نتایج جستجو برای: glass

تعداد نتایج: 72128  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده مهندسی 1391

الیاف شیشه، الیاف ظریف خمش پذیری از خانواده شیشه با اجزاء اصلی sio2-al2o3-cao-mgo و ناخالصی های قلیایی، اکسید های معدنی tio2,fe2o3 و افزودنی b2o3 و فلئور می باشد و در حالت مذاب بصورت رشته های نخی شکل، رشته رشته می شود.الیاف شیشه به دو گروه اصلی پشم شیشه و الیاف پیوسته تقسیم بندی می شود و الیاف شیشه نیز بر حسب شرایط مصرف به چندین نوع e-glass , a-glass, c-glass , r-glass , s-glass , ecr-glas...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اراک - دانشکده علوم پایه 1392

الکتروانباشت یکی از ساده¬ترین، انعطاف¬پذیرترین و کم¬هزینه¬ترین روش¬های لایه¬نشانی نسبت به سایر روش¬های موجود بر پایه¬ی تکنیک خلأ می¬باشد که امکان رشد تک لایه¬ای¬ها، چندلایه¬ای¬ها و لایه¬های آلیاژی مغناطیسی را در شرایط طبیعی دما و فشار فراهم می¬کند. در این پروژه لایه¬های نازک ag،co و آلیاژیag-co بر روی زیرلایه¬های فلزی مس و au2pdag/glass،به روش الکتروانباشت با ¬درصدهای مختلف کبالت درمد کرنوکول...

2005
Patricia N. Manley

The Sierra Nevada’s biological distinction and diversity are almost as legendary as its spectacular peaks and beautiful granite landscapes. The Sierra Nevada is recognized as a zoogeographic region on the basis of the coincidence of species ranges (for example, Udvardy 1969, 1975; Welsh 1994). Udvardy (1969) defined the Sierra Nevada bioregion as bounded by the Great Basin to the north and east...

Journal: :journal of dentistry, tehran university of medical sciences 0
sumitha upadhyay specialist resident, department of pedodontics & preventive dentistry, mangalore, india. arathi rao ramya shenoy

to investigate and compare the amount of fluoride release of conventional, resin modified and nanofilled resin modified glass ionomer cements.tablets of glass-ionomer cements were immersed in deionized water and incubated at 37°c. after 1, 2, 7, 15 and 30 days, fluoride ion was measured under normal atmospheric conditions by fluoride ion selective electrode. buffer (tisab ii) was used to decomp...

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Study on the production technology in ancient glass artefacts is one of the interesting subject in the field of archaeological sciences. The aim of this study is to identify the chemical composition and production technology in the glass objects discovered form the underground hand-made architectural complex of Arzanfood, near Hamedan, in western Iran. These objects are including some broken pi...

Journal: :journal of dentistry, tehran university of medical sciences 0
h. torabzadeh associate professor, department of operative dentistry, school of dentistry, shahid beheshti univers r. aminian associate professor, dental research center dental, shahid beheshti university of medical sciences, a. ghasemi associate professor, dental research center dental, shahid beheshti university of medical sciences,

objective: the aim of this study was to investigate the translucency of resin-modified glass-ionomer cements (rmgic) and polyacid-modified composite resin (pcmr) over a period of one year. materials and methods: the study was done on three rmgic (fuji ii lc, photac-fil aplicap and vitremer) and one pcmr (dyract). a conventional gic (fuji cap ii) and two composite resins (tetric and z 100) were ...

Journal: :journal of dental materials and techniques 0
mostafa sadeghi professor, department of operative dentistry, school of dentistry, rafsanjan university of medical sciences, rafsanjan, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی رفسنجان (rafsanjan university of medical sciences) mohammad atafat assistant professor, department of operative dentistry, school of dentistry, rafsanjan university of medical sciences, rafsanjan, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی رفسنجان (rafsanjan university of medical sciences) mehdi abbasi assistant professor, department of operative dentistry, school of dentistry, rafsanjan university of medical sciences, rafsanjan, iran.سازمان اصلی تایید شده: دانشگاه علوم پزشکی رفسنجان (rafsanjan university of medical sciences)

background: the clinical success of sandwich technique depends on the strength of resin-modified glass ionomer cement (rmgic) bonding to both dentin and resin composite. therefore, the shear bond strength (sbs) of resin composite bonded to rmgic utilizing different resin adhesives versus a gic-based adhesive was compared. materials and methods: in this in vitro study, 84 holes (5×2 mm) were pre...

 Oxyfluoride glass ceramics containing CaF2nano-crystals doped with Y3+ ions were prepared by one-step crystallization of SiO2- Al2O3- CaO- CaF2 glasses at different temperatures. X- ray diffraction (XRD) results have revealed that CaF2 was the only precipitated crystalline phase in glass ceramic samples. According to the XRD results, a glass ceramic was selected as the best sample in order to ...

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