نتایج جستجو برای: back lobe suppression
تعداد نتایج: 316925 فیلتر نتایج به سال:
هدف از این پایان نامه طراحی، شبیه سازی و ساخت آنتن آرایه ای شکافی با استفاده از ebg (باند ممنوعه الکترومغناطیسی) برای کاهش تزویج متقابل در باند x است و از قطعات تجاری موجود در بازار ایران استفاده شده است. متوقف کردن امواج سطحی روی آنتن، ایجاد توزیع میدان یکنواخت در زیرلایه موجبری یکپارچه (siw)، افزایش بهره آنتن و کاهش تزویج متقابل بین عناصر تشعشعی مهمترین موضوع در طراحی آنتن های آرایه ای است. د...
This work studies the influence of phoretic motion (thermophoresis and diffusiophoresis) fine alumina particles (“smoke”) produced during combustion aluminum. Direct numerical simulations on a single aluminum droplet burning in quiescent environment suggest that thermophoresis is main mechanism driving smoke back to surface, hence major contributor oxide lobe development. The presence this foun...
Digital Signal Processing techniques for ground surveillance RADAR has been thoroughly investigated and optimized for an improved detection of target. Using the established techniques like Pulse compression, Fast Fourier Transform and Windowing, the present work optimizes the selection of pulse coding techniques, window type and different filters.The work proposes techniques to mitigate inheren...
A comprehensive review on the approaches for synthesizing low side lobe concentric ring array (CRA) antennas is given. An Iterative Convex Optimization (ICO) based layout synthesis technique proposed peak side-lobe level (PSLL) minimization over a given circular field-of-view in steerable uniform-amplitude (UA-CRA) antennas. For number of rings and uniformly-distributed elements each ring, ICO ...
A 63 years old woman with Hashimoto's thyroiditis, on thyroxin treatment presented imaging studies concordant with a multinodular goiter, a "hot" nodule in the left lobe and partial suppression of the right lobe. After thyroxin withdrawal overt hypothyroidism developed, yet the patient's imaging studies were not altered. This is a case of hypothyroidism in a patient with Hashimoto's thyroiditi...
A statistical multi-lobe approach was recently introduced in order to efficiently handle layered materials rendering as an alternative expensive general-purpose approaches. However, this poorly supports scattering volumes the method does not account for back-scattering and resorts single approximations. In paper, we address these limitations with efficient solution based upon a transfer matrix ...
We have previously shown that urocortin 2 (Ucn 2), a member of the corticotropin-releasing factor (CRF) peptide family that binds to CRF type 2 receptor, is expressed in proopiomelanocortin (POMC) cells of rat pituitary and that its secretion and expression are increased by CRF in both the anterior and intermediate lobes and suppressed by glucocorticoids in the anterior lobe. We have also shown...
Although the prevailing opinion is that emotional processes are influenced by sex hormones, the literature is still inconclusive. The aim of the current study was to examine the effects of gonadal suppression on brain activity during affective picture processing. Twenty-one female-to-male (FtM) transsexuals and 19 control women were recruited and underwent functional magnetic resonance imaging ...
Monotone noises at high decibels have been identified as a main cause of degradation in people’s mental health. This paper proposes directional monotone noise reduction method to suppress spatially localized single-frequency noises. The system is designed based on feedforward active control (ANC) structure by implementing filtered-x least mean square (FxLMS) algorithms. Compared with traditiona...
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