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排序方式: 共有247条查询结果,搜索用时 15 毫秒
1.
杨文举 《中国教育研究与创新》2006,3(1):16-17
有着学业水平差异的学生称作“异质学生”,异质学生的数学教学首先要使学生尽可能大地形成共性基础,应该让学生能得到最优化的发展。在新课标的指导下,数学教师在实施人文教育的同时,要针对异质学生的不同特点,在班级授课中形成独特的教材,这一教材应该是课本的同构体或异构体。教师要倡导自主学习,要发展地评价学生。 相似文献
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PU Jun-ping ZHENG Jian-jun 《浙江大学学报(A卷英文版)》2006,7(11):1831-1838
INTRODUCTION The differential quadrature method (DQM) was proposed by Bellman and Casti as an analogous ex- tension of the quadrature method for integrals (Bellman and Casti, 1971; Bellman et al., 1972). It can be essentially expressed as the values of the de- rivatives at each grid point as weighted linear sums approximately of the function values at all grid points within the domain under consideration. As a distinct numerical solution technique to obtain the initial and/or boundary … 相似文献
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利用H(o)lder不等式得到了微分形式的局部 Ar (λ1,λ2 ;Ω)-加权Poincaré型不等式,所得结果能被广泛应用于某些重要方程解的高阶可积性理论. 相似文献
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电机运行时会产生各种电磁和共模干扰,影响电机参数的准确获取。传统的电机参数检测方法不能充分滤除现场出现的各种干扰信号,从而增大测量误差,影响测量参数的准确性。为此,本文设计了一种实用的干扰抑制技术,大大提高了测量参数的准确性和精确性。最后通过GSM/GPRS无线网络数字传输技术,将下位机采集到的电机参数发送给上位机中心专家诊断端系统,进行在线实时故障诊断和排除。 相似文献
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吴冰洁 《信阳师范学院学报(哲学社会科学版)》2011,31(2):23-27
作为传统社会关系结构的差序格局,发展到现代社会已经发生了很大的变化,集中体现在:以伦理为基础的差序格局纳入情感、理性因素,差序格局的范围在扩大,差序格局呈现横向和纵向的立体结构,"城市版"的差序格局以及具有时-空意识的"差序场"。自利益进入差序格局后,人际关系的等级原则在逐渐弱化,理性化的人际关系正在淡化中国的社会关系结构,出现了"工具性差序格局"、"紧缩圈层"、"内核-外围"、"逆差序格局"等理性化的社会关系结构。现代中国社会人际关系的发展虽注入了现代的因素,但依然以传统伦理为根基,并非完全理性选择的结果。 相似文献
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利用Leray-Schauder度理论,证明了Caputo和Remann-Liouville分数阶微分方程初值问题解的存在性。 相似文献
9.
Families with complex needs related to domestic violence, mental health, and substance use have some of the worst child protective services (CPS) outcomes. Although many of these families are identified during a CPS investigation and subsequently referred to home-based postinvestigation services (HBPS), many are re-reported to CPS, so it is important to understand the postinvestigation experiences of this vulnerable group. Therefore, this study compared families with and without complex needs to understand their uniquedemographics, needs, and postinvestigation outcomes.The sample consisted of 2008 caregivers who received HBPS following an initial CPS investigation. The Family Assessment Form (FAF) was used to measure family functioning in eight domains using a 1–5 scale with higher ratings representing worse functioning. Complex needs were indicated by a mean FAF score of 3 or higher for either domestic violence, mental health, or substance use. Using Pearson chi-square analyses and two-sample t-tests, comparisons were made between families with (n = 836) and without (n = 1172) complex needs. Half of caregivers with complex needs had a history of abuse, 25% had three to five needs, and nearly half had six to eight needs; 90% of caregivers without complex needs had zero to two needs. Furthermore, caregivers with complex needs had higher mean scores for concrete, educational, and clinical needs. These findings highlight the importance of recognizing variation among families referred to HBPS and accurate screening to ensure that families with complex needs are offered and receive services matched to their unique characteristics and needs. 相似文献
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This paper is concerned with the problem of global asymptotical tracking of single-input single-output (SISO) nonlinear time-delay control systems. Based on the input-output feedback linearization technique and Lyapunov method for nonlinear state feedback synthesis, a robust globally asymptotical output tracking controller design methodology for a broad class of nonlinear time-delay control systems is developed. The underlying theoretical approaches are the differential geometry approach and the composite Lyapunov approach. One utilizes the parameterized co-ordinate transformation to transform the original nonlinear system into singularly perturbed model and the composite Lyapunov approach is then applied for output tracking. For the view of practical application, the proposed control methodology has been successfully applied to the famous nonlinear automobile idle-speed control system. 相似文献