冬季污水处理厂现状及运行管理

简要介绍了淮安市四季青污水处理厂基本概况与主要设备,针对冬季雨雪天气及较低温度情况,对A曝与B曝所呈现的不同问题和现状进行了简述,并根据污泥负荷、效率变化等指标,得出了生物活性相对值随水温变化的曲线,同时还列举了构筑物、机械设备及仪表曾出现过的异常情况,提出了一些可行性对策与预防措施,如提前做好机械设备的维护与保养,在冬季加大A、B段污泥回流比,确保微生物处在较佳状态,从而保证出水达标。     

飞机重载大变形伸缩变体机构动力学仿真研究

目的为适应先进战斗机外形变体需求,设计复杂严重载荷环境下的伸缩机构,在整体弯曲、扭转等大变形条件下发挥支持变体运动和传递大载荷的系统功能。方法针对此类重载大变形伸缩机构,构建一种结合机构动力学和结构动力学的仿真分析方法,综合考虑运动过程中整体刚度分布变化带来的载荷、运动传递特性变化,以及局部轮轨运动组件的接触动力学细节,开展伸缩过程中的动力学仿真。结果计算获取了整个伸缩机构在严重外载荷下的伸缩过程运动参数变化和机构动响应,与典型盒段带载伸缩运动试验测试相比,机构连接交点载荷最大值的计算误差不超过7.9%,自由端位移最大值的计算误差不超过13.2%。结论建立的方法为各组件的传动传载性能优化和结构强度设计分析提供了一种可靠高效的仿真手段,对于变体飞机伸缩运动部件的结构/机构一体化设计有重要的应用价值。     

试论长江流域自然环境的演化

依据青藏高原不断抬升及第四纪红色风化壳的不同性状,论证长江流域河流网系的台阶性特征,抬升的结果使高原东侧与北部高大山系足以阻隔西北寒流的冬季入侵,同时又强化了东南湿润气流的深入与阻滞于四川盆地西部及云贵高原北侧,因而使湿润亚热带生态环境得以深入上游地区。根据江南丘陵广泛分布的第四纪红色风化壳的特征,论证了整个地区均受到新构造运动抬升的影响,并在漫长的时期里处于湿润亚热带环境,成为孑遗陆生、水生物种得以长期存活的条件,同时使长江流域形成水热资源丰富、物种多样的河流网系。     

Adaptation and validation of QuEChERS method for the analysis of trifluralin in wind-eroded soil

This study was carried out to develop and validate a reliable analytical procedure for trifluralin analysis in wind-eroded sediments. Soil sediments trapped in BEST sediment traps were subjected to QuEChERS extraction method, incorporating a simple simultaneous cleanup step, followed by trifluralin analysis with GC-ECD. Results revealed that QuEChERS method offered a potential alternative technique for pesticide extraction from soil samples. The validity of analytical method was performed by the method-performance criteria such as, recovery, LOD, LOQ repeatability, precision, and all found to be within the required limits. It was also observed in this study that herbicide concentrations in the wind-eroded sediment did not vary with the time and trap height. Trifluralin concentrations of surface soil after four erosion events were higher (626.05 μg/kg) than wind-eroded soil (450.08 μg/kg).     

济南市农村居民点用地分析及节约利用对策

随着城市化水平的提高以及城市规模的扩大，耕地日趋减少，城市用地需求量不断增加，用地矛盾加剧。通过对济南市农村居民点用地现状分析，指出了农村居民点用地存在的问题，土地利用程度低、土地资源浪费是农村居民点用地普遍存在的现象。在当前建设节约型社会的形势下，从提高土地利用程度等方面提出了节约用地的措施，指出平原地区是今后土地利用的重点；采取合理的经济措施，是解决农村居民点用地流转的新途径。     

Connectivity in an Agricultural Landscape as Reflected by Interpond Movements of a Freshwater Turtle

