The mechanical effects of dilute liquid inclusions on the solid-liquid composite are explored,based on an analytical circular inclusion model incorporating the internal pressure change of the liquid and the surface te...The mechanical effects of dilute liquid inclusions on the solid-liquid composite are explored,based on an analytical circular inclusion model incorporating the internal pressure change of the liquid and the surface tension of the interface.Several simple explicit dependences of the stress field and effective stiffness on the bulk modulus and the size of the liquid,the surface tension,and Poisson’s ratio of the matrix are derived.The results show that the stresses in the matrix are reduced,and the stiffness of the solid-liquid composite is enhanced with the consideration of either the surface tension or the internal pressure change.Particularly,the effective Young’s modulus predicted by the present model for either soft or stiff matrices agrees well with the known experimental data.In addition,according to the theoretical results,it is possible to stiffen a soft solid by pressured gas with the presence of the surface tension of the solid-gas interface.展开更多
An international symposium on climatic change was held from August9-12,1990 in Beijing.Over 150 participants from 9 countries gathered to discuss various aspects of the earth’s climate.Among them,over 30 scholars wer...An international symposium on climatic change was held from August9-12,1990 in Beijing.Over 150 participants from 9 countries gathered to discuss various aspects of the earth’s climate.Among them,over 30 scholars were from Japan,USA,USSR,FRG,UK,Italy,Australia and South Korea.This symposium held jointly with a commemoration meeting for the centennial birth of Professor Zhu Kezhen(formerly spelt as Co-ching Chu,1890-1974).Zhu was the late Vice-Present of the Chinese Academy of Sciences and the late Director of the Institute of Geography.He was the founder of modern geography and climate studies in China.He will always be remembered for展开更多
Organized by: Beijing Normal University, National Natural Science Foundation of China Hosted by: Institute of Resources Science, Beijing Normal UniversityKey Laboratory of Environmental Change and Natural Disaster, Mi...Organized by: Beijing Normal University, National Natural Science Foundation of China Hosted by: Institute of Resources Science, Beijing Normal UniversityKey Laboratory of Environmental Change and Natural Disaster, Ministry of Education of ChinaTopics:1) Detecting and monitoring LUCC2) Temporal-spatial characteristics in LUCC3) Driving model for LUCC4) Forecasting and modeling LUCC 5) Phenological and biochemical response on LUCC6) Regional LUCC and microclimate 7) LUCC in the context of global change8) Impact of global change on the sustainable land-use modelingAbstract submission: The official language of this conference is English. We invite papers written in English and an abstract of less than one page of standard A4 size to the Conference Secretariat by Apr 15, 2001. Registration Fee: 280 US$ (300 US$ after July 15, 2001)Add：No. 19, Xinjiekouwai Street, 100875, Institute of Resources Science, Beijing Normal University, Beijing, ChinaTel：86-10-62207656 or 62209024 Fax：010-62208178http:// 202.112.93.50/LUCCD2001/index.htmlE-mail: Pwang@bnu.edu.cn Cyh@bnu.edu.展开更多
In November 2016,Donald Trump,the Republican presidential candidate,defeated the highly popular Hillary Clinton,and became president elect of the United States.It is generally believed that Trump’s policies are hard ...In November 2016,Donald Trump,the Republican presidential candidate,defeated the highly popular Hillary Clinton,and became president elect of the United States.It is generally believed that Trump’s policies are hard to predict because of his lack of political experiences.The author believes that,it is necessary for the US展开更多
The international conference on mountain development in a context of global change with special focus on the Himalayas was held in Kathmandu, Nepal on April 21-26.
