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.     

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。     

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。     

农村劳动力转移模型:基于中国制度背景的构造

本文在对经典的农村劳动力流动模型进行理论梳理的基础上,引入中国的制度变量,试图构建适合中国制度背景的农村劳动力转移模型,同时,运用经验事实对其作进一步的实证检验,并分析了模型的政策含义。     

Research on Customer Satisfaction Strategy in China＇s Real Estate Industry

This paper analyzes real estate market condition, studies key influencing factors to customer satisfaction, and presents corresponding customer satisfaction model and effective strategy framework, which are of significance to achieve customer loyalty and get competitive edge for real estate enterprises.     

Intention of Internet-based Customer Involvement in Product Development： A Conceptual Investigation

The paper develops an extension of Technology Acceptance Model （TAM） and puts forward the TAM-VCE conceptual model to explain the intention of intemet-based customer involvement in new product development （NPD）. The findings will help enterprises design Virtual Customer Environments accepted by customer.     

电力商标分析及评估模型的构建

本文分析了电力商标的实质内涵，总结了电力商标的基本特征，在此基础上对商标的评估模型进行了创新构建，新建模型有两大特点：一是将商标收益分割为两部分计量；二是用强度系数进行了调整强化，为电力商标的评估提供一种新思路。     

对商誉的再探讨

商誉是无形资产中最为特殊的组成内容，过去人们封其性质和构成有不同的看法。在知识经济时代的今天，无形资产的性质和范畴认识得到深入，商誉的构成内容与无形资产的泉多组成内容有很多相同之处，商誉的实质就是多项未入账无形资产的总和。商誉的确认与计量问题也就转换为对企业自创无形资产的确认与计量，知识经济下应确认和计量对描述企业财务状况起关键作用的自创无形资产。但在不确定和充满风险的经济环境下，应积极稳妥地确认自创无形资产。自创无形资产的计量可按不同特点选择采用成本基础定价法、市场基础定价法、经济定价法。     

Snowpack response in the Assiniboine-Red River basin associated with projected global warming of 1.0 °C to 3.0 °C

This study assesses snow response in the Assiniboine-Red River basin, located in the Lake Winnipeg watershed, due to anthropogenic climate change. We use a process-based distributed snow model driven by an ensemble of eight statistically downscaled global climate models (GCMs) to project future changes under policy-relevant global mean temperature (GMT) increases of 1.0 °C to 3.0 °C above the pre-industrial period. Results indicate that basin scale seasonal warmings generally exceed the GMT increases, with greater warming in winter months. The majority of GCMs project wetter winters and springs, and drier summers, while autumn could become either drier or wetter. An analysis of snow water equivalent (SWE) responses under GMT changes reveal higher correlations of snow cover duration (SCD), snowmelt rate, maximum SWE (SWE_max) and timing of SWE_max with winter and spring temperatures compared to precipitation, implying that these variables are predominantly temperature controlled. Consequently, under the GMT increases from 1.0 °C to 3.0 °C, the basin will experience successively shorter SCD, slower snowmelt, smaller monthly SWE and SWE_max, earlier SWE_max, and a transition from snow-dominated to rain-snow hybrid regime. Further, while the winter precipitation increases for some GCMs compensate the temperature-driven changes in SWE, the increases for most GCMs occur as rainfall, thus limiting the positive contribution to snow storage. Overall, this study provides a detailed diagnosis of the snow regime changes under the policy-relevant GMT changes, and a basis for further investigations on water quantity and quality changes.     

300m级特高土石坝施工期心墙沉降监控模型研究

心墙沉降是两河口高土石坝的控制性安全监测项目,结合室内试验、监测、施工进度等资料,研究了心墙砾石土的沉降特性,建立了施工期沉降监控模型。研究表明:沉降变形的发展呈明显的阶段性,即沉降环埋设初期的快速沉降期、填筑进度平缓进行的匀速沉降期以及填筑高峰期的加速沉降期;以填筑因子与时效因子为组合的监控模型具有良好的解析力与拟合度,计算实例4个测点判定系数R 2在0.938~0.972;施工期沉降产生的主导因素是填土层上覆的外压荷载,就已填筑高程1/2~2/3区段而言,施工期沉降变形所占的填筑分量与时效分量分别约占95%与5%;监控模型具有良好的外延性,在近1个月外延区间中预测误差不超过9.04 mm,通过不断延长建模时序以修正模型参数,可提高预测精度进而指导施工。