Parameters Definition and 535 Threads

Homework Statement I am given a four bar mechanism and the mathematical representation of a point on the coupler I am looking for ways to determine the lengths of the linkages from this information? Homework EquationsThe Attempt at a Solution I really have no idea

Just curious, are S parameters related to S-domain and Laplace transforms, or is the use of S just a coincidence? I know that when using S parameters you are working in the frequency domain, but it doesn't seem that you need to use the Laplace transform to use the S parameter concept.

Hello All, I am new to the field of electrical ducted fan (EDF) jets and am currently working on a new aerodynamic design using SolidWorks and Flow Simulation for aerodynamics testing. For my computer model, I can enter data for a fan that I would like to use for the thrust of my models, and my...

Homework Statement Eliminate the parameter and identify the graph of the pair of parametric equations. Determine the domain (the set of x-coordinates) and the range (the set of y-coordinates). x = sin t, y = -3 sin t - 5 Homework Equations y = -3x - 5 Domain: (-∞,∞) Range: (-∞,∞) The Attempt...

Homework Statement A locked rotor test is performed on a permanent magnet DC machine with the following results: Terminal Voltage 5 V DC Input Current 10 A DC Locked rotor torque. 20 Nm a) Making suitable approximations deduce the effective rotor resistance in ohms? b) Making suitable...

So, I've recently just began some undergraduate research, and a task I'm working on is developing some simple scripts for IRAF that might be rather useful. I'm new to the whole thing, but my professor has mentioned that daofind can run in a such a way that it only creates coordinates for the...

I've been reviewing my knowledge on the technique of variation of parameters to solve differential equations and have a couple of queries that I'd like to clear up (particularly for 2nd order inhomogeneous ODEs), if possible. The first is that, given the complementary solution...

I was thinking about the various complementary parameters in quantum physics. I'm curious if anyone is aware of a "complete" list of such measurements or qualities that has been compiled in one source, based on current knowledge.

Dear everyone, For example, the simplest action for a nonminimally coupled scalar field is S=\int d^{4}x\sqrt{-g}\left[ \frac{1}{2}g^{\mu \nu }\partial _{\mu }\phi \partial _{\nu }\phi -V(\phi )+\frac{\xi }{2}R\phi ^{2}\right]. \xi=0 leads to the scalar field minimally coupled to the...

How much and what type of parameters needs and enough to completely describe moving? Of particle for example.

Can someone direct me to a way to calculate Right Ascension, Declination, Ecliptic Longitude and Latitude of the Sun and Moon from the Julian Date with the accuracy of VSOP87?

Homework Statement Hi guys, so the problem is as follows: A set of n independent measurements y_{i}, i=1...n are treated as Gaussian, each with standard deviations \sigma_{i}. Each measurement corresponds to a value of a control variable x_{i}. The expectation value of y is given by...

Hi, I was wondering if it would be possible for someone to help me clarify a few things regarding transmission lines and transformers? For a Power Transmission line, what exactly is the mutual coupling between phases of a 3 phase line? Is this the same as the shunt capacitance and if not...

I have a problem with some question I had to answer for the Surface Brightness \Sigma \propto \frac{Flux}{Angular~area}= \frac{F}{\Omega}. I was able to show that \Sigma \propto (1+z)^{-4} Then the question asks whether knowing its value for known candles or yardsticks, is a good way to...

There is a quantity (W) that I would like to calculate that is, ultimately, a function of parameters that I can measure directly (a and b), W = W(a, b) But I cannot measure a and b perfectly, there will be some uncertainty in these measurements. This uncertainty will propagate into my...

I previously used the Ziegler method to tune the parameters of my PID controller to control my robot's position. I then implemented fuzzy logic for self-tuning the parameters. I have two inputs to the fuzzy logic controller; one is the position error and the error rate. I know that my problem...

We have a general spacetime interval ##ds^2 = g_{\mu \nu} dx^\mu dx^\nu##. One way to define an affine parameter is to define it to be any parameter ##u## which is related to the path length ##s## by ##u = as + b## for two constants ##a,b##. One can show that for the tangent vector ##u^\alpha =...

