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RSS Feed for Wolfram Community showing any discussions in tag Physics sorted by activeObtain the field intensity at a certain position of a maser interferometer?
http://community.wolfram.com/groups/-/m/t/1329310
Hey guys,
I would lik to know how normalizing these figures giving by this programm for obtaining the field intensity at an arbitrary off-center for exemple at x=0.5a in order to find the samme valeus as given in Resonant Modes in a Maser Interferometer by using equation 26:
Exp[I*0.25*Pi]/(2*Sqrt[d])*\[Integral](Exp[-I*k*Sqrt[b^2 + (x1 - x2)^2]]/ Sqrt[Sqrt[b^2 + (x1 - x2)^2]])*(1 + b/Sqrt[b^2 + (x1 - x2)^2])
By A. G. FOX and TINGYE Ll (Manuscript received October 20, 1960) articl.
(==================================================================)
(* lam=d; a=25d;b=100d ; k=2[Pi]/d)-one Trip // 0 < x2 < 1 a)
(==================================================================)
d = 1; lam = d; a = 25*d; b = 100*d ; k = 2 [Pi]/d
x2 = Table[x2, {x2, 0, 1, 0.01}]*a
f1 = (Exp[-IkSqrt[b^2 + (x1 - x2)^2]]/ Sqrt[Sqrt[b^2 + (x1 - x2)^2]])*(1 + b/Sqrt[b^2 + (x1 - x2)^2])
g1 = NIntegrate[f1, {x1, -a, a}]
fact = Exp[I*0.25Pi]/(2*Sqrt[d])
g2 = fact*g1
Abg = Abs[g2]
ListLinePlot[Abg]
Ag = Arg[g2]
ListLinePlot[Ag]
Please see my attachment for more details.
Thanks in advance.MOUMA MIRAL2018-04-29T09:56:57ZHow to use Fit-Parameters
http://community.wolfram.com/groups/-/m/t/1345180
Hello community, I have a question about fitting.
How can i use the parameters which i get from a fit?
I know how to list them ("ParameterTable"), but i want to use them in further calculations by not just copying the values. I tried to just use the variable that I used as fit parameter, but that doesn't work.
Here (http://reference.wolfram.com/language/howto/GetResultsForFittedModels.html) it says how to get t-Statistics an P-Values, but not how to get the fit-parameters and their error.Thomas Vergeiner2018-05-25T16:48:17ZPlot with VectorPlot over a region
http://community.wolfram.com/groups/-/m/t/1345317
Hello.
First time here for me.
I want to plot the vector field A,
![enter image description here][1]
over the region
![enter image description here][2]
I tried the following:
VectorPlot[{y, -x}, {x, y} \[Element] (1/4 < x^2 + y^2 && x^2 + y^2 < 9)]
But it doesn't work, although
RegionPlot[1/4 < x^2 + y^2 && x^2 + y^2 < 9, {x, -4, 4}, {y, -4, 4}]
does return the correct region.
Can someone give me any kind of help with it? Or explain where is the syntax error?
[1]: http://community.wolfram.com//c/portal/getImageAttachment?filename=10515CodeCogsEqn.png&userId=1344988
[2]: http://community.wolfram.com//c/portal/getImageAttachment?filename=4087CodeCogsEqn.png&userId=1344988Udi Behar2018-05-24T21:27:33Z