201 |
Electromagnetic wave propagation on helical conductorsJanuary 1951 (has links)
Samuel Sensiper. / Based on the author's (Sc. D.) thesis, Dept. of Electrical Engineering, Massachusetts Institute of Technology, 1951.
|
202 |
Electromagnetic waves in iris-loaded wave-guidesJanuary 1947 (has links)
by J.C. Slater. / "September 19, 1947." / Bibliography: p. 18. / Army Signal Corps Contract No. W-36-039 sc-32037
|
203 |
Integral equation formulation for object scattering above a rough surface /Rockway, John Dexter. January 2001 (has links)
Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (leaves 150-155).
|
204 |
Experimental study of micro air vehicle powered by RF signal at 10 GHz /Tsolis, George. January 2003 (has links) (PDF)
Thesis (M.S. in Systems Engineering)--Naval Postgraduate School, December 2003. / Thesis advisor(s): David C. Jenn, Jeffrey B. Knorr, Kevin Jones. Includes bibliographical references (p. 111-114). Also available online.
|
205 |
A self-consistent model of helicon dischargeChen, Guangye, 1976- 06 September 2012 (has links)
We developed a self-consistent model of helicon discharges, motivated by a number of applications. One example is a plasma-based space propulsion system that employs a helicon discharge as its plasma source. Our study of helicon discharges involves two steps. An electro-magnetic wave solver is first developed to study wave phenomena and power deposition. In this work, we model a resonant response of the discharge observed in a recent experiment. The radially localized helicon (RLH) wave is identified as the primary mechanism of rf-power deposition into the plasma. The second step is to take into account electron heat transfer and ion transport so that a self-consistent simulation can be performed. As a case study of validating the model, we simulated one of Boswell’s early experiment in which a jump of plasma density in a scan of external magnetic field is observed. Calculation shows that a classical heat transport is unable to sustain the plasma density profile observed in the experiment. Solutions comparable to the experiment are obtained only when extra heat conductivity is used. The density profiles and excited wave-lengths are in good agreement with the experiment. Especially, the dual-stable solution of the simulation supports the observed plasma density jump. / text
|
206 |
Control of geometry error in hp finite element (FE) simulations of electromagnetic (EM) wavesXue, Dong, 1977- 28 August 2008 (has links)
Not available / text
|
207 |
ELECTROMAGNETIC WAVE TRANSIENTS INTERACTING WITH A DISSIPATIVE STRATIFIED MEDIUMPapazoglou, Thales Michael, 1945- January 1974 (has links)
No description available.
|
208 |
A theory of the scattering of electromagnetic radiation in the troposphereShaver, Harry Nicholson, 1935- January 1958 (has links)
No description available.
|
209 |
A new method for the detection and correction of errors due to interior resonance for the problem of scattering from cylinders of arbitrary cross-sectionSeidel, David B. January 1974 (has links)
No description available.
|
210 |
Electrostatic waves and solitons in electron-positron plasmas.Gray, Greer Jillian. January 1998 (has links)
The magnetosphere of pulsars is thought to consist of an electron-positron
plasma rotating in the pulsar magnetic field (Beskin, Gurevich & Istomin
1983; Lominadze, Melikidze & Pataraya 1984; Gurevich & Istomin 1985). A
finite, and indeed large, longitudinal electric field exists outside the star, and
may accelerate particles, stripped from the surface, to high energies (Goldreich
& Julian 1969; Beskin 1993). These particles may leave the magnetosphere
via open magnetic field lines at the poles of the pulsar. This depletion
of particles causes a vacuum gap to arise, a double layer of substantial potential
difference. The primary particles, extracted from the star's surface,
are accelerated in the double layer, along the pulsar magnetic field lines,
and so produce curvature radiation. The curvature photons, having travelled
the distance of the double layer may produce electron-positron pairs
above the vacuum gap. These first-generation secondary particles, although
no longer accelerating, may synchroradiate, generating photons which may
then produce further electron-positron pairs. These synchrophoton produced
pairs will be at energies lower than curvature photon produced pairs, since
synchrophoton energies are approximately an order of magnitude less than
that of the parent curvature photon.
An attempt to model the electron-positron pulsar magnetosphere is made.
A four component fluid electron-positron plasma is considered, consisting of a
hot electron and positron species, at temperature Th , and a cool electron and
positron species at temperature Tc . The hot components represent the parent
first-generation curvature-born pairs, and the cooler components represent
the second-generation pairs, born of synchrophotons. The hot components
are assumed to be highly mobile, and are thus described by a Boltzmann
density distribution. The cool components are more sluggish and are thus
described as adiabatic fluids. The model is symmetric in accordance with
pair production mechanisms, so that both species of hot(cool) electrons and
positrons have the same temperature Th(Tc, and number density Nh(Nc ) .
In the interests of completeness, linear electrostatic waves in five different
types of electron-positron plasmas are considered. The dispersion relations
for electrostatic waves arising in these unmagnetized plasmas are derived.
Single species electron-positron plasmas are investigated, considering
the constituents to be: both Boltzmann distributed; both adiabatic fluids;
and finally, one species of each type. Linear electrostatic acoustic waves in
multi-component electron-positron plasmas are then considered, under the
four component model and a three component model (Srinivas, Popel &
Shukla 1996).
Small amplitude nonlinear electron-positron acoustic waves are investigated,
under the four component electron-positron plasma model. Reductive
perturbation techniques (Washimi & Taniuti 1966) and a derivation of the
Korteweg-de Vries equation result in a zero nonlinear coefficient, and a purely
dispersive governing wave equation. Higher order nonlinearity is included,
leading to a modified Korteweg-de Vries equation (Watanabe 1984; Verheest
1988), which yields stationary soliton solutions with a sech dependence rather
than the more familiar sech2.
Arbitrary amplitude solitons are then considered via both numerical and
analytical (Chatterjee & Roychoudhury 1995) analysis of the Sagdeev potential.
The symmetric nature of the model leads to the existence of purely
symmetrical compressive and rarefactive soliton solutions. Small and arbitrary
amplitude soliton solutions are compared, and show good correlation.
Under the assumption of Boltzmann distributed hot particles, severe restrictions
are imposed on the existence domains of arbitrary amplitude soliton
solutions. The Boltzmann assumption places a stringent upper limit on the
cool species number density, in order for the solutions to be physical.
An investigation is made of results obtained for an asymmetric electronpositron
plasma (Pillay & Bharuthram 1992), consisting of cold electrons
and positrons, and hot Boltzmann electrons and positrons at different temperatures
Teh and Tph , and number density Neh and Nph . It is found that
the assumption of Boltzmann particles again places restrictions on the acoustic
soliton existence space, and that the results obtained may be physically
invalid. Valid solutions are obtained numerically, within the boundaries of
allowed cool species density values. / Thesis (M.Sc.)-University of Natal, Durban, 1998.
|
Page generated in 0.0276 seconds