Parenting as a Dynamic Process: A Test of the Resource Dilution Hypothesis

In this paper, we tested the resource dilution hypothesis, which posits that, because parenting resources are finite, the addition of a new sibling depletes parenting resources for other children in the household. We estimated growth curve models on the self‐reported parenting practices of mothers using four waves of data collected biennially between 1994 and 2000 on a nationally representative sample of 2,082 Canadian children aged 2 to 5 at initial interview and in continuously intact, two‐biological‐parent households. Results showed that when new children were added to the household, mothers exhibited declines in positive interaction, but increased their levels of consistent parenting. Taken together, these findings suggested that parenting resources were reallocated, rather than diluted, when family size increased.     

基于利益相关者分析的工商管理专业实践教学体系

运用利益相关者矩阵分析了工商管理专业实践教学中的利益相关者之间的关系；在理论层面和过程层面指出了不同利益相关者的影响力；设计了基于实践教学理念的工商管理专业实践教学体系。     

基于逆高斯分布的项目投资风险收益理论模型

项目投资经济效果评价指标的风险分析指的是如何依据各影响因素的概率分布来推求经济效果评价指标的概率分布.本文从理论上建立了基于逆高斯分布项目投资风险收益理论模型并给予精细的分析.这对提高项目投资经济的可靠性及风险分析理论具有重要意义.     

湛江市海洋经济总产值的预测模型

运用多元回归理论,根据1990~2004年的年度数据,构建了湛江市海洋产业的总产值的预测模型,并利用MATLAB数学软件求解了预测模型,有效和系统地分析与预测了湛江未来海洋经济的发展趋势.     

法定解释实践之优先性规则：一个比较分析

法定解释是否有一种优先性或优先性规则，学界对此纷争不一。经过对各国操作性解释实践的比较分析，可以认为基本上不存在一种普遍性的优先性规则。即便是实际存在的以及理论建构的优先性规则，也是一种程序性的优先性规则，而非有关重要程度的优先性规则。     

Estimating Contaminant Dose for Intermittent Dermal Contact: Model Development, Testing, and Application

Assessments of aggregate exposure to pesticides and other surface contamination in residential environments are often driven by assumptions about dermal contacts. Accurately predicting cumulative doses from realistic skin contact scenarios requires characterization of exposure scenarios, skin surface loading and unloading rates, and contaminant movement through the epidermis. In this article we (1) develop and test a finite-difference model of contaminant transport through the epidermis; (2) develop archetypal exposure scenarios based on behavioral data to estimate characteristic loading and unloading rates; and (3) quantify 24-hour accumulation below the epidermis by applying a Monte Carlo simulation of these archetypal exposure scenarios. The numerical model, called Transient Transport through the epiDERMis (TTDERM), allows us to account for variable exposure times and time between exposures, temporal and spatial variations in skin and compound properties, and uncertainty in model parameters. Using TTDERM we investigate the use of a macro-activity parameter (cumulative contact time) for predicting daily (24-hour) integrated uptake of pesticides during complex exposure scenarios. For characteristic child behaviors and hand loading and unloading rates, we find that a power law represents the relationship between cumulative contact time and cumulative mass transport through the skin. With almost no loss of reliability, this simple relationship can be used in place of the more complex micro-activity simulations that require activity data on one- to five-minute intervals. The methods developed in this study can be used to guide dermal exposure model refinements and exposure measurement study design.     

用椭偏仪同时测定主应力差和方向

本文叙述了用衡消型(NE)、旋转检偏器型(RAE)和偏振调制型(PME)椭偏仪均能同时测定光弹性试件的主应力差和方向两个量的原理,并推导了有关的计算公式。     

医学图像分析技术及其应用的研究

信息图像化是一个受到广泛重视的研究课题,而图像的定量分析关系到图像中所包含的信息能否被很好的提取和利用.本文介绍了图像分析技术的原理及过程,着重介绍了自行研制的图像分析仪的应用实例.     

三维打印成形粉末的均匀试验设计研究

利用带限制的混料均匀方法对三维打印成形的粉末配方进行试验设计.对试验数据进行多元非线性回归分析,验证了石膏基粉末中各个成分对三维打印成形制件的影响规律.结果表明,粉末中石膏含量是影响制件密度的关键因素,而聚乙烯醇则可以显著提高制件的表面质量,减小尺寸变形量,白碳黑和聚乙烯醇的交互作用对制件密度和尺寸变形量也有一定的影响.     

基于博弈分析的企业诚信研究

在企业诚信的概念与内涵的基础上,探讨了企业诚信相关的收益与成本,由此奠定了企业诚信博弈分析的基础。在企业诚信博弈分析的过程中,建立了相关博弈模型,解决了不同类型企业的诚信博弈问题,提出了纯策略和混合策略均衡下的诚信经营条件,并作了相关讨论。最后,在博弈分析的基础上,提出了促进企业诚信化经营的相关建议。