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41.
WUGuang ZHOUChunyuan ZENGHeping 《科学通报(英文版)》2003,48(16):1704-1708
We introduce a stable, long-distance singlephoton Sagnac interferometer, which has a balanced configuration to efficiently compensate phase drift caused by change of the fiber-optic path. By using time-division phase modulation, single-photon interference was realized at 1550nm in a 5-km-long as well as 27-km-long Sagnac fiber loops,with a fringe visibility higher than 90% and long-term stability. The stable performance of the single-photon interference indicated that the time-division phase-modulated Sagnac interferometer might readily lead to practical applications in single-photon routing and quantum cryptography. 相似文献
42.
43.
k consisting of k clusters, with k > 2. Bottom-up agglomerative approaches are also commonly used to construct partitions,
and we discuss these in terms of worst-case performance for metric data sets. Our main contribution derives from a new restricted
partition formulation that requires each cluster to be an interval of a given ordering of the objects being clustered. Dynamic programming can optimally split such an ordering into a partition Pk for a large class of objectives that includes min-diameter. We explore a variety of ordering heuristics and show that our
algorithm, when combined with an appropriate ordering heuristic, outperforms traditional algorithms on both random and non-random
data sets. 相似文献
44.
NPP distribution related to the terrains along the North-South Transect of Eastern China 总被引:2,自引:0,他引:2
LI Yan LIAO Shendong CHI Guobin & LIAO Qifang . Spatial Information Research Center South China Normal University Guangzhou China . Guangdong Key Laboratory of RS GIS Applications Guangzhou China 《科学通报(英文版)》2004,49(6):617-624
Vegetation net primary productivity (NPP) is defined as the accumulative amount of organic matters per unit area and time, which is calculated from the difference between accumulative photosynthesis and accumulative autotrophic respiration by green plants. Since the NPP reflects the physiological and ecological characteristics of the plants and the interactive results of the environmental factors, it is an important index to evaluate a structure of ecological system, functional features and … 相似文献
45.
Ibrahim M.AL-HARKAN 《系统科学与系统工程学报(英文版)》2005,14(2):187-206
1.Introduction Production sequencing and scheduling is one of the most important activities in production planning and control.Sequencing is defined as the order in which the jobs are processed through the machines.The allocation of machines over time to process a collection of jobs is defined as Scheduling.Several methods have been developed to solve the scheduling problem which can be classified as follows:1)efficient optimal methods,2)implicit and explicit,or complete enumerative methods,a… 相似文献
46.
GanShi-xin 《武汉大学学报:自然科学英文版》2004,9(1):13-17
This paper investigates some conditions which imply the strong laws of large numbers for Banach space valued random variable sequences. Some generalizations of the Marcinkiewicz- Zygmund theorem and the HoffmannJφrgensen and Pisier theorem are obtained. 相似文献
47.
ZhangNing LiuHai-lin YuZhu-xing XiongRui ShiJing 《武汉大学学报:自然科学英文版》2004,9(1):55-58
The characteristics of electronic transport properties: behaviors of magnetization curve and magnetic relaxation of a typical normal superconductor 2H-NbSe2 are investigated. The results show that Tc and △Tc of the samples are 7. 2,0. 18 K, indicating that superconducting energy gap at zero temperature is 1. 1 meV. No fish tail shape is found in the magnetization curves at several temperatures. The relationship between remnant magnetic moment and time reveals that the magnetic flux creep of the sample agrees with the Kim-Anderson thermal activation model with the relaxation rate S=0.000 36 at T=6 K. 相似文献
48.
Xiao Ling Yu Zu-yu Yang Chao Zhu Hua-yue Du Yu-min College of Resource Environmental Science Wuhan University Wuhan Hubei China 《武汉大学学报:自然科学英文版》2004,9(2):247-251
0 IntroductionChitosanisadeacetylatedderivativeofchitin ,containinginitsstructure glucosamineandacetylglucosamine joinedthroughβ (1→ 4 )linkages.ItisinsolubleinwaterandcommonorganicsolventsbutsolubleatapHunder 6 .5acidicmedia.Duetoitsexcellentbiodegradableandbiocompatiblecharacter,chi tosanhasbeenexaminedextensivelyinthepharmaceuticalindus tryforitspotentialinthedevelopmentofdrugdeliverysys tems[1 ,2 ] .Gelatinisabiodegradablepolymerofwidesafety ,pro ducedfromcollagen ,themostabundantprote… 相似文献
49.
ZHAO Wei HU Ke KIMOTO Akitsu MIZUYAMA Takahisa . Institute of Environmental Science Beijing Normal University Beijing China . College of Earth Sciences Jilin University Changchun Jilin China . Laboratory of Erosion Control Graduate School of Agriculture Kyoto University Kyoto Japan 《武汉大学学报:自然科学英文版》2004,9(4):527-532
0 IntroductionManystudieshavebeendoneonthesedimentdischargeinMt.Tanakami .Thosestudiesconcerntheamountofsedi mentsandfewdiscussionsabouttheprocessonly .Andthesedi mentyieldmechanismindevastatedslopeinMt.Tanakamiisnotfullyunderstood.Inordertorecordthewholeprocessofsoilero sionfromthebeginningofprecipitation ,totheendofsedimentmovement,asimulatingexperimentbyusingartificialrainiscon ducted .Basedonthisexperiment,andbyfurthercomparingwiththepreviousdataofsedimentsinthisarea,somebasicdataaboutc… 相似文献
50.
MAOCheng-ying LUYan-sheng 《武汉大学学报:自然科学英文版》2004,9(5):687-693
As the increasing popularity and complexity of Web applications and the emergence of their new characteristics. the testing and maintenance of large, complex Web applications are becoming more complex and difficult. Web applications generally contain lots of pages and are used by enormous users. Statistical testing is an effective way of ensuring their quality. Web usage can be accurately described by Markov chain which has been proved to be an ideal model for software statistical testing. The results of unit testing can b eutilized in the latter stages, wbich is an important strategy for bottom-to-top integration testing, and the other improvement of extended Markov chain model (FMM) is to present the error type vector which is treated as a part of page node. This paper also proposes the algorithm for generating test cases of usage paths. Finally, optional usage reliability evaluation methods and an incremental usability regression testing model for testing and evaluation are presented. 相似文献