微磁场条件下pH冲击对微氧活性污泥表面性质的影响

研究了微磁场条件下pH冲击对处理低负荷葡萄糖废水的微氧活性污泥表面性质的影响。在pH=6.0和9.0的条件下对添加磁粉和无磁粉反应器微氧活性污泥进行15 d的冲击,而后调整pH=7.5进行5 d的恢复实验。对pH冲击下污泥絮凝能力FA、疏水性RH和表面电荷SC的变化情况进行考察,结果表明,有磁粉反应器的各项指标均优于无磁粉反应器。经过5 d的恢复实验,添加磁粉反应器污泥的各指标均能恢复到接近初始值,而无磁粉反应器污泥难以恢复到接近初始值。     

考虑预测不确定性的微网优化调度

针对现有技术下由于微网中不可控微源出力预测和负荷预测均存在误差较大而引起微网优化调度结果不准确的问题,提出在传统微网经济调度模型中增加不确定性描述模型,得到不同侧重点下的微网经济优化结果,并对结果进行分析。首先,通过利用区间数描述预测不确定性,并结合隶属度函数推导容忍度概念。其次,在并网运行模式的微网结构上建立以运行成本最低为目标函数的微网优化调度模型,并将该模型转换为区间数形式表示。最后,利用粒子群优化算法并以MATLAB为主要工具对上述模型进行求解,得到微网24 h出力优化区间解结果,并对结果进行详细分析。算例通过对某并网型微网进行分析,验证了所提模型的科学性和有效性。     

稀土Ce掺杂SnSb复合涂层电极的实验研究

采用涂刷热分解氧化法,把无机盐SnCl4·5H2O、SbCl3和Ce(NO3)3·6H2O以一定的配比溶解在有机溶剂异丙醇中制备涂层液,以钛板为基体,制备多组分的涂层电极.考察了不同掺杂量下制备的电极对生活污水的处理效果,并对稀土Ce掺杂SnSb涂层进行了SEM表征,结果表明,在热处理温度为500℃、稀土掺杂量(原子质量比)为Sn∶Sb∶Ce=100∶10∶1的电极降解效果最好;稀土Ce的掺杂有利于锡锑金属氧化物涂层电极的电化学性能的提高.     

Hydrochemical appraisal of groundwater quality and pollution source analysis of oil field area: a case study in Daqing City,China

Environmental Science and Pollution Research - Serious groundwater pollution not only affects the development of enterprises but also threatens the life and health of residents. To explore the...     

Selective effects of fenitrothion on murine splenic T-lymphocyte populations and cytokine/granzyme production

The aim of this study was to investigate in vitro effects of fenitrothion (FNT) on mouse splenic lymphocytes. Here, naïve mice had their spleens harvested and splenocytes isolated. After exposure to FNT for 48 hr: splenocyte viability was measured using a tetrazolium dye assay; cell phenotypes, i.e., B-cells (CD19⁺), T-cells (CD3⁺), and T-cell subsets (CD4⁺ and CD8⁺), were quantified by flow cytometry; and, production of cytokines/granzyme-B was assessed via enzyme-linked immunosorbent assay. The ability for FNT to induce oxidative stress in the cells was evaluated by measuring hydroxyl radical (·OH) and malondialdehyde (MDA) production and changes in glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) activity. The results showed that FNT significantly inhibited splenocyte proliferation, and decreased production of interleukin (IL)-2, interferon gamma, IL-4, and granzyme B, but had no impact on IL-6 production. FNT also selectively decreased splenic T-cell levels but did not induce changes in CD19⁺ B-cells. Further, within the T-cell populations, percentages of CD3⁺, CD4⁺, and CD8⁺ T-cells (particularly CD8⁺ T-cells) were reduced. Lastly, FNT selectively increased MDA and ·OH production and inhibited SOD and GSH-Px activities in the splenic lymphocytes. These findings suggest that, due to oxidative damage, FNT selectively inhibits splenic T-lymphocyte survival and cytokine/granzyme production in vitro.     

Removal of gentian violet and rhodamine B using banyan aerial roots after modification and mechanism studies of differential adsorption behaviors

Environmental Science and Pollution Research - A novel adsorbent derived from banyan aerial roots was prepared via modification and employed to aqueous gentian violet (GV) and rhodamine B (RhB)...     

德国循环经济法简析

德国在世界上最早制定循环经济法，全面系统和规范性地诠释了循环经济的原则、方法，详尽地规定了实施循环经济过程中涉及的政府、公共机构、私营机构、企业、协会和具体责任人的责任、权利和义务，具有很强的技术性、实用性和可操作性，对制定我国类似的法规具有很好的借鉴价值。     

武汉市大旅游网络建设研究

从地理位置、对外经济联系、国内和省内经济地位、旅游资源丰度等方面分析了武汉市发展旅游事业的有利条件；论证了建设以武汉市为中心，向郊区（县）、省内和邻省延伸的旅游网络的必要性和可行性及发展国际旅游的潜力；提出了大力加强景点和基础设施建设，改善周边交通条件，壮大地方航空公司等加快旅游业发展的对策和措施。     

Evolution and interaction of ecological civilization construction pattern from the perspective of path dependence–based on the panel data of Jiangsu Province,China

Environment, Development and Sustainability - Ecological civilization is an advanced form after industrial civilization. Improving China's ecological civilization system will provide developing...     

多时域航空影象与GIS应用——武昌县土地资源变迁分析

通过对武昌县多时域航空影象的判读和 GIS 的快速处理,结合其它辅助数据,对不同时期武昌县土地资源变化情况作了定性、定量和定位的分析研究.研究结果表明,多时域航空影象能较快地获取有关土地资源演变的静态和动态信息。GIS 是进行土地变迁复合研究及县域规划管理的一种有效技术手段。