نتایج جستجو برای: multi talented catalysts
تعداد نتایج: 499145 فیلتر نتایج به سال:
It is very stressful to constantly struggle to meet the expectations of others or expectations of self, and it affects onechr(chr('39')39chr('39'))s performance. The purpose of this study was the effect of intervention based on Dweck’s mind set on academic expectations stress in gifted and talented school students. The project’s plan was a quasi-experimental study with a pretest-posttest des...
Pt/Zr(x)-HMS/HZSM-5 catalysts with different ratios of Silicium/Zirconium (denoted as x) were studied for normal heptane reforming at 350-450 °C temperature range. For this purpose, the properties of the catalysts such as X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy, Ultraviolet–visible diffuse reflectance spectroscopy, NH3-temperature pro...
Two late transition metal catalysts based on 2,6-bis(imino)pyridine iron(II) were synthesized by introducing methyl substitution (catalyst A) and t-Butyl substitution (catalyst B) at the ortho position of the aryl rings of the ligand. Comparative ethylene polymerizations using the catalysts showed quiet different behaviors. The activity of catalyst A was higher than that of catalyst B in all of...
Background and Objective: Emotional Intelligence provides a new perspective to anticipate effective factors on people's success in a society. Cognitive Intelligence, in its best context, is the cause of 20 percent of people's success in their life. 80 percent of success depends on other factors like Emotional Intelligence.In our educational system there is more emphasis on cognitive intelligenc...
Background and Objective : Paying attention to mental health of students in adolescence decreases the burden of psychological disorders in their subsequent life. This paper aimed to study the psychological disorders of ordinary, talented and orphan students in high schools of Kerman city. Materials and Methods: This and cross-sectional study was carried out in 2010. A pilot study for prelim...
This study compared academically talented students (n = 23) who were not at risk for school failure and resilient at-risk students (n = 27) on risk factors and protective/promotive factors. Participants’ risk status was determined by student assignment. The academically talented students were attending a summer program at a major research university and the at-risk students were graduates of a ...
in this research different types of al2o3 were used as supports to prepare catalysts for dehydrogenation of isobutane to isobutene. these supports were al2o3 from merck, axen and gamma al2o3 synthesized from al(oh)3. sn/pt/al2o3 catalysts were prepared by sequential impregnation, at first pt and then sn was deposited. characterization of catalysts was performed by x-ray powder diffraction (xrd)...
Catalytic pyrolysis is a promising thermochemical conversion route for lignocellulosic biomass that produces chemicals and fuels compatible with current, petrochemical infrastructure. Catalytic modifications to pyrolysis bio-oils are geared towards the elimination and substitution of oxygen and oxygen-containing functionalities in addition to increasing the hydrogen to carbon ratio of the final...
A green methodology for the development of the synthesis of dihydropyrimidinones via a clean multi-component Biginelli reaction by using cyclohexane-1,4-diyl bis (hydrogen sulfate) (CDBH) as an effective catalyst in water and solvent-free conditions was reported. This sulfonated catalyst is an efficient and environmentally benign homogeneous catalysts which characterized by using different tech...
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