نتایج جستجو برای: design of experiment1
تعداد نتایج: 21225601 فیلتر نتایج به سال:
any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...
The KLOE experiment1 runs at the Frascati φ factory DAΦNE, a high luminosity e+e− collider working at √ s ∼ 1020 MeV, corresponding to the φ meson mass. The KLOE detector consists of a large cylindrical drift chamber 2, surrounded by a sampling lead-scintillating fiber electromagnetic calorimeter 3. Both detectors operate inside a uniform magnetic field of ∼ 0.5 T provided by a superconducting ...
در این رساله عملکرد یک موتور توربوپراپ که ملخ آن از نوع clark y 5868-r9 است در شرایط نقطه طرح (on- design) و خارج از نقطه طرح (off- design) مورد مطالعه قرار گرفته شده است. موتور توربوپراپ یکی از انواع موتور جت در تراست بالا و مصرف مخصوص سوخت پایین است که عدد ماخ پروازی آن هرگز از 8/. تجاوز نمی کند. دور موتور های توربوجت به حدی زیاداست که در صورت اتصال مستقیم به ملخ، سرعت نوک تیغه های ملخ به سرع...
People migrate to improve their well-being, whether through an expansion of economic and social opportunities or a reduction in persecution. Yet a large literature suggests that migration can be a very stressful process, with potentially negative impacts on mental health reducing the net benefits of migration. However, to truly understand the effect of migration on mental health one must compar...
Background and Aim: Ovarian vitrification is a technique for assisted reproductive technologies, while ovaries are vulnerable to the damage caused by the freezing procedure. Pentoxifylline has a protective effect as an antioxidant in reducing the free radicals in the culture medium. This study aimed to determine the antioxidant effects of pentoxifylline on the changes stereological vitrified ov...
Introduction Numerosity, the set size of a group items, helps guide behaviour and decisions. Previous studies have shown that neural populations respond selectively to numerosities. How numerosity is extracted from visual scene longstanding debate, often contrasting low-level with high-level cognitive processes. Here, using 7T functional MRI, we investigate how attention influences selective re...
the current study examined iranian undergraduate efl students’ willingness to communicate with regard to their vocabulary knowledge. in general, participants were somewhat willing to communicate in english. the total mean score of 730 university students’ perception of willing to communicate was 83.53 out of 135. results, regarding four parts of willingness to communicate, revealed that part...
parametric design optimization of an automotive body crashworthiness improvement is presented. the thicknesses of parts are employed as design variables for optimization whose objective is to increase the maximum deceleration value of the vehicle center of gravity during an impact. using the taguchi method, this study analyzes the optimum conditions for design objectives and the impact factors ...
introduction: graduate (phd) students in medical sciences, who will form future faculties and investigators in iran’s universities of medical sciences, are not trained on scientific writing during their training. the present study describes the design, implementation, and evaluation of principles of writing biomedical research paper course. methods: the course, prepared based on an extensive se...
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