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Scientific Research Journal

Scirj Volume III, Issue IX, September 2015 Edition
ISSN: 2201-2796


Publication starts: 25th September 2015
Full Paper available from: 25th September 2015


Evaluation of Percentage Wasted Power in Electrical Loads with Constructed Power Factor Correction Equipment
Afolabi O.M

Abstract: Fixed capacitive low power factor correction measurements was done to calculate percentage wasted power. The output of the nine operational amplifier voltage comparator controlled stabilizer was connected to a fixed CBB61; 450V 2uF AC run capacitor unto which each load was connected and computation of apparent power, power factor and percentage wasted power were made. It was found that very high percentage of required real power was wasted when power factor was uncorrected in electrical appliances studied. 52% of power was wasted in three laptops combination that reduced to 8.6% after CPF compare to 36.5% when 3 loads comprising of a laptop, printer and electric fan was used that was reduced to 3.3%. Minimum power was wasted in Philips Elance 3100, Electric iron with 32.3% when the power factor was uncorrected and 3.2% when power factor was corrected.
Read Full Paper Reference this paper Page 1-7


Comparism of Single Phase Power Factor Correction for Series and Parallel Topologies
O.M.Afolabi, E.O.Ogunniyi

Abstract: This paper presents dc ac and ac ac converter circuits including series and parallel switch capacitors topologies for electrical power factor correction equipment. Two parallel and series connection are made and tested to know the best method of connection to achieve an improved electrical power factor for eight loads. The output of the Centre-tap-transformer is connected to the input of the power factor correction (PFC) equipment measuring circuit after dc-ac or ac-ac selecting Electromagnetic Relay 1. A Single-Throw-Single-Pole switch is connected across the circuit so as to switch between the parallel and series topologies; while the output of this section is connected to the socket where loads are applied for measurement. The values obtained from each load applied are analyzed using calculations, tables, and graphs in order to ensure accurate results. The analyzed results obtained from the two different circuit arrangement are compared so as to know the best circuit arrangement to achieve an improved power factor.
Read Full Paper Reference this paper Page 8-18


Teachers’ perspectives towards use of technology, the case of GeoGebra in teaching Mathematics in Kenya
Mukiri Irene Mwingirwa, Dr. Miheso Khakasa Marguerite, Dr. David Khatete

Abstract: This study looks at GeoGebra as a type of technology and assesses teachers’ perspective towards training and use of GeoGebra as a tool to enhance learning of mathematics. This paper is reporting the findings of a larger study that was conducted in Kajiado County in Kenya (Africa) on GeoGebra use in teaching Secondary School Mathematics. The study sought to relate teachers’ perceptions towards uptake of technology and the actual uptake of technology as indicated by the Diffusion Innovation Model. The findings after training sessions with the mathematics teachers showed that the mathematics teachers were willing to use GeoGebra in their classes. The teachers said that among all topics, they felt that Geometry was the most complicated to teach and that GeoGebra was a welcome solution to this problem. Teachers’ responses indicated that GeoGebra is useful for teaching and learning Mathematics and that it would help learners grasp concepts in Geometry.
Read Full Paper Reference this paper Page 19-24


The Model of Policy Implementation in the Prevention Street Children in Makassar
Sumardi

Abstract: This study aimed to identify the presence of street children in Makassar, prevention policy, implementation policy, identify factors supporting and inhibiting models handling policies and find alternative countermeasures to reach results that are more effective and efficient. This study used a qualitative descriptive case study models. From the analysis of the results, the idea that the implementation of policy models prevention of street children in Makassar is using several stages of implementation. In the implementation used four models approach namely: (1) the model based approach to social institutions or institutional based services, (2) , the model based approach to a family or family based services, (3) the model -based approach society or community based services, and (4) models semi based approach social institution or half -way house services.
Read Full Paper Reference this paper Page 25-32


The Effects of Work Stress and Compensation on the Employees’ Performance through Motivation and Job Satisfaction at the Private Life Insurance Companies in Jakarta, Indonesia
Andi Baharuddin Anwar, Haris Maupa, Muhammad Ali, Muhammad Ismail

Abstract: This study aims to analyze and determine the effect of work stress and compensation on employees’ performance through motivation and job satisfaction in Life Insurance Companies in Indonesia. The data was collected using a purposive sampling of the population. The number of respondents sampled were 260 respondents out of 928 employees who work in 10 private life insurance companies in Jakarta, Indonesia. The data was collected using questionnaires. This data were then estimated using statistical analysis so called Structural Equation Modeling (SEM) with the help of AMOS program. The study found inter alia that job stress has a significant negative effect on employee performance, while compensation has a significant positive effect on employee performance. However, using SEM analysis it was found that only compensation has significant positive effect on employee performance through motivation and job satisfaction. This suggests that to increase the work performance of the life insurance companies in Jakarta, it is a must for the company to give a greater attention on the compensation.
Read Full Paper Reference this paper Page 33-36


The Effects of Leadership Styles, Organizational Climate, Environmental Aspects and Organizational Commitment and Job Satisfaction on the Lectures’ Performance of Kopertis III in Jakarta
Andi Awaluddin Anwar, Haris Maupa, Siti Haerani, CEPI Pahlevi

Abstract: The education system can become in a better form if supported by qualified educators who have effective behavior. This is simply because this condition will facilitate educational institution in achieving its objectives. This study aims to examine and analyze the effects of leadership style, organizational climate and environmental aspects of the organization's commitment on the lecturers’ performance in Kopertis III (The Educational Institution of Private University) in Jakarta, Indonesia. The unit of analysis in this study are lecturers who have attained the certificate of educators and the professional allowance. This research was conducted at the private university in Jakarta. Data collection method used in this research is the study of literature, documentation, interviews, and questionnaires. The study population include lecturers of civil servants employed (DPK) and lecturer in private universities in Jakarta and has attained certificates of educators and professional allowances. The number of samples in this study was 200 people. The instruments used in data collection was a questionnaire. Measurement scale used is Likert scale with five components. Analysis tools used in testing the hypothesis is using SEM (Structural Equation Modeling) with the help of AMOS program. The results showed inter alia that the style of leadership, organizational climate and environmental aspects have positive effect on organizational commitment and job satisfaction. Organizational climate and environmental aspects were also found to have positive effect on the performance of lecturers. Organizational commitment and job satisfaction have positive influence on the performance of lecturers. On the other hand, the style of leadership does not have a significant effect on the performance of lecturers. These results indicate that the direct connection of eleven lines, there is a path that has no effect and H3-a hypothesis be rejected.
Read Full Paper Reference this paper Page 37-42



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