In this article the description of some types of spatial gear constraints (spur gears, bevel gears, etc.) in absolute coordinates is considered. Instead of the numerical expensive calculation of constraint Jacobian matrix we propose to use the transformed Jacobian matrix, which can be calculated much more efficiently. The proposed methods of description of gear constraints were implemented for ...

یکی از عوامل محرک برای ایجاد جریان محوری درون روتور سانتریفیوژ به منظور افزایش عملکرد جداسازی، اسکوپ است. با توجه قرار گرفتن در معرض گاز ماخ بالا، دچار شوک شده و گرادیان‌های شدیدی اتفاق خواهد افتاد. این پژوهش اطراف حالت دوبعدی (r-θ) روش شبیه­سازی مستقیم مونت‌کارلو (DSMC) استفاده حل­گر dsmcFoam فواصل مختلف دیواره شبیه‌سازی نتایج نشان می‌دهد که فاصله کاهش زاویه برخورد اسکوپ، سبب بیشینه دما نیروی ...

During routine nasal intubation of a premature infant, the endotracheal tube penetrated the brain. Bloodstained cerebrospinal fluid and neural tissue was apparent. Initial cranial sonography was normal, but the infant later developed extensive intracranial haemorrhage. Rotation of an endotracheal tube to facilitate insertion angles the bevel at the tip upwards, increasing risk of brain penetrat...

Precise placement and steering of surgical needles is very important for many medical diagnostic and therapeutic procedures. But accurate steering and placement of needles in soft tissue is challenging because of a variety of reasons. In this study we focused on the effects of tip geometry (bevel tip, diamond tip, and conical tip) of brachytherapy needles while inserted in soft material phantom...

The aim of this study is to evaluate the effect of super finishing on gear acceleration and noise level. Many researchers [1-13] have studied the gear dynamic models to study the effect of various parameters on gear dynamics. A 6DOF model is developed and experimental studies were conducted. In this study, the effects of super finishing [14, 15] on gear acceleration and noise level were evaluat...

This study examined the effect of four margin designs on marginal adaptation of Captek crowns during selected processing steps. Twenty-four Captek crowns were fabricated, six each of four margin designs: shoulder (Group A), chamfer (Group B), chamfer with bevel (Group C), and shoulder with bevel (Group D). Marginal discrepancies between crowns and matching dies were measured at selected points ...

Magnetic gear mechanisms have advanced to a promising future in transmission technology. Previous research indicates that magnetic might replace mechanical some applications. Small-scale wind turbines (SWT) with counter-rotating rotors were initially fitted by bevel gears are proposed be replaced coaxial train (CMGT). The CMGT is intended for use as speed multiplier order obtain maximum power a...