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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: International Journal of Advanced Biological and Biomedical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: GIS,Solar Energy,Solar sites,General radiation,Abarkouh
- چکیده:
- چکیده انگلیسی: In recent decades, due to increasing prices of fossil fuels and environmental pollution resulting from the increased energy demand, researches on renewable energy sources have attracted lots of researcher’s attention. Limited investing sources and environmental issues are important factors effecting electricity generation sector. Minimizing costs and environmental damages are issues being considered by specialists. Seriousness of environmental protection issue and electricity energy security is two main factors causing more emphasized attention on the process of solar power generating electricity. Iran, due to the special geographic position located on radiation belts is a semi-arid country with a warm climate. Therefore, most parts of the country especially central region always benefit clear and sunny sky. For this reason, the study of the construction and deployment of solar sites in this region of the country can make achieving clean energy and sure for residents of these regions. This study uses geographical information systems, general radiation forecasting model, daily sunny hours, and received radiated energy per each month to find regions with more than 7.7 hours sun radiation of more than 5.3 kwh/m²/d suitable for solar sites construction.
- انتشار مقاله: 10-05-1393
- نویسندگان: Alireza Dehghanpour Farashah,Amir Hossein Halabian,M. Fallahpour
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Advanced Biological and Biomedical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Entrepreneurial spirit,Wood and paper industry,Educational and academic factors
- چکیده:
- چکیده انگلیسی: The purpose of this paper is to explore the influential factors on entrepreneurial spirit of wood and paper industries students in two universities, namely Agriculture and natural resources faculty of Tehran University and Shahid Rajaiee teacher training University. A sample of 100 students were selected from a target population of 572 students using the Cochran formula. The respondents were asked to provide their answers to a standardized questionnaire. Results indicated that from the students’ perspective such factors as motivation, providence and achievement propensity had the greatest impact on entrepreneurial spirit of the respondents whilst factors like internal control, exception ability and having systematic attitude had the least influence. Moreover concerning the effect of educational and academic factors on entrepreneurial spirit, the most effective items were respectively favorable access to computer and internet and learned and efficient instructors whereas the least effective items considered were degree orientation, students’ apprenticeships in executive environments and education at the university. The findings showed a significant positive relation at the significance level of 0.05 between the level of education and age with the creation of entrepreneurial spirit amongst students. Furthermore a significant positive relation was observed between educational and academic factors, propensity to achievement, risk taking and ambiguity toleration, control source and family with entrepreneurial spirit at the significance level of 0.01. Also the results of multiple regression analysis showed that 79.7%of entrepreneurial spirit (the dependent variable) variance was explained by such independent variables as educational and academic factors, achievement propensity, being innovative, risk taking and ambiguity toleration, control source and family.
- انتشار مقاله: 28-04-1393
- نویسندگان: Feizollah Monavari Fard,Seyed Alireza Dehghan,Amine Lotfian,Laleh Salehi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Schiff base ligand,N3O2S donor,Unsymmetrical ligand,Thioether ligand,2-Aminoethanethiol
- چکیده:
- چکیده انگلیسی: A new unsymmetric thioether diamine N - ( 2 - ( 2 - aminophenylthio) ethyl) benzene - 1 , 2 - diamine was prepared through the nucleophilic substitution of cysteaminium chloride with 1 - chloro - 2 - nitrobenzene and then the nitro groups of prepared compuond converted to the amine by zinc powder and ammonium chloride. Then, unsymmetric Schiff bass ligand 2 - ((( 2 - (( 2 - (( 2 - (( 2 - hydroxybenzylidene) amino)phenyl) amino) ethyl) thio) phenyl )imino) methyl )phenol [H2L] was synthesized via [2 + 1] condensation of 2-hydroxybenzaldehyde with this unsymmetric thioether diamine and the corresponding Schiff base complexes of this ligand were prepared by adding metal salts of Zn(II), Cu(II), Ni(II) and Mn(II). The thioether diamine, ligand and unsymmetric Schiff base complexes are characterized by FT - IR, UV - Vis, 1H NMR, 13C NMR spectroscopy, molar conductivity, microanalysis and mass spectrometry
- انتشار مقاله: 15-05-1396
- نویسندگان: Ahmad Ali Dehghani-Firouzabadi,Seyed Hossein Mirmohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Schiff base complex,Zn(II) complex,Pentadentate ligand,Binuclear complex,N2O2S donor
- چکیده:
- چکیده انگلیسی: The reactions of 1 - chloro - 2 - nitro benzene with 2 - Amino thio phenol yield the 2 - ( ( nitro phenyl ) thio ) aniline and then 2 , 2' - thio dianiline of this compound was prepared . Also the symmetrical potentially pentadentate N 2 O 2 S Schiff base ligand 2 , 2' - ( ( ( thio bis (1 , 2 - phenylene ) ) bis ( azanilidene ) ) bis ( methenilidene ) ) diphenol ( H 2 L ) obtain by added salicylaldehyde . These compound have been characterized by FT - IR , 1 H NMR and Mass Spectrometry . Bi - nuclear Zn ( II ) complex of this ligand was prepared and structurally characterized by X - ray crystallography . The coordination geometry around Zn ( II ) is intermediate between trigonal bipyramidal and square pyramidal , τ = 0.54.
