Mo-Mn/TiO2催化剂的协同脱硝脱汞特性

采用浸渍法制备Mo-Mn/TiO₂催化剂,研究了反应温度、HCl和SO₂对其模拟烟气协同脱硝脱汞活性的影响.研究表明,过高的反应温度不利于汞的脱除过程,过低的温度则抑制脱硝反应的顺利进行,但在200℃时可兼具最优的脱硝和脱汞效率;HCl的加入促进汞的高效氧化,却明显降低催化剂对NO的转化;而烟气中SO₂的存在对催化剂的脱硝和脱汞过程均起到抑制作用.利用XRD、H₂-TPR和XPS等表征手段对硫中毒反应前后的催化剂进行了研究.结果表明,硫酸盐在催化剂表面的不断沉积和活性组分Mn⁴⁺及化学吸附氧O_α的消耗乃是致使催化剂失活的主要原因;另外,SO₂与NH₃和Hg⁰对催化剂表面活性位点的竞争吸附,也严重抑制催化剂的脱硝和脱汞反应.Mo-Mn/TiO₂的脱硝过程是通过Mn价态之间的相互转化来完成的,其中元素Mo和O₂是其转化得以实现的助剂;Mo-Mn/TiO₂对汞的脱除以催化氧化为主,金属氧化物中的晶格氧将Hg⁰转化为HgO而被脱除.     

湿润亚热带典型白云岩流域的水文水化学动态特征初步研究——以贵州施秉黄洲河流域为例

利用水文水化学自动监测仪,于2018年5月18日至2018年12月3日期间对地处湿润亚热带季风气候条件下的贵州省施秉世界自然遗产地境内的黄洲河白云岩小流域进行了高时间分辨率的连续监测,目的是为了揭示湿润亚热带季风气候区典型白云岩小流域不同时间尺度与不同降雨强度下水文水化学动态特征。研究获得了黄洲河白云岩小流域的降雨量、出口流量、水温、电导率、pH、方解石及白云石饱和指数、CO_2分压等连续数据。结果表明:(1)黄洲河流域出口河水的pH、电导率、CO_2分压、方解石及白云石饱和指数等指标具有明显的日周期变化规律,即水温、pH、方解石及白云石饱和指数与气温的昼夜周期变化曲线相似,而电导率、CO_2分压与气温的日周期变化曲线相反;(2)黄洲河流域出口河水的水化学指标对不同强度的降雨会产生不同变幅与变化方向的响应特征,暴雨会显著干扰河水水化学指标的日周期变化规律,主要表现在随着降雨强度的增大,电导率与CO_2分压呈现显著下降;(3)白云岩流域具有明显的化学稳态行为。     

黑藻腐解对水-底泥-黑藻系统中磷迁移转化的影响

在步入式模拟实验室内,通过控制温度、光照等措施模拟水-底泥-黑藻系统,设置对照组和30g黑藻组、60g黑藻组自然腐解,检测黑藻衰亡腐解期间黑藻生物量及水、底泥和黑藻中总磷及各形态磷含量的变化,从而探讨磷在该系统内的迁移转化。结果表明:黑藻腐解具有明显的阶段性,实验初期分解速率明显高于实验中后期。黑藻组DO总体变化趋势一致,均先下降再升高,pH值在实验期间整体变化不大,变化区间均为7.4~8.4。对照组与30 g黑藻组中ORP总体呈先上升再下降趋势,60 g黑藻组ORP呈先下降后上升趋势。在整个研究阶段,磷含量上升幅度排序为60 g黑藻组>30 g黑藻组>对照组。黑藻的腐解改变了系统中磷元素的循环,在腐解前期抑制底泥中磷的释放,腐解后期促进磷的释放,并对各形态磷的迁移转化有明显影响。     

Conflict values and team relationships: conflict's contribution to team effectiveness and citizenship in China

Although conflict has traditionally been considered destructive, especially in collectivist societies like China, recent studies indicate that valuing and approaching conflict can contribute to effective teamwork. A hundred and six pairs of employees and their leaders were recruited from State Owned Enterprises in Shanghai and Nanjing. Employees described their conflict values and relationships. Their immediate supervisors rated the effectiveness of their teams and the extent of their citizenship behavior. Results indicate that positive conflict attitudes and approaching conflict can contribute to strong relationships, which in turn strengthen team effectiveness and employee citizenship. Findings suggest that how conflict values affect relationships and outcomes are more differentiated than originally expected. Results were interpreted as supporting the traditional idea that relationships are critical for effective organization work in China but also challenging future research to understand the processes by which conflict has a positive contribution to work relationships. Copyright © 2003 John Wiley & Sons, Ltd.     

APPLICATION OF TABU SEARCH TO GROUND WATER PARAMETER ZONATION1

ABSTRACT: The spatial distribution of hydrogeologic parameter is an important issue in ground water simulation. One of the methods is to divide an area into several zones such that parameters are assumed to be constant within zone. The purpose of this study is to apply Tabu Search (TS) to find the best zonation of parameters that can result in the best ground water simulation. The initial zonation can be determined as the Thiessen method, and then zonation is optimized by T.S. The mean square error between simulated and observed hydraulic heads was used as the objective function. A designed confined aquifer with known zonation was used as an example to test the proposed method. Results indicated that Tabu Search can locate the optimal zonation successfully and avoid being trapped by local optimal zonations. Besides this, four other arbitrary initial zonations can be directed to the optimal zonation by TS, which proves the robustness of the proposed method. The method proposed in this study is feasible and expected to work well in the field problems with sufficient sampling of concerned parameters.     

开发区规划的土壤环境影响评价

以某开发区为例，结合规划的产业结构、经济发展规模、用地布局等，采用类比分析法和数学模式法，预测规划的土壤环境影响，并提出污染减缓措施。     

安宁市环境噪声污染及防治控制措施

分析了安宁市环境噪声质量状况、主要来源和污染原因，提出了防治及控制措施。     

操作、维修合二为一的设备管理新模式探讨

介绍了韶钢第二轧钢厂推行以作业长制为基础 ,实施“操维合一”全员设备管理新模式的必要性和认识 ,阐述了该模式对设备隐患消除的意义 ,总结了实施“操维合一”的具体作法和步骤 ,收到了明显的效果     

暖通空调系统节能措施探讨

在现代建筑节能体系中,暖通空调系统具有十分重要的作用。节能技术之研究与运用,是暖通空调系统节能的组成部分之一,而政府部门的关心与重视,则能充分节能,产生较为显著的社会效益,促进社会经济的快速发展。文章从不断提高系统的控制水平、应用变频技术实现节能效果、推广使用可再生能源的空调系统、尽量减少输送系统产生的动力能耗、使用新型节能的健康空调运行方式等五个方面探讨了暖通空调系统的节能措施。