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RSS Feed for Wolfram Community showing any discussions in tag Physics sorted by activeHelping Mathematica to recognize the norm of a vector (Assumptions?)
https://community.wolfram.com/groups/-/m/t/1688648
Hi,
in my recent calculations for theoretical physics homework I have to do some bigger matrix multiplikations. It would be nice if Mathematice could recognise for example `Sqrt[b1^2+b2^2+b3^2]` as the norm of my vector `B` or some other name I gave it an advance.
I tried working with Assumptions and (Full-)Simplify but it didn't help in any way.
Thank you for some help!
NicolaiNicolai Anger2019-05-22T18:36:33ZMultivariable derivative rule
https://community.wolfram.com/groups/-/m/t/1685571
When we consider multivariable derivatives related to same variable with different values, there can be a simplification of the manner to calculate a derivative that gives rise to the possibility to calculate by other means the la grangian point at which the total volume mass time expression between two celestial bodies equals , a point at which the distance gives rise to a certain value that express the limit of the derivative to zero and that is equivalent to a distance between the bodies where the value of gravity time multiple is equal meaning that the bodie is pulled in equal terms of proportion.
![proof for the rule of aplied proportion][1]
r1= RandomReal[6471000,{200}] radius of earth in meters
r2=RandomReal[695510000,{200}] radius of the sun in meters
s=RandomReal[149600000000,{200}] distance from the sun in meters
g1=RandomReal[9.86,{200}] gravity of earth
g2=RandomReal[274,{200}] gravity of sun
s2=(g2*r1*s)/(2*r2*g1) interrelated equation to obtain an intermediate distance from earth to the sun
s1=s-s2
a=(r1*s1)/g1 total space mass time relation to earth
b=(r2*s2)/g2 total space mass time relation to sun; both equals each other at a given distance
y=(g2*r1*s1)/(g1*r2*s2) third variable obtained from a rule of proportion that equals the aplication of the theorem for the limit of a derivative
ListPlot[a]
ListPlot[b]
ListPolarPlot[s2]
ListPolarPlot[y]
data=Table[Mod[s2,y],{s2,0,Pi,Pi},{y,0,Pi,Pi}]
ListPlot[data,InterpolationOrder->3, ColorFunction->{s2->Yellow,y->Blue,s1->Green}]
ContourPlot3D[Sin[s2*s1/y] ,{s2,-Pi,Pi},{s1,-Pi,Pi},{y,-Pi,Pi}]
Run the program and notice that the simple proportion between two analogus functions alows to obtain a third variable that is related to the applied principle of limit of a derivative. Notice that a and b have equal values for a certain distance from the sun and from earth expressed in space per mass per second. the distance at this point makes the bodie there located to be in the same relative position.
r1= RandomReal[6471000,{200}]
r2=RandomReal[695510000,{200}]
s=RandomReal[149600000000,{200}]
g1=RandomReal[9.86,{200}]
g2=RandomReal[274,{200}]
s2=(g2*r1*s)/(2*r2*g1)
s1=s-s2
a=(r1*s1)/g1
b=(r2*s2)/g2
y=(g2*r1*s1)/(g1*r2*s2)
ListPlot[a]
ListPlot[b]
ListPolarPlot[s2]
ListPolarPlot[y]
data=Table[Mod[s2,y],{s2,0,Pi,Pi},{y,0,Pi,Pi}]
ListPlot[data,InterpolationOrder->3, ColorFunction->{s2->Yellow,y->Blue,s1->Green}]
ContourPlot3D[Sin[s2*s1/y] ,{s2,-Pi,Pi},{s1,-Pi,Pi},{y,-Pi,Pi}]
tahnk you , feel free to aply the rule to any other object distance gravity related condition: black holes for instance.
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=DERIVADADEMASSENAMISIEC.jpg&userId=1147177Luis Felipe Massena Misiec2019-05-18T16:57:31Z[WSS17] Mathematica connection to NI - Data Acquisition (DAQ) cards
https://community.wolfram.com/groups/-/m/t/1137025
## [WSS17] Mathematica connection to NI - Data Acquisition (DAQ) cards ##
I have controlled hardware devices through serial ports, GPIB ports, USB ports using SerialRead/Write and NI - VISA from Mathematica. Here at WSS17, I wanted to control NI - DAQ cards using Mathematica. Through all these device communication protocols, large number of devices can be controlled which enables me to run my experiments efficiently using Mathematica.
