Phase Definition and 1000 Threads

Hi! I am searching for litterature on the decomposition of a sine wave in its three parameters: phase, frequency and amplitude. I just need it to justify an analysis that I am doing this way and it appears to be hard to find such a book. I find many website but nothing I can cite seriously! Thanks!

Hello everyone, I have a three phase circuit that consists of a three-phase transformer bank feeding a balanced three-phase delta load. The transformer bank consists of three single phase transformers connected in delta. Each transformer is rated at 333kVA, 2400V. Two of the transformers...

A simple harmonic oscillator consists of a block of mass 45 g attached to a spring of spring constant 240 N/m, oscillating on a frictionless surface. If the block is displaced 3.5 cm from its equilibrium position and released so that its initial velocity is zero, what is the phase constant, φ ...

For a given closed system that does not experience phase transitions, does its internal energy depend only on its temperature?

Atp is stored in g1 phase,is it right?I have got this information but want to verify.

Homework Statement How many kilocalories of heat are needed to change 143N of ethyl alcohol at 65°C to vapour? Homework Equations Lv = Q/m The Attempt at a Solution I'm really stuck. I have no idea how to work the units of N with heat problems. I've looked online and in my book and have no...

As we know topological phases cannot be explained using spontaneous symmetry breaking and order parameter. But can they coexist? Suppose there is a system which is undergoing quantum phase transition to a anti-ferromagnetic phase from a disordered phase. So in the anti-ferromagnetic phase...

Capacitor-start induction motors use a capacitor in series with the start winding to create torque to start the motor. After the motor gets nearly up to full speed, a switch takes the capacitor out of the circuit. I understand the torque is caused by the phase shift created by having the...

Some books say that there is a gauge transform that we can put an extra phase e^{i \phi ( R(t))} to the wave function. Since R(t=0) = R(t=T), difference in \phi = 2 pi n, where n is any integers. As gauge transform would lead to 2 pi n difference, berry phase is determined up to 2pi n. However...

Hello, I'using Matlab to simulate phase shift in frequency domain (FD). I have got real and imaginary parts of the signal after FFT. I'd like to use phase shift in FD. This works: Y=fft(y); YY=Y.exp(-i*2*pi*nk/N*samples_delay); result=ifft(YY); But in my DSP I can't use the formula above and...

There is phase space, phase point, etc. So what is the exact meaning of phase? I only understand the definition of phase in wave. Beside what is canonical coordinate? What does this canonical mean?

is there anyone who knows a company that can design single phase induction motor prototypes in the UK..Thanks for your help

Hello, I have got a three phase motor connected in delta that is controlled in six step commutation. When I measure the line current of one of the phase under oscilloscope, I got something like this : Can anyone tell me why the amplitude of the current isn't 3.1A and -3.1A? What I got here...

I live in a rural area in a third world country. Power problems are very common here. My house has three-phase power. It's quite big so maybe that's why my father used three-phase. It is currently distributed around the house. A phase is assigned to every section. Anyways, I have a problem...

If we have solid water (ice) at -5 C and atm P, then according to thermodynamics, the process that takes that ice (at -5 C & atm P) from solid to liquid is non-spontaneous, which means its ΔG > 0. Hence, it is impossible for someone to observe ice melt to liquid at -5 C, and assuming we started...

Hello, I have a three phase BLDC motor and I am trying to figure out its phase resistance. I have acquired the three-phase voltages and three-phase line currents of this motor. The voltage is in trapezoidal form whereas the current is in rectangular form My question is: how can I find out the...

Dear expert, dear all. As my knowledge, the single phase motor is not a seft-starting motor. i suppose that there is only main winding in single phase motor. as you know, the rotor can not start because of the 2 opposites force cause by 2 oppositely rotating magnetic fields. the question is...

I have just been reading a classical paper on the formation of majorana edge states (MES) in quantum wires. The hamiltonian is Kitaev type with a superconducting and spin-orbit interacting and one finds that the energies have a gap that closes and reopens as we vary the magnetic field. According...

