液滴撞击凹凸槽道表面液膜的动态演变     

周鑫  王宏  朱恂  陈蓉  廖强  丁玉栋 《中国科学院大学学报》2020,37(2):255-262

为研究固体表面结构对液滴撞击液膜后演变行为的影响规律，采用CLSVOF方法模拟液滴撞击不同尺寸槽道上的表面液膜的流动过程，获得不同槽道高度和宽度时液滴撞击液膜后的演变行为，探索撞击速度、液膜黏度和表面张力对撞击后液膜铺展行为、水花飞溅高度和二次液滴形成的影响。结果表明，槽道结构对液滴撞击液膜后的动态行为具有显著影响，随着槽道高度的增加，冠状水花厚度越薄，越容易产生二次液滴；随着液膜黏度的增大，则抑制冠状水花形成与二次液滴的产生；液膜表面张力减小时，射流更加明显，二次液滴数更多，飞溅现象提前，冠状水花消失时间延后。  相似文献   

气膜厚度对反气泡稳定性的影响     

安骥  何随龙  王鑫  陈磊  李根  郑洪 《上海海事大学学报》2020,41(1):111-115

为观察气膜厚度对反气泡稳定性的影响,通过加热反气泡内外溶液来加热气膜内气体从而改变气膜厚度。实验发现:在一定温度范围内,加热反气泡气膜可以延长其稳定时间,但是当加热反气泡气膜使其厚度超过其稳定存在的阈值时,反气泡的稳定性会急剧下降甚至无法产生反气泡;在一定温度范围内温度对溶液表面张力影响很小,这使得文中实验数据合理化。本文为反气泡稳定性的理论研究提供实验支持,并考虑到气膜厚度为微米级,可为微米级气膜传热提供实验素材。  相似文献   

大学生孤独感对手机成瘾倾向的影响:生命意义感的调节作用     

陆娟  宫火良 《保定学院学报》2020,(3):95-100

为了探究大学生孤独感、手机成瘾倾向和生命意义感之间的关系,采用UCLA孤独量表、大学生手机成瘾倾向量表、人生意义感问卷,选取408名大学生作为被试进行问卷调查。结果发现:(1)孤独感与手机成瘾倾向呈显著性正相关,生命意义感与手机成瘾倾向呈显著性负相关,孤独感和生命意义感相关性不显著;(2)孤独感和生命意义感都显著预测手机成瘾倾向,生命意义感在孤独感和手机成瘾倾向之间的调节效应显著,低生命意义感大学生的孤独感对手机成瘾倾向的预测力更强。因此,大学生的孤独感能正向预测手机成瘾倾向,生命意义感能调节二者之间的关系,低水平的生命意义感会加剧孤独感对手机成瘾倾向的预测作用,而高水平的生命意义感会使孤独感对手机成瘾倾向的影响较小。  相似文献   

【新水令】曲牌风格流变探析     

王方好  阎方正 《保定学院学报》2020,(1):85-91

曲牌【新水令】由同名词牌演化而来,最初被运用在南戏《张协状元》之中,用于表达慷慨激越的感情风格。该曲牌具有较强的灵活性,从元代到清代,其题材不断被拓宽,感情色彩也不断发生变化,不再局限于慷慨激越的声情风格,表达的情感也更为丰富。分析梳理【新水令】这一曲牌在元明清三代的风格变化,可以对其有更为深入的了解,亦有助于对于曲史样式的研究。  相似文献   

粤港澳大湾区经济中心对粤北地区的经济辐射作用分析——以清远市为例     

周婷 《清远职业技术学院学报》2020,(2):12-16

发挥经济中心对周边地区的经济辐射作用对一个区域的经济协同发展具有重要意义。粤北地区特别是清远市可以说是藏在粤港澳大湾区经济焦点下的盲点。借助地理距离优势,跨越发展鸿沟,使周边地区与粤港澳大湾区实现融合式互动和一体化发展,是一个具有重要研究价值的问题。可以将粤港澳大湾区及其周边地区作为一个城市群,描述和测算其基本发展现状及经济分布格局,探索经济辐射的必要性与可能的辐射路径。  相似文献   

