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Articles 541 - 545 of 545
Full-Text Articles in Physics
A Theoretical Model For Biased Superlattice Devices, Michael Ferner
A Theoretical Model For Biased Superlattice Devices, Michael Ferner
Theses
A model describing the subband structures and tunneling characteristics of superlattices is presented. The model solves the envelope function equations by the transfer matrix technique. The results are codified in a Fortran program, and the model is applied to several structures.
Superlattice have been studied extensively, however many new structures await investigation.
This model is presented as a preliminary design tool. The program allows a designer to do preliminary calculations. This type of investigation guides a designer toward a goal by making possible a large number of calculations on many different structures.
A Theoretical Study Of The Subband Structures And Tunneling In Polytype Heterostructures, Hong Chen
A Theoretical Study Of The Subband Structures And Tunneling In Polytype Heterostructures, Hong Chen
Theses
A theoretical study of the electronic and optical properties in polytype heterostructures is presented in this thesis.
In the first part of the thesis (Chap. 2 and Chap. 3), an explicit expression for calculating the subband structure and tunneling is formulated by the incorporation of the envelope function approximations and the transfer matrix technique. It is based on the k*p theory as done to date, but contains two significant improvements: a more realistic treatment of the spatial and energetic dependance of effective masses and band edges; the availability of the calculations, in favor of direct numerical evaluation, to various quantum …
Instrumentation For The Characterization Of 10 Micron Focal Plane Array Detectors, Zhen Zong
Instrumentation For The Characterization Of 10 Micron Focal Plane Array Detectors, Zhen Zong
Theses
In the atmospheric window thermal imaging technology, the 8-12 micron spectral range is of particular interest, since the 300 K black body radiation peaks at around 10 micron with a flux as large as 1019photons/cm2sec. Due to its extreme temperature sensitivity for the 300 K background imaging, this long wave length infrared atmospheric window is vital for a variety of applications. A monolithic GaAs multiple quantum well (MQW) IR image sensor in this spectrum region is being developed in the research group of Profs. K. Chin and J. C. Hensel.
The work performed here is to set up a computer-controlled …
Quantitative Measurement Of Pyrolysis And Combustion Species Concentration By Molecular-Beam-Sampling-Mass-Spectrometry, Xian Zhong
Theses
A molecular-beam-sampling apparatus utilizing both a time-of-flight mass spectrometer with vacuum ultraviolet (VUV) photoionization and a quadrupole mass spectrometer with electron impact ionization is described. These systems are used to analyze reactants and products, as well as reactive intermediates, from flow tube experiments at reduced pressures and elevated temperatures. It is shown that the quadrupole signal sensitivity can be predicted using literature cross sections which are based upon the atom hybridization within the various molecules. Measurements of the VUV photoionization sensitivity for stable species led to development of a group additivity approach to predict cross sections. This approach was extended …
The Invention Of The Transistor, Bret E. Crawford
The Invention Of The Transistor, Bret E. Crawford
Graduate College Dissertations and Theses
Julius E. Lilienfeld filed for patents for three different designs for solid-state amplifying devices between 1926 and 1928, well before Bell Lab's discovery of the point-contact transistor in 1948. The American Physical Society named a prize in honor of Lilienfeld after receiving a substantial sum of money in 1982 from the will of his wife, Beatrice Lilienfeld, who believed her husband had not received sufficient credit for his scientific contributions. In order to investigate Lilienfeld's contribution to early efforts to replace the vacuum triode, we present the history surrounding these efforts, contributions and limitations of Lilienfeld's work, and details of …