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力学理论的矢量分析力学方法 被引量:2
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作者 贾利群 张耀宇 +1 位作者 刘沛龙 陈向炜 《江南大学学报(自然科学版)》 CAS 2007年第5期614-618,共5页
综合矢量力学和分析力学理论的优点,给出用分析力学变量表示的位矢、速度、加速度以及质点的矢量分析动力学方程,探讨一种新的处理力学问题的矢量分析力学方法.该方法的主要特点是:直观、物理图像清晰,在各种坐标系中有统一的运动学方... 综合矢量力学和分析力学理论的优点,给出用分析力学变量表示的位矢、速度、加速度以及质点的矢量分析动力学方程,探讨一种新的处理力学问题的矢量分析力学方法.该方法的主要特点是:直观、物理图像清晰,在各种坐标系中有统一的运动学方程和动力学方程,便于引进分析力学变量,适宜处理复杂的、多约束力学体系的力学问题. 展开更多
关键词 自由度 分析力学变量 广义加速度 矢量分析运动学 矢量分析力学
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Precipitation kinetics of NZ30K-Mg alloys based on electrical resistivity measurement 被引量:1
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作者 王小娜 韩利战 顾剑锋 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第6期1690-1697,共8页
The electrical resistivity of NZ30K-Mg alloy was measured at different heating rates during continuous heating to stud the precipitation kinetics.Two kinds of metastable phases,β" and β',formed during the heating.... The electrical resistivity of NZ30K-Mg alloy was measured at different heating rates during continuous heating to stud the precipitation kinetics.Two kinds of metastable phases,β" and β',formed during the heating.Kissinger method and differentia isoconversional method were employed to assess the precipitation kinetic parameters of NZ30K-Mg alloy,activation energy Eα an pre-exponential factor A'α.The fraction of transformation(α) and the precipitation sequence in NZ30K-Mg alloy were determinec Continuous heating transformation(CHT) and isothermal heating transformation(IHT) diagrams were further obtained for guidin the aging of NZ30K-Mg alloy.The analysis shows that the precipitation kinetic parameters of NZ30K-Mg alloy can be obtaine accurately using isoconversional method. 展开更多
关键词 NZ30K-Mg alloy precipitation kinetics differential isoconversional method continuous heating transformation isothermal heating transformation
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Exact Invariants and Adiabatic Invariants of Nonholonomic Variable Mass Systems
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作者 陈向炜 梅凤翔 《Journal of Beijing Institute of Technology》 EI CAS 2001年第2期131-137,共7页
By the theory of symmetries and conserved quantities, the exact invariants and adiabatic invariants of nonholonomic variable mass systems are studied. The perturbation problem of symmetries for the nonholonomic variab... By the theory of symmetries and conserved quantities, the exact invariants and adiabatic invariants of nonholonomic variable mass systems are studied. The perturbation problem of symmetries for the nonholonomic variable mass systems under small excitation is discussed. The concept of high order adiabatic invariant is presented, and the form of exact invariants and adiabatic invariants as well as the conditions for their existence are given. Then the corresponding inverse problem is studied. 展开更多
关键词 analytical mechanics variable mass PERTURBATION adiabatic invariant
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LASER SPECTRAL ANALYSIS OF STRAIN MEASUREMNT
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作者 姜耀东 陈至达 《Journal of China University of Mining and Technology》 1994年第1期100-111,共12页
Modern opticai theory has shown that the far field or Fraunbofer diffraction equipment is identical to the Fourier spectral analyzer. In the Fourier speetral analyzer the Fourier spectra or the Fraunhofer diffaction p... Modern opticai theory has shown that the far field or Fraunbofer diffraction equipment is identical to the Fourier spectral analyzer. In the Fourier speetral analyzer the Fourier spectra or the Fraunhofer diffaction pattern of a graph is formed on the back focal plane when a laser beam is directed on the graph lying on the front foeal plane ; the Fourier spectra of the graph is also subjected to change during the deformation of the graph. Through analyzing the change of Fourier spectra the deformation of the graph can be obtained. A few years ago,based on the above principles the authors proposed a new technique of strain measurement by laser spectral analysis. Demonstration and discussion will be made in detail in this paper. 展开更多
关键词 GRATINGS strain measurement Laser spectrum
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