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Antennas in Linux

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Linux

For this article, I want to introduce a piece of software I've actually used recently in my own work. My new day job involves studying the ionosphere using an instrument called an ionosonde. This device is basically a giant radio transmitter that bounces radio waves off the ionosphere to see its structure and composition. Obviously, an important part of this is knowing the radiation pattern of the various transmitters and receivers.

Several methods exist for modeling the electromagnetic fields around conductors, but here I'm covering one called NEC2 (Numerical Electromagnetics Code). It originally was developed in FORTRAN at the Lawrence Livermore National Laboratory in the 1970s. Since then, it's been re-implemented several times in various languages. Specifically, let's look at xnec2c. This package implements NEC2 in C, and it also provides a GTK front end for interacting with the core engine.

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More in Tux Machines

Dodging derailment by SUSE, OpenStack Train is scheduled to arrive this week

With its OpenInfrastructure summit mere weeks away, the OpenStack gang is emitting its next release in the form of "Train" with a focus on data protection and machine learning. The release comes after foundation platinum member SUSE threw in the towel over OpenStack Cloud in order to move on to a bright, Kubernetes-based future. Not that the "S" word was mentioned, even in a waveringly high-pitched tone, as OpenStack readied Train ahead of a release expected on 16 October. As is the norm, OpenStack was keen to shout about the more than 25,500 accepted code changes this time around, from 1,125 developers over 150 organisations. A glance at the content of the release shows that OpenStack is as bewilderingly vast as ever, although a number of tweaks merit closer attention. Read more

New "FUSE2" Kernel Driver Being Experimented With For File-Systems In User-Space

Longtime FUSE developer Miklos Szeredi of Red Hat has been working on a new "FUSE2" FUSE kernel driver for implementing file-systems in user-space. FUSE2 is a completely new "File-System in User-Space" kernel driver being worked on and presented as a new FUSE2_FS Kconfig option that simply describes it as an "experimental new fuse driver" and with interface changes compared to the existing FUSE kernel driver is now exposed via /dev/fuse2. Read more

Debian: Bullseye Security, Debian XMPP Team and Raphaël Hertzog's Work

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    Debian 11 codename Bullseye is already in the works. Is interesting to make decision early in the development cycle to give people time to accommodate and integrate accordingly, and this post brings you the latest update on the plans for Netfilter software in Debian 11 Bullseye. Mind that Bullseye is expected to be released somewhere in 2021, so still plenty of time ahead. The situation with the release of Debian 10 Buster is that iptables was using by default the -nft backend and one must explicitly select -legacy in the alternatives system in case of any problem. That was intended to help people migrate from iptables to nftables. Now the question is what to do next.

  • Debian 11 To Further Deprecate IPTables In Favor Of Nftables Plus Promoting Firewalld

    With Debian 11 "Bullseye" the plan is to drop the "important" priority on the iptables package while promoting nftables to important. That change of priority effectively makes NFTables set to be installed by default for Debian 11 while dropping IPTables from the default package set. IPTables though is still expected to be found within the Debian 11 archive but not installed by default.

  • Debian XMPP Team: New Dino in Debian

    Dino (dino-im in Debian), the modern and beautiful chat client for the desktop, has some nice, new features. [...] Note, that users of Dino on Debian 10 (buster) should upgrade to version 0.0.git20181129-1+deb10u1, because of a number of security issues, that have been found (CVE-2019-16235, CVE-2019-16236, CVE-2019-16237).

  • Freexian’s report about Debian Long Term Support, September 2019

    Like each month, here comes a report about the work of paid contributors to Debian LTS.

Top 20 Best NodeJS CMS Platforms To Use in 2019 and New WordPress RC

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    NodeJs has been a popular web framework. It has been used to develop highly scalable web applications. A statistic shows that more than 1.5 Lakh websites are using NodeJs on a regular basis. And the number is increasing proportionally. When it comes to Content Management System (CMS), many NodeJs frameworks have been leading the way to a consistent digital content platform. For years now, NodeJs has been used to create some powerful CMS architectures. If you look closely, you will find some useful NodeJs CMS structures that you have been looking for your projects.

  • WordPress 5.3 Release Candidate

    The first release candidate for WordPress 5.3 is now available! This is an important milestone as we progress toward the WordPress 5.3 release date. “Release Candidate” means that the new version is ready for release, but with millions of users and thousands of plugins and themes, it’s possible something was missed. WordPress 5.3 is currently scheduled to be released on November 12, 2019, but we need your help to get there—if you haven’t tried 5.3 yet, now is the time!