Parameters Definition and 489 Threads

I'm wondering about the Kerr Optical effect as described on wikipedia: http://en.wikipedia.org/wiki/Kerr_effect Are there limits to the range of parameters at which the effect starts to break down? What λ values and E values does this formula apply to?

Points A,B are on circle C ,segment MN is a diameter of circle C, and point P is on segment MN , if : $\angle CAP=\angle CBP =10^o ,\,\, \overset{\frown} {MA}=40^o,\,\, find :\,\, \overset{\frown} {BN}=?$

Possible "criteria" or parameters for planetary collision? Suppose a computer model were created to simulate two proto-type planets on a collision course (for example, the Earth-Moon collision in the Hartman theory of the Moon formation). We know that the Moon is spiraling outwards (tidal...

two-port network transmission parameters?? Homework Statement Homework Equations t[A B]=[t11 t12] [C D]=[t21 t22] The Attempt at a Solution so, first thing i did was find the equivalent capacitance/inductance. C(eq)=-j0.5 and L(eq)=j0.5. using these values as I was confused by parametric...

Hi... first post here! Sorry if not in the right place. I am trying to decode the parameters for an xml file format and I would appreciate help in interpreting some parameters. I know the thing specified is a "transition curve" or clothoid curve, as the transition between a straight path and...

Can I do this: sup_(x,y) f(x,y) = sup_y sup_x f(x,y) ?

Hello, I am approximating a helix by parts of torus, to build an optical fiber wrapped around a cylinder simulation. Due to the software limitations, there is no easier way. So I take a part of the torus, rotate it so the one end points slightly up, connect similar part of the torus to the...

I am working on the following problem: Can someone please show or explain the steps to invert the phi matrix? I've given it a few tries, but I can't reach what the book has for the answer. Please help! Thanks

Homework Statement I have a system of two equations: 3*x^2 - x + 3*y^2 = 0 2*x^2 - y + 2*y^2 = 0 Homework Equations The Attempt at a Solution I don't know how to express one with the other.I mean I can either have x = 3*y^2 + 3*x^2 or y = y = -2*y^2 - 2*x^2 and in both cases it...

I was just curious. I have a program that asks for input file name and output name when the console is executed. I needed to run it and automatically pass these file names. I found a way.. test.exe <files.tmp where files.tmp has 2 lines. First line is name of input file, second is output...

Homework Statement Four 3-vectors a, b, c, and d are related by the equation ax + by + cz = d; where x, y, and z are real parameters. Using a suitable combination of scalar and vector products, findd x, y, and z in terms of the vectors Homework Equations The Attempt at a...

In describing the length of a curve in spacetime it is necessary to parametrize it and in GR one comes across the notion of affine parameters. One definition of affine parameters u are parameters which are related 'affinely' to the length of the curve s trough u = as + b where a and b are...

(I have trouble in finding the stroke length and fuel flow rate) From Heywood,E2.11 You are designing a 4 stroke CI to provide a brake power of 300kW,Naturally aspirated at its max rated speed.Based on typical values for brake mean eff.pressure(bmep){700kPa to 900kPa} and max mean piston...

Hi everyone, :) One of my friends gave me the following question. I am posting the question and the answer here so that he could check his work. Question: This question concerns the differential equation, \[x\frac{d^{2}y}{dx^2}-(x+1)\frac{dy}{dx}+y=x^2\] and the associated homogeneous...

Homework Statement "Eliminate the parameter and graph the plane curve represented by the parametric equations." x=t^2, y=t-1; -1 ≦ t ≦ 3 Homework Equations The Attempt at a Solution No need for you guys to graph; I can do that on my own. It would be a lot of work to have you guys...

Hi guys :smile: This question has been bugging me for a REALLY long time so thanks in advance for the help :biggrin:! Homework Statement Calculate the Hybrid Parameters for an inverting op amp shown below: https://www.dropbox.com/s/45mjldud2ar5pwg/invOpAmp.jpg And I need to get it...

Homework Statement A particle of mass m is moving in a repulsive inverse square law force ##\mathbf{F}(\mathbf{r}) = (\mu/r^2)\hat{r}##. Given that ##u(\theta) = -\frac{\mu}{mh^2} + A\cos(\theta - \theta_o)##, 1) Determine the paramters of the (far branch of the)hyperbolic orbit...

