科创中国

The existing research of process capability indices of multiple quality characteristics mainly focuses on nonconforming of process output, the concept development of univariate process capability indices, quality loss function and various comprehensive evaluation methods. The multivariate complexity increases the computation difficulty of multivariate process capability indices(MPCI), which makes them hard to be used in practice. In this paper, a new PCA-based MPCI approach is proposed to assess the production capability of the processes that involve multiple product quality characteristics. This approach first transforms the original quality variables into standardized normal variables. MPCI measures are then provided based on the Taam index. Moreover, the statistical properties of these MPCIs, such as confidence intervals and lower confidence bound, are given to let the practitioners understand the capability indices as random variables instead of deterministic variables. A real manufacturing data set and a synthetic data set are used to demonstrate the effectiveness of the proposed method. An implementation procedure is also provided for quality engineers to apply our MPCI approach in their manufacturing processes. The case studies demonstrate the effectiveness and feasibility of this new kind of MPCI, which is easier to be used in production practice. The proposed research provides a novel approach of MPCI calculation.

探究了Vectran长丝纱在剑杆小样机上试织平纹织物的主要工艺设计和上机织造情况.研究Vectran长丝纱的可织性,探索利用Vectran长丝纱开发新型产业用纺织品的途径.结果表明其可织性与芳纶类似,主要问题是其织造张力难以均匀控制,且易钩丝,应对长丝纱作前处理并合理控制织造工艺.

In order to find a parameter as the evaluation index that can capture the effect of the interaction between asphalt and aggregate, the rheological properties of asphalt mastics using two kinds of asphalts and four kinds of aggregates under different filler-asphalt ratios were measured by a dynamic shear rheometer (DSR). Moreover, four rheological parameters of K.Ziegel-B, Luis Ibrarra-A, complex shear modulus ΔG*and complex viscosity Δη* for evaluating the interaction ability were studied. Results indicate that all the four parameters can characterize the interaction ability of asphalt and aggregate correctly and feasibly. Through the comparison of sensitivities and physical meanings of the four parameters, K.Ziegel-B with high sensitivity and exact physical meaning is finally selected as the evaluation index for interaction ability of asphalt and aggregate.

通过对中关图书馆评估机构、统计工作及评估指标体系的介绍与比较研究,指出我国图书馆绩效评估存在的主要问题.运用案例分析方法,详细对比中关大学图书馆绩效评价体系,分析我国图工委图书馆绩效评估体系存在的不足,提出改进我国图书馆绩效评估的建议.

采用PFA材料所成型的油封在机床油管中起到密封和显示油液位置的作用,以解决机床油路部分漏油的问题.为确保油封质量合格,运用CAE软件Moldflow模拟了油封塑料熔体在模具模腔中的流动、保压、冷却过程,预测制品可能发生的翘曲、气穴、熔接痕等缺陷,据此对油封模具的结构和注塑工艺参数优化,并介绍外骨架油封批量生产的模具设计及工作过程,提高了一次试模的成功率,加快了模具开发进度,进而缩短产品开发周期,提高企业的配套能力和产品质量.

主要介绍了徐州香山物流流程设计优化问题,并具体对该企业仓储、运输现状进行分析,提出了具体的优化措施和方案.

在综合比较知识管理成熟度模型的基础上,充分借鉴诸多知识管理成熟度模型的特性,结合我国企业知识管理实践,提出企业知识管理成熟度整合模型,并深入剖析其逻辑结构、成熟等级、关键过程领域以及实施程序,为现代企业有效实施知识管理项目,提升知识管理能力和绩效提供借鉴和帮助.

搜索引擎是当今人们获取信息的入口,百度指数反映了关键词被搜索的次数,直接衡量着投资者的有限关注.本文实证检验了百度指数和创业板股票市场表现的相关性,在此基础上,验证了投资者有限关注能影响股票的市场交易活动.投资者的有限关注能给股票带来正向的价格压力,而这种压力会很快发生反转.本文还利用百度指数逐日可测的优点,研究发现非交易日的投资者关注将显著影响下一交易日股票集合竞价时的价格跳跃.

对档案利用服务质量的评价不能只停留于综合档案馆的自我评价,社会公众即档案利用者才是档案利用服务质量评价的主体力量.本文从利用者本位的视角出发,尝试提出了一种社会公众参与的档案利用服务质量评价的指标体系和评价量表,以期推动综合档案馆档案利用服务质量的规范化管理.

对外径为Ф10mm碳纤维复合材料管成型工艺及性能进行了研究.结果表明,采用热缩工艺成型的碳纤维复合材料管工艺简单、质量可靠,Ф10mm碳纤维复合材料管件弯曲刚度与不锈钢管相当,弯曲强度为不锈钢的3倍以上,质量仅为不锈钢的50%,尺寸精度满足设计要求.