Generation Definition and 363 Threads

Homework Statement The Clausius inequality combined with the defintion of entropy yields an inequality known as the increase of entropy principal, expressed as Sgen ≥ 0 where Sgen is the entropy generated during a process. Homework Equations Sgen ≥ 0 The Attempt at a Solution...

Hi all, this is my first post. I was wondering if it would be possible to use a deflatable/inflatable bladder inside a housing with an air valve at the top and bottom of said bladder secured through the housing. The housing material would be heavy, placticised metal or stainless steel. This...

Hello everyone! Need help with understanding the terms "distributed/decentralized" vs. "regional power generation". 1. Is there any difference between the terms "distributed" and "decentralized" generation (of electricity)? I thought "distributed" means generation of electricity on units...

I could rephrase the same question, why does the frequency decrease when load exceeds generation? I know these are fundamental operating characteristics of a power system network but I'm not sure I can mathematically prove it. My best guess is that everything dissipates more power when the...

3 generation is required for anomaly cancellation, then the 4th generation seems redundant. But there are still papers about the 4th generation, what is the reason? Thanks

Homework Statement A coal-fired steam power plant operates on the ideal Rankine cycle. Feedwater from the condenser at P1 = 10 kPa is pumped to the boiler at P2 = P3 = 20 MPa, where it is superheated and exits the boiler at T3 = 550 °C. The moisture content in the turbine is...

Let's say I have a magnet inside a coil of wire. If I spin the magnet for a 10 second period, twice, the second time spinning it significantly faster, will more current be induced during the second period? And would this apply to generators in wind turbines, etc.? Thanks.

Hello Physics Forum, I am a second year student and with a team of 4 and instructed to design an auto belay for rock climbing. The main functions it has are: descending, braking and switching from a stopped position to descending. We've come up with a few designs/concepts for descending...

Hi all I saw the posting below in regards to nuclear not being all that its cracked up to be. This is from a scientist in europe. I am intersted in rebuttals. I am pro nuke and just entering the industry but I do not have the experience to shoot this down. Fishing for comments Post...

Homework Statement Two sites are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas the second site the wind blows at 10m/s for 2000 hours per year. Assuming wind velocity is negligible at other times for simplicity...

I am going to use piezoelectric disks to generate energy from pedestrial movement on footpath please help me which circuit i have to prefer for my project?

A few days ago I read the phrase "variable-capacitance power generation." I tried to find more information, but nothing turned up. Is anyone here familiar with it?

When light is absorbed by a semiconductor, it will only lead to generation of EHPs if the light has energy greater than or equal to the bandgap. Now, all the sources I've been able to find online say that any excess energy in this process (ie, E>Eg) is simply reabsorbed into the lattice as the...

The gold standard for generating random numbers is the quantum effect of nuclear decay -- particles and photons being emitted from the atomic nucleus -- and unless you are one of those Hidden Variables types this is really random. The silver standard is thermal noise. There is a nice article in...

Hi all, I am trying to develop an application that converts a parallel set of input contours(polygons) with constant Z values to a tessellated surface mesh .The contours may also consist of holes All available tessellation techniques like glu,delaunay talk about 2d triangulations only...

Are particles that are not stable (for example top, bottom quarks; W and Z) when produced in particle colliders possibly stable at very high energies? Are third generation particles stable at high energies? Thanks, Mark

I don't understand the mechanism by which "flux tubes" create heat, and are pinned by impurities in a type II superconductor. When Bc1<B<Bc2 I understand magnetic flux will penetrate the material in the form of flux tubes. Then the current in the superconductor exerts a force on these tubes...

[PLAIN]https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc7/313028_10150383340891940_666206939_8328916_99129355_n.jpg Would this system work, if the air-water isolation problem (water leakage into the air tank) is solved? If it would work, where does the input energy comes from? We obtain...

I read an article that using peizoelectricity , ideas to generate energy from public movements was tried. How far was it sucess? If this is possible , can we generate energy from vehicles movement on roads?

Introduction: The evolution of stellar objects is inherently caused by the chemical composition of the star. Internally, thermonuclear reactions leading to the formation of complex atoms lead to a change in chemical composition which in turn will affect the evolutionary position of a star...

Homework Statement Calculate the energy generation coefficient ε (J s^-s kg^-1) in the center of a 50 Solar mass Main Sequence star, assuming that all luminosity is generated in a constant density core containing one tenth of the total mass of the star. Homework Equations L=M^3.3...

Is the Haber process ever used to generate electricity? I recognize that it's not an efficient means, because of the amount of energy needed to create H2 gas, but because the actual Haber process is exothermic and is less efficient once the temperature creeps above 400 degrees, why shouldn't it...

Hello everyone, I represent an iron & steel manufacturing industry which runs on electricity. Currently our electricity consumption is 1,000,000 units/month @ 5.5 INR/Unit consumed along with maximum kVA reached during the time of manufacturing of product which is affecting the costing of...

OK so i know it is possible to double the frequency of a light beam by using second harmonic generation by passing the beam through a non-linear crystal; however i am unclear as to the required intensity of light beam that is needed to achieve efficient conversation. Would it be possible to...

When a broadband 800nm sub-ps pulse propagates through ZnTe parallel to the {110} plane it produces in-phase THz radiation by moving the electrons down either the [-111] or [1-11] axis. Due to the electronegativity of Zn and Te the electric field of the optical pulse will push electrons...

