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Study of the mechanics of progressive collapse of FPB isolated beam-pier substructures

Jingcai ZHANG; Yong DING; Xinchun GUAN

《结构与土木工程前沿（英文）》 2022年第16卷第6期页码 718-728 doi: 10.1007/s11709-022-0815-3

摘要： The horizontal stiffness of the isolated layer is reduced substantially by a friction pendulum bearing (FPB) toprotectthe structure from potential damages caused by earthquakes. However, horizontal stiffness is essential to progressive collapse resistance of structures. This paper presents a simplified model to assess the progressive collapse response of beam-pier substructure isolated by FPB. Progressive collapse resistance by flexural action of the beam and additional resistance owing to the horizontal restraining force was achieved. The influences of the equivalent radius and friction coefficient of the FPB, the applied axial force on the FPB, and span-depth ratio of the beam on the additional resistance were investigated. Simulations were conducted to verify the proposed model. The results show that progressive collapse resistance provided by horizontal restraining can be reduced as large as 46% and 88% during compressive arching action (CAA) and catenary action (CA), respectively. The equivalent radius of the FPB shows limited effect on the progressive collapse response of FPB isolated structures, but friction coefficient and applied axial force, as well as depth ratio of the beam, show significant influences on the additional progressive collapse resistance capacity. Finite element method (FEM) results are in good agreement with the result obtained by the proposed method.

关键词： friction pendulum bearing progressive collapse horizontal stiffness compressive arching action catenary action

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Review of pantograph and catenary interaction

Weihua ZHANG, Dong ZOU, Mengying TAN, Ning ZHOU, Ruiping LI, Guiming MEI

《机械工程前沿（英文）》 2018年第13卷第2期页码 311-322 doi: 10.1007/s11465-018-0494-x

摘要：

The application of electrified railway directly promotes relevant studies on pantograph-catenary interaction. With the increase of train running speed, the operating conditions for pantograph and catenary have become increasingly complex. This paper reviews the related achievements contributed by groups and institutions around the world. This article specifically focuses on three aspects: The dynamic characteristics of the pantograph and catenary components, the systems’ dynamic properties, and the environmental influences on the pantograph-catenary interaction. In accordance with the existing studies, future research may prioritize the task of identifying the mechanism of contact force variation. This kind of study can be carried out by simplifying the pantograph-catenary interaction into a moving load problem and utilizing the theory of matching mechanical impedance. In addition, developing a computational platform that accommodates environmental interferences and multi-field coupling effects is necessary in order to further explore applications based on fundamental studies.

关键词： electrified railway pantograph and catenary interaction contact force variation moving load problem mechanical impedance multi-field

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View-invariant human action recognition via robust locally adaptive multi-view learning

Jia-geng FENG,Jun XIAO

《信息与电子工程前沿（英文）》 2015年第16卷第11期页码 917-920 doi: 10.1631/FITEE.1500080

摘要： Human action recognition is currently one of the most active research areas in computer vision. It has been widely used in many applications, such as intelligent surveillance, perceptual interface, and content-based video retrieval. However, some extrinsic factors are barriers for the development of action recognition; e.g., human actions may be observed from arbitrary camera viewpoints in realistic scene. Thus, view-invariant analysis becomes important for action recognition algorithms, and a number of researchers have paid much attention to this issue. In this paper, we present a multi-view learning approach to recognize human actions from different views. As most existing multi-view learning algorithms often suffer from the problem of lacking data adaptiveness in the nearest neighborhood graph construction procedure, a robust locally adaptive multi-view learning algorithm based on learning multiple local L1-graphs is proposed. Moreover, an efficient iterative optimization method is proposed to solve the proposed objective function. Experiments on three public view-invariant action recognition datasets, i.e., ViHASi, IXMAS, and WVU, demonstrate data adaptiveness, effectiveness, and efficiency of our algorithm. More importantly, when the feature dimension is correctly selected (i.e.,>60), the proposed algorithm stably outperforms state-of-the-art counterparts and obtains about 6% improvement in recognition accuracy on the three datasets.

