The dynamics of spin–orbit-coupled Bose–Einstein condensate with parity-time symmetry through a moving obstacle potential is simulated numerically. In the miscible two-component condensate, the formation of the K...The dynamics of spin–orbit-coupled Bose–Einstein condensate with parity-time symmetry through a moving obstacle potential is simulated numerically. In the miscible two-component condensate, the formation of the Kármán vortex street is observed in one component, while ‘the half-quantum vortex street' is observed in the other component. Other patterns of vortex shedding, such as oblique vortex dipoles, V-shaped vortex pairs, irregular turbulence, and combined modes of various wakes, can also be found. The ratio of inter-vortex spacing in one row to the distance between vortex rows is approximately0.18, which is less than the stability condition 0.28 of classical fluid. The drag force acting on the obstacle potential is simulated. The parametric regions of Kármán vortex street and other vortex patterns are calculated. The range of Kármán vortex street is surrounded by the region of combined modes. In addition, spin–orbit coupling disrupts the symmetry of the system and the gain-loss affects the local particle distribution of the system, which leads to the local symmetry breaking of the system, and finally influences the stability of the Kármán vortex street. Finally, we propose an experimental protocol to realize the Kármán vortex street in a system.展开更多
Car racing is a very exciting sport.Racecars have special engines.They cango much fandc faster than normal cars.Some can go over 300 kilometers an hour!There are many kinds of car racing.The most famous is Formula 1 o...Car racing is a very exciting sport.Racecars have special engines.They cango much fandc faster than normal cars.Some can go over 300 kilometers an hour!There are many kinds of car racing.The most famous is Formula 1 or F1.The cars sometimes race on city streets around the world.The cities close off the streets and prepare them for the race.An F1 race is very exciting,and F1 driversarethe best inthe world.展开更多
上次谈到针对每个话题要从不同的角度切入,而且切入后要立即将其展开。比如当你谈到 Pedestrians ignoring traffic signalsand road signs,你可以说:I have seen in-stances where pedestrians cross streets regard-less of the traff...上次谈到针对每个话题要从不同的角度切入,而且切入后要立即将其展开。比如当你谈到 Pedestrians ignoring traffic signalsand road signs,你可以说:I have seen in-stances where pedestrians cross streets regard-less of the traffic lights.Even if you are usingthe zebra crossing.it doesn’t mean you cancross the street when the light is red.再比如,当你谈到 Separate bicycle roads from展开更多
The translation of road names from Chinese into English applies no specific standards up to date. Whether the roads should be re ferred in accordance with the nearby position or some symbolic buildings or simply be re...The translation of road names from Chinese into English applies no specific standards up to date. Whether the roads should be re ferred in accordance with the nearby position or some symbolic buildings or simply be represented by a phonetic pronunciation which has no specific meaning in English has provoked some heated discussion. In this paper I employ the skopos theory and other relevant theories to put forward a new perspective of translating road and street names, with same emphasis on that of generic name and on specific name. Some illustrations will be made on the defects of the writing standard set by relevant Chinese laws and regulations as well as resolutions of the United Nations Conference on the Standardization of Geographical Names, i.e. the adoption of a Single Romanization System, and Lu to be the generic name in China's case. Also, I will further probe the existing translations of road and street names in major Chinese cities, most of which to be Road, either go against relevant laws or fail to inform foreign visitors. Finally, I will come up with the suggestion of ap plication of a combination of Lu and Road in translation of road and street names in accordance with functional approaches.展开更多
Street food trading solves major social and economic problems in developing countries through the provision of ready-made meals at relatively inexpensive prices and employment for teeming rural and urban populace alon...Street food trading solves major social and economic problems in developing countries through the provision of ready-made meals at relatively inexpensive prices and employment for teeming rural and urban populace along its value chain.However,due to informal nature of the enterprise,the activities of the practitioners are not regulated.This gives ample room for unwholesome practices.The results are the risks such activities pose to the health and safety of practitioners along the value chain.This review paper,a summary of literature reports on risk factors in street food trade in developing countries and recommended safety intervention,is written with the hope of providing global baseline for intervention to ensure safe food practices.Adoption of safety approaches that permeates the entire chain of street food business from good agricultural practices through hazard analysis critical control points strategy to good hygiene practices by farmers,vendors and consumers would significantly reduce risks in street food consumption.Above all,active collaboration of all stakeholders toward the strengthening and proper enforcement of public health policies to ensure safe practices and engender safer and healthier society is recommended.展开更多
