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 19 of 19 for “"Lapping"”.
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Ultraviolet Bonding of Diamond Abrasive Tools for Lap-Grinding Process
Different from grinding, the lapping process is always taken place on higher precision machining process at low speed and low pressure. Conventional lapping process is based on a slurry process, abrasive particles mixed with lapping fluid supplied during the process and the abrasives keep rolling …
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Observing and measuring the drinking mechanism in cats
This study explores the characteristics of the lapping mechanism in domestic cats (Felis catus). Using high-speed video, digital image processing, and weight measurements we quantify data pertaining to the frequency of lapping and the volume of liquid consumed per lap. These observations allow us …
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Influences of surface quality on the rolling contact fatique behaviour of ceramics
A novel eccentric lapping machine was designed by the author and manufactured in-house, to serve as a test bench to investigate the finishing process parameters in relation to surface quality, as well as the feasibility of accelerating the finishing process of HIPed silicon nitride balls. The …
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Variation reduction of a closed-loop precision ceramic micromachining process
… of a TiC.A1203 ceramic using a closed-loop lapping process. Currently the micromachining process laps a ceramic bar with only a priori flatness adjustment. Bar flatness is adjusted prior to the lap using optical measurement of lithography targets. The average value of a critical dimension …
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A comparison of three seismic methods in the arid environment
… a delay time profile and a series of over-lapping refraction soundings were performed at the site of the optimum offset line. The delay time profile contains false structure that is an artifact of error accumulation in data reduction. The over-lapping refraction soundings produced a useful …
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Interfacial fluid dynamics inspired by natural systems
… have incomplete cheeks and cannot suck. When lapping, a dog's tongue pulls a liquid column from the bath, suggesting that the hydrodynamics of column formation are critical to understanding how dogs drink. We measured lapping in nineteen dogs and used the results to generate a physical model …
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A study and comparison of digital speech systems
… covariance method is used on several short over-lapping segments and a "cluster" decision scheme is used. This computationally expensive algorithm proves to yield better results than a straight forward application of the covariance method.
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Extrinsic uncertainty, ergodic chaos and monetary policy in two intertemporal economic models
… a single commodity two-period pure exchange over lapping generations model. Transversality techniques are utilised to show that extrinsically uncertain equilibria are locally generic in the space of endowments. An application of the methodology of the multijet transversality theorem demonstrates …
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Surfactant Adsorption during Collisions of Colloidal Particles: A Study with Atomic Force Microscopy (AFM)
… adsorbs and desorbs in response to over-lapping electric double-layers, with the adsorption being affected at larger solid-solid separations when the double-layer force is longer ranged. Furthermore, elimination off the surface charge or net surfactant charge eliminates adsorption with …
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Surface texture enhancement of SLS processed turbine blades using a mix of flexible media and abrasives
… the material removal rate of the current aero lapping technology due to the addition of the flexible media. Preliminary testing for this technology has shown that the developed system is within a 22% performance range of similar literature. However, the verification of these simulations and …
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A flexible interconnection for integrated circuits
… techniques, such as Silicon-On-Insulator, wafer lapping and Plasma Enhanced Chemical Vapor Deposition, are involved in this design to realize the interconnecting membrane. As a result, a sandwich-like membrane with silicon between silicon dioxide is obtained and proved flexible, which can be used …
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NDE1 in the DISC1 pathway: interactions of schizophrenia-related proteins
… complexes together and to have partially over-lapping expression patterns within the cell. That NDE1 and DISC1 directly interact is confirmed. The relationship between NDE1 and PDE4B is then investigated, with the two proteins found to complex within the cell. Additionally, it is shown that …
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Rolling contact fatigue of silicon nitride.
… was also carried out using an eccentric lapping machine to investigate the effect of eccentricity on the finishing rate of hot isostatically-pressed and sintered and reaction-bonded Silicon Nitride. The eccentricity had no significant impact on finishing rate as concluded in this study. …
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The Effect of Surface Processing Methods on the Laser Induced Damage Threshold of Fused Silica
… in sequence after the conventional grinding and lapping processes. These processing techniques are validated by several groups of LIDT tests.
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Development of A closed Loop Control System for Vibration Assisted Grinding
… induces an elliptic motion leading to a lapping process, which improves the cutting efficiency as well as the quality of the finished surface. Oscillation greatly reduces the load per grain, reduces wheel wear and induces a chip-breaking effect, which is a great advantage for prevention …
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Integration of ultrathin silicon chips
… of the wafer is thinned (using a sequence of lapping, chemical-mechanical polishing, and wet etching steps) until the front side trenches are reached, resulting in the separation of the chips. Prior to the DbyT process the silicon wafers were plated with gold tracks and solder bumps, …
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The effect of base stock and additive packages in an automotive oil on the friction and wear behaviour of overhead camshaft and finger follower systems
… either the additives in the oil or by a diamond lapping operation, the cams continued to run without scuffing in the mineral base oil under continuous, non stop test conditions. An intermittent, stop/start operating cycle however results in eventual scuffing due to additive film depletion and …
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Evolution of tectonic and stratigraphic geometries in the Southern Outeniqua Basin
… the top of the DMR in this sector, along with on-lapping reflector geometries of horizon B, Hauterivian (130Ma), is proposed to signify that the continental block existed prior to the formation of the Southern Outeniqua Basin and remained a basement promontory until the development of horizon G - …
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INNOVATION AND OPTIMIZATION OF THE HYDROGEN TRANSPORT AND DISTRIBUTION CHAIN AS A GREEN AND RENEWABLE ENERGY VECTOR
… of hydrogen and methane-hydrogen mixtures. The lapping odorization system was successfully simulated and the results demonstrated a variation in the secondary flow required, depending on the pure gas considered, namely hydrogen or methane, their ratio in the mixtures and the odorant taken into …