城镇天然气管道输送工程环境风险评价探讨

在城镇天然气管道工程的环境影响评价中,环境风险评价是重点内容之一。在介绍环境风险评价基本概念的基础上,对天然气管道输送和城镇管网工程的环境风险类型（如泄漏、爆炸）进行了半定量评价。分析如何加强环境风险管理的方法和措施,为环境管理部门提供管理和科学决策的依据。     

快速生物活性测定方法的仪器化

好氧活性污泥法在污水处理中应用广泛.保持污泥活性,是良好处理效果的前提,也是运行控制的主要目标.活性污泥的呼吸速率,或者氧利用速率(oxygen uptake rate,OUR),能够指示污泥的活性变化.本研究开发的快速生物活性测定仪(rapid biological activity tester,RBAT),能够快速测定污泥活性参数,满足工程设计与运行的迫切要求.     

国土空间规划中的承载力反思：概念、理论与实践

资源环境承载力是国土空间规划的科学基础和约束条件。通过梳理承载力概念、理论和实践应用的发展,指出其在研究应用中存在概念边界模糊、评价偏向于指标计算、承载力传导机制研究不足等问题。国土空间规划体系改革,以及新时代生产生活和发展方式变革对国土空间规划提出了新的要求。支撑空间规划编制的承载力评价应进一步明确承载力的概念内涵、明晰承载力内在机制、构建承载力评价体系;在实践应用中应当根据国土空间规划和空间治理的新变化新需求,支撑空间规划的新目标、切合空间治理的新模式、顺应空间治理的新手段,为确定国土空间开发利用与保护修复的主要指标、战略部署,以及指标约束传递与地域功能传导等提供科学依据。     

我国道路交通信号控制机认证框架体系探讨

针对目前我国道路交通信号控制机产品存在的质量问题,对信号机生产企业进行深入调研,详细分析信号机发展现状、国内外产品认证制度及信号机强制检测制度等,并结合我国交通信号机产品自身的特点和实际,参考国外产品认证模式、认证流程,提出我国信号机产品以型式试验、初始工厂检查和获证后监督为模式的认证框架体系。信号机产品质量认证框架体系的建立,对提高产品质量,规范行业生产,将发挥积极的促进作用,同时也为我国交通安全产品的质量控制提供了新思路。     

超高压输电线路电磁场影响及防治

近年来国家超高压电网的建设发展迅速,使得降低工程运行期间电磁场对环境的影响成为当前重要的研究课题.以钦州、防城港电厂送出500 kV输电线路工程为例,简要分析了工程电磁场及无线电干扰对环境的影响,提出了切实可行的环保措施,以将其带来的负面影响减轻到最低程度.     

典型220 kV交流输电线路电磁场分布

通过理论计算和实际测量,揭示220 kV输电线路下的电磁场强度分布情况.从实际测量结果来看,输电线路下电磁场强度高于环境背景值,但均低于国家标准限值.     

Social transmission of food handling in the context of triadic interactions between adults and young canaries (<Emphasis Type="Italic">Serinus canaria</Emphasis>)

We studied the factors that enhance food recognition and consumption in young canaries when confronted with adults. In contrast to previous studies on canaries, in which social transmission of food habits was studied in the context of dyadic interactions (one juvenile–one adult), we proposed a more realistic framework in which young canaries were studied in the context of triadic interactions, free or not, with adults of both sexes. We found that during free interactions, the young bird only eats with a familiar male and that this association enhances the social transmission of seed handling. When the juvenile was separated from the adults by a transparent partition, it only learned to husk seed if it was present at the feeder at the same time as a familiar adult acting as a demonstrator. The presence of adults that are familiar but do not act as demonstrators does not facilitate social transmission of handling. However, the presence of a familiar, demonstrating female had also no effect on this transmission. Coordination of the actions of the experienced bird and of the naive subject is required for social transmission to occur. Action coordination does not depend solely on the level of familiarity between partners but also on the role played by the demonstrator (here, the adult male) that looks after the juvenile during its transition towards independence.     

Experiments on mixing and dissipation in internal solitary waves over two triangular obstacles

A series of laboratory experiments was undertaken in a stratified two-layer fluid to investigate the energetics of the interaction between an internal solitary wave (ISW) and triangular obstacles, as well as to determine the partitioning of ISW energy and its subsequent dynamics. The ISW energy was dissipated as a result of internal breaking and turbulent mixing induced by wave instability. Tests involving different combinations of triangular obstacles in various heights and intervals and ISW of different amplitudes were performed. The wave features resulting from the interaction of an ISW and double obstacles were found to differ from those of single obstacle. The incident energy of an ISW was either reflecting back from the obstacles, dissipated through turbulent mixing, or transmitted over the double obstacles. Reduction in wave energy increased as the intervals between obstacles reduced. For two obstacles in different heights, energy dissipation was greater in the case with a higher obstacle ahead of a lower one. However, the overall performance was dependent on the relative height of the obstacles, relative water depth of the upper and bottom layer, in addition to the intervals between the obstacles.     

Fish forewarning of comprehensive toxicity in water environment based on Bayesian sequential method

Environmental impact of pollutants can be analyzed effectively by acquiring fish behavioral signals in water with biological behavior sensors. However, a variety of factors, such as the complexity of biological organisms themselves, the device error and the environmental noise, may compromise the accuracy and timeliness of model predictions. The current methods lack prior knowledge about the fish behavioral signals corresponding to characteristic pollutants, and in the event of a pollutant invasion, the fish behavioral signals are poorly discriminated. Therefore, we propose a novel method based on Bayesian sequential, which utilizes multi-channel prior knowledge to calculate the outlier sequence based on wavelet feature followed by calculating the anomaly probability of observed values. Furthermore, the relationship between the anomaly probability and toxicity is analyzed in order to achieve forewarning effectively. At last, our algorithm for fish toxicity detection is verified by integrating the data on laboratory acceptance of characteristic pollutants. The results show that only one false positive occurred in the six experiments, the present algorithm is effective in suppressing false positives and negatives, which increases the reliability of toxicity detections, and thereby has certain applicability and universality in engineering applications.