the purpose of this study was to analyze those factors affecting volunteering in sport associations of universities in tehran. the research was a descriptive, survey and field study and was categorized as an applied research based on its aim as well. in order to collect the data, a questionnaire (andam, 2007) was used and distributed among target population which consisted of all boys and girls...

the effect of single and double-layer anti-reflective coatings on efficiency enhancement of silicon solar cells was investigated. the reflectance of different anti-reflection structures were calculated using the transfer matrix method and then to predict the performance of solar cells coated by these structures, the weighted average reflectance curves were used as an input of a pc1d simulation....

the aim of this qualitative research is to identify the outcomes of vigor. since 2000, in un’s view, such variables as vigor, life expectancy, gratification and satisfaction are computed as key variables in determining nations’ development level which shows the importance of studying vigor. the methodology is an exploratory study in terms of purpose and it is a qualitative survey in terms of da...

Color is the first feature of foods noticed by consumers; It one essential sensory properties that directly affect acceptance foods. Although have unique colors, there are losses due to external factors such as temperature, acidity, and light during processing. Today, artificial coloring agents frequently used preserve color Scientific studies revealed adverse effects colorants on health, numbe...

canola production is an important alternative for agricultural policy-makers in iran to reduce dependency on the imported vegetable oils. nevertheless, the canola planted area is only increasing at a slow pace, indicating a low willingness-to-accept of farmers. the general aim of this study was to determine the factors influencing the canola adoption in the kermanshah province in western iran. ...

sensors onboard meteorological satellites such as modis and avhrr are able to collect information adequate in frequency but with low spatial resolution. the problem can be overcome, if one finds a way to increase the quality of the vegetation indices through searching in each individual pixel of the images, employing concurrent higher spatial resolution images. the objective of this study was t...

to investigate the effect of preprocessing techniques including contrast enhancement and illumination correction on retinal imagequality, a comparative study was carried out. we studied and implemented a few illumination correction and contrast enhancementtechniques on color retinal images to find out the best technique for optimum image enhancement. to compare and choose thebest illumination c...