关注幼小数学课程目标的衔接——基于全美《州共同核心数学标准》K-1年级的内容解读

幼小数学课程目标的衔接是整个幼小数学课程衔接的关键环节,解读全美《州共同核心数学标准》K-1年级部分的内容,认为其在儿童心理与内容制定角度上较好地衔接了幼小数学课程目标。目前,我国幼小数学课程目标的衔接存在一定问题,需要制定幼(学前一年)小统一的数学课程标准;将数学作为学前教育中独立的学习领域;兼顾行为性与展开性的数学课程目标取向;注重幼小数学课程目标内容的衔接。     

认真落实“新36条” 促进非公经济健康发展

结合朔州市非公有制经济发展现状,就如何更好地贯彻落实国务院＂新36条＂,提出了改善软环境、加强引导、制定保障措施等建议。     

关于国家赔偿金“睡大觉”的思考——兼评《国家赔偿法修正案》的修正内容

分析国家赔偿金＂睡大觉＂现象及其原因,评价已出台的《国家赔偿法修正案》的主要修正内容,并针对修正内容的不足提出几点建议。     

基于抗滑力变化的边坡稳定状态识别

随着边坡工程复杂性增加,边坡稳定性分析面临很大挑战。由于坡体滑动具有阶段性,抗滑力的组成也是动态变化的,提出用双安全系数来辨识坡体所处的状态。边坡失稳伴随坡体强度的变化,按其演化过程分为强稳定阶段、弱稳定阶段和破坏阶段。基于极限平衡原理计算常规安全系数(F_s)和安全系数1(F_(s1)),得到边坡稳定状态的判识:当安全系数1大于1时,坡体处于强稳定阶段;安全系数1小于且常规安全系数大于1时,坡体处于弱稳定阶段;常规安全系数小于1时,坡体处于破坏阶段。结合模型试验,得到对应坡体三个阶段的两个安全系数关系曲线,理论上证明了双安全系数方法的可行性。运用分段安全系数方法对已知边(滑)坡状态进行分析,并对其稳定状态进行判识,结果与实际工程地质相符,验证了双安全系数法的可行性。     

加州高等教育之概观与启示——以加州富乐敦州立大学为例

结合在加州富乐敦州立大学的学习考察内容,对加州高等教育的整体概况,以及加州高等教育的管理体制、办学理念、师资队伍建设、教学活动等方面内容做较为详细的总结介绍,并在此基础上,结合个人思考,对我国新建本科院校的发展提出三点建议.     

基于PLC的多岔路口信号灯系统设计

可编程控制器在日常生活中已经得到广泛的应用,文章介绍了应用可编程控制器设计的多岔路口交通信号灯控制系统,并给出了顺序状态图。     

大理国写本佛经整理研究综述

20世纪是大理国写本佛经的集中发现时期,崇圣寺千寻塔、凤仪北汤天、崇圣寺三塔、下关佛图塔陆续有发现。发现后,学者对这些大理国写本佛经进行了著录整理。还有一些学者对大理国写本佛经作过一定的专题研究,如李霖灿、周泳先、杨延福、李孝友、杨名镋、张锡禄、杨世钰、侯冲等。总结前人的研究成果,是为了更好地探讨研究现状,发现不足,为今后进一步研究指明方向。     

A novel thermodynamic state recursion method for description of nonideal nonlinear chromatographic process of frontal analysis

A novel thermodynamic state recursion (TSR) method, which is based on nonequilibrium thermodynamic path described by the Lagrangian-Eulerian representation, is presented to simulate the whole chromatographic process of frontal analysis using the spatial distribution of solute bands in time series like as a series of images. TSR differs from the current numerical methods using the partial differential equations in Eulerian representation. The novel method is used to simulate the nonideal, nonlinear hydrophobic interaction chromatography (HIC) processes of lysozyme and myoglobin under the discrete complex boundary conditions. The results show that the simulated breakthrough curves agree well with the experimental ones. The apparent diffusion coefficient and the Langmuir isotherm parameters of the two proteins in HIC are obtained by the state recursion inverse method. Due to its the time domain and Markov characteristics, TSR is applicable to the design and online control of the nonlinear multicolumn chromatographic systems.     

Enhanced consistency of the Resampled Convolution Particle Filter

Among the convolution particle filters for discrete-time dynamic systems defined by nonlinear state space models, the Resampled Convolution Filter is one of the most efficient, in terms of estimation of the conditional probability density functions (pdf’s) of the state variables and unknown parameters and in terms of implementation. This nonparametric filter is known for its almost sure L₁-convergence property. But contrarily to the other convolution filters, its almost sure punctual convergence had not yet been established. This paper is devoted to the proof of this property.     

STERIC EFFECTS IN REACTIONS OF METAL COMPLEXES. THE LIGAND SUBSTITUTION PROCESSES

Abstract

A model for the calculation of the activation energy for the ligand substitution processes in the metal complexes, occuring in the polar solvents, is suggested. The model takes into account sharp repulsion between the ligands at small distances. The structure of the transition state is analysed depending on the sharp repulsion distance between the ligands, symmetry factor α, and position of the incoming group with respect to the outgoing group (cis or trans). It is shown that for certain values of the parameters cis-substitution may be preferable than trans-substitution.