نتایج جستجو برای: fibers

تعداد نتایج: 70489  

Journal: :Journal of the Japan Society for Composite Materials 1992

ژورنال: سلامت کار ایران 2012
ماری اریاد, 1- حسین, کاکویی, 2- حسین,

  Background and aims : Asbestos minerals are divided into two main groups including serpentine and amphiboles and each has one or more subgroups. These minerals have been used in industrial products such as cement-asbestos sheet and pipe, brake shoe, clutch and insulation materials. Occupational and non - occupational exposures by this carcinogenic material have caused to develop several metho...

Journal: :مهندسی بیوسیستم ایران 0
اعظم زارع میرک آباد کارشناسی ارشد، دانشگاه شهید باهنر احمد غضنفری مقدم دانشیار، دانشگاه شهید باهنر

the use of plant fibers in producing different industrial products has attracted the attention of many researchers. plant fibers, in comparison with industrial ones, are degraded faster in nature and are more environments friendly. one of the major conventional uses of plant fibers is the production of traditional ropes which are subjected to tensile forces. however, the traditional ropes bear ...

Journal: :جنگل و فرآورده های چوب 0
حسین جلالی ترشیزی عضو هیات علمی دانشگاه شهید بهشتی فریبا خلیلی نفت چالی دانش آموخته کارشناسی ارشد حسین کرمانیان عضو هیات علمی دانشگاه شهید بهشتی

by increasing demands on paper products and shortage of fiber resources, various strategies were introduced to meet the requirements. in this context, application of mineral fibers is a novel and growing approach. this study was aimed to reduce the plant fibers by application of, mineral fiber in the papermaking system. application of 0, 10, 20, and 30% loadings of rock wool mineral fibers (rwm...

Introduction: Stimulation of peptidergic fibers activates microglia in the dorsal horn. Microglia activation causes fractalkine (FKN) release, a neuron-glia signal, which enhances pain. The transient vanilloid receptor 1 (TRPV1) mediates the release of neuropeptides, which can subsequently activate glia. TRPV1 and TRPV2 are generally expressed on C and Aδ fibers, respe...

Journal: :acta medica iranica 0
h. soltanghoraiee m. jamali zavarehii m.a. broomand

breast cancer is common and is considered second cause of cancer related mortality in females. regarding importance of breast cancer, more investigation in this field is recommended. for many years investigators believed that neoplasms were not innervated but new findings have proved otherwise. this descriptive study was carried out to compare number of nerve fibers in benign, malignant and nor...

The present paper offers a meso-scale numerical model to investigate the effects of random distribution of aggregate particles and steel fibers on the elastic modulus of Steel Fiber Reinforced Concrete (SFRC). Meso-scale model distinctively models coarse aggregate, cementitious mortar, and Interfacial Transition Zone (ITZ) between aggregate, mortar, and steel fibers with their respective materi...

This paper reports on the effect of fiber crimp frequency on sound absorption capability of staple polypropylene nonwoven batts. Stuffer box was used to impart crimp to spun tow. Crimping of the tow renders the fibers the required textile applicability. In this work, polypropylene batts composed of staple fibers with linear densities of 9, 14, and 18 denier were employed. Three crimp frequency ...

جعفر زاده کاشی, طاهره سادات, عطایی, ابراهیم, فاضل, اکبر, مقتدر نژاد, ساحل,

Introduction: The purpose of this in vitro study was to introduce the fiber reinforced composite bridges and evaluate the most suitable site and position for placement of fibers in order to get maximum strength. Methods: The study included 20 second premolars and 20 second molars selected for fabricating twenty fiber reinforced composite bridges. Twenty specimens were selected for one fiber la...

Diffusion tensor imaging (DTI) MRI is a noninvasive imaging method of the cerebral tissues whose fibers directions are not evaluated correctly in the regions of the crossing fibers. For the same reason the high angular resolution diffusion images (HARDI) are used for estimation of the fiber direction in each voxel. One of the main methods to specify the direction of fibers is usage of the spher...

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