This paper proposes the continuous controller design method for quantum Shannon entropy, which can continuously drive the entropy to track a desired trajectory. We also analyzed the controllability of Shannon entropy ...This paper proposes the continuous controller design method for quantum Shannon entropy, which can continuously drive the entropy to track a desired trajectory. We also analyzed the controllability of Shannon entropy in very short time interval. Simulations are done on five dimensional quantum system, which can verify the validation of the method.展开更多
伴随着大数据和计算社会科学的兴起,计算传播学在一定程度上代表了传播学在数字化时代学科范式的转型。计算传播学的学科渊源主要来自于数据科学、网络科学以及传播学。本研究从5W的视角对计算传播学的研究文献进行了综述,并在CNKI中以...伴随着大数据和计算社会科学的兴起,计算传播学在一定程度上代表了传播学在数字化时代学科范式的转型。计算传播学的学科渊源主要来自于数据科学、网络科学以及传播学。本研究从5W的视角对计算传播学的研究文献进行了综述,并在CNKI中以“计算传播”和“计算传播学”作为中文关键词进行检索,在Web of Science中以“Computational Communication”和“Computational Communication Research”为英文关键词进行检索,对检索所得文献进行主题建模分析,试图更全面地呈现计算传播学研究的版图。本研究还进一步探讨了计算传播学未来研究需要关注的重点议题,除了需要对计算传播学的元理论进行深入思考外,也特别建议研究者在采用计算传播视角开展研究时立足于中国社会的具体语境探究重大现实议题。展开更多
By observing the microstructure evolution of Mg-Ga alloy during tensile deformation, it is found that the prismatic slip and the pyramidal <c+a> slip occur during the tensile process at room temperature, which ...By observing the microstructure evolution of Mg-Ga alloy during tensile deformation, it is found that the prismatic slip and the pyramidal <c+a> slip occur during the tensile process at room temperature, which finally leads to the plenty of dislocation accumulation. After 8% tensile deformation,the {1012} extension twin is the main way to coordinate the strain in the c-axis direction for the alloy with the Ga content lower than 2 wt.%, but the pyramidal <c+a> slip is the main way to coordinate the strain along the c-axis direction for the alloy with the Ga content higher than 2 wt.%. The Ga addition can promote the activation of the non-basal slip, which is beneficial to the work-hardening of the alloy to achieve better plasticity. Dynamic precipitation can slightly reduce the increment of dislocations.The preparation method of high strain rate rolling(HSRR) is another important reason for the plasticity of magnesium alloy sheets, and it is an important embodiment of the application of the dislocation engineering concept in magnesium alloy. The non-basal dislocations derived from the HSRR deformation can provide the non-basal dislocation sources when magnesium alloy is deformed at room temperature,resulting in good ductility. This study can be used as a reference for preparing wrought magnesium alloy with high strength and high plasticity by Ga alloying and hot deformation.展开更多
文摘This paper proposes the continuous controller design method for quantum Shannon entropy, which can continuously drive the entropy to track a desired trajectory. We also analyzed the controllability of Shannon entropy in very short time interval. Simulations are done on five dimensional quantum system, which can verify the validation of the method.
文摘伴随着大数据和计算社会科学的兴起,计算传播学在一定程度上代表了传播学在数字化时代学科范式的转型。计算传播学的学科渊源主要来自于数据科学、网络科学以及传播学。本研究从5W的视角对计算传播学的研究文献进行了综述,并在CNKI中以“计算传播”和“计算传播学”作为中文关键词进行检索,在Web of Science中以“Computational Communication”和“Computational Communication Research”为英文关键词进行检索,对检索所得文献进行主题建模分析,试图更全面地呈现计算传播学研究的版图。本研究还进一步探讨了计算传播学未来研究需要关注的重点议题,除了需要对计算传播学的元理论进行深入思考外,也特别建议研究者在采用计算传播视角开展研究时立足于中国社会的具体语境探究重大现实议题。
基金financially supported by the National Natural Science Foundation of China (no. 51871093)the Natural Science Foundation of Hunan Province, China (no. 2019JJ40044)。
文摘By observing the microstructure evolution of Mg-Ga alloy during tensile deformation, it is found that the prismatic slip and the pyramidal <c+a> slip occur during the tensile process at room temperature, which finally leads to the plenty of dislocation accumulation. After 8% tensile deformation,the {1012} extension twin is the main way to coordinate the strain in the c-axis direction for the alloy with the Ga content lower than 2 wt.%, but the pyramidal <c+a> slip is the main way to coordinate the strain along the c-axis direction for the alloy with the Ga content higher than 2 wt.%. The Ga addition can promote the activation of the non-basal slip, which is beneficial to the work-hardening of the alloy to achieve better plasticity. Dynamic precipitation can slightly reduce the increment of dislocations.The preparation method of high strain rate rolling(HSRR) is another important reason for the plasticity of magnesium alloy sheets, and it is an important embodiment of the application of the dislocation engineering concept in magnesium alloy. The non-basal dislocations derived from the HSRR deformation can provide the non-basal dislocation sources when magnesium alloy is deformed at room temperature,resulting in good ductility. This study can be used as a reference for preparing wrought magnesium alloy with high strength and high plasticity by Ga alloying and hot deformation.
