نتایج جستجو برای: polyblend fibers

تعداد نتایج: 70519  

Journal: :journal of dentistry, tehran university of medical sciences 0
masoomeh hasani tabatabaei associate professor, dental research center dentistry research institute and department of operative dentistry, faculty of dentistry, tehran university of medical sciences, tehran, iran. zahra hasani dentist, department of operative dentistry, shahrekord university of medical sciences, shahrekord, iran & dental research center dentistry research instituteof tehran university, tehran, iran. elham ahmadi assistant professor, department of operative dentistry, shahrekord university of medical sciences, shahrekord, iran & dental research center dentistry research instituteof tehran university, tehran, iran.

color match between fiber-reinforced composite (frc) restorations and teeth is an imperative factor in esthetic dentistry. the purpose of this study is to evaluate the influence of veneering composites and fibers on the color change of frc restorations.glass and polyethylene fibers were used to reinforce a direct microhybrid composite (z250, 3m espe) and a microfilled composite (gradia indirect...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2012
mehdi mehrpooya ali vatani sayed mohammad ali moosavian

a type of novel hypercross-linked fiber adsorbent was obtained by sulfonation and cross-linking reaction of polypropylene fiber grafted styrene-divinylbenzene. the aim of the fiber sulfonation and cross-linking method was to prepare rigid three dimensional networks in the entire fiber and change the ion exchange capacity of fiber. the hypercross-linked fiber adsorbent possesses a principally di...

Journal: :علوم و تکنولوژی پلیمر 0
شیرین شفایی نادره گلشن ابراهیمی

pp/pep blends, because of different solubility factors, are incompatible. the aim of this research was to use pp-g-ma compatibilizer in a two-component blend. after preparing this compatibilizer in internal mixer and investigating different parameters on producing process, optimum compatibilization was obtained. pp/pet (60/40) blend fibers with different percentages of this compatibilizer in tw...

Waste fibers produced from manufacturing processes are a byproduct commonly deposited in storing yards and/or landfills and thus results in many serious environmental problems in Iran. If these waste materials could be advantageously put to practical use in any application, it would reduce the burden on the environment and landfills. This paper compares the performance of the stone matrix aspha...

Ali Abdolahnejad , Ali Asghar Ebrahimi , Amir Mohammadi , Hamideh Niknazar , Mehdi Mokhtari , Negar Jafari , Yaghob Hajizadeh ,

Introduction: Today, have been approved scientifically relationship between presence of asbestos fibers in the human respiratory area and malignant diseases such as lung advanced fibrosis (Asbestosis), gastrointestinal, lung and Laryngeal cancers. The aim of this study was the determination of asbestos fibers concentration in Yazd city’s air in the summer of 2015. Materials and Methods: ...

The performance of asphaltic pavements during their service life is highly dependent on the mechanical properties of the asphaltic layers. Therefore, in order to extend their service life, scientists and engineers are constantly trying to improve the mechanical properties of the asphaltic mixtures. One common method of improving the performance of asphaltic mixtures is using different types of ...

Irregularities are inherent to virtually all fibers, including the conventional textile fibers, the high-performance brittle fibers and newly developed nano-fibers. These irregularities can fall into two main categories: dimensional or geometrical irregularity (external) and structural irregularity (internal). For natural fibers such as wool, diameter variation along fiber length is atypical ex...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده مهندسی نساجی 1386

امروزه، تحقیقات و طرح های توسعه صنعتی در زمینه بیوتکنولو‍ژی و حفظ محیط زیست از اهمیت خاصی برخوردار گردیده و استفاده از امکانات موجود در طبیعت توجه محققین را به خود جلب کرده است. از جمله این موارد، استفاده بهینه از مواد سلولزی و لیگنوسلولزی است. امروزه، استفاده از الیاف طبیعی گیاهی، علاوه بر صنعت نساجی در صنایع پلیمری و خودروسازی از اهمیت خاصی برخوردار شده است. توسعه روز افزون کاربرد الیاف طبیع...

Journal: :international journal of civil engineering 0
m. khorami islamic azad university, branch eslamshahr j. sobhani concrete technology departement, building and housing research centre, tehran, iran, 13145-1696

worldwide, asbestos fibers utilized in fiber cement boards, have been recognized as harmful materials regarding the public health and environmental pollutions. these concerns motivate the researchers to find the appropriate alternatives to substitute the asbestos material towards the sustainability policies. in this paper, the applicability of asbestos replacement with three types of agricultur...

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