GENERALIZATIONS AND CARTESIAN CLOSED SUBCATEGORIES OF SEMICONTINUOUS LATTICES

In this article, the authors mainly study how to obtain new semicontinuous lattices from the given semicontinuous lattices and discuss the conditions under which the image of a semicontinuous projection operator is also semicontinuous. Moreover, the authors investigate the relation between semicontinuous lattices and completely distributive lattices. Finally, it is proved that the strongly semicontinuous lattice category is a Cartesian closed category.

Almost Fixed Points and Fixed Points of Upper [Lower] Semicontinuous Multimap on Locally G-convex Spaces

In this paper, we use the well known KKM type theorem for generalized convex spaces due to Park （Elements of the KKM theory for generalized convex spaces, Korean J. Comp. Appl. Math., 7（2000）, 1-28） to obtain an almost fixed point theorem for upper [resp., lower] semicontinuous multimaps in locally G-convex spaces, and then give a fixed point theorem for upper semicontinuous multimap with closed Γ-convex values.

On <i>M</i>-Asymmetric Semi-Open Sets and Semicontinuous Multifunctions in Bitopological Spaces

The purpose of this paper is to introduce the notions of m-asymmetric semiopen sets and M-asymmetric semicontinuous multifunctions defined between asymmetric sets satisfying certain minimal conditions in the framework of bitopological spaces. Some new characterizations of m-asymmetric semiopen sets and M-asymmetric semicontinuous multifunctions will be investigated and several fundamental properties will be obtained.

SEED SEMICONTINUOUS EMULSION MULTI-COPOLYMERIZATION OF (METH) ACRYLATES WITH HIGH-SOLID CONTENT: EFFECT OF THE OPERATION CONDITIONS

The seeded semicontinuous emulsion multi-copolymerization of butyl acrylate (BA), 2-ethylhexyl acrylate (2EHA), methyl methacrylate (MMA), 2-hydroxyl propyl acrylate (HOPA) and acrylic acid (AA) was used to prepare the acrylic latexes with high-solid content. The effects of monomer emulsion feed rates (R(a)) and (R/E)(E) values, the ratio of emulsifier amount between the initial charge (R) and the addition monomer emulsion (E), on the polymerization reaction features, the viscosities, surface tensions,particle sizes and particle sizes distributions of latexes, T-g and the insoluble fractions of films, the 180 degrees peel strength, tack and holding power of pressure-sensitive adhesive (PSA) tapes, prepared from the latexes, were studied. Experimental study shows that the grafting and crosslinking fraction in the PSA tapes must be controlled within a suitable range to keep the balance of the 180 degrees peel strength, tack and holding power.

Inverse Limit of Spaces of Upper Semicontinuous Functions

Given a compact Hausdorff space X, U(X) denotes the compact Hausdorff space of all the upper semicontinuous functions from X to the unit interval with the dual lim inf topology. Then U is an endofunctor on compact Hausdorff space. It is proved in this note that this functor preserves inverse limits.

Texture evolution during semicontinuous equal-channel angular extrusion process of interstitial-free steel

Semicontinuous equal-channel angular extrusion（ SC-ECAE） is a novel severe plastic deformation technique that has been developed to produce ultrafine-grain steels. Instead of external forces being exerted on specimens in the conventional ECAE,driving forces are applied to dies in SC-EACE. The deformation of interstitial-free（ IF） steel w as performed at room temperature,and individual specimens w ere repeatedly processed at various passes. An overall grain size of 0. 55 μm w as achieved after 10 passes. During SC-ECAE,the main textures of IF steel included { 111} ,{ 110} ,{ 112} ,{ 110} ,and { 110} At an early stage,increasing dislocations induce new textures and increase intensity. When the deformation continues,low-angle boundaries are formed betw een dislocation cell bands,w hich cause some dislocation cell bands to change their orientation,and therefore,the intensity of the textures begins to decrease. After more passes,the intensity of textures continues to decrease w ith high-angle boundaries,and the sub-grains in dislocation cell bands continuously increase. The present study reports the evolution of textures during deformation; these w ere examined and characterized using high-resolution electron backscattered diffraction（ EBSD） in a field emission scanning electron microscope. The mechanisms of texture evolution are discussed.

