نتایج جستجو برای: resistivity methods

تعداد نتایج: 1885204  

Journal: :IEEE Trans. Instrumentation and Measurement 1998
Tuqiang Xie Swee Chuan Tjin Qingping Yang Seng Lee Ng

Blood resistivity is an important quantity whose value influences the results of various methods used in the study of heart and circulation. In this paper, the relationship between blood resistivity and velocity of blood flow was evaluated and analyzed based upon a probe using six-ring electrodes and a circulatory model. The experimental results indicated that the change in blood resistivity wa...

2016
James K. Glasbrenner Kirill D. Belashchenko Josef Kudrnovsky Sergii Khmelevskyi V. Drchal Iljan Turek

First-principles study of spin-disorder resistivity of heavy rare-earth metals: Gd–Tm series" (2012). Kirill Belashchenko Publications. 11. Electrical resistivity of heavy rare-earth metals has a dominant contribution from thermal spin-disorder scattering. Here this spin-disorder resistivity is calculated for the Gd-Tm series of metals in the paramagnetic state. Calculations are performed withi...

Journal: :Circulation. Arrhythmia and electrophysiology 2014
Paramdeep S Dhillon Rasheda A Chowdhury Pravina M Patel Rita Jabr Aziz U Momin Joshua Vecht Rosaire Gray Alex Shipolini Christopher H Fry Nicholas S Peters

BACKGROUND The relative roles of the gap-junctional proteins connexin40 (Cx40) and connexin43 (Cx43) in determining human atrial myocardial resistivity is unknown. In addressing the hypothesis that changing relative expression of Cx40 and Cx43 underlies an increase in human atrial myocardial resistivity with age, this relationship was investigated by direct ex vivo measurement of gap-junctional...

2015
M. Sadouki M. Fellah

An acoustic method is proposed for measuring the flow resistivity and the thickness of air-saturated porous materials. The conventional methods [14, 16, 17] for the measurement of the flow resistivity (or the viscous permeability) require the prior knowledge of the porosity. The method presented in this work is based on a temporal model of the direct problem in which a simplified expression (in...

Electrical resistivity (ER) is a main parameter in the melting processes of glasses. However, its measurement is difficult at high temperatures. In this study the electrical resistivity of different cordierite glass samples in the molten state was measured in the temperature range of 1100˚C to 1550 ˚C using the two-wire method. It was attempted to decrease the electrical resistivity of the glas...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم انسانی 1387

چکیده: بررسی ادبیات مربوطه در کشور در زمینه یادگیری زبان انگلیسی نشان می‎دهد که علی‎رغم اهمیت املا در فرآیند یادگیری به طور عام و یادگیری زبان انگلیسی به طور خاص، این مولفه از جایگاهی متناسب با اهمیت آن برخوردار نیست و عمدتاً نادیده گرفته شده است. تحقیقات گسترده‎ای در خارج از کشور در مورد ماهیت این مولفه صورت گرفته است، در حالی که به جرأت می‎توان گفت در داخل کشور گامی در مورد درک ماهیت آن و فرآی...

2012
S.P.S. Matharu S. Sanyal

Sound working of transmitting power is very essential. For immaculate working of the machines, bearings play an important and critical role. Standard monitoring methods of performance evaluation of rolling element bearings with high degree of reliability are yet to be explored. Authors have proposed rolling element bearing test rig for the same [3]. The formulation requires essentially the elec...

Journal: :AJNR. American journal of neuroradiology 1994
B Goraj S Rifkinson-Mann D R Leslie T A Lansen S S Kasoff M S Tenner

PURPOSE To investigate the usefulness of transcranial Doppler ultrasonography in the evaluation of intracranial pressure changes after head injury. METHODS Transcranial Doppler examinations and intracranial pressure measurements using intraparenchymal monitors were performed in 12 cases of closed head injury. Twenty-four sets of data, including the Glasgow Coma Scale, intracranial pressure, t...

Journal: :فیزیک زمین و فضا 0
محمد شاهی فردوس دانشجوی دکتری اکتشاف معدن، دانشگاه صنعتی امیر کبیر، تهران، ایران محمد بیچرانلو حسن دانشجوی کارشناسی ارشد اکتشاف معدن، دانشگاه صنعتی سهند، ایران راشد پورمیرزائی دانشجوی دکتری، دانشگاه صنعتی سهند، تبریز، ایران

resistivity and induced polarization methods are used in exploration of porphyry metals for years. the resistivity method is used in the study of horizontal and vertical discontinuities in the electrical properties of the ground. the induced polarization method makes use of the capacitive action of the subsurface to locate zones where conductive minerals are disseminated within their host rocks...

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