Green Definition and 306 Threads

As Iran continues to develop nuclear power for peaceful purposes, many people have expressed concern that a nuclear weapons program might emerge. http://www.cfr.org/publication/16811/ President Obama has acknowledged they have a legitimate right to pursue peaceful energy development...

Hey, I was wondering if anybody knew a more intuitive, less axiomatic book that one could use as a companion text to the "green\papa" rudin? (Real and Complex Analysis). I am finding that it is possible to learn measure theory from this book, but it takes a lot of time and rigor. It might be...

I am a cabinet maker, and recently, I have had a lot of demand for E0, as they learn that Formaldehyde emissions from many building products are hazardous to your health. "Sources of Formaldehyde Pressed wood products (hardwood plywood wall paneling, particleboard, fiberboard) and...

Hello, I have a question for the astronomy people here. Last night I was outside around 10 P.M, and at one point I just happened to be staring up into the western sky when I saw one of the brightest, most beautiful meteors I have ever seen. The weird thing is that it had a faint green tint to...

I saw some green lasers on dealextreme recently, they have units that go up to 200 mW: http://www.dealextreme.com/details.dx/sku.1997 This thing looks a bit unsafe to me! My intention is to show the daughters some stars here in our polluted skies, not much else. How much power is needed for...

Does anyone know what sorts of opportunities are out there for CE's in Green Energy (such as solar and wind)?

Which engineers are working the most on sustainable energy such as wind, solar, and hydro? I'm guessing mechanical and electrical. Any other ones?

Homework Statement Of 27 students in a class, 11 have blue eyes, 13 have brown eyes, 3 have green eyes. If 3 students are chosen at random what are the odds of the following occurring? Only 1 has green eyes.Homework Equations Odds = P( s )/P( f ) = P( s )/( 1 - P( s )) Probability success = P(...

Homework Statement Monochromatic green light of wavelength 546 nm falls on a single slit with a width of 0.095 mm. The slit is located 75 cm from a screen. How wide will the central bright band be? Homework Equations D sin 0dark = m 入 The Attempt at a Solution Can...

Homework Statement what color does a green cloth appear in yellow light Homework Equations The Attempt at a Solution i know its either green or black but i don't know which. Yellow light is either a wavelength of its own or a mixture of green and red, that's where my problem is...

Basically I wanted to teach myself about light and I have a question that i am not to sure about basically I know about the spectrum of light but I also know that two primary colours make a secondary color. yellow is either is own wavelength or its a mixture of green and red, so here's my...

Homework Statement How many photon/s are emitted by a green light (λ= 500 nm) 60 W incandescent bulb? Assume an efficiency of 2%. Homework Equations c= wavelength(f) c=speed of light E=hf The Attempt at a Solution im not sure which equation to use here, i don't know what to...

Hello. I'm planning on building a green house in my garden with a wind powered heating element to help sustain higher temperatures. I live in a windy area (North Sotland) so wind prevolance is no problem. Would an element be the best way to this or are there better methods of converting...

This snapshot was sent to me from somewhere near the Cotton Bowl this morning. http://i210.photobucket.com/albums/bb29/jellyroll2008/friedtomatoes.jpg mmmm..MMM! I'd kill for some fried green tomaters.

Happy Birthday Borek!

Last night we had the most bright and beautiful sunset I ever saw look at the color of the clouds The start of a green flash? And later in the evening:

According to the History Channel documentary How the Earth was Made (DVD), Earth's early oceans were green, b/c of their (different) chemical composition. For example, they had more dissolved Iron, and CO2. CONCLUSION: Earth Early Lifeforms were confined to the Oceans, for lack of an Ozone...

Remember the X Prize Foundation? In case you forgot, the X Prize Foundation is the group that awarded the $10000000 Ansari X Prize to SpaceShipOne four years ago:http://space.xprize.org/ansari-x-prize. Has anyone seen the new video-submission contest to determine the X Prize Foundation's...

Hi Everyone, My teacher gave me a project to created anything that need not to be build out physically. I gave the tittle green planet. So the idea is that one could create a VACUUM tunnel from the north to south pole (or any 2 points that is a diameter of the earth) and a "vehicle"...

I just bought some pepper. I didn't know what kind to get so I bought the kind that has its own grinder built in. Then I had to chose between the black peppercorns or the peppercorn medley. I got the medley and it has black peppercorns, pink peppercorns, white peppercorns and green peppercorns...

Entropy is said to always increase. But do not green plants reverse entropy? Seems to me that everything they do increases order, down to the molecular level.

Hello, I have a high power RGB LED with common anode. I want to have 3 of them in series, and put them on 15V power supply. And I want to switch green color on, and red color as well (something like a normal traffic light) Here is the problem: Given that three LEDs are in series, and are...

Stars seem to occur in almost every color, from red to near violet, but not green. Why are there no green stars?

Hello, I don't fully understand the meaning of Green function, and how one should use it. According to Jackson's "Classical Electrodynamics" - 'the method of images is a physical equivalent of the determination of the appropriate F(x, x') to satisfy the boundary conditions'. Where Green...

i am having problem in calculating pKa in my experiment,a formula of pKa=pH + log10 [HB]/[B] my data obtain only gotthe pH of HB,that is 5.17 how can i calculate the pKa?? [HB]=concentraion of undissociated form indicator [B] =concentration of dissociated indicator

Homework Statement Iron produces many lines in the visible spectrum when given energy. Suggest why a sample of iron sulphate only produces lines in the green section of the spectrum. Sorry if it doesn't sound very scientific, I am recalling the question from memory since I've already handed...

