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The new nanoporous material promises to enhance batteries and catalysts

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The Belgian research center Imec announced the development of an affordable technology for producing nanoporous material with outstanding qualities. The unique material, in the form of a nano-porous structure, possesses extremely high porosity and an unprecedented surface-to-volume ratio. Imagine a small can of soda, 75% of which is empty space with a total surface area equivalent to a football field. Moreover, the production of the material is quite straightforward […]

Situation: virtual GPUs are not inferior in performance to hardware solutions.

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In February, a conference on high-performance computing (HPC) took place at Stanford. VMware representatives shared that when working with GPUs, a system based on a modified ESXi hypervisor performs comparably to bare metal solutions. We discuss the technologies that made this possible. / photo Victorgrigas CC BY-SA Performance Issue According to analysts, about 70% of workloads in data centers are virtualized. […]

Configuring 802.1X on Cisco Switches Using Redundant NPS (Windows RADIUS with AD)

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Let's look into the practical use of Windows Active Directory + NPS (2 servers for redundancy) + the 802.1x standard for access control and user authentication – domain computers – devices. You can refer to the theory regarding the standard in Wikipedia, at the following link: IEEE 802.1X. Since my 'laboratory' is resource-limited, I will combine the roles of NPS and domain controller, but […]

User Documentation: What Makes It Bad and How to Fix It

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Software documentation is just a collection of articles. But even they can be frustrating. First, you spend a long time looking for the right instruction. Then, you try to make sense of the incomprehensible text. You follow the instructions, but the problem remains unsolved. You search for another article, getting more and more anxious… After an hour, you give up and walk away. That's how poor documentation works. What makes it so bad, and how can it be improved […]

New World Record for Calculating Pi: 31.4 Trillion Digits

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The Bailey–Borwein–Plouffe formula allows you to extract any specific hexadecimal or binary digit of the number pi without calculating the preceding ones (the current record was set using the Chudnovsky algorithm, see below). The Google Compute Engine computational cluster calculated the largest number of digits in pi over 121 days using 25 virtual machines, establishing a new world record: 31.4 trillion digits […]

Speeding up File I/O in C/C++ Without Too Much Effort

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Preface There exists a simple yet highly useful utility in the world — BDelta, which has long been embedded in our production process (though I couldn't install its version, it was certainly not the latest available). We use it for its intended purpose — building binary patches. Looking at what's in the repository, it becomes a bit […]

Flightradar24 — how does it work?

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Probably everyone who has ever seen off or accompanied relatives or friends on a plane has used the free service Flightradar24. It's a very convenient way to track a plane's position in real-time. As a survey of acquaintances showed, very few people know that this service is supported only by enthusiasts who send data to the server. Even fewer know that anyone interested can join the project. […]

Acer TravelMate X514-51 — a 14” laptop weighing less than a kilogram for business professionals.

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Acer has announced the TravelMate X514-51 business laptop powered by Windows 10 Pro, marketed as one of the thinnest and lightest laptops on the market. Its body thickness is 15 mm, and it weighs 980 grams. The TravelMate X514-51 is made from a magnesium-lithium and magnesium-aluminum alloy, which is stronger than aluminum while being significantly lighter. The TravelMate X514-51 features a 14-inch […]

How to integrate Ovirt and Let's Encrypt

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As I embark on improving the infrastructure, I resolved to tackle an ancient and painful issue — to allow my colleagues (developers, testers, admins, etc.) to manage their virtual machines in oVirt without unnecessary movements. In oVirt, there are several components that need to be configured to address my issue: the web interface itself, the noVNC console, and the upload of disk images. The 'Make It Awesome' button was […]

Migration from Nagios to Icinga2 in Australia.

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Hello everyone. I am a Linux sysadmin, relocated from Russia to Australia on a skilled independent visa in 2015, but this article will not be about how a piglet got a tractor. There are already plenty of articles on that topic (however, if there's interest—I can write about it), so I wanted to share what I have […]

Flightradar24 — how does it work? Part 2, ADS-B protocol

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Hello Habr. Probably everyone who has ever seen off or met relatives or friends at the airport has used the free service Flightradar24. It is a very convenient way to track the position of an aircraft in real time. The first part described how such an online service works. Now we will go further and find out what data is transmitted to and received from the aircraft to the receiving station […]

Analytics of women with low social responsibility (Powered by Power BI, Qlik Sense, Tableau)

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Who are we and what were the premises of the project? Good day, my name is Vladimir Lazarev, I am the head of the BI integrator Analytics Group. We create visual reports for businesses based on marketing, sales, finance, and logistics using leading analytics platforms like Qlik Sense, Power BI, and Tableau. In BI platforms, the visual component is very important. If you have watched dozens of demo reports from BI systems and you […]

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