共查询到20条相似文献，搜索用时 15 毫秒
1.
A simple scheme is presented for generating four-photon entangled states with interaction between a three-level atom and two bimodal cavities.In the proposed protocol,the quantum information is encoded on Fock states of the cavity fields.The detection of the atom can collapse the cavity made/wave function to the desired state.The experimental feasibility of our proposal is also discussed. 相似文献
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The essay expounds the philosophy of Thoreau’s "simplify" in aspect of meaning and reason.Closely connected with the relationship between human and nature,it enables us to see the point of a brooding,simple and sensible life of Thoreau.The end clarifies on a question:according to Thoreau,what is to have a simplify life? That’s to care for little,listen to one’s heart and do what one likes.The conclusion comes with an advocation that people keep a simple life with little greed,and take it as an ulti mate cure for the bothering life of today. 相似文献
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Directions:Read the following passage.The passage is followed by several questions or unfinished statements.For each of them there are four choices marked A,B,C and D.Choose the one that fits best according to the information given in the passage. The way people hold to the belief that a fun-filled,pain free life equals happiness actually reduces their chances of ever attaining real happiness.If 相似文献
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《中学英语之友(高三版)》2007,(3)
Shundagarh is a village on India's east-facing coast.It is a village of simple mud and grass houses built on the beach just 相似文献
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As one of the core components of turbocharger or micro-turbine, radial turbine has the features of small size and high rotation speed. In order to explore the design method and flow mechanism of the turbine with a volute, a centimeter-scale radial turbine with a vaneless air-inlet volute was designed and simulated numerically to investigate the characteristics of the coupled flow field. The results show that the wheel efficiency of single passage computation without the volute is 80.1%. After accounting for the factors of the loss caused by the volute and the interaction between each passage, the performance is more accurate according to the whole flow passage computation with the volute. High load region gathers at the mid-span and the efficiency declines to 76.6%. The performance of the volute whose structure angle of the trapezoid section is equal to 70 degree is better. Unlike uniform inlet condition in single passage, more appropriate inlet flow for the impeller is provided by the rectification effect of the volute in full passage calculation. Flow parameters are distributed more evenly along the blade span and are generally consistent between each passage at the outlet of the turbine. 相似文献
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A new method of bus-route network planning is presented by analyzing theservice characteristics of bus-route network.The following optimization objects areadopted:to minimize the total number of transfers from one route to another,to minimizethe total number of passenger-kilometers(or passenger-hours),to even passenger distri-bution on the network,and to make the directions of bus-routes consistent with the direc-tions of passenger flows.The algorithm is very simple.This method is suitable forlarge-sized and medium-sized cities and has been adopted in the transportation planningof Nanjing and Zhengzhou.The result is satisfactory. 相似文献
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Land degradation is one of the severe environmental problems in China. In order to combat land degradation, a soil conservation program was introduced since 2000 to reduce soil erosion by converting slope-cultivated land into forestry and pasture. This paper represents the first systematic attempt to investigate the impact of the soil conservation program on land degradation in the loess plateau. The results indicate that the soil conservation program to convert slope fields into forest or pasture is an effective way to combat soil erosion. However, a subsidy that is higher than profit of land use activity of slope fields before their conversion into forest and pasture is needed to encourage farmers to join the conservation program. A policy measure to encourage and assist farmers to develop sedentary livestock by using crops produced from fields as well as fodder and forage grass from the converted slope fields might contribute to combat soil erosion. Increase in off-farm job opportunities may encourage 相似文献
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This is a photograph of our village. Our village is in a valley. It is betweenn two hills. The village is on a river. Here is another photograph of the village. My sister and I are walking along the banks of the river. We are on the left. There is a boy i… 相似文献
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George Taylor owns a large dairy just outside a big city.The dairy supplies milkto the big city and to the suburbs that surround it.Because Mr.Taylor's dairy issuch a large one,he must hire many employees.These employees,over a hundredin all,are assigned to a number of different jobs in various parts of the dairy.Some of the employees work on the farm where feed is grown for the cows andcalves.In the fields that surround the dairy,the farmers raise grain and hay duringthe summer months.The main grain crop grown on Mr.Taylor's farm is wheat.Oth- 相似文献
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Directions:Read the following passage.The passage is followed by several questions or unfinished statements.For each of them there are four choices marked A,B,C,and D.Choose the one that fits best according to the information given in the passage. 相似文献
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This paper considers a reentrant scheduling problem on parallel primary machines with a remote server machine, which is required to carry out the setup operation. In this problem, each job has three operations. The first and last operations are performed by the same primary machine, implying the reentrance, and the second operation is processed on the single server machine. The order of jobs is predetermined in our context. The challenge is to assign jobs to the primary machines to minimize the makespan. We develop a genetic algorithm（GA） to solve this problem. Based on a simple strategy of assigning jobs in batches on the parallel primary machines, the standardized random key vector representation is employed to split the jobs into batches. Comparisons among the proposed algorithm, the branch and bound（BB） algorithm and the heuristic algorithm, coordinated scheduling（CS）, which is only one heuristic algorithm to solve this problem in the literature, are made on the benchmark data. The computational experiments show that the proposed genetic algorithm outperforms the heuristic CS and the maximum relative improvement rate in the makespan is 1.66%. 相似文献
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Directions:Read the following passage.The passage is followed by several questions or unfinished statements.For each of them there are four choices marked A,B,C and D.Choose the one that fits best according to the information given in the passage. 相似文献
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Directions:Read the following passage.The passage is followed by several questions or unfinished statements.For each of them there are four choices marked A,B,C and D.Choose the one that fits best according to the 相似文献
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The Call of the Wild is one of the representative works of the American writer Jack London.It was published in 1903.Once appearance,it quickly achieved great success for its beautiful language and multiple levels of the theme.Based on the industrialised and capitalistic society in American history,this novel vividly reproduces the Gold Rush in Klondike.The main plot describes a process of how a domesticated dog degenerated into a wild one and went back to nature.The hero Buck is endowed with human senses and characteristics,for London tried to use animal characters to illustrate moral precepts and exhibit human behaviours.The thesis intends to demonstrate the fascination of this great novel on one hand and on the other hand, to disclose the cruelty of the social reality at that time,in hope of providing a profound comprehension for the readers. 相似文献
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李秀娟 《和田师范专科学校学报》2006,26(5):123-124
Introduction Register is one of the cores of Functive Linguistics. It offers three decisive factors in language, that is, Field, Tenor and Mode. This paper plans to say something on the theory of register and analyze a short passage from the point of register. Register analysis as a stage of ESP movement took place mainly in 1960s and early 1970s. The representatives of this stage were Barber, Halliday, Ewer, Latorre and some others. Halliday and Hasan define register as “variation acco… 相似文献
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《英语自学》2000,(7)
VI. Reading Comprehension (Read the follow-ing passage carefully and then do the multi-ple choice questions, 10%) To be or not to be a vegetarian A strict vegetarian is a person who never in hislife eats anything derived from animals. The mainobjection to vegetarianism on a long-term basis is thedifficulty of getting enough protein-the body-build- 相似文献
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Directions:Read the following passage.The passage is followed by several questions or unfinished statements.For each of them there are four choices marked A,B,C and D.Choose the one that fits best according to the information given in the passage. Healthy knees aren’t the main consideration in choosing high heels,but new research says chunky heels are just as bad for the knees as spindly stilettos(细高跟鞋)."It takes a long time to feel the effects of knee osteoarthritis(骨关节炎)—and once you do it,it is too late,"said Dr.Casey Kerrigan,leading researcher of the study and associate professor at Harvard 相似文献