上海黄浦江两支流河流甲烷含量研究

甲烷是一种重要的温室气体,虽然目前大气中含量远小于二氧化碳,但排放增长率却大于后者.研究区域为上海市黄浦江支流苏州河和淀浦河,通过实验数据对比城郊春夏的甲烷排放的差异,探讨甲烷产生的机制及其与环境因子的关系,这将有助于研究河流甲烷排放对于环境变化的影响.研究结果认为河流甲烷主要来源于水中沉积物,其产生与水质、温度等因素相关;同时甲烷摩尔浓度与硝酸根离子质量体积比存在负相关性,与铵根离子质量体积比和有机碳质量分数存在正相关性.     

Vertex-disjoint rainbow triangles in edge-colored graphs

Let $G$ be an edge-colored graph of order $n$. The minimum color degree of $G$, denoted by ${\delta }^c\left(G\right)$, is the largest integer $k$ such that for every vertex $v$, there are at least $k$ distinct colors on edges incident to $v$. We say that an edge-colored graph is rainbow if all its edges have different colors. In this paper, we consider vertex-disjoint rainbow triangles in edge-colored graphs. Li (2013) showed that if ${\delta }^c\left(G\right)\ge (n+1)∕2$, then $G$ contains a rainbow triangle and the lower bound is tight. Motivated by this result, we prove that if $n\ge 20$ and ${\delta }^c\left(G\right)\ge (n+2)∕2$, then $G$ contains two vertex-disjoint rainbow triangles. In particular, we conjecture that if ${\delta }^c\left(G\right)\ge (n+k)∕2$, then $G$ contains $k$ vertex-disjoint rainbow triangles. For any integer $k\ge 2$, we show that if $n\ge 16k-12$ and ${\delta }^c\left(G\right)\ge n∕2+k-1$, then $G$ contains $k$ vertex-disjoint rainbow triangles. Moreover, we provide sufficient conditions for the existence of $k$ edge-disjoint rainbow triangles.     

通辽地区医疗防保单位消毒质量现状与分析

为了解通辽地区医疗防保单位的消毒状况，1999－2001年对32家医疗防保单位的消毒与灭菌情况进行了调查。各年度监测合格率分别为55.76%、78.93%、90.54%。并对医疗防保单位消毒工作提出了建议。     

Ⅰ级洁净手术室中无影灯直径的确定

采用高雷诺数K-ε二方程模型，从控制污染物的扩散范围和保证工作区乱流度这两个指标出发，对I级洁净手术室内无影灯直径进行了研究，为无影灯直径的选型提供了依据。     

蕴含W5可图序列的最小度和

Gould,Jacobson和Lehel考虑了下述经典Tur偄n型极值问题的变形:对于给定的图H,确定最小的正偶数σ(H,n),使得对于每一个n项可图序列π=(d1,d2,…,dn),当σ(π)=d1+d2+…+dn≥σ(H,n)时,π有一个实现G包含H作为可图的.本文确定了当n≥11时,σ(W5,n)之值,其中Wr是r个顶点的轮图.     

The Chang-Łoś-Suszko theorem in a topological setting

The Chang-Łoś-Suszko theorem of first-order model theory characterizes universal-existential classes of models as just those elementary classes that are closed under unions of chains. This theorem can then be used to equate two model-theoretic closure conditions for elementary classes; namely unions of chains and existential substructures. In the present paper we prove a topological analogue and indicate some applications.     

辽宁大学生身体健康状况的调查研究

运用问卷调查、健康检测及数理统计等方法,对辽宁大学生健康状况及影响诱因进行调查分析。结果表明:大学生身体健康状况基本良好,运动目的性呈现多元倾向。部分学生的认识和行为表现不一致,健康知识的知晓度欠缺,导致身体健康水平不高。提出相应改善对策,为高校实施健康教育、科教兴省提供参考。     

高校图书馆的阅读治疗服务对大学生心理健康的作用

分析了大学生产生心理疾病的原因,探讨了"阅读治疗"对大学生心理健康的作用,提出了高校图书馆开展阅读治疗的措施。