城市污水中有机污染物的分布

以城市污水为对象，以0．45μm滤膜，对水中污染物进行分类，利用高效液相色谱(HPIC)对污水中的溶解态有机物分子量分布进行分析，指出该采用的分析方法具有实用价值，研究结果可为城市污水处理工艺的选择提供依据。     

Longwave radiation flux from an urban canopy: Evaluation via measurements of directional radiometric temperature

Longwave radiation flux, an important part of the surface heat budget, is generally represented by εσT_r⁴, where ε is the surface emissivity, σ is the Stefan-Boltzmann constant, and T_r is the measured radiometric temperature. εσT_r⁴ differs from hemispheric emission because the measured radiometric temperature is anisotropic for an uneven surface. This paper analyzes the anisotropy-related error in measurements of longwave radiation flux from a building canopy. The flux difference between εσT_r⁴ and directly measured flux was up to 8% of the directly measured flux, which could be greater than the typical error in measurement of turbulent heat flux over a building canopy. The flux difference increased as the temperature variation within the urban street canyon increased, and also with increasing difference between the incident solar radiation of the building walls and street canyon floors (pavement, roads, ground surface). Theoretical calculations indicate that the flux difference is due to the structure of the building canopy and the temperature difference between the walls and canopy floors. A numerical model of a building canopy heat budget shows that the flux difference increases as the street canyon aspect ratio increases.     

Determining photosensor settings for optimum energy saving of suspended lighting systems in a small double‐skinned office

A photoelectric dimming control system applied to a suspended direct/indirect and indirect lighting system was analyzed to determine effective control options in a small office with double‐skin envelope. Computer simulations were performed for photosensors positioned at three different locations with three specific configurations under three Commission Internationale de l'Élairage standard sky types. Optimum ideal dimming level was determined for each combination of room orientation, photosensor configurations and positions. In general, fully shielded photosensors achieved better control performance among other configurations used for the photosensors on the ceiling and the back wall. The effect of photosensor configurations on dimming system performance was as significant as the photosensor positions. As the penetration of daylight decreased due to the shaded area on the internal envelope, the control system performance deteriorated. The correlation between the photosensor signals and the desktop illuminance levels due to daylight was not significantly meaningful under the lighting systems. Lighting energy savings were determined for the best and good system control performance. Copyright © 2009 John Wiley & Sons, Ltd.     

大倾角和垂直压带式输送机曲线段参数的确定

经分析与数学公式的推导 ,找出了输送机曲线区段正确合理的参数。     

河工泥沙模型相似律研究现状及其存在的问题

河工泥沙模型是研究河流工程问题的重要工具，它是建立在模型相似律基础之上的．文中阐述了河工泥沙模型相似律的研究现状，指出其中存在的一些问题，并提出和介绍了一些处理方法。     

排气筒的有效高度与风帽的设置

排气筒用于高架排放废气和有害气体，通常配置伞型风帽以避雨水。由于伞型风帽的阻碍，废所的垂直排放速度降低，从而减小了排气筒的有效高度。介绍了数种可替代伞型罩风帽的排气筒头部设计。     

悬移质分选沉降及其在工程上的应用

悬移质泥沙占河流输沙的大部分，由于泥沙的重力作用及水流的紊动混掺的双重作用，悬移质沿垂线的分布呈上稀下浓，上细下粗的规律。在水流的不平衡输沙条件下，趋饱和水流中必然有一部分泥沙沉降落淤，其中较粗的泥沙必然率先沉降，较细的泥沙仍随水流悬浮前进。     

Seasonal change in nagilactone contents in leaves inPodocarpus nagi forest

Nagilactones isolated fromPodocarpus nagi (Thunb.) Zoll. et Moritz. are known by their physiological activities as a plant growth inhibitor or antiherbivory substance. As the first step in clarifying the nagilactone dynamics in a forest canopy, the seasonal variations in nagilactone contents in leaves and mass of nagilactones accumulated in the canopy were examined at Mt. Mikasa, Nara City, central Japan. Nagilactone content in mature leaves dropped sharply in May, when new leaves flushed. The nagilactone content of new leaves was far greater than that of mature leaves, implying a translocation of nagilactones from old leaves to new leaves. The total mass of nagilactones in the canopy was 3.9 kg/ha.     

Changes in riparian forests in the Kushiro Mire,Japan, associated with stream channelization

The Kushiro Mire, the largest mire in Japan, presently faces the serious problem of turbid water flooding. Shortening of stream channels associated with agricultural development is a major cause of streambed aggradation. This aggradation reduces the carrying capacity of the channel, resulting in sediment laden water spilling over the wetlands in a flood event. Sedimentation progresses with repeated inundation by turbid water, which significantly alters the edaphic conditions, and thereby the composition and structure of marsh forests. Aggradation of the geomorphic surfaces with sedimentation lowers the water level, and increases soil particle size and nutrient status. This situation was clearly displayed in an ordination of canonical correspondence analysis. Among the environmental variables, water level was related most strongly to the pattern of a forest community. Salix species dominated the flood areas, which were characterized by a low water level, coarse sediment, and high electrical conductivity. Alnus japonica, the most common tree species in the Kushiro Mire, favors soil conditions represented by high water table and organic content. A. japonica adapts to a higher water level by developing lenticels with hypertrophied and adventitious roots, multiple sprouting and regenerates vegetatively. Basal areas (BAs) of A. japonica, however, seem to be limited by high fluctuations in water levels, which are amplified by channelization. This raises serious concerns for the integrity of the Kushiro Mire. It is important to implement a conservation plan from a watershed perspective because most problems originate in upper basins. Creating riparian buffer strips, sediment‐filtering wetlands, and restoring the original meandering course may slow down sedimentation in the mire, and thus help to restore the natural hydrological regime. Copyright © 2002 John Wiley & Sons, Ltd.     

悬吊质量结构的减震性能问题

以严格的数学推导，证明了文献[1]结论的正确性，它可以代替文献[1]与[3]中的统计和对比的方法来找出结论，使其结论更加可信与可靠，它可作为文献[1]的补充。