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12453
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location Vancouver, Canada
age 45
visits member for 4 years, 4 months
seen 2 days ago

VP Research&Development at an image guided surgery startup.

Mostly do C++,python,image processing,machine vision - anything with lots of 3D,maths and data. Background is experimental physics and optics.


Jul
26
comment Can we extract positrons from gamma rays?
yes, the problem is more likely to be getting a strong enough source of gamma rays
Jul
25
comment How power lines use high voltages with a low current?
@RJSmith92 the V in the question is the voltage difference along the cable = "wasted" voltage. By having a high voltage/low current cable then with a given R you have a low V difference = low wasted power.
Jul
19
comment Do all stars Turn into Black Holes?
physics.stackexchange.com/questions/99375/…
Jul
18
comment How easily can the Earth flip?
@punkerplunk the rotation kinetic energy of the Earth is around 10^29J that's a lot of energy - leaving aside the lack of a mechanism for transferring it.
Jun
4
comment Why can't LIDAR be implemented with traditional antennae?
Yes that's true, with enough power and a poorly matched impedance you could make the antennae emit visible light - fairly briefly
May
14
comment Saturn V F-1 engines and beyond
If you only care about peak power then Project Orion en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion) is probably the winner
Apr
24
comment Can we find the exponential radioactive decay formula from first principles?
@dmckee it's unavoidable if the decaying nuclei are independent. If there was any field between atoms you could have a different law.
Apr
22
comment Car motor heat to drive a steam engine
en.wikipedia.org/wiki/Automotive_thermoelectric_generator
Apr
22
comment True randomness via Radioactive decay
yes, yes, and physics.stackexchange.com/q/105107
Apr
20
comment Measuring depth or height from sea level
It's a famous problem science20.com/news_articles/…
Apr
19
comment Is electric current a scalar quantity?
@ACuriousMind - good point, I was think in terms of the question
Apr
19
comment Single particle passing through the double slit at a time
@JohnRennie - I think the question is slightly different, the OP is confused about why you need a single photon. And I think it's useful to have some different answers to the same question at different levels.
Apr
17
comment Why does the lake surface appear darker in some areas?
@GreenAsJade, yes I thought I made that clear, it was just an example.
Apr
16
comment Why does the lake surface appear darker in some areas?
In this image I suspect the lighting difference is totally from the surface, it is at such a low angle of incidence and the water is probably heavily sedimented (guessing from the location)
Apr
9
comment Why do snorkelers not need to wear corrective glasses when snorkeling with goggles on?
Also under water you can't see as far, visibility is at best 10m, and you aren't reading road signs or anything else in detail - so "in focus" is a bit less strict
Mar
26
comment Refraction of light marching band analogy
@JeroenMoons - how does the light know is possibly the most fundemental question in physic! One suggestion is that all paths are tried in multiple universes and we end up in the one with the shortest path. And that is one of the more 'sensible' suggestions
Mar
11
comment How nuclear fission works in power plants?
Read en.wikipedia.org/wiki/Nuclear_fission then ask any questions here
Mar
4
comment Scientific Laws for Engineering Materials
You could argue that purely descriptive laws like Hooke's which just describe an observation but don't offer any explanation are different from some fundamental theory which predicts effects. But I don't know what you would call them other .
Feb
18
comment How can we count 17 particles in the standard model
I think it's more that there are 17 known particles which constitue the standard model - rather than the standard model predicts/requires exactly 17particles.
Feb
18
comment What is the relationship between the Young's modulus of a material and the elasticity of a free fall collision
@fffred it wouldn't rebound because it couldn't store the potential energy in deformation. It's one of those silly unmovable object vs irresistible force questions