This paper focuses on climate comfort degree evaluated from relationships between spatial characteristics and behaviors of a winter city.It is demonstrated that the influences of climatic factors on human comfort are ...This paper focuses on climate comfort degree evaluated from relationships between spatial characteristics and behaviors of a winter city.It is demonstrated that the influences of climatic factors on human comfort are remarkably different for different spatial characteristics and functions of the sites.An evaluation method of climatic comfort is propsed,in which attaining comfort is an adaptation process,and the dynamic changes in the process are according to the user’s subjective tendency to the variations of the spatial characteristics and functions of the space.The evaluation criteria are based on both physical and psychological hierarchy needs of a person,which include the spatial form for microclimatic conditions as well as the spatial social-economic characteristics of a site.To improve the local environment of a winter city by planning measurements,the Harbin Central Pedestrian Street is taken as an example in the application of the evaluation method,and different planning optimizing strategies are proposed accordingly.The results show that the pattern of climate comfort is characterized by reflecting the socialeconomic value and individual behavior characteristics.展开更多
Sandra Cisneros is a distinguished Chicano and Latina writer whose novel entitled The House on Mango Street focuses on identity construction.The paper will interpret Esperanza’s struggle for self-identity in the proc...Sandra Cisneros is a distinguished Chicano and Latina writer whose novel entitled The House on Mango Street focuses on identity construction.The paper will interpret Esperanza’s struggle for self-identity in the process of her growth both physically and psychologically.展开更多
Interactions of shock waves and rows of vortices are studied by solving the two-dimensional,compressible Euler equations with a fifth-order weighted essentially non-oscillatory finite difference scheme.For a compressi...Interactions of shock waves and rows of vortices are studied by solving the two-dimensional,compressible Euler equations with a fifth-order weighted essentially non-oscillatory finite difference scheme.For a compressible flow the Mach number of the shock wave and vortex equals to 1.05 and 0.25,respectively.The resulting flow field contains complex shock structures,such as multiple shock focusing and reflecting regions.At the meantime,sound waves are generated,interrupted and reformed when they touch the main and reflected shock waves.展开更多
Nowadays,crowded environment and high-speed life pace are likely to bring mental stress and fatigue to citizens.How to apply achievements of the restorative environment into urban planning and environmental design has...Nowadays,crowded environment and high-speed life pace are likely to bring mental stress and fatigue to citizens.How to apply achievements of the restorative environment into urban planning and environmental design has received more attention in recent years.Earlier research does not provide detailed information about the specific components of the physical environment that support restoration.This study explores which characteristics of the street environment and psychological factors of the street environment have an impact on subjective restoration.The streets were sampled from Shenzhen.Each street was represented by a single photo.The photo was quantified in terms of the different objective street components and also rated on psychological variables related to restoration.The rating on the psychological variables,being away,fascination,coherence,scope,the likelihood of restoration,and preference were provided by people of various ages and occupations.The results show that:1)the proportion of natural elements have the greatest impact on street restoration benefits and preference,and its impact is robust;2)the two characteristics of street safety and quiet are important to street restoration benefits and preferences;3)fascination and being away have a greater impact on restorative benefits of streets,followed by coherence,and the scope of the street has no significant effect on restorative benefits.The study could provide evidence for policy-makers and urban design and planning interventions.展开更多
炒什么? 美国偶语中有这么一句话:“What’s cooking?”,但并不是“炒什么?“或”在做什么菜?”的意思。它是问干什么,发生了什么事,尤其在作为见面问候之用。与之同义的套语有:What’s happening?Whatis planued?或What’s wrong?试举...炒什么? 美国偶语中有这么一句话:“What’s cooking?”,但并不是“炒什么?“或”在做什么菜?”的意思。它是问干什么,发生了什么事,尤其在作为见面问候之用。与之同义的套语有:What’s happening?Whatis planued?或What’s wrong?试举例如下: “What’s cooking?Why is the crowd in the street?”(出了什么事?街上怎么这么多人?) “Why do you ask such a question?Anything cooking?”(你干吗问这样一个问题?出了什么事吗?)展开更多
Two sailors(水兵)、who had just finished a long voyage(航行)went home to their village and decided to have a fewdrinks in the bar there.When they had had enough,theycame out into the street to look for something amusi...Two sailors(水兵)、who had just finished a long voyage(航行)went home to their village and decided to have a fewdrinks in the bar there.When they had had enough,theycame out into the street to look for something amusing(有趣的)to do,but it was a very quiet place,and nothinginteresting ever happened there,so they could not展开更多
