نتایج جستجو برای: microstructural changes

تعداد نتایج: 884191  

Journal: :international journal of iron & steel society of iran 2015
k. amini a. akhbarizadeh s. javadpour

deep cryogenic heat treatment is assumed as a supplementary heat treatment performed on steels before the finaltempering treatment to enhance the wear resistance and hardness of the steels. in this study, the effects of thedeep cryogenic heat treatment on the wear behavior and corrosion resistance of the 1.2080 tool steel were studiedusing the wear testing machine and polarization and impedance...

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Journal: :Journal of Applied Sciences 2001

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Journal: :Frontiers in neuroanatomy 2016
Lidia M. Nagae Justin M. Honce Jody Tanabe Erika Shelton Stefan H. Sillau Brian D. Berman

Diffusion tensor imaging (DTI) of the substantia nigra has shown promise in detecting and quantifying neurodegeneration in Parkinson disease (PD). It remains unknown, however, whether differences in microstructural changes within the basal ganglia underlie PD motor subtypes. We investigated microstructural changes within the basal ganglia of mild to moderately affected PD patients using DTI and...

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2011
A. Latif M. Khaleeq-ur-Rahman K. A. Bhatti M. S. Rafique Asma Hayat

The micro structural morphological investigations of the laser exposed samples of Platinum are presented. Q-Switched Nd: YAG laser (1064 nm, 1.1 MW, 9 14 ns) represented by Gaussian profile, power density 3 × 10 15 Watt/m 2 and focal spot size 12 μm is used to irradiate the targets (4 N, 1 × 1 × 0.3 cm 3 ). Surface modifications are observed and examined for optimized 50 pulses in air (1 atm) a...

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Journal: :E3S Web of Conferences 2020

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Journal: :PAMM 2009

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Journal: :Magnetic resonance in medicine 2017
Matt G Hall Chris A Clark

PURPOSE To investigate the sensitivity of diffusion-MR signal to microstructural change in muscle tissue associated with pathology, and recommend optimal acquisition parameters. METHODS We employ Monte-Carlo simulation of diffusing spins in hierarchical tissue to generate synthetic diffusion-weighted signal curves over a wide range of scan parameters. Curves are analyzed using entropy-a measu...

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Journal: :iranian journal of radiology 0
si shen medical imaging center, the first affiliated hospital of jinan university, jinan university, guangzhou, china hao wang pain clinic, the first affiliated hospital of jinan university, jinan university, guangzhou, china; pain clinic, the first affiliated hospital of jinan university, jinan university, guangzhou, china. tel: +86-13430267880, fax: +86-2038688416 jing zhang medical imaging center, the first affiliated hospital of jinan university, jinan university, guangzhou, china fei wang medical imaging center, the first affiliated hospital of jinan university, jinan university, guangzhou, china si-run liu medical imaging center, the first affiliated hospital of jinan university, jinan university, guangzhou, china

conclusion adc, fa, and t2* values may quantitatively reflect the microstructural characteristics of np, therefore they could be used to detect the minimal changes of early ldd. results the adc, fa, and t2* values were different (p < 0.05) among different rois within the same disc or among corresponding rois in different level discs. while the average values of adc increased regularly with the ...

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2016
Patrick Pietsch Daniel Westhoff Julian Feinauer Jens Eller Federica Marone Marco Stampanoni Volker Schmidt Vanessa Wood

Despite numerous studies presenting advances in tomographic imaging and analysis of lithium ion batteries, graphite-based anodes have received little attention. Weak X-ray attenuation of graphite and, as a result, poor contrast between graphite and the other carbon-based components in an electrode pore space renders data analysis challenging. Here we demonstrate operando tomography of weakly at...

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Journal: :AJNR. American journal of neuroradiology 2014
A Paydar E Fieremans J I Nwankwo M Lazar H D Sheth V Adisetiyo J A Helpern J H Jensen S S Milla

BACKGROUND AND PURPOSE Diffusional kurtosis imaging is an extension of DTI but includes non-Gaussian diffusion effects, allowing more comprehensive characterization of microstructural changes during brain development. Our purpose was to use diffusional kurtosis imaging to measure age-related microstructural changes in both the WM and GM of the developing human brain. MATERIALS AND METHODS Dif...

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