Some Theory for the Conservation of Contemporary Art     

Rosario Llamas-Pacheco 《文物保护研究》2020,65(8):487-498

ABSTRACT

This article analyzes different ontological categories and how they relate to the conservation of contemporary art. Faced with the necessity of apprehending the work of art from an ontological point of view, a theoretical approach is made on the concepts that most affect the conservation of contemporary art: quiddity, truth-authenticity, identity, quality, consistency, and interpretation. These are analyzed from an empirical perspective, based on the experience of conservation and restoration. Since conserving and restoring require making decisions that will affect the material and conceptual plane of the works, several possible paradigms that must be introduced into the deontological code of the profession are analyzed. In addition, the study of a new paradigm is provided, that of the death of the work of art. This paradigm can serve as a frame of reference, given the impossibility of bringing the ‘Truth’ of the artwork into the world of the sensitive. This may occur due to different conditioning factors and limitations of a material, technical, or intentional type, which affect issues that were once established as essential to the entity. On the other hand, different types of time that are related to the conservation of contemporary art are studied: biological time, the eternal present of the work, time as a constructor agent, and destructive time as a facilitator of the appearance of ruin or ruin-relic in the work of art.  相似文献   

MARC to BIBFRAME: Converting the PCC to Linked Data     

Jacquie Samples  Ian Bigelow 《Cataloging & classification quarterly》2020,58(3-4):403-417

Abstract

The Program for Cooperative Cataloging (PCC) has formal relationships with the Library of Congress (LC), Share-VDE, and Linked Data for Production Phase 2 (LD4P2) for work on Bibliographic Framework (BIBFRAME), and PCC institutions have been very active in the exploration of MARC to BIBFRAME conversion processes. This article will review the involvement of PCC in the development of BIBFRAME and examine the work of LC, Share-VDE, and LD4P2 on MARC to BIBFRAME conversion. It will conclude with a discussion of areas for further exploration by the PCC leading up to the creation of PCC conversion specifications and PCC BIBFRAME data.  相似文献   

中国共产党领导下的大连福岛纺织株式会社工人大罢工     

杨守忠 《兰台世界》2020,(4):126-128

1926年4月27日,因无法忍受日本资本家的残酷压榨和剥削,大连福岛纺织株式会社1000余名工人举行了声势浩大的罢工。罢工过程中,日本资本家采取了种种惨无人道的压迫手段逼迫工人复工。在中国共产党的领导下,工人们团结一致,坚定信念,最终取得罢工斗争的胜利,充分展示了中国工人阶级的强大力量,而中国共产党的领导对此次罢工的胜利起到了决定性的作用。  相似文献   

声像档案视域下非物质音乐文化遗产的保护与传承     

张国廷 《档案管理》2020,(3):80-81

非物质音乐文化遗产是一个地区历史进程中风土人情的体现,是当地人民在生产生活中的文化结晶,它凝聚了中国千百年来的历史,是中国非物质文化遗产的重要组成部分。随着社会的不断发展,非物质音乐文化遗产的表现形式与现代审美之间的距离越来越大,直接导致非物质音乐文化遗产的传承面临断层。由此,对非物质音乐文化遗产的保护与传承工作迫在眉睫。本文探讨了应用现代声像技术开展非物质音乐文化遗产的保护工作,希望为传统音乐文化遗产的保护与传承提供一些有价值的参考。  相似文献   

Impact of combining data from multiple instruments on performance of patient-based real-time quality control     

Qianqian Zhou  Tze Ping Loh  Tony Badrick  Chun Yee Lim 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(2)

IntroductionIt is unclear what is the best strategy for applying patient-based real-time quality control (PBRTQC) algorithm in the presence of multiple instruments. This simulation study compared the error detection capability of applying PBRTQC algorithms for instruments individually and in combination using serum sodium as an example.Materials and methodsFour sets of random serum sodium measurements were generated with differing means and standard deviations to represent four simulated instruments. Moving median with winsorization was selected as the PBRTQC algorithm. The PBRTQC parameters (block size and control limits) were optimized and applied to the four simulated laboratory data sets individually and in combination.ResultsWhen the PBRTQC algorithm were individually optimized and applied to the data of the individual simulated instruments, it was able to detect bias several folds faster than when they were combined. Similarly, the individually applied algorithms had perfect error detection rates across different magnitudes of bias, whereas the error detection rates of the algorithm applied on the combined data missed smaller biases. The performance of the individually applied PBRTQC algorithm performed more consistently among the simulated instruments compared to when the data were combined.DiscussionWhile combining data from different instruments can increase the data stream and hence, increase the speed of error detection, it may widen the control limits and compromising the probability of error detection. The presence of multiple instruments in the data stream may dilute the effect of the error when it only affects a selected instrument.  相似文献