关键词： View-invariant Action recognition Multi-view learning L1-norm Local learning

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China released the Action Plan on Prevention and Control of Soil Pollution

Fang Zhang,Guanghe Li

《环境科学与工程前沿（英文）》 2016年第10卷第4期 doi: 10.1007/s11783-016-0867-5

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Effect of mineral additives and permeability reducing admixtures having different action mechanisms on

《结构与土木工程前沿（英文）》 2021年第15卷第5期页码 1277-1291 doi: 10.1007/s11709-021-1752-2

摘要： In this paper, the effect of usage of the permeability reducing admixture (PRA) having different action mechanisms on hardened state properties of cementitious systems containing mineral additives is examined. For this aim, three commercial PRAs were used during investigation. The effective parameters in the first and third PRAs were air-entraining and high-rate air-entraining, respectively. The second one contained the insoluble calcium carbonate residue and had a small amount of the air-entraining property. Mortar mixes with binary and ternary cementitious systems were prepared by partially replacing cement with fly ash and metakaolin. The hardened state properties of mortar mixtures such as compressive strength, ultrasonic pulse velocity, water absorption, drying shrinkage and freeze–thaw resistance were investigated. The ternary cement-based mixture having both fly ash and metakaolin was selected as the most successful mineral-additive bearing mix in regard to hardened state properties. In this sense, PRA-B, with both insoluble residues and a small amount of air-entraining properties, showed the best performance among the mixtures containing PRA. The combined use of mineral additive and PRA had a more positive effect on the properties of the mixes.

关键词： cementitious system mineral additive permeability reducing admixture mechanical properties durability performance

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Study on the action of resistin-induced human umbilical vein endothelial cell dysfunction

LI Zhizhen, LI Fangping, YAN Li, LI Feng, LI Yan, CHENG Hua, FU Zuzhi

《医学前沿（英文）》 2007年第1卷第2期页码 196-199 doi: 10.1007/s11684-007-0037-z

摘要： The aim of this paper was to investigate the effects of resistin on human umbilical vein endothelial cells (HUVECs), and to explore its role and mechanism of action in atherosclerosis. HUVECs were incubated with recombinant human resistin (0, 50, 100 ng/mL) for 24 h. ICAM-1, VCAM-1 and reactive oxygen species (ROS) were assayed by flow cytometer. ET-1, eNOS and iNOS mRNA expression were measured by semi-quantitative RT-PCR. Incubation of HUVECs with resistin resulted in an increase in ICAM-1 expression and ET-1 mRNA expression. However, resistin had no effect on VCAM-1 expression and ROS release. eNOS and iNOS mRNA expression were not altered by resistin stimulation. Adipokine resistin exerted a direct effect in promoting HUVEC dysfunction by promoting ICAM-1 and ET-1 expression. These data suggest that adipocyteendothelium cross-talk might play an important role in the pathogenesis of cardiovascular disease in diabetes mellitus.

关键词： endothelial resistin stimulation Incubation pathogenesis dysfunction

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Emerging contaminant control: From science to action

《环境科学与工程前沿（英文）》 2022年第16卷第6期 doi: 10.1007/s11783-022-1559-y

摘要： Since the concept of emerging contaminants (ECs) was first proposed in 2001, the global scientific research of ECs has developed rapidly. In the past decades, great progress has been achieved in the scientific research of ECs in China, including the establishment of EC analysis method system, the evaluation of the pollution status, pollution characteristics and environmental risk of ECs in typical regions of China, and establishment of EC control technology system. Continuous progress in scientific research of ECs promoted China’s action on EC control. It is planned that the environmental risk of ECs will be generally controlled by 2035 in China. Priority ECs should be screened for environmental management. Although great efforts have been made, the EC control in China still faces tremendous challenges. It is necessary to bridge the gap between scientific research and decision-making management. Based on the science and technology study, various measures such as engineering, policy management and public participation should be combinedly adopted for EC control.

