Green Definition and 306 Threads

Hi everyone, This is my first thread so I'll try to be as clear as possible and try to follow the rules. My job is to synthesize silver nanoparticles, characterize them (TEM, DLS, EDAX, Z-POT), and then pass then on to the toxicologists. This is my thesis work to graduate. A new thing I have...

It's really just a dumb question about spinors. The book says that for N=1 SYM, in 3 or 4D we use Majorana spinors. In 6D we use Weyl spinors. And in 10D we use Majorana-Weyl spinors, so that the number of fermionic states matches D-2. My questions is, in 4D, Weyl spinors (chiral spinors)...

Homework Statement hey, i just wanted to know which line is stronger: orange, green or blue(i mean light which one has a stronger line? ) how would you know it? thanks in advance BA Homework Equations N/a The Attempt at a Solution I'm not sure how to approach it do...

hey, i just wanted to know which line is stronger: orange, green or blue(i mean light which one has a stronger line? ) how would you know it?thanks in advance BA pls delete this post I am going to post in homework help. sorryi posted it the wrong section:

Homework Statement need to find the green function for d^2X / dt^2 + 2 dX/dt +(1+k^2)X= f(t) with IV X(0)=dX/dt (=0) = 0 Homework Equations eq. attached The Attempt at a Solution attached whenever I try to solve the homogonous part, I get 0 due to the IV. guessing my...

This isn't even for the campus where I go to school, but as an amateur astronomer, I feel that this message should be spread everywhere. http://www.tdgogreenchallenge.com/video/p/1/playid/149/id/149/ Light pollution is something more than a nuisance to astronomers, it is also something that is...

Hi, This may be very specific - NIH fellowships generally require US citizenship or permanent residency. I am wondering if an approved I-140 is good enough to get through the door. Does anyone here know about this? Thanks.

What is the dark green mold on old white cheese called? is that penicillin?

I was setting up a 2.0 mW, unpolarized 543 nm (green) He-Ne laser today when I discovered something odd. I was using an iris diaphragm (like these: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=206) to align the beam parallel to the laser table. I found that if I placed a white...

We perceive blue light mixed with yellow light to be equivalent to green light. Does this have more to due with the way the wavelengths interact or some other physical phenomena or is it a biological phenomena

Since it obviously takes energy and extra amino acids to express the green fluorescent protein, so it's possible that bacteria expressing GFP might have slightly lower fitness (on average) than bacteria that aren't expressing GFP. I'm sure the effect is negligible in most cases. But maybe...

When we want to calculate the n-point function in the position space, it's always very difficult. For example, when we're calculate the 3-point function of \phi^3 theory in position space, we would get an integral \int d^4 z \frac{1}{|z-x_1|^2|z-x_2|^2|z-x_3|^2} It seems hard to integrate it...

Why is no green color on the sky at twilight??

This morning, I was lying on my bed, looking at the bright morning light coming in through the window. The blinds (which are white) were at least half shut, so much of the light was filtered through them. I then stared up at the ceiling, and saw a nebulous patch of green. I shut my eyes, and...

I have been trying to calculate how far a golf ball will travel on a level green given the following variables: The initial velocity of the ball is 1.49 m/s The coefficient of friction between the ball and the green is .0409 The mass of the ball is 0.046kg The diameter of the ball is 42.6mm...

Hi, I have this pretty cool 5mW green laser and I'm wondering if it is legal as long as I don't try to blind drivers and pilots.

On a recent reality show a young couple wanted to purchase a second home in the pacific northwest as a getaway. They claimed to be strong environmentalists and wanted a 'green' home. So what is wrong with this picture? I mean they can afford it so why not? Well there's nothing wrong with...

In studying the scattering problem, one should know green function in free space. while in two dimension, green function is the hankel function, seen in the attached file. bu i got confused in the second equation in the attached file. could anyone give me some details about this relationship? it...

The antenna cable tranfers only the 3 frequencies of green, red and blue, yes or no?

Question: Before it collapsed in 1989, Green Bank's 300-foot diameter telescope mapped the sky in H I. What was its resolving power? I believe the formula you would use is resolving power = (wavelength in microns) / (diameter in meters) So the diameter in meters would be about 91.44 m, but...

How is it possible to see the light path of a green laser pointer?

I was out in my backyard performing some astronomic observations for azimuth and latitude and was treated to a few of the recent meteors. I have seen a few different colored ones and it got me to wondering. I have heard of red, blue, white and other colored stars, but don't ever remember...

Well, at least this one is: http://www.myfoxphoenix.com/dpps/news/offbeat/pea-of-life-grows-in-ny-man's-lung-dpgonc-km-20100810_9112207

Hypothetically if your in a jet or spaceship & are shining a green laser pen out the window how fast must you travel to cause the green light (570 nm) to change into low energy blue light (475 nm)

Apparently this is a possibility: http://www.timesonline.co.uk/tol/news/world/middle_east/article7148555.ece The "stone age" monarchy terrified of the "stone age" theocracy! The real unknown is whether Obama would shoot down an IAF mission over Iraq en route to Iran. George Washington was...

There exists very simple formula for Green function for wave equation: G(t,x,t',x') = \delta (t-t'\pm \frac{|x-x'|}{c})/|x-x'| . I wonder whether there exist similar formula for Green function for Klein-Gordon equation (with mass >0) for any boundary condition.

