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过渡金属离子与有机物对钢铁的缓蚀协同效应 总被引：1，自引：0，他引：1
从过渡金属离子的特点、过渡金属离子对钢铁的缓释作用机理、及其与有机物对钢铁的缓释协同等方面,较全面地综述了过渡金属离子与有机物缓蚀体系应用于钢铁的研究现状,并结合铁质文物保护技术要求,提出了模拟制作铁质文物试片,选择合适的过渡金属离子与有机物,借鉴现代钢铁缓释剂研究的分析技术,开展铁质文物保护研究课题的技术路线. 相似文献
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明万历胡氏文会堂刻本《胡氏粹编》,仅国家图书馆收藏,堪称海内外孤本①.《胡氏粹编》为选编类丛书,收文1100多篇(首),内容非常丰富,具有较高的学术研究价值. 相似文献
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啤酒馆问题与近代早期英国文化和价值观念的冲突 总被引：1，自引：1，他引：0
啤酒馆问题是16、17世纪英国社会普遍关注的问题。社会史学家认为啤酒馆问题与统治阶级对社会秩序的担心有关。本文从宗教改革以及市场经济、资本主义兴起的影响入手,对这一问题作进一步探讨,指出啤酒馆问题反映了基督禁欲主义同传统习俗的冲突、新教个人主义同睦邻文化的冲突,以及新兴“中等收入者”的价值观念和生活态度同传统价值观念和生活态度的冲突。啤酒馆问题折射出英国从传统向近代过渡时期思想文化方面的变化。 相似文献
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Gongbing Shan Xiang Zhang Bingjun Wan Daifeng Yu Brandie Wilde Peter Visentin 《Interdisciplinary science reviews : ISR》2019,44(1):12-20
Kicking in soccer has been the subject of scientific research for more than 40 years yet review articles summarizing the biomechanical fundamentals of kick optimization as a guide to coaching are scarcely to be found. The current review article aims to bridge the gap between scientific research into the maximal instep kick (including studies employing 3D motion capture and full-body biomechanical modelling) and the application of such research in coaching. It does so by supplying a scientifically founded, coaching-friendly article explaining identifiable characteristics and motor control sequencing that define this skill. Relevant biomechanical factors are identified in a way that should help coaches better develop training programmes and, at the same time, foster better understanding of the skill among athletes. Such information will contribute to both accelerated skill acquisition and, by concomitant gains in skill efficiency, the development of programmes that minimize risk of injury to athletes during training. 相似文献
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The township of Yulmed is situated in Luntse County in Lhoka City.The area attracted nationwide attention when Chinese President Xi Jinping replied to a letter ... 相似文献
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Da Ha Tarek H. Abdoun Michael J. O'Rourke Michael D. Symans Thomas D. O'Rourke Michael C. Palmer 《Journal of Earthquake Engineering》2013,17(5):646-669
Permanent ground deformation (PGD) is one of the most damaging hazards for continuous buried lifelines. This hazard is especially severe when the PGD results in net compression in the pipe. In that case, buckling of pipe material can occur. If buckling is moderate, deformation of the pipe cross-section can lead to flow restriction and high friction losses, and eventually require line replacement. If buckling is severe, high localized strains can lead to pipe rupture, loss of contents, and possible pollution of surrounding soil. In this article, centrifuge tests of buried pipelines subject to abrupt ground failure in the form of surface faulting are presented. The fault movement results in mostly compression in the pipe. The test results are compared with a case history of pipe failure in the 1999 Izmit, Turkey earthquake and also with the results from the centrifuge tests which result in net tension in the pipe. The experimental setup, procedures, and instrumentation are described in detail. Suggestions for design practice are offered based on the analysis of results from both the 1999 Izmit case history and the centrifuge modeling. 相似文献
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自然可以对儿童身心、认同和社会关系产生重要的影响。儿童与自然的关系的地理学研究成果在2015年后呈爆发式增长态势。研究主要聚焦于三个话题：有关儿童与自然接触的研究,包括如何让普通的儿童和有特殊照顾需要的儿童更好的接触自然,以及影响儿童与自然接触的社会文化因素;儿童自然认知的研究,包括儿童的自然意象、校园自然和户外自然作为教育空间的相关研究;儿童自然情感的研究,包括儿童的自然体验、儿童与自然及中介的关系,自然对儿童情感的影响相关的研究。本文呼吁学界能更多关注中国情境下儿童人地关系。 相似文献
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文物界修复编钟残件的传统方法是对编钟先矫形后胶接或钎焊,使用这种方法可以做到\"形似\",但无法获得良好的声音.为同时能获得良好的声音,通过对矫形定位、焊接方法、焊接材料、修复声弓等修复环节进行研究,采用激光焊接技术修复九连墩出土的破损双音编钟.修复结果表明,不仅复原了编钟的外观尺寸和形貌特征,而且在音频、音品方面恢复了双音编钟的乐钟特征,实现了破损双音编钟的形、声复原.研究成果可为古代金属乐器的形、声复原提供了一套全新的技术路线和工艺流程. 相似文献