نتایج جستجو برای: غشای pvc
تعداد نتایج: 6265 فیلتر نتایج به سال:
OBJECTIVES We sought to clarify the prevalence and characteristics of idiopathic ventricular tachycardia or premature ventricular contraction originating from the mitral annulus (MAVT/PVC). BACKGROUND Recent case reports have presented patients with MAVT/PVC. METHODS Electrocardiographic (ECG) characteristics and the results of electrophysiologic investigation and radiofrequency catheter ab...
OBJECTIVE Polyvinyl chloride (PVC) is commonly used as a catheter material in catheters for clean intermittent catheterization (CIC) but, owing mainly to environmental concerns, a PVC-free material has been proposed. The objective of this study was to compare patients' tolerability for catheters made of PVC and a newly developed PVC-free material. MATERIAL AND METHODS This was a prospective, ...
Three polyphosphates were used as inhibitors for poly(vinyl chloride) (PVC) photodegradation. The polyphosphates were added to PVC at a concentration of 0.5% by weight. The PVC films (40 µm thickness) were irradiated at room temperature with ultraviolet (UV) light for up to 300 h. The changes in PVC films after irradiation were monitored by Fourier transform infrared spectroscopy, weight loss, ...
اسیدهای آلی و نمکهای آنها به دلیل توانایی در جلوگیری از رشد میکروارگانیسمها درصنایع مواد غذایی، آرایشی و بهداشتی به طور گسترده مورد استفاده قرار میگیرند. یکی از این ترکیبها پتاسیم سوربات است. در این پژوهش مشخص شد که میتوان از ترکیب سوربات جیوه(Hg2(sorbate)2 ) (I) به عنوان یونوفر مناسب برای الکترود شناساگرغشایی بر پایه PVC حساس به یون سوربات در محیط آبی استفاده شود. پلی وینیل کلراید (Poly ...
در این پروژه با استفاده از کمپلکس بیس( متیل-سل) دی پروپیلن تری آمین مس(ii)[cu(me-sal)2dpt] به عنوان حامل خنثی در غشای pvc، الکترود حساس به یون تیوسیانات ساخته شد. درصد نسبی ترکیبات در غشای بهینه شده حاوی )3/30 5/58: 6/5: 6/5pvc/ :dbp:ionophore:mtoac ( است. الکترود تهیه شده دارای پاسخ نرنستی 5/60- در محدوده خطی m1-10×0/1-5-10×0/1، ناحیه ph کاربردی 5/10-5/3 ، زمان پاسخ دهی کمتر از 15 ثانیه و حد ...
Poly(vinyl chloride) resins are produced by four basic processes: suspension, emulsion, bulk and solution polymerization. PVC suspensions resins are usually relatively dust-free and granular with varying degrees of particle porosity. PVC emulsion resins are small particle powders containing very little free monomer. Bulk PVC resins are similar to suspension PVC resins, though the particles tend...
The ZnO sol well-crystallized was prepared by the sol-gel method. The ZnO films were coated on medical-grade PVC surface by the improved organic-inorganic interfacial adhesion method. The physical and photocatalytic properties of the samples were characterized by XRD, SEM, DRS spectra and measured by the photodegradation reaction of Rhodamine B (RhB) and anti-bacteria for Escherichia coli (E. c...
A study was carried out to characterize Ni-Co-PVC and Ni-Cu-PVC composite materials prepared by mechanical alloying technique (MAT) using SEM, EDS and electrochemical test. Composite materials were prepared by mixing together 95% of metal powder (Ni+Co or Ni+Cu) with 5% PVC. PVC was used as a binder and tetrahydrofuran (THF) was used as a solvent in composite material preparation. Based on the ...
Poly(vinyl chloride) (PVC) is a complex plastic system. Individual components of the PVC system, including residual vinyl chloride monomer (RVCM) and certain additives, may pose risks of harm to human health. There have been significant reductions in the RVCM content of PVC resin since 1974, reducing the cancer risk of workers in PVC fabrication plants and consumers of PVC products. A "no-effec...
The aim of this study was to validate in vivo the accuracy of a reconstruction-based partial volume correction (PVC), which takes into account the point spread function of the imaging system. The NEMA NU2 Image Quality phantom and five healthy volunteers (using [(11)C]flumazenil) were scanned on both HR+ and high-resolution research tomograph (HRRT) scanners. HR+ data were reconstructed using n...
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