- انتشار مقاله: 24-08-1395
- نویسندگان: Ahmad Ali Dehghani-Firouzabadi,Tahereh Alizadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: Heating Needed Energy,Number of People Per Area,Supportive Space
- چکیده:
- چکیده انگلیسی: Decreasing heating needed energy of building located in mountainous areas without any urban infrastructure of energy supply and services is one of the most important things to get thermal comfort. Accordingly, using building conditions based on different types of applicability and passive design strategies should be considered. Therefore, the objective of this study was to achieve the proper heating needed energy for proposing functional model as a mountainous shelter located in Iran. Two influence factors namely, number of people per area and different supportive space were considered. The analysis has been performed by Honeybee and Ladybug add-ons in Rhino/Grasshopper software. Material characteristic, zone load, location and climate data as sub-parameter were calculated using ASHRAE Standard 90.1-2010. The results indicated that regarding to time-use period of the shelter that is mostly in warm months, the highest performance of the space, based on minimum heating needed energy was attributed to the maximum size of supportive space by 608 m2 when the number of people was 0.26 per area. The reduction of heating needed energy was 17% in cold month and 23% in warm month.
- انتشار مقاله: 17-12-1395
- نویسندگان: Azin Keshtkarbanaeemoghadam,Mohammad Hadi Kaboli,Ali Dehghanbanadaki
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: ginger,Curcumin,oral squamous cell carcinoma,Saffron,Cinnamon
- چکیده:
- چکیده انگلیسی: Backgrounds: Oral squamous cell carcinoma (OSCC) is among the most frequent oral cancers in individuals under 40. Documents have endorsed that a diet enriched with fruit and vegetables can banish the risk of developing major cancers. This study aimed to evaluate the effects of different concentrations of four medicinal herbs including saffron, ginger, cinnamon and curcumin on OSCC cell line. Methods: Having obtained the aqueous extract of the four herbs, they were administered on OSCC cell lines per se and in dual, triple, and quadruple combinations. Their effects were measured in different concentrations and in 24 and 48 hours by using MTT assay. Results: The minimum and maximum effective concentrations were respectively 108 and 217 mg/ml for curcumin with IC30 of 77mg/ml, 108 and 270 mg/ml for ginger with IC30 of 58 mg/ml, 2 and 10 mg/ml for saffron with IC30 of 1.9 mg/ml, and 5 and 40 mg/ml for cinnamon with IC30 of 3.3 mg/ml. The best effect of the combinations was seen for cinnamon-saffron after both 24 and 48 hours and the four herbs combination after 48 hours. Conclusion: Although all the four herbs were effective on OSCC cell line, the strongest extract was saffron, followed by cinnamon. Combination of cinnamon-saffron and combination of the four herbs showed maximum effects. These findings suggest that traditional medicinal herbs may potentially contribute to oral cancer treatment; providing new windows for the development of new therapeutic strategies for OSCC.
