40,889 reputation
356130
bio website inspirehep.net/…
location Duchy of Grand Fenwick
age 44
visits member for 4 years, 7 months
seen 24 mins ago

Experimental nuclear and particle physicist. These days I'm teaching, but I've spent a lot of time on nucleon structure in fixed target electron scattering and neutrino oscillations using reactors and beam sources.

Been reading Zemansky & Dittman's book on thermodynamics recently. Quote: ``The concept of temperature is rich in interpretations and levels of abstraction.'' Nice.


Jun
23
comment X-ray characteristic radiation
Or somethimes they have to moonlight ... taking part-time jobs in several atoms that form a vertical trust^W^W benzene ring.
Jun
23
comment How are Dual-energy X-ray absorptiometry (DXA/DEXA) scans affected by surface stability?
As far as I'm concerned this is framed in a way consistent with an experimental error analysis question and is fine for the site, but ... I don't know that we have any regular users who are sufficiently familiar with that kind of kit to give you a good answer.
Jun
23
comment Ideal energy to study higgsstrahlung at a lepton collider
No time to write a real answer. The core problem with setting up right at threshold is that the phase-space available to the products is very small.
Jun
23
comment Is it possible to reach outer space with this method?
Related: physics.stackexchange.com/q/29889 physics.stackexchange.com/q/45454
Jun
23
comment Reactor for electrical energy design base assumption inefficient?
Understand that I think there are some worthy if basic elements here, but that the framing of the question in terms of "Here is may layman's opinion has anyone else noticed this?" is problematic. Of course, people have noticed that; smart people have spend decades and many millions of dollars nibbling away at it. Big fixed gas turbines used for power generation come closer than any other mad-made engines to realizing their theoretical Carnot efficiency.
Jun
23
comment Reactor for electrical energy design base assumption inefficient?
I actually find this question to be rude in the sense that it carries an unwritten assumption that the (multi-billion dollar a year) power industry has been going along not thinking about what they are doing for the last century. Really? There are R&D engineer who spend their entire careers working on a single aspect of this problem.
Jun
23
comment Proof of Thevenin and Norton theorem
For your information, Physics.SE has a policy that it is OK to cite oneself, but it should be stated clearly and explicitly in the answer itself, not in attached links.
Jun
23
awarded  Nice Answer
Jun
23
comment Spectroscopy from a classical light wave or photon only?
The wave picture of scattering at the atomic level isn't really well suited to "a little introduction" At bigger scales the Huygens-Fresnel infrastructure works pretty well. Pick any physics text on optics.
Jun
22
comment Calculate Time travel with Time Dilation
"person A moving at a speed of 0;" Anytime you write "at speed" in relativity without saying (or at least meaning) "relative to ..." you are making a mistake. In this case the mistake is implicitly privileging your own frame of reference above others. That is wrong and misses the whole point.
Jun
22
comment Question on units for integrating F vs x graph
What are the units of the slope? What does that make the units of function?
Jun
22
comment Can we find actual rest mass of things on Earth
"We're moving at 627±22 km/s relative to the reference frame of the CMB." Is good. "Or relative to the universe as a whole." suggests a that the CMB defines a privileged frame and it not good.
Jun
21
comment Mechanism of failure for sudden application of force with no supports?
This would seem to be an explicitly dynamic process, so you should be looking for dynamic bench tests, as opposed to the more usual test in which stresses are slowly increased rending the test essentially static.
Jun
21
comment How do Cooper pairs form?
The answer is fundamentally quantum mechanical. Are you familiar with the mathematical infrastructure of writing multi-particle states in QM?
Jun
21
comment Effect of dark matter on measuring our weight
If you mean the first sentence to imply that "We know that 95% of the matter [...] in our room is dark matter", then this is not correct. That is only true on large scales---like that of the galaxy. Cue the usual Douglas Adams quote about the size of space and the distance down the road to the chemist's.
Jun
21
comment Why is Cosmic Background neutrino radiation at 2 kelvin
There seems to be an unstated assumption that the C$\nu$B should be similar to the CMB, but there is no reason to think that. I'll leave a cosmologist to answer the question in detail, but the neutrinos decoupled at a different (earlier) time than the photons and the is no reason for their (initial temperature)-times-(cooling due to expansion) to be the same as that for the photons.
Jun
20
comment A simple detailed book on how/why model rocket engines and parachutes work
How do rockets work? Get a skateboard and a 4ish kilogram exercise ball. Place the skateboard on a level surface, mount, balance and throw away from where you want to go.
Jun
20
comment What is “forward peaking”?
related: physics.stackexchange.com/questions/26507/… physics.stackexchange.com/questions/135162/…
Jun
20
revised What is “forward peaking”?
edited tags
Jun
19
comment “Rotating any system of charges causes a corresponding rotation of the electric field.”- What is the proof?
A subtle approach to this question would be to consider that "rotate" could mean either a alias or alibi transformation and that the physics result can't depend on which you chose...