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Experimental investigations on structural improvement of morphing mechanism for nose cone of aerospace vehicle adopting a bionic redundant constraint strategy

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Science China(Technological Sciences) 2023年第4期66卷 1075-1095页

作者： zhang yuling LI ChengXiang zhang Yan CAI QiaoYan YAN ShaoZe Division of Intelligent and Biomechanical Systems State Key Laboratory of Tribology in Advanced EquipmentDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China China Academy of Launch Vehicle Technology Beijing 100071China

Aerospace vehicles have recently received great attention for their completely reusable in aviation and *** achieve the optimal aerodynamic performance of the aerospace vehicle,the nose cone needs to change its aerodynamic shape under different flight ***,the structural design of a morphing nose cone that is capable of changing aerodynamic shape adaptively and withstanding prescribed aerodynamic loads remains an ongoing *** overcome this issue and to further advance our previous work,the motion performance of a morphing nose cone inspired by the deformation mechanism of the honeybee abdomen was tested to evaluate the deformation ability and bearing *** dynamic prediction analysis of the morphing nose cone with a clearance joint and flexible links was then investigated to elucidate the crucial issues in the deformation *** improve the motion performance,a performance improvement scheme based on redundant constraints drawn from the muscle distribution of the honeybee abdomen was ***,the structural stiffness,dynamic analysis,and experimental testing of the improved morphing nose cone were *** experimental results indicate that the extension and contraction ratios and bending angles of the improved morphing nose cone under loads of 0,10,and 25 kg loads improve by 1.51%and 2.329°,2.78%and-1.902°,and 5.06%and 1.111°,respectively,verifying the rationality and effectiveness of the performance improvement *** work provides a new reference for the design of the morphing structure for aerospace vehicles.

关键词： morphing nose cone experimental investigation dynamic analysis performance improvement bionic design

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Construction of superhydrophobic directly Z-scheme bismuth oxybromide/silver phosphate fabric surface with UV shielding and enhanced visible light absorption activity

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Science China(Technological Sciences) 2021年第4期64卷 785-792页

作者： GE Bo zhang yuling zhang TingXiao REN GuiNa LI WenZhi ZHAO Hui School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China School of Environmental and Material Engineering Yantai UniversityYantai 264405China

Various forms of pollutants discharged from industrial and life;how to treat the opposite water-soluble pollutants at the same time is a ***,a superhydrophobic BiOBr/Ag3PO4 fabric(SH fabric)bulk material was prepared aiming at the diversity of ***(WCA=160°)and oil contaminants(spread)have different wetting behavior on fabric *** high recovery efficiency for oil pollutants was achieved by using the selective oil removal property of the SH ***,the pollutants in the aqueous phase were removed by photocatalyst after oil/water *** analysis demonstrated that the direct Z-type heterojunction formed between BiOBr(EVB=1.66 eV;ECB=-1.08 eV)and Ag3PO4(EVB=3.03 eV;ECB=0.6 eV).It is worth noting that the SH fabric exhibited good mechanical stability and UV shielding performance,which have potential application in environmental control.

关键词： superhydrophobic UV shielding oil-water separation pollutant removal

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Spatial Structure of China's E-commerce Express Logistics Network Based on Space of Flows

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Chinese Geographical Science 2023年第1期33卷 36-50页

作者： LI Yuanjun WU Qitao zhang yuling HUANG Guangqing zhang Hongou Guangzhou Institute of Geography Guangdong Academy of SciencesGuangzhou 510070China

The intermediate link compression characteristics of e-commerce express logistics ne tworks influence the tradition al mode of circulation of goods and economic organization,and alter the city spatial *** on the theory of space of flows,this study adopts China Smart Logistics Network relational data to build China's e-commerce express logistics network and explore its spatial structure characteristics through social network analysis(SNA),the PageRank technique,and geospatial *** results are as follows:the network density is 0.9270,which is close to 1;hence,indicating that e-commerce express logistics lines between Chinese cities are nearly complete and they form a typical network structure,thereby eliminating fragmented ***,the average minimum number of edges is 1.1375,which indicates that the network has a small world effect and thus has a high flow efficiency of logistics elements.A significant hierarchical diffusion effect was observed in dominant flows with the highest edge weights.A diamond-structured network was formed with Shanghai,Guangzhou,Chongqing,and Beijing as the four core *** node cities with a large logistics scale and importance in the network are mainly located in the 19 city agglomerations of China,revealing the fact that the development of city agglomerations is essential for promoting the separation of experience space and changing the urban spatial *** study enriches the theory of urban networks,reveals the flow laws of modern logistics elements,and encourages coordinated development of urban logistics.