The fusion temperature as a function of pressure for carbon tetrachloride, chloroform, bromoform and silicon tetrachloride at pressures up to 3500MPa has been determined. The experimental data were fitted by the equat...The fusion temperature as a function of pressure for carbon tetrachloride, chloroform, bromoform and silicon tetrachloride at pressures up to 3500MPa has been determined. The experimental data were fitted by the equation Tfus=T0（1 ＋ Δp/a1）^a2 exp（-a3Δp） and the changes of the maolar enthalpy and molar internal energy on fusion were calculated using the parameters of the fitted equation. Comparisons with the data from the literature show that the experimental data, parameters of fitted equations, changes of the molar enthalpy and molar internal energy are reliable.展开更多
This paper analyzes in a long-term perspective the evolution of the international system between the 1920s and the 1980s in the particular case of broadcasting frequency regulation. It addresses the constructing of ＂...This paper analyzes in a long-term perspective the evolution of the international system between the 1920s and the 1980s in the particular case of broadcasting frequency regulation. It addresses the constructing of ＂Airy Curtains＂--the immaterial equivalent to the Iron Curtain-along ideological frontiers by focusing on the International Telecommunication Union＇s frequency allocation conferences throughout the ＂Cold War＂. The question is raised： Which changes in the construction of ＂Airy Curtains＂ and the international system are observable in a long term perspective？ The paper answers this question by telling a story of specialization and differentiation of the international system. At the core of the paper the tensions between experts and diplomats in the negotiations on international regulations are discussed. The paper argues that in three periods the governance changed from an expert matter over a conflictual diplomatic period into a system where ＇Cold War engineers＇ and the ＇Engineering diplomats＇ took a pragmatic approach to the ideological conflicts and the political demand for Cold War broadcasting by a decoupling of politics and technology. In that context decision-making changed from ＂conference diplomacy＂ in the beginning to a complex process where many problems were solved outside the conferences themselves.展开更多
It is impossible that proving the internal energy change has the relations with volume and pressure. About the second law of thermodynamics, many mistakes of formulations need to be put right and modified, and many ne...It is impossible that proving the internal energy change has the relations with volume and pressure. About the second law of thermodynamics, many mistakes of formulations need to be put right and modified, and many new concepts are surveyed too. The equality and inequality on the ratios of internal energy change to temperature and work to temperature are discussed. The relation between the reversible paths and their realistic paths is also researched. In an isothermal process, the internal energy change for the gases is equal to zero, but the internal energy change is not equal to zero for the phase transition or chemical reaction. The Clausius inequality can be derived from the equation calculating the internal energy change in mathematics;it is the new method proving the Clausius inequality. These change laws of thermodynamics could be applied to the gravitational field and mechanical motion and so on.展开更多
Uncertainties in the International Situation Are on the Increase and Transformation of International Pattern and Order Accelerates and Deepens Since 2016,the world has begun to enter into a historical period of uncert...Uncertainties in the International Situation Are on the Increase and Transformation of International Pattern and Order Accelerates and Deepens Since 2016,the world has begun to enter into a historical period of uncertainty.The fact that the Ukrainian Crisis has dragged on for long and that展开更多
文摘The mechanical effects of dilute liquid inclusions on the solid-liquid composite are explored,based on an analytical circular inclusion model incorporating the internal pressure change of the liquid and the surface tension of the interface.Several simple explicit dependences of the stress field and effective stiffness on the bulk modulus and the size of the liquid,the surface tension,and Poisson’s ratio of the matrix are derived.The results show that the stresses in the matrix are reduced,and the stiffness of the solid-liquid composite is enhanced with the consideration of either the surface tension or the internal pressure change.Particularly,the effective Young’s modulus predicted by the present model for either soft or stiff matrices agrees well with the known experimental data.In addition,according to the theoretical results,it is possible to stiffen a soft solid by pressured gas with the presence of the surface tension of the solid-gas interface.
