scholarly journals Influence of nacre thickness and crystal structure characteristics on interference color and luster of cultured Akoya pearl

2021 ◽  
Author(s):  
HIDEO AOKI ◽  
MICHIO SUZUKI ◽  
SHINJI TANAKA ◽  
TAKASHI ATSUMI ◽  
SHIGEKI NAKAUCHI ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Characteristics ◽  
Interference Color

Crystal structure characteristics, intrinsic properties, and vibrational spectra of non-stoichiometric Ca1+xWO4 ceramics

2018 ◽  
Vol 124 (4) ◽  
pp. 044104 ◽  
Author(s):  
Jianzhu Li ◽  
Jing Wang ◽  
Guangen Fu ◽  
Chao Xing ◽  
Xunqian Yin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Vibrational Spectra ◽  
Intrinsic Properties ◽  
Structure Characteristics

scholarly journals Features of Structural, Electrokinetic and Energy State Characteristics of V x+yCo1-ySb3 Skutterudite

2017 ◽  
Vol 18 (3) ◽  
pp. 328-333
Author(s):  
L.P. Romaka ◽  
Yu.V. Stadnyk ◽  
V.А. Romaka ◽  
A.M. Horyn
Keyword(s):  
Crystal Structure ◽  
Electrical Resistivity ◽  
Thermal Energy ◽  
Energy State ◽  
Electrical Energy ◽  
Structural Defects ◽  
Structure Characteristics ◽  
Impurity Atoms ◽  
Concentration Dependences ◽  
Thermopower Coefficient

The structure characteristics, temperature and concentration dependences of the electrical resistivity and the thermopower coefficient for the Vx+yCo1-ySb3 skutterudite were investigated in the ranges: T = 80 - 400 K, x = 0.02 - 0.20. It was shown that the introduction of V atoms into the structure of CoSb3 thermoelectric material was accompanied by an increase in the efficiency of conversion of thermal energy into electrical energy. It was established that the inversion in the sign of the thermopower coefficient for Vx+yCo1-ySb3 not observed for these concentrations of V impurity atoms. Based on the analysis of electrokinetic and energy state characteristics of Vx+yCo1-ySb3, it was assumed that the V (3d34s2) impurity atoms simultaneously replaced Co (3d74s2)atoms, generating structural defects of acceptor nature, and were located in the icosahedral voids of the crystal structure and generated donors. 

Frictional Performance of Brake Pads against Al Metal Matrix Composites with Different Sizes of SiC Particles

2007 ◽  
Vol 336-338 ◽  
pp. 1743-1745
Author(s):  
Shao Yang Zhang ◽  
Fu Ping Wang
Keyword(s):  
Crystal Structure ◽  
Friction Coefficient ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Elevated Temperatures ◽  
Matrix Composites ◽  
Brake Pads ◽  
Structure Characteristics ◽  
Large Size ◽  
Frictional Performance

Two drums suitable for a Chase Machine were made of Al metal matrix composites containing 25vol.% SiCp with 3.5 μm and 34 μm in nominal diameter respectively. The same brake pads were measured on the Chase Machine installing each individual drum. It has been found that the brake pads had better frictional performance and wear resistance against the drum with the large-size SiCp than against the drum with the small-size ones. Friction fade took place at elevated temperatures - above 316 oC, but the original level of friction coefficient could be regained rapidly upon cooling with regard to the latter. The minor level of friction coefficient was attributable to soft Al crystal structure characteristics and thick tribofilms during the testing stages.

Backgrounds for the Industrial Use of Black Tourmaline Based on Its Crystal Structure Characteristics

2008 ◽  
Vol 377 (1) ◽  
pp. 107-119 ◽  
Author(s):  
F. S. Lameiras ◽  
E. H. M. Nunes ◽  
J. Maria Leal
Keyword(s):  
Crystal Structure ◽  
Structure Characteristics ◽  
Industrial Use
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