老化沥青混合料粘弹性疲劳损伤模型研究

为了较真实反映沥青路面服务期的疲劳损伤特性,从粘弹性材料的基本特性出发,通过本构方程和耗散能的定义构造了耗散能的泛函,定义耗散能为损伤变量,建立基于Burgers模型的老化沥青混合料粘弹性疲劳损伤模型,通过直接拉伸试验确定沥青混合料的粘弹性参数,求出损伤函数、损伤演化方程,提出一种考虑疲劳过程中老化程度对疲劳损伤影响的累积疲劳损伤计算理论与方法,为沥青混合料在不同老化程度下的疲劳寿命预估提供了依据。根据疲劳损伤模型推导出沥青混合料临界损伤度、疲劳寿命计算公式,并对其进行计算比较,精度满足要求,从而验证了粘弹性疲劳损伤模型的合理性。     

谐波污染测试及治理实例

以宿迁经济开发区出现的一则谐波源用户污染电网的事件为例,介绍了谐波现场测试标准和允许值,以及测试结果.给出谐波污染的治理方案以及方案实施的效果.谐波抑制的效果较为满意。     

无源光网络的初步升级方案

利用 13 10nm/ 15 5 0nm粗波分复用器 (CWDM)与 15 5 0nm光纤型带内耦合器 (OFIBC) ,提出了无源光网络(PON)的初步升级方案 ,CWDM与OFIBC复用器大的通带间隔与温度不敏感性保证了可以采用现行的无制冷的F P腔激光器 ,实验表明根据OFIBC的通带 ,选择激光器中心波长 ,系统可以达到具有较小的功率损耗与串扰。     

Preventing problems with boys' noncompliance: Effects of a parent training intervention for divorcing mothers.

This study provided a randomized, experimental test of the efficacy of a parent training intervention on coercive discipline, positive parenting practices, and child noncompliance in a sample of 238 divorcing mothers and their sons in Grades 1–3. Intervention effects were evaluated 5 times from baseline to 30 months. The intervention produced enduring benefits to coercive discipline, positive parenting, and boys' noncompliance. These benefits followed a classic prevention effect: Mothers and sons in the experimental group maintained stable outcome trajectories, whereas those in the control group deteriorated. The intervention's impact on boys' noncompliance was mediated independently by its impact on coercive discipline and positive parenting. Change in positive parenting was more strongly associated with change in noncompliance than was change in coercive discipline, although each explained unique variance in change in noncompliance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Concluding causation from correlation: Comment on Burns and Spangler (2000).

This commentary critiques the study conducted by D. D. Burns and D. Spangler (2000) (see record 2000-13544-005) in which the relationship between homework compliance and therapy outcome was estimated using structural equation modeling (SEM). Although the authors, of the commentary advocate the use of SEM, they suggest greater caution in the indiscriminate endorsement of a causal relationship based on (a) correlational data and (b) retrospective accounts of the main predictor variable within a cross-sectional design. This discussion also highlights a need to address the issue of therapist competence in homework administration. The results of Burns and Spangler's report are consistent with existing empirical evidence suggesting that compliance with homework facilitates therapeutic outcome. However, the gold standard for determining causal inferences rests on prospective, experimental research rather than on retrospective, correlational models. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

非合作照射目标探测技术中匹配滤波法的分析与仿真

利用非合作照射(如调频广播、电视发射信号)的无源雷达探测技术一直是令人感兴趣的话题.国内外的相关报道和文献资料对其均有所介绍.在目标的检测方法上,人们也提出了许多方法.其中,大多数方法都是以匹配滤波器为基础的.本文对匹配滤波器在该类系统中的运用进行了理论分析,并通过计算机仿真进行了验证.     

基于人工智能方法的无源光网络优化规划

使用人工智能方法对PON网络拓扑结构进行优化,以富士通FPX－1000无源光网络系统为例进行了仿真实验,并对遗传算法,增添算法和Hopfield网络方法进行比较,仿真结果表明遗传算法明显优于增添算法和Hopfield网络方法,遗传算法可使网络建设代价最小化,它非常好地解决了PON规划问题。     

双子阵被动跟踪系统

文章介绍一种用于水下机动目标测量的双子阵被动跟踪系统,介绍了双子阵定位原理和系统构成,提出了广义相关时延估计方法、时延值滤波方法和卡尔曼弹道滤波器,该系统能方便地进行水面或水下机动目标的跟踪测量。     

水墨元素在包装设计中的应用探析

目的 探索包装设计中的水墨艺术化融入。方法 在各种文化相互碰撞、艺术设计无处不在的社会现实中,水墨艺术不断吸收借鉴其他艺术形式的精髓,与各个艺术门类产生了紧密的联系。深入分析水墨艺术形式的外在特点与深刻内涵,从真、简、灵等视角探索水墨艺术的独特之处,得出水墨在包装设计中的融入与延伸是可行的,符合消费者和时代的双重要求,结合水墨的图形、文字、审美意境进行方向性的探讨,分别选取包装设计中的突出代表领域进行全面、详细的审视与分析。结论 水墨文化中的视觉元素与气韵之美都是当前包装设计中的灵感来源,其或浓或淡、或深或浅的变化,以及动静皆宜、宁静悠远的意境,让包装设计作品具备了更大的艺术魅力和经济价值,实现了更加长远的发展。