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 15 of 15 for “"Parallel Mechanisms"”.
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A hybrid type small 5-axis CNC milling machine
… capacity. Most of these machines have serial mechanisms so that low static and dynamic stiffness become very critical design issues especially for high speed machining. Parallel mechanisms have recently received attention from machine tool designers because of their inherent potential for …
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High -Throughput Coherence Controllers
Applying a combination of the parallel mechanisms allows integrating four times as many processors per coherence controller. This reduces system cost, while maintaining or even exceeding the performance of systems with a larger number of coherence controllers.
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Constraint Analysis and Theoretical Development of Multi-Furcation and Reconfiguration in Mechanisms
Multi-furcation and reconfiguration in mechanisms interested many researchers over past twenty years since the early investigation by Wohlhart in 1996. This Dissertation systematically investigates multi-furcation and reconfiguration in mechanisms including recognition of motion branches, factors …
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Mothering Out of Bounds: Inequality and Resistance in Fat Motherhood
… and inequality in motherhood. It highlights parallel mechanisms of surveillance (for example, between fat and poor mothers) to show how society constructs who "should" and "should not" be parents. Based on a series of 36 in-depth interviews with 18 mothers conducted in the first half of 2022, …
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Design and optimization of a macro-micro manipulator featuring a 3-UPS compliant parallel mechanism
… manipulator system composed of two different parallel mechanisms which are responsible for the macro motion and the micro manipulation respectively. The macromanipulator is a 3-RRR planar parallel mechanism which has the mobility of 3 DOFs, namely two translational DOFs along x- and y-axis and …
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Design of heterogeneous bifunctional catalyst for upgrading bioethanol through the Guerbet reaction
… The reaction was found to proceed through two parallel mechanisms on basic magnesia where acetaldehyde, formed from ethanol dehydrogenation, can either couple with itself or with adsorbed ethoxide to form new carbon-carbon bonds and the ethanol to acetaldehyde pressure ratio was found to …
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Methods for Kinematic Analysis and Optimization of Overactuated Serial and Parallel Structures
… analysis, and control of mixed serial-parallel structures known as SP-Stacks. A SP-Stack is a series of Stewart Platforms (SPs) linked via their top and bottom plates to create a serial chain of parallel mechanisms. SP-Stacks are unique in their bridging of the benefits of parallel …
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Kinematics Analysis of Two Parallel Locomotion Mechanisms
… presents the kinematics study on two cases of parallel locomotion mechanisms. A parallel locomotion mechanism can be defined as "a mechanism with parallel configuration and discrete contact with respect to the ground which renders a platform the ability to move". The first case is a tripedal …
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Performance improvement for robotic mechanisms by: synthesis design, dynamic balancing and adaptive control techniques
… Improving the performance of robotic mechanisms is a main research area. In this thesis, performance improvement is achieved through the approaches of robotic mechanism synthesis design, dynamic balance, and adaptive control. A novel three degrees of freedom hybrid manipulator is …
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DESIGN AND CONTROL OF A ROBOTIC SYSTEM TO ASSIST WITH MRI-GUIDED INTERVENTIONS
… are targeted to be enhanced using automated mechanisms. Magnetic Resonance Imaging MRI-guided intracardiac intervention under beating-heart conditions is one of such sophisticated operations, which has attracted lots of attention recently. This dissertation focuses on the design, fabrication …
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Adherens Junctions and The Actomyosin Network Regulate Organ Growth By Modulating Hippo Pathway Activity In Drosophila
… basolateral components act through the same or parallel mechanisms to regulate Yorkie activity.</p> <p>Here, we dissect how loss of AJ and basolateral components affects Hippo signaling in <em>Drosophila</em>. Surprisingly, while <em>scrib</em> knock-down tissue displays increased reporter …
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Preclinical Optimization of Treatment with Inhaled Argon to Improve Neurological Outcome and Survival After Cardiac Arrest
… thesis is to determine the efficacy, safety and mechanisms of action of Argon in different experimental models. <br></br><br></br> <b>Methods.</b> In order to assess the efficacy of argon treatment on post CA syndrome, a pig model of CA with underlying acute myocardial infarction and …
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Interaction effects on product development networks in China
… network and the guanxi network approaches as parallel mechanisms or cross-cutting patterns of explaining evolution of business relationships. This research highlights how an Industrial Marketing and Purchasing (IMP) approach can be useful to interpret interaction processes in China and argues …
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Discrete Approximations, Relaxations, and Applications in Quadratically Constrained Quadratic Programming
… chained Stewart platforms (SPs). These SPs are parallel mechanisms that are stiffer, and more precise, on average, than their serial counterparts at the cost of a smaller range of motion. The robot will be used in concert with several other types robots to perform complex assembly missions in …
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INVESTIGATION OF THE CARDIOPROTECTIVE AND HYPOTRIGLYCERIDEMIC POTENTIAL OF ECHIUM OIL AS A BOTANICAL SOURCE OF LONG CHAIN N-3 FATTY ACIDS
… EO on the development of atherosclerosis and the mechanisms mediating its hypotriglyceridemic effects using male apolipoprotein B100-only low density lipoprotein receptor knockout (apoB100-only LDLrKO) mice, a mildly hypertriglyceridemic model of atherosclerosis with significant plasma TG …