H3PW12O40-TiO2/膨润土光催化降解甲基橙的催化性能

通过溶胶凝胶制得H3PW12O40-Ti（OH）4凝胶,并柱撑于膨润土层间制备了复合光催化剂H3PW12O40-TiO2/膨润土。由XRD、SEM、EDS对制备的复合光催化剂进行表征测试表明,固载的H3PW12O40-TiO2使膨润土层状结构发生明显变化,柱撑体H3PW12O40-TiO2呈弥散状态,且TiO2为锐钛结构,催化剂为颗粒粒径大小不一、分布松散的复合材料。对甲基橙的H3PW12O40-TiO2/膨润土光催化降解应用表明,掺杂的杂多酸使所制备的复合催化剂光催化活性得到了极大提高,在光催化体系下有较广的pH适应范围,且制备的催化剂具有良好的催化稳定性。在表征分析及应用实验的基础上,提出了H3PW12O40-TiO2/膨润土的强化催化作用原理。     

陆水水库水环境保护与修复对策

在对陆水水库水质、浮游生物等水生态环境现状进行全面调查的基础上,分析了陆水水库水环境的变化趋势。分析结果表明：陆水水库局部水域呈富营养化趋势,水质逐年变差,水华现象频发。针对当前存在的主要问题,提出了生态环境保护与修复的建议,即加强库区污水处理,控制点源、面源和白色污染,逐步实施污染物排放总量控制,并从生物资源养护、饮用水水源保护区生态修复与建设工程、清洁型小流域建设工程、水源涵养林地植被生态修复工程等几个方面,采取水生态系统保护与修复措施。     

基于Simulink的双电磁振动台并机控制方法研究

基于现有双振动台同步驱动控制技术,运用simulink进行系统仿真.通过调节两振动台间的功率驱动信号的大小,可缩小两台问响应的差值,完成振动系统的响应同步控制     

影响军用复杂目标RCS起伏的主要因素分析

为了更好地评估对空情报雷达实际作战能力,对军用复杂目标RCS起伏随各种因素（如频率、视角、极化等）变化的一般性规律进行了分析.运用图形电磁计算（GRECO）方法,根据军用复杂目标高频区RCS估算流程,对影响RCS起伏的主要因素进行了仿真.仿真结果符合理论分析,从而验证了GRECO方法的有效性.     

工作价值观在付出-回报失衡影响中的调节作用

文中在检验三种付出-回报失衡、工作价值观和过度投入对反生产行为与离职倾向的综合影响.通过层次回归方法着重分析了工作价值观的调节作用,结果验证了工作价值观在付出-回报失衡对反生产行为与离职倾向的影响中有显著的正向调节效应.研究表明为减少员工的反生产行为和离职倾向,结合所能提供的回报,工作价值观是企业在招聘选拔时要考虑的重要因素。     

撞击流反应器中导流螺旋片强化撞击过程的数值模拟

为研究导流螺旋片对立式循环撞击流强化撞击过程的规律,提出最优的导流螺旋片尺寸.采用Fluent软件对立式循环撞击流反应器中增加导流螺旋片前、后的撞击过程进行数值模拟,得到了导流螺旋片厚度分别为0、10、20、30mm和螺圈数分别为0、1、2的反应器流场的速度矢量图、特征撞击面上的平均速度和速度均方根差,并对比分析了其传质性能及混合性能.结果表明,增加了导流螺旋片,导流筒内部出现了流线弯曲及流动斜交,提高了流场的各向异性,使流场中速度分层明显,并增大了速度梯度,从而强化了撞击区之外的流场混合.同时,当螺圈数N=1,螺旋片的厚度L=30mm时,反应器内撞击过程中的相间传质效果最好;当不加螺旋片时,反应器内撞击过程中的相间混合效果最好.     