关键词： space of flows e-commerce express logistics urban logistics network logistics big data

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Enterovirus D68 infection upregulates SOCS3 expression to inhibit JAK-STAT3 signaling and antagonize the innate interferon response of the host

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Virologica Sinica 2023年第5期38卷 755-766页

作者： yuling zhang Leling Xu Zhe zhang Xin Su Zhiyun Wang Tao Wang School of Life Sciences Tianjin UniversityTianjin300072China School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Institute of Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures Tianjin300072China

Enterovirus D68(EV-D68)can cause respiratory diseases and acute flaccid paralysis,posing a great threat to public *** are cytokines secreted by host cells that have broad-spectrum antiviral effects,inducing the expression of hundreds of interferon-stimulated genes(ISGs).EV-D68 activates ISG expression early in infection,but at a later stage,the virus suppresses ISG expression,a strategy evolved by EV-D68 to antagonize ***,we explore a host protein,suppressor of cytokine signaling 3(SOCS3),is upregulated during EV-D68 infection and antagonizes the antiviral effects of type I *** subsequently demonstrate that the structural protein of EV-D68 upregulated the expression of RFX7,a transcriptional regulator of SOCS3,leading to the upregulation of SOCS3 *** exploration revealed that SOCS3 plays its role by inhibiting the phosphorylation of signal transducer and activator of transcription 3(STAT3).The expression of SOCS3 inhibited the expression of ISG,thereby inhibiting the antiviral effect of type I interferon and promoting EV-D68 transcription,protein production,and viral ***,a truncated SOCS3,generated by deleting the kinase inhibitory region(KIR)domain,failed to promote replication and translation of *** on the above studies,we designed a short peptide named SOCS3 inhibitor,which can specifically bind and inhibit the KIR structural domain of SOCS3,significantly reducing the RNA and protein levels of *** summary,our results demonstrated a novel mechanism by which EV-D68 inhibits ISG transcription and antagonizes the antiviral responses of host type I interferon.

关键词： Enterovirus D68(EV-D68) Interferon ISG SOCS3 STAT3

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Inhibition mechanism of air nanobubbles on brass corrosion in circulating cooling water systems

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Chinese Journal of Chemical Engineering 2023年第10期62卷 168-181页

作者： yuling zhang Shaolei Lu Delie Li Haiyang Duan Congwen Duan Jinghong zhang Songtao Liu Department of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China

Air nanobubbles(A-NBs)were used to inhibit the brass corrosion in circulating cooling water for the first time in the *** results of mass loss method and electrochemical method showed that A-NBs had the obvious corrosion inhibition *** inhibition rate reached 52%at 35℃.The impedance and surface characterization results of corrosion samples indicated that the corrosion inhibition mechanisms of A-NBs mainly included adsorption of corrosion ions,promoting the formation of the passivation film on metal surface and the formation of the bubble layer and scale film on metal surface.A-NBs are potential excellent corrosion inhibitors.

关键词： Brass Air nanobubble Passivation film Bubble layer Corrosion inhibition

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A New Discovery of Early Carboniferous Gabbros in the Southern Chinese Altai: Evidence for Ridge Subduction

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Acta Geologica Sinica(English Edition) 2020年第4期94卷 1308-1309页

作者： WANG Zuopeng LI Yongjun YANG Gaoxue zhang yuling CHAO Wendi School of Earth Science and Resources Chang'an UniversityXi'an 710054China Shaanxi Yanchang Petroleum(Group)Corp.Ltd. Yan'anShaanxi 716099China Northwest Geological Exploration Institute of China Metallurgical Geology Bureau Xi'an 710119China

Objective The Chinese Altai as a key part of the Central Asian Orogenic Belt is characterized by numerous outcrops of Paleozoic granitoids and minor mafic plutons (Fig. 1a). It is widely accepted that Devonian ridge subduction played an important role in the tectonic evolution of the Chinese Altai. However, Carboniferous magmatism related to ridge subduction has received little attention. Moreover。

关键词： Carboniferous Altai tectonic

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Experimental analysis of interface contact behavior using a novel image processing method

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Chinese Physics B 2021年第5期30卷 412-423页

作者： Jingyu Han Zhijun Luo yuling zhang Shaoze Yan State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

