Phase Definition and 1000 Threads

Is there a relationship between amplitude and phase response of a realizable filter? For the purpose of ease, let us consider only a FIR digital filter. I would like to design a FIR digital filter with a given frequency response (amplitude and phase responses given as a function of frequency)...

Up to this point I have got a grasp of some basics of "steepest descent method" to evaluate the integral of a complex exponential function ##f(z) = \exp(A(x,y))\exp(iB(x,y))##. Using this method the original integration path is modified in such a way that it passes through its saddle points...

Homework Statement Please see attachment for circuit and parameters. Homework Equations i --> 90 phase angle for inductor so Z of inductor = 0.5<90 sum of voltages = 0 #<40 = #*cos(40) + i*sin(40)*# The Attempt at a Solution shteii01 - 100 + 0.5<90 + V2<theta = 0 --> 100 + 0.5*cos(90) +...

Hopefully I can word this correctly. Consider viewing S11 of a short on a smith chart. It starts at the left and moves clockwise around the edge. If you then add a small length of line between the reference plane and the short, the phase angle wraps further around the outside in the clockwise...

Homework Statement An inductive load is connected to a 120V (rms), 60Hz AC source. The load draws 5.0 kW at a power factor of 0.81 (lagging). You need to improve your power factor to 0.96 (lagging) by adding a capacitor. What is the Capacitance needed (in uF)? Homework Equations P/|S| =...

Homework Statement A mass m = 750 g is connected to a spring with spring constant k = 1.5 N/m. At t = 0 the mass is set into simple harmonic motion (no damping) with the initial conditions represented by the point P in the phase space diagram at the right. **(This phase space diagram has...

Hello everybody, I want to confirm that the following plot is correct, especially with regards to how the phase changes after the critical angle. The professor at my school confirms its correct, but after reviewing the relations, I get an opposite shift for the TE wave. So can you confirm...

Hello, I am watching this video to try and better understand Gibb's Phase rule The part of interest starts at 4:30 I like that he is using a visual to explain, which is very helpful. When there is 1 phase and one component, there are 2 degrees of freedom. This means two variables can be...

Homework Statement http://i.imgur.com/u8vUv5a.jpg Find the phase constant. Homework Equations x(t)=Acos(ωt + Φ) v(t)=-Aωsin(ωt + Φ) Vmax = ωA ω=2π/T The Attempt at a Solution ω = 2π/12 = 0.5236 A = 60/0.5236 = 114.59 cm v(0) = -30 = -114.59(0.5236)sinΦ 0.5 = sinΦ Φ = π/6 and 5π/6. Which...

Homework Statement http://i.imgur.com/TZcJkjH.jpg Find the phase constant Homework Equations x(t) = Acos(wt + Φ) x(t) = Asin(wt + Φ) w = 2pi/T The Attempt at a Solution I see A = 20cm. T = 4s. f = 1/4 = 0.25Hz. w = 2pi/4 = 1.57Hz. 10 = 20cosΦ 0.5 = cosΦ Φ = π/3, 5.24?

Hi everyone,1. Homework Statement Three inductors with 0.1 H each are delta connected to three phase ac newtork with 220V/50Hz. Determine Iph, IL, P, Q and Theta. Homework Equations Showed at the attempt. The Attempt at a Solution [/B] XL=2*pi*f*L=31.4 ohms Iph=Uph/XL=220/31.4=7 A...

Hi, do you know how i can calculate the phase shift of measured reflectance data? I find the dispersion relation formula but I can´t solve it. I know that this dispersion formula is split in three terms. The first term has a range form 0 to w_min, the second term from w_min to w_max and the...

Hi, If the voltage, full load current and full load output power (kW) of a 3 phase induction motor are known, and the efficiency is assumed to be 90% (is this realistic), am I correct in thinking that the full load power factor can be approximated (due to assumed and not actual efficiency) as...

Hi, I need to calculate the voltage regulation of the 3 ph Dzn transformer. I have knowledge of the current going into the primary winding of the transformer (Delta winding) and hence need to calculate the current in the secondary (load current) so that I can use this in the voltage...

