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 1162 for “"two-stage"”.
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A two-stage thermal modification of wood
… (< 200°C) including a moist and dry treatment stage. Several changes and/or modifications of the main components of wood (cellulose, hemicelluloses and lignin) appear to be involved in the effects of heat treatment on important wood properties like dimensional stability, strength/stiffness and …
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Parallel algorithms for two-stage stochastic optimization
We develop scalable algorithms for two-stage stochastic program optimizations. We propose performance optimizations such as cut-window mechanism in Stage 1 and scenario clustering in Stage 2 of benders method for solving two-stage stochastic programs. A naive implementation of benders method has …
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A two-stage model of category construction
… consisting of independent dimensions. A two-stage model of category construction is presented to specify the conditions under which FR categories would be produced. The first stage involved uni-dimensional sorting of most of the given exemplars into the prescribed number of groups. The …
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Bayesian Two Stage Design Under Model Uncertainty
Traditional single stage design optimality procedures can be used to efficiently generate data for an assumed model y = f(x<sup>(m)</sup>,b) + ε. The model assumptions include the form of f, the set of regressors, x<sup>(m)</sup> , and the distribution of ε. The nature of the response, y, often …
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Cellulose mineralization in two-stage anaerobic digestion systems
… solid waste/sludge, particulate cellulose, by two-stage anaerobic digestion systems. Cellulose hydrolysis and methanogesis were examined in both the thermo-meso and acid-methane two-stage systems under different hydraulic retention times (HRTs), feed concentrations and organic loading rates …
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TOWARD A TWO-STAGE MODEL OF FREE CATEGORIZATION
… i.e., the number of features shared by two objects. In a similarity rating task, people also rated objects sharing more features as more similar. However, the effect of matching features was approximately linear in the similarity task, but superadditive (exponential) in the labeling …
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Hyperspectral Image Compression Using a Two-Stage KLT
… the JPEG 2000 (extension 2) is replaced with a two-stage Karhunen-Loeve Transformation (KLT) operation resulting in a reduction in the computational complexity. At the first stage the spectral data is partitioned into sets of adjacent spectral images, which are decorrelated independently of one …
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Performance of the UBC two-stage light-gas gun
The performance of UBC two-stage light-gas gun and the associated diagnostics systems were examined under a variety of shot conditions. In the gas gun, the expansion of gas from burning gun powder propels a piston which, in turn, compresses and accelerates the low molecular weight pump gas. The …
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Two-stage model of destination image : exploring the consequences
… its feature of developing over time in several stages, there has been no attempt to examine pre- and post-visit destination images in integration. Therefore, based on the call by several scholars and theoretical support of its importance, the study set its purpose to examine the direct and …
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Chemistry, design, and processing of two-stage TRIP steel
… to obtain a ΔMs = -100 C° that exhibited the two-stage TRIP behavior. From this substitution the dynamic strain aging response could be mitigated through M₂₃(C,N)₆ precipitation trapping carbon and nitrogen. The work hardening behavior of these steels was found to be due to the Stage II (ε→α) …
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A merged two-stage converter for LED lighting applications
… an LED string. This thesis investigates a merged two-stage LED driver for lighting applications, with a switched capacitor (SC) voltage preregulator and a HF resonant-transition inverted buck current regulator. The design, analysis and implementation of the HF stage are developed in detail, and a …
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A two-stage experimental design procedure under dispersion effects
… the improved efficiency of a proposed two-stage experimental design procedure. In the proposed procedure the first stage estimates the heterogeneous variance structure and the second stage augments the first stage to produce a total design that is Q or D-optimal for the estimated …
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Design optimization for the two-stage bivariate pattern recognition scheme
… scheme becomes more challenging when involving two correlated variables, which are known as bivariate quality control (BQC). Generally, the traditional SPC charting schemes were known to be effective in monitoring aspects, but there were unable to provide information towards diagnosis. In order …
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Simulation of Coal Gasification Process Inside a Two-Stage Gasifier
… of coal gasification process inside a generic two-stage entrained-flow gasifier to produce syngas carbon monoxide and hydrogen. The simulations are conducted using the commercial Computational Fluid Dynamics (CFD) solver FLUENT. The 3-D Navier-Stokes equations and seven species transport …
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Two-stage acidic-alkaline pretreatment of Miscanthus for bioethanol production
… To address the issue, this research developed two innovative pretreatment methods successively. Miscanthus was used as the model feedstock. The effects of primary pretreatment conditions on the performance were examined. Process optimization was conducted to locate the best operational …
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Design of a two-stage multi-state experimental biogas reactor
Anaerobic digestion is a process that breaks down waste and other feed materials and produces biogas. A biogas reactor, or anaerobic digester, is designed to conduct anaerobic digestion in a closed environment and to collect the produced biogas. This is an important field of study because biogas is …
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Parallelized two-stage object detection in cluttered RGB-D scenes
… sections up to 38 times. We also built a two-stage pipeline that improves multiple object detection in cluttered scenes. The first stage aims to achieve high precision, even at the cost of lower recall, by detecting only the less occluded objects. This results in large fraction of the …
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Two-Stage Multi-Channel LED Driver with CLL Resonant Converter
… current balance and efficiency are always the two major concerns for LED driver. A simple two-stage multi-channel LED driver is proposed. It is composed of a buck converter as the first stage and a multi-channel constant current (MC3) CLL resonant converter as the second stage. For the CLL …
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High Frequency, High Efficiency Two-Stage Approach for Future Microprocessors
… deal when compared with 5V-input VR efficiency. Two-stage approach is proposed in this dissertation to solve this issue. The analysis shows that the two-stage conversion has much better high frequency capability than the conventional single stage VRs. Based on today's commercial devices, 2-MHz is …
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