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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.

Search results

Showing 1 to 2 of 2 (0.017 seconds)
1

Dynamic assignment protocols for multi-wavelength gigabit-PONs

Gliwan, A. January 2011 (has links)
The research initiatives addressed in this thesis are geared towards improving the performance of passive optical networks through the development of advanced dynamic bandwidth allocation protocols. In particular, the aim of the research undertaken is to enhance the quality of service offered by standard passive optical networks with reduced network costs. To that extent, a dynamic multi-wavelength protocol has been developed to increase the network upstream bandwidth and introduce multiple service levels to a fibre to the home-based giga-bit passive optical network. Simulation results have confirmed the reduction of the mean packet delay by adjusting the ITU-T standard G984 giga-bit passive optical network frame format by means of the introduction of extended wavelength band overlay based on the ITU-T Coarse- Wavelength Division Multiplexing grid to support the multi-wavelength functionality. To evaluate the multi-wavelength upstream operation of the newly implemented models in OPNET, 2-dimensional Dynamic Bandwidth Allocation algorithms have been introduced to manage the network resources in both the time and wavelength domains. Furthermore, the enhanced traffic allocation among the supported wavelengths in new protocol confirmed a performance improvement in the network total capacity and the mean packet delay, which demonstrates the network reliability and improves the quality of the provided service according to the subscriber service level agreement, with a minimum guaranteed bandwidth of 100 Mbit/s to fulfil applications and associated bandwidth requirements for the next generation access network.
621.381045
2

Girth Welding of Internally Clad API 5L Grade X65 Pipes using Low Alloy Steel Filler Metal

Alvarez, Alejandro January 2021 (has links)
No description available.
Composition
Design
Engineering
Materials Science
Metallurgy
Ocean Engineering
Petroleum Engineering
dissimilar materials
dissimilar metal welds
DMW
girth welds
girth welding
pipelines
Ni-based alloys
Low alloy steel
welding of internally clad pipes
welding of high strength steel
arc welding
alloy 686
ER80S-G
CMT
GMAW-P

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