Homework Statement Trajectories around a black hole can be described by ## \frac{d^2u}{d\theta^2} + u = \alpha \epsilon u^2 ##, where ##u = \frac{1}{r}## and ##\theta## is azimuthal angle. (a) By using ##v = \frac{du}{d\theta}##, reduce system to 2D and find fixed points and their stability...

Homework Statement A sinusoidal wave traveling in the –x direction (to the left) has an amplitude of 20.0 cm, a wavelength of 35.0 cm and a frequency of 12.0 Hz. The transverse position of an element of the medium at t = 0, x = 0 is y = –3.00 cm and the element has a positive velocity here. (a)...

Homework Statement Serway's Physics for Sciencetists and Engineers with Modern Physics, 9th Edition (current), Chapter 16, problem 19:[/B] (a) Write the expression for y as a function of x and t in SI units for a sinusoidal wave traveling along a rope in the negative x direction with the...

A quick calculation shows that across the continental United States, spanning about 3000 miles, there is a delay from east to west coast of about 1/60th of a second. 3000 miles divided by 186,000 miles per second. This is a full cycle phase variation cost to cost. Is there truly "The Power...

Hi I'm trying to use Peierl's argument which in essence is clear to prove that there does exist a phase transition in the 2D Ising model without external field. The issue I'm having is of a more mathematical nature, in class it was mentioned that there is a phase transition if for some ##\delta...

Hi everyone... I have to design a single phase induction motor. I have some questions and it would be great if you could help me. The parameters I have for the design of the motor are: rated power, rated voltage, frequency, rated speed, power factor, efficiency, full load current and full load...

I have heard that bacteria produce some chemicals/toxins when it dies at the death phase. I need to know exactly what chemicals are produced by E.coli when it dies? Ethanol? Peptides? It this problem explored? If so – how these toxins impact on bacteria? :rolleyes:

I'm using a 3 phase 5HP motor pump n want to use capacitor. Which capacitor should I use and how to connect it to all the three phases? Please do needful

First, two definitions: let ## \varrho (M)## be the probability density of macro states ##M ## (which correspond to a subgroup of the phase space) and ## \mathrm{d} \Gamma ## be the volume element of a phase space. In my lecture notes, the derivation for continuity equation of probability...

According to Maxwell's equations, $$c=\frac 1 {\sqrt{μ_0 μ_r ε_0 ε_r}}$$ in a medium with an electric permittivity of ##ε_r## and magnetic permeability of ##μ_r##. This means that in any medium which has values for these properties which are greater than that of a vacuum, the speed of light...

<< Thread moved from the technical engineering forums to HH >>[/color] I'm currently studying for a HNC in electrical engineering and am currently stuck on a question on one of my assignments. The question is: A Delta-delta, 3 phase transformer steps down the system line voltage of 132kV to a...

Given w =1, What is phiG ? Is it the phase difference between the two waves? If it is, isn't it simply phiG = (delta t/T)*360 but I am not getting the right answer. PhiG = (0.5/2pi)*360 = 28.6 Also I don't know where this wt + phi = 2pi equation comes from.

In Lagrangian/Hamiltonian mechanics, what is it that makes phase space special compared to configuration space? As a simple example, if I use ## q ## as my generalized position and ## v = \dot{q} ## as my generalized momentum, then the Hamiltonian H = \frac{1}{2} v^2 + \frac{1}{m} V(q) gives...

Suppose you are given a phase spectrum or (/and) equation of the (main) signal only and you are said that the given (main) signal is formed of 3 other signals. Is it possible to compute phases of these three signals from the equation or (/ and) phase spectrum of the (main) signal? Also,what...

Homework Statement The bulb of a constant volume gas thermometer is immersed in an ice/water/water vapour mixture at equilibrium and the recorded pressure is 0.400 atm. It is then immersed in a boiling liquid and the pressure is 0.844 atm. Sufficient gas is then removed from the bulb such that...

Homework Statement I have the formula l2 - l1 = m lambda and I am not sure what each part of the equation stands for? I think l2 and l1 are distances to where the waves meet but I am not sure. Thanks Homework EquationsThe Attempt at a Solution

Hi all! I'm working on a project of heating water from exhaust gases of kamin's chimney. I have a cross flow heat exchanger (see pdf). we have done calculations of heat transfer rate and the outlet temerature of the water, and got 150C. so it probably gets boiled somewhere inside the HX. I need...

