Showing papers in "Asian Journal of Current Engineering and Maths in 2013"

Students’ Use of Social Media in Higher Education in Ghana

Abstract: This study examined social media use among university students. An online survey was administered to a random sample of 311 sandwich students in the University of Education, Winneba in the 2012/13 academic year. The results revealed that majority of the students were aware of and use social media for a variety of reasons which included: connecting with old friends and family members, finding new friends, obtaining or sharing learning materials, receiving update of events, posting information and whiling away time. It was also found that students had concerns about joining or using social media which included concerns about personal privacy, limited computing skills, cost of Internet connectivity and time to use social media. The results of the study also indicated that students had positive views about the academic use of social media. Students believed that: it will be fun for their lecturers to use social media, their grades will be better if they could contact lecturers through social media and lecturers should hold some lecture hours on social media. Keywords: Social Media, Higher Education, Academic use of social media, Concerns about using social media

πgr-CLOSED SETS IN TOPOLOGICAL SPACES

Abstract: The aim of this paper is to introduce a new class of sets called πgr-closed sets in topological spaces and to study their properties. Further , we define and study πgr-continuity, πgr-irresolute maps and πgr-T 1/2 -Space. Mathematics Subject Classification : 54A05

On Semi*- Closed Sets

Abstract: In this paper we introduce a new class of sets, namely semi*-closed sets We give characterizations for semi*-closed sets We define the semi*-closure, semi*-limit points and semi*-derived set of a subset Further we investigate fundamental properties of semi*-closed sets

Solving transportation problem with the various method of linear programming problem

Abstract: The Transportation Problem is one of the subclass of linear programming problem which the objective is to minimize transportation cost of goods transport to various origins to different destinations. In this paper we are representing the transportation problem for Albert David Company to reduce transportation cost, its working with 3 plants and 14 depots in all over India. In [6][7] we are solve the transportation problem with the help of dual simplex and two phase method. Here we are solving this problem with the help of Dual simplex method, Two Phase method and Big M Method by using Tora software and we are comparing the obtained optimal solution with Vogel Approximation Method.

The contribution of urban green spaces in the regulation of the microclimate and the improvement of the air quality in cities

Abstract: Urban concentration and urban sprawl have important consequences on the environment. The anarchic sprawl of cities without green spaces, especially those of developing countries, is a true ecological threat to urban dwellers. The gradual change of microclimate in a large city is primarily related to the scarcity of green spaces. The main objective of this study is to assess the role of urban green spaces in alleviating the adverse effects of urbanization. The study is based on a 4 year series of measurements of the influence of the green spaces in Paris (France) on climatic factors and air pollution patterns. The analysis of these measurement samples revealed that green spaces enable the regulation of temperatures and the rate of significant pollution. The results of the study based on measurements, which represent the most frequent cases found during the campaign, indicate that urban green areas play an important role in improving the quality of the urban environment. The decreasing temperatures in green spaces promote the reduction of the urban heat island. Green spaces are the least polluted places in a city. They contribute significantly to the improvement of the microclimate and the reduction of the rate of pollution in the city.

Q-homotopy analysis method and application to fingero-imbibition phenomena in double phase flow through porous media

Abstract: It is well known that Homotopy Analysis Method is one of the most efficient methods of obtaining analytical or approximate solution of both linear and nonlinear partial differential equation. A more general form of HAM is introduced in this work called q-HAM which gives more chances of convergence compare to the usual HAM due to the presence of fraction factor associated with the solution. An application of this method is given to Fingero-Imbibition phenomena in double phase flow through porous media. q-HAM is used to obtain the saturation of injected water. We obtain the graphical representation of solution using MATLAB R2007b and Microsoft Excel 2010 with different values of h and n testing the effect of large n. Comparison is made with the solution obtained in [10] using Adomian Decomposition Method when n = 1 including numerical values.

Min- max zero sum two persons continuous differential game with fuzzy controls

Abstract: In this paper, we will discuss the problem of min- max zero sum two persons fuzzy continuous differential game with fuzzy controls and its membership is a non linear function. The necessary and sufficient conditions for this problem are derived. Finally, numerical example is presented to verify the results.

