The vibrational state-selected population transfer from a highly vibrationally excited level to the ground level is of great importance in the preparation of ultra-cold molecules. By using the time-dependent quantum-w...The vibrational state-selected population transfer from a highly vibrationally excited level to the ground level is of great importance in the preparation of ultra-cold molecules. By using the time-dependent quantum-wave-packet method, the population transfer dynamics is investigated theoretically for the HF molecule. A double-E-type laser scheme is proposed to transfer the population from the ｜v=16〉 level to the ground vibrational level ｜v=0〉 on the ground electronic state. The scheme consists of two steps： The first step is to transfer the population from ｜v=16〉 to ｜v=7〉 via an intermediate level ｜v=11〉, and the second one is to transfer the population from ｜v=7〉 to ｜v=0〉 via ｜v=3〉. In each step, three vibrational levels form a E-type population transfer path under the action of two temporally overlapped laser pulses. The maximal population-transfer efficiency is obtained by optimizing the laser inten- sities, frequencies, and relative delays. Cases for the pulses in intuitive and counterintuitive sequences are both calculated and compared. It is found that for both cases the population can be efficiently （over 90%） transferred from the ｜v=-16〉 level to the ｜v=0〉 level.展开更多
A new species of free-living nematode, Pseudolella major sp. nov. is described from the intertidal mudflats of Ximen Island in the East China Sea. Pseudolella major sp. nov. is characterized as follows： body length -...A new species of free-living nematode, Pseudolella major sp. nov. is described from the intertidal mudflats of Ximen Island in the East China Sea. Pseudolella major sp. nov. is characterized as follows： body length -1 300 μm; short cephalic setae, 2-3μm long; amphidial fovea loop-shaped with elongated ventral branch; ventral branch 50-60 μm long and extending past the base of buccal cavity; buccal cavity cylindrical with arching or spherical base; three heavy outwardly-curving odontia with blunt tips located at anterior of buccal cavity; pharynx short with posterior bulb; ventral gland cell elongate oval-shaped, located posterior to pharyngo-intestinal junction; excretory pore situated at the level of the middle of buccal cavity; tail conical to cylindrical; spicules arched, with double-cephalate proximal end; gubemaculum with a strong dorsal caudal apophysis.展开更多
The excavated height of the left bank slope of the diversion power system intake in Jinchuan hydropower station is about 16o m. The stability and safety of the slope during construction and its operation/utilization b...The excavated height of the left bank slope of the diversion power system intake in Jinchuan hydropower station is about 16o m. The stability and safety of the slope during construction and its operation/utilization become one of the most important geological engineering problems. At the same time, it is also crucial to select a safe and economic excavation gradient for the construction. We studied the problem of how to select a safe and economic slope ratio by analyzing the geological condition of the high slope, including the lithology, slope structure, structural surface and their combinations, rock weathering and unloading, hydrology, and the natural gradient. The study results showed that the use of an excavation gradient larger than the gradient observed during site investigation and the gradient recommended in standards and field practice manuals is feasible. Then, we used the finite element method and rigid limit equilibrium method to evaluate the stability of the excavation slope under natural, rainstorm and earthquake conditions. The calculated results showed that the excavated slope only has limited failure, but its stability is greatly satisfactory. The research findings can be useful in excavation and slope stabilization projects.展开更多
Spain became a net receiver country of a high number of foreigners entering the labour market in the first decade of the 21 st century. The ensuing economic crisis, beginning in 2007, led to the destruction of a large...Spain became a net receiver country of a high number of foreigners entering the labour market in the first decade of the 21 st century. The ensuing economic crisis, beginning in 2007, led to the destruction of a large number of companies and jobs. The objective of this paper is to analyze the relationship between educational level, employment and economic activity, in the Spanish and foreign working population in the Spanish labour market and the impact that the economic crisis is having on employment and self-employment. The hypotheses considered have been as followed--HI： The economic crisis mainly affects the less educated working population, both Spanish and foreign; H2： Self-employment is characterized by being an initiative of a working population with low educational levels for both population groups （Spanish and foreign）; H3： Employment is related to the productive economic structure. Micro-data from the Labour Force Survey 2009 （EPA in Spanish） has been used, compiled by Spains National Statistics Office （INE in Spanish）, and it has been applied Multiple Correspondence Analysis （MCA） to detect possible associations among the study variables （nationality, level of education, salaried employment, self-employment and economic activity）. The results show significant differences between both groups： Spanish and foreign working population. The study also shows how the crisis affects employment, and the important role played by the educational level of the working population, especially foreigners employed in certain economic activities.展开更多
It is increasingly found that medical investment is not the only effective means to improve the national health level. The basic public health service, which is dominated by disease control and prevention, is paid mor...It is increasingly found that medical investment is not the only effective means to improve the national health level. The basic public health service, which is dominated by disease control and prevention, is paid more and more attention.This paper analyzes the relationship between the migrant population and the population of the city＇s household registration to the basic public health service. Access to basic public health services and satisfaction of the system, analysis of the factors affecting the satisfaction of the basic public health services in Shanghai revealed the problems and causes of development. Finally, putting forward the concrete countermeasures and suggestions for perfecting and improving the basic public health service in Shanghai.展开更多
Since the reform and opening-up policy was implemented in China, the development of China＇ s medical and health undertakings has been very significant along with the rapid development of economy, and the people＇ s h...Since the reform and opening-up policy was implemented in China, the development of China＇ s medical and health undertakings has been very significant along with the rapid development of economy, and the people＇ s health level is steadily improved and the life expectancy is on the top list in the developing world. However, there are remarkable health differences among urban and rural areas, different regions, and small, medium-sized and large cities. In this paper, on the basis of the healthy social economic decision theory, the characteristics and causes of the regional difference between China＇ s residents in the health level are systematically analyzed, and then the strategies for the harmonious regional development of the Chinese population health are deeply discussed.展开更多
基金Li-hang Li thanks Dr. Yin Huang for assistance. The project is supported by the Specialized Research Fund for the Doctoral Program of Higher Education （No.20130041120053）, SRF for ROCS, SEM, the Sci- ence and Technology Research Funds of the Depart- ment of Education of Liaoning Province （L2013014）, the National Magnetic Confinement Fusion Science Pro- gram （No.2013GB109005）, the Fundamental Research Funds for the Central Universities （DUT12RC（3）60）, and the NationM Natural Science Foundation of China （No.21473018, No.10974024, and No.11274056）.
文摘The vibrational state-selected population transfer from a highly vibrationally excited level to the ground level is of great importance in the preparation of ultra-cold molecules. By using the time-dependent quantum-wave-packet method, the population transfer dynamics is investigated theoretically for the HF molecule. A double-E-type laser scheme is proposed to transfer the population from the ｜v=16〉 level to the ground vibrational level ｜v=0〉 on the ground electronic state. The scheme consists of two steps： The first step is to transfer the population from ｜v=16〉 to ｜v=7〉 via an intermediate level ｜v=11〉, and the second one is to transfer the population from ｜v=7〉 to ｜v=0〉 via ｜v=3〉. In each step, three vibrational levels form a E-type population transfer path under the action of two temporally overlapped laser pulses. The maximal population-transfer efficiency is obtained by optimizing the laser inten- sities, frequencies, and relative delays. Cases for the pulses in intuitive and counterintuitive sequences are both calculated and compared. It is found that for both cases the population can be efficiently （over 90%） transferred from the ｜v=-16〉 level to the ｜v=0〉 level.