Homework Statement A non–uniform disk of mass M and radius R rolls without slipping along a horizontal plane in a straight line as shown in the attachment. The centre of gravity G is displaced a distance a from the centre of the disk. Let θ be the angle between the downward vertical and the...

Some please clear my confusion here, when you compress a fluid the temperature increases. Since the temperature increases (fluid gets warmer), why is the fluid condensing from gas to fluid? when temperature increases, isn't that the fluid will evaporate? This has been bugging for awhile...

I have computed magnitude and phase spectrum of very famous image of cameraman using fft function in MATLAB.Here,we get magnitude and phase spectrum of the whole image. But I want to find phase values of the neighboring pixels . So if given gray scale image is of dimensions 256*256 and if I...

Homework Statement Consider the Landau free energy ##\mathcal{L}=-hm+r_1 t m^2+Cm^3+s_0 m^4## with an additional ##m^3## term. We consider zero magnetic field case ##h=0## and ##s_0>0##. a.) Please show that there are two critical temperatures ##t*## and ##t_1##. When ##t<t*##, a second...

I have the values for all the voltages and currents. I'm wondering how I go about it, given that v3 = v30 (cos (Θ3) + isin(Θ3)) and I have a value for v3. Since v3 = i4 * Z where Z is C3 and R2 in parallel, there'd still be 2 unknowns. I feel as though I'm missing something obvious, if anyone...

Hi, I'm very confused about one question in my homework, that is due today. I appreciate any help.Thank you very much. 1. Homework Statement The motion of a particle is given by: x = (6.0m) cos(0.586t + 0.72) Find the phase at time t=1.38s 2. Homework Equations Simple harmonic motion The...

Homework Statement This is actually a lab I'm performing on Multisim. I've recreated a circuit that I build in lab class , but I'm not getting the output I need. I am trying to calculate the V and phase angle across each component. I already have the measurements found form the class lab. In...

Hi, Does anyone know about these? Specifically I'm trying to figure out changing the tap on the Delta effects the series voltage: source wiki: http://en.wikipedia.org/wiki/Quadrature_booster Any vector diagram or word explanations will help. Also, what size diameter coils must be used on the...

I am trying to conceptually connect the two formulations of quantum mechanics. The phase space formulation deals with quasi-probability distributions on the phase space and the path integral formulation usually deals with a sum-over-paths in the configuration space. I see how they both lead...

Homework Statement Light with wavelength 100nm is incident perpendicularly from air on a film 0.500μm thick and with refractive index 2.5. Part of the light is reflected from the first surface of the film, and part enters the film and is reflected back at the second surface, where the film is...

Lets say I have a switchboard that requires ONLY 3 Phase loads, transformer, UPS, Motors, ETC. ( no neutral is required at all) Now let's say I am feeding this from a generator where I have 4 wires from the alternator ABCN connected to the aforementioned switchboard. the N of the generator...

1. The figure shows two point sources S1 and S2 that emit sound of wavelength λ = 1.8 m. The emissions are isotropic and in phase, and the separation between the sources is d = 18.0 m. At any point P on the x axis, the wave from S1 and the wave from S2 interfere. Start with P very far away (x =...

Hello everyone,I want to ask very basic question related to multidimentional signals like an image or a video signal. Physically what is phase of an Image? Also what is its physical significance of phase compared to magnitude of an image?

Homework Statement a) Starting from Equation 5-1, show that the group velocity can also be expressed as: vg = vp - λ(dvp/dλ) b) The phase velocity of each wavelength of white light moving through ordinary glass is a function of the wavelength; that is, glass is a dispersive medium. What is...

Homework Statement Calculate the current in the capacitor shown in the figure below if the voltage input is V(t) = 29cos(377t-30) V, C = 1 micro Farad Homework Equations i = C dv/dt The Attempt at a Solution I essentially differntiate V(t) and multiply by 1 * 10^-6. I then get a negative...