The Hamiltonian structure of the guiding-center Vlasov-Maxwell equations is presented in terms a functional and bracket. bracket, which shown to satisfy Jacobi identity exactly, used show that momentum angular-momentum conservation laws can also be expressed form.

this research aims at investigating the role of certain factors in organizational culture in the success of knowledge sharing. the research question asks which cultural factors affect knowledge sharing in r&d; center of petrochemical industry. research method used in research is survey. of the 190 survey packages sent out, 132 of the questionnaires returned. to analyze data we use spearman corr...

in this paper, we use the structure theory to prove an analog to a well-known theorem of herstein as follows: let r be a ring with center c such that for all x,y ? r either [x,y]= 0 or x-x [x,y]? c for some non negative integer n= n(x,y) dependingon x and y. then r is commutative.

In this paper, we use the structure theory to prove an analog to a well-known theorem of Herstein as follows: Let R be a ring with center C such that for all x,y ? R either [x,y]= 0 or x-x [x,y]? C for some non negative integer n= n(x,y) dependingon x and y. Then R is commutative.

In this paper, a novel method for ranking of fuzzy numbers are proposed. In this method, decision maker is defined based on the center of mass at some cuts of a pair of fuzzy numbers in discreet version and center of mass on all of cuts of a pair of fuzzy numbers in continuous version. Our method can rank more than two fuzzy numbers simultaneously. Also, some properties of methods are described...

here‎, ‎we aim to develop a new algorithm for solving a multiobjective linear programming problem‎. ‎the algorithm is to obtain a solution which approximately meets the decision maker's preferences‎. ‎it is proved that the proposed algorithm always converges to a weak efficient solution and at times converges to an efficient solution‎. ‎numerical examples and a simulation study are used to...

This study attempts to reveal the effect of family structure on social participation of  Payame Noor university students, it consists of 339 students. The theoretical framework of this investigation is based on two hypotheses. Hegen personality structure theory and Parsons action theory.  One hypotheses is on satisfactoriness in the family structure were based on personality structure theory an...