In the Western countries, especially in America, some social customshave lasted until today. For example, women in these countries arerespected in many ways. In the United States, as in Europe, you will see men usuall...In the Western countries, especially in America, some social customshave lasted until today. For example, women in these countries arerespected in many ways. In the United States, as in Europe, you will see men usually opendoor for women, and women generally walk ahead of men into a roomor a restaurant. unless the men have to be ahead of the ladies to choosethe table, to open the door of a car or render other services. On thestreet. men almost always walk or cross the street on the side of theladies which is closer to the traffic. But if a man walks with twoladies. he should walk in-between them.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 12065022 and 12147213)。
文摘The dynamics of spin–orbit-coupled Bose–Einstein condensate with parity-time symmetry through a moving obstacle potential is simulated numerically. In the miscible two-component condensate, the formation of the Kármán vortex street is observed in one component, while ‘the half-quantum vortex street' is observed in the other component. Other patterns of vortex shedding, such as oblique vortex dipoles, V-shaped vortex pairs, irregular turbulence, and combined modes of various wakes, can also be found. The ratio of inter-vortex spacing in one row to the distance between vortex rows is approximately0.18, which is less than the stability condition 0.28 of classical fluid. The drag force acting on the obstacle potential is simulated. The parametric regions of Kármán vortex street and other vortex patterns are calculated. The range of Kármán vortex street is surrounded by the region of combined modes. In addition, spin–orbit coupling disrupts the symmetry of the system and the gain-loss affects the local particle distribution of the system, which leads to the local symmetry breaking of the system, and finally influences the stability of the Kármán vortex street. Finally, we propose an experimental protocol to realize the Kármán vortex street in a system.
文摘Car racing is a very exciting sport.Racecars have special engines.They cango much fandc faster than normal cars.Some can go over 300 kilometers an hour!There are many kinds of car racing.The most famous is Formula 1 or F1.The cars sometimes race on city streets around the world.The cities close off the streets and prepare them for the race.An F1 race is very exciting,and F1 driversarethe best inthe world.
文摘英语在发展过程中吸收了大量的外来词。其中许多词已成为英语中的常用词,如 school,street,sick-le 词原为拉丁词。纵观英语发展,从丹麦入侵时期到二战结束,其间不断吸收了各国语言中的词语,其中不乏当今流行的“洋”名人名,其运用效果不同一般。下面将这些“名人”列举出来,以供参考。1.according to Cocker Cocker 指17世纪英国著名教师 Edward Cocker(1631—1675)。他讲授书法和算术,所著教科书 Cocker’s Arithmatick 非常流行,曾被广泛使用,再版多达百次以上,故有 according toCocker 一语,意为“根据严格的规则,精确的计算;
文摘上次谈到针对每个话题要从不同的角度切入,而且切入后要立即将其展开。比如当你谈到 Pedestrians ignoring traffic signalsand road signs,你可以说:I have seen in-stances where pedestrians cross streets regard-less of the traffic lights.Even if you are usingthe zebra crossing.it doesn’t mean you cancross the street when the light is red.再比如,当你谈到 Separate bicycle roads from
文摘The translation of road names from Chinese into English applies no specific standards up to date. Whether the roads should be re ferred in accordance with the nearby position or some symbolic buildings or simply be represented by a phonetic pronunciation which has no specific meaning in English has provoked some heated discussion. In this paper I employ the skopos theory and other relevant theories to put forward a new perspective of translating road and street names, with same emphasis on that of generic name and on specific name. Some illustrations will be made on the defects of the writing standard set by relevant Chinese laws and regulations as well as resolutions of the United Nations Conference on the Standardization of Geographical Names, i.e. the adoption of a Single Romanization System, and Lu to be the generic name in China's case. Also, I will further probe the existing translations of road and street names in major Chinese cities, most of which to be Road, either go against relevant laws or fail to inform foreign visitors. Finally, I will come up with the suggestion of ap plication of a combination of Lu and Road in translation of road and street names in accordance with functional approaches.
文摘Street food trading solves major social and economic problems in developing countries through the provision of ready-made meals at relatively inexpensive prices and employment for teeming rural and urban populace along its value chain.However,due to informal nature of the enterprise,the activities of the practitioners are not regulated.This gives ample room for unwholesome practices.The results are the risks such activities pose to the health and safety of practitioners along the value chain.This review paper,a summary of literature reports on risk factors in street food trade in developing countries and recommended safety intervention,is written with the hope of providing global baseline for intervention to ensure safe food practices.Adoption of safety approaches that permeates the entire chain of street food business from good agricultural practices through hazard analysis critical control points strategy to good hygiene practices by farmers,vendors and consumers would significantly reduce risks in street food consumption.Above all,active collaboration of all stakeholders toward the strengthening and proper enforcement of public health policies to ensure safe practices and engender safer and healthier society is recommended.
