科尔沁西部乌兰敖都地区气温与降水关系分析

利用科尔沁沙地西部乌兰敖都地区1981-2004年气象资料,分析气温和降水关系。结果表明,气温呈上升趋势,降水量呈相反趋势。各季节气温升高的月份正是降水量减少的月份,同时,降水量增加的月份正是气温降低的月份。春、冬季气温有逐渐回升的趋势。年降水量波动较大,5~9月降水(279.2 mm)占全年降水量的87.7%,同期平均降水日数(52.3 d)占年降水日数的70.3%。约有80%的最长干旱持续期出现在冬春两季。夏季和全年的降水量与其平均气温呈显著负相关(P<0.05),秋、春、冬季降水量与气温相关性依次逐渐减小2。4 a来降水量总体下降的趋势可能与1999-2004年年降水量低于多年平均降水量有关。

a new client-to-client password-authenticated key agreement protocol

Natl Univ Defen Technol, China & Nanyang Technol Univ, NUDT

stochastic process algebra based software process simulation modeling

Chinese Acad Sci, ISCAS Lab Internet Software Technologies

predicting upgrade project defects based on enhancement requirements: an empirical study

Chinese Acad Sci, ISCAS Lab Internet Software Technologies

process trustworthiness as a capability indicator for measuring and improving software trustworthiness

Chinese Acad Sci, ISCAS Lab Internet Software Technologies

separation of duty in trust-based collaboration

Chinese Assoc Cryptol Res, State Key Lab Informat Secur, Inst Software, Grad Univ Chinese Acad Sci, Natl Nat Sci Fdn China

盘式吸渗仪吸渗率计算方法比较

选用盘径为5 cm和15 cm的盘式吸渗仪,对杨凌土(粘土)和神木砂黄土(砂壤土)两种质地的土壤在0、-3、-6、-9-、12 cm水头5种负压下进行了室内吸渗实验,分析了不同盘径和负压对累积吸渗量的影响;并选用4种吸渗率公式对这两种质地土壤吸渗率进行了计算,以Vandervaere法为参考方法对该4种方法的适用性进行了分析。结果表明,在相同的时间内,两种土壤5 cm盘径下的累积吸渗量均大于15 cm盘径下的累积吸渗量,砂黄土累积吸渗量大于相同负压下土累积吸渗量;在4种吸渗率计算方法中,无论土还是砂黄土,Haverkamp公式所得吸渗率值与参考方法最接近。

incremental learning of triadic plsa for collaborative filtering

Beijing University of Technology (BJUT); Beijing Municipal Lab of Brain Informatics; Chinese Society of Radiology; National Natural Science Foundation of China (NSFC); State Administration of Foreign Experts Affairs

value-based multiple software projects scheduling with genetic algorithm

Chinese Acad Sci, ISCAS Lab Internet Software Technologies

an integrity assurance mechanism for run-time programs

Chinese Assoc Cryptol Res, State Key Lab Informat Secur, Inst Software, Grad Univ Chinese Acad Sci, Natl Nat Sci Fdn China

Deformation Monitoring and Forecasting Model Study Based on Grey System Theory

The grey system theory studies the uncertainty of small sample size problems. This paper using grey system theory in the deformation monitoring field, based on analysis of present grey forecast models, developed the spatial multi-point model. By using residual modification, the spatial multi-point residual model eras developed in further study. Then, combined with the sedimentation data of Xiaolangdi Multipurpose Dam, the results are compared and analyzed, the conclusion has been made and the advantages of the residual spatial multi-point model has been proved.