Preparation and Characterization of Zeolite Beta with Low SiO_2/Al_2O_3 Ratio

Zeolite beta with a low SiO2/Al2O3 ratio was synthesized by a novel two-step process.The synthesized sample was characterized with XRD,SEM,FTIR,and N2 adsorption-desorption and solid-state MAS NMR.The results showed that aluminium species were inserted into the framework of zeolite beta.The BET surface area,volume,and particle size of the zeolite beta sample decreased with decreasing SiO2/Al2O3 ratio.Our process was proved an efficient route to synthesize zeolite beta with a low SiO2/Al2O3 ratio.     

运用高压旋喷建造土坝坝基灌浆盖板技术

地坝坝基进行帷幕灌浆时，由于坝基无混凝土盖板，不能进行裂隙冲洗，灌浆压力受到限制，因而灌浆效果有限。采用高压旋喷在坝基建造灌浆盖板，改善了灌浆条件，取得了良好的灌浆效果，并且有效地截断坝基表层的渗漏，减少了坝基的接触冲刷破坏，温缺口水库大坝灌浆试验的成功为坝基无混凝土盖板条件下灌浆和坝基防渗加固处理探索了一条新路子。     

共轭高分子三阶非线性光学材料

概述了ｎ－共轭高分子材料的三阶非线性光学性质，着重讨论了化学结构对其光学非线性的影响，说明了ｎ－共轭聚合物的三阶非线性极化率主要取决于共轭主链的结构，侧链取代基的变化对其非线性影响不大，文中展望了共轭高分子材料在集成光学中的应用前景。     

Monolithic Catalysts with Low Noble-Metal Content for Exhaust Purification of Small Gasoline Engines

A series of low noble-metal coment monolithic catalysts for exhaust purification of small gasoline engines was investigated, and it was found that the Pt/Rh-OSM/Al2O3 （where OSM was oxygen storage material） catalyst with Ce0.5Zr0.5-MnOx（3%MnOx） OSM held low light-off temperature for CO, HC, and NO; quite wide three-way window, and outstanding thermal stability. The catalyst could efficiently comrol exhaust emission of small gasoline engines.     

破碎岩体内灌浆抬动破坏的成因分析

文章根据破碎岩体内的工程实践,针对在破碎岩体内灌浆极易出现的"抬动破坏"问题,分析了"抬动破坏"的成因及其与之相关的地质环境和对工程的影响,总结了相应的处理原则和工程措施。     

State observability and condition observability for a class of interacting discrete event systems

This paper introduces the concepts of state observability and condition observability for condition systems, a class of systems composed of discrete state components which interact via discrete binary signals called conditions. Given a set of externally observed conditions, state observability implies that the state of the system can be determined from the observations, and condition observability implies that all unobserved input and output conditions of the system can be determined from the observations. In this paper, we present a class of systems which is state observable and condition observable. We present a method to synthesize an observer system to provide state and condition signal estimates for a single component subsystem.     

Holmium-doped Porous Silicon Prepared by a New Electrochemical Approach and Its Photoluminescence

Ｐｏｒｏｕｓｓｉｌｉｃｏｎ（ＰＳ）ｗａｓｆｏｕｎｄｔｏｅｍｉｔｖｉｓｉｂｌｅｌｕｍｉｎｅｓｃｅｎｃｅａｔｒｏｏｍｔｅｍｐｅｒａｔｕｒｅｂｙＣａｎｈａｍｉｎ１９９０［１］．Ｔｈｉｓｐｈｅｎｏｍｅｎｏｎｉｍｐｌｉｅｄａｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉ...     

诱导结晶条件下硅酸盐水泥熟料形成动力学的研究

根据诱导结晶的原理，我们提出了用已烧好的同类优质熟料作为晶种，诱导水泥烧成过程中的矿物形成。用掺与不掺对比的方法，利用现代物理、化学手段进行了研究。结果表明：明显提高了生料的易烧性；使ｆ－ＣａＯ明显下降；水泥熟料形成的活化能降低；刚分解的ＣａＯ在晶种表面富集；加快了各个阶段的固相反应；加快了熟料矿物形民；熟料矿物质量有所提高；并使ｆ－ＣａＯ的结构特征上发生了易于消解的变化。     

A simple method for determining the Weibull estimator

Abstracts are not published in this journal This revised version was published online in November 2006 with corrections to the Cover Date.     

Ill-conditioned performance functions of queueing systems

Shows that for queueing networks with deterministic or discrete service time distributions, the performance functions can be nondifferentiable at a dense subset of a given interval. The authors also show that when the service time densities are supported on small intervals, the performance function derivatives changes rapidly. The authors prove these results for a two-server cyclic network and then point out a potential generality to other queueing networks. The results indicate that the nonsmooth analysis may be useful in the area of stochastic discrete-event systems