We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loadin...We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic loss.The loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the central region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the central region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the central region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions.展开更多
Economies that have effectively escaped the“middle-income trap”demonstrate common traits in their industrial restructuring as they progressed to high-income status.These include a relatively stable share of an econ...Economies that have effectively escaped the“middle-income trap”demonstrate common traits in their industrial restructuring as they progressed to high-income status.These include a relatively stable share of an economy’s manufacturing sector,a reasonable economic structure,enhanced industrial capabilities,and growth driven by innovation.However,late-moving countries face a number of hurdles as they strive to cross this threshold.China’s development advantages include,among other things,a complete industrial system,a more balanced industrial structure,growing indigenous innovation capabilities,continual expansion and upgrading of domestic demand,and a greater degree of openness.These capabilities have provided continuous momentum for industrial growth,allowing China to capitalize on the next wave of technological and industrial revolutions while also promoting long-term,steady industrial development.During its modernization efforts,China has seen substantial changes in the external environment surrounding its industrial development.We must not only recognize the increasing complexity,intensity,and uncertainty of these changes,but also take proactive steps to solve diverse issues and capitalize on opportunities arising from global digital and green transitions.Equal focus should be placed on strengthening reforms and promoting high-level openness,improving policy coordination and consistency,and pursuing an innovation-driven strategy.This will speed the development of a modern industrial system and encourage the formation of new,high-quality productive forces.展开更多
Identification and counting of rice light-trap pests are important to monitor rice pest population dynamics and make pest forecast. Identification and counting of rice light-trap pests manually is time-consuming, and ...Identification and counting of rice light-trap pests are important to monitor rice pest population dynamics and make pest forecast. Identification and counting of rice light-trap pests manually is time-consuming, and leads to fatigue and an increase in the error rate. A rice light-trap insect imaging system is developed to automate rice pest identification. This system can capture the top and bottom images of each insect by two cameras to obtain more image features. A method is proposed for removing the background by color difference of two images with pests and non-pests. 156 features including color, shape and texture features of each pest are extracted into an support vector machine （SVM） classifier with radial basis kernel function. The seven-fold cross-validation is used to improve the accurate rate of pest identification. Four species of Lepidoptera rice pests are tested and achieved 97.5% average accurate rate.展开更多
In 2010, China entered what the World Development Bank Report of 2010 labeled as the upper-middle-income threshold with a GDP per capita of $4,396. China s current momentum will likely carry it through sustained grow...In 2010, China entered what the World Development Bank Report of 2010 labeled as the upper-middle-income threshold with a GDP per capita of $4,396. China s current momentum will likely carry it through sustained growth in the foreseeable future, but it remains unsure whether China will escape the middle-income trap and grow into a high-income country. The answer lies in China＇s ability to restructure its industrial and social structure.展开更多
China＇s per capita GDP surpassed US$4,000 in 2010, the threshold for an upper middle income countries. By drawing on examples of both Latin American countries that fell into the middle income trap and ＂Asian Tigers...China＇s per capita GDP surpassed US$4,000 in 2010, the threshold for an upper middle income countries. By drawing on examples of both Latin American countries that fell into the middle income trap and ＂Asian Tigers＂ （Singapore, South Korea, Taiwan and Hong Kong） that avoided this trap and became high income countries, this paper identifies two transformations in China＇s economic development： market-driven and factor- driven stages. China＇s growth is currently driven by efficiency, i.e. the upper middle income stage, and is set to reach the high income stage driven by innovation. This paper analyzes various factors that may drag China into the middle income trap during its upper middle income stage, warns of the urgency to avoid traps and transform its development model and identifies seven traps that must be guarded against.展开更多
Nowadays, more than 50% of the world population live in middle-income economies. Economies in the middle-income development stage are confronted with a number of challenges, such as economic restructuring, industrial ...Nowadays, more than 50% of the world population live in middle-income economies. Economies in the middle-income development stage are confronted with a number of challenges, such as economic restructuring, industrial upgrade and income growth. Therefore, academia around the worm have paid much attention to theoretical and empirical researches of the ＂middle income trap＂ and long-term trends of global economic growth. Based on analyses about the long-term growth path of the world economy and the characteristics of different stages of economic development, this paper defines the＂middle income trap＂ and its characteristics and examines, through a large number of cases from different economies, the reasons why ＂growth slowdown＂ arises during the middle-income development stage. These theoretic and empirical researches have reference value and heuristic meaning for China to actively respond to the challenges of the ＂middle income trap＂.展开更多
