dast

A DAST Programming for the Analysis of Ship Model Test Data

船模试验数据分析DAST程序设计

Eliminating the restraint factor existing in the disposition of productive factors is the key point of DAST ;

②清除或缓解生产要素配置中的“瓶颈”制约，是农业科技发展的突破口；

Advancing the develop-ment of agricultural productivity which consists of social and natural productivity is the main aim of DAST .

提高由社会生产力和自然生产力构成的农业生产力的整体水平，是它业科技发展的落脚点。

Heat conduction investigations of the Si bridge in infrared emitter using micro-Raman scattering Characterization of the Organic Crystal DAST as a THz Emitter

Si微电阻桥温度分布与热传导特性的显微Raman光谱研究利用国内生长的有机晶体DAST作为THz源的研究

It is concluded that the home-grown DAST is a kind of high-efficiency THz material , and could become a good THz emitter and detector after the improvement in growing process .

结果表明，国内新生长的有机晶体DAST的确是一种高效率的THz产生晶体，优化生长条件后将可得到更高的产生效率。

DAST is one kind of the most important materials in generating and detecting THz radiation for the reason that it has large optical nonlinear and electrooptic coefficients , low dielectric dispersion , large coherence length and ultra fast response time .

DAST因具有高的非线性和电光系数、低的介电常数、大的相干长度和快的响应时间等优点而在光整流法产生和探测THz波方面存在巨大应用潜力，目前对其研究较多。

It could also improve the resistance to various diseases . After applying 3 times , 1 / 500 dilutions efficacy against Phytophthora infestans was 74.0 % , 1 / 300 dilutions efficacy against Phytophthora parasitica dast was 78.2 % .

同时它可以明显提高番茄对病害的抵抗能力，抑制病害发生，且3次施药效果更佳，500倍液第3次施药后对番茄晚疫病防效达到74.0%，300倍液对绵疫病可达78.2%。

In the Dast twenty years or more , many methods about MTT ( Multiple Target Tracking ) have been given . Among them , the method of Exact Nearest Neighbor PDA ( ENNPDA ) is small in computation , easy in engineering implementation and good in performance .

近二十年来，人们提出了许多关于多目标跟踪的方法，其中精确最近邻PDA（EN－NPDA）方法计算量小、性能较好、易于工程实现。

Samples including roots , stems and leaves infected by root rot on heart rot disease were collected from pineapple garden in Hainan Island , and a total of 40 isolates of Phytophthora spp were isolated . All the isolates were identified as Phytophthora parasitica Dast .

从海南岛的菠萝植区发生根腐病或心腐病的菠萝上收集大量病组织样本，经纯化获得40个疫霉分离菌株，全部鉴定为寄生疫霉（PhytophthoraparasiticaDast.）