نتایج جستجو برای: fiber

تعداد نتایج: 130252  

Journal: :Journal of the Japan Institute of Metals and Materials 1975

ژورنال: سلامت کار ایران 2016

Background and aims: Conventional Methods for determination of volatile organic pollutants in the air are based on solvent extraction. Solid-phase microextraction (SPME) has been popular as an environmentally friendly technique to extract a very wide range of analytes. SPME fibers have some drawbacks that can be overcome by use of sol-gel nanosorbents. Therefore the aim of this study has been t...

G. Minak, H. Nosraty, M. M. Shokrieh, M. Tehrani-Dehkordi,

In this study, the tensile and compressive behaviors of pure and hybrid composite laminates reinforced by basalt–nylon bi-woven intra-ply fabrics were experimentally investigated. Epoxy resin was used as the matrix material. The purpose of using this hybrid composite is to obtain superior characteristics by using the good strength property of basalt fiber with the excellent toughness of ny...

Journal: :علوم و تکنولوژی پلیمر 0
شهره سادات محسنیان غلامرضا بخشنده قاسم نادری صدیقه سلطانی

acrylonitrile butadiene rubber (nbr) composites are prepared from waste nylon 66 short fiber using a two-roll mill mixer. the effects of fiber content and bonding agent on the mechanical and morphological properties of the composites are studied. the curing characteristics of the composites have been studied by using cure rheometer. the cure and scorch time of the composites decrease while cure...

Journal: :پژوهش های علوم دامی ایران 0
امیر سالاری نیا محمد حسن فتحی نسری همایون فرهنگ فر حسین نعیمی پور یونسی

this experiment was conducted to determine the effect of feeding alfalfa hay and starter fiber level on feed intake and performance of holstein dairy calves, using thirty two male calves in a completely randomized design assigned to four diets in a 2×2 factorial arrangement. the experimental treatments were as follow: t1: starter with low fiber and without alfalfa hay, t2: starter with low fibe...

amani pour, M R, mazaheri, A, nazari, B,

In this paper, the set-up of a multi-mode fiber optic sensor for measuring glucose in aqueous solutions is investigated and evaluated. The basis of this sensor is based on the Fresnel Reflection. In this setup, a helium-neon laser is used as a light source, a fiber optic probe, photocell as detector and a digital multimeter. The statistical analysis of the recorded data shows a highly linear be...

H. Ghiassian and G. R. Poorebrahim,

Triaxial consolidated drained, unconfined compression, and CBR tests have been conducted in order to study the stress-strain, strength, and volume change characteristics of fine sand specimens reinforced by polymeric fibers made from carpet wastes. The variables are aspect ratio (length/width) and weight percentage of the fibers. The results indicate that the peak strength and total volume chan...

A Zakery, A. C Brunetti, H Pakarzadeh, K Nielsen, K Rottwitt,

 A polymethylmethacrylate (PMMA) microstructured polymer optical fiber (mPOF) is fabricated and characterized. Using the cut-back technique the fiber loss is measured which is higher than the step-index silica fibers. Through a novel experimental scheme, the backward Stokes spectrum of the fabricated mPOF is recorded over a range exceeding 3000 cm‑1 during the cut-back method and compared ...

Journal: :Nippon Shokuhin Kagaku Kogaku Kaishi 2011

Journal: :acta medica iranica 0
gh. derakhshan deylami m.r. zahedpoor anaraki h. ghanaatti

3000 patients, having undergone fiber - optic bronchoscopy (foli) over 10 years, in our hospital were evaluated. thec aim of this study was to determine the prevalence of lung cancer in iran and their correlation with somking and to study the clinical anil radiological signs in different cancers ami the role of fiber-optic bronchoscopy in their diagnosis and the hazards of this method, 'llxe co...

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