广告直投杂志发展的现状、问题与对策

从我国直投杂志的发展现状来看,一些内部因素和外部因素制约了它的有序发展。直投杂志要深入细分读者(广告诉求对象)市场,要选择多种方式综合直投,形成杂志品牌,提升广告效应,做好杂志内容及外包装。     

基于Java数据压缩技术的分布式数据库系统的构造与实现

在Java语言环境下，使用RMI的对象激活技术实现了多层分布式数据库系统。采用Java数据压缩技术．对用户检索的数据库数据进行压缩，从而减少网络传输的数据量，减轻网络负担。     

微型冷热电联产系统动力装置的参数优化

建立了内燃机的通用数学模型,提出了内燃机的运行经济区.得出了改装后的LJ276M型内燃机的数学模型,并界定了此内燃机的运行经济区的边界范围,分析了此内燃机的运行优化曲线和最佳运行工况点.针对动力系统的冷热电、热电和供电3种操作模式,分别建立了能量转换数学模型,优化了动力装置的内燃机/变速箱传送比ies、电动机/变速箱传送比ims和电动机/内燃机传送比ime.结果表明：在冷热电模式下,ies和ims的优化值分别为2.9和1;在热电模式下,当动力系统需求负荷小于内燃机运行经济区的下限值时,ime取1,而当动力系统需求负荷超过内燃机运行经济区的下限值时,ime取0.85;在供电模式下,ims的最优值取2.5.     

基于分布式的煤矿井下温度调节算法研究

为了解决煤矿井下温度控制的应用需求,提出了一种采用分布式的煤矿井下温度调节算法.该算法通过分布在矿井下不同位置的温度传感器探测矿井下的温度,采用模糊神经网络的策略对井下的温度进行调节和控制.给出模糊神经网络的隶属度函数以及模糊函数,仿真测试表明,所设计的温度控制算法具有较强的鲁棒性.     

Effect Analysis Using Nonlinear Structural Equation Mixture Modeling

In this article, we present an approach for comprehensive analysis of the effectiveness of interventions based on nonlinear structural equation mixture models (NSEMM). We provide definitions of average and conditional effects and show how they can be computed. We extend the traditional moderated regression approach to include latent continous and discrete (mixture) variables as well as their higher order interactions, quadratic or more general nonlinear relationships. This new approach can be considered a combination of the recently proposed EffectLiteR approach and the NSEMM approach. A key advantage of this synthesis is that it gives applied researchers the opportunity to gain greater insight into the effectiveness of the intervention. For example, it makes it possible to consider structural equation models for situations where the treatment is noneffective for extreme values of a latent covariate but is effective for medium values, as we illustrate using an example from the educational sciences.     

WPT-based modal control on distributed structures with MRF-04K damper

The magnetorheological (MR) fluid damper-based semiactive control systems have received considerable attention for protecting structures against natural hazards such as strong earthquakes and high winds. In this paper, a novel modal controller using wavelet packet transform (WPT) is proposed for the vibration control of distributed structures. In the proposed control system, the WPT method is utilized to decompose the acceleration measurement and select the modes containing most of the WPT energy component as the dominant modes. Then, a modal controller is designed to control the dominant modes and the optimal active control force is solved. Finally, Clipped-optimal con- trol law is adopted to determine the voltage applied to each MR damper. A Kalman-filter observer, which estimates the full controlled modal states from local accelerometer feedbacks, is designed for rendering the controller to be more applicable to distributed structures with a large number of degrees of freedom. A numerical example of a stadium roof structure installed with MRF-04K damper is presented. The effectiveness of the controller is evaluated under both Tianjin and El Centro earthquake excitations. The superior performance and adaptability of the controller for versatile loading conditions are demonstrated through the comparison with traditional truncated modal controller.     

新一代计算机网络技术-网格计算

网格计算是将一个网络中众多计算机资源在同一时间用于单个问题的处理,通常用于需要极大量计算机处理周期或访问大量数据的科学或技术问题.     

On personal and collective dimensions of agency in doctoral training: medicine and natural science programs

The purpose of the present study was to investigate knowledge-creating agency by examining doctoral students' accounts of their pursuits, using structured interviews. We examined all of the talk apparently related to agency of 13 doctoral students taking part in collective doctoral training in two, highly regarded Finnish research communities (natural science and medicine). The doctoral process involved the participants pursuing article-based theses based on collectively shared research problems and journal articles co-authored with the supervisor and other senior researchers. Based on the qualitative analysis of the interviews, three categories of agentic talk were identified, respectively, for three proposed types of knowledge-creating agency: personal, distributed, and ‘object-related’. Personal agency involved participants' reflection on their academic competence, self-efficacy, and personal strengths and weaknesses. Distributed agency played an important role in assisting these participants overcoming challenges; this includes sharing of expertise, receiving social support, and having a sense of collective efficacy. Object-related agency, in turn, represented integration of a doctoral student's efforts with those of her immediate research community while pursuing shared research objects (e.g., co-authored articles). Apart from issues of agency which, the authors propose, are raised in the interviews, the data provide content-rich accounts of the collective nature of doctoral experiences.     

晶体管单管放大电路实验中出现的问题及改进措施

在模拟电子技术的共射极单管放大电路实验中,出现与理论不相符的现象,在输入为正弦交流信号的情况下,输出端却观察不到同频率的放大的正弦交流信号,取而代之的是一调幅信号.通过对实验系统的观察分析,发现出现这种现象是因为实验板的较宽的铜箔导线之间存在分布电容.由此确定实验系统的改进措施,即在三极管的基极和射极之间加一电容,最终问题得以解决.     

分布式创新网络知识协同风险评价研究

在已有的创新网络知识协同风险研究的基础上,构建分布式创新网络知识协同风险评价模型。采用模糊层次分析法对风险因素的重要度进行层次总排序并找出关键风险因素,然后结合模糊综合评价法确定风险发生的概率大小和风险发生可能带来损失的多少,最后以实例证明该方法的实用性与科学性。