DAQ cards are used for efficient measurements as they are compact and occupy less space than traditional devices. NI-DAQmx is an efficient driver to control NI-DAQ cards. In WSS17, I developed Mathematica-DAQmx Link ("DAQmxLink"), which links NI-DAQ cards with Mathematica through the communication between Mathematica NETLink and NI-DAQmx .
![Project structure][1]
You can find the detailed code [Git link][2]
## Further Reading on DAQmx ##
More on [DAQmx .NET object][3]
## NI - DAQ - Test ##
usb6000 = DeviceOpen["DAQmx"]
![enter image description here][4]
ListPlot[DeviceReadBuffer[usb6000, 10000, "source"]]
![enter image description here][5]
I can read the individual data too.
Table[DeviceRead[usb6000], {i, 1, 10}]
![enter image description here][6]
This is the basic connectivity between Mathematica and NI DAQmx.
[1]: http://community.wolfram.com//c/portal/getImageAttachment?filename=final.jpg&userId=1122758
[2]: https://github.com/sumanban/HW_submit/blob/master/HW_suman%20_fin.nb
[3]: http://zone.ni.com/reference/en-XX/help/370473H-01/mstudiowebhelp/html/a648a297/
[4]: http://community.wolfram.com//c/portal/getImageAttachment?filename=output1.jpg&userId=1122758
[5]: http://community.wolfram.com//c/portal/getImageAttachment?filename=output2.jpg&userId=1122758
[6]: http://community.wolfram.com//c/portal/getImageAttachment?filename=out3.jpg&userId=1122758Suman Banerjee2017-07-05T21:10:28ZUse Simpson2D rule?
https://community.wolfram.com/groups/-/m/t/1684536
I want to know how to use Simpson2D rule. I got confused, because on
http://mathfaculty.fullerton.edu/mathews/n2003/simpsons2Drule/SimpsonsRule2DMod/Links/SimpsonsRule2DMod_lnk_5.html
it gives the rule as Simpson2D[a,b,c,d,m,n] where c, d are lower and upper limits of the integration dx, and a, b are lower and upper limits of the integration dy. From the context it seems the function must be in the form of f(x,y). However, when I use the rule, to find out
va1=Simpson[a,b, c. d,m, n],
a=0, b=1.26, c=0.17,d=0.44, m=10,n=10
I got an answer
Smpson2D[1, 1.2, 0.17, 0.44, 10, 10]
I want to know: 1. how to specify the function, does it have to have the form f(x,y) 2. How to write the syntax. For example, if f(x,y)= Sin[x] Cos[y], integrate from x=0 to 1, from y=0.1 to 0.2. how to write the syntax so that I can get a numerical answer answer.
This is my actual file. Only the last 6 entries deals with the use of Simpson2D
Your help will be much appreciated.
Hong-Yee Chiu, hongychiu@gmail.comHong-Yee Chiu2019-05-16T20:17:34ZInternal dosimetry: BIOKMOD WEB expanded including ICRP I30/134/137 models
https://community.wolfram.com/groups/-/m/t/1685662
I inform people interesting in Internal Dosimetry and Health Physics used in Radiation Protection that BIOKMOD WEB (a web application developed using web Mathematica ) has been expanded to include the newest ICRP 130/134/137 biokinetic models. It can be used to internal dosimetry and bioassay evaluation. According to my knowledges it is the only web application that use the ICRP 130/134/137 biokinetic models to bioassay evalution. Apart from Single or Acute intake, chronic and chronic that cease intake can be assumed.
Visit: http://oed.usal.es/webMathematica/Biokmod/ :> ICRP 130/134/137 models.
Please, If you have some comments send me an e-mail: guillermo2046(at)gmail.com.
http://diarium.usal.es/guillermo
Guillermo SánchezGuillermo Sanchez2019-05-18T16:00:49Z