38,234 reputation
353126
bio website inspirehep.net/…
location Duchy of Grand Fenwick
age 44
visits member for 4 years, 4 months
seen 41 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.


May
20
reviewed Approve Friction on a conveyor belt
May
20
reviewed Approve Manufacturing Fresnel Lenses with Sound
May
19
comment What are the implications of the Nesvizhevsky experiment and followup experiments with ultracold neutrons?
@MrX I've edited the link into your post which is better than putting it in the comments. I've also linked to the arXiv abstract page which is generally preferred to giving a PDF link, as many user will want to read the abstract before deciding to download a PDF and the abstract tracks versions updates by default and provides access to the version history.
May
19
revised What are the implications of the Nesvizhevsky experiment and followup experiments with ultracold neutrons?
added 56 characters in body
May
19
comment What is the result of applying a fourier transform n times to a distribution?
Is there anything not well explained by the Wikipedia section on invertibility and periodicity of the Fourier transform?
May
18
comment Can we measure “wavefunction” of quantum particles?
Duplicate of physics.stackexchange.com/questions/10240/…?
May
18
comment When (Exactly) Does Bremsstrahlung Radiation Occur?
To emphasize what Peter has said, this is a quantum mechanical process. Of course it is ruled by probabilities.
May
18
comment Can a current carrying loop or wire produces no magnetic field?
It is typical in actual application to use either twisted pairs or coaxial geometry both of which have some advantages over a side-by-side pair geometry.
May
18
revised Why does kinetic energy increase quadratically, not linearly, with speed?
strip out selfpromotion
May
18
revised Can general relativity be completely described as a field in a flat space?
Remove meta discussion aimed at the mods.
May
18
comment How can I determine whether the mass of an object is evenly distributed?
@AlexSu As I said in the comments on the main question the ringing spectrum would be different when struck. I don't know of a off-the-shelf piece of software to work the problem for you but the problem is not terribly difficult.
May
17
comment How can I determine whether the mass of an object is evenly distributed?
Come to think of it, if you have some perfect examples to use for comparison, the ringing behavior under a well defined impact is powerful test that can be done with quite simple tools. A repeatable drop mallet and a PC with good microphone might be enough...
May
17
comment How can I determine whether the mass of an object is evenly distributed?
@BenCrowell Well, ultrasound would detect the difference in may example, but does Alex's "typically lab equipment" include ultrasound? On the other hand, if the ideal object rings nicely when hit by a mallet my construction is probably detectable that way.
May
17
comment How can I determine whether the mass of an object is evenly distributed?
In less symmetric arrangements the near field gravitational effects could differ, but this being a malicious case, I've made it maximally easy for me and maximally hard for Alex. Bhawhawhawhaha! ::dons turban with point in the middle::
May
17
revised How can I determine whether the mass of an object is evenly distributed?
added 33 characters in body
May
17
answered How can I determine whether the mass of an object is evenly distributed?
May
17
comment How can I determine whether the mass of an object is evenly distributed?
I think this is very difficult if you admit pathological or malicious cases. Pipe-fitters and shipbuilders and the like make heavy use of x-ray and gamma-ray imaging, sonic imaging and other "non-destructive testing" techniques. It's a big field in it's own right.
May
17
comment How can I determine whether the mass of an object is evenly distributed?
Doesn't really address any of the hard cases.
May
17
comment Interpreting the results
You do know how long ... you said the TDC intervals were $10\ \mu s$ each, and you choose how to group them. And @Lagerbaer is right because you want an answer in time units you should have the data in time units.
May
17
revised Interpreting the results
edited tags