نتایج جستجو برای: instantaneous dose rate

تعداد نتایج: 1241918  

2016
Nabeel Ahmad Yann Le Bouar Christian Ricolleau Damien Alloyeau

Studying dynamical processes by transmission electron microscopy (TEM) requires considering the electron-irradiation history, including the instantaneous dose rate and the cumulative dose delivered to the sample. Here, we have exploited liquid-cell TEM to study the effects of the electron-irradiation history on the radiochemical growth of dendritic Au nanostructures. Besides the well-establishe...

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2008
James Harrington

1 The Problem of Instantaneous Rates of Change The concept of the instantaneous rate of change of some physical quantity, position most strikingly, poses a significant philosophical dilemma. Notoriously, Zeno argued, in his arrow paradox, that the very concept of an instantaneous rate of change in position is both unavoidable in the explanation of motion and incoherent. Recently worries about i...

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2013
Seth Uretsky Farooq A Chaudhry Linda Gillam Srinivasa Gurram Sri Lakshmi Kala Bonda Harikrishna Ponnam Eric Bader Naganath Thota Randy Cohen Azhar Supariwala Steven D Wolff

BACKGROUND The systolic variation of mitral regurgitation (MR) is a pitfall in its quantification. Current recommendations advocate using quantitative echocardiographic techniques that account for this systolic variation. While prior studies have qualitatively described patterns of systolic variation no study has quantified this variation. METHODS This study includes 41 patients who underwent...

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Journal: :Cancer 2006

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Journal: :Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians 2004
Mingxia Zhu Michael J Collins D Robert Iskander

To investigate fluctuations in the wavefront aberrations of the eye and their relation to pulse and respiration frequencies we used a wavefront sensor to measure the dynamics of the Zernike aberrations up to the polynomial fourth radial order. Simultaneously, the subject's pulse rate was measured, from which the instantaneous heart rate was derived. We used an auto-regressive process to derive ...

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Journal: :Journal of Radiation Research 1979

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Journal: :Acta Radiologica 1960

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Journal: :Turkish Journal of Oncology 2019

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Journal: :Translational Andrology and Urology 2018

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Journal: :Mathematics and Computers in Simulation 2009
M. Ubukata Masaru Fukushige

Many variations exist of yield curve modeling based on the exponential components framework, but most do not consider the generating process of the error term. In this paper, we propose a method of yield curve estimation using an instantaneous error term generated with a standard Brownian motion. First, we add an instantaneous error term to Nelson and Siegel’s instantaneous forward rate model [...

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