It is a computer code - program for solving electromagnetic wave propagation
207395
Hope this helps!\ntry digging deeper into this source, or contacting the authors of the article:  \nhttp://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHPAEN000005000012004253000001&idtype=cvips&gifs=yes\n\nWave propagation and absorption simulations for helicon sources\nY. Mouzouris and J. E. Scharer \nDepartment of Electrical and Computer Engineering, University of Wisconsin, Madison 53706 \n\n(Received 22 June 1998; accepted 16 September 1998) \n\nA two-dimensional (2-D), finite-difference computer code is developed to examine helicon antenna coupling, wave propagation, collisionless Landau, and collisional heating mechanisms.  The code calculates the electromagnetic wave fields and power absorption in an inhomogeneous, cold, collisional plasma.  The current distribution of the launching antenna, which provides the full antenna spectra, is included in the model.  An iterative solution that incorporates warm plasma thermal effects has been added to the code to examine the contribution of collisionless (Landau) wave absorption by electrons.  Detailed studies of the wave fields and electron heating profiles at low magnetic fields (B0 < 100 G), where both Trivelpiece–Gould (TG) and helicon (H) modes are present, are discussed.  The effects of the applied uniform magnetic field (B0 = 10–1000 G), 2-D (r,z) density profiles (ne0 = 1011–1013 cm–3), neutral gas pressures of 1–10 mTorr and the antenna spectrum on collisional and collisionless wave field solutions and power absorption are investigated.  Cases in which the primarily electrostatic (TG) surface wave dominates the heating and the power is absorbed near the edge region and cases in which the propagating helicon wave transports and deposits its energy in the core plasma region are examined. ©1998 American Institute of Physics. \n\n\nPII: S1070-664X(98)04812-5 \ndoi:10.1063/1.873161 \nPACS: 52.35.-g, 52.65.-y, 52.25.Kn        Additional Information \n\nView ISI's Web of Science data for this article: [ Source Abstract  | Citing Articles web site:  http://cel.isiknowledge.com/CIW.cgi?&CustomersID=AIP&Func=Links&ImgLogo=http%3A%2F%2Fimages.isiknowledge.com%2FWoK3%2FImages%2FLinks%2FWOK3%2Ftbretpub.gif&PointOfEntry=CitingArticles&PublisherID=AIP&ReturnLink=http%3A%2F%2Flink.aip.org%2Flink%2F%3FPHP%2F5%2F4253%2F1&ServiceName=TransferToWos&ServiceUser=Links&UT=000077031000019&e=pztPCHcbmv_qbFN_ifMSSbBEWAIv3mBw3LKMQhUlYHFB_dj0fYv3mk7doRbRSgjY  | Related Articles web site:  http://cel.isiknowledge.com/CIW.cgi?&CustomersID=AIP&Func=Links&ImgLogo=http%3A%2F%2Fimages.isiknowledge.com%2FWoK3%2FImages%2FLinks%2FWOK3%2Ftbretpub.gif&PointOfEntry=RelatedRecords&PublisherID=AIP&ReturnLink=http%3A%2F%2Flink.aip.org%2Flink%2F%3FPHP%2F5%2F4253%2F1&ServiceName=TransferToWos&ServiceUser=Links&UT=000077031000019&e=ZgR.yeikjZepmz3J.e_XVPbuOHSKuX5ZD_8WPite_wec_dKVJZcLVSMLsQ7Qg_Tl  ]
277356
E = h*c/wavelength  h = 6.634x10^-34 J*s
469418
Because up to a few years ago it was always the easiest and cheapest method to transmit and receive broadcasts with.  The first system invented (discovered ?) by Marconi was an analogue system and it has stayed that way since.  \n\nActually, the terms 'analogue' and 'digital' only apply to the modulation methods used;  once the modulated signal leaves the radiating antenna it travels as an analogue electro-magnetic wave through space regardless of which type of modulation is used.
87727
I think you're talking RF not audio and the given C value sounds just fine. We pretty much agree except for the decimal point, unless you are using a comma for the d.p.\nI get f = v/lambda = 299792458/5.7 = 5.259517E+07 Hz, \nw = 2*pi*f = 3.304652E+08 rad/s, and \nL = 1/(w^2*C) = 1/(1.092072E+17*1.9E-12) = 4.819422E-06 H or 4.819 uH.
280091
It looks like geek code to me.\n\nhttp://www.google.com/search?q=%22geek+code%22
75591
Radio waves store the information in the amplitude and frequency of the wave.\n\nIt is similar to how the voltage in a computer to create the 1s and 0s that make up the information you see on the screen.
86169
Consider looking at some of the implementations which\nare available on the net (both source code as well\nas functioning web-interface-implementations).\n\nhttp://www.alpertron.com.ar/ECM.HTM\nhttp://www.boo.net/~jasonp/qs.html
402964
&*%%@TB$@IYBX^($@)(&^&!!!!BEEP!!
481910
looks like a nice programming assignment.  I hope you have fun!
