On cauchy problems for the RLW equation in two space dimensions

A cnoidal wave solution of the two dimensional RLW equation of are obtained by elliptic integral method, and the some estimations the uniqueness and the stability of the periodic solution with both x, y to the Cauchy problem are proved by the priori estimations. Biography: Huang Zheng-hong (1956-)     

Computer simulation of the interaction between a wheel and a corrugated rail

The paper discusses the problems of modelling and simulation of the wheel/rail contact in the case when geometrical irregularities of the rail are taken into account. The iterative method for determining the geometrical relationship between the profile of a rigid rail and the trajectory of the centre of a rigid wheel is presented. The computer code that implements this method is a part of the computer model of the wheel/rail system. The model allows the case when the wheel loses contact with the rail and afterwards hits the rail. Simulation analysis is focused on the question as to whether the wheel bouncing off and on the rail may occur under normal operation conditions. The other question is how this bouncing influences the pressure forces between the wheel and the rail, and how it influences the stress distribution within the contact zone.     

非凸多目标优化中真有效解的一个非线性标量化性质

基于Pascoletti-Serafini标量化方法,利用罚函数思想提出了一类新的标量化函数,进而获得非凸多目标优化问题真有效解的充分条件和必要条件.该结果的建立不需要目标函数的像集有界这一条件,故文章是对Akbari等人[J.Optim.Theory Appl.,2018,178(2):560-590]建立的相应标量化结果的改进.     

Light focusing in linear arranged symmetric nanoparticle trimer on metal film system

Benefiting from the induced image charge on film surface,the nanoparticle aggregating on metal exhibits interesting optical properties.In this work,a linear metal nanoparticle trimer on metal film system has been investigated to explore the novel optical phenomenon.Both the electric field and surface charge distributions demonstrate the light is focused on film greatly by the nanoparticles at two sides,which could be strongly modulated by the wavelength of incident light.And the influence of nanoparticle in middle on this light focusing ability has also been studied here,which is explained by the plasmon hybridization theory.Our finding about light focusing in nanoparticle aggregating on metal film not only enlarges the novel phenomenon of surface plasmon but also has great application prospect in the field of surface-enhanced spectra,surface catalysis,solar cells,water splitting,etc.     

流动注射化学发光法快速测定尿液中左亚叶酸钙

在碱性介质中, 左亚叶酸钙对鲁米诺-K3Fe(CN)6体系有显著的增敏作用, 据此, 建立了一种简单、快速测定左亚叶酸钙的流动注射化学发光新方法. 在优化的实验条件下, 该法测定左亚叶酸钙的线性范围为5.0×10-8～1.0×10-5 g/mL; 检出限(3σ)为2.0×10-8 g/mL; 对浓度为1.0×10-6 g/mL的样品进行11次平行测定, 相对标准偏差为1.3%. 将此法用于尿液中左亚叶酸钙的测定, 同时进行回收率实验.     

一般混合似变分不等式的隐式迭代算法

对一般混合似变分不等式的若干隐式迭代算法进行了研究;利用一般混合似变分不等式与不动点问题和预解方程的等价关系,采用分裂技巧和自适应迭代技巧结合,提出了一个求解一般混合似变分不等式的新的隐式迭代算法;并证明了该算法在算子T是g-单调连续的条件下收敛．     

Dioxygen Affinities and Catalytic Oxidation Performance of Co (II) Complexes with Phenol Ether Bridged Dihydroxamic Acids

Synthetic oxygen carriers are of great interest as models to mimic oxygen-carrying metalloenzymes for oxygen storage and transport1,2. Moreover, they possess great significance to realize high efficiency and selectivity catalytic oxidation of organic subs…     

Asymmetric synthesis of α-sulfinylphosphonates in the thiolane series

A series of enantiomerically enriched 2-phosphonothiolane sulfoxides were obtained by diastereoselective S-oxidation combined with kinetic resolution using a chiral oxaziridine. Enantioselective oxidation of the corresponding 2-phosphono-2,3-didehydrothiolanes with the same oxidizing agent led to the corresponding sulfoxides with ee up to 98%.     

Existence and multiplicity of solutions for the Kirchhoff equations with asymptotically linear nonlinearities

In this paper we study the nonlinear Kirchhoff equations on the whole space. We show the existence, non-existence, and multiplicity of solutions to this problem with asymptotically linear nonlinearities. This result can be regarded as an extension of the result in Li et al. (2012).     

Cu-clusters nodes of 2D metal-organic frameworks as a cost-effective noble-metal-free cocatalyst with high atom-utilization efficiency for efficient photocatalytic hydrogen evolution

Several 2D nanosheets of porphyrin MOFs with various transition-metal clusters as metal nodes were prepared via a simple solvothermal method to apply in the photocatalytic hydrogen evolution,in which the hydrogen production rate of the optimal NS-Cu was as high as 15.39 mmol g^-1h^-1.A series of experimental technologies especially cyclic voltammetry （CV） and Mott-Schottky （M-S） had been adopted to investigate the charge-transfer property of photo-generated electron-hole pair...