Atoms in microcavities : detection and spectroscopy

This thesis presents work undertaken with cold rubidium atoms interacting with an optical microcavity. The optical microcavity used is unique in its design, being formed between an optical fibre and silicon micromirror. This allows direct optical access to the cavity mode, whilst the use of microfabrication techniques in the design means that elements of the system are inherently scalable. In addition, the parameters of the system are such that a single atom has a substantial impact on the cavity field. In this system, two types of signal arise from the atoms' interaction with the cavity field; a `reflection' signal and a `fluorescence' signal. A theoretical description for these signals is presented, followed by experiments which characterise the signals under a variety of experimental conditions. The thesis then explores two areas: the use of the microcavity signals for atom detection and the investigation of how higher atom numbers and, as a result, a larger cooperative interaction between the atoms and the cavity field, impacts the signals. First, the use of these signals to detect an effective single atom and individual atoms whilst falling and trapped is explored. The effectiveness of detection is parameterised in terms of detection confidence and signal to noise ratio, detection fidelity and dynamic range. In the second part of this thesis, the effect of higher atom numbers on the reflection and fluorescence signals is investigated. A method for increasing the atom number is presented, alongside experiments investigating the impact on the measured signals. This is followed by experiments which explore the dispersive nature of the atom-cavity interaction by measuring the excitation spectrum of the system in reflection and fluorescence. In doing so, it is shown that, for weak coupling, these two signals are manifestly different

Solving the Structure of eIF2 Bound to eIF2B Using Cryogenic Electron Microscopy

Translation begins when initiation factor-2 (eIF2) delivers methionyl initiator tRNA (Met-tRNAi) to the ribosome. The exchange of GDP bound to eIF2 for GTP is a prerequisite to binding Met-tRNAi and is mediated by a second initiation factor, eIF2B. Regulation of mRNA translation is achieved through phosphorylation of eIF2 α at Ser51 which converts eIF2 from a substrate into a competitive inhibitor of eIF2B. Using the latest cryo-electron microscopy (cryoEM) technologies in both collection and data processing we were able to obtain three high resolution structures to interrogate the structural basis of the integrated stress response

Interim report on surface water resources and quality of waters in Lee County, Florida

Report seeks to address following questions: 1. Where within Lee County are surface supplies of water located? 2. What are the variations in this supply? 3. What can be done to provide better answers to questions 1 and 2 than are available at the present time? (PDF contains 76 pages.

A statistical study of the surface accuracy of a planar truss beam

Surface error statistics for single-layer and double-layer planar truss beams with random member-length errors were calculated using a Monte-Carlo technique in conjunction with finite-element analysis. Surface error was calculated in terms of the normal distance from a regression line to the surface nodes of the distorted beam. Results for both single-layer and double-layer beams indicate that a minimum root-mean-square surface error can be achieved by optimizing the depth-to-length ratio of a truss beam. The statically indeterminate double-layer beams can provide greater surface accuracy, though at the expense of significantly greater complexity

The Function of Uniform State Laws

Author is incorrectly identified as Summer Kenner on title page

Review of \u3ci\u3e The Texas Military Experience: From the Texas Revolution through World War II\u3c/i\u3e Edited by Joseph Dawson III

The Texas Military Experience is primarily a compilation of papers read at a symposium sponsored by the Military Studies Institute at Texas A & M. The quality and scope of the essays, needless to say, vary greatly. Several, such as Paul Hutton\u27s The Alamo as Icon, Thomas W. Cutrer\u27s piece on Ben McCullough, and especially Joseph c. Porter\u27s meticulously researched study of Captain John G. Bourke\u27s tour of duty on the Rio Grande, are especially well written and thought provoking. Hutton\u27s sardonic but gentle dissection of the defenders of Alamo mythology alone would make the book worthwhile for most Texas expatriates. Some of the offerings are disappointingly broad in scope. The essays by William H. Leckie and the late Sandra L. Myres on the buffalo soldiers and officers\u27 wives respectively are well done, to be sure, but may seem somewhat redundant to the many readers already familiar with their work. World War II essays by Roger J. Spiller on Audie Murphy and Martin Blumenson on the 36th Infantry Division are both interesting and informative, though one wishes that Blumenson\u27s work especially had reflected more adequately the amount of research he has obviously done on the 36th Division. The most disappointing entry, unfortunately, concerns the topic with the greatest potential interest. In an article uniquely entitled Texas in the Southern War for Independence, Ralph A. Wooster uses a shotgun approach that sacrifices depth for comprehensiveness. The result is a pedestrian overview resembling what one would expect to find in any standard Texas History survey. An introduction by Joseph Dawson and an epilogue by Roger Beaumont tie the discordant themes of the anthology together in as professional and logical a manner as possible. A reader might do well to read both before turning to the essays themselves. Despite the inevitable variations in quality, The Texas Military Experience seems above average when compared with most compilations of symposium papers