In a special class of globally hyperbolic, topologically trivial, asymptotically flat at spatial infinity spacetimes selected by the requirement of absence of supertranslations (compatible with Christodoulou-Klainermann spacetimes) it is possible to define the rest-frame instant form of ADM canonical gravity by using Dirac’s strategy of adding ten extra variables at spatial infinity and ten ext...

In this paper, the authors propose a new approach to fully asynchronous P systems, and a matching complexity measure, both inspired from the field of distributed algorithms. The authors validate the proposed approach by implementing several well-known distributed depth-first search (DFS) and breadth-first search (BFS) algorithms. Empirical results show that the proposed P algorithms have shorte...

We describe how the provision of a persistent programming environment together with a language that supports first class procedures may be used to provide the semantic features of other object modelling languages. In particular the effects of information hiding, data protection and separate compilation are provided and a comparison of the method with more traditional techniques is examined.

In this paper we deal with several classes of simple games; the first class is the one of ordered simple games (i.e. they admit of a complete desirability relation). The second class consists of all zero-sum games in the first one. First of all we introduce a "natural" partial order on both classes respectively and prove that this order relation admits a rank function. Also the first class turn...

a total of 260709 monthly test day milk records of 30903 first lactation holstein cows was used to determine the best function to describe the lactation curve. the records were obtained from first lactation holstein of 216 herds from 1988 to 2006 in khorasan province. the functions used in current study were wood’s incomplete gamma function, ali and schaeffer function, and legendre function of ...

Previous research has identified the nominal group as the most distinctive feature of the research article title. In contrast, the findings reported in this paper suggest Theme/Rheme is the dominant structure in title text. Theme/Rheme structures order and tie nominal groups in titles. When a title starts with a methodological term the first position nominal group acts as a theme marker. Thus, ...

Introduction. quality improvement in education is one of the aims of "3rd Five-year program of development" and Iranian Medical Educational Research & Development Centers (EDC) are founded for this reason. So it is obvious that, in our universities, this policy should be performed by these centers. This study was done, because there wasn't regular data collection system previously in order to e...