منابع مشابه
Strategies for obtaining unpublished drug trial data: a qualitative interview study
BACKGROUND Authors of systematic reviews have difficulty obtaining unpublished data for their reviews. This project aimed to provide an in-depth description of the experiences of authors in searching for and gaining access to unpublished data for their systematic reviews, and to give guidance on best practices for identifying, obtaining and using unpublished data. METHODS This is a qualitativ...
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This paper first examines the problems of using impact methods to achieve fast fracture of polymers. On-specimen gauges are employed to obtain the distribution of transient and other stresses in different parts of the specimen. A new method is then introduced that avoids transient forces and achieves crack velocities in small specimens of tough polymers of over 300 m s-l. It provides for the me...
متن کاملislanding detection methods for microgrids
امروزه استفاده از منابع انرژی پراکنده کاربرد وسیعی یافته است . اگر چه این منابع بسیاری از مشکلات شبکه را حل می کنند اما زیاد شدن آنها مسائل فراوانی برای سیستم قدرت به همراه دارد . استفاده از میکروشبکه راه حلی است که علاوه بر استفاده از مزایای منابع انرژی پراکنده برخی از مشکلات ایجاد شده توسط آنها را نیز منتفی می کند . همچنین میکروشبکه ها کیفیت برق و قابلیت اطمینان تامین انرژی مشترکان را افزایش ...
15 صفحه اولStatistical Analysis Methods for the fMRI Data
Functional magnetic resonance imaging (fMRI) is a safe and non-invasive way to assess brain functions by using signal changes associated with brain activity. The technique has become a ubiquitous tool in basic, clinical and cognitive neuroscience. This method can measure little metabolism changes that occur in active part of the brain. We process the fMRI data to be able to find the parts of br...
متن کاملSearching for unpublished data for Cochrane reviews: cross sectional study
OBJECTIVE To describe the experiences of authors of Cochrane reviews in searching for, getting access to, and using unpublished data. DESIGN Cross sectional study. SETTING Cochrane reviews. PARTICIPANTS 2184 corresponding authors of Cochrane reviews as of May 2012. MAIN OUTCOME MEASURE Frequencies of responses to open ended and closed questions in an online survey. RESULTS Of 5915 aut...
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ژورنال
عنوان ژورنال: Cochrane Database of Systematic Reviews
سال: 2011
ISSN: 1465-1858
DOI: 10.1002/14651858.mr000027.pub2