منیره رحیمی

In this research, the effectiveness of six different study methods in learning chemistry has been investigated. The statistical sample investigated in this research was 52 students of the 12th grade of experimental and mathematical fields from one of the high schools in the 8th district of Tehran. The questions of this research were prepared in the form of a multiple-choice questionnaire, which was given to the students, and then the results were evaluated by analytical-descriptive methods. In order to ensure the efficiency of these six methods in chemistry tests, the students were asked to participate first in a descriptive test and then in a standard four-choice test with average level of questions. According to the general results obtained during this research, it was found that pre-reading and post-reading of course materials, as well as continuous but short-term study during the week, has a significant effect on improving the learning of the chemistry course and also the desired performance of the students in the tests of this course.

Using passive defence indices, this paper presents a location finding for a site or a new village that could be employed for the habitation of the local people and the services or facilities that further encourages habitation in Bastak, a part of Hormozgan Provine. To achieve this goal, the strong and accurate GIS, along with Ahp model have been used to analyze the maps. Passive defence is a collection of strategies, plans and ventures that reduces vulnerability against threats. This notion is sometimes referred to as Prevention. Regarding present situation of the country, security and defence measures are the first priority and observing principles of passive defence seems to be a major part of the sustainable development. According to the aim of this study, different layers of data including human and natural factors have been incorporated to give maps the ability to sketch various potentialities of the region. Finally all the maps have been weighed and integrated to constitute one single whole which exhibits plains and optimized points for the erection of a new village. To name a few of natural factors used in this paper we can refer to topography, geology, land potentiality, river, fault, point of view, slope of the region etc. Of human factors the following can be mentioned: rural points, urban points, communicative lines and population of the region.

To select stable bread wheat cultivars/lines and suitable sowing date for moderate agro-climate zone of Iran, fifteen cultivars and advanced lines of wheat were studied in a split plot arrangement using a randomized complete block design with three replications and three sowing datas (Oct. 12, Nov. 01, and Nov. 21), at six locations, for two cropping seasons (2005-2007). Yield from stations in two years were analyzed to determine the best sowing date for each location. Results of combined analysis showed that the first date (Oct. 12) was suitable for all locations. Therefore, the data of the first date were analyzed based on RCBD in six locations and two years. Since the genotype × year × location interaction was significant, analysis of stability was done. The results of different stability methods were almost similar. According to the results, cultivar Shiraz with a yield average of 9.79 tha-1 was found to be the most stable cultivar followed by line M-18-14 that produced an average yield of 8.8 tha-1. Cultivars Saissons, MV-17, Zarrin, and Kavir had less stability.