关键词： Emerging contaminants Priority pollutants PPCPs POPs Control policy

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中国工程院推出“院士行动”计划

《中国工程科学》 1999年第1卷第1期页码 107-107

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“互联网 +”行动计划的政策体系研究

陈磊,王柏村,黄思翰,姚磊,边大成,范鑫

《中国工程科学》 2020年第22卷第4期页码 131-138 doi: 10.15302/J-SSCAE-2020.04.003

摘要：

“互联网 +”行动计划对推动我国产业升级和经济高质量发展具有重要意义，随着“互联网 +”迈向深度发展阶段、关联技术不断升级、新模式和新业态持续涌现，亟需总结发展现状并梳理面临的问题，以促进相应政策体系的调整完善。本文系统梳理国家、地方层面推进“互联网 +”的政策和规划以明晰当前政策发展现状，凝练“互联网 +”政策供给的主要问题，包括政策文件碎片化现象突出、地方政策文件同质化情况普遍、宏观政策的配套措施不具体、阶段性评估机制缺失。研究提出，在后续推进“互联网 +”发展的政策方面，需要健全“互联网 +”政策制定的系统化机制、完善高效协同的“互联网 +”政策推进工作机制、丰富对“互联网 +”行动的财政税收金融支持方式、建立“互联网 +”法律法规和标准规范体系。相关研究可为我国“互联网 +”行动计划的政策研究提供参考。

关键词：互联网 + 政策体系政策供给完善措施

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Initiation and propagation laws of the glass cracks in specimens subjected to normal loading under the action

WAN Zhen-ping, LIU Ya-jun, TANG Yong, YE Bang-yan

《机械工程前沿（英文）》 2006年第1卷第2期页码 194-198 doi: 10.1007/s11465-005-0011-x

摘要： With more and more applications of glass in advanced fields of science, the demand for glass machining precision has increased greatly. More and more attention is being paid to glass cutting because precise glass parts with various shapes can be obtained at high efficiency and low cost. To improve the machining precision of part surfaces and to facilitate tool design and cutting parameter selection, the initiation and propagation laws of glass cracks in specimens subjected to normal loading by symmetric wedges were investigated. Research results show that initiation and propagation laws are the same with interior symmetric wedge angles of 30o-120o, while the laws are different with interior symmetric wedge angles equal to or more than "e150o. The relationship between medial crack length and normal loading was also investigated when specimens were indented by symmetrical wedges with interior angles of 30o-120o.

关键词： different 30o-120o relationship initiation cutting parameter

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Technological lubricating means: Evolution of materials and ideas

Vladimir A. GODLEVSKIY

《机械工程前沿（英文）》 2016年第11卷第1期页码 101-107 doi: 10.1007/s11465-016-0369-y

摘要：

The main stages of technological lubricating material development from ancient times to date are described. How the chemical composition of these products changed with time, how new ideas revealing the physical and chemical basics of external media that influence the mechanical processing of materials appeared, how these ideas explained the differences between traditional tribology and specific technology of metal processing are discussed. The question of the possible realization of Rehbinder’s adsorption effect in contact zone is also stated. The description of a very captivating problem is related to the explanation of the mechanism of lubricant penetration into the contact zone between the material being processed and the tool. The birth and development of the hypothesis of microcapillary penetration of the lubricant into the dynamically changed intersurface clearance that has finally led to formulating the “necessary kinetic condition of the lubricating activity” is relayed.

关键词： technological lubrication and cooling metal cutting grinding lubrication action tribology

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Discovery of cryptolepine derivatives as novel promising agents against phytopathogenic bacteria