Homework Statement Scientific Method - Set procedures / steps to investigating a thought / observation Spontaneous Generation - Living things came about by non-living things Homework Equations Define the importance of the scientific method with respect to the theory of spontaneous...

Hello, does anyone know of a code that will generate the expected neutron spectrum for an AmBe neutron source along with the expected reaction efficiency?

Hi all, I would love if someone could clarify these five questions for me: 1. Is it correctly understood that all stars are of a certain generation? 2. Which generation is the sun? 3. What is the highest generation star we know of? 4. In the Milky Way, what is the share of first...

From this day , if we take in account . How much population will be my following generation at the end of 2000 years(from this day). My question is , will the population be thousands or millions? Will it likely be fade away in the middle and no trace remains in the end? Any...

Hi All, I was searching in the net if the exact solution of the nonlinear system describing the second harmonic generation does exist, but I found nothing. Does some one know about such solution and if yes can you give references? Thanks

Homework Statement The logistic random variable X has CDF: F(X) = exp(a + bx)/(a + exp(a + bx)), b>0 (i) Obtain a formula for random values of X in terms of R ~ U(0,1) (ii) Using the cdf, suppose that a certain application requires you to generate 'the middle one of three' i.i.d...

What novel objects do you anticipate we will observe among the very first galaxies? Among the first stars?

Homework Statement Consider the following probability table: X 1 2 3 4 P(X) 0.4 0.25 0.25 0.1 Use the rejection method to generate a random number. Use the following list of random numbers: 0.6072, 0.4893, 0.0899, 0.3456, 0.4419...

Homework Statement a gas fired turbine generator for producing electricity has an efficiency of about 50%. how many cubic feet would be needed to produce 1000MW for one year. Homework Equations 2.4 x 10 ^8 SCF/day is the natural gas required for the power plant input = 2.4x10^11...

I am from India.I am currently doing my graduation in mechanical engineering.One thing that has attracted me a lot is energy production.I want to know if there are any PG courses specific to energy production any where.

I've been reading a bit recently on Second Harmonic Generation and came across a supposedly separate technique called Hyper-Rayleigh Scattering (HRS). Can anyone explain the difference? I came across this paper, but didn't understand the difference...

Homework Statement There's a slab of a material with temperature T1 on the left and the T2 on the right. The thickness of the material is l with area A. In the centre, there is heat generation Qvol in the centre, which is a thin rod. Find the heat transfer Q through the material. Homework...

Hello, first time posting. If this is in the wrong forum, please move it to the correct one. (its a cross mechanical/structural/civil/electrical engineering idea) I was thinking on the way home Power generation. In order to generate power, wave motion can be used (such as tidal/wave power...

I am working on an HVAC system for a winery. Part of the heat loading during the peak late summer/fall season will be from the fermentation process and I am having difficulty finding information on the amount of heat generated from fermentation of wine. Exposed wine surface area of each tank...

ELECTRICITY GENERATION THROUGH THE CONVERSION OF ENERGY PRODUCED BY REVOLVING GEARS OF A TURNSTILE As the title implies, do you think it's feasible? I'm working on it as a topic on my research subject, but I'm having a hard time. I didn't know that there are lots of principles involved...

could second and third generation SM particles NOT be fundamental? since they are unstable and rapidly decay, could second and third generation SM particles NOT be fundamental? perhaps as bound states of more fundamental first generation particles? if they are not fundamental, then do we...

\mathrm{prob} \propto \mathrm{e}^{-\frac{(a -x_1)^2}{2 \sigma^2}} \mathrm{e}^{-\frac{(x_1 -x_2)^2}{2 \sigma^2}} \mathrm{e}^{-\frac{(x_2 -x_3)^2}{2 \sigma^2}} \mathrm{e}^{-\frac{(x_3 -b)^2}{2 \sigma^2}} a and b are known real constants. Is there a way to generate x_1, x_2, x_3 independently...

There is a step in some book which is vaguely explained, I just want to check whether my working is correct. Let G be a group, and let x be in G-{1}. Let Y be the set \left\{g^{-1}xg : g\in G\right\} . I want to show <Y> is normal in G. Now it's clear why Y is invariant under conjugation (Y...

Generally the working fluids in a power generating system is either water (steam) or air. This I imagine is because they are widely available fluids. The specific heats of these ranging from some 1 - 2 kJ/kg-K. For the sake of argument, let's assume that hydrogen or xenon are equally...

Hi I was told that I2ω is proportional to Iω2. It does not say so in my book. How is it one can easily see that it is the case? Niles.

1. Homework Statement A capacitor of capacitance C id charged by a battery of emf E and inernal resistance r, A resistance 2r is also connected in series with the capacitor. The amount of heat liberated inside the battery by the time capacitor is 50% charged is? Answer is E2/C 2...

With our present level of knowledge the only possible way for humans to leave the Solar system would be “Generation Ships”, large relatively slow spaceships that would take several generations to reach their destination. Even if such ships could be constructed, is it morally acceptable to...

Greetings, I'm seeing programs that allow solar, wind and other types of power generation to be connected to your house (or business) and you are still connected to your grid. The power company meters both - what they provide to you and what your private generation provides. Your power...

An object with a mass M is rotating around an axis, with an arm of radius R at a certain speed V. Assuming that the movement is constant, and a 100% efficiency, how many watt of electrical power can this device generate ? For example purpose, we can take M=60 kg, R=5 meters and V=10 meters per...