In the 21st century, world politics appeared to far from resolved condition in terms of power sharing among the elites, thus created separatism movements in many parts of the world. These movements caused some changes...In the 21st century, world politics appeared to far from resolved condition in terms of power sharing among the elites, thus created separatism movements in many parts of the world. These movements caused some changes in the society that is nowadays seen as a multicultural. Using World Values Survey＇s data, this study revealed that separatism would cause people to less likely agree on ethnic diversity benefit. Further, when the result is tested by elaboration model, economic condition was found as important factor on how people saw ethnic diversity benefit among the society.展开更多
This paper investigates long-term energy strategy compatible with significant reduction of world carbon dioxide （CO2） emissions, employing a long-term global energy model, Dynamic New Earth 21 （called DNE21）. The ...This paper investigates long-term energy strategy compatible with significant reduction of world carbon dioxide （CO2） emissions, employing a long-term global energy model, Dynamic New Earth 21 （called DNE21）. The model seeks the optimal energy mix from 2000 to 2100 that minimizes the world total energy system cost under various kinds of energy and technological constraints, such as energy resource constraints, energy supply and demand balance constraints, and CO2 emissions constraints. This paper discusses the results of primary energy supply, power generation mix, CO2 emission, CCS （carbon capture and storage） and total system costs for six regions including world as a whole. To evaluate viable pathways forward for implementation of sustainable energy strategies, nuclear power generation is a viable source of clean and green energy to mitigate the CO2 emissions. Present research shows simulation results in two cases consisting of no CO2 regulation case （base case） and CO2 REG case （regulation case） which halves the world CO2 emissions by the year 2050. Main findings of this research describe that renewable and nuclear power generation will contribute significantly to mitigate the CO2 emission worldwide.展开更多
During 1970s, the residential remains of the Yangshao Period were discovered at the Dadiwan site in Qin＇an County, Gansu Province, China. With carbon-14 dating, scanning electron microscope （SEM）, thermal expansion...During 1970s, the residential remains of the Yangshao Period were discovered at the Dadiwan site in Qin＇an County, Gansu Province, China. With carbon-14 dating, scanning electron microscope （SEM）, thermal expansion analyzer, polarizing microscope （PLM）, and X ray diffraction （XRD）, the microstructures and chemical compositions of the pottery shard, floor materials of the housing site, kunkur, calcined kunkur, ginger nut （calcium concretion） from the Dadiwan site were analyzed and re- searched. Analysis and simulation tests were also carried out to study the hydratability of calcined ginger nut and calcined kunkur, and the manufacturing process of the residential floors. The research shows that the floor was made of a light concrete formed by the mixture of aggregate of calcinated ginger nut （locally deposited）, red clay and kunkur. The dicalcium silicate （C2S） from the floor material of the housing site is one of the main constituents of modem cement, and the floor is also similar to modem concrete in nature. Therefore, the floor material of the housing site at the Dadiwan site was the earliest man-made concrete in the world ever discovered.展开更多
文摘In the 21st century, world politics appeared to far from resolved condition in terms of power sharing among the elites, thus created separatism movements in many parts of the world. These movements caused some changes in the society that is nowadays seen as a multicultural. Using World Values Survey＇s data, this study revealed that separatism would cause people to less likely agree on ethnic diversity benefit. Further, when the result is tested by elaboration model, economic condition was found as important factor on how people saw ethnic diversity benefit among the society.
文摘This paper investigates long-term energy strategy compatible with significant reduction of world carbon dioxide （CO2） emissions, employing a long-term global energy model, Dynamic New Earth 21 （called DNE21）. The model seeks the optimal energy mix from 2000 to 2100 that minimizes the world total energy system cost under various kinds of energy and technological constraints, such as energy resource constraints, energy supply and demand balance constraints, and CO2 emissions constraints. This paper discusses the results of primary energy supply, power generation mix, CO2 emission, CCS （carbon capture and storage） and total system costs for six regions including world as a whole. To evaluate viable pathways forward for implementation of sustainable energy strategies, nuclear power generation is a viable source of clean and green energy to mitigate the CO2 emissions. Present research shows simulation results in two cases consisting of no CO2 regulation case （base case） and CO2 REG case （regulation case） which halves the world CO2 emissions by the year 2050. Main findings of this research describe that renewable and nuclear power generation will contribute significantly to mitigate the CO2 emission worldwide.
文摘During 1970s, the residential remains of the Yangshao Period were discovered at the Dadiwan site in Qin＇an County, Gansu Province, China. With carbon-14 dating, scanning electron microscope （SEM）, thermal expansion analyzer, polarizing microscope （PLM）, and X ray diffraction （XRD）, the microstructures and chemical compositions of the pottery shard, floor materials of the housing site, kunkur, calcined kunkur, ginger nut （calcium concretion） from the Dadiwan site were analyzed and re- searched. Analysis and simulation tests were also carried out to study the hydratability of calcined ginger nut and calcined kunkur, and the manufacturing process of the residential floors. The research shows that the floor was made of a light concrete formed by the mixture of aggregate of calcinated ginger nut （locally deposited）, red clay and kunkur. The dicalcium silicate （C2S） from the floor material of the housing site is one of the main constituents of modem cement, and the floor is also similar to modem concrete in nature. Therefore, the floor material of the housing site at the Dadiwan site was the earliest man-made concrete in the world ever discovered.
