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.
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Showing 1 to 20 of 233 for “"Lever"”.
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Quantum dot gain-lever laser diode
… the overall modulation bandwidth. The gain lever effect is a method used to enhance the efficiency of amplitude modulation and optical frequency modulation at microwave frequencies by taking advantage of the sub-linear nature of the gain versus carrier density. Previously, two-section …
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Resurgence of lever pressing during a DRO challenge
… reinforced response. During Phase 1, rats’ left lever pressing was reinforced on a fixed-ratio (FR) 20 schedule while extinction was in place for right lever presses. Then, extinction was in effect for all lever presses throughout Phase 2. Phase 3 consisted of an FR 20 schedule for right lever …
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The design of a hand-powered lever-driven tricycle for the handicapped
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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The design of a frame for an all terrain, lever propelled wheelchair
… the process of designing a frame for the Leveraged Freedom Chair (LFC) Prime, an all-terrain levered powered wheelchair designed to improve the mobility of disabled individuals. This design allows for a system of two hand lever propulsion, turning, and braking that uses different hand …
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Exploring the Dynamics of a Mechanical Watch Lever Escapement using Finite Element Analysis
… element-based simulation of a mechanical watch lever escapement. This was accomplished in four steps: by choosing a reference escapement based on the needs of the study, by executing a reverse engineering methodology to create a lever escapement in computer-aided design (CAD) software, by …
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Mid-Level Leadership as a Lever for Human Flourishing in a Canadian Educational Institution
Despite decades of leadership evolution, problems related to human flourishing have not been adequately addressed by traditional approaches. Neoliberal and hierarchical frameworks have led to policies and practices that substantially transformed organizations, while at the same time limiting …
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Design Transfer as a Lever for Accelerated Medical Device Innovation: A Case-Based Mapping Approach
… yet under- examined phase of NPD, as a strategic lever to reduce time-to-market. The project uses swimlane flowcharts and Design Structure Matrices (DSM) to map real-world processes, identify breakpoints, and classify rework (both planned and unplanned) in four case studies from Stryker …
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Pre-Apprenticeship as a Lever for Workforce Equity: A Quantitative Study of Non-Traditional Adult Learners in California
<p>A pre-apprenticeship is a short-term, structured training program that prepares individuals with the skills, experience, and support needed to enter and succeed in a registered apprenticeship. Nationally, and in California, pre-apprenticeship programs are posited as a key equity strategy to …
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Strengthening district management as a key lever in health system strengthening: bottom up innovation in two district health systems in South Africa
It is widely recognised that the District Health System (DHS) is an effective vehicle for institutionalising Primary Health Care (PHC) - and establishing an effective DHS to improve access to health services has been an explicit South African government goal since 2003. Whilst there has been …
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The Matching Law and Schedule: Induced Drinking
… drinking. Procedure. Rats were taught to press a lever for food. Food was made available by a concurrent variable-interval variable-interval reinforcement schedule. One schedule alternative provided one pellet of food every 90 seconds on the average. The other alternative was varied over a range …
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Self-control as Response Produced Time-out from a Stimulus Associated with Reinforcement and Response Independent Shock
… rats were trained in operant chambers to press a lever (lever A) for VI 30" food during one stimulus (S1) and never reinforced during another stimulus (S2). When responding stabilized a second lever (lever B) was introduced. The function of a response on lever B was to terminate S1 and produce S2 …
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The Effects of Nucleus Accumbens Opiate and Adenosine Receptor Activity on Appetitive Operant Learning
… days of acquisition of an appetitive operant lever-pressing response. Subjects subsequently trained on the operant learning paradigm until lever pressing patterns stabilized and then received another drug injection to test the effects of the drugs on general operant performance. Both …
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Effects of Ventromedial Hypothalamic Lesions on Food-Reinforced Fixed Ratio Responding
… of propensity to eat such as food-rewarded lever pressing. The current experiments attempt to discover the conditions under which these opposite effects on "food-motivated" behavior occur. Rats with ventromedial lesions made with steel electrodes showed a decrease relative to controls in …
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Air piston approach to wave power generation
… which in turn raises or lowers one side of a lever arm about a stationary pivot point. This, thereby, raises or lowers a piston, which is attached to the opposite side of the lever through a cylinder, which causes large volumes of air to move. This air is funneled through drive turbines, which …
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Techniques for high-speed direct modulation of quantum dot lasers
… region in single-section QD lasers, the gain-lever effect in two-section lasers and the injection-locking technique. Firstly, the modulation performances of p-doped InAs/GaAs QD lasers were studied. Contrary to the theoretical predictions, the modulation efficiency and the highest relaxation …
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Factors which can affect the preferences of the elderly for hand pruners
… combinations: hook and blade with simple lever, anvil and blade with simple lever, hook and blade with compound lever, and anvil and blade with ratchet mechanism. Other characteristics included handle design and weight. The Friedman ranking test was used to determine the factors which …
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Discriminative Stimulus Effects of Gabapentin
… 30.0 mg/kg gabapentin from vehicle in a two-lever drug discrimination task. All of the ten rats tested were able to establish gabapentin as an interoceptive cue. Gabapentin produced full generalization (≥ 80% gabapentin-lever responding) for itself at 30.0, 60.0, and 120.0 mg/kg doses. …
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Optical system for high-speed Atomic Force Microscope
… the design and development of an optical cantilever deflection sensor for a high speed Atomic Force Microscope (AFM). This optical sensing system is able to track a small cantilever while the X-Y scanner moves in the X-Y plane at 1KHz over a large range of 50x50 microns. To achieve these …
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