I'd like to know the dimensionless parameters affecting a counter-flow induced draft cooling tower's performance, or if someone could direct me to an adequate resource . I'd also appreciate if I could be directed to some good comprehensive resources on cooling tower design Thanks guys

Maybe somebody can help me with the following question on batteries: I have several batteries which I have to charge from different sources. I have solar panels on the roof of my RV, 2 by 3 meters. On a sunny day, they can charge maybe the equivalent of a 100 ah battery. But if I run...

Hello, Suppose, 1. I have a function f=C1 + C2/((C3-X)^C4); where Cn is a constant; I'm looking at the Havriliak-Negami equation which has some 5 constants. 2. I have a data set whose least-squares fit looks like a curve, How can I compute the values of the function's parameters C1 to...

Hi all, I have a ground excited single degree of freedom model, like that: http://www.bsw-schwingungstechnik.de/fileadmin/user_upload/images/2/graphic-passiv-isolation.jpg I know the excitation function, i.e. s(t), but I need to know the force that imposes a specific s(t). I need it...

See attached PDF for details: How do I calculate errors on the fit parameters, p?

Here is the question: Here is a link to the question: Curve Tangent Question? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

[SIZE="4"]The next situation is presented 2 big circles (blue ones) are rotating in different directions. The left one is rotating clockwise and the right one rotates counter clockwise. Inside the 2 big circles, 2 small circles (pink ones) are embedded...

This isn't a homework question per se but it's a question that I had while reading through my textbook so I think it's appropriate here. I just started studying Quantum Mechanics and so am getting familiarized with the meaning of wave functions and their behavior. One question I can't seem to...

Take for example a system \frac{dx_i}{dt}=(x_i,t,a,b,...) i-number of state equations. What would be the maximum number of parameters permitted for this system of non-linear differential equations? Is it finally determined by the solution space?Is there a criteria for number of...

Homework Statement The equation that has to be solved: y'' - y' - 2y = 2e^(-t) The problem I am having is that I don't understand why they equatate that part with the derivatives of the u parameters to 0. (see image) Here they first find the characteristic equation and write down...

Hello, I've got some data on an epidemic in various locations - the total number of agents and number killed by the infection after 1 year. -This gives gives me a distribution of percentages of the populations that have been killed by the infection. (but all the percentage values are relatively...

Homework Statement Assuming that the sun lies at the principal focus of the solar system, and given that the semi-major axis and eccentricity of Mars is 1.5237 AU and 0.0934 respectively, calculate: The distance (in AU) when Mars is closest to the Sun (known as perihelion). The angle θ=0°...

Homework Statement Say we have a 2D rigid body transform, with parameters p = [ p_1,p_2,p_3] for rotation, x translation and y translation respectively. I'm using the transform to .. transform an image. Is there a way to have: For a point x , y : x',y' = transform(x,y,p) <=> x,y =...

I've a small wind turbine that is rated at about 24V. The turbine produces AC voltage but it's got an internal recifier converting this to DC. I need to create an embedded system that measures the output of this turbine displaying AC voltage, current and power output. I did some research...

The ODE to solve via variation of parameters is ##(1-x)y''+xy'-y=(1-x)^2##. Knowing that ##e^x## and ##x## are solutions to the homogeneous ODE. Now if I call ##y_1=x## and ##y_2=e^x##, the Wronskian is ##W(y_1,y_2)=e^{x}(x-1)##. According to...

Homework Statement I must solve ##y''+2y'+2y=e^{-t}\sin t##. I know variation of parameters might not be the fastest/better way to solve this problem but I wanted to practice it as I never, ever, could solve a DE with it. (Still can't with this one). Though the method is supposed to work...

x²y"(x)-3xy'(x)+3y(x)=2(x^4)(e^x) =>y"(x)-(3/x)y'(x)+(3/x²)y(x)=2x²e^x i don't know how to approach this problem because the coefficients are not constant and i am used to being given y1 and y2 HELP!

