fraserphysics

8 ms·

1.
by fraserphysics 5d ago
I don't know how societies set "primary goals". After spending 15 years in a tenure track -- tenured position, I thought setting goals well was important. I take pleasure in how mathematics and science help me understand the
2.
by fraserphysics 21d ago
Yes! US agriculture (Mostly a red state industry) needs potash. Google AI says that most potash comes from (in order) Canada ("is the primary global exporter and supplies nearly 80% of U.S. imports"), Russia, Belarus, China, and
3.
by fraserphysics 22d ago
I had a summer visiting professor job at Intel at the time doing signal processing. They set me up to use MatLab under Windows95. I installed Linux and code from Numerical Recipes to get around various limitations. Andy Grove had just ba
4.
by fraserphysics 27d ago
That seems like a good idea to me. No matter what the owner says, I would want to know about the incident if I were providing liability insurance on the vehicle.
5.
by fraserphysics 1mo ago
Sort of related. Across the street from my cousin's house in Portland, OR, a car ran over the curb and into landscape features that knocked off the car's bumper and license plate. The perpetrator then backed up and drove away.
6.
by fraserphysics 3mo ago
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.
7.
by fraserphysics 3mo ago
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 i
8.
by fraserphysics 3mo ago
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 disappointe
9.
by fraserphysics 3mo ago
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
10.
by fraserphysics 4mo ago
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 r
11.
by fraserphysics 4mo ago
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 ar
12.
by fraserphysics 5mo ago
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.
13.
by fraserphysics 6mo ago
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 lik
14.
by fraserphysics 7mo ago
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 w
15.
by fraserphysics 7mo ago
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.
16.
by fraserphysics 9mo ago
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.
17.
by fraserphysics 9mo ago
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 l
18.
by fraserphysics 9mo ago
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:/&#x2F
19.
Show HN: Markov Models and Dynamical Systems – Software and Book(gitlab.com)
4 points by fraserphysics 10mo ago|0 comments
20.
by fraserphysics 11mo ago
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
21.
by fraserphysics 11mo ago
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 (retir
22.
by fraserphysics 1y ago
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
23.
by fraserphysics 1y ago
I think it was Larry Summers.
24.
by fraserphysics 1y ago
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
25.
by fraserphysics 1y ago
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
26.
by fraserphysics 1y ago
I think the result for Gaussian channels is in R^n.
27.
by fraserphysics 1y ago
Don't Shannon's channel coding theorem and rate-distortion theorem establish bounds on possible sphere packing?
28.
by fraserphysics 1y ago
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 tha
29.
How to get my ECG data?
1 points by fraserphysics 1y ago|3 comments
30.
by fraserphysics 1y ago
The units of resistivity are ohm * cm not ohm/cm. (I worked at Fairchild a long time ago.)

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