نتایج جستجو برای: enhancement ofenergy efficiency
تعداد نتایج: 507720 فیلتر نتایج به سال:
data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...
هدف از انجام تحقیق .بر اساس یافته ها تاکنون میزان تاثیراین تکنیکها در مقایسه با سایر روشها براساس اطلاعات آماری و به صورت عددو رقم بررسی و نمایش داده نشده اند و به همین دلیل این رویکرد نتوانسته توجه اساتید و مربیان آموزش زبان را در کشورمان به خود جلب کند. از اینرودر این پژوهش بر آن شدیم تا میزان تاثیر تکنیکهای معرفی شده در این رویکرد را با انجام یک تحقیق آزمایشی بر روی سه گروه از دانشجویان برر...
One major problem of the conventional solar cells is low conversion efficiency. In this work, we have proposed a new design including hemisphere texturing on top and metallic plasmonic nanostructure under the silicon layer to enhance the optical absorption inside the photosensitive layer. The finite-difference time-domain (FDTD) method has been used to investigate the interaction of light wi...
A well known technique for speech enhancement is spectral subtraction. This technique is attractive due to its simplicity and its low computational cost. However, spectral subtraction has the drawback of generating residual noise with a musical character, the so-called musical noise. In this paper, we propose a simple modi cation of the lter coe cient calculation in form of a recursion of the p...
We have studied the excitation second-order nonlinearity through a triangular lattice perforated gold film instead of square lattice in many papers. Under the excitation of surface plasmas resonance effect, the second order nonlinearity exists in the noncentrosymmetric split-ring resonators arrays. Reflection of fundamental frequency wave through a triangular lattice perforated gold film is obt...
An experimental and theoretical energy and exergy analysis was conducted for a cylindrical cavity receiver employed in a parabolic dish collector. Based on simultaneous energy and exergy analysis, the receiver average wall temperature and overall heat transfer coefficient were determined. A simplified Nusselt number for Heat Transfer Fluid (HTF) through the receiver as a function of Reynolds an...
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