For the first time,the MgH_(2)–NaAlH_(4)(ratio 4:1)destabilized system with CoTiO_(3) addition has been explored.The CoTiO_(3)-doped MgH_(2)–NaAlH_(4) sample begins to dehydrogenate at 130℃,which is declined by 40...For the first time,the MgH_(2)–NaAlH_(4)(ratio 4:1)destabilized system with CoTiO_(3) addition has been explored.The CoTiO_(3)-doped MgH_(2)–NaAlH_(4) sample begins to dehydrogenate at 130℃,which is declined by 40℃ compared to the undoped MgH_(2)–NaAlH_(4).Moreover,the de/rehydrogenation kinetics characteristics of the CoTiO_(3)-doped MgH_(2)–NaAlH_(4) were greatly ameliorated.With the inclusion of CoTiO_(3),the MgH_(2)–NaAlH_(4) composite absorbed 5.2 wt.%H_(2),higher than undoped MgH_(2)–NaAlH_(4).In the context of dehydrogenation,the CoTiO_(3)-doped MgH_(2)–NaAlH_(4) sample desorbed 2.6 wt.%H_(2),almost doubled compared to the amount of hydrogen desorbed from the undoped MgH_(2)–NaAlH_(4) sample.The activation energy obtained by the Kissinger analysis for MgH_(2) decomposition was significantly lower by 35.9 kJ/mol than the undoped MgH_(2)–NaAlH_(4) sample.The reaction mechanism demonstrated that new phases of MgCo and AlTi_(3) were generated in situ during the heating process and are likely to play a substantial catalytic function and be useful in ameliorating the de/rehydrogenation properties of the destabilized MgH_(2)–NaAlH_(4) system with the inclusion of CoTiO_(3).展开更多
LiAIH4 doped with Ni and Ce（SO4）2 additives and the effect of doping on temperature and hydrogen release were studied by pressure-content-temperature （PCT） experiment and X-ray diffraction （XRD） analysis. It is ...LiAIH4 doped with Ni and Ce（SO4）2 additives and the effect of doping on temperature and hydrogen release were studied by pressure-content-temperature （PCT） experiment and X-ray diffraction （XRD） analysis. It is indicated that doping with Ni induces a significant decrease in temperature in the first step and LiA1H4 doped with 1mol% Ni presents the most absorption of hydrogen. Doping with Ce（S04）2 also causes a marked decrease, while the amount of hydrogen release changes only slightly. The results from X-ray diffraction analysis show that doping does not cause any structural change; Ni and Ce-containing phases are not observed at room temoerature or even at 250℃.展开更多
This paper starts from the analysis of how Alan Turing proceeded to build the notion of computability in his famous 1936 text ＂On computable numbers, with an application to the Entscheidungsproblem＂. Looking in deta...This paper starts from the analysis of how Alan Turing proceeded to build the notion of computability in his famous 1936 text ＂On computable numbers, with an application to the Entscheidungsproblem＂. Looking in detail at his stepwise construction, which starts from the materialities to achieve a satisfactory level of abstraction, it is considered how his way of doing mathematics was one that constructs mathematical knowledge by evading a definite separation between matter and form; in this way, making the world and language come together. Following the same line of reasoning, it is argued in this paper that the abstract and the concrete, the deduction and the induction, the technical and the social as well as the objective and the subjective are unthinkable as pure entities. By considering the controversies and discussions from the mid-nineteenth century until now, it is shown that local （social） elements necessarily participate in what is usually considered ＂technical content＂ or ＂objectivity＂. While Alan Turing was a precursor of what today might be said to be an ＂anthropological approach to mathematical culture＂, unveiling and reviving approaches that enable the axis of authority for mathematics, logic and computing to be shifted, he also opened different paths for the construction of a variety of mathematical knowledge as well.展开更多
深圳外科论坛于10月19日在香港大学深圳医院召开。强大的讲者阵容是会议一大亮点,讲者级别堪比欧洲胸外科医师学会(European Society of Thoracic Surgeons,ESTS)会议,包括中国胸外科的"大佬",如何建行、刘伦旭、方文涛等几...深圳外科论坛于10月19日在香港大学深圳医院召开。强大的讲者阵容是会议一大亮点,讲者级别堪比欧洲胸外科医师学会(European Society of Thoracic Surgeons,ESTS)会议,包括中国胸外科的"大佬",如何建行、刘伦旭、方文涛等几位教授,国外胸外科泰斗则包括有单孔手术的鼻祖Gaetano Rocco教授,堪称印度机器人手术之王的Ali Zamir Khan教授,以及来自韩国、活跃于各大重要会议并正领导着微创胸腔镜手术培训项目的 Sanghoon Jheon教授,他以开展微创胸腔镜外科闻名于亚洲。在食管方面,台湾的Jang-Ming Lee教授和日本的Harushi Udagawa教授等皆是胸外科的佼佼者。为期一天的会议安排紧凑,具体分为胸外科技术新领域(Thoracic Surgery on the Horizon)、微创胸外科(Minimally Invasive Thoracic Surgery)、胸外科疾病治疗前瞻(Advances in Treatment of Thoracic Diseases)、手术演示(Sunday Afternoon at the Movies)四个版块,旨在让听众可以在一天之内听到不同的声音。会议结束之时,AME编辑有幸采访到会议主持兼讲者司徒达麟(Alan Sihoe)教授跟我们分享他这次会议的体会。。展开更多
