电子商务教学中应注重联系生活培养学生能力

本文主要介绍在电子商务教学过程中如何使教学更贴近生活实际,培养学生解决实际问题和学习的能力。知识经济是创新型经济,教育自身要有创新型观念的运作方式,培养有知识、有创新技术和攻坚能力的人才,以及这些人才渴望知识、终生学习的意识。     

环境因素对海洋动物Na+-K+-ATPase的影响概述

概述了Ｎａ＋－Ｋ＋－ＡＴＰａｓｅ的一般性质以及各种环境因子对其的影响情况和作用机理，并对Ｎａ＋－Ｋ＋－ＡＴＰａｓｅ活性作为环境污染指示物的可行性进行了初步探讨     

甲基汞神经毒性检测和评价效应指标--即刻早期基因研究

论述了甲基汞神经毒性研究现状，通过分析即刻早期基因（IEG）在甲基汞神经毒性机制中的作用，得出即刻早期基因能作为甲基汞神经毒性检测和评价的效应指标，同时也简要介绍即刻早期基因的研究方法，并指出利用基因芯片技术能够被步筛选出甲基汞对大鼠脑基因表达影响的相关基因。     

热带海洋环境中BHC和DDT的行为特征研究Ⅰ.中国珠江口区旱季BHC和DDT的含量与分布

本文于1994年11月用气相色谱法研究了旱季珠江口区环境中BHC和DDT的含量与分布。结果表明，表层海水BHC含量为0.187μg/L，DDT为0.080μｇ/L；底层海水BHC为0.117μｇ／L，DDT为0.506μｇ／L。沉积物BHC为11.15×10－9（干），DDT为33.46×10－9（干）。海水中的盐度、DO、C     

壬基酚聚氧乙烯醚在污水处理过程中的迁移转化行为

用正相色谱－质谱联用法（NPLC－MS）分离分析高聚合度的NPnEO(n＞2）,用气相色谱－质谱联用方法（GC－MS）测定其中的NP,NP1EO和NP2EO浓度,对NPnEO在城市污水处理厂的迁移转化行为进行了研究。在污水处理厂的进水中,检测出NP和NPnEO(n=1-23）,总浓度为174nmol/L,其中NP2EO的浓度最高,为89．6nmol/L;其次分别为NP（42．2nmol/L）和NP1EO（12．2nmol/L）;出水中同样检测出NP和NPnEO(n=1-18),其中NP2EO的浓度最高,为37．2nmol/L;其次分别为NP（6．64nmol/L）和NP1EO（0．135nmol/L)。在城市污水处理过程中,NPnEO从高聚合度降妥成低聚合度,NP和NPnEO的总去降率为71％。另外,NP和NPnEO在污泥及污泥过滤水中的分配表明污泥对NPnEO有明显的吸附作用,并近似符合Dubinin-Astakhov等温吸附。     

水解酸化—厌氧工艺处理高浓度抗生素废水研究

研究了水解酸化与厌氧消化组合工艺处理高浓度抗生素废水,结果表明,水解酸化反应器最大CODcr容积负荷达到 16.84kg/m3·d,复合厌氧反应器CODcr容积负荷达到8.57kg/m3·d;系统进水SO42-浓度为1325mg/L,CODcr/SO42-值最低达到 3;CODCr与SO42-总去除率分别为75.5％和95.2％,对各种抑制物质和冲击负荷表现出很好的适应性。     

Effectiveness evaluation of water-sprinkling in controlling urban fugitive road dust based on TRAKER method: A case study in Baoding, China

Fugitive road dust (FRD) contributes a great deal to urban rainwater and air pollution and is commonly controlled by water-sprinkling in most Chinese cities. However, there is a lack of information on its effectiveness. We used the Testing Re-entrained Aerosol Kinetic Emissions from Roads (TRAKER) method to monitor different types of roads in Baoding city before and within 1 hr after water-sprinkling and obtained the road dirtiness index (a) and PM concentration in the road environment ($T_{\mathrm{T}}^{*}$), to evaluate the removal efficiency for PM deposited on the road surface (${\eta }_a$) and the reduction efficiency for the PM concentration in the road environment (${\eta }_{\text{PM}}$). The results give that the ${\eta }_a$ for three types of roads is ranked: branch road (87%-–100%) > major arterial road (80%-83%) > minor arterial road (68%-77%), and the ${\eta }_{\text{PM}}$ ranked: minor arterial road (70%) > branch road (46%-58%) > major arterial road (37%-53%). The ${\eta }_a$ and ${\eta }_{\text{PM}}$ varied non-linearly with time and presented a quadratic curve. The average effective control time (${\eta }_{\mathit{a}}$> 0) was 62 min on the major and minor arterial roads, and much longer than 1 hr on branch roads. The ${\eta }_{\text{PM}}$ values diminished completely by 72 min on average from the end of sprinkling for the three types of roads. Water-sprinkling can remove PM₁₀ particles from the road surface and reduce their concentration in the road environment more thoroughly than PM_2.5. Our findings could be helpful for controlling urban FRD emissions more efficiently and precisely.     

Population growth, management and environmental degradation in China

Environmental problems in China can be divided into two large classes: pollution and destruction of natural environment. Environmental degradation is particularly serious in areas with rapid population growth. In this paper, some of China's major environmental problems, particularly those concerned with land, forests, and continental waters are introduced in order to see how population growth and management have affected these resources over the past few decades. It is also explained how the Chinese plan to cope and eventually solve these problems.     

速灭菊酯在水稻-水-鱼系统中的动态

采用同位素示踪技术和模拟生态系统试验法,对水田施用速灭菊酯后对邻近水域的污染、水域中鱼类对速灭菊酯残留物的浓缩和排除等进行了研究,结果表明,在田表水中,残留物浓度随处理后时间而迅速降低。水系中淤泥对水中残留物有明显的吸附净化作用,鱼对水中速灭菊酯残留物的摄取和排除均很迅速。 用二室模型对速灭菊酯残留物在田表水中的消失、用一级输入和输出的单室模型对鱼体中残留物浓度随时间的变化动态研究表明,在田表水中,土壤对水中残留物起着强烈的吸附净化作用;在水系中,鱼体中残留物浓度的消长主要取决于残留物自身在水中的消失速率,只是在前期同时依赖于鱼体对残留物的排除效应,鱼体的摄入常数只对鱼体累积浓度最大值及到达最大值的时间T_m产生影响。     

铁屑微电解法预处理硝基氯苯生产废水的研究

研究了铁屑微电解法预处理某农药厂硝基氯苯生产废水。实验结果表明，铁屑微电解法可有效降低废水CODcr和色度，显著提高废水可生化性。废水经处理，CODcr去除率为73％，色度去除率达90％，BODs／CODcr从0．06提高到0．31。通过实验确定了最佳工艺条件,并探讨了各主要因素对处理效果的影响。另外，本文还分析了废水可生化性提高的原因。