نتایج جستجو برای: نوار بسامدی VHF
تعداد نتایج: 7738 فیلتر نتایج به سال:
شتاب‌دهنده‌های الکترونی توان متوسط کاربرد زیادی در صنعت پرتودهی دارند. برای پاسخگویی به نیاز صنعتهای کشور، پژوهشهای زیادی در زمینهی طراحی و ساخت شتابدهندهی خطی الکترون موج رادیویی توان متوسط در نوار بسامدی VHF با محدودهی انرژی MeV 1 تا MeV 5 در کشور آغاز شده است. یکی از مؤلفههای مهم این شتاب‌دهنده، کاواک آن است که در این مقاله نحوهی طراحی و ساخت آن و مقایسهی نتیجههای شبیه‌سازی...
تحلیل طیفی ابزاری مناسبی برای بررسی محتوای بسامدی داده‌های اقلیمی است. تحلیل طیفی محتوای بسامدی سری زمانی اقلیمی را براساس فرض ایستایی (بدون روند) سری زمانی فراهم می‌کند، اما، زمان دقیق محتوای بسامدی را نشان نمی‌دهد، در‌حالی‌که تجزیه طیفی زمان-بسامد یا تحلیل موجک، روش مفیدی برای تحلیل تغییرات موضعی در حوزه زمان-بسامد و تعیین دوره بازگشت پدیده‌های اقلیمی است. در این تحقیق تحلیل موجک برای بررسی ...
Skewing of the sex ratio towards males occurs among pups born to mice fed a very high saturated fat (VHF) diet. In the present study, we tested whether the fat content of the VHF diet rather than the number of calories consumed is responsible for this effect. Eight-week-old NIH Swiss mice were placed on the VHF diet either ad libitum (VHF) or in a restricted manner (VHF-R). The VHF-R mice gaine...
There are 4 families of viruses that cause viral hemorrhagic fever (VHF), including Filoviridae. Ebola virus is one virus within the family Filoviridae and the cause of the current outbreak of VHF in West Africa. VHF-endemic areas are found throughout the world, yet traditional diagnosis of VHF has been performed in large reference laboratories centered in Europe and the United States. The larg...
BACKGROUND Dietary interventions are critical in the prevention of metabolic diseases. Yet, the effects of fatty fish consumption on type 2 diabetes remain unclear. The aim of this study was to investigate whether a diet containing farmed salmon prevents or contributes to insulin resistance in mice. METHODOLOGY/PRINCIPAL FINDINGS Adult male C57BL/6J mice were fed control diet (C), a very high...
Viral haemorrhagic fevers (VHF) comprise a group of at least 13 diseases caused by viral infections which may produce severe haemorrhagic complications. VHF are distributed throughout much of the tropics and subtropics. The aetiological agents belong to various families of viruses and can be classified epidemiologically into 4 groups according to their modes Of transmission [5]. VHF are geograp...
Airborne synthetic aperture radar (SAR) operating in the VHF band and used in conjunction with change detection has shown promising results for wide-area surveillance of ground targets. By using VHF-band frequencies, both targets in the open as well as concealed by foliage may be detected in a robust manner. VHF-band SAR is able to detect hidden targets because both foliage attenuation and clut...
Using the MU radar at Shigaraki, Japan (34.85°N, 136.10°E), we measure the power distribution pattern of VHF radar echoes from the mid-troposphere. The large number of radar beam-pointing directions (320) allows the mapping of echo power from 0° to 40° from zenith, and also the dependence on azimuth, which has not been achieved before at VHF wavelengths. The results show how vertical shear of t...
INTRODUCTION There have been 3 outbreaks of viral hemorrhagic fever (VHF) in Uganda in the last 2 years. VHF often starts with non-specific symptoms prior to the onset of haemorrhagic signs. HIV clinics in VHF outbreak countries such as Uganda see large numbers of patients with HIV 1/2 infection presenting with non-specific symptoms every day. Whilst there are good screening tools for general h...
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