fraserphysics

The second law of thermodynamics implies that one must spend energy as work to move thermal energy up a temperature difference. So the net effect of an air conditioner is to increase the total amount of thermal energy.

For a long time I've been reading that the closure of Hormuz is going to constrain consumption soon. I understand the economic theory that reducing supply of an inelastic commodity greatly increases the price. The article says that inventories have insulated us from high prices so far. I am surprised by how large and effective those inventories have been. And I am surprised that futures prices are not higher. Can anyone here suggest explanations?

It was so long ago that I've forgotten most of it. I was impressed that it was based on evidence based literature. Here is a link to the training now https://carpentries.org/instructor-training/ I am disappointed that I don't see a reading list.

Unless it's changed since I was active, The Carpentries does not monetize content.

I signed up for software carpentry instructor training at the SciPy conference in 2015. I expected to learn about their curriculum. Instead, I found that they taught pedagogy. There were articles to read in advance. I should have taken that class before I spent 15 years teaching at university rather than afterwards.

When I worked at Los Alamos, the head of counterintelligence was a former CIA ops guy. He seemed warm and intelligent; just an all around good guy. In presentations, he explained that his job at the CIA was to exploit that appearance to ruin people's lives. He said his approach was to gain the trust of a mark, and then provide him with what ever was required to get him to betray things he loved. The presentations were effective, enlightening and spooky.

So, I agree: All spies are bastards.

This article was in Springer's The Mathematical Intelligencer in 1980. The next article in that volume was "Strange Attractors" by David Ruelle. When I read Ruelle's article in the early 1980s, I noticed Knuth's article. By the time I got to writing my third paper on strange attractors in 1988, I was using TeX.

Helium will leak out of some structures that hold methane. Shale will trap methane and let helium escape. Layers of salt trap both. Thus horizontal drilling and fracking to recover oil and methane from shale produces very little helium.

Tracy Kidder's father and grandfather (Henry M. and Henry M. Jr.) were partners in the law firm that's now Seward and Kissel. My great grandfather was a partner in the firm when he died in 1935. I've heard that everyone liked and admired my great grandfather. The Kidders took care of his descendants for the next say 65 years. In 1977 when I got a Bachelors degree in Physics, HMK Jr. wrote a will for me. We met at the Seward and Kissel office to get it signed and notarized, and HMK Jr. took me to lunch at a fancy club downtown. After some martinis, he told me that there'd been two generations of losers in my family, and that everyone thought with my degree in Physics, I could pick up the mantle.

Then he said that he wished his son, Tracy, had an interest in real science like me. When I asked what Tracy was doing, Henry described a silly project of hanging out with computer engineers.

I enjoyed "The Soul of a New Machine" when it came out. I always hoped that I could meet Tracy someday. I guess not. He did great work, I hope his father learned to be proud.

Thank you for articulately describing an ugly part of the world of science that I've seen over the last 40 years. I appreciate your "There but for the grace of God" thought. If I were a bigger star, I can only hope that I would have behaved better than some of those big stars.

After free UNIX and Linux became available on affordable home computers, I found it was no longer necessary to be at a company to do interesting projects. That was before 1995.

Encouraged by the replies here, I tried to get quickemu to setup macOS on my AMD based desktop. The emulated machine crashed trying to boot macOS, and I gave up after a couple of hours.

I thought that macOS was proprietary, and that apple only allowed it to be run on apple hardware. Just last month, I used incus to test a software package in 6 Linux distributions. I want to also test the package in macOS. Must I get a license from apple to do that with Quickemu?

I'm polishing up the second edition of "Hidden Markov Models and Dynamical Systems." The book explains several state space models and connects them to ideas about chaos. Here's a link to a pdf draft: https://www.fraserphysics.com/book.pdf and here's a link to source for the book: https://gitlab.com/fraserphysics/hmmds Once you install the source software, you can build a pdf for the book by typing "make book". I think that makes it reproducible research.