Abstract:  Connectivity is a measure of how landscape features facilitate movement and thus is an important factor in species persistence in a fragmented landscape. The scarcity of empirical studies that directly quantify species movement and determine subsequent effects on population density have, however, limited the utility of connectivity measures in conservation planning. We undertook a 4-year study to calculate connectivity based on observed movement rates and movement probabilities for five age-sex classes of painted turtles ( Chrysemys picta ) inhabiting a pond complex in an agricultural landscape in northern Virginia (U.S.A.). We determined which variables influenced connectivity and the relationship between connectivity and subpopulation density. Interpatch distance and quality of habitat patches influenced connectivity but characteristics of the intervening matrix did not. Adult female turtles were more influenced by the habitat quality of recipient ponds than other age-sex classes. The importance of connectivity on spatial population dynamics was most apparent during a drought. Population density and connectivity were low for one pond in a wet year but dramatically increased as other ponds dried. Connectivity is an important component of species persistence in a heterogeneous landscape and is strongly dependent on the movement behavior of the species. Connectivity may reflect active selection or avoidance of particular habitat patches. The influence of habitat quality on connectivity has often been ignored, but our findings highlight its importance. Conservation planners seeking to incorporate connectivity measures into reserve design should not ignore behavior in favor of purely structural estimates of connectivity.     

拼焊板在盒形件拉伸过程中的焊缝移动研究

分析了激光拼焊板在冲压成形过程中焊缝移动的基本原理 ,推导了单向拉伸情况下焊缝移动的基本公式 ;概述了拼焊板数值模拟建模的基本方法 ,并运用商业有限元软件AutoForm对盒形件拉伸过程中的焊缝移动进行了预测 ,将分析结果与国外实验结果进行对比 ,得出初始焊缝位置对焊缝移动的影响的基本规律     

离子地质学——研究地壳中离子运动及其与围岩的相互作用

地壳中存在离子 ,也存在电压。构造应力带中 ,电压比四周高 ,离子迁移快 ,它们与围岩的化学反应强烈。其结果是产生岩石矿物蚀变和地球化学元素重新分布。航空γ能谱测量能较全面精确地反映U、Th、K的重新分布情况 ,是离子地质学的主要研究手段。根据U、Th、K的分布特征带与断裂等构造带无确定关系 ,我们假定生成它们的构造应力不同 ,生成前者的叫离子运动应力 ,生成后者的叫机械运动应力。离子运动应力集中区 ,对成矿有利 ,这种应力集中是必需的全球性的控矿因素 ,而岩石矿物、构造是有条件的局部性控矿因素 ,因此化探找矿效果好 ,地质成矿模式找矿效果差。离子运动应力带交织成应力网 ,应力网就是天然“化工”网 ,网的有利部位形成资源 ,构成资源网。通过研究放射性元素的单元素异常和组合异常的分布规律及它们与非放射性化探异常的关系来查明资源网 ,从而编制国土资源规划利用图。建立航空数字地球 ,航空数字月球和其他航空数字星球 ,能调查评价这些天体的资源和研究它们的构造运动。     

江西省丹霞地貌发育规律及旅游区划研究

江西省燕山—喜马拉雅运动以块断作用为主,形成了一系列断裂隆起带和断陷盆地,白垩纪、早第三纪红层发育齐全。丹霞地貌主要发育于上白垩统紫红色含钙粗碎屑岩中,受盆缘断裂和中幼年河流控制,是晚第三纪以来新构造运动间歇性隆升,伴随着断裂切割、流水冲刷和风化剥蚀的产物。根据陆地卫星TM图像解译和野外实地调查,查明了全省共有丹霞地貌景观资源123处,其中新发现景点78处。丹霞地貌景观主要分布在该省周边丘陵低山区,明显受不同级别河流的流域控制,具带状分布规律,可划分出9个景观集中分布区域。赣东、赣东南丹霞地貌景观最为密集,结合红色旅游和客家文化特色,该区具有强劲的丹霞地貌旅游开发潜力。