1. I need help understanding how to read the parameters from the stack and not from anywhere else. In addition, what is difference between reading from the stack and somewhere else? For example, if the parameters had this: logicUnit(unsigned long int value, unsigned long int flags, unsigned...

I just posted about the new parameters here: https://www.physicsforums.com/showthread.php?p=4152380#post4152380 Basically the new numbers look rather close to what Jorrie already put as the default in his calculator. zEQ looks familiar. Hubble rate 70 looks familiar :biggrin: Here's the...

the lines l2[/SUB and l3 are given by l1 : r = 10i + j + 9k + μ(3i+j+4k) l2: x= (y+9)/2= (z-13)/-3 l[SUB]3 r= -3i-5j-4k + λ(4i+3j+k) where mu and lambda are parameters. d) Show that AC=BC A(4,-1,1) this was given, I calculated and got B as (5,-1,-2) and C (1,-2,-3) This I...

Homework Statement Asked to find Weibull distribution parameters, \theta and \tau, using Excel's Solver feature. I know that the 25th percentile is 1500 and the 75th percentile is 250000. Homework Equations Weibull CDF = 1-exp(-(x/\theta)^\tau) The Attempt at a Solution I have...

I'm trying to find the tri-linear interpolation parameters of a point C within a hexahedron of 3d vectors (C000, C100, C010, C011 etc) You could call this "inverse tri-linear interpolation" Ive used the same variable names as this wikipedia article...

Here's the proof that I read for method of variation of parameters- https://www.physicsforums.com/attachment.php?attachmentid=52267&stc=1&d=1351081780 What I couldn't understand is that how could one simply assume that u'1y1+u2'y2=0 and u'1y'1+u2'y'2=g(x) I just don't understand...

I wonder if TOE candidate theories (loop gravity, superstrings, twixtors, or <you-name-it>) predict from the first principles SM parameters (all, some of them, or some correlations like Koide formula)? If they don't predict SM parameters, then the only option is "10**500 different universes...

I was recently trying to prove the variation of parameters formula for an nth degree equation, and I have come up with a question about the assumptions made during the derivation. During the derivation we assume that: u1'y1(k) + u2'y2(k) + . . . + un'yn(k) = 0 for k < n-1. It leads to the...

Find a, b parameters such that the function such that the function $f(x)= (sin2x)/(a-bcosx)$ has extreme value in point (pi/3,1/4)

Homework Statement A is a given 3x3 matrix A= \begin{pmatrix} a & 0 & 1 \\ 0 & a & b \\ 0 & 0 & c \end{pmatrix} a,b,c are real numbers 1) determine for what values of a,b,c the matrix A is diagnoizable. (advice: distinguish between the cases a=c and a≠c) Homework Equations...

Hello, I stumbled across the following equation in a presentation about collider physics: tcorrWV =(tiRV - tiWV) + (TOFRV - TOFWV), where tcorrWV is the corrected time for the wrong vertex, tiRV is the initial time of the right vertex, tiRV is the initial time of the wrong vertex...

Homework Statement see attached Homework Equations The Attempt at a Solution $$\eqalign{ & {V_1} = {Z_{11}}{I_1} + {Z_{12}}{I_2} \cr & {V_2} = {Z_{22}}{I_2} + {Z_{21}}{I_1} \cr & {\rm{ - - - - - - - - - - - - - - - - - - - - - - - - - - - }}...

Help please...Transmission line parameters in per unit hello there I'm trying to work on a program that converts electrical quantities of transmission line ( R , L , and C ) into per unit system using Matlab the thing is that I'm finding difficulties with the formulas , how I can obtain...

I read that conventional (low frequency) circuit parameters - voltage gain and power gain are not applicable for RF circuits but I didn't understand why? Can anyone please explain.

Hi dear friends, I am Maziar Bahiraee a chemical engineering graduate. I had a question about one of my last inventions and I found that friends this group are specialized in this field. Q: After a wave with specific parameters encounters an obstacle, which of the parameter(s) is changed and...

Homework Statement The Attempt at a Solution So I was wondering whether or not, in an instance of n observations and k explanatory variables, where the following is an accurate statement: That is, the estimate of beta_1 found by only regressing y on x_1 is equal to the the true multiple...