The spatial and temporal evolution of real contact area of contact interface with loads is a *** is generally believed that there is a positive linear correlation between real contact area and normal ***,with the development of measuring instruments and methods,some scholars have found that the growth rate of real contact area will slow down with the increase of normal load under certain conditions,such as large-scale interface contact with small roughness surface,which is called the nonlinear phenomenon of real contact *** present,there is no unified conclusion on the explanation of this *** set up an experimental apparatus based on the total reflection principle to verify this phenomenon and analyze its *** image processing method is proposed,which can be used to quantitative analysis micro contact behaviors on macro contact *** weighted superposition method is used to identify micro contact spots,to calculate the real contact area,and the color superimposed image is used to identify micro contact *** on this method,the spatiotemporal evolution mechanism of real contact area nonlinear phenomena is quantitatively ***,the influence of nonlinear phenomenon of real contact area on the whole loading and unloading process is analyzed *** is found that the effects of fluid between contact interface,normal load amplitude and initial contact state on contact behavior cannot be ignored in large-scale interface contact with small roughness surface.

关键词： real contact area total reflection method micro-contact spots interface contact experimental analysis

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Travel Behaviours of Sharing Bicycles in the Central Urban Area Based on Geographically Weighted Regression: The Case of Guangzhou, China

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Chinese Geographical Science 2021年第1期31卷 54-69页

作者： WEI Zongcai ZHEN Feng MO Haitong WEI Shuqing PENG Danli zhang yuling School of Architecture State Key Laboratory of Subtropical Building ScienceSouth China University of TechnologyGuangzhou 510641China School of Architecture and Urban Planning Nanjing UniversityJiangsu Provincial Engineering Laboratory of Smart City Design Simulation&VisualizationNanjing 210093China Guangzhou Institute of Geography Guangzhou 510070China

Mobile information and communication technologies(MICTs) have fully penetrated everyday life in smart societies;this has greatly compressed time, space, and distance, and consequently, reshaped residents’ travel behaviour patterns. As a new mode of shared mobility, the sharing bicycle offers a variety of options for the daily travel of urban residents. Extant studies have mainly examined the travel characteristics and influencing factors of public bicycles with piles, while the travel patterns for sharing bicycles and their driving mechanisms have been largely ignored. Using one week’s travel data for Mobike, this study investigated the spatial and temporal distribution patterns of sharing bicycle travel behaviours in the central urban area of Guangzhou, China;furthermore, it identified the influences of built environment density factors on sharing bicycle travel behaviours based on the geographically weighted regression method. Obvious morning and evening peaks were observed in the sharing bicycle travel patterns for both weekdays and weekends. The old urban area, which had a high degree of mixed function, dense road networks, and cycling-friendly built environments, was the main travel area that attracted sharing bicycles on both weekdays and weekends. Furthermore, factors including the point of interest(POI) for the density of public transport stations, the functional mixing degree, and the density of residential POIs significantly affected residents’ travel behaviours. These findings could enrich discourse regarding shared mobility with a Chinese case characterised by rapidly developing MICTs and also provide references to local authorities for improving slow traffic environments.

关键词： sharing bicycles travel behaviours smart societies geographically weighted regression analysis Guangzhou,China

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Thin bed responses and correction methods for cased hole density logging

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Petroleum Science 2008年第4期5卷 322-325页

作者： Wu Wensheng zhang yuling State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China China National Logging Corporation CNPC Beijing 100101 China

The study of the thin bed responses and correction methods in cased hole density logging can provide a theoretical basis for research to improve data processing methods. By using the Monte Carlo program MCNP, the change of detector count from thin beds with the vertical depth was calculated at different casing thicknesses. The calculation showed that with the low density thin bed moving upward, detector count first increased to a maximum then decreased. The responses of a thin bed with a high density were opposite to those of a thin bed with a low density. The change curve was symmetrical, and the maximums or minimums appeared at the midpoint between the detector and source. Besides, detector count increased with increasing thin bed thickness. At a specific thin bed thickness, further increase of thin bed thickness resulted in a slow increase of detector count then the count rate leveled off. In actual logging, the influence of adjacent formations on density log measurements can be ignored. Finally, based on numerical simulation correction methods for the dual influence of casing and thin beds are discussed.

关键词： Density logging in cased hole thin bed response casing MCNP program correcting

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A numerical study for some efficient time-integration schemes using barotropic equations

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Acta Oceanologica Sinica 1989年第1期8卷 77-89页

作者： Han Wei and zhang yuling Department of Geophysics, Peking University, Beijing, China China

Three kinds of methods, i. e., explicit, semi-implicit, and semi-implicit and semi-Lagrangian method, are tested in the time-integration of shallow-water equations on rotating sphere. Helpful results are available fro... 详细信息

关键词： time A numerical study for some efficient time-integration schemes using barotropic equations

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