The thermodynamical properties of MgCl_2 in KCI-MgCl_2-LiCl molten electrolytes containing MgCl_2 below 0.5 (mole fraction, the same below) have been determined from the interchange energies of two binary systems KCI...The thermodynamical properties of MgCl_2 in KCI-MgCl_2-LiCl molten electrolytes containing MgCl_2 below 0.5 (mole fraction, the same below) have been determined from the interchange energies of two binary systems KCI-MgCl_2 and LiCI-MgCl_2, by means of a model on the assumptions that the electrolytes in the solution are treated as independent particles instead of their ion forms and the interchange energy between the component pair KCI-LiCl is ignored when compared with those of component pairs KCl-MgCl_2 and MgCl_2-LiCl. The interchange energies, wKCl-MgCl_2 and wMgcCl_2-Licl, are obtained as-70000 and -13800 J.mol-1, from the corresponding binary solutions, respectively.展开更多
网络时代的学习,走向联通,而贯彻这一学习理念的重要举措之一,就是设计与关联学习相契合的在线课程。基于这一设计理念,以cMOOCs实践形态为个案构建的线课程设计框架模型,结合了关联主义学习特点,充分体现了知识社区与探究(Knowledge Co...网络时代的学习,走向联通,而贯彻这一学习理念的重要举措之一,就是设计与关联学习相契合的在线课程。基于这一设计理念,以cMOOCs实践形态为个案构建的线课程设计框架模型,结合了关联主义学习特点,充分体现了知识社区与探究(Knowledge Community and Inquiry,KCI)模型的相关思路与方法。该教学法实践的结果表明:可动态生成基于共享知识库的关联学习课程生态,体现了学习者的知识创造、网络连接等关联学习的典型特征,并且基于群体知识创造动态生成的共享知识库,具有认知复杂性和认知科学性等特点,学习者的学习满意度较高。因此,该设计框架模型,可望为关联学习以及在线开放课程的开发,提供新思路。展开更多
McCullagh-Barreto key agreement protocol and its variant achieve perfect forward security and key generation center （KGC） forward security, but provide no resistance to key compromise impersonation attack （KCI att...McCullagh-Barreto key agreement protocol and its variant achieve perfect forward security and key generation center （KGC） forward security, but provide no resistance to key compromise impersonation attack （KCI attack）. In this paper, we give a formal treatment of key compromise impersonation （KCI） attack and define the security notion against it. Then an variant of McCullagh-Barreto protocol is presented with only one more Hash operation. The improved protocol preserves perfect forward security and KGC forward security, and furthermore is proved to be secure against KCI attack under k-Gap-BCAA1 assumption.展开更多
Now the radial distribution function is often used to describe the structure of molten salt solution. This one-dimensional statistic description is an effective method even though it can only give limited information....Now the radial distribution function is often used to describe the structure of molten salt solution. This one-dimensional statistic description is an effective method even though it can only give limited information. The radial distribution function is mainly obtained in experiment by the diffraction method. The structures of pure molten salt solutions have展开更多
基金National Natural Science Foundation of China!No.59774028
文摘The thermodynamical properties of MgCl_2 in KCI-MgCl_2-LiCl molten electrolytes containing MgCl_2 below 0.5 (mole fraction, the same below) have been determined from the interchange energies of two binary systems KCI-MgCl_2 and LiCI-MgCl_2, by means of a model on the assumptions that the electrolytes in the solution are treated as independent particles instead of their ion forms and the interchange energy between the component pair KCI-LiCl is ignored when compared with those of component pairs KCl-MgCl_2 and MgCl_2-LiCl. The interchange energies, wKCl-MgCl_2 and wMgcCl_2-Licl, are obtained as-70000 and -13800 J.mol-1, from the corresponding binary solutions, respectively.
文摘网络时代的学习,走向联通,而贯彻这一学习理念的重要举措之一,就是设计与关联学习相契合的在线课程。基于这一设计理念,以cMOOCs实践形态为个案构建的线课程设计框架模型,结合了关联主义学习特点,充分体现了知识社区与探究(Knowledge Community and Inquiry,KCI)模型的相关思路与方法。该教学法实践的结果表明:可动态生成基于共享知识库的关联学习课程生态,体现了学习者的知识创造、网络连接等关联学习的典型特征,并且基于群体知识创造动态生成的共享知识库,具有认知复杂性和认知科学性等特点,学习者的学习满意度较高。因此,该设计框架模型,可望为关联学习以及在线开放课程的开发,提供新思路。
基金supported by the National Natural Science Foundation of China(60773003,60603010)the Natural Science Foundation of Shaanxi Province(2006F19)
文摘McCullagh-Barreto key agreement protocol and its variant achieve perfect forward security and key generation center （KGC） forward security, but provide no resistance to key compromise impersonation attack （KCI attack）. In this paper, we give a formal treatment of key compromise impersonation （KCI） attack and define the security notion against it. Then an variant of McCullagh-Barreto protocol is presented with only one more Hash operation. The improved protocol preserves perfect forward security and KGC forward security, and furthermore is proved to be secure against KCI attack under k-Gap-BCAA1 assumption.
基金Project supported by the National Natural Science Foundation of China
文摘Now the radial distribution function is often used to describe the structure of molten salt solution. This one-dimensional statistic description is an effective method even though it can only give limited information. The radial distribution function is mainly obtained in experiment by the diffraction method. The structures of pure molten salt solutions have
