Journal title
http://jsci.khu.ac.ir
Quarterly Journal of Science Kharazmi University - Journal articles for year 2014, Volume 14, Number 2Yektaweb Collection - https://yektaweb.comen2014/7/10Forme
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1878&sid=1&slc_lang=en
1Formf
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1877&sid=1&slc_lang=en
1Classic and Bootstrap Tests for Equality of Means
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1649&sid=1&slc_lang=en
Traditional methods for testing equality of means are based on normality observations in each treatment, but parametric bootstrap methods offer a test statistic to estimate P-value by resampling. In article, first, Fisher, Cochran, Welch, James, Brown and Forsyth, Approximate F, Weerahandi, Adjust Welch and Parametric Bootstrap tests for testing hypothesis equality of means are defined. Then type one error and power of these tests were compared to each other by a simulation study for various sizes of samples and treatments. Finally sizes of these tests were calculated for the real data of Esfahan Cement factory. <br>Traditional methods for testing equality of means are based on normality observations in each treatment, but parametric bootstrap methods offer a test statistic to estimate P-value by resampling. In article, first, Fisher, Cochran, Welch, James, Brown and Forsyth, Approximate F, Weerahandi, Adjust Welch and Parametric Bootstrap tests for testing hypothesis equality of means are defined. Then type one error and power of these tests were compared to each other by a simulation study for various sizes of samples and treatments. Finally sizes of these tests were calculated for the real data of Esfahan Cement factory.Nasrollah IranpanahAnalysis of Split Bregman Method for Solving the Optimal Control Problem with Elliptic Partial Differential Equation Constraint
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1723&sid=1&slc_lang=en
In recent decades optimal control problems with partial differential equation constraints have been studied extensively. These issues are very complex and the numerical solution of such problems is of great importance. In this article we will discuss the solution of elliptic optimal control problem. First, by using the finite element method we obtain to gain the discrete form of the problem. The obtained discrete problem is actually a large scale constrained optimization problem. Solving this optimization problem with traditional methods is difficult and requires a lot of CPU time and memory. But split Bergman method converts the constrained problem to an unconstrained problem, and hence it saves time and memory requirement. We then use the split Bregman iterative methods for solving this problem, and examples show the speed and accuracy of split Bregman iterative methods for solving this type of problems. We also use the SQP method for solving the problem and compare with split Bregman method.Mahmoud Lotfi HonyandariDetermining the Optimal Complexity of Bipartite Access Structures
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1722&sid=1&slc_lang=en
Determining the Optimal Complexity of Bipartite Access Structures<br><br>Abbas Cneraghi <br><br>Abstract<br><br>Keywords: Complexity, Secret Sharing Scheme, Access structure.<br><br><br><br>In a bipartite secret sharing scheme, the set of participants is divided into two parts, and all participants in each part play an equivalent role. The ideal bipartite access structures were characterized by Padro and Saez, but it is not known which is the optimal information rate of non ideal bipartite access structures. Determining the optimal complexity of general access structures is one of the major problems in secret sharing. We study this open problem restricted to the bipartite access structures, obtaining a new method to compute bounds on the optimal complexity. Namely, by using the connection between secret sharing schemes and polymatroids, we show a linear programming problem that determines, for each access structure, a lower bound on the complexity. Moreover, we show new optimal constructions for certain bipartite access structures.Abbas CheraghiModelling of Spatial Extreme Values with Random Field and Copula Function
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1499&sid=1&slc_lang=en
In this article a spatial model is presented for extreme values with marginal generalized extreme value (GEV) distribution. The spatial model would be able to capture the multi-scale spatial dependencies. The small scale dependencies in this model is modeled by means of copula function and then in a hierarchical manner a random field is related to location parameters of marginal GEV distributions in order to account for large scale dependencies. Bayesian inference of presented model is accomplished by offered Markov chain Monte Carlo (MCMC) design, which consisted of Gibbs sampler, random walk Metropolis-Hastings and adaptive independence sampler algorithms. In proposed MCMC design the vector of location parameters is updated simultaneously based on devised multivariate proposal distribution. Also, we attain Bayesian spatial prediction by approximation of the predictive distribution. Finally, the estimation of model parameters and possibilities for capturing and separation of multi-scale spatial dependencies are investigated in a simulation example and analysis of wind speed extremes.Mohsen Mohammadzadeh DarrodiSynthesis and characterized porphyrin(TCPP) as an organic dye in dye-sensitized solar cells
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1835&sid=1&slc_lang=en
In this research an organic dye called Porphyrin, which showed TCPP in abbreviation form, synthesis. In order to characterized this dye UV-Vis absorptive spectrum was derived and compared with other articles samples. This dye was used to build a dye sensitized solar cell(DSSC), and after characterization of this cell the function of it was measured. Porphyrin absorption spectra obtained in this study is consistent with similar in iranian and international samples that Confirm the accuracy of the porphyrin and a high absorbtion intensity is achieved. A DSSC based TCPP have a good performance that open circuit voltage 0.49 v and short circiut current density 3.6 mA/cm2 and efficiency 0.7% has achieved.asghar hejazipourElectronic transport properties of a multi-molecular chain of copper phthalocyanine
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1846&sid=1&slc_lang=en
In this paper, we study the electronic transport of a multi-molecular chain of copper phthalocyanine connected to two metallic leads by using Greenâ€™s function method at the tight-binding approach. The results show that in the gaps of this system, the density of states is independent of the number of molecules or the system length. Moreover, increasing of the system length decreases the tunneling conductance and causes the appearance of peaks and dips in the gaps of the conductance spectra and depending on the value of incoming electron energy, the electron tunneling takes place easier, especially in the edges of the gaps.Hassan RabaniInvestigation of structure , electronic and optical properties of strontium sulfide (SrS) using pseudopotential method
http://c4i2016.khu.ac.ir/jsci/browse.php?a_id=1836&sid=1&slc_lang=en
In this paper the electronic ,structure and optical properties of strontium sulfide in rocksalt phase have been studied. The calculation have been performed using pseudopotential method in the framework of density functional theory (DFT) by Abinit package.in this calculation we used of localized density approximation(LDA) and generaliezed geradient (GGA) approximation. The obtained result have been good agreement with other theory and experimental results. <br>Keywords: charge disturibution, density of state, density functional theory, SrS.Keywords: charge disturibution, density of state, density functional theory, SrS.Keywords: charge disturibution, density of state, density functional theory, SrS.Keywords: charge disturibution, density of state, density functional theory, SrS.H Salehi