北京CBD产业集群效应

现代商务中心区 (CBD)对于城市、区域经济发展的重要作用在于其产业集群效应的充分发挥。本文通过实地调研 ,对北京CBD的产业集群现状及其效应、机制进行了深入分析 ,认为 ,北京CBD最基本的特征是现代高端服务业的集群 ,北京CBD的产业集群具有混合产业区的特征 ;目前北京CBD的产业集群的发展存在脆弱性 ,即 :虽已形成较明显的产业集聚的特征 ,但产业集群的机制还不健全、产业集群效应具有很大的局限性。文章对这些问题的成因及对策进行了分析     

The SESS multisite collaborative research initiative: establishing common ground

Multidisciplinary intervention approaches are needed for meeting service needs for families in which substance abuse and mental health disorders may be interfering with child‐rearing. Experiences from the Starting Early Starting Smart (SESS) initiative, a 12‐site national collaborative investigation of integrating behavioural health services in early childhood and primary health care service settings for children aged 0–5 years and their families and caregivers, are described. This 4‐year applied research initiative was co‐funded by the Substance Abuse and Mental Health Services Administration of the US Department of Health and Human Services and Casey Family Programs, a private operating foundation. SESS, which was developed and implemented in 12 geographically and culturally diverse cities in the USA during 1997–2001, encouraged federal, state, and local public/private partnerships. Opportunities and challenges in using an inclusive, consensus‐based, stakeholder model to maximize study relevance and utility for researchers, practitioners, and fiscal sponsors are discussed, and lessons for multidisciplinary, multisite research collaborations are identified.     

体验与成长：大学学业评价的一种理念——以教育研究方法课程为例

大学作业的评价是大学教学不可缺少的环节,以怎样的理念作为大学作业评价的追求关系到学生的成长与发展.“教育研究方法”课程是师范类专业的必修课,依据此课程的特点,它的评价方式应该充分贯彻“体验与成长”的理念,通过体验促进学生的专业成长.     

Qdf misclassification probabilities for known population parameters

Approximated QDF misclassification probabilities have been derived for bivariate normal populations with known parameter values. Tne effect of unequal covariances and population distance on the misclassification probabilities are examined     

从身心关系看“虚构的悖论”

“虚构的悖论”是当代美学争论的焦点之一.为了解决审美经验中真实情感与艺术虚构之间的不协调性,一些美学家主张审美经验中的情感反应是假装的,另一些美学家则主张艺术虚构具有想象性的真实.本文试图用身心关系理论来解决“虚构的悖论”,并在此基础上提出艺术功能的猜想,即艺术的目的就是维持身心之间的协调与合作关系.     

Policymakers' Use of Social Science Research: Looking Within and Across Policy Actors

Evidence‐informed policy creates the conditions for families to perform the functions they provide for their members and society. To increase research utilization in policymaking, we must better understand policymakers and the professional and institutional cultures in which they operate. This exploratory cluster analysis examined within‐group differences in valuing, seeking, and use of social science research among 68 legislative staffers and 56 high‐ranking officials from 8 family‐serving executive agencies in Wisconsin. The findings are compared with a parallel study of 109 legislators from New York and Wisconsin. Among all 3 policy actors, a substantial proportion highly value research, actively seek it, and frequently use it in policy decisions; these Enthusiastic High Users of research are more attuned to political considerations compared to other clusters. Enthusiastic High Users in the legislative institution place a higher priority on innovative and action‐oriented research, whereas those in the agency institution prioritize the quality of research.     

基于可拓理论的粮食物流中心选址研究

综合运用可拓决策方法、聚类分析、重心法，建立了基于可拓理论的粮食物流中心选址模型。将选址过程中的矛盾问题转换为相容问题进行研究，使选址结果更为合理。以山东省为例论证了模型求解方法的可行性。该模型还可应用到其它省乃至全国来进行粮食物流中心的选址决策，在实际应用中具备可操作性。     

基于组合漂移模型的订单流变化条件下汇率波动研究

通常,宏观名义汇率模型的预测效果很不理想,其R2统计量最高10%左右.针对这一现象,本文对汇率决定基础模型中的一个考虑微观因素的新模型做了实证分析,结果表明,组合漂移模型成功地解释了汇率变动,R2统计量超过了60%.在样本外预测中,本模型预测效果也明显优于随机游走模型.同样,本文估计即期汇率与订单流的敏感程度是相似的.这个结果将引导作者在研究过程中同时引入微观和宏观方法,而这种方式将可以更广泛地应用于资产定价方面的研究.     

基于加权模糊c均值聚类的快速图像自动分割算法

图像分割是指将一幅图像分解为若干互不交迭的区域的集合，是图像处理和计算机视觉的基本问题之一。为了提高图像分割的效率，提出了一种基于2维直方图加权的塔形模糊c均值（FCM）聚类图像快速分割算法。该方法先通过构造合理的2维直方图对噪声进行抑制；然后通过塔形分解来缩减聚类样本集；最后利用加权FCM聚类算法进行分类。仿真结果表明，该方法的效率明显优于标准的FCM算法。此外，为确定分割的最优类别数c，还引入了一种基于该快速算法的聚类有效性评价函数——修正划分模糊度，实现了最佳图像分割类别数c的自动确定。基于人造图像和实际图像的测试实验结果表明该方法是有效的。     

金属簇合物的发展概况与研究趋势

本文对金属簇合物的研究进展作了概述，着重介绍了几种近几年合成的具有新结构形式和新成键方式的铁和钴等羰基簇合物，探讨了金属簇合物的研究趋势。