基金Funded by the National Natural Science Foundation of China(Grant No.51278140)the New-Century Training Program Foundation for Talents from the Ministry of Education of China(Grant No.NCET-11-0803)
文摘This paper focuses on climate comfort degree evaluated from relationships between spatial characteristics and behaviors of a winter city.It is demonstrated that the influences of climatic factors on human comfort are remarkably different for different spatial characteristics and functions of the sites.An evaluation method of climatic comfort is propsed,in which attaining comfort is an adaptation process,and the dynamic changes in the process are according to the user’s subjective tendency to the variations of the spatial characteristics and functions of the space.The evaluation criteria are based on both physical and psychological hierarchy needs of a person,which include the spatial form for microclimatic conditions as well as the spatial social-economic characteristics of a site.To improve the local environment of a winter city by planning measurements,the Harbin Central Pedestrian Street is taken as an example in the application of the evaluation method,and different planning optimizing strategies are proposed accordingly.The results show that the pattern of climate comfort is characterized by reflecting the socialeconomic value and individual behavior characteristics.
文摘Sandra Cisneros is a distinguished Chicano and Latina writer whose novel entitled The House on Mango Street focuses on identity construction.The paper will interpret Esperanza’s struggle for self-identity in the process of her growth both physically and psychologically.
基金Supported by the National Natural Science Foundation of China(11072053)
文摘Interactions of shock waves and rows of vortices are studied by solving the two-dimensional,compressible Euler equations with a fifth-order weighted essentially non-oscillatory finite difference scheme.For a compressible flow the Mach number of the shock wave and vortex equals to 1.05 and 0.25,respectively.The resulting flow field contains complex shock structures,such as multiple shock focusing and reflecting regions.At the meantime,sound waves are generated,interrupted and reformed when they touch the main and reflected shock waves.
文摘Nowadays,crowded environment and high-speed life pace are likely to bring mental stress and fatigue to citizens.How to apply achievements of the restorative environment into urban planning and environmental design has received more attention in recent years.Earlier research does not provide detailed information about the specific components of the physical environment that support restoration.This study explores which characteristics of the street environment and psychological factors of the street environment have an impact on subjective restoration.The streets were sampled from Shenzhen.Each street was represented by a single photo.The photo was quantified in terms of the different objective street components and also rated on psychological variables related to restoration.The rating on the psychological variables,being away,fascination,coherence,scope,the likelihood of restoration,and preference were provided by people of various ages and occupations.The results show that:1)the proportion of natural elements have the greatest impact on street restoration benefits and preference,and its impact is robust;2)the two characteristics of street safety and quiet are important to street restoration benefits and preferences;3)fascination and being away have a greater impact on restorative benefits of streets,followed by coherence,and the scope of the street has no significant effect on restorative benefits.The study could provide evidence for policy-makers and urban design and planning interventions.
文摘炒什么? 美国偶语中有这么一句话:“What’s cooking?”,但并不是“炒什么?“或”在做什么菜?”的意思。它是问干什么,发生了什么事,尤其在作为见面问候之用。与之同义的套语有:What’s happening?Whatis planued?或What’s wrong?试举例如下: “What’s cooking?Why is the crowd in the street?”(出了什么事?街上怎么这么多人?) “Why do you ask such a question?Anything cooking?”(你干吗问这样一个问题?出了什么事吗?)
文摘Two sailors(水兵)、who had just finished a long voyage(航行)went home to their village and decided to have a fewdrinks in the bar there.When they had had enough,theycame out into the street to look for something amusing(有趣的)to do,but it was a very quiet place,and nothinginteresting ever happened there,so they could not
文摘In the Western countries, especially in America, some social customshave lasted until today. For example, women in these countries arerespected in many ways. In the United States, as in Europe, you will see men usually opendoor for women, and women generally walk ahead of men into a roomor a restaurant. unless the men have to be ahead of the ladies to choosethe table, to open the door of a car or render other services. On thestreet. men almost always walk or cross the street on the side of theladies which is closer to the traffic. But if a man walks with twoladies. he should walk in-between them.