On humbert matrix polynomials

Abstract: The main aim of this paper is to define and study the Humbert matrix polynomials. An explicit representation, differential recurrence relations and a three-term matrix recurrence relation for the Humbert matrix polynomials are given. The hypergeometric matrix representations are established and expansion of the Humbert matrix polynomials as series of Hermite matrix polynomials are obtained. 2010 Mathematics Subject Classification: 15A60, 33C05, 42C05, 33C45, 33C50, 33E20.

Thermal diffusion and chemical reaction effects on unsteady mhd free convection flow past a semi infinite vertical permeable moving plate

Abstract: The present work analyzes the influence of a first-order homgeneous chemical reaction and thermal radiaton on hydromagnetic free convection heat and mass transfer for a viscous fluid in the presence of thermal diffusion and heat generation. The plate is assumed to moves with a constant velocity in the direction of the flow. A uniform magnetic field acts perpendicular to the porous surface which absorbs the fluid with a suction velocity varying with time. The dimensionless governing equations for this investigation are solved analytically using two terms harmonic and non-harmonic functions .The effects of various parameters on the velocity, temperature and concentration fields are presented graphically and discussed.

INTUITIONISTIC FUZZY π - GENERALIZED SEMI PRE CLOSED SETS

Abstract: The purpose of this paper is to introduce and study the concepts of intuitionistic fuzzy π-generalized semi-pre closed sets and intuitionistic fuzzy π-generalized semi-pre open sets in Intuitionistic fuzzy topological space. We investigate some of their properties

Complete synchronization, anti-synchronization and hybrid synchronization of two identical parabolic restricted three body problem

Abstract: In this paper , we have investigated complete synchronization, anti-synchronization and all possible cases of hybrid synchronization of two identical non-linear dynamical systems of a parabolic restricted three body problem evolving from different initial conditions using the Active Control Technique based on Lyapunov Stability theory and the Routh-Hurwitz criterion. These cases lead to establishing that the synchronization behavior of the two identical parabolic restricted three body problem depends only on the synchronization behavior of the state variable 'z', which gives the position of the negligible third body mass. Finally, numerical simulations are performed to plot phase portraits, time series analysis graphs of the master system and the slave system which further illustrate the effectiveness of the proposed control techniques.

Unbalanced fuzzy transportation problem with roubast ranking technique

Abstract: The aim of Fuzzy transportation is to find the least transportation cost of some commodities through a capacitated network when the supply and demand of nodes and the capacity and cost of edges are represented as fuzzy numbers. Many previous papers 6,7,12,13 have presented arithmetic operations, alpha level and simple ranking by operations. P. Pandian11 has presented some methods for fuzzy transportation problem. Finally all these research papers present the solutions of balanced FTP by alpha level, simple ranking methods and simple arithmetic operations.In this paper we proposed a ranking method to find the fuzzy optimal solution of unbalanced fuzzy transportation problems occurring in real life situations. Also, a new representation of trapezoidal fuzzy numbers is proposed. The advantages of the proposed methods over existing methods and the proposed representation of trapezoidal fuzzy numbers over existing representation are also discussed.

Bayes estimation of weibull length biased distribution

Abstract: A sequence of independent life time data X 1 , X 2 ,.... , where observed from Weibull length biased (WLB) distribution with probability density function WLB θ 1 ), but later it was found that there was a change in the system at some point m and it is reflected in the sequence after by change in probability density function WLB θ 2 ). The Bayes estimators of m, θ 1, θ 2 , are derived under different asymmetric loss functions. The effects of correct and wrong prior information on the Bayes estimates are studied.

Radiation and chemical reaction effects on mhd heat and mass transfer flow inclined porous heated plate

Abstract: In this analysis, the effects of chemical reaction and radiation absorption have been discussed on unsteady MHD free convection heat and mass transfer flow on a viscous, incompressible, electrically conducting fluid past a semi-infinite inclined porous plate, moving with a uniform velocity. The chemical reaction has been assumed to be of first-order. The non-linear partial differential equations governing the flow have been solved numerically using a closed analytical form method under the convergence criteria. Graphical results for velocity, temperature and concentration profiles have been obtained, to show the effects of different parameters entering in the problem. Such flow problems are important in many processes, in which there is combined heat and mass transfer with chemical reaction, such as drying, evaporation at the surface of water body etc. It has been observed that the concentration decrease with the increase in the chemical reaction parameter and there is an increase in temperature with an increase in the value of radiation parameter.

