Physical Sciences and Engineering

This study examined the predictors of tramadol abuse among undergraduatesin Ignatius Ajuru University of Education, Port Harcourt. Two objectives and two research questions were guided this study. Multi-stage sampling procedure was adopted for the study population for the study consisted5117 students from selected faculties in the university. The sample size was determined using Yaro Yamane’s method for a finite population (n = 400).

Background: The current study was conducted to establish registry for physical therapy database of cerebral palsy patients in Mina city and its surrounding cities including (Maghagha, Matty, Mallawi, Samallott, Abu-Qurqase and Deirmawas). Children with CP were recruited from hospitals of health ministry (general hospitals), insurance hospitals, pt centers, private hospitals and units of family medicine in Minia governorate. Children were of both genders and their age ranged from birth to 18 years old.

Due to the increasing power demand, the security and safety of power systems have become major challenges. Distributed energy resources have been established for solving the problem. The fault current may exceed the capacity of circuit breakers (CBs); leading to damage to CBs and even cascading incidents such as blackouts. A fault current limiter (FCL), which can be used to reduce the current surges, has attracted considerable attention from utilities. Penetration of distribution generation is inevitable one.

The main aim of our project is to implement the 5 level neutral point clamped (NPC) inverter output using three terminal topology (3T) with open switch fault detection. Normally the grid coupled inverters to reduce the common mode leakage current we use the NPC inverter. In this type we need more number of components and to achieve the five level output. In our proposed system we use the 3T converter to achieve the 5 level output at reduced number of switches. In experimental result we use 5 level 3T converter with 4 switches.

The objective of the paper is to design and implementation of an intelligent device for monitoring the electrical parameters of household appliances and subsequently calculates the power consumed on daily demand prediction. The developed system is a low-cost, flexible in operation and can save electricity expense of the consumers. This system can detect the high and low voltage passing in the line as well as the short circuit by using short circuit detector. Through Wi-Fi, the information is sent to the server for informing that there is any short circuit.

The uni-polar sinusoidal pulse width modulation full- bridge transformer-less photovoltaic (PV) inverter can achieve high efficiency by using latest super junction metal–oxide– semiconductor field- effect transistor (MOSFET) together with silicon carbide (SiC) diodes. Though, the MOSFETs are definite to use in transformer-less PV inverter due to the low reverse- recovery characteristics of the body diode.

The main electrical stations in Nellore owns and operates over 60,600 Distribution Transformers (DTs) and loses over 10,000 DTs annually either with major or minor problems. At present, manual calculations or peak load analysis scheme was using by the electrical board to determine the transformer load conditions and effect the load growth and transformer losses, which is a difficult task and doesn’t solve the problem of DT failure resulting from; load unbalance, over load, vandalism among others.

The grid inverter plays a vital role in new energy development and utilization. By improving its energy efficiency and the crisis in transfer of power advances the structure for photovoltaic (PV) grid inverter with good performance can be achieved. The inverter control system has its high speed and flexibility. The source harmonic current is remarkably reduced. The SEPIC converter allows a range of dc voltage to be adjusted to maintain a constant voltage output. The simulation model of the photovoltaic generation is established based on MATLAB/SIMULINK.

In this paper, we give a subjective and quantitative study of The Simulation of Link-State Routing Protocol which is a part of the project under course CSE - Computer Networks & Communication. The program accepts the network topology details in terms of the cost of links, and provides the shortest path tree for the network. It uses Dijkstras Algorithm to construct its routing table.

Actual systems of water supply are endangered by decreasing of ground water level, due to the mining activities in the vicinity. By this way, the capacity of water sources for inhabitants is decreasing, too. Realized study, using several basic equations of fluid mechanics, presents various possibilities, how to cover the water deficiency.