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 30 for “"variation analysis"”.
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Variation Analysis of Involute Spline Tooth Contact
… tooth engagement in splined couplings based on variations in clearances between mating teeth. It is standard practice to assume that 25-50% of the total spline teeth in a coupling are engaged due to variations from manufacture. Based on the assumed number of teeth engaged, the load capability of …
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Variation analysis of cold rolled steel manufacturing
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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System level variation analysis of product development
Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2002.
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System variation analysis of MIG welded aluminum structural frames
Variation reduction techniques are developed which explore an entire system for improved quality, rather than a single manufacturing operation. This system-level modeling approach is explored with an example of a complex assembly of aluminum extrusions and castings welded into a structural frame. …
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Adjoint Methods and Inverse Modeling for Process Variation Analysis in Silicon Photonics
… of integrated photonics, manufacturing process variation studies are required to launch the many photonic applications to mass production and commercial use. Specifically, we need models that predict the impact of process variations on photonic circuits, and extraction of process variation …
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Manufacturability of lab-on-chip devices : dimensional variation analysis of electrode foils using visual technology
… measurements. This work involved a thorough variation analysis of the electrode dimensions to characterize the repeatability of the new manufacturing process developed by Daktari. For this purpose optical imaging was used to obtain high-resolution images of the electrodes and an algorithm was …
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Lean manufacturing in a semiconductor environment : use of variation analysis to focus continuous improvement efforts
… to address various forms of throughput variation, Autonomous Manufacturing (AM), Planned Maintenance (PM), and Waste Elimination (WE). Autonomous Manufacturing focuses on refurbishing manufacturing tools to new or better condition, up-skilling manufacturing technicians, and …
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Manufacturing of Lab-On-a-Chip devices : variation analysis of liquid delivery using blister packs
… This work involved performing a thorough variation analysis of the blister pack to determine the critical sources of variation. For this purpose, the tool of variation simulation modeling (VSM) was used. A numerical model of the blister performance was developed and Monte Carlo simulations …
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DNA Sequence and Haplotype Variation Analysis of Inflammatory Response Genes NLRX1, IL6, and IL8 in the Turkey (Meleagris gallopavo)
… to accomplish this goal is the need to identify variation at the genomic level. To test the hypothesis that DNA sequence variations in inflammatory response genes are associated with phenotypic differences in the heritage turkey, the primary objective of this project was to search for single …
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Variation Simulation of Fixtured Assembly Processes for Compliant Structures Using Piecewise-Linear Analysis
While variation analysis methods for compliant assemblies are not new, little has been done to include the effects of multi-step, fixtured assembly processes. This thesis introduces a new method to statistically analyze compliant part assembly processes using fixtures. This method, consistent with …
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Simulação de falta no enrolamento de campo de geradores síncronos pelo método dos elementos finitos
… detection technique, the air gap magnetic flux variation analysis, adapted to a computational simulation model. The simulation is performed by the finite elements method in the software Maxwell supported by its electrical machines modelling package RMXprt, both from Ansys property. In the study, …
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Many voices, many selves: An analysis of education blog discourses
… communication (CMC) studies have employed a variation analysis approach, quantitatively describing language on the Internet and comparing CMC to speech and writing. While these studies have provided valuable information about CMC, they have also left many gaps, especially related to social …
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Double-sided microchannel patterning and through-hole production using injection molding of polypropylene
… microscope and SEM images. A part-to-part variation analysis was conducted for ten parts by averaging the channel height, channel width, and hole diameter measurements obtained with an optical profilometer. The results were compared to a research study previously conducted on hot embossed …
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Novel machine learning approaches for modeling variations in semiconductor manufacturing
… thesis is to build machine learning models for variation analysis and yield improvement. In this thesis, we first propose a novel method to estimate and characterize spatial variations on dies or wafers. This new technique exploits recent developments in matrix completion, enabling estimation of …
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Does culture evolve?: testing evolutionary theories of culture through a case study of El Khiam points from three sites in the Pre Pottery Neolithic A of the Southern Levant
… Levant. Two complementary analytical techniques, variation and phylogenetic analysis, are applied to examine the patterns of attributes of El Khiam points. Variation analysis, specifically the coefficient of variation, is used to show patterns of reducing constraint in metrical attributes of …
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An on-chip test circuit for characterization of MEMS resonators
… characterize a large number of resonators for variation analysis and is general enough that it can be used with a wide range of resonators, not limited to specific frequencies or other properties. The proposed test circuit is based on a transient impulse response method using a current impulse …
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Tecniche di progettazione tollerante alle variazioni per circuiti digitali in tecnologie nanometriche
… size, resulting in a larger parameter variation in future technology generations. Furthermore, the exponential relationship between the leakage current and the threshold voltage, is limiting the threshold and supply voltages scaling, increasing the power density and creating local …
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Automated human age at death estimation system from long bones histology
… involve three main phases that includes, analysis of variations in microscopic characteristics of bone with age, developing age regression equation based on the variation analysis and estimation of age using regression equation. However manual age at death estimation is not only tedious …
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