科创中国

主要论述了在以积件为主体的《仓储实务》课程数字资源建设中,把握先进教学理念,梳理并重构学科内容,精心划分知识点,为制作积件打好基础.提出应充分考虑《仓储实务》的教学模式改革,将情境、任务等设计成为单独的知识点,明确学科内容,确定知识点积件类型,以及如何处理知识点划分中遇到的大小、名称及数量等问题.

As one of the most wear monitoring indicator, dimensional feature of individual particles has been studied mostly focusing on off-line analytical ferrograph. Recent development in on-line wear monitoring with wear debris images shows that merely wear debris concentration has been extracted from on-line ferrograph images. It remains a bottleneck of obtaining the dimension of on-line particles due to the low resolution, high contamination and particle's chain pattern of an on-line image sample. In this work, statistical dimension of wear debris in on-line ferrograph images is investigated. A two-step procedure is proposed as follows. First, an on-line ferrograph image is decomposed into four component images with different frequencies. By doing this, the size of each component image is reduced by one fourth, which will increase the efficiency of subsequent processing. The low-frequency image is used for extracting the area of wear debris, and the high-frequency image is adopted for extracting contour. Second, a statistical equivalent circle dimension is constructed by equaling the overall wear debris in the image into equivalent circles referring to the extracted total area and premeter of overall wear debris. The equivalent circle dimension, reflecting the statistical dimension of larger wear debris in an on-line image, is verified by manual measurement. Consequently, two preliminary applications are carried out in gasoline engine bench tests of durability and running-in. Evidently, the equivalent circle dimension, together with the previously developed concentration index, index of particle coverage area(IPCA), show good performances in characterizing engine wear conditions. The proposed dimensional indicator provides a new statistical feature of on-line wear particles for on-line wear monitoring. The new dimensional feature conveys profound information about wear severity.

The strain distributions near the interface when the elbow steel fiber is pulled out from the half-mould concrete matrix are directly measured using a combined method of single fiber pull-out test and digital image correlation. Meanwhile, the real-time processes of the bonding, debonding and sliding at the interface are observed. The micro-mechanism of the strain localization in the failure process of interface when debonding occurs and the strengthening mechanism at the imbedded fiber are discussed. The experimental results show that the meso-scale strain localization gives rise to the localization of shear damage near the fiber interface. This strain localization characterized by the debonding process near the interface occurs, develops and moves gradually at an apparently regular interval. At the elbow part of the imbedded fiber, the peak value of the shearing stress occurs. But the primary debonding does not occur at this place because the strength of the shear damage is increased at the local area of the elbow part in the concrete, displaying an apparent reinforced effect at the end of the fiber.

阐述了知识经济的概念与知识经济时代的特征,指出知识经济时代物流人才的能力结构要求,最后提出了知识经济时代物流企业人力资源管理的新理念.

以探讨我国公共图书馆资源配置公平性为目的,应用基尼系数和和洛伦茨曲线,对我国31个地区的公共图书馆数、从业人数、高级职称人数、馆藏总量、本年新购藏量、财政拨款、图书购置费、计算机数、年流通人次、书刊文献外借册数、累计发放有效借阅证数、读者活动参加人次12个指标的人口公平性进行分析.结果显示,公共图书馆数、从业人数、计算机数3个指标的公平性较好,其他9个指标的公平性较差,其中图书购置费的不公平性很大.研究结论可为我国公共图书馆资源公平配置提供实证依据.