Day: March 24, 2022

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Why Does Duramax Have This Exhaust Tip?

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It's for the venturi effect and allows the exhaust gases to be cooled before the. exit the tip, which then reduces the chance of burning someone or catching something on fire.

The 1,000 degrees fahrenheit exhaust during re-gen is pretty hot, with paper burning at around 480 degrees, or so we are told. I could understand why you might want to cool down. Diesel emissions technology really has helped to clean up the cities, even if it some places it's pretty silly like on farms and remote areas. But I guess you can't have one farm tractor to work the land in Southern California where pollution is a problem while in South Dakota there is little issues with air pollution.

Microplastics Found In Human Blood In First-Of-Its-Kind Study | IFLScience

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Microplastics Found In Human Blood In First-Of-Its-Kind Study | IFLScience

In a human living in the 21st-century industrialized world, there’s a good chance that microplastics are pumping around in your veins if this small first-of-its-kind study is anything to go by.

Reporting in the journal Environment International, scientists from the Vrije Universiteit Amsterdam developed a method to accurately measure concentrations of microplastics in human blood for the first time.

PLASTIC PLANET even in your BLOOD

 

New Linux kernel has improved random-number generation • The Register

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New Linux kernel has improved random-number generation • The Register

A significant rewrite of the Linux kernel's random-number generator is underway, ensuring Linux-based cryptography is a bit more secure, particularly in virtual machines, and some software a bit smoother to run.

As outlined by the author of the changes, Jason A Donenfeld, the newly released kernel 5.17 contains the first stage of the big rewrite, but more will follow in 5.18. Among other changes, the /dev/random and /dev/urandom devices now do exactly the same. This brings the Linux kernel in line with FreeBSD and macOS.

The code is contained in a module called random.c, originally written by Ted T'so for kernel 1.3 in 1994. It implements a Unix-style special character device called /dev/random which gives a stream of pseudorandom data. Building this into the kernel was a big deal, and the /dev/random device was adopted into DEC/Compaq Tru64, FreeBSD, HP-UX, IBM AIX, NetBSD, macOS, SGI IRIX, and Sun Solaris. This might make it one of the single most widely influential new features from Linux onto the broader Unix world.

Generating truly random numbers in pure software is non-trivial. If you run the same code repeatedly with the same inputs, it should produce the same results. Thus if you write a program to output random numbers, it'll produce a predictable, pseudorandom stream of values. If you can predict the output, you can figure out how software using it is going to work and, for instance, break encryption based on it. Researchers managed this for Windows 2000, for instance.