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

Volume 25, Issue 3(December, 2015)

To read and print the PDF files of the Journal Archive you will need to have Acrobat Reader 
 If you have any technical or content problems contact : publisher@arpapress.com

1. EFFECT OF THERMAL RADIATION ON NON-PREMIXED COMBUSTION OF AIR/METHANE MIXTURES IN VERTICAL POROUS CYLINDER
by M.Y. Abdollahzadeh Jamalabadi  & S. Dousti
Abstract

The present work is the numerical study of non-premixed combustion within a vertical porous cylinder using turbulence model with various angle of fuel injection with and without thermal radiation effects. In such a problem, two aspects need to be considered for a precise evaluation of the thermal radiation: the turbulence–radiation interactions, and the local variation of the radiative properties of the participating species, which are treated here with the weighted-sum-of-gray-gases model. The chemical reactions rates were considered as the minimum values between the Arrhenius and Eddy Break-Up rates. A two-step global reaction mechanism is used, while the turbulence modeling was considered via standard k–ɛ model. The source terms of the energy equation consisted of the heat generated in the chemical reaction rates as well as in the radiation exchanges. The discrete ordinates method is employed to solve the radiative transfer equation. Comparisons of simulations with/without radiation demonstrated that the temperature, the radiative heat source, and the wall heat flux were importantly affected by thermal radiation, while the influence on species concentrations proved to be negligible. The results show the importance of thermal radiation for an accurate prediction of the thermal behavior of a combustion chamber. The governing equations: continuity, axial momentum, radial momentum, turbulent kinetic energy, turbulent kinetic energy dissipation, energy, CH4, O2, CO2, CO and H2O mass fraction. The results show that CO2 is not a passive diluent and can also interact through radiative transfer and this radiation effect is very significant. In addition, an increase in angle of inlet gas enhances the mixing rate, peak temperature, and water and carbon dioxide volume fraction inside the middle region of the chamber. The locations of the maximum temperature and product concentration shift closer to the combustor inlet with increase in inlet angle.

 

Source: International Journal of Research and Reviews in Applied Sciences
December 2015-- Vol. 25 Issue 3 -- 2015

2. INFLUENCE OF THE PHYSIOCHEMICAL PROPERTIES OF MANIHOT ESCULENTA (CASSAVA) ON THE HYDROLYSIS AND FERMENTATION YIELDS

by Michael George, Gary Mendonca & Patrick Ketwaru

Abstract

The present study focuses on utilizing four local varieties of the starch rich tropical tuber, Manihot esculenta Cranz (cassava), for the production of ethanol. Each variety of cassava was characterized. Moisture content, starch granule size, and gelatinization data were obtained. The reaction parameters that were varied during hydrolysis of starch included acid type (sulfuric acid, nitric acid) and acid concentration (0.2 %, 0.5 %, 0.8 %, 25 %, and 35 % v/v). The concentration of reducing sugars present in the hydrolyzate was determined using the colorimetric Dinitrosalicyclic acid method (DNS) at 540 nm. Conditions that were varied during fermentation included fermentation time (16 to 24 hrs) and substrate concentration under constant temperature (32 °C) and pH (4.0) using Saccharomyces cerevisiae. There was a significant (p<0.05) difference among the other varieties and unclemac when 35 % sulfuric acid was used for hydrolysis. It was observed that a concentration of three quarters the original hydrolyzate concentration fermented for 24 hrs gave significantly different (p<0.05) results when compared to the other three varieties (butterstick, rusta and brancha). This study also successfully outlined the significant influence of granule size and gelatinization temperature on the hydrolysis yield of sugars from the cassava varieties. This study provides a comprehensive characterization of raw material and optimization of reaction parameters for ethanol production from a cheap, readily available, and renewable source of sugar found in Guyana.

Source: International Journal of Research and Reviews in Applied Sciences 
December 2015-- Vol. 25 Issue 3 -- 2015

3. THE EFECTS OF THE SECOND-HAND CAR MARKET ON THE FIRM’S DYNAMIC PRICING AND NEW PRODUCT INTRODUCTION STRATEGIE
by Yanyan He & Kefeng Ai
Abstract

In  recent  years, as  China’s  rapid  economic  development, the automobile  consumption  has  been  developing rapidly, including the used car distribution industry, which is growing  rapidly at double-digit rates no matter from the number of  transactions, or  the  transaction amount. Data shows that  in the early 21st century, China’s second-hand car circulation industry has stepped into a golden era of high speed and sustainable development. As the development prospects  of  the secondary markets are so widely that many luxury car manufactures are all beginning to sell their own second-hand products, at the same time, as the secondary market may influence the new car market essentially,  it’s becoming much more important for the manufactures to develop a scientific and reasonable pricing strategy and the introduction of new products. Therefore this article try to study the influence of these second-hand car markets make on the auto industries’ dynamic pricing and the new product strategy, and it has important significance.

