نتایج جستجو برای: آرایه میکروفونی ad

تعداد نتایج: 89325  

چکیده: در این مقاله ، طراحی ، شبیه سازی و ساخت یک آرایه آنتن با قطبشدایروی در باند s مورد بحث و بررسی قرار میگیرد. ویژگی آرایه طراحی شده، افزایش پهنای باند امپدانسی و نسبت محوری با استفاده از ساختار گردشی ترتیبی عناصر است. ساختار مذکور علاوه بر مزیت فوق باعث کاهش تزویج متقابل بین عناصر آرایه و تقارن الگوی تشعشعی میگردد. عناصر استفادهشده در آرایه، تکههای ریزنوار بیضوی شکل میباشند که روی زیر لایه...

ژورنال: :نشریه دانشکده فنی 2007
حمیدرضا بخشی آذر محمودزاده

در این مقاله ابتدا حد پایین برای واریانس خطای تخمین زاویه سیگنال دریافتی در آنتن های آرایه ای با استفاده از روش crb بررسی می شود. سپس با تعمیم آن، واریانس خطای تخمین زاویه سیگنال دریافتی در آنتن آرایه ای با دو زیرآرایه جداگانه محاسبه می گردد. مشاهده می شود که در یک آرایه، هر چه اندازه آرایه بزرگتر شود، دقت تخمین افزایش می یابد ولی قیمت آرایه و همچنین پیچیدگی سیستم نیز بالا می رود. به همین دلیل ...

2002
Akira Nakano Tsukasa Hirashima Akira Takeuchi

A learner who can solve a problem cannot always understand the problem adequately. In order to deeply understand a problem, it is necessary that he/she poses various problems which can be solved by the “solution method” of the problem. Moreover, after he/she poses problems, it is necessary that he/she considers and indicates differences between the problems posed by him/her, too. So, we develop...

2014
Alex Wade

Spanning 30 years and 40 individual videogames across a range of platforms, Pac-Man is one of the most recognizable of all videogame characters and a pop–culture icon. In spite of its widespread popularity, the game receives little sustained academic engagement or analysis. In an attempt to address this, the paper argues that in its classic iterations PacMan generates complex notions of space a...

1997
Stéphane Caro

Paralinguistics organizers such as parenthesis, footnotes, and pop-up fields on screen, should play an important role signalling the writer’s “minimization” intention when secondary points are concerned. This experiment investigated the role of pop-up fields compared to brackets in an information retrieval task. The results showed that, in this kind of task, putting secondary pieces of informat...

Journal: :Zootaxa 2013
Joanna Czaja

Mesothoracic wings have been examined and compared in 32 species representing 20 genera of Afrotropical Scutelleridae. Morphological characters of the corium are described. Three main types of mesothoracic wing venation patterns can be recognized. The taxonomic significance of forewing characters in Scutelleridae is briefly discussed.

2009
Özge Alaçam Mustafa Dalci

In this study, we aim to conduct usability tests on different WebMap sites with eye movement analysis. Overall task performance, the effects of iconic representation of information, and the efficiency of pop-up usage were evaluated. The eye tracking technology is used for this study in order to follow the position of the users’ eye-gaze. The results show that there are remarkable differences in...

2014
Chawadon Ketkaew Pittayawat Pittayaporn

The aim of this paper is to examine the parallelism between tonal transitions and musical note transitions in Thai pop songs based on the data from 30 current pop songs. The results suggest that there is a statistically significant parallelism between tonal transitions and musical note transitions. Interestingly, the results show that both contour tones, RISING and FALLING, typically pattern wi...

Z Eslami

Atopic dermatitis (AD) is a pruritic, relapsing, chronic disease that arises most commonly during infancy, childhood, or adolescence. It is clear that genetic factors are important in AD, a family history of AD, allergic rhinitis, and/or asthma and other “Atopic” phenomena being common in patient with AD. The two main pathogenetic characteristic of AD are: I) IgE-mediated antigen dependent “Spe...

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