Upper and Lower Semicontinuity of Solution Sets for Parametric Generalized Vector Quasi-equilibrium Problems

In this paper, two kinds of parametric generalized vector quasi-equilibrium problems are introduced and the relations between them are studied. The upper and lower semicontinuity of their solution sets to parameters are investigated.

LOWER SEMICONTINUITY OF A CLASS OF FUNCTIONALSIN SBV_H

In this paper lower semicontinuity of the functional I(u)=∫_Ωf(x,u,Δ~ _Hu)dx is investigated for f being a Carathéodory function defined on Hn×R×R^2n and for u∈SBV_H(Ω),where Hn is the Heisenberg group with dimension 2n+1,ΩHn is an open set and Δ~ _Hu denotes the approximate derivative of the absolute continuous part Da_Hu with respect to D_Hu.In addition,a Lusin type approximation theorem for a SBV_H function is proved.

UPPER SEMICONTINUITY OF ATTRACTORS FORTHE REACTION DIFFUSION EQUATION

This paper deals with the reaction diffusion equation in domain, Omega = R or Omega = (-L, L) with L < infinity. Let A(L) and A be the global attractor of this equation corresponding to Omega = (-L,L) and Omega = R, respectively. It is showed that the global attractor A is upper semicontinuity at 0 with respect to the sets {A(L)} in some sense.

半参数双重Tweedie复合泊松回归模型的贝叶斯分析

为了分析健康保险行业中出现的半连续卫生保健费用数据,本文提出一类半参数双重Tweedie复合泊松回归模型.在分析中,首先采用修正鞍点逼近的数值方法去近似Tweedie复合泊松分布的密度函数;其次,利用Gibbs抽样技术和Metropolis-Hastings(MH)算法的混合算法获得了模型参数的联合贝叶斯估计;最后,给出了几个模拟研究以及把这些方法用来分析兰德健康保险实验中的卫生保健费用数据.

基于集成计算平台的高强韧铝合金半连铸工艺优化

基于集成计算材料工程(ICME)思想,使用数字化集成计算平台依托ProCAST仿真模拟软件、MATLAB数值分析软件,并使用最优化方法中序列(逐步)二次规划法(SQP),优化了半连续铸造制备直径254 mm的7050铝合金圆锭工艺,得到较优铸造温度为690℃,所得铸锭的残余应力值最小。与传统优化方式,即逐步调整工艺参数并分析模拟结果的方法相比,数字化集成平台迭代进行工艺寻优的效率提高了1倍。在此优化工艺下得到铸锭的屈服强度为218 MPa,抗拉强度为336 MPa。

Comparative study of nudged elastic band and molecular dynamics methods for diffusion kinetics in solid-state electrolytes

Considerable efforts are being made to transition current lithium-ion and sodium-ion batteries towards the use of solid-state electrolytes.Computational methods,specifically nudged elastic band(NEB)and molecular dynamics(MD)methods,provide powerful tools for the design of solid-state electrolytes.The MD method is usually the choice for studying the materials involving complex multiple diffusion paths or having disordered structures.However,it relies on simulations at temperatures much higher than working temperature.This paper studies the reliability of the MD method using the system of Na diffusion in MgO as a benchmark.We carefully study the convergence behavior of the MD method and demonstrate that total effective simulation time of 12 ns can converge the calculated diffusion barrier to about 0.01 eV.The calculated diffusion barrier is 0.31 eV from both methods.The diffusion coefficients at room temperature are 4.3×10^(-9) cm^(2)⋅s^(−1) and 2.2×10^(-9) cm^(2)⋅s^(−1),respectively,from the NEB and MD methods.Our results justify the reliability of the MD method,even though high temperature simulations have to be employed to overcome the limitation on simulation time.

