نتایج جستجو برای: Failure mode and effect analysis
تعداد نتایج: 17630875 فیلتر نتایج به سال:
fmea اختصار عبارت failure mode and effect analysis بوده و روشی فنی و مهندسی سیستماتیک برای شناسایی و پیشگیری از وقوع خطاها و ریسکهای بالقوه و بالفعل در سیستمها طراحی محصول و فرآیندهای تولید محصول و ارائه خدمات می باشد. تجزیه و تحلیل عوامل شکست در فرآیندهای تولید pfmea یکی از انواع fmea بوده و معمولا با انجام یافتن چند مرحله شامل بررسی شرایط محیطی ، نیروی انسانی ، روشهای انجام کا...
power transformers are important equipments in power systems. thus there is a large number of researches devoted of power transformers. however, there is still a demand for future investigations, especially in the field of diagnosis of transformer failures. in order to fulfill the demand, the first part reports a study case in which four main types of failures on the active part are investigate...
background: the reliability and safety of gas refineries are strongly associated with the reliability of other parts of the system. defect and failure in one part of a system can cause total system breakdown or accident. the failure and damage in these equipment such as transformers and boilers results in not only the equipment damage and human injuries but also productivity reduction. the purp...
در این رساله با به کارگیری فرآیند fmea (failure mode and effect analysis و با نگاهی چند جانبه و علت گرا ریشه های احتمالی خرابی یک پمپ گریز از مرکز با سرویس lpg مورد بررسی و مطالعه قرار گرفته است. ابتدا با جمع آوری و بررسی آمار خرابی 368 پمپ در یک دوره هشت ساله، پمپ با بیشترین آمار خرابی به عنوان یک نمونه مطالعاتی انتخاب شد و با بررسی مستندات مربوط به فعالیت های تعمیراتی پمپ مذکور، مشخص شد که...
prevention of medication errors in neonatal intensive care units (nicus) is of paramount importance due to age-specific and physiological conditions of neonates. this study aimed to evaluate the risk of medication prescription and administration via failure mode and effects analysis (fmea), which was carried out at the research and medical teaching center of imam reza hospital in mashhad, iran....
the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...
we have two part in this thesis, at first: the interaction of native calf thymus dna (ct-dna) with two anthraquinones including quinizarin (1,4- dihydroxy anthraquinone) and danthron (1,8- dihydroxy anthraquinone) in a mixture of 0.04 m brittone-robinson buffer and 50% of ethanol were studied at physiological ph by uv-vis absorption, florescence, circular dichroism spectroscopic methods, viscos...
in this thesis a calibration transfer method is used to achieve bilinearity for augmented first order kinetic data. first, the proposed method is investigated using simulated data and next the concept is applied to experimental data. the experimental data consists of spectroscopic monitoring of the first order degradation reaction of carbaryl. this component is used for control of pests in frui...
this study attempted to explore if teaching english collocations through two different modes of awareness-raising and input flooding has any possible differential effect on immediate retention as well as retention in a delayed assessment. it also compared the possible differential effect of teaching english collocations implicitly and explicitly on actively using the items in writing. m...
every year, many accidents leading to physical injuries in kindergartens, indicates that a very large percentage of them are related to the safety concerns and lack of hygiene in these places. families, due to their busy life style and working hours and also children needs of preschool education, are searching to find most suitable kindergartens for their children. selecting a kindergarten with...
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