Polycrystalline TiN/TaN multilayers were grown by reactive magnetron sputtering on WC-Co sintered hard alloy Substrates. Multilayer structure and composition modulation amplitudes were studied using X-ray diffraction ...Polycrystalline TiN/TaN multilayers were grown by reactive magnetron sputtering on WC-Co sintered hard alloy Substrates. Multilayer structure and composition modulation amplitudes were studied using X-ray diffraction method. Hardness and elastic modulus were measured by nanoindentation tester. For A>8.0 nm, hardness is lower than rule-of mixtures value of individual single layer, and increased rapidly with decreasing A, peaking at hardness values≈33% higher than that at A=4.3 nm. As a result of analysing the inclination of applied load for indenter displacement on P-h curve (△P/△h), this paper exhibits that the enhancement of the resistance to dislocation motion and elastic anomaly due to coherency strains are responsibie for the hardness change展开更多
Objective To study the mechanism of myocardial dielectric property changes in radio frequency during hypothermic preservation and explore myocardial viability evaluative method. Methods Hybrid young pigs ( 20 - 30 kg)...Objective To study the mechanism of myocardial dielectric property changes in radio frequency during hypothermic preservation and explore myocardial viability evaluative method. Methods Hybrid young pigs ( 20 - 30 kg) were used in the experiment. Heart arrest was in-展开更多
文摘Polycrystalline TiN/TaN multilayers were grown by reactive magnetron sputtering on WC-Co sintered hard alloy Substrates. Multilayer structure and composition modulation amplitudes were studied using X-ray diffraction method. Hardness and elastic modulus were measured by nanoindentation tester. For A>8.0 nm, hardness is lower than rule-of mixtures value of individual single layer, and increased rapidly with decreasing A, peaking at hardness values≈33% higher than that at A=4.3 nm. As a result of analysing the inclination of applied load for indenter displacement on P-h curve (△P/△h), this paper exhibits that the enhancement of the resistance to dislocation motion and elastic anomaly due to coherency strains are responsibie for the hardness change
文摘Objective To study the mechanism of myocardial dielectric property changes in radio frequency during hypothermic preservation and explore myocardial viability evaluative method. Methods Hybrid young pigs ( 20 - 30 kg) were used in the experiment. Heart arrest was in-
