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 52 for “"Broad Area"”.
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Integrated Wavelength Stabilization Of Broad Area Semiconductor Lasers Using A Dual Grating Reflector
… DGRs were also integrated into an extremely broad area device of an unorthodox geometry; square devices that lase in two orthogonal directions were fabricated and tested. The last idea investigated was combining a DGR wavelength stabilized laser with a tapered semiconductor optical amplifier …
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Fabrication and performance of broad-area high power narrow linewidth semiconductor laser diodes
… the theoretical and experimental examination of broad-area, high-order, distributed feedback (DFB) grating, semiconductor laser diodes for the goal of manufacturably attaining longitudinal mode reduction. Through coupled-mode theory, the coupling coefficient, the reflectivity, and the laser …
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The Physical Origin of Pre-Breakdown Electron Emission From Broad-Area High Voltage Electrodes
… which cause pre-breakdown conduction between broad area electrodes separated by short ultra high vacuum gaps. A new automated specimen scanner and an electron imaging technique have shown that emission sites are composed of many distinct electron sources (sub-sites) which in total may extend …
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Fabrication and measurements of surface-etched grating distributed Bragg reflector laser
… the bandwidth of the laser gain is relatively broad, so a distributed Bragg reflector (DBR) laser is used to make a narrow linewidth laser. The thesis discusses semiconductor lasers that use surface-etched DBR along with the physics of both the semiconductor and the DBR laser. The topics …
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The Role of Context-Specific Information in The Management of Instruction in Continuing Professional Education: An Exploratory Study
The broad area of administrative strategies designed to enhance participants' satisfaction with their continuing education experiences was addressed. Of the four basic points of administrative intervention (participants, instructors, topic area, and context) this study focused on administrativ
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A Manual for Design Education at the College Level
… the philosophy and the principles of the broad area called design, as it is applicable to training of students in junior high and senior college with emphasis on teacher education.
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Simulation, Fabrication, and Characterization of Semiconductor Lasers
… thesis discusses three different types of laser: broad area, ridge waveguide and mode locking laser. Broad area laser (BAL) is the simplest to fabricate among these three lasers which is utilized for characterization of the material, whereas the ridge waveguide laser confines light within the …
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Discordant definitions of medical terminology and their impact on communication between English-speaking doctors and Xhosa-speaking parents at a paediatric hospital
[page 312 missing] This thesis falls into the broad area of applied linguistics, in the field of medical communication. The central problem which I investigate is the imperfect communication that takes place between largely English-speaking doctors and largely Xhosa-speaking parents. Some of the …
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A model for effective organisational stakeholder engagement : development and evaluation of a systematic approach to corporate-stakeholder engagement management
… academics and practitioners alike on the broad area of corporate social performance as a compelling element in the triple bottom line. Associated with this focus on corporate social performance, has been a burgeoning interest in stakeholder-related concepts of management, together with a …
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The Problem of Pendar : a lost abbey in medieval Senghenydd and the transformation of the church in South Wales
… Normans and around 1300. Investigation of this broad area of research identified a more focused area as the phenomenon of Pendar. Pendar is known to have had association with the Cistercian Order but its precise status within the order has never been fully understood. Indeed, its very location …
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Semiconductor quantum dot lasers.
… 175 milliamperes for a 60-$\mu$m by 400-$\mu$m broad area laser. A measured external quantum efficiency of $\sim$8.5% at low temperature with a peak power greater than 200 milliwatts demonstrate good size distribution and high gain in these high-quality QDs. At low temperatures, the lasing …
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Beliefs held in counselling psychology regarding secondary mental health care provision : reflections from 1998
… of the data collection in November 1998. The broad area of interest is the provision of psychological services by counselling psychologists to individuals who have enduring mental health problems. This research topic was chosen for its personal relevance to the researcher, who at the time was …
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High performance III-nitride light-emitting diodes for visible light communications and micro-displays
… In addition, compared with conventional broad-area LED devices, micro-LEDs show improved device performance in many aspects, such as high output power densities and the capability to withstand high injection current densities. For these reasons, micro-LEDs allow the study of interesting …
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Essays on the informativeness of earnings
… of three stand-alone but related essays in the broad area of earnings information and capital markets. The first paper examines the speed with which earnings information (as proxied by analysts’ earnings forecast updates) finds its way into the market place. Rather than examining the efficiency …
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The Influence of Socioeconomic Status and Subjective Social Status on the Career Development of College Students
… given their SES. Career development is a broad area of research; therefore, the current study examines a number of career development variables that are key in understanding college students’ career development, such as career adaptability, career decision-making difficulty, work values, …
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A study and development of Bayesian exemplar based models
… an Exemplar based model.In the thesis, the broad area of research is stated and the areas ofbackground work to be studied are identified and reviewed. An exemplar basedmodel based on family resemblance, clustering and Bayesian networks isdeveloped and implemented. An empirical evaluation of …
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On the Factorisation of Matrix Wiener–Hopf Kernels Arising From Acoustic Scattering Problems
The research undertaken in this thesis is in the broad area of diffraction theory. We consider three separate and distinct problems of acoustic scattering with rectangular geometries, which have a common underlying mathematical structure. The geometries are: the infinite wedge, the waveguide with a …
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Variational Autoencoders for Discovering Influential Latent Factors
… of data. Generative modeling falls under the broad area of representation learning, which aims to discover representations required for detecting features, classification, and other ways of understanding data. In this vein, variational autoencoders (VAEs) and their variants are one technique …
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Enhancing Corporate Strategy Using Data-Driven Business Growth Decisions
… and achieving company objectives – is a broad area involving many types of complex decisions. This thesis explores a data-driven approach to executing business growth decisions. Specifically, the thesis provides a machine-learning framework that can be used to predict outcomes of two …
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Numerical Comparison of Muzzle Blast Loaded Structure
… the effects of blast waves. However, a broad area of engineering problems, such as vehicle structures, buildings, bridges, or even the human body, can benefit by accurately predicting the response to blasts with little need for test or event data. This thesis reviews fundamental concepts …
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