一个基于几何性质的(t, n)多重秘密共享方案

针对Wu-He方案需要秘密分发者为每个参与者分发大量的秘密信息的不足，利用双变量单向函数和公开偏移向量技术对Wu-He方案进行了改进，提出了一种基于几何方法的(t，n)门限多重秘密共享算法，通过一次秘密共享过程就可以实现对t-1个秘密的共享．在秘密重构过程中，每个合作的参与者只需提交一个由秘密份额计算的伪份额，而不必披露他的秘密份额，从而提高了秘密信息的利用率和秘密分发的效率，降低了系统的通信和存储复杂度．     

野大麦组织培养及植株再生的研究

以野大麦成熟胚为外植体，接种于MS 2，4-D2．0mg／L KT0．2mg／L NAA0．5mg／L Su3％的培养基中，诱导愈伤组织；然后在培养基MS 2，4-D2．0mg／L KT0．2mg／L NAA1．0mg／L Su3％上进行继代培养，每次继代时间为20天左右；再用MS KT2．0mg／L NAA0．2mg／L Su1．5％进行分化，分化率达80％以上．     

Positive correlation between δ~(18)O in monsoon precipitation and atmospheric wind speed

Analyzed results of the atmospheric wind speedand stable isotopic data (δ^18O) in summer precipitation atBangkok, Bombay, New Delhi, Kunming and Lhasa, the IAEA/WMO stations, indicate that δ^18O in monsoon pre-cipitation correlate positively to wind speed and that thereexists a monsoonal vapor layer over these monsoon-controlled areas during monsoon seasons. The isotopic ex-change happens between monsoon vapors and failing rain-drops in the layer, resulting in this correlation between δ^18O and wind speed. This suggests that wind speed is probablyone of key factors affecting the δ^18O variation besides air temperature and rainfall in the southwest monsoon domain.     

Modern systematics and environmental significance of stable isotopic variations in Wanxiang Cave, Wudu, Gansu, China

This paper presents the stable isotopic compositions from the cave dripwater and actively forming soda straw stalactites collected from Wanxiang Cave, Wudu, Gansu, located on the Qinghai-Tibetan Plateau and Loess Plateau transition zone, China. The δ^18Odw and δDdw of dripwater samples in the cave plot directly on the local MWL, constructed by using GNIP data from 3 sites surrounding the cave regions (Lanzhou, Xi‘an, and Chengdu), the nearest site to the cave, suggesting that there is a close relationship be-tween the δ^18Odw of the cave water and the δ^18O of the pre-cipitations. Using the measured δ^18Odw and δ^18Omc values from the mid-farthest parts from the cave entrance and the carbonate paleotemperature equation, the calculated temperatures range from 8.9 to 12.4℃, with the mean value of 10.7℃ and the temperature calculated at 8 locations in the farthest part of the cave is in the range of 10.I--12.4℃, with the mean value of 11.5℃, being consistent with the survey value(10.99℃)in the cave, slightly lower than the mean annual temperature (14.4℃) in Wudu. This suggests that modern speleothems are forming under isotopic equilibrium and their isotopic composition accurately reflects the mean annual temperature at the surface, indicating that the isotopic composition of the modern speleothems records local temperature change with credibility.     

离心泵的节能

文章在总结分析离心泵节能现状的基础上 ,提出节能途径     

SQL Server存储图像数据的策略与方法

在Visual Basic6．0开发环境中，采用客户机／服务器的工作方式，针对SQL Server数据库关系表中存储图像数据的问题进行了初步探讨，提出了一套基本解决方案，供读者参考。     

三维梁单元分配系数法集中质量阵的形成和在SAP5程序中的应用

本文利用动能相等原则,推导了三维梁单元的分配系数法集中质量阵。结合SAP5程序现有功能,将分配系数法集中质量阵用于梁单元组成的结构动态特性分析,提高了用SAP5程序求解该类结构的固有特性参数精度,文中还给出了实例,得出了一些有用的结论。     

杆状病毒gp64基因可能是细胞凋亡诱导因子

发现野生型芷宿丫纹夜蛾多粒包埋核多角体病毒诱导斜纹夜蛾细胞Ｓｌ－ｚｓｕ－１发生典型的细胞凋亡。ａｊｆｒ ｘｌｅｑ     

双头镜像磁盘的调度算法与性能评价

描述了两种先来先服务（ＦＣＦＳ）调度算法,一是串行定位的ＦＣＦＳ,另一个是并发定位的ＦＣＦＳ．提出了短寻道时间优先（ＳＳＴＦ）磁盘调度算法．在描述了模拟模型后,对以上三种调度算法进行了性能模拟及评价．从模拟结果中定量分析出并发定位调度算法的性能优于串行定位调度算法的性能,ＳＳＴＦ算法比ＦＣＦＳ算法的性能更优越．     

用有限元法研究振动钻头寿命

在考虑到钻头的复杂几何形状的同时,采用三维实体元即8节点元构造了微小钻头的有限元模型,并根据此模型对振动钻削时钻头的寿命进行了研究,揭示了振动钻削提高钻头寿命的机理．