Rich vehicle routing: A data-driven heuristic application for a logistics company

Changing online shopping behaviors have resulted in the emergence of different product and services that aim high customer satisfaction. In this thesis, we develop an alternative approach to solve problem of a logistics company, which operates solely for e-commerce transactions, using an Adaptive Large Neighborhood Search (ALNS) heuristic. To understand the nature of the distribution system and for the development of the solution procedure, we create, preprocess and analyze a dataset constructed from company’s database that is used for daily operations. The proposed solution provides a prioritization mechanism for the deliveries based on certain specifications related to deliveries. To evaluate the performance of the proposed ALNS, we perform computational experiments using scenarios with real-life instances extracted from the dataset. Our results show that, the proposed ALNS can produce solutions with high quality regarding customer satisfactio

Processing And Modeling Of Porous Copper Using Sintering Dissolution Process

The growth of porous metal has produced materials with improved properties as compared to non-metals and solid metals. Porous metal can be classified as either open cell or closed cell. Open cell allows a fluid media to pass through it. Closed cell is made up of adjacent sealed pores with shared cell walls. Metal foams offer higher strength to weight ratios, increased impact energy absorption, and a greater tolerance to high temperatures and adverse environmental conditions when compared to bulk materials. Copper and its alloys are examples of these, well known for high strength and good mechanical, thermal and electrical properties. In the present study, the porous Cu was made by a powder metallurgy process, using three different space holders, sodium chloride, sodium carbonate and potassium carbonate. Several different samples have been produced, using different ratios of volume fraction. The densities of the porous metals have been measured and compared to the theoretical density calculated using an equation developed for these foams. The porous structure was determined with the removal of spacer materials through sintering process

Religious Nationalism in the Kurdistan Region of Iraq

This thesis explores a new political phenomenon in the Middle East - the reconciliation of nationalism and Islamism by Islamic political parties in the context of nation states. Although the concept of religious nationalism has been discussed substantially before, as for example in Juergensmeyer (1993: 40) where the author defines religious nationalism as “the attempt to link religion and the nation-state”, this work highlights that a new brand of religious nationalism has emerged in the Middle East as the result of the intertwining of nationalism and Islamism. The focus of this study is, therefore, on the development of religious nationalism in the continuously tumultuous region of the Middle East. The aim of this researchis to investigate whether Islamism in Kurdistan is limited by the politics of nationalism, which is an accentuated example for the whole Middle East region. Furthermore, it should be noted that many of the religious nationalists themselves have not yet fully acknowledged the existence of the trend of merging between Islamism and nationalism. For instance, although the position of the Muslim Brotherhood of Kuwait, during the liberation of their state from the Iraqi regime, is a clear example of religious nationalism, all other affiliations of this organisation around the world at that time viewed the military operation as a foreign occupation. Highlighting this historical juncture in the political life of the Middle East by studying the Islamism in the Kurdistan region helped to elaborate on this new type of politics exceptionally well. This is essentially due to the absence of a politically recognised nation state which renders Kurds to be particularly susceptible to various manifestations of nationalism. The key finding of this project was, therefore, the notion that Islamism in Kurdistan has become significantly framed by the politics of nationalism

Processing And Modeling Of Porous Copper Using Sintering Dissolution Process

The growth of porous metal has produced materials with improved properties as compared to non-metals and solid metals. Porous metal can be classified as either open cell or closed cell. Open cell allows a fluid media to pass through it. Closed cell is made up of adjacent sealed pores with shared cell walls. Metal foams offer higher strength to weight ratios, increased impact energy absorption, and a greater tolerance to high temperatures and adverse environmental conditions when compared to bulk materials. Copper and its alloys are examples of these, well known for high strength and good mechanical, thermal and electrical properties. In the present study, the porous Cu was made by a powder metallurgy process, using three different space holders, sodium chloride, sodium carbonate and potassium carbonate. Several different samples have been produced, using different ratios of volume fraction. The densities of the porous metals have been measured and compared to the theoretical density calculated using an equation developed for these foams. The porous structure was determined with the removal of spacer materials through sintering process

Dead Time in the Gamma‐Ray Spectrometry

A review of studies of the dead time correction on gamma-ray spectroscopy is presented. Compensate for counting losses due to system dead time is a vital step for quantitative and qualitative analysis. The gamma-ray spectroscopy system consisting of electronic devices are used for detection of radiation due to gamma rays. The dead time of the spectroscopy system is based on time limitations of these electronic devices. Firstly, a new model for determination of this electronic dead time is proposed. Secondly, two alternative methods suggested for the correction of this electronic dead-time losse

Enhancement Of Transmission Control Protocol Performance Over Low Earth Orbit Satellite Links

Recent growth of the Internet has led to the development of Internet services everywhere and over every possible communications medium. Here, Low Earth Orbit (LEO) Satellite has been addressed as a medium for supporting services based on the Transmission Control Protocol (TCP). Basically, TCP was proposed as a common transport protocol for the Internet. The TCP mechanisms have been modified overtime and almost standardized for wired networks. However, for wireless communications still further modifications are needed for TCP mechanisms. Particularly, in this study an Enhanced Selective Acknowledgement (ESACK) mechanism has been proposed to improve the performance of TCP over LEO satellite links. The ESACK detects the network congestion and adjusts the transmission window by considering losses in two consecutive windows