- انتشار مقاله: 30-06-1398
- نویسندگان: Ali Dehghani Nazhvani,Najmeh Sarafraz,Fatemeh Askari,Fahimeh Heidari,Mahboobeh Razmkhah
- مشاهده
- جایگاه : پژوهشی
- مجله: Applied Research on English Language
- نوع مقاله: Journal Article
- کلمات کلیدی: Reflection,Classroom Management Orientations,Perceptions of Language Learning Strategies,L2 Achievement,EFL Teachers
- چکیده:
- چکیده انگلیسی: The present study was conducted to investigate the relationship among three important teacher
variables and students’ L2 achievement. To this end, 105 high school EFL teachers from Shiraz and
Hamadan were asked to fill out three sets of instruments: the reflective teaching instrument, (Akbari,
Behzadpour & Dadvand, 2010), the Attitudes and Beliefs on Classroom Control Inventory (Martin,
Yin, & Baldwin, 1998), and the Strategy Inventory for Language Learning (Ardasheva & Tretter,
2013). Also, the scores of the English final exams of 2673 third-grade high school students were
collected. The results of Pearson Product Moment Correlations revealed that there was a significant
correlation between the above-mentioned three teachers’ variables and their students’ L2
achievement. The results also showed a significant difference between male and female teachers in
the degree of perceptions of LLSs, while no significant differences were found between the two
genders regarding their classroom management orientations and reflection. Moreover, running
multiple regression analysis, it was revealed that among the teachers’ variables, reflection was the
strongest predicator of students’ L2 achievement. Finally, based on the results of this study, some
practical implications for maximizing students’ L2 achievement in English language classrooms are
presented.- انتشار مقاله: 25-03-1395
- نویسندگان: Mohammad Hadi Mahmoodi,Neda Izadi,Maliheh Dehghannezhad
- مشاهده
- جایگاه : پژوهشی
- مجله: Advance Researches in Civil Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Gypsum plaster,Mixing rate,setting time,Strength,Microstructure
- چکیده:
- چکیده انگلیسی: Gypsum plaster is a widely used building material, as it is inexpensive and mechanically strong and to make gypsum model for ceramics manufacture as modelling material. When in contact with water, calcined gypsum rehydrates through dissolution, nucleation and crystallization steps. In this work, the mixing rate of plaster with water was investigated on their effect on the properties of hardened gypsum pieces, focusing on the structure–function relationship. The mixing plaster with water was done at 120, 240, 360 and 600 rounds per minute with a constant water/ plaster ratio of 0.77. The results showed that with increasing mixing rate, the setting time decreased and the mechanical strength of the hardened piece increased. The apparent porosity, water absorption and water diffusion coefficient of the hardened piece decreased with increasing mixing rate. The microstructure of gypsum with the high mixing rate not only seems to be denser, with crystals interlaced, but also shows short crystals, which may improve the mechanical strength of the specimen. The higher mixing rate can lead to the higher rate of the nucleus formation, the smaller crystals and denser structure are formed. This material can have higher strength.
- انتشار مقاله: 08-03-1397
- نویسندگان: Hajar Ahmadi Moghadam,Mozafar Jalili Masir,Zahra Bandani Torshaki,Ali Dehghan
- مشاهده
- جایگاه : پژوهشی
- مجله: Advance Researches in Civil Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Gypsum plaster,Mixing rate,setting time,Strength,Microstructure
- چکیده:
- چکیده انگلیسی: Gypsum plaster is a widely used building material, as it is inexpensive and mechanically strong and to make gypsum model for ceramics manufacture as modelling material. When in contact with water, calcined gypsum rehydrates through dissolution, nucleation and crystallization steps. In this work, the mixing rate of plaster with water was investigated on their effect on the properties of hardened gypsum pieces, focusing on the structure–function relationship. The mixing plaster with water was done at 120, 240, 360 and 600 rounds per minute with a constant water/ plaster ratio of 0.77. The results showed that with increasing mixing rate, the setting time decreased and the mechanical strength of the hardened piece increased. The apparent porosity, water absorption and water diffusion coefficient of the hardened piece decreased with increasing mixing rate. The microstructure of gypsum with the high mixing rate not only seems to be denser, with crystals interlaced, but also shows short crystals, which may improve the mechanical strength of the specimen. The higher mixing rate can lead to the higher rate of the nucleus formation, the smaller crystals and denser structure are formed. This material can have higher strength.
- انتشار مقاله: 08-03-1397
- نویسندگان: Hajar Ahmadi Moghadam,Mozafar Jalili Masir,Zahra Bandani Torshaki,Ali Dehghan
- مشاهده