《化学科学与工程前沿（英文）》 2023年第17卷第2期页码 156-166 doi: 10.1007/s11705-022-2196-5

摘要： To ensure the production of food crops, a series of cryptolepine derivatives were synthesised, after which their antibacterial activities and mechanism of action against three plant pathogens were investigated. Our bioassay results indicated that most of the target compounds displayed potent inhibitory effects against Xanthomonas oryzae (X. oryzae) and Xanthomonas axonopodis pv. citri (X. axonopodis pv. c.). Remarkably, compound 9 exhibited the best in vitro antibacterial activity against X. oryzae, with a minimum inhibitory concentration (MIC) value of 0.78 μg·mL^–1. Compound 2 exhibited the best in vitro antibacterial activity against X. axonopodis pv. c., with an MIC value of 0.39 μg·mL^–1. These activities were superior to those of copper quinolate (MIC = 6.25, 25 μg·mL^–1) and thiodiazole copper (MIC = 100, 200 μg·mL^–1) against X. oryzae and X. axonopodis pv. c. In vivo experiments demonstrated the promising applicability of compound 9 for the control of rice bacterial infections. Furthermore, compound 9 was selected as a candidate to conduct preliminary analyses of the antibacterial mechanisms of cryptolepine derivatives. Scanning electron microscopy and transmission electron microscopy observations, extracellular polysaccharide production, biofilm formation, transcriptomic, quantitative reverse transcription-polymerase chain reaction analyses, and molecular docking assays were performed. Collectively, our findings demonstrated that compound 9 might act via multifarious mechanisms to down-regulate virulence factors and cause cell death.

关键词： cryptolepine derivatives phytopathogenic bacteria antibacterial activity mechanism of action

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Comprehensive analysis on China’s National Climate Change Assessment Reports: Action and emphasis

Bing WANG, Ge HONG, Chao-Qun CUI, Hao YU, Tad MURTY

《工程管理前沿（英文）》 2019年第6卷第1期页码 52-61 doi: 10.1007/s42524-019-0002-y

摘要： Climate change assessment is central for low-carbon management practice. This paper investigates China’s National Climate Change Assessment Reports of 2007, 2011, and 2015. These three reports are compared with other climate change assessment reports by data mining. The necessity of national climate change assessment is analyzed with the requirements at home and abroad. The latest progress surrounding climate change impacts, adaptation, and mitigation is outlined with the increasing temperature rise in China and the urgency of climate change commitments. The achievements in climate change assessment indicate the increasing climate change vulnerability on sectors and regions in China and the strategies and priorities for low-carbon actions. Distinct gaps and differences are identified in the coverage of industry, regions, and vulnerability assessment between our assessments and other evaluation reports. These gaps and differences demonstrate the importance and future improvements of China’s national climate change assessment in international climate governance. The outlook for China’s fourth assessment report is proposed.

关键词： climate change assessment low-carbon management impact adaptation mitigation

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基于文本挖掘的“中国制造”地区行动计划分析

孔德婧董放李昭甫屈贤明

《中国工程科学》 2017年第19卷第3期页码 149-158 doi: 10.15302/J-SSCAE-2017.03.021

摘要：

对各省市自治区“中国制造”地区行动计划重点发展领域的一致性与重点发展子领域的差异性开展分析，是全面了解各省市自治区行动计划的基础。本文提出了一种基于文本挖掘包括中文分词、特征筛选、相似度计算的政策文件分析方法，根据该方法所得的结果对各省市自治区行动计划的一致性和差异性进行了分析。

关键词：地区行动计划文本挖掘相似度计算

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通过定量分析植物初级代谢产物和酶代谢库发现除草剂新作用位点 Perspective

Franck E. Dayan, Stephen O. Duke

《工程（英文）》 2020年第6卷第5期页码 509-514 doi: 10.1016/j.eng.2020.03.004

摘要：

自20世纪80年代以来，具有新分子作用位点（SOA）的除草剂一直没有被发现。从那时起，杂草对大多数商用除草剂产生了广谱抗性，这极大地增加了对具有新SOA的除草剂的需求。本文讨论了两种未被尝试过的方法，用于发现除草剂的新SOA。一些初级代谢中间产物（如原卟啉IX和鞘氨醇碱）对植物有毒性，因此，在植物体内，这些化合物的浓度水平非常低。确定所有初级代谢产物的植物毒性和代谢库大小，有利于识别相关SOA。本文讨论的发现除草剂的第一种新方法是研究导致植物毒性化合物积累的SOA，第二种方法是识别体内酶水平非常低的潜在SOA。我们知道，SOA的酶分子数量越多，杀死植物所需的除草剂就越多。现代蛋白质组学方法可以识别酶水平较低的SOA，为除草剂的发现提供依据。这些方法可能有助于发现与天然化合物更紧密相关并且可以在低剂量下使用的除草剂。

关键词：天然产物合理的生物发现作用方式除草剂