钯金 palladium

Chinese Science Bulletin, 2018

Chinese Science Bulletin, 1996

SCIENTIA SINICA Physica, Mechanica & Astronomica

Dynamic behavior under cyclic loading conditions and creep behavior under quasi-static loading conditions were investigated by instrumented indentation of pure aluminum to reveal the influence of loading conditions (e.g., load, loading rate, and holding time) on indentation responses. The results of cyclic indentation show that, with the increase in the holding time, load, and loading rate of the pre-cyclic loading segment, the effect of creep on the subsequent cyclic indentation can be weakened, and the measured mechanical properties (e.g., contact depth, indentation hardness, and elastic modulus) can reach constant levels more rapidly with the increase in cycle number. The results of the creep tests show that the elastic modulus and indentation hardness decrease with the increase in holding time, the steady-state creep stress exponent obtained by instrumented indentation is independent of load, and a long holding time is not suggested for the creep tests. Indentation hardness and steady-state creep resistance measured within the inner grains are higher than those measured near the grain boundary regions.

马克西姆•阿梅林诗二十首 徐曼琳译, 2018

Chinese Science Bulletin, 2018

Journal of Inorganic Materials, 2010

Li 4 Ti 5 O 12 is the most potential candidate anode material of lithium-ion power battery for hybrid electric vehicles. In order to improve its rate performance, through doping and heat treatment on Li 4 Ti 5 O 12 with urea as nitrogen source, TiN high electrical conducting layer was prepared by in-situ selfgrowing on the surface of Li 4 Ti 5 O 12 particles. The crystalline structure, morphology, composition and electrochemical properties were studied by XRD, SEM, TEM, EDS, Raman spectra and half cell charge/discharge performance testing. The results show that nitridated Li 4 Ti 5 O 12 powers have the same diffraction peak positions of the spinel structure of Li 4 Ti 5 O 12 with pristine Li 4 Ti 5 O 12 , and it is observed the presence of nitrogen and Raman feature vibration bands of TiN in in-situ selfgrowing a homogeneously layer on the surface of Li 4 Ti 5 O 12 particles. The first discharge specific capacity of nitridated Li 4 Ti 5 O 12 samples slightly decreases than pristine Li 4 Ti 5 O 12 samples at 0.1C rate. However, the discharge specific capacity of the nitridated Li 4 Ti 5 O 12 samples is 1.6 times higher than that of the pristine Li 4 Ti 5 O 12 samples at 3C rate charge and discharge, and the capacity loss of them is only 3% at 0.1C rate after 100 cycle numbers. The results illuminate the nitridated Li 4 Ti 5 O 12 samples have good electrochemical rate performances and cycling behavior.

Chinese Science Bulletin, 2009

建筑发展 =, 2017

2016

Kexue tongbao, 2010