نتایج جستجو برای: roughness

تعداد نتایج: 21806  

2014
Karen A. Flack Michael P. Schultz

This paper outlines the authors’ experimental research in rough-wall-bounded turbulent flows that has spanned the past 15 years. The results show that, in general, roughness effects are confined to the inner layer. In accordance with Townsend’s Reynolds number similarity hypothesis, the outer layer is insensitive to surface condition except in the role it plays in setting the length and velocit...

Journal: :journal of dentistry, tehran university of medical sciences 0
jaber yaghini narges naghsh elaheh attaei reza birang ehsan birang

objectives: scaling and root planing (srp) is one of the most commonly used procedures during periodontal treatment. the aim of this study was to evaluate the root surface roughness after srp with erbium: yttrium aluminum garnet (er:yag) laser compared to ultrasonic and hand instruments.   materials and methods: in this experimental study, 56 extracted sound single-rooted teeth with moderate le...

Journal: :journal of dental biomaterials 0
maryam sadeghi undergraduate student, shiraz dental school, shiraz university of medical sciences, shiraz, iran z deljoo undergraduate student, shiraz dental school, shiraz university of medical sciences, shiraz, iran rafat bagheri dental materials department and biomaterials research centre, shiraz dental school, shiraz university of medical sciences, shiraz, iran

abstract statement of the problem: surface roughness is a key factor in the aesthetics of restorative dentistry as it can determine the clinical quality and success of restorative materials. the chemical process of dissolution in the presence of mechanical forces can accelerate the surface roughness of tooth-coloured restorative materials. objectives: to determine the degree of surface roughnes...

2013
A. Kawamura

Simultaneous measurements of the curves for wear versus distance, wear rate versus distance, and coefficient of friction versus distance were performed in situ to distinguish the transition from severe running-in wear to mild wear. The effects of the initial surface roughness on the severe running-in wear volume were investigated. Disk-on-plate friction and wear tests were carried out with SUS3...

Journal: :تحقیقات مهندسی کشاورزی 0
هادی رمضانی اعتدالی دانشجوی دکتری عبدالمجید لیاقت دانشیار گروه آموزشی مهندسی آبیاری و آبادانی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران فریبرز عباسی دانشیار مؤسسه تحقیقات فنی و مهندسی کشاورزی کرج

the manning roughness coefficient is an important parameter in the design and evaluation of furrow irrigation. despite its importance, estimation of this parameter for surface irrigation is very difficult, particularly in furrow irrigation. in this study, an evalue model was used to estimate the manning roughness coefficient in furrow irrigation. the model was based on volume balance and develo...

Journal: :Remote Sensing 2016
Xi Shao Changyong Cao Tung-Chang Liu

The Visible Infrared Imaging Radiometer Suite (VIIRS) onboard Suomi National Polar Orbiting Partnership (SNPP) uses a solar diffuser (SD) as its radiometric calibrator for the reflective solar band calibration. The SD is made of SpectralonTM (one type of fluoropolymer) and was chosen because of its controlled reflectance in the Visible/Near-Infrared/Shortwave-Infrared region and its near-Lamber...

2000
Meelis Mölder Anders Lindroth

One of the surface energy balance components, the sensible heat flux, can easily be described for modelling and remote sensing purposes by means of the thermal roughness length (zot). This roughness length is usually expressed relative to the roughness length for wind speed (zou): kB−1 = ln(zou/zot). In the past, the kB−1 factor has been taken as a constant having a value of ca. 2 in the case o...

Journal: :Optics letters 2009
Arunkumar Jagannathan Andrew J Gatesman Robert H Giles

This paper reports on the effect of random Gaussian roughness with rms roughness values of 5-20 microm on the terahertz reflection spectra of metallic aluminum surfaces using Fourier transform IR spectroscopy. By comparing experimental data with a theoretical model based on the Kirchhoff approximation, the rms roughness of a surface is accurately determined. The rms roughness determined by this...

2011
Olaf Marxen Gianluca Iaccarino Eric S.G. Shaqfeh

The effect of localized roughness on a Ma=4.8 boundary-layer and its instability is investigated by means of unsteady direct numerical simulations. The occurrence of special flow features, such as shocks, boundary-layer separation zones, streamwise vortices and streamwise streaks behind a three-dimensional square-shaped roughness element are discussed. In order to investigate the convective ins...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید