Textured Tl(1223)/Ag Tapes Prepared by Electrophoretic Deposition

The conventional powder-in-tube technique does not allow to produce textured Tl(1223) tapes. An electrophoretic deposition technique was used to produce uniform layers of controlled thickness on Ag substrates by a simple and reproducible procedure. A high degree of texture, comparable with the one generally observed for Bi-based tapes was obtained thanks to the appropriate grain morphology, by simply alternating deposition and uniaxial pressing. After annealing, critical current densities of 11'000 A/cm² were reached.     

微波场效应管Ⅰ—Ⅴ特性模型研究

本文对微波场效应管Ⅰ—Ⅴ特性模型进行了研究,分析比较了八种常用模型的优缺点,它可为微波电路的设计提供一个实用的参考依据.在模型参数提取中,我们采用了一种新算法,先应用一个基于主成份灵敏度分析的空间坐标变换,然后采用Levenberg-Marquardt算法进行优化拟合.实际计算表明,此法能够快速、精确地提取模型参数.     

C^3I系统综合评价

评述了兵器系统的评价现状，指出：运用生产阶段的评价规范于论证、研制阶段是不适宜的，评价的研讨、共识和规范化是亟待加强的过程。并给出了两种实用综合评价模型及它们在Ｃ＾３Ｉ系统论证、研制阶段中的应用。     

Physical localization of the flocculation gene FLO1 on chromosome I of Saccharomyces cerevisiae

The genetics of flocculation in the yeast Saccharomyces cerevisiae are poorly understood despite the importance of this property for strains used in industry. To be able to study the regulation of flocculation in yeast, one of the genes involved, FLO1, has been partially cloned. The identity of the gene was confirmed by the non-flocculent phenotype of cells in which the C-terminal part of the gene had been replaced by the URA3 gene. Southern blots and genetic crosses showed that the URA3 gene had integrated at the expected position on chromosome I. A region of approximately 2 kb in the middle of the FLO1 gene was consistently deleted during propagation in Escherichia coli and could not be isolated. Plasmids containing the incomplete gene, however, were still able to cause weak flocculation in a nonflocculent strain. The 3′ end of the FLO1 gene was localized at approximately 24 kb from the right end of chromosome I, 20 kb centromere-proximal to PHO11. Most of the newly isolated chromosome I sequences also hybridized to chromosome VIII DNA, thus extending the homology between the right end of chromosome I and chromosome VIII to approximately 28 kb.     

高密度封装的△I噪声分析

介绍了一种分析封装中△Ｉ噪声的电路模型，根据此模型推导出输出电压方程。应用该方程分析讨论了封装中电源线、接地线及旁路电容对△Ⅰ噪声所产生的影响，总结了控制封装中电源线、接地线电参数的方法，并通过改变电源线、接地线参数及旁路电容值，实现了改善封装中△Ｉ噪声的目的。     

Six PL/I compilers

This paper describes an experimental evaluation of the execution speed of object programs produced by six PL/I compilers. A set of 139 representative PL/I statements were compiled and executed under the PL/I Optimizing, PL/I(F), PL/C, PL/I Checkout, SP/k and PLUTO compilers. An analysis is made of the relative speed of the object code produced by each compiler and also of the relative execution speed of each statement.     

一种复杂环境下目标图象的自动分割方法

本文提出一种用于实时图象跟踪的复杂环境下目标图象的自动分割方法,它可根据实际景物的变化适应性地交替使用基于景物复杂性分析的阈值分削和分层聚类分割两种工作方式,并尽可能抑制背景噪声的干扰。实验表明:本文所提方法的分割性能完全可与目前被认为是较为优越的几种实用分割方法相比,而在适应能力和可应用范围上它则明显优于后者,它的计算代价价通常也低于后者。     

不可压缩流体三维流动的数值计算

本文主要讨论不可压缩流体三维流动的数值计算方法,并通过计算实例证明方法的有效性。该方法适用于内燃机辅助系统内冷却水、燃油和润滑油的三维流动计算。     

Microwave resonator method for determining the content of anti-water crystallization addition in aviation kerosene

A microwave resonator method is suggested for determining anti-water crystallization additions (liquid “ I”) in aviation kerosene. Experimental results are provided. __________ Translated from Izmeritel’naya Tekhnika, No. 2, pp. 64–68, February 2006.     

Taming the PL/I syntax

Ideally the syntactic part of a PL/I compiler would be generated directly from the semi-formal definition of ANSI Standard PL/I. A practical approach to this is described, using finite state machines and an LALR parser generator. The parser uses a method due to Aoe which avoids list searching. Adapted for this method the PL/I grammar has 841 states. The parse table generator exploits the freedom to renumber states in a way that improves on previous algorithms for compacting the tables. The parser tables occupy less than 4K bytes.