Archives-June... 

This paper effort to describe a pioneering method of generating eco-friendly electrical energy that could be obtained from the wind energy harnessed from train. The energy generated from this method can be used to partially fulfil the daily power needs of human being. The method for generating electricity is by using the wind pressure which is generated by fast moving vehicles (train). By channelling the induced wind in the direction of the wind turbine and to convert the kinetic energy of the wind into mechanical energy with the help of wind turbine. The converted mechanical energy is converted into electrical energy with the help of an alternator. The ultimate aim of this project is to develop much cleaner and cost effective way of power generation, which in turns helps to bring down the global warming and to reduce the power shortages. The idea explained here does not interfere in the normal working of the moving train.

The present paper discusses an approximate solution of the Burger’s equation arising in longitudinal dispersion phenomenon in groundwater flow. In the porous medium pure water, salt water or contaminated water disperse in longitudinal direction gives rise to a non-linear partial differential equation in the form of Burger’s equation. The equation is solved by the optimal homotopy analysis method. The longitudinal dispersion phenomenon may be miscible or immiscible fluid flow through porous media. The problem of miscible displacement can be seen in the coastal areas, where fresh water beds are gradually displaced by sea water. Longitudinal dispersion phenomenon plays an important role to control salinity of the soil in seashore region. The governing non-linear Burger’s equation has been solved by optimal homotopy analysis method and the numerical and graphical representations have been given.

Numerous schemes have been proposed for secure routing and Intrusion Detection for ad hoc net- works. Yet, little work exists in actually implementing such schemes on small handheld devices. In this paper, we present a proof-of-concept implementation of a secure rout- ing protocol based on AODV over IPv6, further reinforced by a routing protocol independent Intrusion Detection System (IDS) for ad hoc networks. Security features in the routing protocol include mechanisms for non-repudiation and authentication, without relying on the availability of a Certificate Authority (CA) or a Key Distribution Center (KDC). We present the design and implementation details of our system, the practical considerations involved, and how these mechanisms can be used to detect and thwart malicious attacks. We discuss several scenarios where the secure routing and intrusion detection mechanisms isolate and deny network resources to nodes deemed malicious.

This paper reviews, appraises, and critiques theoretical and empirical research on the connections between the operation of the financial system and economic growth. It describes the role of financial system development in economic growth at the macro level, both theoretically and empirically. It also describes briefly the relationship of corporate finance and firm performance. It finally concludes the review and presents some policy implications in view of the reviewed literature. Furthermore, theory and evidence imply that better developed financial systems ease external financing constraints facing firms, which illuminates one mechanism through which financial development influences economic growth. The paper highlights many areas needing additional research.

Plant extracts of various parts viz., seeds, leaves, bark, roots and seeds have been used for water puri?cation for many centuries. According to UNICEF about 15 % population of the world is facing safe drinking water problem and 5 million people died once a year (WHO, 2006). Different plant parts of Strychnos potatorum, Tamerindous indica, Cyamopsis psoraloides, Hibisicus sabdariffa, Trigonella foenum, and Lens esculenta have been conducted using raw water with turbidity that ranged from 50 to 7500 NTU (Nephelometric Turbidity Units). The activity of Lantana leaves were tested by two experiments. In experiment 1 colony count and turbidity methods was followed whereas in experiment 2 only colony count method was followed. The increasing concentration from 1-10 reduced the bacterial growth and turbidity also decreased with increase the concentration.

Internal organizational communication plays an important role in facilitating effective and efficient library operations and service delivery. However, over the years, the University of Nairobi library system, scattered across six campuses, has registered many complaints, both from the Library staff and users of information services due to poor internal organizational communication. The aim of this study was, therefore, to analyse the existing internal organizational communication at the University of Nairobi library system with the view of suggesting ways in which it can be enhanced. The objectives of the study were: to determine the effectiveness of the used forms and channels of internal communication on the execution of library operations and services; to establish the internal communication policy framework governing internal communication at the university library system and to suggest ways of optimising the use of forms and channels of internal communication to enhance library operations and services. The study population was composed of various cadres of University of Nairobi Library staff stationed at the six campuses. Out of 167 members of the library staff, 45 were purposefully and randomly selected to form the study sample. Data was collected using face-to-face interviews and documentary reviews. Data was analysed thematically and presented by use of descriptive statistics. The findings of the study revealed that internal organisational communication was largely inadequate due to variations in communication practices in the various branches of the Library and an inefficient internal communication policy. The study subsequently recommends a review of the existing communication policy and streamlining of the internal communication practices to improve library operations and Services.

Magnetic bearing centrifugal pumps are the latest model of artificial hearts for long-term use. The impeller is the only moving part in these pump which can leads to lower blood damage due to travel through the pump. In this paper computational fluid dynamics as an advanced tool is employed to simulate blood dynamics in a magnetic bearing centrifugal pump. Different simulations are performed for various ranges of device speeds (2000, 3000 and 4000 rpm) and various flow rates (1, 2,3,5,7 and 9 ). As a main performance of the pump, hydraulic pressure rise is investigated. The results show that the pump can generate sufficient pressure due to different physiological activities. Also shear stress distribution specified that stress around the pump’s blades (high potential regions for blood damage) is less than 98 pa which is much lower than critical stress for blood pumps.

A digraph D is a pair (V, A), where V is a non-empty set whose elements are called the vertices and A is the subset of the set of ordered pairs of distinct elements of V. The elements of A are called the arcs of D. A vertex v is a boundary vertex of u if d(u, w) ? d(u, v) for all w ? N(v). The boundary digraph BD(G) of a graph(digraph) G is the digraph that has the same vertex set as G and an arc from u to v exists in BD(G) if and only if v is a boundary vertex of u in G. The boundary neighbor digraph BND(G) of a graph G is the graph that has the same vertex set as G and a directed edge (arc) from u to v exists in BND(G) if and only if v is a boundary neighbor of u in G.

This study aims to investigate the influence of burnout on job satisfaction among Chinese Independent Secondary Schools (CISS) teachers. The respondents for this study consist of 175 teachers selected randomly from five CISS from one of Northern State of Peninsular Malaysia. Data from respondents was collected using a translated version of questionnaire consisting of 3 parts, namely demographic, Maslach Burnout Inventory - Educators Survey (MBI - ES), and finally Job Satisfaction Survey (JSS). The results show that the level of teacher burnout dimension of emotional exhaustion, and personal accomplishment are moderate. Whereas the burnout dimension of depersonalization was at low level. Meanwhile multiple regression analysis shows that only teacher burnout dimensions emotional exhaustion have a significant negative influence on CISS teacher job satisfaction. Findings suggest that the CISS organizations should pay more attention on teachers’ psychological aspect such as teacher burnout in the workplace in order to generate better quality of teachers’ job satisfaction and performance.

This paper investigtaes a comparative evaluation of carrier-based pulsewidth modulation (CB-PWM) methods devoted to the control of a B3-VSI, also known delta inverter, feeding an open-loop induction motor (IM) drives. Four CB-PWM methods namely: (i) sinusoidal PWM (SPWM), (ii) third-harmonic injection PWM (THI-PWM), (iii) optimal PWM (OPT-PWM), and (iv) space-vector PWM (SV-PWM) are analytically presented in order to control a delta inverter. The performance of the CB-PWM methods under consideration are firstly presented and therefore their control performances are analyzed and compared based on simulation and experimental results. The comparison is achieved by an investigation of the total and partial harmonic distortion ratios of the IM stator phase currents.