نتایج جستجو برای: degree of grains whiteness

تعداد نتایج: 21169560  

Journal: :The journal of contemporary dental practice 2014
Sandrine Bittencourt Berger Rafaela Pazenhagen Natan Martinelli Sandra Kiss Moura Rodrigo Varella de Carvalho Ricardo Danil Guiraldo

The aim of this study was to evaluate the effect of bleaching on the flexural strength of bovine dentin, using bleaching agents containing calcium (Whiteness HP Blue and Whiteness Class) and not containing calcium (Whiteness HP and Whiteness Perfect). Sixty bovine incisor tooth slices were obtained and divided into fve experimental groups (n = 12), such as G1, untreated control group; G2, White...

ژورنال: گلجام 2011
رحیمی, محمد‌کریم, سعادتدار آرانی, اقدس‌سادات, منتظر, مجید,

 Today, the use of enzymes and antibacterial protein fibers is greatly favored by researchers to protect textile against microbial attacks, spots, discoloration and to increase shelf life of silk carpets in museums. This study investigates the effect of protease and nanosilver on silk yarn. Silk yarn with 140 Tex as a carpet pile treated with protease and nanosilver in different conditions...

Journal: :فیزیک زمین و فضا 0
محمد حامدپور دارابی استادیار، گروه فیزیک، دانشگاه هرمزگان، ایران مریم نورافشان مربی، گروه فیزیک، دانشگاه هرمزگان، ایران جان دیرینگ استاد، گروه جغرافیا، دانشگاه لیورپول، انگلستان

using a magnetic property measurement system (mpms), we measure magnetic susceptibility continuously at frequencies from 0 to 1000 hz for three different superparamagnetic (sp) grain sizes of magnetite (5nm, 7 nm and 10 nm) suspended in hydrocarbons (ferrofluids). our results confirm non-zero values of frequency-dependent susceptibility in the fine tail of nano-sized grains and provide new empi...

Journal: :Acta odontologica latinoamericana : AOL 2010
Aleska D Vanderlei Sheila P Passos Susana M Salazar-Marocho Sarina Mb Pereira Vanessa Zc Vásquez Marco A Bottino

The aim of this study was to assess the effect of bleaching agents (10% and 16% carbamide peroxide) on the roughness of two dental ceramics in vitro, and to analyze the surface by scanning electronic microscopy (SEM). Two bleaching agents (10% and 16%/Whiteness, FGM Gel) and two microparticle feldspathic ceramics (Vita VM7 and Vita VM13) were used. Forty disks of Vita VM7 and Vita VM13 ceramic ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده زبانهای خارجی 1392

to teach english adequately, qualified teachers are needed. unfortunately, there are still teachers who are teaching english without an academic degree in tefl. it is necessary for teachers to have a major in english to have subject knowledge, but it is not sufficient. teachers need to have an understanding of the social, cultural, moral, ethical, and pedagogical issues of education and practic...

Journal: :پژوهش های علوم و صنایع غذایی ایران 0
atena pasban mohebbat mohebbi hashem pourazarang mahdi varidi

enzymatic browning and formation of brown pigments are some of the most important problems in preparation of mushroom purees. in this study, the effect of some anti browning agents including sodium metabisulphite, ascorbic acid, and citric acid on the whiteness and foaming properties of mushroom purees was investigated. the results showed that soaking with acids and sodium metabisulphite signif...

Journal: :Science 2007
Pete Vukusic Benny Hallam Joe Noyes

The colored appearances of animals are controlled by pigmentation, highly periodic ultrastructure, or a combination of both. Whiteness, however, is less common and is generated by neither of these, because it requires scattering processes appropriate for all visible wavelengths. We report whiteness resulting from a three-dimensional photonic solid in the scales of Cyphochilus spp. beetles. Thei...

Journal: :Journal of dentistry 2008
Andrew Joiner Ian Hopkinson Yan Deng Stephen Westland

OBJECTIVES To review current knowledge on the definition of tooth whiteness and its application within dentistry, together with the measured range of tooth colours. METHODS 'Medline' and 'ISI Web of Sciences' databases were searched electronically with key words tooth, teeth, colour, colour, white and whiteness. CONCLUSIONS The application of colour science within dentistry has permitted th...

پایان نامه :0 1374

the following null hypothesis was proposed: h : there is no significant difference between the use of semantically or communicatively translates scientific texts. to test the null hypothesis, a number of procedures were taken first, two passages were selected form soyrcebooks of food and nutrition industry and gardening deciplines. each, in turn, was following by a number of comprehension quest...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مدیریت و حسابداری 1391

the application of e-learning systems - as one of the solutions to the issue of anywhere and anytime learning – is increasingly spreading in the area of education. content management - one of the most important parts of any e-learning system- is in the concern of tutors and teachers through which they can obtain means and paths to achieve the goals of the course and learning objectives. e-learn...

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