Hi, Is there a difference in efficiency between a three phase motor and a single phase motor, in terms of power in against power out. If so, could you please explain why one is more efficient than the other. The reason I ask is because I'm researching the development of the induction motor for...

I have several questions about poles and towers. a. Does all of transmission towers carries three-phase powers? Is there no transmission towers designated for single-phase? b. Does all towers are for transmission purposes only? Is there any towers in the world used for distribution instead of...

Homework Statement A short circuit test is performed on a small single phase transformer. The results are: Primary Voltage 5V, 60Hz Primary Current 2A Secondary Current 10A Primary Power 8W a) Making suitable approximations deduce the primary/secondary turns ratio (single number)? b) Making...

Why are electric and magnetic fields in an electromagnetic wave in phase? Can somebody please explain that?

Are there any chemicals that are liquid under high pressure (above 1 atmospheres) but solid when exposed to low pressures (below 1 atmosphere)? Are there any chemicals that have a similar reverse phase transition at any pressure with the solid extending down to vacuum?

Hello everyone! :) I am studying for an honours course in Statistical Physics. I have stumbled upon the book "Statistical Mechanics of Phase Transitions" by J.M. Yeomans. The layout of the book, as well as information, is exactly what I need. I want to work through the problems and was...

Hello Guys, I was wondering what will happen if the battery pack of my Honda civic hybrid dies (dies = malfunctions, stops working completely things like that) ? Moreover I wanted to know if the IMA/PDU can be removed (not used) to thus convert the engine into the a typical gasoline engine ...

hello! why capacitors and inductors affect the phase of both current and voltage of a AC circuit and resistors don't? let's say we have an AC circuit with resistors only, then there is no change in the voltage and current as imposed from the voltage/current source, right? but what happens...

Homework Statement For a bridge rectifier (4 thyristor) feeding an RL load having infinite inductance (to assume constant current) and a 100 ohm resistance, calculate for firing angles of 90°, 120° & 150° the average DC voltage and current. The bridge supply is 200V RMS. Draw Waveforms of...

Hi, For a single phase full wave fully controlled bridge rectifier carrying a RL load, how is the RMS voltage and current calculated? I have researched textbooks but can only seem to find RMS equations for Resistive loads and I am not sure whether the negative load voltage will affect the...

we talk about three phase supply .. I want to know that what actually is three phase..?? Its obvious there are three wires carrying current but what is "phase" ? Is there something like, transmission line is further divided into three wires ..?? Please explain..its quite basic.. and I am...

In the given figures , what does the arrows denote , I mean what direction ?? VnR is upward in 1st fig. , VnR is towards left in 2nd fig. ( n is neutral here ) while in 3rd the line voltages are in anti-clockwise direction..! I wanted to know the pupose of this and why these directions only??

There are two waves y1=a. sin(ω.t) & y2=a. sin(ω.t + φ) My question is what is the phase difference of these two waves? Is it "φ" or "φ/ω"?

Sorry for such a simple question but where do we model the energy going during phase transitions? If I had a mercury thermometer in a pot of water, and I had a 200 degree Celsius heat reservoir in contact with the water, I would see the water temp hold steady during the phase transition...

Velocity of phase wave in vacuum is grater than light velocty. This contradict the princles of relativity,so how this can be possible.

Hi! Is it possible to measure phase angle in Multisim? I want to measure phase angle of current through capacitor C1: I got by hand ic1(t)=0.117*sqrt(2)*sin(2*pi*50*t-178.040deg) Thanks in advance.

In the recent analysis by Mielczarek, Linsefors, and Barrau, the key parameter is ρc the highest density achieved in the bounce. The extremes (negative and then positive) of the Hubble rate occur symmetrically at density ρc/2 In the contraction preceding bounce, as the density approaches ρc/2...

I have an online homework question and my classmate told me the answer but I would really like someone to explain to me how that answer was determined. I do not understand. Q: Consider the electric field observed at a point O that is far from the two slits, say at a distance r from the midpoint...

Hi, if I simulate a three phase transmission line operating with a fault across two of the phases, would the mutual coupling have any effect on the current through each of the lines, as I have calculated the fault current values using symmetrical component analysis and the values are...

