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تعداد نتایج: 257408 فیلتر نتایج به سال:
A novel series of pyrazole derivatives containing imidazo[1,2-a]pyridine D1-D8 moiety has been synthesized. The reaction 2-aminopyridine with 4-phenylphenacyl bromide and 4-bromophenacyl gave the products A1, respectively. These then reacted DMF POCl3 to obtain new aldehyde B B1. two aldehydes were condensed various acetophenone substitutes yield corresponding chalcone C1-C10. Following this, c...
Different species of microbes form mixed-culture biofilms in cooling water systems. They cause microbiologically influenced corrosion (MIC) and biofouling, leading to increased operational and maintenance costs. In this work, two D-amino acid mixtures were found to enhance two non-oxidizing biocides [tetrakis hydroxymethyl phosphonium sulfate (THPS) and NALCO 7330 (isothiazoline derivatives)] a...
Measles virus (MV) causes small and large outbreaks in Iran. Molecular assays allow identifying and the sources of measles imported from neighboring countries. We carried out a phylogenetic analysis of measles virus circulating in Iran over the period 2010-2012. Specimens from suspected cases of measles were collected from different regions of Iran. Virus isolation was performed on urine and th...
BACKGROUND Intravenous fentanyl has been used for acute postoperative pain management, but has not always provided reliable adequate analgesia, including patient-controlled analgesia (PCA). The purpose of this study was to investigate the efficacy of time-scheduled decremental infusion of fentanyl for postoperative analgesia. METHODS Ninety-nine patients, aged 20-65 years, undergoing laparosc...
چکیده: بر اساس تئوری های اقتصادی یکی از عوامل موثر بر رشد اقتصادی، سرمایه گذاری است. شیوه های بسیاری برای تامین سرمایه وجود دارد که سرمایه گذاری مستقیم خارجی (fdi) یکی از مفیدترین آنها است. زیرا جریان ورودی fdi علاوه بر تامین سرمایه موجب انتقال تکنولوژی، ورود سرمایه انسانی متخصص، مدیریت و دانش می شود، لذا به منظور تحقق رشد اقتصادی مستمر و با ثبات ضروریست به صورت علمی به شناسایی عوامل موثر بر ...
Introduction In some biological, environmental or ecological studies, there are situations in which obtaining exact measurements of sample units are much harder than ranking them in a set of small size without referring to their precise values. In these situations, ranked set sampling (RSS), proposed by McIntyre (1952), can be regarded as an alternative to the usual simple random sampling ...
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