نتایج جستجو برای: transation surfaces
تعداد نتایج: 130478 فیلتر نتایج به سال:
In this paper, the method of determining thermal contact resistance of wavy surfaces is discussed exactly. For determining the thermal contact resistance of real contacts, a new method has been presented. In this method, assuming a regular sinusoidal surface profile, the real contact area in terms of applied forces has been determined. Then thermal contact resistance has been calculated. Testin...
Background and purpose: Dental caries are highly prevalent and their exact detection at initial stages is necessary. The laser-based DIAGNOdent device is used to detect these caries. The aim of this study was to assess the level of agreement between visual observation, bitewing radiographs, and DIAGNOdent system in detection of proximal caries in clinical applications. Materials and methods: I...
In order to achieve integrated condition in the girth welding of high pressure natural gas transmission pipelines, the weld zones and its surrounding area should have good mechanical properties. Residual stresses are an important defect especially in the girth welding of the pipeline. In this study, two API X70 steel pipes (with spiral seam weld) of 56 inches outside diameter and 0.780 inch wal...
Vegetation moderates a microclimate by casting shadows, increasing light reflection, evaporation and perspiration; and correcting wind patterns. The present study aims to investigate the microclimatic role of vegetated surfaces and bodies in improving thermal comfort in outdoor spaces between buildings. The main research question is which of the green system modes, that is, horizontal vegetatio...
Chahar-Gonbad copper mine, in Kerman province, has mainly formed as veins with low reserves and medium grade. Mineralization is mainly occured as chalcopyrite, pyrite, rare galena and sphalerite. Sericitic, argillic and propylitic alterations have been identified in this are deposit. These alteration occurod in the thermal range of about 350 C. In this research, the morphology of pyrite c...
Background and Objective: The purpose of this cross-sectional study is to evaluate the microbial contamination of food-handlers' hands and food contact surfaces in food preparation and distribution centers. Materials and Methods: This study was performed in 2019 in Fardis city of Alborz province. In this study, 100 samples of food contact surfaces and 48 samples of staff hands were collected f...
Three-dimensional surface geometry of rock discontinuities and its evolution with shearing are of great importance in understanding the deformability and hydro-mechanical behavior of rock masses. In the present research, surfaces of three natural rock fractures were digitized and studied before and after the direct shear test. The variography analysis of the surfaces indicated a strong non-line...
Background and Aims: Iatrogenic damage to adjacent tooth during proximal cavity preparation is one of the most common side effects in operative dentistry. The aim of this study was to determine prevalence of iatrogenic damages to adjacent tooth during the preparation of proximal Class II cavities among undergraduate students at dental faculty of Tehran University of Medical Sciences in 2010 ....
Background: Shoes is the first point of contact between the foot and the ground in walking.Any change in that could affect the balance and postural stability. The risks associated with slipping and falling is related to the materials of footwear, surface condition, and geometric design of the shoe sole. The aim of this study was to measure the effect of different shoe sole tread groove ...
background: indoor residual spraying (irs) is functioned as national interventions against malaria in southeastern foci of iran and deltamethrin wp one of the insecticides have been used since past decade. in this study, the residual activity of the wettable granule (wg) was studied on different surfaces in hut scale trial against anopheles stephensi in iranshahr district, southeastern iran. ...
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