Yes! There's more oil in the ground than we should ever burn. The places where it's cheap to get out are ruled by unpleasant people. Shale limits the price they can charge. Yea shale. However, low prices encourage putting CO2 in the air. Boo shale. I wish we would find a better way to reduce use than paying unpleasant people high prices.

I read the NY Times article about this earlier this morning. I thought it was not very good. I came to HN to see if it had something better. It did. The linked article is also at something like a high school level, but it gave me (retired PhD Physics) a good idea of the experiment and the theory. Thanks.

Please take a look at the most recent draft of my book "Hidden Markov Models and Dynamical Systems" https://www.fraserphysics.com/book.pdf In the first chapter I talk about a chaotic model for laser dynamics, and in the last chapter I use the same ideas to analyze ECGs.

The code and text are at https://gitlab.com/fraserphysics/hmmds. From a Nix command line, "make book" builds the book in about 10 hours.

I'd be grateful for any feedback on the book or the software.

I think it was Larry Summers.

One way to characterize the cost of cooling is entropy production. As you say, cooling is proportional to difference in temperature. However, entropy production is also proportional to temperature difference. It's not my field, but it looks like an interesting challenge to optimize competing objectives.

I started getting migraines in the 1960s. Thanks for the link.

While a cup of coffee often helped me feel better in years past, I've found eliminating coffee from my diet has reduced my headache frequency. Triptans help when I get the occasional headache now.

I was disappointed that the article didn't talk about the variety of migraine manifestations. Some of the manifestations can be confused with transient ischemic attacks.

I think the result for Gaussian channels is in R^n.

Don't Shannon's channel coding theorem and rate-distortion theorem establish bounds on possible sphere packing?

Thank you for your reply.

I am also not a doctor. I have an appointment with a specialist MD. My PCP was initially alarmed, but after some research and consultations believes that I am not in immediate peril.

Unfortunately the devices that those links point to would not provide 24 hours of continuous data. The data that Phillips won't give me is a continuous record of about 720 hours with a few small breaks. The interesting event was one 2 second interval in the middle of one night.

The units of resistivity are ohm * cm not ohm/cm. (I worked at Fairchild a long time ago.)

Here are a couple of related jobs that could be in a movie:

1. Disabling a terrorist weapon. When you find a mysterious box in NYC making ticking noises and emitting radiation, who you gonna call?

2. Forensics and attribution. When 1 fails how do you figure out what happened and who is responsible?

Also cool would be the inverse. Going from ECG to plausible simulated RD dynamics.

I am reworking the analysis of ECGs from an old contest, and I want help from an expert.

In 2000 the Computers in Cardiology challenge (CINC2000) provided ECGs from sleep studies of 70 patients and asked contestants to identify obstructive sleep apnea based on those ECGs. I was on the team that won.

Now I am reworking the problem for the second edition of a book (see https://www.fraserphysics.com/book.pdf), and I see great variety in those ECGs (see https://www.fraserphysics.com/all_ecgs.pdf). I suspect that some of that variety is due to lead placement, and some is due to pathology, but I'm not sure.

Is anyone here willing to help me out?

Consider https://en.wikipedia.org/wiki/Fraser_Mansion. My great great grandfather lived there till he jumped to his death from Brown's Hotel in London. See Richard Cory.

"Arithmetic coding for data compression" by Witten Neal and Cleary. 1987. https://dl.acm.org/doi/10.1145/214762.214771 It explains that all that's left to work on for better lossless compression factors is better (higher likelihood) models of sources. It provides C code and a good explanation of arithmetic coding.

If you need to detect anomalies as soon as they occur, that seems right. But if you want to detect them later you can also combine back-casting with forecasting. Like Kalman smoothing.

I agree with the article, and I find many of the comments here insightful. Relationships with some of my old school adversaries were healed when they attended my son's funeral.

The movie Charade is sort of about the bad effects of a poorly attended funeral. See https://www.youtube.com/watch?v=a8FA5zBHiFA