Hi Im doing a project to control a 3 phase switch relactance motor using power electronics. I have choosen 3 mosfets, 2 auto couplers and 2 resistors. 1. Would there be any other devices I need ( to solder to pcb board). 2. What would the circuit digaram look like so I can solder this and...

Hi all, I'm reading a paper on light sheet microscopy, i won't go into detail here but they are generating the light sheet by use of an Airy beam. They are using a term i don't understand when describing how the airy beam is generated. Quote "An Airy beam can be generated through the Fourier...

Hi PF I read the definition of the displacement operator: ##D(\lambda) = e^{\lambda a^\dagger - \lambda ^* a}## but i did not find how this operator can be implemented say in a cavity with a photonic state inside. Could you give me links? thanks.

< Mentor Note -- thread moved from EE to the Homework Help forums > I'm studying for a Level 3 Diploma in Electro technical science. My tutor had a hard time teaching me what I need to know in order to answer this question; Calculate the phase and line current when three resistors each having...

Hello all I know that the step response of a second order underdamped system is : y(t) = 1 – (e^(-ζωn*t) / sin(θ))*sin(ωd*t + θ) Where sin(θ)= sqrt(1-ζ^2) , ωd = sqrt(ωn^2 – ωn^2 * ζ^2 ) my question is: I can see on the simulation ωd and I can calculate it , but I want also to see the...

Homework Statement Hi, This is not a homework question. I have my exam for my physics unit tomorrow. I am pretty set for it except for questions of this type. Can you please show me how I can get the answer? Thanks [/B] Homework Equations N/A The Attempt at a Solution N/A

Hi everyone, is it possible to sum at any given moment in time L1 + L2 + L3, algebrically speaking? If so, what would this value represent? Thanks

Homework Statement An aluminum cup (of negligible mass) is filled with 0.5 kg of water with a temperature of 15◦C and 1.3 kg of ice (at -8 celsius) is added. A)What is the final phase or phases of the mixture? B)What is the final temperature of the mixture? C)How much heat is required to raise...

What is the degrees of freedom at the critical point of a 1 component system such as water. in my test I put zero because the critical point is a POINT that is fixed per substance. is there any books that can back me up? I heard that my teacher said there was 1 degree of freedom which I am...

So a standing wave is one which looks to be standing still at certain harmonic frequencies. At these frequencies, when the wave reflects off the end, it will undergo a phase change of 180 degrees. This creates constructive interference as shown below: In the case of a wave on a string, since...

Hello! This is problem is a part of a bigger problem which I solved and came to a formula which is correct. This is the equation for one transfer function. The next thing I would like to find out here is when arg(H(jw)) is -90 or 90 degrees but I get stuck. Transfer function: ## H(jw) =...

Many websites gives the results of Dew Point but not the reason. What is going on at the dew point? Not the result (at a certain VSP vapour becomes liquid if it can find nuclei to coat) but the reason for the result. I have been reading up on this – just out of curiosity – and would like...

Hello Why are neutrino oscillations insensitive to Majorana phases? I'm guessing it has something to do with them being factored out the PMNS matrix using a diagonal matrix ... i.e. U_PMNS = U Diag (a1, a2, 1) Is there a point in the oscillation calculation where they always cancel due to a...

1. Is nucleation a phenomenon that occurs in all phase change (freezing/melting, evaporation/condensation)? 2. I've always read evaporation/condensation described as a liquid-vapour interface phenomenon (water molecules going entering-leaving the interface at equal rates in equilibrium). If...

Hi have some thermal physics question would like to clarify. Thanks :) Question 1: For a substance in a pure phase heated at constant pressure, the heat absorbed is related to ____________ (a)the molar heat capacity of the substance (b)the amount of substance (c)the change in the kinetic energy...

Hello again, I've got another question that involves symmetrical components, this time I've attempted it. The Question follows: 1. In a 3 phase circuit with resistance earthed and neutral and Earth fault in phase “A” which produces a fault current of 800 amps. Load currents may be taken as...

How would I plot a 3D phase and magnitude plot for the function \(z^{1/3}\) in Matlab? n = 3; % number of roots m = 18; % grid number r = (0:m)'/m; % radius vector theta = pi*(-n*m:n*m)/m; % angle vector z =...