14,236 reputation
1642
bio website
location Vancouver, Canada
age 44
visits member for 3 years, 1 month
seen 28 mins ago

Mostly C++ programmer in Vancouver.
Specialising in image processing, 3d modeling, Lidar - I'm really a physicist


Jul
18
answered Which current big Earth-based telescopes are equipped with adaptive optics?
Jul
16
comment Mirror “roughness”
For example the HST mirror was wonderfully smooth - it was just perfectly smooth to the wrong shape
Jul
12
comment People eating and gaining energy
Of course if you are trying to do enough exercise to counter the energy input of the chocolate bar then your body is a depressingly efficient machine
Jul
12
answered Why is electricity not transmitted wirelessly?
Jul
11
comment Calculating time for a fully charged UPS
Unless they are special deep discharge batteries (ie just cheap car/alarm lead-acid) you can typically only take 50% of the rated capacity without damaging them.
Jul
7
comment Are human eyes the best possible camera?
I believe squid eyes manage it, our just happened to evolve from light sensitive pits and sort of got turned inside out
Jul
6
comment Are human eyes the best possible camera?
@joe, not building it back-to-front would be a good start! Your eye has the sensitive layer on the back, the wiring on the front and the data cable coming out of the middle of the front!
Jul
6
comment Why stay in the car during thunderstorms?
There is also a danger of secondary strikes, if the grounding of the pole or it's conduction isn't perfect, or there is a sharp point on the pole near you - there may be a better path formed from an arc from the pole through you to the ground. That's how a lot of people near trees get zapped.
Jun
30
comment Observing lunar lander and footprints on the moon?
@Carson, there is one in Germeny and another in Puerto Rico that is 300m in diameter.
Jun
30
revised On a bicycle, why does my back tyre wear so much more quickly than the front?
fixed typos
Jun
30
suggested suggested edit on On a bicycle, why does my back tyre wear so much more quickly than the front?
Jun
29
comment Why don't modern spacecraft use nuclear power?
Power - RTGs typically give you 200-300W the solar panels on Hubble generate nearly 3000W
Jun
28
comment how does human brain compare to a modern CPU in energy per bit?
"somewhere between 10^−9 and 10^9" - a theoretical physicst at work!
Jun
27
comment What are the prerequisites for considering any other planet to be habitable?
Similarly you aren't going to get free oxygen unless there is life around. Any planet with a chemistry to allow free oxygen to be present, without some equilibrium disturbing life, is going to be pretty hostile to life!
Jun
25
answered Given that matter cannot escape a black hole, how did the big bang produce the universe we see today?
Jun
24
comment What is exactly a Dobsonian, and what are the differences when compared with Schmidt-Cassegrain or Newtonian?
The idea of a Dobsonian is to spend all the money on the mirror and build the simplest possible mount - so giving you the most photons/$
Jun
24
answered What is the simplest way to prove the Earth is round?
Jun
24
comment Space Interferometry Mission (SIM) cancellation
An economist would probably argue the opposite - you took a large number of highly skilled people out of the work force. It's the 20th century equivalent of forcing farmers to build pyramids during the harvest instead of the rainy season!
Jun
22
revised Direct exposure to the vacuum of space
added 417 characters in body
Jun
22
answered Direct exposure to the vacuum of space