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In this chapter, a Mathematical model is proposed to the study of depletion of a uniformly distributed forest biomass caused by different levels of industrialization and population in two adjoining regions of the habitat. Industrialization dependent, constant, instantaneous, and periodic emissions of pollutant into the environment are taken into consideration. Criteria for local stability, instability, and global stability of non-negative equilibrium are obtained in the absence of diffusion and in presence of diffusion. A model of a single species population living in two patch habitats with migration between them across a barrier was proposed by Freedman and Waltman [5]. The model was extended in [17,19] to include the case where animal species leaving one habitat does not necessarily reach the other habitat, the existence of a positive equilibrium as a function of barrier strengths was examined. Also Freedman [7] studied a single species diffusion model by assuming that the habitat consists of two patches and has shown that there exists a positive, monotonic, continuous non uniform steady state solution that is linearly asymptotically stable under both reservoir and no-flux boundary conditions.

Mobile Ad-hoc Networks (MANET) is the self organizing collection of mobile nodes. The Optimized Link State Routing (OLSR) protocol was designed to improve scalability of Mobile Ad-Hoc Networks (MANETs). OLSR protocol implements Multipoint Relay (MPR) nodes as a flooding mechanism for distributing control information. Nevertheless, OLSR was designed without security measures. There-fore, a misbehaving node can affect the topology map acquisition process by interrupting the flooding of control information or disturbing the MPR selection process.

We are very happy to announce that from 28th February 2013, Mr. Amir Samimi has joined the team of Elixir Editorial Advisory Board. He will carry a special responsibility for dealing with manuscripts based on corrosion in oil and gas industry, Environment Engineering, Chemical Engineering. Mr. Amir Samimi is currently working as Young Researchers and Elit Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran. The appointment of Mr. Amir Samimi as member Editorial Advisory Board strengthens the links and will make it easier for prospective authors to establish contact with the journal. Please send any expressions of interest to chiefeditor@elixirjournal.org. Sincerely Editor-in-Chief

We are very happy to announce that from 10th May 2013, Mr. Moshtak Abdulatheem Jwad Wtwt has joined the team of Elixir Editorial Advisory Board. He will carry a special responsibility for dealing with manuscripts based on Internal Medicine. Mr. Moshtak Abdulatheem Jwad Wtwt is currently working as College of Medicine, Babylon University, Babylon, Iraq. The appointment of Mr. Moshtak Abdulatheem Jwad Wtwt as member Editorial Advisory Board strengthens the links and will make it easier for prospective authors to establish contact with the journal. Please send any expressions of interest to elixirpublishers@gmail.com. Sincerely Editor-in-Chief

We are very happy to announce that from 28th March 2015, Mr.Sunny Narayan has joined the team of Elixir Editorial Advisory Board. He will carry a special responsibility for dealing with manuscripts based on Noise and Harness and Vibrations. Mr.Sunny Narayan currently working as Assistant Professor and Coordinator, Department of Mechanical Engineering, Indus International University, India. The appointment of Mr.Sunny Narayan as member Editorial Advisory Board strengthens the links and will make it easier for prospective authors to establish contact with the journal. Please send any expressions of interest to elixirpublishers@gmail.com.

Moore's Law has been greatly depended upon for the development of Electronic computers as they have also been regarded as traditional computers which cannot meet the high speed and bandwidth demands of the future. This led to the emergence of researchers in the field of computer engineering that began to work towards optical computing systems. Therefore, this paper seeks to examine optical computing as one of the major trends in Information Technology (IT) industry in the perspectives of its pros and cons towards recommendations that will further improve IT industry.

Direct sequence code division multiple access (DS-CDMA) is a popular wireless technology. This system suffers from Multiple Access Interference (MAI) caused by Direct Sequence users and Near –far effect. Multi-User Detection schemes are used to detect the users’ data in presence of MAI and Near- far problem. In this dissertation, we present comparative study between linear multiuser detectors and conventional single user matched filter in DS-CDMA system. Analysis and simulations are conducted in synchronous AWGN channel, and Gold sequence and Kasami sequence are used as the spreading codes. Simulation results depict the performance of three detectors, conventional detector, Decorrelating detector and MMSE (Minimum Mean Square Error) detector. It shows that the performance of these detectors depends on the length of PN code used and Number of users. Linear multiuser detectors perform better than the conventional matched filter in terms of BER performance. All the simulations have been performed on MATLAB 7.0.

In both developed countries, privatization and in some cases commercialization have grown in popularity and acceptability. It has also become an important instrument that government can use to promote economic development, improve the production and distribution of goods and services, stream line government structure and reinvigorate industries controlled or managed by the state. The magnitude of persistent failure of public enterprises has alarming rate due largely high level corruption. Even when faithful implementation was supposed to result in efficiency effective and economic to the economy and consumers alike there continued to a derail from reality. The study methodology applied survey design and use Pearson product moment correlation coefficient. The study revaled that privatization promotes economic development. Privatization is a major road map to sustainable economic development. Hence creation of employment opportunities, four prices and competition but unfortunately public power as example the expectations from privatization have not been realized in Nigeria. It has been at the detriment of the households. The study recommends that there should faithful implementation of privatization, and it should be implemented with vigour.

This paper analyzed the latest development of ESL teaching and gave a new definition about college English teacher from postmethod’s perspective. Through discussion on difficulties faced by college English teachers, this paper also analyzed the characteristics about college English teachers’ professional development, and gave new thoughts and methods for college English teachers to promote their professionalization.

The aim of research is to determine the most important role of teachers teaching and learning (TTL). The instrument of data collection was a questionnaire, the sample 243 teachers. The data were analysed using descriptive /multiple regressions. The findings shown that teacher collaboration, share resources, teachers’ monitored, Student progress carefully monitored and working for improvement. Teachers constantly monitored by supervisors /principals for purpose of improving (TTL). The research has implications for teachers’ to be effective. The novelty of research has covered all parameters of teachers’ roles. This will contribute to improving teachers’ in educational system for the future research.