Image Theses and Dissertations An experimental investigation of the crack tip stress intensity factors in plates under cylinfrical bending The stress intensity factors have been shown to control the rate of propagation of a crack when material is subjected to cyclic loading. This experimental study was undertaken to verify the existence of a critical stress intensity factor in bending which controls crack extension. View Item
Image Theses and Dissertations Transient thermal stresses in finite hollow cylinder The aim of this thesis is to present a solution of the problem of thermal stresses in a finite hollow cylinder due to a sudden change in temperature on the inner boundaries. View Item
Image Theses and Dissertations A critical study of the stress singularities of an elastic polygon under longitudinal shear The order of the stress singularity at its vertex of a wedge of two bonded elastic media under longitudinal shear is solved by use of the Williams method. The similar problem of an elastic wedge bonded to a rigid foundation is also solved using the same method. Next, the problem of a cylindrical elastic media whose boundary is a polygon bonded to a rigid foundation and subjected to various types of longitudinal shear loads on its boundary is considered. A number of examples are worked out and expressions for contact stresses along the bonds are given. View Item
Image Theses and Dissertations Crack propagation in thin plates under cyclic bending A testing machine has been built for the cyclic bending of thin cantilevered plates for crack propagation studies. The report includes sections covering design considerations of the testing machine, preparation of specimens, observations during testing, and some preliminary test results. View Item
Image Theses and Dissertations A temperature-dependent model for an AlInAs/GaInAs heterojunction bipolar transistor View Item
Image Theses and Dissertations An electrochemical capacitance-voltage technique for the determination of pseudomorphic high electron mobility transistor material parameters View Item
Image Theses and Dissertations Thermal stresses in a finite hollow cylinder The problem considered is that of determining the 2-dimensional thermal stresses in a thick-walled finite hollow circular cylinder subjected to an axisymmetric temperature distribution. View Item
Image Theses and Dissertations Quantitative scanning microwave microscopy of a biological cell The electromagnetic properties of a live biological system are extremely important to many medical applications. While information about electromagnetic properties of tissues are available in the literature, little or no data are available for a single cell or subcellular structures. Microwave biological/cell detection has been demonstrated to be useful and promising in many medical applications due to its internal properties such as non-invasive, fast and label-free. View Item
Image Theses and Dissertations The anti-plane shear problem for a crack near an elastic inclusion The problem of an infinite medium containing a crack near an arbitrarily located circular elastic inclusion and subjected to a uniform longitudinal shear stress at infinity is considered. By embedding a layer of body forces at the interface, the problem for the nonhomogeneous medium is reduced to two problems for homogeneous materials. View Item
Image Theses and Dissertations The axisymmetric crack problem in a semi-infinite nonhomogeneous medium View Item
Image Theses and Dissertations Effects of injection current density and active layer doping and thickness on the spectral emission properties of high-speed 1.3 um InGaAsP surface emitting light emitting diodes View Item
Image Theses and Dissertations The effect of N layer doping level on the forward voltage of AlGaAs double-heterostructure light emitting diodes View Item
Image Theses and Dissertations Dielectric Spectroscopy of Biological Samples For the first time, the impedance spectrum of live Jurkat T-lymphocytes human cells was characterized in a single sweep spanning six decades of frequency from 9 kHz to 9 GHz. The ultrawide bandwidth bridged the traditional impedance spectroscopy at kilohertz to megahertz frequencies with the recently developed microwave dielectric spectroscopy, which can probe the cell interior without being hindered by the cell membrane. View Item
Image Theses and Dissertations Development of a 1[mu]m GaAs metal-semiconductor field effect transistor fabrication process View Item
Image Theses and Dissertations CMOS Closed-loop Control of MEMS Varactors A closed-loop capacitance sensing and control mix-mode circuit with a dedicated sensor electrode and a proportional-integral controller was designed for MEMS varactors. The control was based on tuning the bias magnitude of the MEMS varactor according to t View Item
Image Theses and Dissertations Thermal conductance of two stacked composite circular cylinders with mixed boundary conditions During the design of a semiconductor device, it is desirable to know the thermal resistance of the device encapsulation before construction. View Item
Image Theses and Dissertations Fracture mechanics analysis of some fatigue and fracture test specimens using finite elements / View Item
Image Theses and Dissertations An analysis of thin toroidal shells of elliptical profile subjected to uniform pressure In this thesis the problem of a toroidal shell of elliptical profile is considered from the point of view of the small deflection theory of thin shells of revolution leaded symmetrically with respect to their axis. Solutions of such problems are found by applying methods of asymptotic integration of a differential equation involving a large parameter multiplied by a function which vanishes at certain point. View Item
Image Theses and Dissertations Wafer-scale Fabrication and Characterization of Recessed-channel PtSe2 MOSFETs with Low Contact Resistance and Improved Gate Control For the first time, wafer-scale fabrication of PtSe2 MOSFETs was demonstrated by photolithography. The on PtSe2 is grown by thermally assisted conversion (TAC) of Pt films under Se vapor at 400 °C. Taking advantage of the unique property of PtSe2 to transition from semiconductor to semimetal as its thickness increases beyond a few monolayers, channel recess was adapted for improving gate control while keeping the contact resistance as low as 0.008 Ω∙cm. The wafer-scale fabrication resulted in uniform device characteristics so that average vs. best results were reported, as well as RF vs. View Item
Image Theses and Dissertations Stress intensity factors in an orthotropic plate containing surface cracks / View Item
Image Theses and Dissertations Transient temperatures and thermal stresses in composite cylinders due to heatgeneration Study of the temperatures and stresses in two concentric, homogenous, isotropic, infinite cylinders, with heat generation in the innercylinder, under the following conditions: the cylinders and the surroundings are initially at the same temperature, the temperature of the surroundings remains constant when the temperature of the cylinders increases, no body or surface forces, no other heatsource are considered, the tow cylinders are able to expand freely in the radial and longitudinal directions. View Item