µ-LOCALLY CLOSED SETS AND µ LC - FUNCTIONS

Abstract: In this paper, we introduce -locally closed sets and different notions of generalization of continuous functions, namely LC-continuity, LC*-continuity, LC**-continuity, LC-irresoluteness, LC*-irresoluteness and LC**-irresoluteness are introduced for topological spaces along with some of their characterizations and some inter relationships. 2010 Mathematics Subject code Classification : 54A05, 54C10

Magnetic field and hall current effect on mhd free convection flow past a vertical rotating flat plate

Abstract: In this study, effects of Hall current and rotation on an electrically conducting rarefied gas are investigated. A constant, strong magnetic field is applied at an angle to both the electric field and the direction of flow of the fluid. The study seeks to find the effects of Hall current and angle of application of the magnetic field on velocity and temperature profiles. The flow of the gas is considered as unsteady and restricted to laminar domain. The set of equations which describe the flow are a combination of the Navier-Stokes equations of fluid dynamics, generalized Ohm’s law, Maxwell’s equations, equation of continuity and equation of energy. These equations are solved numerically using the finite difference method. Numerical results of velocity and temperature profiles are analyzed using tables and graphs for Hall current parameters m* ranging from 0.0 to 1.0 and parameter for angle of application of the magnetic field ranging from 0.0 to 1.0. Mathematics Subject Classification:

Some new class of nearly closed and open sets

Abstract: The notions of pre*- closed, pre*-open sets and pre*-closure, pre*-interior of a subset in topological spaces are introduced in this paper. Their connections with other existing concepts such as pre-closed, semi-closed, α-closed etc. are investigated. MSC 2010: 54A05.

1 2 - q* - continuous maps in bitopological spaces

Abstract: We introduce a new type of functions called t 1 t 2 - Q * - continuous maps , t 1 t 2 - Q * - irresolute and t 1 t 2 - Q * - Contra continuous map . We obtain several characterizations of this function and study its bitopological properties. 2000 Mathematics Subject Classification : 54E55

Common fixed points of compatible mappings of type (c)

Abstract: In this paper we prove a common fixed point theorem by considering two pairs of compatible mappings of type (C). Our result modifies and extends the results of Bijendra and Chouhan[1] and Koireng et. al . [4]. 2000 AMS Classification : 47H10, 54H25.

Stability and geometrical interpretation of reciprocal type functional equation

Abstract: In this paper, we investigate the generalized Hyers-Ulam stability of reciprocal type functional equation (0.1) where is a mapping with is the space of non-zero real numbers, and for all We also illustrate geometrical interpretation of the functional equation (0.1).

Radiation effect on mhd free convection flow of kuvshinshiki fluid with mass transfer past a vertical porous plate through porous medium

Abstract: The objective of this paper is to study the radiation effect of Kuvshinshiki fluid on MHD free convection flow past a vertical porous plate with heat and mass transfer taking Visco-elastic and Darcy resistance terms into account and the constant permeability of the medium numerically and neglecting induced magnetic field in comparison to applied magnetic field. The velocity, temperature and concentration distributions are derived, discussed numerically. It is observed that velocity increases with increase in Gm, K and but it decreases with the increase in M andλ . It is observed that increase in Prandtl number Pr causes decreases in temperature. It is observed that increase in Schmidt number Sc leads to decreases in concentration. It is also noticed that skin friction increases with increase in K and but it decreases with the increase in R, M andλ.

Statistical modeling of climate parameters

Abstract: Climate variations more or less decide the environmental dynamics of an area. Extreme changes of climatic conditions cause problems in anywhere, especially to the agricultural sector. In this respect, knowledge of the likely climate and its impact could add value to Agro-environmental management. In this study, a forecasting approach that incorporates climatic variability is presented. Using meteorological data collected, the time series model: Auto Regressive Integrated Moving Average (ARIMA) is applied to estimate future variation in meteorological parameters. The parameter of each model is estimated with the time series module of software SPSS. The annual rainfall, temperature, relative humidity is forecasted with the observed data.

