镀锌层表面硫代酰胺化合物彩色配合物的XPS和AES研究

CH3CSNH2、H2NCSCSNH2、H2NCSNHNH2等硫代酰胺化合物在锌镀层表面发生配位化学反应,获得了多种不溶性彩色配合物膜,膜层有良好的装饰性能。XPS和AES分析结果表明,多数硫代酰胺化合物分子中的硫代酰胺基团在参与配位反应时发生了去质子化,N、S均发生了配位,另有部分硫代酰胺基团未去质子化,直接与Zn2 配位。从其AES深度剥蚀曲线的组成恒定区求得了膜层的厚度。     

算术、语文学与犯罪的“滑稽剧”——从维特根斯坦后期哲学看尤奈斯库的荒诞剧《上课》

尤奈斯库戏剧《上课》既充满暴力色彩和荒诞意味,又极具语言哲学意蕴,但通常阐释偏重前者,将其视为对强权统治及其非理性机制的嘲讽和批判,却往往忽略其中独特而深刻的语言哲学内涵。对后者的考察可与维特根斯坦后期哲学形成意味深长的对应。维特根斯坦后期哲学中有关语言的意义和用法、数学逻辑与经验事实、"疼痛"的语法、"实指定义"与"交流呼告"等方面的论述,有助于深入解析《上课》中失败的"语言习得"过程,进而有效地阐释该剧中"算术导向语文学"、"语文学导向犯罪"的离奇逻辑命题。在这部关于犯罪的"滑稽剧"中,算术和语文学授课的荒诞过程和血腥结局,在语言哲学层面凸显了维特根斯坦后期哲学所警示的诸种思维陷阱,并揭示出在权力政治的表层关系之下,隐藏在语言和思维等方面的深层冲突机制。     

基于农户满意度的惠农政策研究

基于农户满意度视角,通过安徽省惠农政策实施情况的问卷调查,运用满意度测评方法对安徽省惠农政策实施绩效进行实证分析.调查表明,整体而言,安徽省现阶段惠农政策农户满意度处于中等偏下水平,但对政府惠农政策的实施表示认可.政策执行过程中,执行人员政策认知程度低,执行手段单一,欠规范以及缺乏有效监督等问题较为突出,严重影响了农户满意度.据此,提出提高基层部门政策执行队伍的素质和能力、建立健全执行力评估制度以及强化责任追究机制等对策建议.     

Computation of final outcome probabilities for the generalised stochastic epidemic

This paper is concerned with methods for the numerical calculation of the final outcome distribution for a well-known stochastic epidemic model in a closed population. The model is of the SIR (Susceptible→Infected→ Removed) type, and the infectious period can have any specified distribution. The final outcome distribution is specified by the solution of a triangular system of linear equations, but the form of the distribution leads to inherent numerical problems in the solution. Here we employ multiple precision arithmetic to surmount these problems. As applications of our methodology, we assess the accuracy of two approximations that are frequently used in practice, namely an approximation for the probability of an epidemic occurring, and a Gaussian approximation to the final number infected in the event of an outbreak. We also present an example of Bayesian inference for the epidemic threshold parameter.     

一类数论函数的零点

对于正整数n,如果存在正整数k可使kn＋1是素数,k｜n-1且（n-1）/k不是合数,则设f（n）表示适此条件的最小的k;否则,f（n）=0.当f（n）=0时,n称为函数f（n）的一个零点.该文证明了：函数f（n）有无穷多个零点.     

算术平均数与强度相对指标辨析

对于算术平均数和强度相对指标这两个在统计学中容易混淆的指标,本文从概念作用不同、分子和分母所属的统计总体不同、分子与分母是否存在汇总关系不同、指标的表示方式不同等方面进行了详细的研究,分辨出本质区别,以促进在统计教学和实际工作中科学正确地运用这两个指标。     

评选计分中的问题及改进方法

由于算术平均数易受极端数据的影响,现行由评委集体评选计分的方法,往往不能反映大多数评委的意见。本文分析了现行评分方法中的问题,提出了三种改进方法。     

二元函数可微性的四则运算与复合运算

本文给出了用定义法证明二元函数可微性的四则运算法则与复合运算法则。     

The variable-interval arithmetic coding using asymptotic deterministic randomness for data compression and encryption

Different from the traditional way which compresses the data first and then encrypts the compressed bit-stream later, a novel compression and encryption scheme using variable model arithmetic coding and coupled chaotic system can encrypt and compress the input plaintext synchronously. However, there will be a compromise between the amount of compression achieved and the amount of security incorporated, because the compression efficiency is determined by the key bit-stream. In this paper, an improved scheme using variable-interval arithmetic coding and asymptotic deterministic randomness has been proposed. The improved scheme is secure because the key bit-stream generated by the asymptotic deterministic randomness can resist previous attacks against chaotic encryption. In addition, the compression efficiency will not change with the key bit-stream, because the statistical model will no longer be changed. The results show that the new scheme can achieve high security and compression efficiency.     

Exact D-optimal designs for a linear log contrast model with mixture experiment for three and four ingredients

This study investigates the exact D-optimal designs of the linear log contrast model using the mixture experiment suggested by Aitchison and Bacon-Shone (1984) and the design space restricted by Lim (1987) and Chan (1988). Results show that for three ingredients, there are six extreme points that can be divided into two non-intersect sets S₁ and S₂. An exact N-point D  -optimal design for N=3p+q,p≥1,1≤q≤2$N=3p+q,p\ge 1,1\le q\le 2$ arranges equal weight n/N,0≤n≤p$n/N,0\le n\le p$ at the points of S₁ (S₂) and puts the remaining weight (N−3n)/N$(N-3n)/N$ on the points of S₂ (S₁) as evenly as possible. For four ingredients and N=6p+q,p≥1,1≤q≤5$N=6p+q,p\ge 1,1\le q\le 5$, an exact N-point design that distributes the weights as evenly as possible among the six supports of the approximate D-optimal design is exact D-optimal.