نتایج جستجو برای: predominant frequency
تعداد نتایج: 525901 فیلتر نتایج به سال:
the present research was conducted to accomplish two purposes. firstly, it aimed to explore and describe schematic structure or what halliday and hassan (1989, p.64) have called “generic structure potential” (gsp) of american english, iranian persian and iranian english newspaper editorials within systemic functional linguistics. secondly, a quantitative cross-comparison was made to investigate...
a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...
X線 回折 法 に よる結 晶構 造 解 析 は,大 き さ0 .1 ~1mmの 単 結 晶 が あ れ ば ,原 子 の三 次 元 配 列 を 決 定 す る こ とが で き,原 子 間 距 離,結 合 角,配 位 数 な どの化 学 結 合 に 関 す る知 識 が 直 接 得 られ る非 常 に 優 れ た 方法 で あ る。 結 晶構 造 を決 定 す る過 程 は,次 の二 つ の段 階 に分 け られ る。 第1は ,単 結 晶 を 選 んで ワイ セ ンベ ル グ写 真 法 な どに よ って 晶 系,格 子 定 数,空 間 群 を 決 め,比 重 測 定 に よ って 単 位 格 子 内 の 化 学 単 位 数 を 決 定 す る過程 で あ る。 第2は,単 結 晶 のX線 回 折 強 度 か ら各原 子 の座 標 を 決 定 す る過 程 で あ る。 こ の過...
Background: irritable bowel syndrome (IBS) is a common functional bowel disorder characterized by abdominal pain and change in bowel movement. On the other hand, preterm labor (PL) is currently one of the most important problems in maternal-child health. The major causes of IBS are yet to be recognized, however some shared factors with PL have been proposed. It is probable that IBS patients are...
In this paper, the spectral ratio of mmicrotremor, HSVR, is presented for estimating the liquefaction potential of layered soil in the coastal area of the Persian Gulf, which consists of a hard sandstone layer situated between two saturated sandy layers. The surface layer is thin, with a thickness between 2 and 5 meters. The purpose of this paper is to identify the relation between the liquefac...
Abstract: Background and aims: Using water pump in residential buildings to provide the required water pressure is accompanied by noise pollution and the annoyance of residents. So, the purpose of this study is to reduce water pump noise pollution with designed acoustic curtains in a residential building of Qazvin city. Methods: The mean sound pressure level was measured before and ...
This paper describes a real-time method, called PreFEst (Predominant-F0 Estimation method), for estimating the fundamental frequency (F0) of simultaneous sounds in monaural polyphonic audio signals. Without assuming the number of sound sources, PreFEst can estimate the relative dominance of every possible harmonic structure in the input mixture. It treats the mixture as if it contains all possi...
Acipenser stellatus is one of the most invaluable species of Sturgeon fishes in the world. The purpose of this study was to identify the resident microbial community from the gastrointestinal tract (GIT) of Acipenser stellatus. One hundred and twenty three fungi were isolated from the GIT of 7 Acipenser stellatus samples including Aspergillus spp (45.5%), Trichoderma spp (8.9%) and Cladophialop...
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