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 113 for “"clamping"”.
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Timing of cord clamping (TOCC): An observational study of cord clamping practice in a New Zealand maternity hospital
… The routine intervention of immediate cord clamping was introduced as part of active management of the third stage of labour over half a century ago. It has become a growing cause for concern due to the potential harm of preventing the newborn access to its placental blood and subsequent …
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Clamping-simplex methods : improved direct search simplex algorithms
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Design of clamping mechanism for securing sections of unmanned submarine
A clamping mechanism was designed for securing together two sections of a 12.75" diameter autonomous underwater vehicle. Two semicylindrical sections are secured together by sixteen 1/4"-20 bolts around the machined ends of the vehicle sections. An angled interface between the clamps and the …
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Improvement of the Operating Efficiency and Initial Costs of a Utility-Scale Photovoltaic Array through Voltage Clamping
The utility-scale PV array systems must be designed to operate normally at maximum power point VMPP, but must also withstand the very high voltage level of open-circuit voltage VOC which seldom occur in reality operation, if they are shut down or otherwise power grid unable to receive the full …
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The Effect of Tool Rotation Speed and Clamping on Deformation in Friction Stir Welded 6061-T6511 Aluminum Extrusions
… tool rotation speed, clamp spacing, and clamping force were altered to ascertain their effects on distortion in the welded panels. Mechanical forces were monitored during the weld process. Both linear and out of plane distortion were measured on the welded extrusions. The Vickers hardness …
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Exploration of versatile clamping mechanism and brace system for table attachment to lamp posts and poles in urban settings
… the table's functionality. These goals included clamping to signs and poles of various diameters, safely supporting large loads and a simple, quick deployment process. Initial prototypes failed in fulfilling all three goals, largely due to inappropriate clamping mechanisms. In choosing a ratchet …
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Control And Topology Improvements In Half-bridge Dc-dc Converters
… Focusing on the efficiency issue, a variety of clamping techniques including both active and passive methods are presented after the ringing issues in DC-DC converters are investigated. By presenting the clamping techniques, a big variety of energy management concepts are introduced. The active …
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Coordinated locomotion between robots separated by a surface
… magnets (EPMs) [5] to establish a continuum of clamping force between the robots, enabling the motion of one robot to slave the other during a variety of maneuvers. The author designs a novel, solid-state EPM arrangement capable of generating up to an estimated 890N of clamping force under …
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Planning for manipulation of interlinked deformable linear objects with applications to aircraft assembly
… DLOs to a support structure using a set of clamping points. The formulation describes the manipulation planning problem in terms of known clamping locations; pre-determined ideal clamping locations on the cables, called "reference points", and a set of finite gripping points on the DLOs. We …
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An experimental/analytical investigation of combined shear/end loaded compression strength testing of unidirectional composites
… accomplished by applying a controlled amount of clamping force to the stabilizing blocks, allowing them to transmit shear force to the coupon faces through friction. The fabrication of test specimens from a BASF graphite IBMI material system is described in detail, including the application of a …
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Growth and magnetoelastic behavior of b-axis-oriented dysprosium
… which constrain the strictions which may occur (clamping). The present research describes a new MBE growth procedure to grow single crystal thin films and superlattices of rare earths with the hcp (llOO) b-axis normal to the growth plane. To explore the role of strain, clamping and …
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Carton Clamp Methodologies and the Effects on Load Containment and Retention
… of force being applied to the load. The required clamping force changes depending on the size, shape, and weight of the load. This creates the potential for under-clamping (slippage) and over-clamping (compressive damage). Seeing a market need for a reliable means of testing, two organizations set …
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Inchworm car seat drive : designing a linear actuator that mimics inchworm motion
… of two modules, an actuation module and a clamping module. The actuation module is a simple motor-wobble plate assembly and the clamping module consists of spring-loaded jamming plates. The final prototype succeeded in inching the shaft forward in one direction, but failed at shifting …
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Deuterium Phase Behavior in Thin Film Pd
… with the films expanding under an in-plane clamping constraint imposed by the substrate. The effect of this substrate constraining force is to amplify the out-of-plane expansion beyond that expected in bulk Pd. Taken together, these measurements implicate the film/substrate interfacial …
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Metody anti-windup při řízení lineárních dynamických systémů
… jeho potlačení. Představenými metodami jsou clamping, back-calculation, řízení s vnitřním modelem soustavy a návrh pomocí LMI. Pro poslední dvě zmíněné metody byla vytvořena aplikace pro Matlab. Tyto metody byly následně otestovány na vybraných soustavách pomocí simulace Matlab Simulink. …
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Insulation-Constrained Design of Power Electronics Converters and DC Circuit Breakers
… design approach. Traditional MOV based voltage clamping circuits (VCC) used in solid-state circuit breakers (SSCBs) impose a high interruption voltage on the main solid-state device. The voltage burden arises from the material properties of the MOV which fixes its clamping voltage at a value …
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Wafer bonding : mechanics-based models and experiments
… that connect the wafer geometry, etch pattern, clamping configuration, and work of adhesion to bonding failure. An energy-based bonding criterion, which allows the effect of flatness variations and etch patterns to be quantified, is presented and employed to develop analytical and numerical …
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Linear-time invariant Positive Systems: Stabilization and the Servomechanism Problem
… constant disturbances via switching tuning clamping regulators (TcR), linear quadratic clamping regulators (LTQcR), and ending with MPC control. Finally, all theoretical results on the positive servomechanism problem are justified via numerous experimental results on a waterworks system.
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Characterization of new particulate MMC materials and bolted joints through applicable ASTM standards
… and implemented. Various parameters like clamping force, e/d ratio and w/d ratios are varied in order to investigate the effect on mode of failure and ultimate failure load of the MMC. It has been found that the major mode of failure in PRMMC is due to net-section failure on account of its …
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