Rheological Behavior and Wear Abrasion Resistance of Polyethylene Oxide/Laponite Nanocomposites

Polymer/layered silicate nanocomposite thin films were developed as clear, transparent coatings. Laponite‐S, which is a synthetic layered clay, was dispersed in a polyethylene oxide matrix and solution cast onto glass slides for further testing. Rheological properties, wear abrasion resistance, and scratch resistance were tested for each sample to examine the nanoparticle dispersion effects on the materials' properties. In this study, we identify and characterize the materials to be used, establish the appropriate conditions for the preparation of polymer/Laponite nanocomposite dispersions, illustrate methods for the development of PEO/Laponite‐S films, and characterize the films. Results on the rheological behavior of PEO‐silicate nanocomposites as a function of Laponite solids loading and PEO concentration, as well as some preliminary wear abrasion properties of the films are presented in this study.     

小颗粒NaY分子筛透明液相导向剂的制备及其性能

小颗粒ＮａＹ分子筛透明液相导向剂的制备及其性能马跃龙，陈诵英，彭少逸（中国科学院山西煤炭化学研究所煤转化国家重点实验室，太原０３０００１）关键词ＮａＹ分子筛，制备，常规导向剂，透明液相导向剂，使用寿命，老化时间ＮａＹ分子筛作为催化剂组成部分广泛应用于...     

氧气氧化法制备三氯氧磷的清洁生产工艺

从"提高分散度、增强换热能力和根治泄漏"入手,对氧化法制三氯氧磷的现存工艺进行了有效改造 新工艺生产过程中无三废排放,原材料利用率接近100%     

具有特定纯净效应折中设计的若干理论及构造

许多因析试验中,试验者只关心指定的一部分因子效应的估计效果.针对此类问题,Addelman(1962)首次提出了折中设计的方法,并定义纯净折中设计以保证指定的因子效应被有效地估计出来,但此类纯净折中设计的分辨度限定为Ⅳ.本文研究了四类全新的折中设计,指定因子效应的集合分别记为{G1,G1×G1}、{G1,G1×G1,G...     

Bounds on the maximum numbers of clear two-factor interactions for 2~((n1+n2)-(k1+k2)) fractional factorial split-plot designs

Fractional factorial split-plot (FFSP) designs have an important value of investigation for their special structures. There are two types of factors in an FFSP design: the whole-plot (WP) factors and sub-plot (SP) factors, which can form three types of two-factor interactions: WP2fi, WS2fi and SP2fi. This paper considers FFSP designs with resolutionⅢorⅣunder the clear effects criterion. It derives the upper and lower bounds on the maximum numbers of clear WP2fis and WS2fis for FFSP designs, and gives some methods for constructing the desired FFSP designs. It further examines the performance of the construction methods.     

Generalized Calderon-Ryaben'kii's potentials

Calderón–Ryaben'kii potentials provide the foundationfor the difference potential method, which is an efficient wayfor solving boundary-value problems (BVPs) in arbitrary domains.This method allows us to reduce a uniquely solvable and well-posedBVP to a pseudo-differential boundary equation. The generaltheory of Calderón–Ryaben'kii potentials is consideredvia the theory of distributions. The definition of Calderón–Ryaben'kiipotentials is based on the notion of a clear trace. The criterionof the clear trace is formulated. Partial differential equationsof the first order and the second order are considered as particularexamples. On the basis of the Calderón–Ryaben'kiipotential theory, a solution of the active sound control problemis obtained in a general formulation. For the first time, thesolution of the problem takes into account the feedback of theactive shielding sources on the input (measurement) data. Theexact transfer of the boundary conditions from the originalboundary to an artificial boundary is also considered.     

基于爬坡约束条件下的多时段竞价模型

本文建立了基于爬坡约束的多时段竞价模型,并通过数据模拟计算,分析比较,从中得出一些有用的结论.这些结论对进一步改善现有的竞价模型可以起到启发指导的作用.     

机载光学整流罩与扫描反射镜尺寸及渐晕的设计分析

为满足机载光电系统的成像作用距离要求,对机载光学整流罩以及扫描反射镜的设计尺寸进行了理论仿真分析计算,并对研制的样机进行了试验研究。以实例形式给出了整流罩设计的作用距离与相关参量的计算结果,讨论了整流罩扫描系统的渐晕大小。装备该整流罩系统的样机,在近万米高空对音速某战机的红外长波扫描搜索距离可达到86 km,红外中波跟踪达到180 km,激光测距达到47 km。结果表明:根据探测作用距离理论模型分析计算,研制的机载光学整流罩及扫描反射镜光学系统达到了设计要求。     

扩散张量成像的人脑模板构建

扩散张量脑模板包含丰富的大脑白质组织信息,在空间标准化或者脑图谱创建中具有重要价值,然而基于扩散张量模型构建的脑模板精度不高,特别是在脑部复杂的神经元微观结构区域中应用受到限制.针对这一问题,研究者们提出了基于高分辨率扩散成像构建大脑模板的方法.本文对使用扩散张量成像方法进行脑模板构建的研究进展进行了综述,首先介绍了扩散张量脑模板构建的发展进程,阐述了脑模板构建中解决的技术问题及同时存在的局限性;接着详细论述了基于扩散频谱成像及高角度分辨率扩散成像构建脑模板的不同方法间的差异,并总结了这些研究方法取得的重要进展;最后通过分析目前研究进展提出该研究问题中存在的不足以及未来的发展趋势.     

Weak minimum aberration and maximum number of clear two-factor interactions in 2m-p Ⅳ designs

Both the clear effects and minimum aberration criteria are the important rules for the design selection. In this paper, it is proved that some 2m-p Ⅳ designs have weak minimum aberration, by considering the number of clear two-factor interactions in the designs.And some conditions are provided, under which a 2m-p Ⅳ design can have the maximum number of clear two-factor interactions and weak minimum aberration at the same time.Some weak minimum aberration 2m-p Ⅳ designs are provided for illustrations and two nonisomorphic weak minimum aberration 213-6 Ⅳ designs are constructed at the end of this paper.