New Lyapunov-Krasovskii Functional for Stability Analysis of Linear Systems with Time-Varying Delay

This paper focuses on the problem of delay-dependent stability of linear systems with time-varying delay. A new delay-product-type augmented Lyapunov-Krasovskii functional(LKF) is constructed. Based on the LKF and by employing a generalized free-matrix-based integral inequality,less conservative delay-dependent stability criteria are obtained. Finally, two well-known numerical examples are used to confirm the effectiveness and the superiority of the presented stability criteria.     

Mutations in ISPD cause Walker-Warburg syndrome and defective glycosylation of α-dystroglycan

Walker-Warburg syndrome (WWS) is an autosomal recessive multisystem disorder characterized by complex eye and brain abnormalities with congenital muscular dystrophy (CMD) and aberrant a-dystroglycan glycosylation. Here we report mutations in the ISPD gene (encoding isoprenoid synthase domain containing) as the second most common cause of WWS. Bacterial IspD is a nucleotidyl transferase belonging to a large glycosyltransferase family, but the role of the orthologous protein in chordates is obscure to date, as this phylum does not have the corresponding non-mevalonate isoprenoid biosynthesis pathway. Knockdown of ispd in zebrafish recapitulates the human WWS phenotype with hydrocephalus, reduced eye size, muscle degeneration and hypoglycosylated a-dystroglycan. These results implicate ISPD in a-dystroglycan glycosylation in maintaining sarcolemma integrity in vertebrates.     

建筑构件多功能耐火试验炉的设计

为了适应多种建筑构件耐火试验,并提高试验的可靠性,根据GB/T9978—1999标准的要求,设计了水平建筑构件耐火试验炉和垂直建筑构件耐火试验炉各一座.通过合理布置燃烧器,使炉内的温度更均匀,利用自行设计的控制系统对炉内的温度及压力进行自动控制,克服了传统人工操作的各种缺点,同时也减少了污染,节省了空间,节约了燃料及人工成本.最后介绍了试验炉的使用情况,取得了较好的效果.     

溴代双酚A型不饱和聚酯树脂的阻燃机理

利用TGA、DSC、热解-电导率仪,研究了文题内容。实验结果说明了溴的引入,使树脂具有良好的阻燃性,当溴含量大于7.63%(wt)时,树脂即能自熄。溴使树脂热解过程成碳倾向增加,分解生成的溴化氢是有效的自由基捕获剂。三氧化二锑和溴同时引入,对阻燃具有协同效应。     

An ant colony algorithm for solving Max-cut problem

Max-cut problem is an NP-complete and classical combinatorial optimization problem that has a wide range of applications in different domains, such as bioinformatics, network optimization, statistical physics, and very large scale integration design. In this paper we investigate the capabilities of the ant colony optimization （ACO） heuristic for solving the Max-cut problem and present an AntCut algorithm. A large number of simulation experiments show that the algorithm can solve the Max-cut problem more efficiently and effectively.     

Research and Application of All-Position Automatic Welding Machine

The all-position automatic welding machine system is the special welding system for pipeline girth automatic welding on site, which has been widely used in the long distance pipeline construction projects due to the advantages of automatic control for welding parameters at all position, moving speed of bugs and operating. This automatic pipeline welding system has been successfully used in several main pipeline projects in China, and has been approved by the constructors with the benefits of higher quality passing rate, higher welding efficiency and lower labor intensity.     

用于生产低聚木糖的木聚糖酶菌株筛选

比较分别属于木霉属(Trichoderma)、毛壳属(Chaetomium)、黑曲霉属(Asperjgillus)、芽孢杆菌属(Bacillus)的12个菌株的木聚糖酶活性,以蔗渣木聚糖为底物,分析不同菌株木聚糖酶水解产物中的糖类组成,考察木聚糖酶系的稳定性。结果表明,毛壳属菌株所产木聚糖酶的水解产物中,低聚木糖的比例普遍高于其它类型菌株,其中球毛壳AS3．3601不仅木聚糖酶的活性较高,而且酶系稳定性最好,水解液中木二糖、木三糖占总糖含量的76％以上。球毛壳AS3,3601的发酵液按最大剂量0．4ml／10g给小鼠灌胃,每天1次,连续7d,所有受试小鼠均无中毒反应,初步认为球毛壳AS3．3601对于口服是安全的。     

基于Fluent的钻井纠斜液压系统导向套叶片形状优化选择

建立3种不同叶片截面形状导向套的SolidWorks模型,利用Fluent软件对自动垂直钻井系统导向套井下多相耦合流场进行仿真分析,得到泥浆通过不同叶片截面形状导向套时的流动特性,进而对导向套叶片截面形状进行优化选择。结果表明,旋转导向套采用三角形截面叶片为最佳选择。     

浅析水泥混凝土路面早期断板原因及防治

文章结合笔者参加检查验收的几条滑模施工和小型机具施工的混凝土路面发现有早期开裂断板,分析其成因并提出防治对策.