光折变介质中四波耦合方程的一种解法及应用

提出新守恒量的基础上，推导出光折变介质中四波耦合方程的一种新解法，并讨论了这种解法在分析相位共轭光束动力学行为中的应用。     

Conductivity and flame retardancy of polyaniline-deposited functional cellulosic paper doped with organic sulfonic acids

Two kinds of organic sulfonic acids, i.e., p-toluenesulfonic acid (PTSA) and sulfosalicylic acid (SSA), were used as doping acid to prepare the polyaniline-deposited functional cellulosic paper, and both the conductivity and flame retardancy of the functional cellulosic paper were investigated. The results indicated that both the conductivity and the flame retardancy of the paper composite had a close relationship with the incorporation of doping acid. Both the conductivity and the oxygen index (OI) value increased with the increase of the acid concentration. SSA performed much better than PTSA and the inorganic acids studied previously for both the conductivity and the OI value of functional cellulosic paper. The conductivity of the paper doped with SSA was more stable than that of the paper doped with PTSA, and the OI value only decreased about 1 % within 40 days for the functional cellulosic paper doped with the two doping acids. Compared with the polyaniline-deposited paper doped with PTSA, both the much higher doping level and the much smaller and more compact polyaniline particles deposition were probably responsible for the significantly better conductivity and flame retardancy of the polyaniline-deposited paper doped with SSA.     

非线性再生散度随机效应模型的渐近性质

对非线性再生散度随机效应模型, 该文给出了类似于Barndroff-Nielson, Cox (1989)和Severin, Wong (1992)的正则条件, 基于这些正则条件和Laplace近似, 证明了该模型参数极大似然估计的存在性、强相合性和渐近正态性.     

固体炭对一氧化氮低温催化解离还原反应的影响——Ⅰ.复合催化剂还原活性的考察

考察了担载在活性炭上的以铜、铁为主的复合催化剂对一氧化氮催化解离还原活性的影响,并通过TPR和XRD研究了不同金属组份配比和不同助剂(K、Na)对催化剂性能的影响。结果表明,通过选择不同催化剂配比和添加不同助剂,降低主催化剂在载体炭上的还原温度和提高主催化剂在载体炭上的分散度,将有利于提高催化剂对一氧化氮催化解离还原的活性。文中还采用电镜方法研究了不同组成复合催化剂的金属颗粒大小和Cu、Fe复合催化剂经反应后其表面的形貌结构,发现在这种炭载型复合催化剂上进行一氧化氮催化解离还原反应的过程中,有催化剂表面金属颗粒迁移、生成炭丝和金属颗粒在载体炭上打洞等迹象。     

托卡马克工程试验混合堆概念设计

本文描述了托卡马克工程试验混合堆(TETB-Ⅲ)的概念设计。堆芯等离子体、各类磁体、包层中子学与热工水力、磁体屏蔽等设计协调一致地体现在堆结构设计中。结构设计考虑了各部件维修的需要和冷却剂进出管道的具体安排。燃料增殖只安排在等离子体环的外侧包层,放宽对内侧包层的中子学性能要求,以及实现较低的锂冷却剂磁流体动力学压降等是设计的一些特点。最后,对设计进行了安全性分析和有关放射性的计算。     

Optimal global rates of convergence ofM-estimates for multivariate nonparametric regression

Consider the nonparametric regression modelY=go(T)+u, whereY is real-valued,u is a random error,T is a randomd-vector of explanatory variables ranging over a nondegenerated-dimensional compact setC, andgo(·) is the unknown smooth regression function, which ism (0) times continuously differentiable and itsmth partial derivatives satisfy the Hölder condition with exponent(0,1], wherei ₁, ...,i _d are nonnegative integers satisfying _k ^=1/d i _k =m. The piecewise polynomial estimator ofgo based onM-estimates is considered. It is proved that the rate of convergence of the underlying estimator is under certain regular conditions, which is the optimal global rate of convergence of least square estimates for nonparametric regression studied in [10–11].This work is partly supported by the National Natural Science Foundation of China.     

Introducing lanthanide metal–organic framework and perovskite onto pulp fibers for fluorescent anti-counterfeiting and encryption

The research of anti-counterfeiting and encryption has always been a subject of universal concern all over the world. Herein, lanthanide metal–organic framework (Eu-MOF) and CH₃NH₃PbBr₃ (MAPbBr₃) perovskite were introduced onto pulp fibers (PFs) to prepare fluorescent anti-counterfeiting and encryption papers. Eu-MOF@PFs paper emitted red fluorescence at 254 nm UV excitation. The optimum preparation conditions of Eu-MOF@PFs were 2.5 mmol of Eu(NO₃)₃, 4 h of reaction time and room temperature. When MABr ink was written on Pb/Eu-MOF@PFs paper, the green fluorescent handwriting and red fluorescent paper were observed under 365 nm and 254 nm UV excitation, respectively. The appropriate addition amount of lead nitrate was 0.6 mmol. Pb/Eu-MOF@PFs paper was immersed in MABr solution to prepare MAPbBr₃@Pb/Eu-MOF@PFs paper. Under 254 nm and 365 nm UV irradiations, MAPbBr₃@Pb/Eu-MOF@PFs paper emitted red-green double fluorescence and the quantum yields of which were 3.11% and 2.48%, respectively. The crystal structure of MAPbBr₃ was easily destroyed by polar solution, which realized on/off switching of the luminescence signal for multistage information encryption. The above paper-based fluorescence materials were potential for advanced anti-counterfeiting and encryption applications.

     

非线性再生散度模型的诊断

Abstract. This article discusses the problem of the detection of influential cases in nonlinear re-productive dispersion models (NRDM). A diagnostic based on case-deletion approach in esti-mating equations is proposed. The relationships between the generalized leverage defined byWei et al. in 1998, statistical curvature, and the local influence of the response vector perturba-tions are investigated in NRDM. Two numerical examples are given to illustrate the results.