Minimal gs-open sets and maximal gs-closed sets.

Abstract: The object of the present paper is to study the notions of minimal gs-closed set, maximal gs-open set, minimal gs-open set and maximal gs-closed set and their basic properties are studied

A class of hypergeometric generalizations of an integral of srinivasa ramanujan

Abstract: The main aim of this paper is to develop some interesting applications, extensions and generalizations of Ramanujan's integral (which he obtained with the help of the celebrated Ramanujan Master theorem). Motivated essentially by some recent works by M. Garg and S. Mittal (see for example, [South East Asian J. Math. Math. Sc., 1(2) (2003), 85-95; Proc. Indian Acad. Sci. (Math. Sci.), 114(2) (2004), 99-101; Kyungpook Math. J., 44 (2004), 473-479]) and H. M. Srivastava et al. (see for example, [Rev. Roumaine Phys., 32 (1987), 685-692; Advanced Studies in Contemporary Mathematics, 18(2) (2009), 113-125]), we evaluate several general families of new definite integrals involving functions of one and more complex variables, some of which are then applied to derive the corresponding results associated with generalized Gaussian hypergeometric function qpF and the Fox-Wright generalized hypergeometric functions .

Slip effects on peristaltic motion of a williamson fluid through a porous medium in a planar channel

Abstract: In this paper, we studied the effect of slip on the peristaltic flow of a Williamson fluid through a porous medium in a planar channel, under the assumptions of low Reynolds number and long wavelength. The flow is investigated in a wave frame of reference moving with velocity of the wave. The perturbation series in the Weissenberg number ( ) was used to obtain explicit forms for velocity field, pressure gradient per one wavelength. The effects of various pertinent parameters on the pressure gradient and pumping characteristics are discussed through graphs in detail.

Connectedness in fuzzy čech closure spaces

Abstract: The aim of this paper is to study the concept of connectedness in fuzzy Cech closure spaces and establish the relation between the connectedness in fuzzy Cech closure spaces with its associated fuzzy topological spaces. Mathematical Subject Classification: 54A40

Fuzzy ideals and filters of lattices

Abstract: A complete lattice satisfying the infinite meet distributive law is called a frame In this paper we introduce the notions of L-fuzzy ideal and filter of a given lattice X where L is given frame and discuss the structure of these by proving that these form algebraic systems Also, we discuss various properties of Lfuzzy ideals and filters

A methodology for the choice of the best fitting continuous-time stochastic models of crude oil price the case of iran))

Abstract: This study, it has been attempted to select the best continuous- time stochastic model, in order to describe and forecast the oil price of Iran, by information and statistics about oil price that has been available for oil price in the past. For this purpose, method of The Maximum Likelihood Estimation is implemented for estimation of the parameters of continuous-time stochastic processes. The result of unit root test with a structural break, reveals that time series of the crude oil price is a stationary series. The simulation of continuous-time stochastic processes and the mean square error between the simulated prices and the market ones shows that the Geometric Brownian Motion is the best model for the Iranian crude oil price.

On decomposition of regular generalized continuity in supra topological spaces

Abstract: The aim of this paper is to introduce and investigate a new decomposition called supra regular generalized locally closed sets and a new decomposition of continuous maps called supra regular generalized locally continuous maps. Furthermore, we obtain several properties of the new notions.

Fixed head short term hydro thermal generation scheduling using differential evolution

Abstract: The short term hydrothermal scheduling (STHTS), is a daily planning proposition in power system operation. The main purpose of hydro thermal generation scheduling is to minimize the overall operation cost and to satisfy the given constraints by scheduling optimally the power outputs of all hydro and thermal units under study periods, given electrical load and limited water resource. In this paper differential evolution (DE) based algorithm is proposed, implemented and compared with real variable genetic algorithm (RVGA) for solving the hydrothermal scheduling problem considering valve point loading for fixed head hydro-thermal problem. Also, hydro power input-output model with constant head has been developed for Sewa hydro electric power plant by using the curve fitting technique namely least square method. The control parameters of real-variable genetic algorithm and differential evolution have been optimized for the considered case study. From the simulation results, it is found that the DE based approach is able to provide a higher quality solution at a comparatively lesser computational effort.