淡水噬藻体及其他溶藻因子的分布与感染力

研究了不同时空条件下噬藻体的分布与效力的变化.2001年8～11月共采集了18个水样,对14种藻进行直接感染,从其中的5个水样中分离到了噬藻体(蓝藻病毒),它们主要来源于降温以前富营养化池塘的水样,同时分离得到了4株溶藻细菌.在接受直接感染的14种藻中,聚球藻、组囊藻、微囊藻、织线藻、鱼腥藻7120、衣藻及小球藻为敏感种类,而螺旋藻、念珠藻、鞘丝藻、颤藻、鱼腥藻595、鱼腥藻1444、栅藻则为不敏感种类,敏感种类中织线藻受到噬藻体的感染,聚球藻、微囊藻和织线藻受到溶藻细菌的溶解.从富营养化的池塘采集的水样溶藻能力最强,其次为清水(自来水源)池塘,而大中型湖泊与河流水样的溶藻效果最差.随着温度的降低,水样的感染能力下降.     

复合纳米Fe2O3/TiO2可见光催化降解邻甲酚溶液的研究

以复合纳米Fe2O3／TiO2作为催化剂,日光色镝灯为光源,研究了邻甲酚溶液的可见光降解。考察了催化剂制备方法、催化剂使用量、溶液pH、催化剂重复使用等条件对可见光降解的影响。实验结果表明,1％Fe2O3／TiO2（n）对邻甲酚溶液的可见光降解效果最优,比Ti02（p25）的降解率提高了2．6倍。在实验条件下,可见光降解3h,邻甲酚溶液的浓度去除率达95．4％,TOC去除率为72．3％。在较宽的浓度范围内,邻甲酚的反应服从一级动力学反应方程,随着浓度的增大,反应速率常数不断降低。     

大学生突发公共事件舆情演化及主动引导研究

为有效引导大学生突发公共事件的舆情演化,分析了大学生突发公共事件舆情发展过程中主、客体及中间介质3个主要影响因素,探讨了大学生舆情传播渠道、传播特性及传播规律,并基于对大学生突发公共事件舆情演化因素和传播特性的研究,详述了舆情形成、增长、稳定、消减直至衰末的发展演化规律,提出了以“理性监督,及时介入,明确导向,主动引导”为基本原理的舆情主动引导模式.该模式根据不同阶段的舆情特点,对其管理提供相应的引导策略,也可用于提升学生分析信息的能力,促使舆情朝积极方向发展,帮助大学生建立正确的价值观.通过对西安某高校应对Norovirus病毒感染事件案例的分析表明,学校相关部门及老师通过舆情主动引导模式,理性监督并快速反应,可在短时间内有效控制负面舆情.通过及时在官方平台发布对事件处理的进展,可减缓负面舆情的传播和发酵速度,实现舆情正向快速发展,进而缩短事态发展的整个周期.     

Removal of Methylene Blue from Water by Peach Gum Based Composite Aerogels

Journal of Polymers and the Environment - In this study, novel composite aerogels of peach gum/activated carbon (PGAC) and peach gum/graphene oxide (PGGO) were synthesized by freeze-drying method...     

The effectiveness and heterogeneity of carbon emissions trading scheme in China

Environmental Science and Pollution Research - Some developed economies have run emission trading scheme (ETS) to mitigate carbon emissions. However, we know little about the effectiveness and...     

Friction measurements on “anti-slip” floors under shoe sole,contamination, and inclination conditions

Friction measurements were conducted to study the effects of shoe sole, floor, contamination, and inclined angle of the floor surface on friction coefficient. The shoe sole samples included composite rubber outsole samples with and without V-shaped tread design. Unglazed ceramic tiles of both flat and tiles with molded profile design were tested. The contamination conditions included dry, wet, and glycerol-contaminated conditions. The inclined angles included 0°, 5°, and 10°. A Brungraber Mark II slipmeter was used. The results showed that all the four factors affected friction coefficient significantly (p < 0.0001). Flat rubber soles had higher friction coefficients than the soling samples with V-shaped tread design on all tested floors and inclined angles under wet conditions. Flat soles, however, had extremely low friction when tested on flat floors under glycerol-contaminated conditions. The floors with molded grooves perpendicular to friction measurement direction had the highest friction coefficients than all other floor conditions under both the wet and glycerol-contaminated conditions except the wet/flat sole/10° condition. A regression model with a cosine function was established to describe the relationship between friction coefficient and inclined angle of the floor under the experimental conditions. This model is statistically significant at p < 0.0001 with an R² of 0.97.     

Enhanced simultaneous absorption of NOx and SO2 in oxidation-reduction-absorption process with a compounded system based on Na2SO3

Oxidation of sulfite and competitive absorption existed in Na₂SO₃ solution for simultaneous removal of NO_x and SO₂, inhibited the long-term high-efficiency when used for practical applications. A matching strategy was developed to solve these problems. Antioxidants combination was used to retard the oxidation of antioxidant and enhance inhibition of S（IV）(tetravalent sulfur) oxidation. Hydroquinone（HQ） and sodium thiosulfate（ST） showed a positive syner...     

实验室信息管理系统在环境监测站中的应用——以西安市环境监测站为例

根据环境监测站以往的业务特点和存在的问题,引入了基于监测站特色的实验室信息管理系统。笔者重点介绍了西安环境监测站实验室信息管理系统的工作流程和系统组块,反映出系统灵活、严谨的运行特点,以及全面的系统应用功能。此外,描述了本站LIMS快速、高效的运行状况、常见弊端和LIMS实施的局限性。为今后同行业监测站LIMS的建设、实施和应用提供范本和应用经验和建议,促进了环境监测行业的信息化、现代化管理。