Results 41 to 50 of about 1,799,934 (343)

A robust method for estimating the two-phase flow rate of oil and gas using wellhead data

Journal of Petroleum Exploration and Production Technology, 2020
Flow rate prediction of multiphase flow in the oil and gas wellbores is more complicated than single-phase flow avoiding direct measurements such as using flowmeters or well logging. This study offers an approach to find the accurate two-phase flow rates,
Ehsan Khamehchi, Mohammad Zolfagharroshan, Mohammad Reza Mahdiani   +2 more
doaj   +1 more source

Ferroelectric phase transitions induced by a strain gradient

Physical Review Research, 2021
In perovskite oxide ferroelectrics, gradients of lattice strain are known to induce nanoscale topological structures, leading to novel or enhanced functionality.
P. Yudin, J. Duchon, O. Pacherova, M. Klementova, T. Kocourek, A. Dejneka, M. Tyunina   +6 more
doaj   +1 more source

Fourier domain preconditioned conjugate gradient algorithm for atmospheric tomography [PDF]

, 2006
By 'atmospheric tomography' we mean the estimation of a layered atmospheric turbulence profile from measurements of the pupil-plane phase (or phase gradients) corresponding to several different guide star directions.
Ellerbroek, Brent L., Vogel, Curtis R., Yang, Qiang   +2 more
core   +1 more source

Influence of ultra-low interfacial tension system on nonlinear seepage law of low permeability core

地质科技通报, 2021
The starting pressure gradient in low permeability reservoir leads to the nonlinear characteristics of fluid flow, which makes the development mode of low permeability reservoir different from that of medium and high permeability reservoir.In order to ...
Yujia Zeng, Chuanxiang Ouyang, Qingwei Zeng, Xinyu Li, Hongnan Zhao   +4 more
doaj   +1 more source

Phase coexistence of gradient Gibbs states

, 2005
We consider the (scalar) gradient fields $\eta=(\eta_b)$--with $b$ denoting the nearest-neighbor edges in $\Z^2$--that are distributed according to the Gibbs measure proportional to $\texte^{-\beta H(\eta)}\nu(\textd\eta)$.
A.C.D. Enter van, C.M. Fortuin, E.H. Lieb, G.R. Grimmett, H. Beijeren van, J. Fröhlich, J. Fröhlich, J. Fröhlich, J.R. Baxter, L. Chayes, M. Biskup, M. Biskup, M. Biskup, M. Biskup, Marek Biskup, R. Kotecký, R.G. Edwards, R.L. Dobrushin, Roman Kotecký, T. Funaki, Y. Velenik   +20 more
core   +2 more sources

Feasibility of Imaging Tissue Electrical Conductivity by Switching Field Gradients with MRI. [PDF]

, 2015
Tissue conductivity is a biophysical marker of tissue structure and physiology. Present methods of measuring tissue conductivity are limited. Electrical impedance tomography, and magnetic resonance electrical impedance tomography rely on passing external
Gibbs, Eric, Liu, Chunlei
core   +2 more sources

Phase manipulation in reflective phase gradient photonic crystals

Optics Express
Phase gradient photonic crystals (PGPCs) are proposed as promising candidates for phase manipulation and can enable arbitrary electromagnetic functions, such as deflection and focusing. In stark contrast to the proposed metasurfaces, the phase variation in PGPCs arises from simple edge-configuration rather than structure resonance.
Xiao Zhang, Jie Liu, Liang Liang, Li Liang, Fei-Fei Li, Yin Poo   +5 more
openaire   +2 more sources

A continuum theory of phase separation kinetics for active Brownian particles

, 2013
Active Brownian particles (ABPs), when subject to purely repulsive interactions, are known to undergo activity-induced phase separation broadly resembling an equilibrium (attraction-induced) gas-liquid coexistence.
Allen, Rosalind J., Cates, Michael E., Marenduzzo, Davide, Stenhammar, Joakim, Tiribocchi, Adriano   +4 more
core   +1 more source

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source

NIF optics phase gradient specfication [PDF]

, 1997
A root-mean-square (rms) phase gradient specification seems to allow a good connection between the NIP optics quality and focal spot requirements. Measurements on Beamlet optics individually, and as a chain, indicate they meet the assumptions necessary to use this specification, and that they have a typical rms phase gradient of {approximately}80 ...
Williams, W., Auerbach, J., Hunt, J., Lawson, L., Manes, K., Orth, C., Sacks, R., Trenholme, J., Wegner, P.   +8 more
openaire   +2 more sources