复合齿轮泵的几何流量特性

简介了复合齿轮泵结构原理并约定了有关概念;根据齿轮泵流量特性与啮合点位移基础理论,分析了中心轮和惰轮齿数特性对复合齿轮泵诸啮合点及位移影响;进一步分四种情况研究了啮合点运动规律和泵的流量特性,推导了流量脉动率公式,得出有关结论,供进一步研究参考     

Regulation of chondrocyte differentiation by ADAMTS-12 metalloproteinase depends on its enzymatic activity

ADAMTS-12, a metalloproteinase that belongs to ADAMTS family, is strongly upregulated during chondrogenesis and demonstrates prominent expression in the growth plate chondrocytes. ADAMTS-12 potently inhibits chondrocyte differentiation, as revealed by altered expression of both early and later genes critical for chondrogenesis. In addition, ADAMTS-12-mediated inhibition of chondrogenesis depends on its enzymatic activity, since its point mutant lacking enzymatic activity completely loses this activity. Furthermore, the C-terminal four thrombospondin motifs known to bind COMP substrate is necessary for its full proteolytic activity and inhibition of chondrocyte differentiation. Mechanism studies demonstrate that ADAMTS-12 induces PTHrP, whereas it inhibits IHH during chondrogenesis. Furthermore, PTHrP induces ADAMTS-12 and ADAMTS-12 is hardly detectable in PTHrP-/-growth plate chondrocytes. Importantly, knocking down ADAMTS-12 mRNA levels or blocking ADAMTS-12 activity almost abolishes the PTHrP-mediated inhibition of type X collagen expression. Collectively, these findings demonstrate that ADAMTS-12, a downstream molecule of PTHrP signaling, is a novel regulator of chondrogenesis. X. H. Bai, D.W. Wang: These two authors contributed equally to this work.     

泵站水锤特征线电算解法及其在陕西东雷泵站中的应用

本文对泵站水锤特征线电算解法的原理、方法和步骤进行了论述。并以装有两阶段关闭碟阀的大型泵站为例,探讨了碟阀关闭程序对水锤特性的影响,从而找出最优调节方案,为泵站安全运行提供了可靠依据。     

高速公路C50高强高性能混凝土的配制

文章通过试验方法,论证利用漳州本地区的原材料,选用高效减水剂和一级粉煤灰,水泥用量控制在425kg/m3以内,预制砼坍落度控制在50mm～70mm,泵送砼坍落度控制在180 mm～160mm,也能配制C50的高强度性能砼.     

Neural network-based H∞ filtering for nonlinear systems with time-delays

A novel H∞ design methodology for a neural network-based nonlinear filtering scheme is addressed.Firstly,neural networks are employed to approximate the nonlinearities.Next,the nonlinear dynamic system is represented by the mode-dependent linear difference inclusion (LDI).Finally,based on the LDI model,a neural network-based nonlinear filter (NNBNF) is developed to minimize the upper bound of H∞ gain index of the estimation error under some linear matrix inequality (LMI) constraints.Compared with the existing nonlinear filters,NNBNF is time-invariant and numerically tractable.The validity and applicability of the proposed approach are successfully demonstrated in an illustrative example.     

样本来自AR（1）型平稳过程的控制图

本文利用平稳随机过程的理论,建立了观察值服从一阶平稳自回归模型的控制图,并且将它与样本来自独立同分布随机序列的控制图进行了比较,指出后者是前者的特例。     

水轮机调速系统的混沌特征——控制器参数的影响

提出基于混沌理论和数字仿真方法研究水轮发电机组调速系统的转速控制问题，讨论了控制参数对水轮发电机组调速系统出现混沌现象的影响     

高速公路C50高强高性能混凝土的配制

文章通过试验方法，论证利用漳州本地区的原材料，选用高效减水剂和一级粉煤灰，水泥用量控制在425kg／m^3以内，顸制砼坍落度控制在50mm-70mm，泵送砼坍落度控制在180mm-160mm。也能配制C50的高强度性能砼。     

对称群S_(2γ)的基本旋表示张量积的对称化

这篇论文应用约化记号解决了对于任一γ对称群S_(zγ)的基本旋表示的张量积的对称化问题。