文摘An international symposium on climatic change was held from August9-12,1990 in Beijing.Over 150 participants from 9 countries gathered to discuss various aspects of the earth’s climate.Among them,over 30 scholars were from Japan,USA,USSR,FRG,UK,Italy,Australia and South Korea.This symposium held jointly with a commemoration meeting for the centennial birth of Professor Zhu Kezhen(formerly spelt as Co-ching Chu,1890-1974).Zhu was the late Vice-Present of the Chinese Academy of Sciences and the late Director of the Institute of Geography.He was the founder of modern geography and climate studies in China.He will always be remembered for
文摘Organized by: Beijing Normal University, National Natural Science Foundation of China Hosted by: Institute of Resources Science, Beijing Normal UniversityKey Laboratory of Environmental Change and Natural Disaster, Ministry of Education of ChinaTopics:1) Detecting and monitoring LUCC2) Temporal-spatial characteristics in LUCC3) Driving model for LUCC4) Forecasting and modeling LUCC 5) Phenological and biochemical response on LUCC6) Regional LUCC and microclimate 7) LUCC in the context of global change8) Impact of global change on the sustainable land-use modelingAbstract submission: The official language of this conference is English. We invite papers written in English and an abstract of less than one page of standard A4 size to the Conference Secretariat by Apr 15, 2001. Registration Fee: 280 US$ (300 US$ after July 15, 2001)Add：No. 19, Xinjiekouwai Street, 100875, Institute of Resources Science, Beijing Normal University, Beijing, ChinaTel：86-10-62207656 or 62209024 Fax：010-62208178http:// 202.112.93.50/LUCCD2001/index.htmlE-mail: Pwang@bnu.edu.cn Cyh@bnu.edu.
文摘In November 2016,Donald Trump,the Republican presidential candidate,defeated the highly popular Hillary Clinton,and became president elect of the United States.It is generally believed that Trump’s policies are hard to predict because of his lack of political experiences.The author believes that,it is necessary for the US
文摘The international conference on mountain development in a context of global change with special focus on the Himalayas was held in Kathmandu, Nepal on April 21-26.
基金Project supported by the National Natural Science Foundation of China(Grant No20476071)
文摘The fusion temperature as a function of pressure for carbon tetrachloride, chloroform, bromoform and silicon tetrachloride at pressures up to 3500MPa has been determined. The experimental data were fitted by the equation Tfus=T0（1 ＋ Δp/a1）^a2 exp（-a3Δp） and the changes of the maolar enthalpy and molar internal energy on fusion were calculated using the parameters of the fitted equation. Comparisons with the data from the literature show that the experimental data, parameters of fitted equations, changes of the molar enthalpy and molar internal energy are reliable.
文摘This paper analyzes in a long-term perspective the evolution of the international system between the 1920s and the 1980s in the particular case of broadcasting frequency regulation. It addresses the constructing of ＂Airy Curtains＂--the immaterial equivalent to the Iron Curtain-along ideological frontiers by focusing on the International Telecommunication Union＇s frequency allocation conferences throughout the ＂Cold War＂. The question is raised： Which changes in the construction of ＂Airy Curtains＂ and the international system are observable in a long term perspective？ The paper answers this question by telling a story of specialization and differentiation of the international system. At the core of the paper the tensions between experts and diplomats in the negotiations on international regulations are discussed. The paper argues that in three periods the governance changed from an expert matter over a conflictual diplomatic period into a system where ＇Cold War engineers＇ and the ＇Engineering diplomats＇ took a pragmatic approach to the ideological conflicts and the political demand for Cold War broadcasting by a decoupling of politics and technology. In that context decision-making changed from ＂conference diplomacy＂ in the beginning to a complex process where many problems were solved outside the conferences themselves.
文摘It is impossible that proving the internal energy change has the relations with volume and pressure. About the second law of thermodynamics, many mistakes of formulations need to be put right and modified, and many new concepts are surveyed too. The equality and inequality on the ratios of internal energy change to temperature and work to temperature are discussed. The relation between the reversible paths and their realistic paths is also researched. In an isothermal process, the internal energy change for the gases is equal to zero, but the internal energy change is not equal to zero for the phase transition or chemical reaction. The Clausius inequality can be derived from the equation calculating the internal energy change in mathematics;it is the new method proving the Clausius inequality. These change laws of thermodynamics could be applied to the gravitational field and mechanical motion and so on.
文摘Uncertainties in the International Situation Are on the Increase and Transformation of International Pattern and Order Accelerates and Deepens Since 2016,the world has begun to enter into a historical period of uncertainty.The fact that the Ukrainian Crisis has dragged on for long and that