Hey folks, I'm trying to find the Green function for the equation -\partial_\mu \partial^\mu \phi = K where K is some source term. Its a 2D problem with the wave confined to a rectangular cavity where the cavity is located at z = 0 and z=a. This tells me that G|_0= G|_a=0 I've pretty...

If I subscribe to this service, I get my electricity from solar and wind power. But how do I know I'm getting green electrons into the meter?

Hey folks, I'm not really sure which forum to put this question in but I figured this was probably the best as it deals with issues of regularization. I'm reading Miltons 'The Casimir Effect'. In chapter one he derives the Casimir energy for a massless scalar field by employing...

Hey folks, I'm trying to get a handle on my old Nemesis, Green functions. I have a massless scalar field confined between two parallel plates separated by a distance a (in the z dimension) and the field satisfies Dirichel BC's. Basically I'm trying to work from line 1 of a book to line 2 (K...

Suppose \phi is a scalar function: R^n\to R, and it satisfies the Poisson equation: \nabla^2 \phi=-\dfrac{\rho}{\varepsilon_0} Now I want to calculate the following integral: \int \phi \nabla^2 \phi \,dV So using Greens first identity I get: \int \phi \nabla^2 \phi \,dV = \oint_S \phi...

Red light mixed with green light produces yellow light. Yet, a red photon and a green photon don't combine to make a yellow photon (or two of them). Can someone explain this?

Homework Statement Negelcting internal heat sources, the surface Temperature of the Earth is calculated to be 255 K. Its actual mean surface Temperature is 288 K. The additional heating results from the greenhouse effect. Regarding this as an internalk heat source, calculate that heat source...

https://www.greenbags.com/?cid=402572 On face of things this claim sounds reasonable to me, but really I have no idea. They claim to be good for ten uses.

Homework Statement A mixture of red light (wavelength vacuum = 652 nm) and green light (wavelength vacuum = 477 nm) shines perpendicularly on a soap film (n = 1.333) that has air on either side. What is the minimum nonzero thickness of the film, so that destructive interference removes the...

find the eigenfunctions and eigen values of the next equation: d^2y/dx^2+u_n^2y=0 where y(0)=0=y(pi). Now find the green function of the above non-homogeneous equation, i.e: d^2G_{\lambda}(x,a)/dx^2-\lambda G_{\lambda}(x,a)=\delta(x-a) where a is in (0,pi) and lambda doesn't equal the...

This week, people are free to interpret the theme as they wish, although some has taken it into a direction that I never thought of. So please vote for the picture that best represents our theme : Green Acres 1. larkspur 2. turbo-1 3. hypatia 4. BobG...

I need to find the green function of (\frac{d^2}{dx^2}-k^2)\psi(x)=f(x) s.t it equals zero when x approaches plus and minus ifinity. Now according to my lecturer I first need to solve the homogenoues equation, i.e its solution is: psi(x)=Ae^(kx)+Be^(-kx) and G(x,x')=\sum...

Green Acres Green acres is the place for me. Farm livin' is the life for me. Land spreadin' out so far and wide Keep Manhattan, just give me that countryside. New York is where I'd rather stay. I get allergic smelling hay. I just adore a penthouse view. Dah-ling I love you but give...

I am in the unique position of being able to implement ideas for green homes immediately for production. If you have any ideas that you would like to share, we will consider your ideas and may use them. It is a chance to help change the world a little bit. Yes I do benefit from this but not...

Not sure if this is the best place, but it's also my first post, so meta-answers about where I'm supposed to put this business are welcome too. I'm a physics student, and I'm interested in learning about Green functions, but I sold back the Boas book that I used for my math methods class (we...

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I am a physics major, what would be a possible route into green technology? What kind of grad school would I look too? Phd physics or engineering? And what would I specialize in at grad school ? I guess there are all kinds of technologies that could possibly be used ie: solar, hydorgen...

Glass is Green? when the glass is viewed at their edge , it looks green . 1.why it is green when viewed at the edge ? 2.Why its not green when we view other than the edge ? i think polarization is the effect but if so,how does it take place . please help me in this...

so how much of a **** do you actually give about the whole 'green' thing? is it really worth worrying about in your opinion? someone just sent me this http://www.guardian.co.uk/environment/treadlightly?CMP=OTCTreadLightly2 you register, they give you 'green' tasks to do, and you...

i am a total newbie here...i understand basic principles like supercooling, phase change, etc, but otherwise a total dummy, i have equivalent to 1st yr university in chem, but that was a long, long time ago. so go easy on me. i am trying to find out the difference btwn sodium acetate...

Give an example of a titration assay in which bromocresol green could be used. In your example give the concentrations of each component. Based on the conditions of the titration, calculate the pH at equivalence. Since Bromocresol Green has a pKa of 4.6, I figured that this must be a...

Hey folks! I'm starting with the Lagrangian of a massive scalar field and have found an expression for the expectation value of the energy-momentum tensor. <T_{\mu \nu}>=(\partial_\mu \partial_\nu-\frac{1}{2}(g_{\mu \nu}(\partial_\mu \partial_\nu+m^2))G(x-x') let say I have some Green...

Does anyone have one of those military grade green lasers that can set things on fire? I've seen people build them but I don't have a solder iron :(

Is it possible to burn anything with a 5 mW green laser?