Generation Definition and 340 Threads

Homework Statement Let (X,\tau) be X = \mathbb{R} equipped with the topology generated by \EuScript{E} := \{[a,\infty) | a \in \mathbb{R} \}. Show that \tau = \{ \varnothing, \mathbb{R} \} \cup \{ [a,\infty), (a, \infty) | a \in \mathbb{R} \} Homework Equations A topology...

I want to estimate the efficiency of SFG in a BBO crystal for the situation when one pulse has much higher energy than the other (nJ compared to fJ), and the beams cross at an angle in the crystal. Can anyone recommend a resource that would help with this?

Does anyone have a clue on how to obtain the mesh from the ultrasound image? The region of scatterer is automatically more densely meshed than its ambient. Any software? algorithm? Thx. Elgen

Hello. I'm interested intaking a cloud formed of activated carbon particles and particulates of some other substance to produce static electricity similar to that formed in a cumulonimbus cloud. The means of containing this experiment is another matter. I understand that when "opposite...

hi, I am just not able to solve this problem in the generation part of electrical power system. I am not able to plot the load curve and the load duration curve.sum is as follows:- A power station has to meet the foll demand:- GROUP A: 200 kw between 8 am and 6 pm. GROUP B: 100 kw between...

Hey, I am wondering how to solve this heat equation with a 'generation' term included. In one instance I am adding the generation term, in the other I am subtracting it. a\frac{\partial^{2}f }{\partial x^{2}}-\frac{\partial f}{\partial t} - \lambda f = 0 a\frac{\partial^{2}f...

i would be delightful if someone Can suggest me any book for this topic-'Electrical power generation and distribution in an aircraft. i am doing my thesis work on it. i would like to add few more points with your help. Thank you

Hello all, This is my first post here, and I've got something that is stumping me. no this is not for homework, My question is this, When electricity is generated, where do the electrons come from? I mean if they we're coming from the copper wires, or magnets inside the dynamo wouldn't we see...

Well it is interesting, a lot of it seems science fiction at the moment, but who knows what the future holds!

Hi guys I'm reading a section in a book about non-linear optics. They have an expression for the polarization for the second harmonic field. They say that this expression has a linear and a non-linear contribution at frequency 2ω, but they don't explain this any further. I am a little...

Hello reader, I was heating some coffee in the microwave oven today when I had an idea come to me. Is it Possible to heat water with microwaves, (dielectric heating) to superheat water? Then allow it to form to steam, turn that steam into dry steam. And then use that to turn a generator...

I know that this has been proposed as a possibility for large scale power generation for many years, but according to this new article it seems that at least one power company is very serious about getting this up and running in the very near future. Any thoughts on this? Do you think it will...

I've been trying to wrap my head around this one for a while. What are the drawbacks to using a brayton cycle solar generation setup? Here's the setup. It seems a car turbo is the cheapest and best suited so that's what I'll prototype if the idea gets that far. Atmosphere => Compressor =>...

Homework Statement What is the name of the following very small unit? {f}'(x) h The Attempt at a Solution I know the name in Finnish "Differentiaalikehitelma", but not in English. However, I have not managed to find help about the method which my professor says is very important...

Homework Statement A windmill is designed to operate at 20 rpm in a 15 mph wind and produce 300 kW of power. The blades are 1.75 ft in diameter. A model 1.75 ft in diameter is to be tested at 90 mph wind velocity. What rotor speed should be used, and what power should be expected...

Hello All I am new to this great forum. I would like some thoughts on my idea which is: I am designing a passive solar greenhouse for aquaponics. I am concerned about excess heat in the summer (I am in western NY Sate). A requirement is air exchange for a healthy interior environment. I am...

Are there any good resources for learning how Electric Power Generation works? For example, let's say you have a deisel generator pumping 60 Hz into the Grid. I'm wondering how the physics of this works, or if there is a reference area on the internet I can learn more about this. Or if...

In the double slit experiment sometimes it is claimed that one electron at a time could be fired. Can we deterministically generate one electron when we want ? is it like a gun where you pull the trigger and exactly one electron will be detected or is it that we energize some source and "wait...

welcome every body i have question about the photons generation? i know that there are two ways to generate what so called photon 1-- the first is by atomic transition and i study this way alot 2-- the second by electrons oscillation due to ac current like in antnna My question is why...

Let's assume the case for metallic ring that possesses a net negative charge within. To generate a magnetic field, the field generated by negative charges should not be canceled out by the positive charge. There are two ways to do this: 1) Move only the electrons. 2) Move the electrons with the...

Hey, I was wondering if someone could post or create/explain a simple piezoeletric problem in which a stress acts on a piezo material and creates a voltage. I want to be able to understand how to caculate the voltage generated and current created. Thanks for any help

After walking along the Thames every day on the way to work, I noticed that the water lever difference is between low and high tide is about 7-8m. Thoughts soon turned to how to harness this for power generation. The idea I had is to have a large weight buoyed so that it would rise with the...

GHz ac frequency- Maximum "Practical" generation - Solenoid question for the experts. It's me again. Big ideas, big questions. (A quick special thanks to everyone who has ever taken a moment to answer my questions: (Bob S, bipolar, Phrak, f95toli, jambaugh, waht, Pumblechook, ZapperZ...

Hi, I am a novice. I have very sensitive high end audio equipment. I want to power them up from an independent source. I was contemplating using a electric motor driven generator. I want to do this to supply cleanest power to the equipment/electronics. My power requirement is about 5 KVA. I am...

Dear All I need to generate data for my research. Let I have a linear equation with 3 independent variables and 1 dependent variable a0x0 + a1x1 + a3x3 = y I want each of my variable(x0, x1, x2) has a defined R2 (r square) with y. Let x0-y = 0.8, x1-y = 0.9, x2-y = 0.85. Any reference how to...

