D3S: A Framework for Enabling Unmanned Aerial Vehicles as a Service

In this paper, we consider the use of UAVs to provide wireless connectivity services, for example after failures of wireless network components or to simply provide additional bandwidth on demand, and introduce the concept of UAVs as a service (UaaS). To facilitate UaaS, we introduce a novel framework, dubbed D3S, which consists of four phases: demand, decision, deployment, and service. The main objective of this framework is to develop efficient and realistic solutions to implement these four phases. The technical problems include determining the type and number of UAVs to be deployed, and also their final locations (e.g., hovering or on-ground), which is important for serving certain applications. These questions will be part of the decision phase. They also include trajectory planning of UAVs when they have to travel between charging stations and deployment locations and may have to do this several times. These questions will be part of the deployment phase. The service phase includes the implementation of the backbone communication and data routing between UAVs and between UAVs and ground control stations

SURE: A Novel Approach for Self Healing Battery Starved Users using Energy Harvesting

Radio Frequency (RF) energy harvesting holds a promising future for energizing low power mobile devices in next generation wireless networks. Harvesting from a dedicated RF energy source acquires much more energy than simply harvesting from ambient RF sources. In this paper, novel Self-healing of Users equipment by RF Energy transfer scheme is introduced between the network operator and battery starved users to heal and extend their battery life time by sending dedicated energy from different sources in order to be aggregated and harvested by starved users. This approach depends on the concept of Energy as a Service where the network operator delivers energy to battery starved users in the next generation networks. A mixed integer non-linear optimization problem is formulated and solved efficiently using three heuristic algorithms. Simulation results prove that sufficient amounts of energy can be delivered to starved users while minimizing their uplink power requirements and guaranteeing a minimum uplink data rate

Reflection of Plane Waves at Free Surface of an Initially Stressed Dissipative Medium

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The Impacts of Egyptian-American Academic Research: The CU/MIT Program

Egypt has been and continues to be one of the major recipients of development assistance in the third world, yet very little effort has been made to assess the overall impact of this aid on Egypt A symposium was held on December 10th and 11th, 1983 in Oriental Hall at the American University in Cairo, organized by Cairo Papers in Social Science with financial support from the Cairo Office of the Ford Foundation. Egyptian government ministers, officials from representative donors and scholars experienced in development were invited to make formal presentations to the symposium. The essays presented in this issue were all presented at the symposiumhttps://fount.aucegypt.edu/faculty_book_chapters/1897/thumbnail.jp

The Political Economy of Non-Alignment

With the thaw of the cold war and the emergence of detente between the superpowers, it was widely argued that the policy of non-alignment had almost lost its relevance. Behind this belief was the assumption that non-alignment was the outcome of the cold war. However, non alignment did not go into oblivion as predicted by the cold war theory. On the contrary, the Movement was able to adapt itself to the new international conditions of the 1970\u27s and to reemerge bigorously as a major political force in the 1980\u27s. The papers published in this volume tackle these questions from various perspectives. The first two, written by two Indian scholars, provide us with a macroscopic viewpoint of the present international system and its impact on the primary orientations of the Non-Aligned Movement. The papers of Dr. Haroub Othman and Dr. Samir Ahmed review the political and organizational evolution of the Movement. Dr. Galal\u27s and Dr. Singh\u27s papers attempt to describe the security challenges of the Non-Aligned Move cent in the 1980\u27 s and the feasibility of formulating a Non-Aligned Security Doctrine. The next two contributions discuss the political economy of non-alignment. Dr. Selim\u27s paper reviews the emergence of the economic paradigm of non-aligned countries -- the evolution of the Movement of Non-Alignment as to form the main economic pressure group for Third World countries during the 1970\u27s and the basic obstacles which arc likely to influence the economic role of the Movement in Dr Bashai discusses the role of the Movement in North-South the negotiations and the fostering of South-South cooperation. In his second contribution to chis volume, Dr. Samir Ahmed discusses the particular nature of Africa\u27s non-alignment and the basic challenges which confront the continent its endeavor to preserve its non-aligned international status. Finally, Dr. Tadic and Dr. Farajallah succinctly tackle the difficult task of attempting co-identify the general global and structural problems which confront the Nonaligned Movement in the 1980\u27s and the prospects for the future.https://fount.aucegypt.edu/faculty_book_chapters/1884/thumbnail.jp

CHARACTERISTICS AND CHEMICAL KINETICS OF HYDROGEN SULFIDE COMBUSTION IN THERMAL CLAUS REACTOR

Hydrogen sulfide is a hazardous gas from both environmental safety and human health perspectives. Hydrogen sulfide presence in any combustion application results in the formation of acidic gases that affects ozone layer and causes acidic precipitation. Exposure to H2S levels at 100 ppm or higher can endanger human life. Hydrogen sulfide is commonly found to exist in crude natural gas and oil wells. With the decrease in fossil fuels reserves around the world, we will have to rely on extracting energy from wells that contain higher amounts of H2S. In addition, environmental regulations strictly regulate the H2S discharge into the atmosphere. Subsequently, efficient hydrogen sulfide treatment becomes of increasing importance with time. Hydrogen sulfide treatment is typically a chemical reaction process (Claus process) in which hydrogen sulfide is combusted to end-products of sulfur and water. Hydrogen sulfide combustion in thermal Claus reactor has been investigated in this research. A reduced reaction mechanism for H2S oxidation has been developed using a novel error-propagation-based approach for reduction of detailed reaction mechanisms. The reduced mechanism has been used for detailed investigation of chemical kinetics mechanistic pathways in Claus process. Experimental examination of H2S combustion in different flames, methane/air and hydrogen/air, is provided. Chemical kinetics pathways and reaction conditions responsible for sulfurous compounds formation (SO2, CS2, and COS) are addressed. Hydrogen sulfide flame emissions have been investigated for intermediate species identification using chemiluminescence flame spectroscopy. Effect of acid gas composition (H2S, CO2 and N2) on hydrogen sulfide combustion and Claus process efficiency is also provided. Finally, examination of the quality of captured sulfur with respect to reactor conditions is presented

Understanding walkability in the Libyan urban space: policies, perceptions and smart design for sustainable Tripoli

Walkability in civic and public spaces in Libyan cities is challenging due to the lack of accessibility design, informal merging into car traffic, and the general absence of adequate urban and space planning. The lack of accessible and pedestrian-friendly public spaces in Libyan cities has emerged as a major concern for the government if it is to develop smart and sustainable spaces for the 21st century. A walkable urban space has become a driver for urban development and redistribution of land use to ensure pedestrian and walkable routes between sites of living and workplaces. The characteristics of urban open space in the city centre play a main role in attracting people to walk when attending their daily needs, recreation and daily sports. There is significant gap in the understanding of perceptions, feasibility and capabilities of Libyan urban space to accommodate enhance or support the smart design of a walkable pedestrian-friendly environment that is safe and accessible to everyone. The paper aims to undertake observations of walkability and walkable space in the city of Tripoli as a benchmark for Libyan cities; assess the validity and consistency of the seven principal aspects of smart design, safety, accessibility and 51 factors that affect the walkability in open urban space in Tripoli, through the analysis of 10 local urban spaces experts (town planner, architect, transport engineer and urban designer); and explore user groups’ perceptions of accessibility in walkable spaces in Libyan cities through questionnaires. The study sampled 200 respondents in 2015-16. The results of this study are useful for urban planning, to classify the walkable urban space elements which affect to improve the level of walkability in the Libyan cities and create sustainable and liveable urban spaces