to study the effect of different fertilizing systems on macro and micro nutrients uptake by annual medic (medicago scutellata cv. robinson) an experiment was conducted under dry farming and irrigated conditions at two research stations (sararood dryland agricultural research institute and soil fertility research station in mahidasht) during 2009 growing season. the experimental treatments consi...

As a culture-based phenomenon which involves both linguistic and social aspects, translation has been investigated from various perspectives. The present Critical Discourse Analysis (CDA)-based study is an attempt to probe into the manipulation of ideologies in translations of political texts. A CDA approach, based on Fairclough (1989), Van Dijk (2004) and Farahzad (2007), was adopted to conduc...

Planning and learning at multiple levels of tempo ral abstraction is a key problem for arti cial intelli gence In this paper we summarize an approach to this problem based on the mathematical framework of Markov decision processes and reinforcement learn ing Conventional model based reinforcement learning uses primitive actions that last one time step and that can be modeled independently of th...

Chemistry knowledge can be represented at macro-, microand symbolic levels, and learning a chemistry topic requires students to engage in multiple representational activities. This study focused on scaffolding for inter-level connection-making in learning chemistry knowledge with graphical simulations. We also tested whether different sequences of representational activities produced different ...

We present a T E X macro package for generating the arabic writing from a standardized ASCII input notation. It can handle partial or full vocalization, and generates automatically most of the common ligatures. There is limited support for Farsi, Urdu, and Pashto. ArabT E X is compatible with Plain T E X and also most L a T E X environments; arabic and other material can be mixed freely. For sp...