基金Supported by the National Natural Science Foundation of China(No.41176107)
文摘A new species of free-living nematode, Pseudolella major sp. nov. is described from the intertidal mudflats of Ximen Island in the East China Sea. Pseudolella major sp. nov. is characterized as follows： body length -1 300 μm; short cephalic setae, 2-3μm long; amphidial fovea loop-shaped with elongated ventral branch; ventral branch 50-60 μm long and extending past the base of buccal cavity; buccal cavity cylindrical with arching or spherical base; three heavy outwardly-curving odontia with blunt tips located at anterior of buccal cavity; pharynx short with posterior bulb; ventral gland cell elongate oval-shaped, located posterior to pharyngo-intestinal junction; excretory pore situated at the level of the middle of buccal cavity; tail conical to cylindrical; spicules arched, with double-cephalate proximal end; gubemaculum with a strong dorsal caudal apophysis.
基金financially supported by Chinese National Natural Science Foundation (Grant No. 41072229)State Key Laboratory of Hydraulics and Mountain River Engineering (Sichuan University) open fund (Grant No. 201110)Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education and National Engineering Research Center for Inland Waterway Regulation (Chongqing Jiaotong University) open fund (Grant No. SLK2011B04)
文摘The excavated height of the left bank slope of the diversion power system intake in Jinchuan hydropower station is about 16o m. The stability and safety of the slope during construction and its operation/utilization become one of the most important geological engineering problems. At the same time, it is also crucial to select a safe and economic excavation gradient for the construction. We studied the problem of how to select a safe and economic slope ratio by analyzing the geological condition of the high slope, including the lithology, slope structure, structural surface and their combinations, rock weathering and unloading, hydrology, and the natural gradient. The study results showed that the use of an excavation gradient larger than the gradient observed during site investigation and the gradient recommended in standards and field practice manuals is feasible. Then, we used the finite element method and rigid limit equilibrium method to evaluate the stability of the excavation slope under natural, rainstorm and earthquake conditions. The calculated results showed that the excavated slope only has limited failure, but its stability is greatly satisfactory. The research findings can be useful in excavation and slope stabilization projects.
文摘Spain became a net receiver country of a high number of foreigners entering the labour market in the first decade of the 21 st century. The ensuing economic crisis, beginning in 2007, led to the destruction of a large number of companies and jobs. The objective of this paper is to analyze the relationship between educational level, employment and economic activity, in the Spanish and foreign working population in the Spanish labour market and the impact that the economic crisis is having on employment and self-employment. The hypotheses considered have been as followed--HI： The economic crisis mainly affects the less educated working population, both Spanish and foreign; H2： Self-employment is characterized by being an initiative of a working population with low educational levels for both population groups （Spanish and foreign）; H3： Employment is related to the productive economic structure. Micro-data from the Labour Force Survey 2009 （EPA in Spanish） has been used, compiled by Spains National Statistics Office （INE in Spanish）, and it has been applied Multiple Correspondence Analysis （MCA） to detect possible associations among the study variables （nationality, level of education, salaried employment, self-employment and economic activity）. The results show significant differences between both groups： Spanish and foreign working population. The study also shows how the crisis affects employment, and the important role played by the educational level of the working population, especially foreigners employed in certain economic activities.
文摘It is increasingly found that medical investment is not the only effective means to improve the national health level. The basic public health service, which is dominated by disease control and prevention, is paid more and more attention.This paper analyzes the relationship between the migrant population and the population of the city＇s household registration to the basic public health service. Access to basic public health services and satisfaction of the system, analysis of the factors affecting the satisfaction of the basic public health services in Shanghai revealed the problems and causes of development. Finally, putting forward the concrete countermeasures and suggestions for perfecting and improving the basic public health service in Shanghai.
文摘Since the reform and opening-up policy was implemented in China, the development of China＇ s medical and health undertakings has been very significant along with the rapid development of economy, and the people＇ s health level is steadily improved and the life expectancy is on the top list in the developing world. However, there are remarkable health differences among urban and rural areas, different regions, and small, medium-sized and large cities. In this paper, on the basis of the healthy social economic decision theory, the characteristics and causes of the regional difference between China＇ s residents in the health level are systematically analyzed, and then the strategies for the harmonious regional development of the Chinese population health are deeply discussed.
