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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 1 to 3 of 3 (0.017 seconds)

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1

Optical Properties of In1-xGaxN Epilayers Grown by HPCVD

Wang, Jielei, Ms 23 August 2010 (has links)
Optical absorption spectroscopy has been applied to study properties such as the fundamental absorption edge and defect absorption centers of group III-nitride compound semiconductor epilayers. The investigation in this thesis focused on analyzing the band gap of indium-rich In1-xGaxN epilayers, which where grown by the high-pressure chemical vapor deposition (HPCVD) technique. Our results - together with literature data for gallium-rich In1-xGaxN alloys indicate that the shift of the fundamental band gap of In1-xGaxN with composition x can be described with a bowing parameter of b = 2.2eV. Temperature dependent transmission measurements show that the band gap variation with temperature follows a S-shape behavior for small gallium concentration and shifts towards a Varshni type behavior for a higher gallium concentrations. The S-shape behavior is attributed to nanoscale compositional fluctuations/clustering in the ternary alloy system. The thicknesses of the measured In1-xGaxN epilayers have been analyzed through multilayer stack model calculations of the transmission spectra. The free electron concentration in the In1-xGaxN epilayers has been obtained from simulations of infrared reflectance spectra.
band gap
absorption
In1-xGaxN
transmission
multilayer stack model
S-shape behavior
Astrophysics and Astronomy
Physics
2

Optimizing the Multi-Objective Order Batching Problem for Warehouses with Cluster Picking

Aboelfotoh, Aaya H. F. 18 September 2019 (has links)
No description available.
Industrial Engineering
Operations Research
Engineering
Order Batching
Order Batching Problem
Order Picking
Cluster Picking
Wave Picking
S-Shape
Total Distance
Aisle Congestion
Multiple Intervals
Optimization
Mathematical Model
Differential Evolution
Greedy Heuristic
3

Comparison of Several Project Level Pavement Condition Prediction Models

Nimmatoori, Praneeth January 2009 (has links)
No description available.
Transportation
Civil Engineering
Engineering

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