Through the establishment of a two-cycle dynamic supply chain model, the  article try to analysis the consumers’ strategy selection under the conditions of whether the used car markets exist and the car manufacturers’ corresponding selecting  behavior, in order to make a clear direction for the automotive industries’ further development.
Source: International Journal of Research and Reviews in Applied Sciences
December 2015-- Vol. 25 Issue 3 -- 2015

4. THE EXPANSION METHOD TO WORK OUT EXACT SOLUTIONS OF THE (2+1) DIMENSIONAL ASYMMETRICAL NIZHNIK-NOVIKOV-VESELOV SYSTEM

by ZeJian Cui & Jiao Zeng

Abstract

Solving the nonlinear evolution equations has very important position, now there are many effective ways for explicit exact solutions of nonlinear evolution equations. This paper introduces the (2+1) dimensional asymmetrical Nizhnik-Novikov-Veselov system. Enrich the (2 + 1) -dimensional ANNV system solutions.

Source: International Journal of Research and Reviews in Applied Sciences 
December 2015-- Vol. 25 Issue 3 -- 2015

5. THE MEASUREMENT OF THE DIELECTRIC CONSTANT OF THREE DIFFERENT SHAPES OF CONCRETE BLOCKS
by David McGraw Jr.
Abstract

To optimize the effectiveness of the rehabilitation of underground utilities, taking in consideration limitation of available resources, there is a need for a cost effective and efficient sensing systems capable of providing effective, in real time and in situ, measurement of infrastructural characteristics. To carry out accurate non-destructive condition assessment of buried and above ground infrastructure such as sewers, bridges, pavements and dams, advanced ultra-wideband (UWB) based radar was developed at Louisiana Tech University (LTU). One of the major issues in designing the FCC compliant UWB radar was the contribution of the pipe wall, presence of complex soil types and moderate-to-high moisture levels on penetration depth of the electromagnetic (EM) energy.

The electrical properties of the materials involved in designing the UWB radar exhibit a significant variation as a result of the moisture content, mineral content, bulk density, temperature and frequency of the electromagnetic signal propagating through it. In this paper, the dielectric constant of concrete blocks is measured over a microwave frequency range from 1 Ghz to 18 Ghz including the effects of moisture and chloride content. A high performance software package called MU-EPSLNTM was used for the calculations. Data reduction routines to calculate the complex permeability and permittivity of materials as well as other parameters are also provided.  The results obtained in this work will be used to improve the accuracy of the numerical simulations and the performances of the UWB radar system.
Source: International Journal of Research and Reviews in Applied Sciences
December 2015-- Vol. 25 Issue 3 -- 2015

6. ELECTRIC FIELD EFFECT ON THE ACOUSTICALLY DRIVEN SEMICONDUCTOR SUPERLATTICES

by M. Kofoworola Awodele, Fedor V. Kusmartsev & Alexander G. Balanov

Abstract

We study the effect of applying a static electric field to the acoustically driven semiconductor superlattices. Semiconductor superlattices have a large effective lattice period of ~ 1-10 nanometres. When an electric field is applied along its axis the electron starts to oscillate. The frequency range of this oscillation can be as large as terahertz. The oscillation causes localisation of electron trajectories as the field increases. It had also been shown that electron oscillations are induced in superlattices when acoustic wave is applied. The electron oscillations depend critically on the acoustic wave amplitude, whether it is less or greater than the critical value.

In this work, when both the acoustic wave and electric field were applied together, we obtained the peak drift velocity significantly higher compared to when the acoustic wave amplitude or electric field was applied alone. We analysed numerically computed electron trajectories for different values of the acoustic wave amplitude and the electric field applied imparting the high drift velocity.

Source: International Journal of Research and Reviews in Applied Sciences 
December 2015-- Vol. 25 Issue 3 -- 2015

7. FAILURE OF THE LIKELIHOOD RATIO METHOD: THE DISCRETE ARITHMETIC ASIAN CALL OPTION CAS

by Werner Hürlimann

Abstract

. 

Based on approximate analytical lower and upper bounds for the discrete arithmetic Asian call option vega, it is shown that this sensitivity cannot be obtained through application of the Monte Carlo likelihood ratio method. A discussion of alternative simulation methods is also included.

Source: International Journal of Research and Reviews in Applied Sciences 
December 2015-- Vol. 25 Issue 3 -- 2015













Academic Research Publishing Agency Press