滨海科技新城公园生活多元体设计——以烟台高新科技开发区为例

在中国现代城市化和产业更新的推动下,高新科技新城(区)得到空前规模的快速发展。一些自然环境资源丰富,交通可达性较弱地区也被纳入城市建设用地,而往往这些城市建设用地便是新城区或高新科技开发区的不二之选。在城市特色建设和自然资源保护两方面,高新科技新城(区)都存在诸如人气聚集、环境保护、招商引资等问题。文章通过山东烟台市高新科技开发区城市设计实例,总结滨海高新科技新城的发展特征和设计需求,提炼其设计理念与策略,塑造功能多用、内涵丰富、特色鲜明的城市公园生活体系,旨在为类似的城市规划设计提供借鉴与参考。     

Treatment of anaerobically digested dairy manure in a two-stage biofiltration system

High concentrations of ammonium and phosphate present a challenge to cost-effective treatment of anaerobically digested dairy manure. This study investigated the efficacy of a two-stage biofiltration system for passive treatment of digested dairy manure. The first stage pebble filters were batch loaded. When the slurry-like digested dairy manure was retained on pebble beds, soluble contaminants were removed before liquid infiltrated over 8-17 days. The pebble filters removed 70% of soluble chemical oxygen demand, 71% of soluble biochemical oxygen demand, 75% of ammonium, and 68% of orthophosphate. Nitrogen removal was attributed to the conventional nitrification - denitrification process and novel nitritation - anammox process. Aerobic ammonium oxidizing and anammox bacteria accounted for 25 and 23% of all bacteria, respectively, in the filtrate of the pebble filters. The longer it took for filtration, the greater the removal efficiency of soluble contaminants. The second stage sand filters had removal efficiencies of 17% for soluble chemical oxygen demand, 45% for soluble biochemical oxygen demand, 43% for ammonium, and 16% for orthophosphate during batch operations at a hydraulic retention time of 7 days. Aerobic ammonium oxidation and anammox were primarily responsible for nitrogen removal in the sand filters. Vegetation made an insignificant difference in treatment performance of the sand filters.     

宜昌至杨家脑河段初期冲刷发展过程与趋势的分析

由于三峡水利枢纽蓄水拦沙作用,下游河段将发生冲刷调整.冲刷调整的沿程发展将给防洪、航运、取水等带来影响.本文依据宜昌至杨家脑河段的实测资料,对该河段蓄水后的冲刷纵向和横向发展过程以及发展趋势进行了分析.结果表明:宜昌至杨家脑河段冲刷遵循枢纽下游河段冲刷发展的一般规律,即冲刷自上面下逐渐发展;该河段内单一的顺直河段较弯曲分汊的河段稳定,即冲刷主要集中在河段内的弯曲分汊段;目前受来水条件的限制,宜昌河段冲刷已趋于平衡,而宜都河段目前处于剧烈冲刷期,枝江河段尚未达到剧烈冲刷阶段;未来宜昌河段仍会有一定的冲刷,但是幅度不大,宜都河段将会继续冲刷,逐渐达到冲淤平衡,而枝江河段逐渐进入剧烈冲刷阶段.     

Hydrological Changes of the Irtysh River and the Possible Causes

Hydrological changes of the Irtysh River were analyzed concerning the changes of annual runoff and its distribution features within a year measured by coefficient of variation and concentration degree. Abrupt changes were detected by the heuristic segmentation method. Possible causes of the hydrological changes were investigated considering climate changes and human activities (especially the reservoir operation). The Mann-Kendall method was applied to estimate whether the temperature and precipitation was changed. The increased precipitation in winter may increase the runoff of April. The increased temperature and the decreased precipitation in the flood season may decrease the runoff. At the middle reaches, the impact of the reservoirs at the upper reaches is significant and may be the main factor leading to the abrupt decreases in annual runoff and its intra-annual variability and concentration. The increased water surface area of the reservoirs aggravates the evaporation and leads to annual runoff reduction. The reservoirs regulate runoff by storing water in the flood season and releasing water in the dry season. While at the lower reaches, the annual runoff remained steady and its intra-annual variation and concentration were reduced gradually because the impact of the reservoirs is relative small and the climatic impact may be more relevant.