This is my first post on these, so let me introduce myself. I'm 30 year olds and I work in the HVAC-R industry. I live in Norway, so bear with me on my English, which might be somewhat "off" some places. As we all know, power consumption in all electric appliances equals heat. I know that some...

is the only way to generate a photon by knocking an electron into a higher energy level and when it jumps back to its original energy level it releases the photon because of its excess energy. and wouldn't that mean that an electrical current is always needed so that the electron can initially...

For those familar with Irans current nuclear power plant that is under construction, the Iranians claim is for peaceful electrical generation but Israelis claim it is used to enrich Uranium for the purpose of WMD. Any comments on Iranian under construction nuclear plant?

I've been reading a few articles lately, such as http://www.boston.com/lifestyle/gallery/dumbestgeneration/" , about how my generation is the dumbest. When I first heard about this, I thought it was a bunch of crap. I thought to myself, I'm pretty smart, write? But then taking a moment to...

Homework Statement (a) Compute the specific energy generation rate of the Sun as a whole. (b) Assume a human of weight 100 kg has a “luminosity” of 100 W. Compute the specific energy generation rate of a this human. Homework Equations Need help with the equations part. The...

This question concerns a problem in Arfken and Weber (from the infinite series chapter, after the power series section). I went to the homework section, and the titles beneath each section specifically imply that a question from a graduate book is inappropriate for that section. I thus post it...

A magnet surrounded by copper wire spins generating a A/C current down a wire for as long as it spins. Are electrons generating the current and amperage? If so, where are the electrons emenating from and why don't they ever run out? Also why doesn't the copper and or magnet end up becoming...

DC generation back during Edison... Hi all, As most EE's know, back in the late 1800's, there was a debate on how electricity should be generated and distributed. Edison was the advocate of distributing DC electricity (since he owned all the appropriate patents) while Westinghouse and Tesla...

Hi, Can anyone tell me an algorithm to generate the stationary Gaussian distribution R(t) with \langle R(t) \rangle = 0 (zero mean) \langle R(t) R(t')^{T} \rangle = A \delta(t-t') , A = 2 \gamma k_B T m (autocorrelation) ? What I just wrote is from the Wikipedia article "Langevin...

Hello everyone! Quick question, anyone know of any computer codes that will take in a long list of block data linked to other lists of block data and will create tree diagrams? My specific problem is for documents (research papers) that reference other papers and so on. If not, should I...

would like to ask, is that possible to generate electricity without using available electric and magnet? is that if we don't have magnet, we wouldn't have electricity? could the positive or negative field be gathered without using the magnet?

i read an article in the boston globe about this being the dumbest generation due to all the amenities of the digital age. the author contends that our great technology, instead of making youth brighter, has had the opposite effect. for example, he says that students use the internet not to...

Hi, I'm new to this forum. I'm doing a self-taught course on physics and I've been given a research topic of coal-fired generation of electricity. I'm supposed to answer the following questions: 1. An explanation of the physics involved in the energy production, including the application of...

Hi all, i was trying to use a thermoelectric board to generate electricity from a presistently hot surface. I wonder if there are any effective ways to boost the power generated? I tried to use a heat sink on the cool side of the board to maintain the temperature difference, but the effect is...

Hello everyone. I have searched the forum and didn't find a discussion about atomospheric water generation anywhere so far. If you know of a better place for this post, please let me know. There are several companies that claim to extract water from the atmosphere. Does anyone know how to...

Hi please explain the vortex flow the vortex flow properties the vortex flow Generation the vortex flow behaviour Ryan

Dear experts, I'm thinking if there are any free tools available for download which are capable of generating transfer functions based on a drawn amplifier circuit?

Ozone Generation (Help required) I am working on the project of "Ozone generation". Generation of ozone is done using discharge tube working at around 6KV. But the source from where I got the details of the project doesn't provided the information on the construction part of it. Please...

I was just thinking last night about the generation of electricity. Are there any mechanical forms (as opposed to chemical or solar or other) of electricity generation that are not ultimately dependent on permanent magnets? If we had no permanent magnets, would we have any way to generate...

So this sentence kind of confuses me: "On the other hand, if \alpha is a root of x^3 - x + 1, then \beta = \alpha^2 is a root of x^3 - 2x^2 + x - 1. The two fields Q(\alpha) and Q(\beta) are actually equal though if we were presented only with one of the two polynomials, it might take us some...

I want to look into the feasibility of manufacturing "dirt cheap" solar powered electricity generators for small businesses and households in sunny third world countries. MARKET IDEA Small electric generators of any kind are obviously uneconomic compared to a central grid. But vast rural...

I know that in a semiconductor in thermal equilibrium generation and recombination are equivalent. This is obvious from continuity equation since in thermal equilibrium there is no time derivatives nor spatial gradients. However, I have read that in "stationary state" generation and...

I read that em waves get generated by oscillating and/or accelerating charges. I am confused on how this occurs. Doesn't this violate energy conservation? Say 2 charges( a +& a -) are separated by a certain distance. So they have potential energy. Then you let them go. The potential energy is...

Since many problems in physics are proving difficult, would it be possible to create a theory generator? It would be set to focus on one problem, like quantum gravity. It would be fed experimental results and goals and then be set free to evolve theories that produced those results. Has this...

In another thread, ZapperZ wrote something which reminded me of a concern I have harbored for some time: I have noticed--- or think I have noticed--- a steady decline in the reading and writing skills of PF newbies who appear to belong to the juvenile cohort, biologically speaking. Many...