Site news
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I had no choice. Support for Joomla 3 is coming to an end, and we cannot live with a content management system that no longer receives security updates.
So slowly, slowly, I went through all my Joomla Web sites (I have several) and updated them to Joomla 4. It was a painful process. The template I use for visual presentation is old (I know, I know, but that's a project for another day.) There were incompatibilities.
Also, back in those more innocent days when I began using Joomla (version 1.5!) I grabbed a few useful extensions in the hope that they'd make my life easier. They did... for a while. But eventually they turned into liabilities. Many of them are no longer maintained, and often, there are serious incompatibilities with Joomla 4. So I had to get rid of them, either rewriting pages to no longer rely on the component, or creating a replacement component myself.
Long story short, my Web site is now fully functional in the test environment where I am writing these words. If all goes well, within minutes I should be able to install this in the production environment as well. We shall see how it goes.
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Now that I not only have a much improved Hawking radiation calculator (which now correctly calculates black hole lifetimes) but also a simple cosmology calculator, I decided to make these calculators available directly from the site's top-level menu. Enjoy!
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I prepared a revised translation of Kaluza's 1921 paper on 5-dimensional spacetime used to unify gravity and electromagnetism. My version is based on a 1984 translation provided by T. Muta, but revised and formatted using LaTeX to closely match the original paper in appearance and pagination. I also restored Kaluza's original notation.
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I use a third party Joomla extension library, BK-Thumb, to manage pictures on some of my pages. A recent Joomla update caused a spurious Multithumb error to show up on several of my pages that do not even use Multithumb features. This has now been corrected.
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Reorganized the Miscellaneous writings section, created a new subcategory for my ramblings from the pre-blog era.
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Tonight, I updated this site so that all pages that contain mathematical equations now use MathJax instead of the older jsMath. MathJax works much better, it seems, than jsMath, especially in Internet Explorer. Hopefully, the equations are still correct after all this formatting and reformatting. Hopefully, they were correct in the first place.
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Imported the NASDAQ Settlement Date Calendar, a Web application I developed years ago, into the CMS site.
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A new layout and a new engine: Moving my site to the Joomla! content management system is nearly complete. It was about time; my old site was soooo 1990s!
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My Day Book is now a blog (dang, I still hate this word): I purchased the domain spinor.info and set up a WordPress site there.
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Organized my physics notes; added another, on the principle of gauge invariance.
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And yet another physics note: this one to explain why it isn't as easy as some would-be Einsteins think to disprove that the speed of light is constant.
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Added another note on quantum physics: specifically, on Quaternions and the Dirac Equation.
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Added a page explaining how to use Rogers' wireless Internet service from a Linux computer.
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Updated the page containing my ActiveX controls that are available for sale.
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Yet another one-of-a-kind addition to my "calculator museum": the HP Xpander, another unreleased model.
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New additions: a list of "live" deep space probes, and an interactive altitude map of the "seas" of Mars.
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Link added to british-legends.com, home of the original Multi-User Dungeon, still one of the best online games after more than 20 years in existence
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I added some notes on mixing digital audio - a problem I encountered recently while working on a project.
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An amazing new addition to my calculator collection: a prototype of the never released TI-88.