77685
Electro-magnetic radiation is a carrier of electro-magnetic energy by transmitting the oscillation of the electro-magnetic field through space or matter. The transmission of electro-magnetic radiation is derived from the Maxwell equations. Electro-magnetic radiation has the characteristics of both wave motion and particle motion. \n\n(1) Characteristics as wave motion \nElectro-magnetic radiation can be considered as a transverse wave with an electric field and a magnetic field. A plane wave for an example as shown in Figure 1.2.1 has its electric field and magnetic field in the perpendicular plane to the transmission direction. The two fields are located at right angles to each other. The wavelength L  , frequency F and the velocity V have the following relation. V = L/F\n\nElectro-magnetic radiation is transmitted in a vacuum of free space with the velocity of light c, ( = 2.998 x 108 m/sec) and in the atmosphere with a reduced but similar velocity to that in a vacuum. The frequency n is expressed as a unit of hertz (Hz), that is the number of waves which are transmitted in a second.\n\n(2) Characteristics as particle motion\nElectro-magnetic can be treated as a photon or a light quantum. The energy E is expressed as follow.\nE = h \nwhere h : Plank's constant\n : frequency \n\nThe photoelectric effect can be explained by considering the electro-magnetic radiation as composed of particles. Electro-magnetic radiation has four elements of frequency (or wavelength), transmission direction, amplitude and plane of polarization. The amplitude is the magnitude of oscillating electric field. The square of the amplitude is proportional to the energy transmitted by electro-magnetic radiation. The energy radiated from an object is called radiant energy. A plane including electric field is called a plane of polarization. When the plane of polarization forms a uniform plane, it is called linear polarization. \n\nThe four elements of electro-magnetic radiation are related to different information content as shown in Figure 1.2.2. Frequency (or wavelength) corresponds to the color of an object in the visible region which is given by a unique characteristic curve relating the wavelength and the radiant energy. In the microwave region, information about objects is obtained using the Doppler shift effect in frequency, that is generated by a relative motion between an object and a platform. The spatial location and shape of objects are given by the linearity of the transmission direction, as well as by the amplitude. The plane of polarization is influenced by the geometric shape of objects in the case of reflection or scattering in the microwave region. In the case of radar, horizontal polarization and vertical polarization have different responses on a radar image.\n\nAny wave function can be defined in terms of amplitude, A, and wave-length,  or frequency, v . A full description of such a wave also requires definition of a phase, phi . A simple one-dimensional wave-function, f(x), specifies the height of the wave at any horizontal point x where x is defined in terms of wavelength such that x=1=. This wave function could be represented as either a sine or a cosine function as follows: \n\nf(x)= Acos2pi(vx+o)
32321
Details of the algorithm for conversion along with\nsource program written in C can be found at.\nhttp://www.codepedia.com/1/Art_Expressions_p1\n\nA good short article on this topic.\nhttp://www.cs.man.ac.uk/~pjj/cs2121/fix.html
430594
OK, here they are verbally:\n\n"Maxwell's four equations express, respectively, how electric charges produce electric fields (Gauss' law), the experimental absence of magnetic monopoles, how currents and changing electric fields produce magnetic fields (the Ampere-Maxwell law), and how changing magnetic fields produce electric fields (Faraday's law of induction)." [See source.]\n\nGauss' Law--simply says electrons in motion will create a force field around the current.  This law follows the inverse square of the distance rule and the phenomenon is the basis for radio and TV broadcasting waves.\n\nThe monopole equation simply says that there must be both a north and south pole in magnetism.  (However, sometimes fictitious monopoles are used mathematically to solve some problems.)\n\nThe Ampere-Maxwell equation links changing electrical current to the creation of magnetic flux.  The Faraday equation links changing magnetic flux to the creation of electrical current.  This is the stuff that electric motors and electric generators are made of.\n\nThe Maxwell equations have a lot of practical applications.  Wave guides, such as for high powered radars, and coax cables, like for your TV, are designed using Maxwall equations.
428580
pulse-code modulation - \na system of radio transmission in which successive electromagnetic waves of short duration are sampled periodically, quantized, and transmitted by code. \nEx. The result was the rapid development of pulse-code modulation ... as a rival to amplitude modulation (AM) and frequency modulation (FM)
23428
Walsh codes are generated from a Hadamard matrix. Try this link:  http://mathworld.wolfram.com/WalshFunction.html\n\nFor more info on cell phone application, see page 552, Peterson, Ziemer, and Borth, "Introduction to Spread Spectrum Communications", ISBN 0-02-431623-7
25555
High frequency radio waves. Around 1700 Mhz.
184500
I teach fortran but not sure about the field you are refering to but if it is well known field in your area of academics there has to be code of such programs in the labrary database of your field. I'm pretty sure it will not be free
526042
Code:\nsyms x\n\ny= x^2 + sin(x) - erf(x)\n\ndy=diff(y,'x')\n\nSuggestion: read the help for sym/diff which is very different than a numerical diff like you are working with.