نتایج جستجو برای: bond strength.

تعداد نتایج: 267790  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی عمران 1386

در این پژوهش تلاش شده است تا با انجام مشاهدات مستقیم آزمایشگاهی بر حدود تاثیرگذاری سه پارامت "سیکل های گرم وسرد شدن لوله" و "زبری سطح ورق فولاد" و همچنین "دامنه تغییرات دما" بر یک معیار مقاومتی مرتبط همچون مقاومت پیوستگی (bond strength) بین پوشش و فولاد تعیین گردد.

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

abstract the influence of cation?? and anion?? interactions on the strength and nature of n…h hydrogen bond has been investigated by quantum chemical calculations in s-triazine…3hf complex. ab initio calculations were performed at mp2/6-311++g(d,p) level of theory. the natural bond orbital (nbo) analysis and the bader’s quantum theory of atoms in molecules (aim) were also used to elucidate t...

Journal: :journal of lasers in medical sciences 0
homayoon alaghehmand dental materials researches center, babol medical sciences university, babol, iran fatemeh nezhad nasrollah dental material research center, department of restorative dentistry, faculty of dentistry, babol university of medical sciences, babol,iran hanieh nokhbatolfoghahaei school of advanced technologies in medicine, shahid beheshti university of medical sciences, tehran, iran reza fekrazad laser research center in medical sciences (lrcms), department of periodontics, faculty of dentistry, aja university of medical sciences, tehran, iran & international network for photo medicine and photo dynamic therapy (inpmpdt), universal scientific education and research network (usern), tehran, iran

introduction: the aim of this study was to compare the micro-shear bond strength of composite resin on superficial and deep dentin after conditioning with phosphoric acid and erbium-doped yttrium aluminum garnet (er:yag) laser. methods: thirty human molars were selected, roots were removed and crowns were bisected to provide a total of 60 half-crowns. specimens were ground to expose superficial...

Journal: :iranian endodontic journal 0
fereshte sobhnamayan alireza adl nooshin sadat shojaee samina gavahian

introduction: the aim of this in vitro study was to evaluate the effect of 2% chlorhexidine (chx) on the push-out bond strength (bs) of calcium-enriched mixture (cem) cement. methods and materials: root-dentin slices from 60 single-rooted human teeth with the lumen diameter of 1.3 mm were used. the samples were randomly divided into 4 groups ( n =15), and their lumens were filled with cem cemen...

2016
Sadaf Moallemi Pour M. Shahria Alam Abbas S. Milani

This paper explores a set of new equations to predict the bond strength between fiber reinforced polymer (FRP) rebar and concrete. The proposed equations are based on a comprehensive statistical analysis and existing experimental results in the literature. Namely, the most effective parameters on bond behavior of FRP concrete were first identified by applying a factorial analysis on a part of t...

Journal: :journal of dentistry, tehran university of medical sciences 0
m.s. a. akhoundi f. mojtahedzadeh

bonding brackets to the enamel surface has gained much popularity today. new adhesive systems have been introduced and marketed and a considerable increase in research regarding bond strength has been published. a considerable amount of these studies deal with shear bond strength of adhesives designed for orthodontic purpose. previous studies have used variety of test designs. this diversity in...

Journal: :international journal of transportation engineereing 2014
mahabir panda jyoti prakash giri bidyut bikash sutradhar

poor adhesion between two successive bituminous layers causes adverse effects on the structural strength of the pavement and develops a numbers of premature failure. to improve the adhesion, it is a general practice to apply a tack coat over an existing or newly constructed bituminous surface before laying another bituminous layer. the main objective of this study is to explore the influence of...

Esmail Yasini, Ladan Ranjbar Omrani, Mansoureh Mirzaee, Mohammad Javad Kharrazifard, Nasim Chiniforush, Paniz Fasih, Shiva Rafiezadeh,

Background and Aim: Preparation of tooth structure by laser systems produces a surface with different characteristics. Therefore, selecting an appropriate bonding system is necessary to achieve the maximum bond strength. The aim of this study was to compare the bond strength of Adper Single Bond 2 adhesive and Single Bond Univer-sal to dentin prepared by bur or laser. Materials and Methods: ...

Journal: :dental research journal 0
claudio poggio riccardo beltrami andrea scribante marco colombo marco chiesa

background: the aim of this study was to compare the shear bond strength of four one-step self-etch adhesives with different ph values to enamel and dentin. materials and methods: in this in vitro study, 200 bovine permanent mandibular incisors were used. four one-step self-etch adhesives with different ph values were tested both on enamel and on dentin: adper™ easy bond self-etch adhesive (ph ...

ژورنال: مجله دندانپزشکی 2013
جلالی, حمید , رشتاک, شاداب , صدیق‌پور, لیلا , میرمحمدرضایی, سوسن ,

  Background and Aims: Retention and stability of the post and core system is the key factor for success of final restoration . The aim of this study was to evaluate the microtensile bond strength of the different composite core materials and bonding systems to a fiber post.   Materials and Methods: To evaluate the bond strength of the composite resins to a fiber post ( DT light post) 60 posts ...

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