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Showing 1 to 20 of 950 for “"Stepwise"”.
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Stepwise Reconstitution of RNA Cellular Activity
<p>Modern biomedical science enjoys an unprecedented ability to identify and describe viral pathogenic mechanisms, as well as characterize the biomolecular components that constitute them. However, we have not yet achieved a fully quantitative biophysical understanding in which modeling of …
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Stepwise Evolutionary Training Strategies for Hardware Neural Networks
… are required. Within the scope of this thesis, a stepwise training approach has been devised that allows for the use of simple evolutionary algorithms to efficiently optimize the synaptic weights of a fast mixed-signal neural network chip. The training strategy is tested on a set of nine …
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An Extension of Stepwise Variable-Reduction Procedures for Canonical Analysis
Made available in DSpace on 2014-12-10T18:48:15Z (GMT). No. of bitstreams: 1 7511663.pdf: 2788471 bytes, checksum: c60b7eb36995358ae55840ea5cf2034c (MD5) Previous issue date: 1974
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A stepwise test characteristic curve method to detect item parameter drift
… as close as possible. This paper introduces a stepwise test characteristic curve (Stepwise TCC) method to dynamically detect item parameter drift based on TCC without requirement to set any critical values. Comparisons were made between the new method and two commonly used existing methods …
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A Stepwise Canonical Approach to the Selection of 'Kernel' Variables Fromtwo Sets of Variables
Made available in DSpace on 2014-12-10T18:46:39Z (GMT). No. of bitstreams: 1 7317386.pdf: 5382777 bytes, checksum: d6fdefc541d865c61efacaa78c1c6d70 (MD5) Previous issue date: 1972
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A stepwise Study on the characterisation and processing of South African Platinum Group Tailings
The endurance of the mining industry has led to the near-depletion of some of the most processible ore types. This has resulted in a unique challenge that necessitates unique innovation for the industry. Firstly, existing technologies are increasingly geared towards improved efficiency in …
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A stepwise methodology for the calculation of interlaminar stresses in transversely-loaded grooved laminates
A stepwise methodology to assist in the development of a model to determine the interlaminar stress fields and the mechanisms that give rise to these stress fields in transversely-loaded grooved composite laminates was developed. The methodology consists of five steps, with each step representing a …
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A heterojunction bipolar transistor with stepwise allog-graded base : analysis, design, fabrication, and characterization
(cont.) features but the device self-heating turned out to be crucial for the longevity of the base micro-airbridges. The short lifetime of the base micro-airbridges was prohibitive for the realization of high frequency measurements. This work serves as the foundation for the implementation of …
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Reductive and oxidative dissociative electron transfers: transition between the concerted and stepwise mechanistic pathways
… epoxyketones) the mechanism proceeds in a stepwise fashion, where the electron transfer and bond breaking reactions occur in sequential, discrete steps. On the other hand, where there is no additional resonance stabilization afforded to the ring-closed epoxide radical anion (aliphatic …
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STEPWISE DIFFERENTIATION OF IL21-PRODUCING FOLLICULAR HELPER T CELLS REVEALS DISTINCT DEVELOPMENTAL AND FUNCTIONAL STATES
The interaction of follicular helper T (Tfh) cells with B cells within the germinal center of secondary lymphoid organs is essential for the formation of high affinity antibodies, a key effector mechanism of adaptive immunity. Interleukin (IL)-21 is a proinflammatory cytokine produced by Tfh cells, …
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Variable screening and model selection in censored quantile regression via sparse penalties and stepwise refinement
Many variable selection methods are available for linear regression but very little has been developed for quantile regression, especially for the censored problems. This study will look at the possibilities of utilizing some existing penalty variable selection methods on censored quantile …
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DNA topology and Pol II CTD phosphorylation as stepwise regulators of chromatin architecture in differentiating human stem cells
… organisation. This coordination supports the stepwise assembly of cell type-specific transcriptional hubs – in which a gene, its enhancer, and novel intergenic elements are scaffolded into a functional regulatory unit – and illustrates a general principle by which genome topology and Pol II …
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Electrochemical oxidation of aliphatic carboxylates: Kinetics, thermodynamics, and evidence for a shift from a concerted to a stepwise mechanism in the presence of water
… electron transfer (cDET), rather than stepwise as was previously reported. To further investigate the mechanism, a series of aliphatic and aromatic tetra-n butylammonium carboxylates were synthesized and investigated via convolution and conventional methods under anhydrous conditions …
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The 21-dehydroxylation of corticosteroids: evidence for an enol intermediate and the hydroxylation of steroids by fungal cyto-chrome P450: evidence for a stepwise mechanism
Two enzyme mechanisms were examined: the 21-dehydroxylation of corticosteroids by the anaerobe Eubacterium l en tum, and the hydroxylation of steroids by fungal cytochrome P450. Deuterium labelling techniques were used to study the enzymic dehydroxylation. Corticosteroids doubly labelled (2H) at …
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Laminar flow with an axially varying heat transfer coefficient
… approximation method, an iterative method and a stepwise periodic method. The stepwise periodic method provides the most convenient and accurate solution for a stepwise periodic Biot number. Graphical results match exactly to ones obtained by Charmchi and Sparrow from a finite-difference scheme. …
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The examination of mechanisms underlying meiotic chromosome segregation
… contribute to meiotic segregation, including stepwise loss of meiotic cohesion, proper prophase progression and homolog pairing. I have found that stepwise cohesion loss is regulated by multiple mechanisms, including bulk phosphorylation of the meiotic cohesin Rec8. I also find that homolog …
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Toward an Understanding of the Effect of Market Share on Median Home Sale Price
… with median home sales price. Through a stepwise regression of the independent variables it is determined that there is no correlation between median home sale price and market share of the top 10 home builders. In the stepwise regression two variables are found to be correlated to median …
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A Comparative Analysis of Cognitive Differences Among Female Elite and Nonelite High School Field Hockey Players and High School Physical Education Class Nonathletes
… each subtest within a cognitive category, and a stepwise multiple regression technique to determine which tests made the greatest contribution to predicting group membership. Multiple analysis revealed that the elite group displayed significantly higher sport-confidence and selected psychological …
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