So, I am wanting to vary a parameter in an equation with respect to time. Vary mass flow [ m(t) ] for an exponential decay to half its original value in around 60 seconds. I know the regular decay equation where: m(t)=m0*exp(-At) but I want the value to approach a steady state at 60 seconds...

Homework Statement Homework Equations http://esclab.tw/wiki/images/math/0/a/2/0a24f9d68ba8fd1a1a8e6c6b36a00be3.png The Attempt at a Solution [/B] Hello As you see the answers of 19 and 20 problems we should try to find K or B(wave number) in wave equation.both of equations are in air...

Hello all, this is my first post! Hopefully I can gain some valuable insight. Homework Statement Find the relation among T, P and mu for the system with the given equation U = b S4/NV2 I let b equal the several constants stated in the problem. Homework Equations T=dU/dS P=-dU/dV mu=dU/dN The...

Hey guys, I don't understand how this question works... I don't understand the answers either. Could someone take me through this step-by-step? See attached image:

Eh. I'm not quite sure how to find the curve γ(t). I think that the problem is probably a bit easier being given the parametrization of M. I do know that the point P lies in the xy-plane.

Homework Statement Homework Equations Shown in question. The Attempt at a Solution So I was given this question for homework and I'm really not sure where to start. I'm not looking for somebody to do my homework for me, just somebody to point me in the right direction. The...

x=c_1 cos(t)+c_2sin(t) is a family of solution to x''+x=0. Given x(\frac{\pi}{6})=\frac{1}{2} and x'(\frac{\pi}{6})=0 find a solution to the second order IVP consisting of this differential equation and the given intial conditions. The answer key has x=\frac{\sqrt{3}}{4}cos(t)+\frac{1}{4}sin(t)...

Hello, To measure the atomic force with an AFM. One can use the frequency shift of a cantilever. This change of frequency is linked to the atomic force by what we called the Franz J. Giessibl formula in the community. z is the AFM tip-sample distance. frequency(z) is the change of...

I have an ODE ##e^{2x}H(Hv'(x) + H'v' + Hv'') + (k^2 - 2e^{2x}H^2(1 + \frac{H'}{2H}))v = 0## where ##H(x)## is a known function that Mathematica has stored as an interpolation from a previous ODE and ##v(x)## is the unknown function to be solved for. ##k## is the adjustable parameter. Using...

Forgive the title if improper, the language of QM is not my native tongue. :) All scenarios where QM is invoked that I am used to involve parameters that do not commute, but I suppose I've never truly asked myself if QM is necessary to describe scenarios wherein you are not concerned with this...

Goood Day, I have a cubic root equation. I use Newton-raphson for finding the roots. I want to do parameter estimation (tuning of the equation parameters to be able to give better prediction) using experiment data. Can anyone help me on how to do this? Thanks for your anticipated help...

Hi, I would like to score an item. The item has around 10 parameter. Each parameter is depics how it reacts to each tests. Some parameters are just Yes or No. Few other parameters give the percentage of their performance in that particular test. And the remaining are scores. I want to...

First note that I am just learning Mat lab, and running a program created by someone else. I have a program which is displaying four differential equations on screen, all with various parameters assigned in the beginning. i.e. alpha=10; beta=0.04; gamma=0.020; etc. For...

I read recently that "...at present only GR theory predicts the required 13 parameters for agreement with critical observations that have been made." Is there a list of those somewhere?

Hi, I'm a third year electrical engineering student, but I am currently doing a mechanical engineering project. I would really appreciate any help as I'm a bit behind in my mechanical engineering knowledge. I understand that torque is just the turning force on an object, i.e the force...

Torque is just the turning force on an object, i.e the force multiplied by the perpendicular distance from the force to the pivot. But when torque parameters are mentioned in mechanical engineering papers, what are they referring to? It's the plural "parameters" that's confusing me. Is it the...

Greetings. I am not sure how to approximate a MOSFET's switching energy from datasheet parameters. I have stumbled upon a few ways, but in all cases I've found it is pretty rare to find a datasheet with all the correct parameters. Here are some ways I've found: 1) Eon and Eoff are listed...