Through review of relevant studies and analysis, this article indicates that the ＂middleincome trap ＂ is in line with the framework of the mainstream economic growth theories, and, therefore, it is a useful concept ...Through review of relevant studies and analysis, this article indicates that the ＂middleincome trap ＂ is in line with the framework of the mainstream economic growth theories, and, therefore, it is a useful concept through which we can analyze economic growth phenomena in specific economic growth phases. The empirical experiences of many countries also indicate that at specific middle-income stages, economies with high rates of growth tend to encounter economic slowdown or even stagnation. The article shows that China is facing the challenge of determining how to move smoothly beyond the middle-income stage of economic development, while taking into account the shifting population structure, changing resource endowment and growth patterns. The article, drawing on international experiences, puts forward several policy suggestions relating to improvement in total factor productivity, expansion of human capital accumulation and deepening of system and governmentfunction reforms.展开更多
China is at a crucial stage of overcoming the middle-income trap, with the factors that drive economic growth having undergone significant changes, and domestic consumption playing a more important role in economic gr...China is at a crucial stage of overcoming the middle-income trap, with the factors that drive economic growth having undergone significant changes, and domestic consumption playing a more important role in economic growth. It is necessary, at this point, to promote mass consumption by expanding the middle-income group. The present paper puts forward the concept of the ＂double middle-income traps.＂ This refers to the situation in which an economy＇s per capita output stagnates and the size of the middle- income group is unable to expand for an extended period of time. These two factors are closely related. Based on data from the Chinese Social Survey conducted by the Institute of Sociology at the Chinese Academy of Social Sciences, the present paper analyzes the scale and development of middle-income groups, and the relationship among middle- income groups, the middle-class and middle-class identity. The marginal consumption propensities of middle-income groups are also considered. The findings of the paper indicate that the expansion of the middle-income group plays an important role in promoting mass consumption, maintaining continuous and stable economic growth, and overcoming the double middle-income traps.展开更多
The news China surpassed Japan as the world’s second largest economy in 2010 has put China in the limelight. China’s per-capita GDP has reached $4,000, turning the country from a lower middle-income country to an up...The news China surpassed Japan as the world’s second largest economy in 2010 has put China in the limelight. China’s per-capita GDP has reached $4,000, turning the country from a lower middle-income country to an upper middle-income country. But the economic growth model is still extensive and the income gap between the rich and the poor is widening.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.92365208,11934002,and 11920101004)the National Key Research and Development Program of China(Grant Nos.2021YFA0718300 and 2021YFA1400900)+1 种基金the Science and Technology Major Project of Shanxi(Grant No.202101030201022)the Space Application System of China Manned Space Program。
文摘We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic loss.The loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the central region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the central region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the central region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions.
文摘Economies that have effectively escaped the“middle-income trap”demonstrate common traits in their industrial restructuring as they progressed to high-income status.These include a relatively stable share of an economy’s manufacturing sector,a reasonable economic structure,enhanced industrial capabilities,and growth driven by innovation.However,late-moving countries face a number of hurdles as they strive to cross this threshold.China’s development advantages include,among other things,a complete industrial system,a more balanced industrial structure,growing indigenous innovation capabilities,continual expansion and upgrading of domestic demand,and a greater degree of openness.These capabilities have provided continuous momentum for industrial growth,allowing China to capitalize on the next wave of technological and industrial revolutions while also promoting long-term,steady industrial development.During its modernization efforts,China has seen substantial changes in the external environment surrounding its industrial development.We must not only recognize the increasing complexity,intensity,and uncertainty of these changes,but also take proactive steps to solve diverse issues and capitalize on opportunities arising from global digital and green transitions.Equal focus should be placed on strengthening reforms and promoting high-level openness,improving policy coordination and consistency,and pursuing an innovation-driven strategy.This will speed the development of a modern industrial system and encourage the formation of new,high-quality productive forces.
