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The economic situation of the recent years forces to operate aircraft at highest payloads possible and to load it at its maximum allowable take-off masses. Therefore, take-off performance optimization is nowadays as important as never before. This book offers a summary of factors affecting the maximum take-off mass and appropriate take-off speeds, which together represent necessary performance data for a safe take-off. These are usually presented in so called runway analyses. That is the reason why this book might be of interest for fight operations engineering personnel or pilots as it answers possible questions about the application and computing of the runway analyses.

Ethiopia has the lowest access to potable water supply in Africa despite its abundant water resource. In the Edja Woreda of Guraghe Zone, the average distance travelled to collect water is 46 minutes. The financial sustainability of the drinking water sector in the Woreda remains an issue for all stakeholders: the providers, the users, government agencies and donors. There is no clear guidance for water activities at Woreda level. Thus, there are no clearly specified roles and responsibilities. Therefore, the general objective of the study is to identify the challenges and prospects of potable water management in the Edja Woreda.

Due to the mobility of its users, GSM systems are vulnerable to an unauthorized access and eaves droppings when compared with the traditional fixed wired networks. The main idea of this project is to develop an application device in order to secure mobile banking over unsecure GSM network. It is important to mention that mobile banking is a term that is used for performing balance checks, account transactions, payments, credit applications, and many other online applications. Unfortunately, the security architecture for cellular network is not entirely secure. As a matter of fact, GSM network infrastructure is proved to be insecure. Many possible attacks are documented in literature. For security was never considered in the initial stages, the sending of protective banking information across an open mobile phone network remains insecure. Consequently, this project focuses entirely on the development and design of security techniques in order to asses some security issues within mobile banking through cellular phone network (GSM). The main aim of this project is to investigate and examine the following:1. Security issues in each level of the mobile network architecture. 2. Messages and signals exchanged between user's cellular phone and mobile network at each level. 3. The overall security architecture of GSM flaws. 4. Some existing security measures for mobile transactions. 5. The current security within SMS banking and GPRS banking. Finally, two folded simulations in MATLABT were performed using OFDM which is a broadband multicarrier modulation method that provides a high performance operation to transmitted and received data or information.