Hi all, I am wondering about the actual technological parameters of a modern MRI. In particular I mean sensitivity, i.e. the order of magnitude of the signals to be detected and the noise levels in practice. Can somebody recommend a good reference about the subject from an engineering...

I have several data points with error bars, and these error bars are different sizes for each of the data points. I'd like to fit a model function to them which has non-linear parameters, and be able to get error bars on the model parameters, ie. if my model is something like f(x) = A +...

This dilemma seems to occurs all the time in so many different engineering problems. It seems impossible to optimise something with multiple parameters, for three reasons: There are too many possible combinations of these parameters to be able to simulate them all You optimise one...

hey i am engineering student i am interested in designing a ic engine. I want to know necessaries and parameters for designing a engine hey please provide some reference for it thank you:smile:

Homework Statement $$y'' - 2y = x + 1$$ Homework Equations $$ y_{o} = Ae^{√(2)x} + Be^{-√(2)x} $$ $$ v_{1}'e^{√(2)x} + v_{2}'e^{-√(2)x}\equiv 0 $$ $$ √(2)v_{1}'e^{√(2)x}-√(2) - v_{2}'e^{-√(2)x} = x + 1 $$ The Attempt at a Solution $$ v_{2}' = \frac{x+1}{-2√(2)e^{-√(2)x}} $$ $$...

Could you have a hypothetical universe with only photons, electrons, and positrons by adjusting the parameters of the Standard Model to eliminate all the "other" stuff? If so is String Theory flexible enough to model a hypothetical universe with only photons, electrons, positrons, and...

Show that for positive parameters $a$, $b$, and $c$, $$ \int_{0}^{\infty} \left( \frac{e^{-ax}-e^{-bx}}{x^{2}} + (a-b) \frac{e^{-cx}}{x} \ \right) \ dx = b-a + a \ln \left(\frac{a}{c} \right) - b \ln \left(\frac{b}{c} \right)$$

Homework Statement As the title indicates. I'm given two independent exponential distributions with means of 10 and 20. I need to calculate the probability that the sum of a point from each of the distributions is greater than 30. Homework Equations X is Exp(10) Y is Exp(20) f(x) =...

Level function [L(x,y,z)] = (1/r^2) (x^2 + y^2 + z^2) = 1 Vector [N([x(h,g)], [y(h,g)], [z(g)])] = parametric equation to sphere Level function [L(x,y,z)] The parametric equations have 2 parameters, h and g [x(h,g)] = (r [sin (a + gv)]) [cos (b + hw)] [y(h,g)] = (r [sin (a + gv)]) [sin (b +...

I use the least squares method in a small C-programm to fit some data points. But don't know how to get the errors of the calculated parameter.

Hi guys, I'm a bit rusty on optimization, but i remember enough to be able to setup some problems that I am facing in my research, and would like to know how to go about solving such problems in general. The equations below may have more variables and be in slightly different forms at times...

Homework Statement The problem is attached as TheProblemAndSolution.png, and everything is typewritten, so it should be easily legible (but you will likely need to zoom into read the text since the image's height is significantly larger than its width). Homework Equations Differential...

Hello. The problem is : I've got an expression to optimize with 7 free parameters. Ranges for each parameter are given. the simpliest way to optimize is to organize a program like for { for {for ...}} for each parameter and to get the result. Are there any other methods for solving the problem...

Homework Statement I'm trying to work out how the expression: $$H^2 = H_0^2 \left [ \Omega_0 \frac{a}{a_0} + 1 - \Omega_0\right]$$ can be deduced from Friedmann's first equation: $$H^2 = \frac{8\pi G \rho}{3} - \frac{kc^2}{R^2}$$ And I have a number of questions. Firstly, I've often seen the...

Dear All, I would like to do an exponential function least-squares fitting, but having two or more exponents. For example the function looks like this: y (x) = A \exp (-x/a) + B \exp (-x/b) where A, a, B and b are the least-squares fitted parameters. My question is how to obtain the...

Hello all, What is the result of this (linear) convolution: s(t)\star\delta(\tau-\tau_p) where s(t) is a continuous signal, δ is the Dirac delta function, and \tau_p is a constant. Thanks in advance