نتایج جستجو برای: hydrodynamic torque

تعداد نتایج: 46093  

Journal: :journal of dentistry, tehran university of medical sciences 0
aboulfazl saboury dental research center, research institute of dental sciences of shahid beheshti university of medical sciences, tehran, iran ; associate professor, department of prosthodontics, dental school, shahid beheshti university of medical sciences, tehran, iran. seyed jalil sadr ali fayaz minoo mahshid

high variability in delivering the target torque is reported for friction-style mechanical torque limiting devices (f-s mtlds). the effect of aging (number of use) on the accuracy of these devices is not clear. the purpose of this study was to assess the effect of aging on the accuracy (±10% of the target torque) of f-s mtlds.fifteen new f-s mtlds and their appropriate drivers from three differ...

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی مشهد - دانشکده دندانپزشکی 1391

مقدمه و هدف شل شدن پیچ اباتمنت همواره از معضلات ترمیم های متکی بر ایمپلنت بوده است. از آنجایی که در مراحل کلینیکی بعضی از دندانپزشکان با استفاده از آچار دستی و بدون استفاده ازratchet torque control اقدام به محکم کردن اجزاء ایمپلنت می کنند و نیز میزان اعمال نیرو به روش دستی در دندانپزشکان مختلف متفاوت است ، لازم است در این موارد از میزان محکم شدن ایمپلنت مطمئن شویم. هدف این مطالعه بررسی نیروی...

Journal: :journal of dentistry, tehran university of medical sciences 0
mahmood kazemi assistant professor, department of prosthodontics, faculty of dentistry, tehran university of medical sciences, tehran, iran. ahmad rohanian abbas monzavi mohammad sadegh nazari

accurate delivery of torque to implant screws is critical to generate ideal preload in the screw joint and to offer protection against screw loosening. mechanical torque-limiting devices (mtlds) are available for this reason. in this study, the accuracy of one type of friction-style and two types of spring-style mtlds at baseline, following fatigue conditions and sterilization processes were de...

2009
Andy Robinson Andy Knott

− This paper gives details of a round robin torque comparison involving the National Physical Laboratory (NPL) and nine other UK laboratories. The comparison covered two ranges: 20 N·m to 100 N·m and 200 N·m to 1 kN·m. The work was an effective way of disseminating the unit of torque to industry via the UK’s new national torque standard, giving assurance to laboratories and customers and identi...

Journal: :Physical review fluids 2022

We show that a microswimmer trapped thermodynamically at fluid-fluid interfaces experiences torque arising from the hydrodynamic boundary condition interface. This turns force dipoles corresponding to pullers perpendicular and pushers parallel demonstrate in general case, when there is viscosity contrast across interface, steady state orientation given by interplay between torques self-propulsi...

2013
Pavel Kuzhir Cécilia Magnet Georges Bossis Alain Meunier Victor Bashtovoi P. Kuzhir G. Bossis

Synopsis This paper is focused on the theoretical modeling of the rheological properties of the magnetic suspensions in shear flows under an external magnetic field aligned with the streamlines. The conventional theory postulates that the field-induced aggregates of magnetic particles are highly anisotropic and aligned with the flow direction. Therefore, no substantial variation in suspension v...

2003
T. Okamoto A. Jenkins V. R. Eke V. Quilis C. S. Frenk

We investigate the evolution of angular momentum in Smoothed Particle Hydrodynamic (SPH) simulations of galaxy formation, paying particular attention to artificial numerical effects. We find that a cold gas disc forming in an ambient hot gas halo receives a strong hydrodynamic torque from the hot gas. By splitting the hydrodynamic force into artificial viscosity and pressure gradients, we find ...

2009
Li Tao Dai Ming Lin Jing Zhang Yue Zhang Zhimin

− This paper describes the development of torque standard machines in China, its measurement range and its measurement uncertainty information etc. Also, the situation of torque standard machines which are in building process or will be built in the future is described in this document. In 1970’s, the first standard machine for measuring torques was developed in Shanghai and it initiated the hi...

2010
Courtney D. Hall Marjorie H. Woollacott Jody L. Jensen

Background. One ofthe key components ofpostural control is the motor system's ability to produce appropriate torques to counteract perturbations that may lead to a loss of balance. Evidence exists to show that there is an age-related decline in absolute strength and in the ability to rapidly produce torque. The relationship between age-related decreases in these voluntary torque production capa...

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