城市综合防灾与公共安全规划编制

本文介绍了城市综合防灾与公共安全规划编制的指导思想与原则,对城市面临灾害及研究对象层次进行了分类,对城市综合防灾与公共安全规划框架体系进行了探讨,对影响城市的主要灾害提出了防御标准和目标,对城市综合防灾与公共安全防灾保障体系进行了讨论。     

旅游购物体验实证研究——以屯溪老街为例

在文献综述的基础上,以屯溪老街为例,运用单因素方差分析方法,从旅游主客体两个方面探讨了旅游者的购物体验及其差异性。在主体方面,旅游者的职业、收入、年龄等社会经济属性和游览时间、购物花费等旅游行为特性变量构成了购物体验的差异性因素;在客体方面,旅游者对于老街的购物环境、商品和服务属性方面的体验差异性显著。最后有针对性地提出了管理措施。     

Adsorption of basic dye from aqueous solution onto fly ash

The fly ash treated by H₂SO₄ was used as a low-cost adsorbent for the removal of a typical dye, methylene blue, from aqueous solution. An increase in the specific surface area and dye-adsorption capacity was observed after the acid treatment. The adsorption isotherm and kinetics of the treated fly ash were studied. The experimental results were fitted using Langmuir and Freundlich isotherms. It shows that the Freundlich isotherm is better in describing the adsorption process. Two kinetic models, pseudo-first order and pseudo-second order, were employed to analyze the kinetic data. It was found that the pseudo-second-order model is the better choice to describe the adsorption behavior. The thermodynamic study reveals that the enthalpy (ΔH⁰) value is positive (5.63 kJ/mol), suggesting an endothermic nature of the adsorption.     

成都雨水处理利用工程措施探讨

成都降水呈现极强的季节性特征,夏季降水占全年降水的50%左右;降雨水质呈现明显偏硝酸的混合酸性.针对成都地区雨水污染物特征,对当前雨水处理及回用工程中的中水工程、屋顶绿化、调蓄池、绿地系统以及湿地系统在成都应用时所应注意的一些关键因素进行了讨论.     

结构分析中模拟与仿真技术研究

由于像洪水、水灾、地震这样一类自然灾害的原型重复试验几乎是不可能的,因此计算机仿真技术在这一领域的应用具有重要的意义。本文探索了土木工程中模拟与仿真的概念、特征及实现途径,阐述了关于仿真智能化、可视化的技术细节及仿真的基本思路;结合面向对象程序设计（OOP）概念,提出了结构分析程序设计的原则及标准。在此基础上,编写了基于Windows的结构有限元分析软件SmartSEA.     

铝铁锡共聚物的合成及其特性研究

合成制备了铝铁锡共聚物,测定分析了其水解共聚合和熟化过程中的pH变化,并通过扫描电镜和混凝实验对共聚物的晶形貌像和絮凝作用进行了研究。结果表明：Sn^4 具有比Fe^3 ,Al^3 更强的水解活性,它有使共聚物的分子趋于均一的作用;铝铁锡共聚物的最佳配比为：NAl∶NFe∶NSn=5∶5∶3,最佳水解度B^*＝2．0,此共聚物具有比CPAFC更优良的絮凝性能。     

Reproduction in a simultaneous hermaphroditic shrimp, Lysmata wurdemanni: any two will do?

The caridean shrimp Lysmata wurdemanni (Gibbes) displays protandric simultaneous hermaphroditism with out-crossing, but not all males become simultaneous hermaphrodites (euhermaphrodites). In this laboratory study, we attempted to determine why some shrimp remain males. In our experiment, we grew L. wurdemanni from postlarvae to adults in several group sizes and observed their reproductive function. We found that all shrimp reared in isolation become euhermaphrodites. When cultured in a group, the proportion of shrimp remaining male decreased with increasing group size. Except for those that mated within a day, inter-molt euhermaphrodite-phase shrimp (with or without embryos) and inter-molt male-phase shrimp fertilized eggs successfully. On the other hand, euhermaphrodite shrimp can only mate as females and have their eggs fertilized during a narrow post-molt window (less than 12 h) in each molt cycle (10 days). The fertilization rate of male-euhermaphrodite pairs was similar to that of euhermaphrodite-euhermaphrodite pairs. There are at least two non-exclusive explanations for the persistence of male shrimp in a group. In certain group compositions, an individual may gain more reproductive fitness as a large male with multiple mating partners than as a small female with low clutch size. Alternatively, the presence of male-phase individuals, with variable molt-cycle duration (5-8 days), may be necessary to ensure mating. This study is the first direct experimental demonstration of social control of sex change in the decapod crustaceans.     

TEOM法与实验室称重法监测大气中TSP的对比研究

用数理统计的方法计算出TEOM法与称重法监测结果的偏差,用F检验法检验TEOM法与称重法监测结果之间的致性,用r检测法检验TEOM法与称重法监测结果之间的相关性,用t检验法检验TEOM法与称重法监测结果之间的差异,通过对比研究,找出TEOM法与称重法之间的相互关系和规律。     

羧甲基-β-环糊精对土壤中萘的洗脱去除作用

研究了不同浓度的羧甲基－β－环糊精溶液对不同组分土壤中萘的洗脱去除作用,同非离子表面活性剂脂肪醇聚氧乙烯醚的洗脱去除作用比较,讨论了其对洗脱效果的影响因素．结果表明:羧甲基－β－环糊精溶液对土壤中的萘有较好的洗脱去除效果,２０ｇ·１－１的羧甲基－β－环糊精溶液的洗脱率可达９０%以上;洗脱液浓度和土壤质地是影响洗脱去除率的主要因素;适当地增加洗脱液浓度对洗脱去除率有显著提高;与脂肪醇聚氧乙烯醚相比,以羧甲基－β－环糊精溶液作为增溶试剂,对土壤中的弱极性有机污染物进行洗脱处理具有更好的效果