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Articles 1 - 6 of 6
Full-Text Articles in Physics
Correction Of Chromatic Aberration With An Electron Mirror, Michael Stewart Mauck
Correction Of Chromatic Aberration With An Electron Mirror, Michael Stewart Mauck
Dissertations and Theses
The theoretical basis for using electron mirrors as correctors of chromatic aberration is presented and an experimental verification of correction of chromatic aberration is demonstrated. A hyperbolic electrostatic electron mirror operating in its converging range and at unity magnification was used as a corrector. A novel separating system with deflections taking place at image planes was developed to implement the mirror without impairing the resolution. Correction was demonstrated in an electron optical probe system. The chromatic aberration was measured by means of the shadows cast by a fine mesh placed near the final image. The experimental method and equipment are …
Binary Mixtures Near Surfaces, Patrick Dunn
Binary Mixtures Near Surfaces, Patrick Dunn
Dissertations and Theses
This paper presents an approach to modeling a binary mixture near a surf ace. The approach used is based on statistical mechanics. The Cluster Variation (CV) method is used to solve an Ising-like model with a cluster size of two (neighboring lattice points). The free energy of the system is expressed in terms of the probabilities of occurrences of particular clusters. The CV method is first developed for a homogeneous system which leads to a set of three non-linear partial differential equations. The surface boundary is then introduced and the CV method is developed for this system which leads to …
Flux Trapping In Superconducting Pellets, Andreas Straub
Flux Trapping In Superconducting Pellets, Andreas Straub
Dissertations and Theses
This research concerns the effects on samples of nominal composition Bil.8Pb0.2Sr2Ca2cu30y which were exposed to hot, dense argon in a ballistic compressor. The investigations were concentrated on two specimens which were exposed to hot, dense argon at about 1800 K (peak pressure 330 atm) and 1500 K (peak pressure 230 atm), respectively. Sample Bi #1 showed a completely melted surface structure after triple exposure in the ballistic compressor at 1800 K while the surface of sample Bi #7 was just partly melted after double exposure at 1500 K. Changes in flux trapping capability and qualitative Meissner effect were investigated in …
Adsorption Of Halogenated Phenolate Ions To Egg-Phosphatidylcholine Vesicles, Andreas Blochel
Adsorption Of Halogenated Phenolate Ions To Egg-Phosphatidylcholine Vesicles, Andreas Blochel
Dissertations and Theses
In this study, parameters for the adsorption of several halogenated phenolate ions to egg-phosphatidylcholine vesicles have been determined by microelectrophoresis.
Proteolytic Modification Of The Ca²-Release Mechanism Of Sarcoplasmic Reticulum In Skeletal Muscle, Ute Goerke
Proteolytic Modification Of The Ca²-Release Mechanism Of Sarcoplasmic Reticulum In Skeletal Muscle, Ute Goerke
Dissertations and Theses
Calcium ions are important mediators in the mechanism of contraction and relaxation of muscle fibers. Depolarization of sarcolemma and transverse tubule causes an increase of myoplasmic ca2+ concentration which induces contraction of the myofibrils. In skeletal muscle fibers, the intracellular Ca2+ concentraton is regulated by an extensive membrane system, the sarcoplasmic reticulum (SR). Ca2+-release from SR is initiated by depolarization of the transverse tubule via a process referred to as excitation-contraction coupling. The Ca2+ - release channel located in the junctional SR plays an important role in this mechanism.
Nonlinear Dynamics In Oscillating Waterfalls, Michael Schumann
Nonlinear Dynamics In Oscillating Waterfalls, Michael Schumann
Dissertations and Theses
The concern of this thesis was to investigate the nonlinear dynamics inherent in oscillating waterfalls.