I don't understand the green house effect. According to wikipedia, the green house effect is the result of non-directional re-emission of thermal radiation after being reflected from the ground from water vapor, methane, carbon dioxide etc., but shouldn't it cancel itself out? Shouldn't just as...

Hello guys, I got a question about one point in the Green's theorem proof that appears in Apostol's Mathematical Analysis, first edition, Ed. Addison Wesley. More exactly, in the theorem 10-42, immediately previous (and essential) to Green's (p. 287-289). Please, if this is too involved or...

which colour is brightest (red monochromatic light, green monochromatic light and blue monochromatic light )? and which light will give highest radiant flux? why? Thank you

By now i must be driving you guys crazy with my relativity questions , but this is my last one! i swear! =] Homework Statement A noted physicist was stopped by police for traveling through a red traffic light. The physicist argued that to because he was traveling fast, the colour of the...

Competition for algae? http://www.physorg.com/news144958975.html

So the latest thing I've seen being talked about is GEM*STAR (Green Energy Multiplier*Subcritical Technology for Alternative Reactors) http://nextbigfuture.com/2010/04/molten-salt-based-accelerator-driven.html They claim they are leveraging the ever improving efficiencies in producing...

On page 56 last paragraph Brian give example of a train paradox where two person have clock and there is two observer on on the train the other outside. They agree to set there clock at 12:00 when they see the light open witch is placed between them. From there perspective each clock will be...

as a student in physics, i cannot see the usefulness of green function to me, the definition of a green function is ugly and singular we have to deal with functions that are not smooth, e.g., the derivative is not continuous at some point. How these functions can be useful in math and...

im currently a freshman majoring in ME, and in the future want to work with (dont know specifically what yet) renewable energy, designing more efficient energy-harvesting systems, etc. but, i know there are tons of kids in my generation aspiring to do the same. is there a specific...

I was reading up on Classical Mechanics and the general method for solving for an undamped harmonic oscillator was given as \frac{d^{2}q}{dt^{2}} + \omega^{2}q = F(t) was solved using the Green function, G, to the equation \frac{d^{2}G}{dt^{2}} + \omega^{2}q = \delta(t-t') and then...

In my project, we enconter such kind of bessel's differential equation with stochastic source, like \Phi''+\frac{1+2\nu}{\tau}\Phi'+k^2\Phi=\lambda\psi(\tau) where we use prime to denote the derivative with \tau, \nu and \lambda are real constant parameter. how to get the green...

Why do almost all computer chips have green color? Like the RAM, microprocessor, motherboard are mostly of green color. Does this green color have any relation with the fact that chips are made of silicon i.e. are they green due to the presence of silicon? I've also seen brownish color...

Guys, how do u get the Fourier transform of a product of Greens Functions?I have to get Fourier transform of: G_{el}(k+q,\tau-\tau1)*G_{el}(k,\tau1) where \tau and \tau1 are two different times (\tau>\tau1) and q is phonon momentum and k is electron momentum... Thanks

The Earth rotates in inertial space. The amount of rotational kinetic energy is enormous ... millions of mankind's annual consumption. Is there any kind of apparatus, perhaps one based on gyros, that could tap into this energy?

green function and complex integration Homework Statement By reading this paper http://arxiv.org/pdf/hep-ph/0610391v4 I cannot proof the following relation on page 9 equation (23) , by a suitable choice of a contour in the complex omega plane: \int\frac{d^3 p}{(2\pi)^2}...

Hi sorry if this is very basic, I am an animal final year student and have come across a problem for my dissertation. I am looking at wavelength of light. Now the question, is a green bulb purely giving off green light, ie if it more blue green is it giving of predonimantly light of around 500...

Homework Statement In Jackson 3.16 we have to prove the expansion \frac{1}{\left{|}\vec{x}-\vec{x'}\right{|}}=\sum_{m=-\infty}^{\infty}\int_{0}^{\infty}dke^{im(\phi-\phi')}J_m(k\rho)J_m(k\rho')e^{-k(z_{>}-z_{<})} Homework Equations The Attempt at a Solution I tried to use the...

They don't look that way in the sky, but are there stars that look that way up close?

Hello forum, in the case we are in the time domain t, the Green function is a function of time. In the translation variant case, how do we express and separate the regular time variability of the Green function from the the time variability of its functional form? 1) What is the best...

1.Andre 2.ZapperZ 3.Borek 4.Marzena 5.Edward http://img529.imageshack.us/img529/5134/a0099bw8.jpg Contest Thread

Green living Interpret as you will. Contest Rules: 1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first. 2. Please resize your...

Where can I find problems with Tiablikov Green functions: G(x,x';t,t')=\theta(t-t')<[\hat{\mathal{A}}(x,t),\hat{\mathal{B}}(x',t')]> Thanks!

One of those green one inch thick garden knee pads is what i am talking about. If I sit my lcd monitor on one of these mats do you think it would be more stable? If you put a hard lcd base on a hardwood table I imagine it will not sit perfectly because of imperfections in the perfect...

is green better than red? Over the past couple of days, i seem to have noticed that sometimes, people like green better than red. I have been thinking about it and felt that it should be brought to discussion as to why green seems to be better. I know it sounds rather strange, but when you...