基金supported by the Research Intensified Grant Scheme (RIGS) under grant number VOT 55440 provided by Universiti Malaysia Terengganu (UMT)the SIPP Incentive sponsored by UMT
文摘For the first time,the MgH_(2)–NaAlH_(4)(ratio 4:1)destabilized system with CoTiO_(3) addition has been explored.The CoTiO_(3)-doped MgH_(2)–NaAlH_(4) sample begins to dehydrogenate at 130℃,which is declined by 40℃ compared to the undoped MgH_(2)–NaAlH_(4).Moreover,the de/rehydrogenation kinetics characteristics of the CoTiO_(3)-doped MgH_(2)–NaAlH_(4) were greatly ameliorated.With the inclusion of CoTiO_(3),the MgH_(2)–NaAlH_(4) composite absorbed 5.2 wt.%H_(2),higher than undoped MgH_(2)–NaAlH_(4).In the context of dehydrogenation,the CoTiO_(3)-doped MgH_(2)–NaAlH_(4) sample desorbed 2.6 wt.%H_(2),almost doubled compared to the amount of hydrogen desorbed from the undoped MgH_(2)–NaAlH_(4) sample.The activation energy obtained by the Kissinger analysis for MgH_(2) decomposition was significantly lower by 35.9 kJ/mol than the undoped MgH_(2)–NaAlH_(4) sample.The reaction mechanism demonstrated that new phases of MgCo and AlTi_(3) were generated in situ during the heating process and are likely to play a substantial catalytic function and be useful in ameliorating the de/rehydrogenation properties of the destabilized MgH_(2)–NaAlH_(4) system with the inclusion of CoTiO_(3).
基金supported by the National High-Tech Research and Development Program (No.2006AA05Z132)the Program of the Ministry of Education of China for Changjiang Scholars and Innovative Research Teams in Universities (No.I2P407)
文摘LiAIH4 doped with Ni and Ce（SO4）2 additives and the effect of doping on temperature and hydrogen release were studied by pressure-content-temperature （PCT） experiment and X-ray diffraction （XRD） analysis. It is indicated that doping with Ni induces a significant decrease in temperature in the first step and LiA1H4 doped with 1mol% Ni presents the most absorption of hydrogen. Doping with Ce（S04）2 also causes a marked decrease, while the amount of hydrogen release changes only slightly. The results from X-ray diffraction analysis show that doping does not cause any structural change; Ni and Ce-containing phases are not observed at room temoerature or even at 250℃.
文摘This paper starts from the analysis of how Alan Turing proceeded to build the notion of computability in his famous 1936 text ＂On computable numbers, with an application to the Entscheidungsproblem＂. Looking in detail at his stepwise construction, which starts from the materialities to achieve a satisfactory level of abstraction, it is considered how his way of doing mathematics was one that constructs mathematical knowledge by evading a definite separation between matter and form; in this way, making the world and language come together. Following the same line of reasoning, it is argued in this paper that the abstract and the concrete, the deduction and the induction, the technical and the social as well as the objective and the subjective are unthinkable as pure entities. By considering the controversies and discussions from the mid-nineteenth century until now, it is shown that local （social） elements necessarily participate in what is usually considered ＂technical content＂ or ＂objectivity＂. While Alan Turing was a precursor of what today might be said to be an ＂anthropological approach to mathematical culture＂, unveiling and reviving approaches that enable the axis of authority for mathematics, logic and computing to be shifted, he also opened different paths for the construction of a variety of mathematical knowledge as well.
文摘深圳外科论坛于10月19日在香港大学深圳医院召开。强大的讲者阵容是会议一大亮点,讲者级别堪比欧洲胸外科医师学会(European Society of Thoracic Surgeons,ESTS)会议,包括中国胸外科的"大佬",如何建行、刘伦旭、方文涛等几位教授,国外胸外科泰斗则包括有单孔手术的鼻祖Gaetano Rocco教授,堪称印度机器人手术之王的Ali Zamir Khan教授,以及来自韩国、活跃于各大重要会议并正领导着微创胸腔镜手术培训项目的 Sanghoon Jheon教授,他以开展微创胸腔镜外科闻名于亚洲。在食管方面,台湾的Jang-Ming Lee教授和日本的Harushi Udagawa教授等皆是胸外科的佼佼者。为期一天的会议安排紧凑,具体分为胸外科技术新领域(Thoracic Surgery on the Horizon)、微创胸外科(Minimally Invasive Thoracic Surgery)、胸外科疾病治疗前瞻(Advances in Treatment of Thoracic Diseases)、手术演示(Sunday Afternoon at the Movies)四个版块,旨在让听众可以在一天之内听到不同的声音。会议结束之时,AME编辑有幸采访到会议主持兼讲者司徒达麟(Alan Sihoe)教授跟我们分享他这次会议的体会。。
