Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 1650 for “"Oscillations"”.
-
Thermionic Space Charge Oscillations
Thermionic electrons emitted into a potential well will produce radiation, the frequency of which is determined by the transit time of the electrons. This paper investigates the case where radiation is produced by a vacuum tube in which two Pierce guns face each other, one acting as the emitter, …
-
Oscillations and Sterile Neutrinos
… all the way up to the discovery of neutrino oscillations, the latest detectors and theoretical extensions to current models. When viewed individually, many of the detector methods and theories for oscillation seem to make overly specific and somewhat arbitrary assumptions. However, upon …
-
Inertial oscillations in the Mediterranean
… the dominant and persistent presence of inertial oscillations, circularly polarized currents having periods of a half pendulum day, the data are among the most striking ever collected. Two contemporary theories have been adapted for interpretation of this data. On the basis of a ray or …
-
Phase dynamics of irregular oscillations
In der vorliegenden Dissertation wird eine Beschreibung der Phasendynamik irregulärer Oszillationen und deren Wechselwirkungen vorgestellt. Hierbei werden chaotische und stochastische Oszillationen autonomer dissipativer Systeme betrachtet. Für eine Phasenbeschreibung stochastischer Oszillationen …
-
Quantum oscillations in Dirac semimetals
… and its corresponding Fermi surface, quantum oscillations have proven very useful as they provide a tool to directly measure the Berry phase under certain conditions. The (double) Dirac semimetal NbTe₄ has shown the occurrence of multiple charge-density-wave (CDW) phases, and as a result a …
-
Magnetic fields and stellar oscillations
… With sufficiently precise photometry, stellar oscillations can be detected through the periodic variations they induce in a star's brightness. Understanding the connection between the internal structure of a star and the properties of its normal modes is the focus of stellar oscillation theory, …
-
Rapid oscillations in cataclysmic variables
Coherent and quasi-periodic rapid oscillations have been seen in the optical and X-ray light curves of more than 30 cataclysmic variables to date. The observational characteristics of these oscillations are reviewed, and current models discussed. To put the observations in context, a detailed …
-
Inertial oscillations in the Mediterranean
Thesis (Ph. D)--Massachusetts Institute of Technology, Dept. of Meteorology, 1970.
-
Fluid oscillations in cylindrical shells
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1961.
-
Plasma oscillations in a laser.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1970. B.S.
-
Frictional oscillations in elastomeric sliding
The impetus for this study was the noise generated by an automotive stabilizer bar, rotating in an elastomeric bushing. The focus of the research is to determine the conditions under which noise or stick-slip occurs. Elastomers tested include natural rubber with 0,5,10, 20, and 50 phr (parts per …
-
Electrostatic oscillations in inhomogeneous plasmas
The problem of longitudinal electrostatic oscillations in inhomogeneous, one-dimensional plasmas is examined in several areas. First the question is considered regarding whether the Vlasov-Maxwell equations will allow a plasma system to evolve naturally toward a preassigned stationary, …
-
Mathematical Models of Biochemical Oscillations
… the mathematics involved in modeling biochemical oscillations. We first discuss several important biochemical concepts fundamental to the construction of descriptive mathematical models. We review the basic theory of differential equations and stability analysis as it relates to two-variable …
-
Sub-Tidal Oscillations in Monterey Harbor.
… 1964-1966 showed that two types of sub-tidal oscillations occur in the harbor having mean periods in the range of 19 to 39 minutes and 1.5 to 2.0 minutes. Their heights, recorded on the tide records, varied from 0.2 to 0.4 foot and from 0.1 to 0.5 foot, respectively. The longer waves occur in …
-
EEG theta oscillations during sleep deprivation
Brain oscillations of different frequencies characterize the electroencephalogram (EEG) during distinct cognitive and vigilant states. Theta oscillations (4-8 Hz) are unusual because they have been found in the near-opposite conditions of sleepiness and alert cognitive control. Most neuroscience …
-
Nonlinear oscillations under multifrequency parametric excitation
A second-order system of differential equations containing a multifrequency parametric excitation and weak quadratic and cubic nonlinearities is investigated. The method of multiple scales is used to carry out a general analysis, and three resonance conditions are considered in detail. First, the …
Page 1 of 83