نتایج جستجو برای: Torque

تعداد نتایج: 21520  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده برق و کامپیوتر 1386

کیفیت گشتاور یک موتور سنکرون مغناطیس دایم داخلی نسبت به برخی از پارامترهای ابعاد رتور حساس است و این حساسیت می تواند برای کاهش cogging torque و نوسان گشتاور موتور استفاده شود. از آنجا که یک قسمت از نوسان گشتاور،cogging torque است، در این پایان نامه، یک روش جدید برای کاهش cogging torque با استفاده از مدل مغناطیسی ساده شده موتور انجام می شود. نتایج روش جدید منجر به شکل دهی جدید air bridge و موتور...

Journal: :journal of dental materials and techniques 0
hamidreza hamidreza rajatihaghi dental research center, assistant professor of prosthodontics department, faculty of dentistry, mashhad university of medical sciencesسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) jalil jalil ghanbarzadeh dental research center, associate professor of prosthodontics department, faculty of dentistry, mashhad university of medical sciencesسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) neda neda daneshsani faculty of dentistry, mashhad university of medical sciences, mashhad, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) sahebalam sahebalam rasul sahebalam dental research center, assistant professor of pediatrics department, faculty of dentistry, mashhad university of medical sciencesسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) nakhaee nakhaee mohammadreza mohammadreza nakhaee dental research center, assistant professor of prosthodontics department, faculty of dentistry, mashhad university of medical sciencesسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences)

introduction: the purpose of this study was to compare the accuracy of the torque wrenches used in different dental implant systems. methods: we evaluated 42 torque wrenches used in different dental clinics in mashhad, iran, using a digital torque meter (mark 10). high (25, 30 and 35 n·cm) and low (15 n·cm) levels of torque were examined. ten tests were performed on each wrench, and the mean va...

Journal: :journal of dental materials and techniques 0
jalil jalil ghanbarzadeh 1department of prosthodontics, faculty of dentistry, mashhad university of medical sciences, mashhad, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) mahboobeh mahboobeh rajabzadeh departments of periodontics, school of dentistry, isfahan university of medical sciences,isfahan, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی اصفهان (isfahan university of medical sciences) mohammadreza mohammadreza nakhaei dental research center, faculty of dentistry, mashhad university of medical sciences,mashhad, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) hamidreza hamidreza rajatihaghi dental material research center, faculty of dentistry, mashhad university of medical sciences, mashhad, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) niloufar niloufar tayarani najjaran 1department of prosthodontics, faculty of dentistry, mashhad university of medical sciences, mashhad, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences)

introduction: some clinicians use a handheld screw driver instead of a torque wrench to definitively tighten abutment screws. the aim of this study was to compare the removal torque of one-piece and two-piece abutments tightened with a handheld driver and a torque control ratchet. methods: 40 iti implants were placed in acrylic blocks and divided into 4 groups. in groups one and two, 10 iti one...

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...

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...

Journal: :iranian journal of science and technology (sciences) 2008
sh kaboli

the efficiency of induction motors decreases at light loads. efficiency optimizer control systemsadjust the motor flux value to achieve the best efficiency in a wide range of load variations. reduced fluxoperation has some other benefits such as power factor improvement and torque ripple reduction. the latter isan important issue in a direct torque controlled induction motor drive. in this pape...

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