相变潜热对ф160mm GCr15轴承钢棒材控冷工艺的影响

利用MSC.Marc软件,对直径ф160mm GCr15轴承钢喷水冷却过程的温度场进行模拟分析。利用编写的ufilm和flux子程序,将相变潜热以内热源的方式添加到温度场。通过分析棒材在不同相变潜热取值下沿径向的温度变化情况,理论探讨了相变潜热对控冷工艺的影响。结果表明:相变潜热显著减缓了棒材的冷却速度,且越接近棒材芯部相变潜热引起的温升越大。考虑相变潜热时,原来的控冷方案不满足工艺要求。因此,在模拟研究控冷时,就本文理论探讨的GCr15轴承钢棒材的控冷工艺来看,相变潜热不应忽略。     

基于LDA主题模型的移动应用相似度构建方法

随着移动互联网的快速发展,如何从大量的移动应用中抽取有效的描述信息继而为移动用户提供有效准确的推荐策略变得尤为迫切。目前,移动应用市场对应用的推荐策略相对传统,大多是根据应用的单一属性进行推荐,如下载量、应用名称、应用分类等。针对推荐粒度过粗和推荐不准确的问题,提出了一种基于潜在狄利克雷分布（LDA）主题模型的移动应用相似度构建方法。该方法从应用的标签入手,构造应用的主题模型分布矩阵,利用该主题分布矩阵构建移动应用的相似度矩阵,同时提出了将移动应用相似度矩阵转化为可行的存储结构的方法。实验结果表明该方法是有效的,相比现有的360应用市场推荐的应用其相似度提升130%。该方法解决了移动应用推荐过程中推荐粒度过粗的问题,可使推荐结果更加准确。     

芯体机能材料对静止式全热交换器性能的影响

静止式全热交换器的关键构件是换热芯体,换热芯体中的机能材料要求其具有良好的传热、透湿性能,一般采用经过特殊处理的纸材或膜结构,这些材料的性能又是全热交换器实现热湿交换的关键。从理论上分析了机能材料交换膜厚度和质扩散系数对静止式全热交换器性能的影响,对国内外开发的15种芯体机能材料进行了性能试验,并对其中的6种材料制成的芯体所具有的热湿交换性能和有效换气率进行了测试对比。结果表明,交换膜的厚度和材料的透湿性对芯体潜热效率的影响显著,而材料的透气度将直接影响到芯体的有效换气率。     

A dimensional analysis of creativity and mental illness: Do anxiety and depression symptoms predict creative cognition, creative accomplishments, and creative self-concepts?

The link, if any, between creativity and mental illness is one of the most controversial topics in modern creativity research. The present research assessed the relationships between anxiety and depression symptom dimensions and several facets of creativity: divergent thinking, creative self-concepts, everyday creative behaviors, and creative accomplishments. Latent variable models estimated effect sizes and their confidence intervals. Overall, measures of anxiety, depression, and social anxiety predicted little variance in creativity. Few models explained more than 3% of the variance, and the effect sizes were small and inconsistent in direction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于PLSA模型的Web用户会话聚类

发现Web用户的访问模式是Web日志挖掘的重要任务之一。传统的Web用户会话聚类方法对解空间的搜索带有盲目性且缺乏语义特征,本文提出了一切向钱看种基于概率潜在语义分析的用户会话聚类方法,它采用了用户会话—潜在语义—页面之间的概率关系进行用户会话聚类,以便发现用户访问模式。实验结果表明该方法与k-means方法相比更具高效性。     

游泳馆空调的热湿负荷计算与节能

总结了室内恒温泳池项目的热湿计算公式,简化了泳池区蒸发量的计算公式;同时通过对不同地区热湿计算的比较,指出了室内恒温泳池类项目的节能要点和计算方法。     

潜伏性环氧树脂/胺基酰亚胺体系的固化动力学

分别采用Kamal模型和Kissinger模型研究了E-51/胺基酰亚胺潜伏性固化体系的等温和非等温固化动力学,讨论了该体系的固化反应机理。结果表明,由这两种动力学模型得到的固化动力学参数基本相近,E-51/胺基酰亚胺体系固化反应起始阶段的活化能较高,约为124 kJ/mol～131 kJ/mol。该体系的固化反应包含n级反应和自催化反应。胺基酰亚胺热分解反应是E-51/胺基酰亚胺体系固化反应的控制步骤。     

Five-factor trait instability in borderline relative to other personality disorders.

Borderline personality disorder (BPD) is related to five-factor model (FFM) traits and can be characterized as involving psychological and behavioral instability. A previous study comparing the FFM trait stability across individuals with borderline and other personality disorders found that the BPD group tended to have lower stability, particularly on neuroticism and conscientiousness and the overall configuration of FFM profiles over 6 years, suggesting that associated psychological and behavioral variability may be due to trait variability. The current study was designed to test the degree to which these findings replicate in another sample using different diagnostic and trait measures and extending the measurement period to 10 years. Results are consistent with previous findings in showing lower differential (rank-order) stability on conscientiousness, greater mean-level decreases on neuroticism, lower individual-level stability on conscientiousness, and lower ipsative stability of trait profile configurations among those with BPD. However, unlike the previous study, no differences were observed for differential or individual-level neuroticism or mean-level conscientiousness. Overall, findings show that the instability characteristic of BPD extends into typically stable personality traits, and that it does so with some specificity in terms of which traits are affected and how instability manifests. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于DF与LSA相结合的降维法的文本分类系统的研究

介绍了中文文本分类系统的原理,在特征提取上采用了文档频率法（DF）与潜在语义分析法（K认）相结合的方法,先采用DF法过滤掉DF值低的词条,降低文本矩阵的稀疏性,然后使用LSA法进行词语间的语义分析,消除同义词和多义词的影响,提高文本分类的速度与精确度。实验结果表明使用此种降维方法取得了良好的效果。     

Study of the optical transmission enhancement properties in a one-dimensional Ag film with different single slit groove structures

Numerical simulation has been performed on the optical transmission enhancement properties of a one-dimensional Ag film single slit structure with grooves. The results show that the position, depth and number of the grooves have great influence on the optical transmission, and surface plasmon polariton and resonance mode are the primary factors. The maximal extinction ratio of 35.8 dB is achieved in the single slit structure by adjusting groove depth.