Biophysical Model of Larval Yellow Perch Advection and Settlement in Lake Michigan

Potential for large-scale physical transport processes to affect recruitment of Lake Michigan yellow perch (Perca flavescens) was studied by examining the variation in larval distribution, growth rate, and settlement during June–August 1998–2003 using a 3D particle transport model linked with an individual-based bioenergetics growth model. In all years, virtual larvae were released nearshore in southwestern Lake Michigan, a known and important spawning region for yellow perch. For any given year, the same circulation pattern and water temperature either promoted or reduced yellow perch settlement depending on the consumption rates and settlement size chosen in the growth model. Increased consumption increased the number of settled larvae and expanded the total area where larvae settled, whereas increased settlement size reduced the number of settled larvae and reduced the overall settlement area. Interannual variability in circulation patterns and water temperature also resulted in contrasting larval settlement rates, settlement locations, and size of settlement areas between years. Model predictions were most consistent with field observations of age-0 yellow perch from Illinois and Michigan waters when settlement was assumed to occur at 50 mm. Moreover, our model suggests that larvae originating from southwestern Lake Michigan can recruit anywhere within the southern basin and even in the northern basin. Future model improvement will require information on the relative contribution of various sectors to the larval pool, their distribution with reference to the hydrodynamic landscape, the feeding and growth of yellow perch during their pelagic phase, and the size at transition to demersal stage.     

Integrated modeling and assessment of water resources and water environment in the Yellow River Basin

An integrated model is established to simulate both hydrological processes and accompanied pollutant transfer processes in the Yellow River Basin. The model couples distributed hydrological model WEP-L (Water and Energy transfer Processes in Large river basins) and a newly developed water quality module which includes simulation functions of soil erosion and sediment transport, and non-point and point sources transfer to rivers. To overcome the defects of traditional water quality assessment, two aspects of improvement are conducted. One is the improvement of the traditional characteristic channel length approach, i.e., the product of multiplying channel length by lateral section area is selected as a new assessment criterion to reflect the different contributions of small channels and big ones, thus making the assessment results more objective. The other is the suggestion of integrated assessment approach for both water at channel lateral sections and water generated in sub-basins. The assessment results in the Yellow River Basin illustrate: (1) the improved characteristic channel length approach shows rivers of water quality worse than Class III account for 75% whilst the traditional approach give a result of 45%, implying that the actual status of water quality is worse than the traditional understanding; (2) the quality of water generated in sub-basins is much better than the quality of water at channel lateral sections. The assessment results describe the status of water resources quantity and quality from different points of view and thus provide valuable information for the water resources development and management in the basin.     

资产管理模型及其应用

简要介绍了水电厂资产管理系统的构成，从中引出了以设备为中心、以工作单为主线的资产管理模型，并说明了该模型在水电厂资产管理系统中的应用效果。     

波浪作用下空心块体稳定性分析初探

通过二维物理模型试验,探讨了暗基床上空心块体在规则波作用下的失稳模式。通过试验观察发现,当空心块体内有一定高度的填料时,波浪正向作用下空心块体首先倾覆失稳。本试验测量了作用在空心块体上的波浪力,并与同尺寸沉箱所受的波浪力进行对比,结果显示在波峰时空心块体所受的总水平波浪力比相同波浪作用下的沉箱所受力小而波谷作用下空心块体所受的总水平波浪力却比相同波浪作用下的沉箱所受波浪力大。鉴于上述实验观察结果,空心块体的主要失稳模式分析方法应作进一步研究。     

螺杆泵举升性能模糊综合评价

对螺杆泵举升性能的影响因素进行了综合分析，建立了螺杆泵举升性能综合评价的指标体系，并利用模糊数学方法确立了该系统的综合评价模型，将该模型应用于2台GLB500—12型螺杆泵，其评价结果与在实际工作中的产液量和寿命的综合指标基本吻合，从而验证了该方法的正确性，为螺杆泵举升性能的综合评价提供了一种有效方法。     

割缝防砂筛管抗挤强度有限元计算模型

针对割缝防砂筛管周围或缝内部堵塞，造成井眼压力增加，可能会导致筛管被挤毁的问题，采用有限元方法，通过大型有限元程序，建立了其抗挤强度的有限元计算模型。根据弹塑性理论，对割缝防砂筛管进行分析，得出其抗挤强度。结果与国外的实验数据进行对比，数值模拟结果比实验值略大，但两者相差较小，证明了该模型的正确性。为其他尺寸割缝筛管的抗挤强度设计提供了一种数值计算方法。     

Proposed modification to the CIECAM02 colour appearance model to include the simultaneous contrast effects

A modified CIECAM02 colour appearance model, named CIECAM02‐m2, is proposed to enable CIECAM02 to predict the simultaneous contrast effect. The structure of the CIECAM02‐m2 is a development from CIECAM02, and contains two different procedures for modifying the reference white; one is for lightness and the other is for hue. The model was tested using a data set accumulated in this study and the LUTCHI data. The CV values for three colour attributes between predictions and experimental data were used to evaluate the accuracy of the model. The low CV values obtained show the performance of the CIECAM02‐m2 model to predict the simultaneous contrast effect satisfactorily. © 2007 Wiley Periodicals, Inc. Col Res Appl, 32, 121 – 129, 2007     

工程建设项目管理信息系统的集成模式及实施策略

针对工程建设领域信息化实施的困境,分析了工程建设项目管理信息的特点,总结了三种信息系统集成的模式,提出了工程建设项目管理信息系统(MIS)的实施策略。     

引滦入唐工程某渡槽裂缝成因及对策分析

针对引滦入唐工程中某渡槽的开裂情况，从渡槽的两个使用状态入手进行分析，考虑按旧规范计算对设计造成的误差，采用大型有限元分析程序分析了渡槽各种工况的运行情况，并根据使用情况分析了开裂原因，提出了加固意见和同类渡槽设计的建议。     

悬浮泥沙反射光谱特性和泥沙量估算试验研究

通过实验室含沙水体的配比试验，对不同浓度含沙水体进行了光学特性测量，建立了不同悬沙含量遥感反演模型，结果表明：1）确立的水体光谱反射率和悬沙浓度之间的数值关系，为用卫星遥感技术探测表层悬沙浓度做了基础性的研究，取得了令人满意的效果；2）悬沙水样的敏感波段位于700nm～720nm，730～750nm和800～850nm；3）利用主成分分析方法结合多元线性回归可较为精确地估算悬沙含量，其模型反演能力明显优于敏感波段线性模型。对于浓度范围为0．1905g／L～3．6991g/L的悬沙水体，主成分回归模型反演精度更高，反演值和实测值的平均相对误差仅为5％左右；4）用实验室含沙水体配比方法进行的悬沙浓度与光谱关系的研究，其数据采集的同步性好，精度可靠。