表达猪瘟病毒E2蛋白的重组杆状病毒反应器工艺研究

为建立一套表达猪瘟病毒E2蛋白的重组杆状病毒反应器工艺,提高反应器上猪瘟病毒E2蛋白的表达量,以商业化培养基为基础,通过对关键营养组分添加量的DOE试验设计优化,获得一种组合补料配方,并在3 L反应器上对补料方式进行优化,以最大限度提高细胞密度。进一步在反应器上摸索了通气策略,以精确调控猪瘟E2重组杆状病毒培养过程的营养代谢平衡,解决副产物乳酸和氨过度积累导致细胞活力下降的问题。首次使用半连续补料工艺与渗透压动态平衡相结合的补料策略以及定向调节通气的工艺模式,使猪瘟病毒E2蛋白的表达量由130 mg/L增加至520 mg/L,提高了3倍。将3 L反应器工艺在100 L反应器上进行了连续3个批次的验证,结果猪瘟病毒E2蛋白的表达量均大于500 mg/L,收获猪瘟E2蛋白制备的疫苗抗体均在2周后转阳,且抗体水平持续上升,接种后8周抗体阻断率仍维持在80%左右。综上,3 L反应器工艺能够稳定放大至100 L反应器,建立了表达猪瘟病毒E2蛋白的重组杆状病毒100 L反应器工艺,且100 L反应器上重组蛋白的表达量稳定、免疫原性良好。

α-预不变凸函数的若干性质

考虑了一类广义凸函数——α-预不变凸函数,利用中间点的α-预不变凸性,讨论了α-预不变凸函数与半连续函数之间的关系,得到了α-预不变凸函数的一些性质.

7050合金半连续铸锭中结晶相及其均匀化处理

采用DSC、金相、扫描电镜及能谱分析、X射线衍射相分析等方法,研究了7050合金Φ200mm半连续铸锭的结晶相及其在470℃均匀化处理过程的变化规律。结果表明:7050合金半连续铸锭中存在大量非平衡凝固共晶体,其过烧温度为477℃,共晶体中的非基体共晶相为MgZn2型晶体结构的含AlZnMgCu元素的非平衡第二相;在均匀化处理过程中,该非平衡凝固共晶体不仅向合金基体溶解还转变成Al2CuMg(S相),S相在该合金中的熔化温度为490℃左右;在470℃均匀化处理时,半连续铸锭中含Zn结晶相于12h前全部消失,其中部分形成S相,但在470℃均匀化处理时,S相不能完全溶入合金基体。铸锭中还存在少量的块状Al7Cu2Fe相,该相在均匀化处理过程中基本保持不变。

预不变凸模糊数值函数及其应用

利用本文所定义的上(下)半连续,在一种新序意义下讨论了预不变凸模糊数值函数的若干判定定理.特别地,给出了预不变凸模糊数值函数的刻划定理.最后,作为应用,讨论了一类模糊数学规划问题的严格局部最优解和全局最优解存在的条件.

露天煤矿半连续工艺关键技术研究

针对我国露天煤矿的特点及半连续工艺系统的构成方式，研究了该系统中的若干关键技术问题，包括半连续工艺系统设置技术及环节专题技术，从而提高了半连续工艺在我国露天矿山的应用范围及矿山的经济效益．

高固含量微乳液聚合的研究

采用半连续微乳液聚合法,在复合型乳化剂体系中,进行高固含量微乳液的研究,结果表明,当SDS(十二烷基硫酸钠)与DNS6(乙烯基烷基酚聚氧乙烯磺酸盐)的质量比等于2时,制备了固体质量分数为42%,总乳化剂质量分数为2%的高固含量聚丙烯酸酯微乳液。TEM图片显示,随固含量的增加,乳胶粒子的尺寸变大,分布变宽。

拟半连续格和交半连续格

作为半连续格的推广,引入了拟半连续格的概念。讨论了拟半连续格的基本性质。在拟半连续格上得到了类似于拟连续偏序集的一些主要结果。同时探讨了半连续格、拟半连续格、交半连续格、交连续格、强连续格几种不同结构之间的关系。最后,讨论了半连续函数空间仍是半连续格的条件。

有机硅-丙烯酸酯乳液聚合稳定性研究

采用种子乳液聚合工艺,以过硫酸铵为引发剂、十二烷基二苯醚二磺酸钠(DOWFAX2A1)/辛基酚聚氧乙烯(40)醚(TRIONX-405)为复合乳化剂合成了乙烯基 三(2 甲氧基乙氧基)硅烷(A-172)改性丙烯酸酯聚合物。研究了单体加入方式、乳化剂用量、聚合温度、pH值等对聚合稳定性的影响。结果表明,当总乳化剂质量分数为3 0%、聚合温度为75～80℃、pH=6 5～7 5时,采用净单体滴加法制备聚合物的聚合过程稳定性较好;增加A-172用量,聚合稳定性降低。