Mother Emotion,Child Temperament,and Young Children's Helpless Responses to Failure

Young children differ in their responses to failure, displaying mastery or helpless behavior patterns. We examine the moderating role of child temperament on the association between parent warmth/negativity and children's helpless responses to failure. Regarding temperament, we focus on tendencies to experience interest and sadness because they entail task engagement and withdrawal, respectively. We measured mother (n=150) expressions of positive and negative emotion during a teaching task, assessed temperament using LabTAB‐Preschool episodes, and coded helplessness during an impossible puzzle task. Maternal negative emotion during teaching was positively associated with helplessness, but only for children low in interest. Maternal warmth was negatively associated with helplessness, but only for children high in sadness; sadness did not moderate the relation between maternal negativity and helplessness. Findings provide support for parenting by temperament goodness‐of‐fit models and for a discrete emotions approach to temperament.     

基于有限体积法的离散裂缝模型两相流动模拟

正确认识裂缝性油藏流体流动规律是其高效开发的基础，离散裂缝模型因其对裂缝予以显式降维处理，能够大大提高计算效率而逐渐成为当前研究的热点。有限体积法在控制体单元上具有明确的物理意义，能够严格保证局部质量守恒，适用于流场性质不连续的情况。基于Delaunay 三角网的对偶网格构建有限体积控制单元，推导了离散裂缝模型油水两相流动控制方程的有限体积数值计算格式，实现了离散裂缝模型油水两相数值模拟，通过算例验证了该方法的正确性与高效性。研究表明：该方法能够严格保证局部质量守恒，计算过程中收敛性较好，适用于离散裂缝油藏的数值模拟，与单孔隙介质模型计算结果具有很好的一致性，计算效率提高2.5∼3.0 倍。     

Minimum Contrast Estimation for Fractional Diffusions

Abstract.  When the Hurst coefficient of a fractional Brownian motion     is greater than 1/2 it is possible to define a stochastic integral with respect to     , as the pathwise limit of Riemann sums, and thus to consider pathwise solutions to fractional diffusion equations. In this paper, we consider the vanishing drift case and assume that the solution X _t is parameterized by θ in a compact parameter space Θ . Our main interest is the estimation of θ based on discrete time, but with very frequent observations. It is shown that the estimation problem in this context is locally asymptotically mixed normal. The asymptotic behaviour of a certain class of minimum contrast estimators is then studied and asymptotic efficiency is discussed.     

发电机端部振动光纤传感测试方法的研究

在理论上建立了光纤加速度传感器的工作模型,推导出了光纤传感器输出光信号受到振动调制的解析表达式,并分析了光纤传感器的输出幅频特性及输出信号与振动加速度之间的线性关系。文中还提出了一种新型的以光纤加速度传感器为基础构成的光纤振动测试系统设计方案,研究成功的光纤振动测试系统成功地应用于上海电机厂125MW和30MW大型汽轮发电机定子绕组瑞部振动测试真机试验,获得了满意的结果。     

熔锥光纤定向耦合理论

提出了一种分析熔锥光纤定向耦合器及其衍生器件的新数理模型。通过把基模场的高斯理论发展到双包层光纤,并采用正态分布函数来描述耦合区的几何形态,较为完善清晰地反映了模场及边界的渐变特性。导出了本地标量场耦合系数的简洁解析式及其矢量修正式。具体器件的理论计算与实验相符较好。     

光纤探针式轮廓仪的理论与实验研究

在单根单模光纤作为发射光纤兼接收光纤的情况下,提出了光纤探针式轮廓仪,得到一个光纤探针来测量被测表面的微观轮廓曲线,并由轮廓曲线得到了表面粗糙度的各种参数和光纤探针的形状和尺寸。同时阐述了利用光纤探针测量表面轮廓和粗糙度的原理及光纤探针式轮廓仪的构成和工作原理,给出了测量结果。     

小信号反馈放大器的无环信号流图分析法

本文揭示了一种避免解联立方程组而直接分析小信号反馈放大器的方法,即用传输矩阵对双端口网络进行分析.这样一来,一个小信号反馈放大器就可用不含反馈环的级联信号流图表示,以得到一些具体结果.     

高速旋转体温度分布光纤传感测试方法的研究

本文从理论、实验上分析了半导体 GaAs 本征单晶片透过光强与温度的关系特性.提出了一种新型的高速旋转体温度分布光纤传感测试方法,根据其测试原理研制成功的样机测试系统在龙羊峡水电站32万瓩水轮发电机上进行真机试验.取得了较为满意的结果.     

扩招后实施素质教育的探索

在高校扩招后,我们应当对新生的质量有个正确的认识,积极转变观念,改进教学方法,推进素质教育。     

函数严格单调充要条件的改进

对文献［２］中函数严格单调的“充要条件”给出了反例;给出并证明了两个新充要条件．