117,172 reputation
5183313
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 11 months
seen 9 hours ago

Semi retired old time computer nerd who started programming on a Commodore Pet.

Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.


2d
reviewed Reject Prove the relation between relative velocity ,momentum and energy
2d
reviewed Reopen Force of a Train
2d
reviewed Reopen Can diffraction be used like gravitational lensing
2d
reviewed Close Critical engine failure just after rotation: what percent of accelerated slipstream lift does the wing loose?
2d
reviewed Close Short Wave UV lamp
2d
reviewed Close Why is rho to two pions not allowed?
Dec
18
awarded  Nice Answer
Dec
18
answered Angular Momentum conservation in star system
Dec
18
reviewed Leave Open Can diffraction be used like gravitational lensing
Dec
18
answered How do we find the accuracy of atomic clocks?
Dec
18
comment Can diffraction be used like gravitational lensing
Tom's answer explains nicely how diffraction can be used to create a lensing effect. Note however that image formation by diffraction is entirely different from gravitational lensing. Not only are the mechanisms unrelated, but even the end results are different as gravitational lenses have a focal line not a focal point.
Dec
18
answered What are galactic speeds measured against?
Dec
18
comment Vapour from a vessel's opening?
This question appears to be off-topic because it belongs on the Chemistry Stack Exchange.
Dec
18
comment How does light speed up after coming out of a glass slab?
Re the equations, see this post.
Dec
18
comment Can spin angular momentum be understood as orbital angular momentum in extra dimensions?
Sadly that's behind a paywall ...
Dec
18
comment Can spin angular momentum be understood as orbital angular momentum in extra dimensions?
Is it true that mass is linear momentum? My recollection is that the tower states are effectively standing waves of decreasing wavelength around the extra dimensions, and the mass is simply the energy of the standing wave. I have a vague recollection that angular momentum round a compact extra dimension looks like a charge.
Dec
18
reviewed Approve boundary conditions
Dec
18
reviewed Approve Question regarding the Bohm interpretation
Dec
18
revised Time ordering, interaction Lagrangian calculation, QED
Tidy equations
Dec
18
reviewed Close Practical Book on Hamiltonian and Lagrangians?