Results 41 to 50 of about 37,512 (168)

Correction methods for acoustic anisotropy of bedding shale

Youqicang pingjia yu kaifa, 2020
The physical and mechanical properties of bedding shales show strong anisotropy, which leads to the significant difference in the logging response of the same formation between the vertical wells and the horizontal wells, and bringing the difficulties in
LI Xiansheng, LIU Xiangjun, LIANG Lixi, LI Wei, GAO Yang, XIONG Jian   +5 more
doaj  

Apparent diffusion coefficient and fractional anisotropy of newly diagnosed grade II gliomas [PDF]

NMR in Biomedicine, 2009
AbstractDistinguishing between low‐grade oligodendrogliomas (ODs) and astrocytomas (AC) is of interest for defining prognosis and stratifying patients to specific treatment regimens. The purpose of this study was to determine if the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) from diffusion imaging can help to differentiate ...
Inas S, Khayal, Tracy R, McKnight, Colleen, McGue, Scott, Vandenberg, Kathleen R, Lamborn, Susan M, Chang, Soonmee, Cha, Sarah J, Nelson   +7 more
openaire   +2 more sources

Anisotropy interpretation and the coherence research between resistivity and acoustic anisotropy in tight sands

Petroleum Exploration and Development, 2020
Aiming at the problem of anisotropy inversion of tight sands, a new method for extracting resistivity anisotropy from array laterolog and micro-resistivity scanning imaging logging is proposed, and also the consistency of electric and acoustic anisotropy
Chaoliu LI, Chao YUAN, Xia LI, Zhou FENG, Lianteng SONG, Lei WANG   +5 more
doaj   +1 more source

Phase-Field Simulation for Non-isothermal Solidification of Al-Cu Binary Alloy [PDF]

Materials Research, 2019
Based on the principle of dilute solution approximation, a phase field model for dendritic growth during the non-isothermal solidification process was proposed by coupling the phase field, concentration field and temperature field, and was adopted to ...
Liu Guangguang, Luo Sen, Wang Zhaohui, Wang Weiling, Zhu Miaoyong, Wang Xiaohua   +5 more
doaj   +1 more source

Numerical Simulations on the Front Motion of Water Permeation into Anisotropic Porous Media

Geofluids, 2019
Water permeation into a porous medium is a common but important phenomenon in many engineering fields such as hydraulic fracturing. The water permeation front moves with time and may significantly impact the field variable evolution near the water front.
Xiangxiang Zhang, J. G. Wang, Xiaolin Wang, Feng Gao   +3 more
doaj   +1 more source

Diffusion tensor tractography as a supplementary tool to conventional MRI for evaluating patients with myelopathy

The Egyptian Journal of Radiology and Nuclear Medicine, 2014
Purpose: The aim of this study was to assess the clinical utility of DTI including apparent diffusion coefficient (ADC), fractional anisotropy (FA), in patients with symptoms of spinal cord myelopathy. Patients and methods: Fifteen subjects with clinical
Amal Amin A. El Maati, Nivine Chalabi
doaj   +1 more source

Anisotropy characteristics of microstructures for bone substitutes and porous implants with application of additive manufacturing in orthopaedic

Materials & Design, 2020
Porous bone substitutes built with additive manufacturing provide an opportunity for mimicking natural bone with complicated structures and excellent properties.
Jianfeng Kang, Enchun Dong, Dichen Li, Shuangpeng Dong, Chen Zhang, Ling Wang   +5 more
doaj   +1 more source

Love wave dispersion in anisotropic visco-elastic medium

Annals of Geophysics, 1978
The paper presents a study on Love wave propagation in a anisotropic<br />visco-elastic layer overlying a rigid half space. The characteristic frequency<br />equation is obtained and the variation of the wave number with frequency<br /> ...
G. GIR SUBHASH, V. GAUR
doaj   +1 more source

Anisotropy of a Tensorial Bishop’s Coefficient for Wetted Granular Materials

Journal of Engineering Mechanics, 2017
The objective of this research is to use grain-scale numerical simulations to analyze the evolution of stress anisotropy exhibited in wetted granular matter. Multiphysical particulate simulations of unsaturated granular materials were conducted to analyze how the interactions of contact force chains and liquid bridges affect macroscopic responses under
Wang, Kun, Sun, WaiChing
openaire   +3 more sources

Joint factor of basalt and its relationship with strength and deformation characteristics

Yantu gongcheng xuebao
The joint density, joint inclination angle and joint roughness are the three key factors that control the mechanical response of basalts. Based on the 3D printing technology, the uniaxial compression and interfacial shear tests are carried out to deeply ...
KONG Yang 1, RUAN Huaining 2, ZHANG Guirong 1, HE Ning 1, WANG Zhangchun 1
doaj   +1 more source