نتایج جستجو برای: retrieval
تعداد نتایج: 83283 فیلتر نتایج به سال:
objective : in this study, the effects of estradiol valerate and raloxifenea selective estrogen receptor modulator; (serm) on morphine induced sensitization were examined in mice memory, according to the step-down passive avoidance task. method: the mice received morphine or estradiol and raloxifene for three days alone or in combination with morphine. after a drug free period of 5 days, the su...
background sildenafil (viagra) has been introduced to treat erectile dysfunction by acting as phosphodiesterase 5 inhibitor and hence accumulation of guanosine cyclic monophosphate (cgmp). on the other hands, the nitric oxide/cgmp signaling pathway has crucial role in synaptic plasticity processes like long-term potentiation (ltp) in the central nervous system considered as a model of learning ...
Introduction: Previous studies have indicated that stress levels of glucocorticoid hormones induce impairment of long term memory retrieval, but the underlying mechanisms (genomic or non-genomic) are not clear. To clarify this issue, we investigated the involvement of brain corticosteroid receptors and protein synthesis in the glucocorticoid-induced impairment of memory retrieval. Methods: 140 ...
ضرورت چندرسانه ای، دسترسی به آرشیوهای دیجیتال بزرگ و رشد سریع www اخیراً باعث شده است که تلاشهای تحقیقاتی وسیعی در جهت ایجاد ابزاری برای بازیابی موثر پایگاه داده تصویر برانگیخته شود. بازیابی تصویر برپایه محتوا (cbir) از محتوای قابل رویت یک تصویر مثل رنگ، شکل، بافت و ... برای شاخص گذاری و ارایه تصویر استفاده می کند. بدلیل وجود بافتهای بسیار زیاد در طبیعت، بافت، یک روش شاخص گذاری مهم تصاویر می باش...
Background: Alzheimer disease is the main cause of dementia in middle-aged and elderly people. Considering the improving effects of creatine supplementation on cognitive performance, this study aimed to determine the effects of creatine supplementation on learning, memory, and apoptosis in an experimental model of Alzheimer’s disease. Methods: Thirty-two male Wistar rats each weighing 250±50...
In this article a pre-processing method is introduced which is applicable in speech recognized texts retrieval task. We have a text corpus, t generated from a speech recognition system and a query as inputs, to search queries in these documents and find relevant documents. A basic problem in a typical speech recognized text is some error percentage in recognition. This, results erroneously ass...
Abstract: The purpose of this study was to apply recurrence plots on event related potentials (ERPs) recorded during memory recognition tests. EEG signals recorded during memory retrieval in four scalp region were used. Two most important ERP’s components corresponding to memory retrieval, FN400 and LPC, were detected in recurrence plots computed for single-trial EEGs. In addition, the RQA was ...
Purpose: Since information storage and retrieval is among fundamental tasks of libraries and information dissemination centers, finding proper software in this field is of high significance. The purpose of the present study is to evaluate web-based librarianship software Pars azarakhsh, Nosa, and Namayeh in information retrieval. Methodology: The present study is an applied one. Its methodolog...
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