نتایج جستجو برای: pitch
تعداد نتایج: 21473 فیلتر نتایج به سال:
because of fluctuation in leg tension, pitch motion is very effective fatigue and life safety of leg elements in tension leg structures (tlss). in this paper an exact solution for pitch vibration of a tls interacting with ocean wave is presented. the legs of tlp are considered as elastic springs. the flow is assumed to be irrotational and single-valued velocity potentials are defined. the effec...
این پایان نامه یک تکنیک جدید برای تخمین سرعت باد با استفاده از شبکه عصبی پیشنهاد می دهد، به این صورت که تلفات سیستم توربین بادی با یک روش جدید برای تخمینگر عصبی سرعت باد مدل می شوند. ابتدا عملکرد دو نوع تخمینگر عصبی سرعت باد 1) شبکه عصبی پیش خور پرسپترون چند لایه(mlp) 2) شبکه عصبی پس خور انعکاس حالت (esn) برای کنترل حداکثر نقطه توان توربین بادی بدون سنسور برای دو حالت 1) بدون در نظر گرفتن جریان...
On August 7, 2003 the Cluster spacecraft moved through the dayside magnetosphere. The energetic particle spectrometer on board Cluster provided measurements of an extensive range of energy. Besides, satellite measurements of geomagnetic field showed a gradient magnetic field. It is known that an inhomogeneity of the magnetic field leads to a drift of charged particles. In this paper, the drift ...
Orthodontic miniscrews are widely used as temporary anchorage devices to facilitate orthodontic movements. Miniscrew loosening is a common problem, which usually occurs during the first two weeks of treatment. Macrodesign can affect the stability of a miniscrew by changing its diameter, length, thread pitch, thread shape, tapering angle and so on. In this study, a 3-D finite element analysis wa...
Pitch control is one of t he major aspects of wind turbine control, particularly over high wi nd s p e e d a n d oscillations. General El e c t r i c (GE) model of wi n d t ur bi ne i s practically compatible with the structure of the wind turbines. I t h a s b e e n p r o v e d t h a t simulation results using this model are closer to the actual case, compared to other available mod...
Background: Prospectively electrocardiography (ECG)-triggered high-pitch spiral coronary computed tomography angiography (CCTA) is a unique scan mode for dual-source CT (DSCT). Our reports aim to compare image quality and radiation dose of CCTA using high-pitch spiral or sequential acquisition mode in patients with low and stable heart rates. Materials and Methods: Patients with low and stable ...
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