矛盾分析法下的短视频时代网络购物矛盾

矛盾分析法是马克思主义哲学认识世界的根本方法，通过分析事物存在的矛盾，理清事物本质之间的联系与区别，从矛盾观入手，对事物做出正确的认识和改造，促进事物的发展。矛盾分析法要求具体问题具体分析，把握主要矛盾，抓住矛盾的主要方面。在社会生活中，矛盾分析法具有普遍适用性。当下，网络购物逐渐成为社会主流购物方式，网购热潮下存在的矛盾也越来越突出，运用矛盾分析法对这些矛盾进行正确分析，对网络经济的发展具有重要意义。文章基于矛盾分析法，探讨网络购物存在的主要矛盾。     

小儿血栓性血小板减少性紫癜1例

1病例 患儿，女，11岁，不明原因发热半月，体温波动在39℃～40℃，伴畏寒、腹痛、咳嗽，继之出现尿黄、嗜睡、谵妄等。入院前1d出现鼻衄，伴解黑稀便数次共约200mL。查体：T39．8℃，P142次／min，R24次／min，BP90／50mmHg；重度贫血貌，嗜睡状，皮肤巩膜中度黄染，四肢静脉曾经穿刺的部位可见瘀斑，浅表淋巴结未扪及肿大，心肺无特殊，腹平软，肝脏右肋下4cm，     

Research on Two Main Construction Methods of Concept Lattices

Because of the completeness of concept lattices, the time complexity of constructing concept lattices has become the main factor affecting the application of formal concept analysis(FCA). The key problems in the research of concept lattices are how to improve the generation efficiency and how to reduce the space and time complexity of constructing concept lattices. So far, reviews on lattice construction algorithms have not been comprehensive. In view of this situation, we give a detailed review on two categories of construction algorithms:batch methods and incremental methods. The first category is a formal context that cannot be updated once the concept lattice has been constructed; the second category is a formal context that can be updated after a new object being added to the formal context. We briefly introduce classical and improved construction methods, illustrate the deficiencies of some algorithms and point out the improvements of the follow-up algorithms. Furthermore, we compare and discuss several key algorithms, and also pay attention to the application of concept lattices. Finally,two further research directions of concept lattices are proposed, including parallel construction methods of concept lattices and research of heterogeneous data concept lattices.     

大直径盾构始发阶段负环管片及螺栓受力优化分析

为进一步改善负环管片及螺栓受力、保障施工安全性,依托广州地铁18号线沙溪站至石榴岗站区间盾构始发工程,采用MIDAS/GTS有限元分析软件建立负环管片精细化模型,研究负环管片及螺栓在大直径盾构始发全施工期内的变形情况与应力特征.结果表明:负环管片变形主要受自重影响,除中间部分负环变形不稳定外,整体上位移呈沿纵向快速减小...