Specification,Verification and Prototyping of an Optimized Compiler

This paper generalizes an algebraic method for the design of a correct compiler to tackle specification and verification of an optimized compiler. The main optimization issues of concern here include the use of existing contents of registers where possible and the identification of common expressions. A register table is introduced in the compiling specification predicates to map each register to an expression whose value is held by it. We define different kinds of predicates to specify compilation of programs, expressions and Boolean tests. A set of theorems relating to these predicates, acting as a correct compiling specification, are presented and an example proof within the refinement algebra of the programming language is given. Based on these theorems, a prototype compiler in Prolog is produced.     

Engagement of T cell receptor triggers its recruitment to low-density detergent-insoluble membrane domains

T-cell receptors (TCRs) upon binding to peptide-MHC ligands transduce signals in T lymphocytes. Tyrosine phosphorylations in the cytoplasmic domains of the CD3 (gammadeltaepsilon) and zeta subunits of the TCR complex by Src family kinases initiate the signaling cascades via docking and activation of ZAP-70 kinase and other signaling components. We examined the role of the low-density detergent-insoluble membranes (DIMs) in TCR signaling. Using mouse thymocytes as a model, we characterized the structural organization of DIMs in detail. We then demonstrated that TCR engagement triggered an immediate increase in the amount of TCR/CD3 present in DIMs, which directly involves the engaged receptor complexes. TCR/CD3 recruitment is accompanied by the accumulation of a series of prominent tyrosine-phosphorylated substrates and by an increase of the Lck activity in DIMs. Upon TCR stimulation, the DIM-associated receptor complexes are highly enriched in the hyperphosphorylated p23 zeta chains, contain most of the TCR/CD3-associated, phosphorylation-activated ZAP-70 kinases and seem to integrate into higher order, multiple tyrosine-phosphorylated substrate-containing protein complexes. The TCR/CD3 recruitment was found to depend on the activity of Src family kinases. We thus provide the first demonstration of recuitment of TCR/CD3 to DIMs upon receptor stimulation and propose it as a mechanism whereby TCR engagement is coupled to downstream signaling cascades.     

ASSM-Ⅱ型声学悬浮泥沙观测系统

本文介绍了一种新型的水文观测设备－“ＡＳＳＭ－Ⅱ型声学悬浮泥沙观测系统”，它可认自动，连续和长时间地实时观测水中悬浮泥沙深度分布和动态变化过程，文中介绍了工作原理框图，技术参数，性能特点及海上现场观测结果。     

钨合金的各向异性及残余应力测试的可行性

Ｘ射线分析显示钨合金经旋锻后存在着择优取向性，据此探讨了残余应力测定的可能性，考察加工状态对不同晶面的应力常数和弹性模量的影响，实验表明选用ＣｏＫａ－（２２２）虽有织构干扰产生衍射强度的反常分布，但不破坏２θ与Ｓｉｎ＾２ψ的直线关系，仍适合应力测试。比较而言，选用ＦａＫａ－（３１０）可避免织构的影响。且因谱线尖锐，峰强度高更于实际测试，随着表面加工程度增加，半高宽值增大，应力常数值减小，弹性模量因     

CF/ABS树脂复合材料制备工艺对导电性能的影响及对屏蔽性能的理论预测

本文研究了使用溶剂法、密炼机和开炼机混炼碳纤维填充ABS树脂复合材料的导电性能,得到了纤维填充量与复合材料电阻率的关系,对其导电机理进行了分析.通过比较,发现纤维长径比是决定复合材料导电性能的重要因素,其它如纤维在基体中的分布也对复合材料导电性能有影响.最后对复合材料的屏蔽性能进行了理论计算.     

BEM 系列原油流动性改进剂的应用

对BEM系列原油流动性改进剂的基本原理以及在中洛、濮临、东临、东黄、鲁宁、魏荆等几条原油长输管道工业应用的现场测试情况进行了介绍。结果表明，BEM系列原油流动性改进剂在降低原油凝点和粘度方面性能良好，能满足管道安全，平稳运行的要求。     

加强民用电管理的技术措施

提出并实施了住宅楼集中计量配电系统，为加强民用电管理提供了技术措施。     

位置灵敏塑料探测器阵列

本文描述了一个有效探测面积为100×70cm~2的位置灵敏塑料闪烁探测器阵列,它由两条100×5×1cm和6条100×10×1cm的Pilot U型塑料闪烁体组成。用~(252)Cfα放射源测得10cm宽的闪烁体的时间分辨、位置分辨和能量分辨分别为740ps,5.7cm和60％;5cm宽的闪烁体分别为610ps,4.7cm和40％。     

Delay-dependent state estimation for delayed neural networks

In this letter, the delay-dependent state estimation problem for neural networks with time-varying delay is investigated. A delay-dependent criterion is established to estimate the neuron states through available output measurements such that the dynamics of the estimation error is globally exponentially stable. The proposed method is based on the free-weighting matrix approach and is applicable to the case that the derivative of a time-varying delay takes any value. An algorithm is presented to compute the state estimator. Finally, a numerical example is given to demonstrate the effectiveness of this approach and the improvement over existing ones.