نتایج جستجو برای: large displacement

تعداد نتایج: 1078165  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اراک - دانشکده علوم 1393

فرض کنیم ‎ x ‎ و ‎ ‎y‎ ‎ فضاهای فشرده ی هاوسدورف باشند‏، ‎ ‎a‎ ‎ و ‎ ‎b‎ ‎ به ترتیب جبرهای یکنواخت بر ‎ ‎x‎ ‎ و ‎ ‎y‎ ‎ باشند‏‎a‎_{1}‎‎ ‎ یک زیر مجموعه ی ‎a‎ ‎ باشد و ‎ ‎ ho :‎ ‎a‎_{1} ‎ ightarrow ‎a‎ ‎‏،‎‏‎ ‎‎‎‎‎‏‎‎‎‎‎‎ au :‎ ‎a‎_{1}‎‎ ‎ ightarrow ‎a‎‎ ‎‎‎‏‏، ‎‎‎‎ s‎ :‎ ‎‎a‎_{1}‎‎ ‎ ightarrow ‎b‎‎ ‎ ‎ ‏و ‎ t‎ :‎ ‎‎a‎_{1} ‎ ightarrow b‎‎ ‎ ‎ نگاشت های باشند به طوری که‎$ ho(a‎_{1}‎)‎ ‎ ‎‎ و ‎ a...

Journal: :Physics in medicine and biology 2007
Hairong Shi Tomy Varghese

A large number of the strain estimation methods presented in the literature are based on the assumption of tissue continuity that establishes a continuous displacement field. However, in certain locations in the body such as the arteries in vivo scanning may produce displacement fields that are discontinuous between the two walls of the artery. Many of the displacement or strain estimators fail...

Journal: :Magnetic resonance in medicine 2009
Bradley J Roth Peter J Basser

Allen Song and coworkers recently proposed a method for MRI detection of biocurrents in nerves called "Lorentz effect imaging." When exposed to a magnetic field, neural currents are subjected to a Lorentz force that moves the nerve. If the displacement is large enough, an artifact is predicted in the MR signal. In this work, the displacement of a nerve of radius a in a surrounding tissue of rad...

Journal: :Physical review letters 2010
Bo Wang Juan Guan Stephen M Anthony Sung Chul Bae Kenneth S Schweizer Steve Granick

Using single-molecule fluorescence imaging, we track Brownian motion perpendicular to the contour of tightly entangled F-actin filaments and extract the confining potential. The chain localization presents a small-displacement Hookean regime followed by a large amplitude regime where the effective restoring force is independent of displacement. The implied heterogeneity characterized by a distr...

2008
William Mackaness Ross Purves

Displacement is one of a number of methods used to improve the legibility of symbolised features in a map. In this paper a number of alternate paradigms for displacement are considered and compared. It is apparent that effective displacement can be achieved by sharing small movements among a group of objects in order to minimise loss of positional accuracy and maintain the gestalt and topology ...

Journal: :Physical review letters 2012
Brian Edwards Nader Engheta

Electric displacement current is present in capacitors and optical waveguides; however, unlike the conduction current in metallic wires, it is not confined. Analogous to the contrast in conductivity between a metallic wire and the surrounding air, displacement-current wires based on near-zero permittivity media contain a large contrast in effective permittivity. As a variation on this idea, in ...

2016
Faming Huang Kunlong Yin Tao He Chao Zhou Jun Zhang

Subject review The developmental tendencies of cumulative displacement time series associated with reservoir landslides influenced by large water reservoirs must be effectively predicted. However, traditional methods do not encompass the dynamic response relationships between landslide deformation and its influencing factors. Therefore, a new approach based on the exponential smoothing (ES) and...

Journal: :پژوهش های ایران شناسی 0
محمد باقر وثوقی دانشیار گروه تاریخ دانشگاه تهران

the foremost constant and incessant social development in history of persian gulf is “immigration and population displacement” at both sides of this region. this phenomenon is so important that no one may comprehend properly the events and incidents occurred in this region particularly at pre- petroleum exploration regardless of investigation and considering this issue in mind. if we divide per...

2015
Adam D. Gepner Laura A. Colangelo Nicole Reilly Claudia E. Korcarz Joel D. Kaufman James H. Stein Xiao-Feng Yang

BACKGROUND Associations between carotid artery longitudinal displacement, cardiovascular disease risk factors, and events were evaluated in a large, multi-ethnic cohort. MATERIALS AND METHODS A novel, reproducible protocol was developed for measuring right common carotid artery longitudinal displacement using ultrasound speckle-tracking. Total longitudinal displacement was measured in 389 ran...

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