The untagged tag has no wiki summary.
-3
votes
0answers
38 views
Looking for thin foil filters/indicators/sheets [closed]
I am looking for a few interesting sheets of foil with special properties.
For example, Magnetic paper, solar filter paper, diffraction grating foil.
I also know that there is a thermal paper that ...
0
votes
0answers
12 views
Separating waves of very close wavelengths [migrated]
I'm new to wave problems, so excuse my simplified words.
I have a signal consists of high range of frequencies . I applied a Band-pass filter to this signal and I have been able to separate it to ...
2
votes
0answers
103 views
Explosively Pumped Flux Compression Generator = EMP strong enough to destroy my phone from a mile away?
http://en.wikipedia.org/wiki/Explosively_pumped_flux_compression_generator
Explosively Pumped Flux Compression Generator detonated a mile away or so, what damage would be done to my phone, and other ...
-5
votes
1answer
80 views
Where did the formula $Φ(x,y,z) = x^3y - z^2$ come from? How does it define a scalar field? [closed]
I want to ask that why $Φ(x,y,z) = x^3y - z^2$. I don't understand this relation? Can someone make sense of this equation.
1
vote
0answers
123 views
How to derive a multi-reflection echo from a given single-reflection “trace”
Consider a one-dimensional semi-bounded "ray" (or thin "cylinder") of stratum (or just any homogeneous substance) which has several "features" along it's length (say, thin films). Consider a wave that ...
3
votes
1answer
320 views
Neon lamp: minimal breakdown voltage
I am looking at this formula:
from wiki for brakedown voltage in gas discahrge lamps, and I see it's linear by length (d) (ops, I see it's divided by ln...).
Does that mean that I can make tiny ...
1
vote
1answer
111 views
Does white phosphorous burn in ammonia? [closed]
In tonight's session of a science fiction role-playing game, I used a white phosphorous grenade against a group of ammonia-breathing aliens on their home turf, and I must confess that neither the GM ...
6
votes
2answers
557 views
Can someone give a simple expose on Coleman Mandula theory and what Mandelstam variables are?
Coleman-Mandula is often cited as being the key theorem that leads us to consider Supersymmetry for unification. An overview discussion with sufficient detail is missing in many popular texts. So ...
