unjustly kicks, calling obsolete and inferior in all other technologies. Plus, it is constantly confused with the usual PRK, despite the fact that there is a real technological gap between them. I will try to show why this is not so, but at the same time I will tell you why we queue up before starting recruitment to flight schools and educational institutions of the Ministry of Internal Affairs.
 
 
 
[h2] Th...[/h]
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Upgrade the text protocols to binary and we struggle with the legacy code at the C ++ User Group

Upgrade the text protocols to binary and we struggle with the legacy code at the C ++ User Groupmeeting. We invite you to the next meeting of the C ++ User Group, which will be held on June 28 in the framework of our event platform CoLaboratory. Last time we discussed the performance and the Clang Static Analyzer. Now let's talk about painful: how to get rid of legacy-code? How to avoid its formation in the future? What difficulties arise when upgrading the protocol of interaction, and how to deal with them? here .  In addition, we will conduct an online broadcast on YouTube channel Kaspersky Lab Russia for those who did not have time for us...
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Opportunity "fell asleep" because of the sandstorm on Mars. It is not yet clear whether the rover will be able to work again

Opportunity "fell asleep" because of the sandstorm on Mars. It is not yet clear whether the rover will be able to work again  
 
Despite the extremely sparse Martian atmosphere, she sometimes surprises. More recently, Mars began to "storm", resulting in the atmosphere was a large number of small particles. They closed the Sun, so that the surface of the Red Planet along with the objects on it began to receive much less light than before.
 
 
One of these objects is the rover Opportunity, which has been studying Mars for many years, helping scientists to obtain new facts about the neighbor of the Earth. Yesterday NASA held a press conference ...
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Following the tracks meetup "New features of PostgreSQL 11"

Today we will talk about the most important features of PostgreSQL 11. Why only about them - because some features are not needed by all, so we stopped at the most popular.
 
 

Table of contents


 
Following the tracks meetup "New features of PostgreSQL 11"
 
 
JIT-compilation
 
Sectioning
 
Indices
 
Covering indices
 
SP GiST
 
Productivity
 
WAL
 
Backup and replication
 
For DBA
 
Parallel execution of
 
Optimizers
 
Window functions
 
Changes in the full-text search
 
Json (b) and the full text of
 
...[/h]
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Using Docker to build and run a project in C ++

This publication will discuss how to build a C ++ project using GTest and Boost using Docker. The article is a recipe with some explanatory comments, the solution presented in the article does not pretend to be a Production-ready status.
 
Why and to whom might this be needed?
 
Suppose that you, like I really like the concept of Python venv when all the necessary dependencies are located in a separate, strictly defined directory; or you need to ensure a simple portability of the build and test environment for the project being developed, which is very convenient, for example, when joining ...
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Open webinar: "Neural networks for pharmaceutical problems"

Hello!
 
 
In this open lesson, Arthur Kadurin tells you how neural networks help save lives.
 
 
Also we suggest you to learn more about our Machine Learning course at The day of the open doors Today at 20:00 Moscow time!
 
 
Hello!  In this open lesson, Arthur Kadurin tells you how neural networks help save lives.  Also we suggest you to learn more about our Machine Learning course at The day of the open doors Today at 20:00 Moscow time!   ...
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Kaggle: Amazon from Space - tricks and khaki for learning neural networks

Kaggle: Amazon from Space - tricks and khaki for learning neural networks  
 
Last summer, was over. competition on the kaggle site, which was devoted to the classification of satellite imagery of the Amazon forests. Our team took 7th place out of 900+ participants. Despite the fact that the competition ended a long time ago, almost all the methods of our decision are applicable so far, not only for competitions, but also for training neural networks for selling. For details under cat.
 
albu [/i]
 
At the time of participation in the competition, he directed all ml of the direction in the company Geoscan. But since then ...
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What I learned after going through a lot of interviews in companies and start-ups from the field of AI

What I learned after going through a lot of interviews in companies and start-ups from the field of AIOver the past eight months, I've been interviewed in a wide variety of companies - DeepMind at Google, Wadhwani Institute of AI, Microsoft, Ola, Fractal Analytics and some others - mainly at the position of Data Scientist, Software Engineer and Research Engineer. In the process, I was given the opportunity not only to communicate with many talented people, but also to look at myself in a new way with an understanding of what employers want to hear when they talk with candidates. I think if I had this information before, I could avoid many mistakes and prepare for interviews much better. This was ...
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