نتایج جستجو برای: مخلوط های sma
تعداد نتایج: 499709 فیلتر نتایج به سال:
آتروفی نخاعی-ماهیچه ای (sma) یکی از بیماری های شایع عصبی-ماهیچه ای، همراه با فلج پیشرونده است که به علت ضایعاتی در نورون حرکتی آلفا در نخاع ایجاد می شود. sma توسط دو ژن smn1 و smn2 بیان می شود که تنها در اگزون شماره 7 خود در یک نوکلئوتید متفاوت هستند. شایع ترین جهش دیده شده حذف هوموزیگوس اگزون 7 در ژن smn1 است. درصد کمی از بیماران هتروزیگوسیتی مرکب با جهش نقطه ای در یک آلل و حذف در آلل دیگر دار...
This paper presents a shape memory alloy (SMA) ac-tuator aimed to be integrated in the phalanx of a dex-terous micro-gripper. Its original design mechanically decouples motion transmission from force transmission. After a brief discussion on the operating principles of the actuator, the kinematics of the mechanism and its general features are speciied. A thermo-mechanical model of the SMA bers ...
In this paper, a modular microactuator based on shape memory alloy (SMA) actuation to drive the joints of a microgripper is described. Its design is a combination of two SMA actuators installed on the links of a special mechanism : one of them drives the rotation of the joint and the other one produces the necessary force to manipulate objects. An accurate model of the thermo-mechanical behavio...
Two general models with hierarchical and almost degenerate neutrino masses, which are able to explain the solar and atmospheric anomalies are investigated. We show how neutrinoless double beta decay experiments discern Dirac and Majorana natures of neutrinos. The strongest result is, that almost degenerate neutrinos with masses above 0.22 eV combined with the SMA MSW must be Dirac particles. In...
The SMN1 and NAIP genes are related to the development of spinal muscular atrophy (SMA), which is characterized by degeneration of motor neurons leading to progressive muscular weakness and atrophy. The SMN1 gene is homozygously deleted in most SMA patients, and now recognized as a responsible gene for SMA. The NAIP gene is often deleted in the SMA patients with the severest form of SMA, and no...
This study presents a new approach to control the nonlinear dynamics of an adaptive absorber using shape memory alloy (SMA) element. Shape memory alloys are classified as smart materials that can remember their original shape after deformation. Stress and temperature-induced phase transformations are two typical behaviors of shape memory alloys. Changing the stiffness associated with phase tran...
In this research, the response of fixed offshore platforms equipped with shape memory alloy elements at the different depths under extreme wave loading are taken into account. For this purpose platforms located in different water depths 70, 110 and 150 has been considered. At first for evaluation of the nonlinear behavior of three platforms, pushover analysis using SACS has been engaged. Then n...
مقاومت لغزندگی بر اساس تعریف به معنای نیروی بازدارنده و مقاومی است که توسط اندرکنش بین روسازی و چرخ قفل شده ایجاد میشود. مخلوطهای با استخوانبندی سنگدانهای1 (SMA)، مخلوطهای آسفالتی گرمی میباشند که به دلیل وجود درصد بیشتری از مصالح سنگی درشت دانه مقاومت بالایی در برابر لغزندگی دارند. با توجه به اهمیت استفاده از مخلوطهای SMA به عنوان یک لای...
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