Journal of Operational Research in its Applications
Year:2009 | Volume:6 | Issue:20|Papers Count:10

In this paper, we want to introduce power series with functional coefficients and present facts about convergence and differentiation of them, also study about the application of this kind of series in the PDE’s solutions with initial conditions.

In this paper we use Adomian decomposition method (ADM) and Homotopy perturbation method (HPM) to comput the exact value of Beta function. Also Comparisons are made between these methods. Some computational results and examples are provided to illustrate the simplicity and reliability of the new proposed methods.

The goal of present work is the study of two dimensional steady state heat transfer inorder to introduce a numerical method based on finite difference methode for solving some Industrial problems.In this method a suitable mesh consisting of square elements should be applied to the selected region, and then initial temperatures of nod points are guessed using interpolation techniques. Using relaxation operator, the guessed temperatures are corrected in an iterative procedure to minimize the total sum of nods temperatures. In this work, first a mesh with square shaped elements is applied to the region and then to increase the precision of calculations, mesh elements are replaced with 45 degree rotated ones. Using this technique makes it possible to use previous data points and decrease calculations time.

However, much study done for measurement of Job Satisfaction, but in these studies often Job Satisfaction gauges by specific opinions specify and inadequacy Mathematics and statistics models about measurement Linguistic variable like emotion and witting. in present research design:For measurement, gauges and yardsticks job satisfaction, using synthetic paradigm. That this paradigm use Hertzberg's two factor theory, Maslow's need hierarchy and Specters's job satisfaction scale.Job Satisfaction gauges and rudimentary variables are categorize and calculated for each importantly yardsticks measure of importance and measure of satisfaction.With utilize Mamdani fuzzy inference system method and triangular membership function at the Matlab software, create and suggest three Phase models for analysis dimensions, components and gauges Professors' job satisfaction. 

In this paper, a method is suggested to rank the fuzzy decision making units (DMUs). By combining the results of fuzzy data envelopment analysis (DEA) and AHP method, and using the a-cut notion, an integrated fuzzy model is proposed which for various values of a, the fuzzy data are converted to crisp values and the pairwise comparison matrix is developed. Hence, various values of a, result different ranks and the best alternative can be selected.

In this paper, in the first method, separation of anomaly values have been performed by means of classical statistics, the tables of frequency distribution of Uranium and Thorium have been designed, and then the frequency distribution histograms that are introducer of distribution and dispersion of Uranium and Thorium have been plotted. After plotting frequency distribution histograms, the statistical parameters of these elements have estimated. Then separation of anomaly value has done on the base of dispersion around the average. In the fractal method separation have done by use of concentration- area curves. At the end introduction of anomaly maps and separation of anomaly values and background have been prepared on the base of calculations of classical statistics and fractal methods.

In this paper we have studied theoretically the structural and electronic  properties of PbTiO3 in tetragonal phases. In this work we have used full potential linearized augmented plane waves in the framework of density functional theory and by local density approximation (LDA), generalized gradient approximation (GGA) , Engle Vosko (EVA) and GGA+U. The results of calculations for tetragonal phases of PbTiO3 show that there is a direct band gap in X direction in the first brillouin zone. The results of calculation for LDA , GGA and EV method give the band gap about 2-2.3 eV that it is not in agreement with experimental results but by the GGA+U we have calculated band gap about 3.5 eV which is in excellent agreement with experiment. Electronic density around each atom (Ti, Pb and O) have been calculated.

Fully integrated voltage-controlled oscillator (VCO) is one of the most important blocks in the implementation of a single chip in today's wireless communication system. In this paper design and analysis of the ultra wideband and low phase noise linear LC VCO with low current consumption is presented. The MOS varactor is used to realize a wide tuning range. The phase noise level of the VCO is  -117.381 dBc/Hz at 1MHz offset and -127.2 dBc/Hz at 3 MHz offset. The Kvco ratio is about 1.24 GHz/V. The proposed topology gives a linear wide tuning range from 4.29 GHz to 5.29 GHz. Considering a 3.2V supply voltage the DC current consumption is about 3.13 mA and FOM of the proposed VCO is -187.5. This is the significant advantage of this circuit over previous works.