A two-phase closed thermosyphon is a gravity assisted wickless heat pipe. The condenser section is located above the evaporator, so that condensat is returned by gravity. In this project a two phase closed thermosyphon was designed and manufactured. An experimental investigation was performed in order to observe the effect of the inclination angle on the transport behaviour of a closed thermosyphon was performed in order to observe the effect of the inclination angle on the was used; this was electrically heated at the lower part ("heating zone") and it was cooled by air along the upper part ("cooling zone"). Between these two aneas there was the well insulated "Transport zone". As working fluid water was used the heating zone was always flooded. The electric heat input and the inclination angle F toward the vertical position were varied in steps. The maximum heat flow rate in the tube proved tobe dependent upon the inclination. With a largest value of Qmax=23w at 70-90 degree. An effective thermal conductivity keff of the thermosyphon can be determined depending strongly on inclination and heat flow rate so the steeper the tube value the larger the heat flow rate the higher is the effective conductivity. The condensations in the cooling zone exhibits the largest transport resistance. The heat transfer with boiling in the heating zone shows large local differences which depends on inclination.

The purpose of this article is to design an intelligent tutoring system. The learning model of the proposed system includes features of academic self-efficacy and learning style. Academic self-efficacy has been automatically identified by designing of a fuzzy system based on learners' behavior and learning style through the questionnaire of Felder-Silverman which contains 44 question. After identification of these features, Proportional education strategies are presented and implemented in tutoring system in a real environment. The effectiveness of the proposed tutoring system is evaluated in terms of learners' operation by investigation of their satisfaction from system. The results show that considering functional characteristics in learning model, presenting some learning objects and proportional recommendations to the characteristics, results in 75% learners' educational progress and their educational satisfaction. Moreover, evaluation of the time passed in the e-Learning environment before and after using Perles doesn’ t show a significant difference. Results show that the designed intelligent tutoring system based on the learner model and educational strategies, has led not only to the educational success of the learners but also to increase in their enthusiasm in using the system. Considering other effective and cognitive features in learning is highly recommended inorder to provide a personalized environment.

Background and Objective: The urban location with the use of GIS in urban planning is very important. Commercial usage is one the most important urban usage wich affects other urban activities. It is worth noting that people are actively deal with space and always with the business and related information. Individual placement in a convenient location from an environmental perspective and getting it by all senses will be able to actively respond to the environment and it will draw the attention to the environment. Due to the remoteness of the hospitals, railway stations and close to natural areas such as parks, subjective factors such as the appearance of intimacy, originality and vitality affected and will affect the ability to invite people. Method: In this regard, appropriate measures to study the documents formulation and using the AHP model value of each criterion, relative to other criteria determined and to each of the relevant criteria weights. Finally, the resulting weights in layers of criteria and multiplication using fuzzy compounds layers were combined. Results: Integrated data showed that the 2 with more favorable situation than the 1 and the area as well as with situation better than 3 areas with different importance is the best place to create trade center. Conclusion: Region 17 of Tehran withpopulation of more than 358 thousands suffers from adequate access to 3 district municipality and this matter makes the costs of access to urban services increase. Therefore, this study explains appropriate indicators and geographic information systems to locate suitable commercial places in the region in each explained municipal areas which have been chosen for the establishment.