Academic Research Publishing Agency Press
International Journal of Research and Reviews in Applied Sciences
ISSN: 2076-734X, EISSN: 2076-7366

Volume 26, Issue 1(January, 2016)

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1. RADIANT HEATER DESIGN TO SIMULATE RE-ENTRY AERODYNAMIC HEATING
by M.Y. Abdollahzadeh Jamalabadi & M. Dousti
Abstract

Experimental simulation of heat transfer through the re-entry of space vehicles are in the interest field of areo-engineers. The purpose of the current study is to experimentally and numerically investigate the effect of thermal radiative heat sources (Quartz lamps) on thermal heating of a thin plate inside an open cavity. The enclosure is open on the sides and is cooled from the bottom wall. The top wall of the enclosure is acting as a thin plate. The heating elements are placed at a distance from the bottom wall inside the cavity. The effects of various factors, such as plate distance from the heat source, the heat source strength, and the thermal radiative emissivity on plate temperature distribution is measured and a correlation for the plate maximum temperature for a single lamp is presented. Using that correlation a method is presented to estimate the maximum temperature of a heated thin plate in an open cavity exposing an arbitrary heating lamps power and arrangement. Good agreements between the experimental and the estimated results are gained. To reduce the number of experiments a finite-volume code which solves the governing nonlinear differential equations (mass, momentum, energy of fluid, and energy of surface) based on Patankar’s SIMPLE method is developed and is benchmarked by experiments. By the code the length of uniform temperature region as a function of heat source number, plate distance from the heat sources, distance between heat sources, and the uniformity coefficient is calculated.

Source: International Journal of Research and Reviews in Applied Sciences
January 2016-- Vol. 26 Issue 1 -- 2016

2. THE EFFECTS OF GOVERNMENT SIZE ON INEQUALITY IN IRAN

by Mohammad Sadegh Alipour, Nader Hakimipoor, Assad Alahrezaee, Ayoub Faramarzi & Ashkan shabbak

Abstract

Inequality is the most important issue in economics that always has been considered by governments and policy makers. The main objective of this study is to examine the effects of government size on inequality such as income distribution and Gini coefficient. In this paper we have applied the total government expenditure - GDP ratio as a basic indicator of government size and also, Gini coefficient to assess the effects of government size on inequality. The methodology is based on vector auto regression (VAR) model. The results have shown that if government size, economic growth and inflation rate increase, the income distribution would be worsen in this period.  So, the government should transfer to private sectors and reduce its economic activity and pay attention more to governance and regulatory obligations.

Source: International Journal of Research and Reviews in Applied Sciences 
January 2016-- Vol. 26 Issue 1 -- 2016

3. COMBINATORIAL OPTIMIZATION OF DIRECT MODELING GREY FORECASTING MODEL FOR APPROXIMATE NON-HOMOGENEOUS EXPONENTIAL SEQUENCE
by Nian Tian & Yong We
Abstract

With respect to the optimization problems of the approximate non-homogeneous exponential sequence grey forecasting model, this paper establishes a new combinatorial optimization model which combines the three methods of using the before and after difference quotient to optimize grey derivative and comprehensive utilization of all known data to optimize initial conditions and direct modeling. It is proved that the model has the whitening index and the coefficient and the constant coincidence. Finally, the effectiveness and superiority of the model are verified by the cases, and the application scope and the reason for the better of the model are also analyzed.

Source: International Journal of Research and Reviews in Applied Sciences
January 2016-- Vol. 26 Issue 1 -- 2016

4. SIMPSON'S RULE AND ROMBERG INTEGRATION TO SOLVE LINEAR FREDHOLM INTEGRAL EQUATION WITH CONTINUOUS KERNEL

by A.M. Al-Bugami & S.S. Al-Juaid

Abstract

In this paper, we discussed  Simpson's Rule (S.R) and Romberg Integration (R.I) are used to solve linear Fredholm integral equation of the second kind with continuous kernel. We have implemented some examples using these methods and we had a numerical comparison of the results to prove the effectiveness of these methods in the solution of the integral equations.

Source: International Journal of Research and Reviews in Applied Sciences 
January 2016-- Vol. 26 Issue 1 -- 2016

5. ELECTRON DYNAMICS IN ACOUSTICALLY DRIVEN SEMICONDUCTOR SUPERLATTICES
by M.K. Awodele and A.O Awodugba
Abstract

Exploring single electron dynamics in semiconductor superlattices driven by an acoustic wave, the types of electron trajectories obtain depend on the strength of the wave amplitude. Two dynamical regimes that are obtained depend on the wave amplitude strength and the initial position of electrons in the acoustic wave. The frequency range of the oscillation produced can be as large as terahertz.

Source: International Journal of Research and Reviews in Applied Sciences
January 2016-- Vol. 26 Issue 1 -- 2016

6. INFORMATION TECHNOLOGY GOVERNANCE ROLE IN ENHANCING IT PORTFOLIO MANAGEMENT: A CASE STUDY ON SAUDI ARABIA PRIVATE SECTOR

by Waleed S. Afandi

Abstract

This research investigates the Saudi Private sector readiness to implement IT Governance concepts, so as to enhance IT Portfolio Management discipline   in Saudi Private sector organizations. We use in this this research Quantitative method for answering the research questions. Different types of statistical tools were implemented, such as SmartPLS 2.0 and SPSS, through a field survey of 10 organizations in Saudi Arabia Private Sector.  The first finding of the research shows that there is an existence of the relationship between IT Governance and its Pillars: accountability, transparency, participation, and predictability. The second finding of the research shows that there is an existence of the relationship between IT Portfolio Management and its Pillars: a Technique To Execute Organization Strategy (PMSE), Optimizing Resource Allocation across Projects (PMOS), Projectification of Business Strategy(PMPS),and Risk Balance (PMRB).The Third finding shows that there is a relationship between IT Governance and IT Portfolio Management.  This kind of research is very important for Saudi Arabia Private Sector to take benefits from implementation of the above concepts in order to enhance IT Portfolio Management discipline.

Source: International Journal of Research and Reviews in Applied Sciences 
January 2016-- Vol. 26 Issue 1 -- 2016













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