基金support of the National Natural Science Foundation of China (31071678)the Major Scientific and Technological Special of Zhejiang Province, China (2010C12026)+1 种基金the Ningbo Science and Technology Project, China (201002C1011001)Xiangshan Science and Technology Project, China(2010C0001)
文摘Identification and counting of rice light-trap pests are important to monitor rice pest population dynamics and make pest forecast. Identification and counting of rice light-trap pests manually is time-consuming, and leads to fatigue and an increase in the error rate. A rice light-trap insect imaging system is developed to automate rice pest identification. This system can capture the top and bottom images of each insect by two cameras to obtain more image features. A method is proposed for removing the background by color difference of two images with pests and non-pests. 156 features including color, shape and texture features of each pest are extracted into an support vector machine （SVM） classifier with radial basis kernel function. The seven-fold cross-validation is used to improve the accurate rate of pest identification. Four species of Lepidoptera rice pests are tested and achieved 97.5% average accurate rate.
文摘In 2010, China entered what the World Development Bank Report of 2010 labeled as the upper-middle-income threshold with a GDP per capita of $4,396. China s current momentum will likely carry it through sustained growth in the foreseeable future, but it remains unsure whether China will escape the middle-income trap and grow into a high-income country. The answer lies in China＇s ability to restructure its industrial and social structure.
文摘China＇s per capita GDP surpassed US$4,000 in 2010, the threshold for an upper middle income countries. By drawing on examples of both Latin American countries that fell into the middle income trap and ＂Asian Tigers＂ （Singapore, South Korea, Taiwan and Hong Kong） that avoided this trap and became high income countries, this paper identifies two transformations in China＇s economic development： market-driven and factor- driven stages. China＇s growth is currently driven by efficiency, i.e. the upper middle income stage, and is set to reach the high income stage driven by innovation. This paper analyzes various factors that may drag China into the middle income trap during its upper middle income stage, warns of the urgency to avoid traps and transform its development model and identifies seven traps that must be guarded against.
文摘Nowadays, more than 50% of the world population live in middle-income economies. Economies in the middle-income development stage are confronted with a number of challenges, such as economic restructuring, industrial upgrade and income growth. Therefore, academia around the worm have paid much attention to theoretical and empirical researches of the ＂middle income trap＂ and long-term trends of global economic growth. Based on analyses about the long-term growth path of the world economy and the characteristics of different stages of economic development, this paper defines the＂middle income trap＂ and its characteristics and examines, through a large number of cases from different economies, the reasons why ＂growth slowdown＂ arises during the middle-income development stage. These theoretic and empirical researches have reference value and heuristic meaning for China to actively respond to the challenges of the ＂middle income trap＂.
文摘Through review of relevant studies and analysis, this article indicates that the ＂middleincome trap ＂ is in line with the framework of the mainstream economic growth theories, and, therefore, it is a useful concept through which we can analyze economic growth phenomena in specific economic growth phases. The empirical experiences of many countries also indicate that at specific middle-income stages, economies with high rates of growth tend to encounter economic slowdown or even stagnation. The article shows that China is facing the challenge of determining how to move smoothly beyond the middle-income stage of economic development, while taking into account the shifting population structure, changing resource endowment and growth patterns. The article, drawing on international experiences, puts forward several policy suggestions relating to improvement in total factor productivity, expansion of human capital accumulation and deepening of system and governmentfunction reforms.
文摘China is at a crucial stage of overcoming the middle-income trap, with the factors that drive economic growth having undergone significant changes, and domestic consumption playing a more important role in economic growth. It is necessary, at this point, to promote mass consumption by expanding the middle-income group. The present paper puts forward the concept of the ＂double middle-income traps.＂ This refers to the situation in which an economy＇s per capita output stagnates and the size of the middle- income group is unable to expand for an extended period of time. These two factors are closely related. Based on data from the Chinese Social Survey conducted by the Institute of Sociology at the Chinese Academy of Social Sciences, the present paper analyzes the scale and development of middle-income groups, and the relationship among middle- income groups, the middle-class and middle-class identity. The marginal consumption propensities of middle-income groups are also considered. The findings of the paper indicate that the expansion of the middle-income group plays an important role in promoting mass consumption, maintaining continuous and stable economic growth, and overcoming the double middle-income traps.
文摘The news China surpassed Japan as the world’s second largest economy in 2010 has put China in the limelight. China’s per-capita GDP has reached $4,000, turning the country from a lower middle-income country to an upper middle-income country. But the economic growth model is still extensive and the income gap between the rich and the poor is widening.
