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基于实测数据的斜拉索振动分析与小波包能量占比研究

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桥梁建设 2021年第3期51卷 25-31页

作者：郭健钟昊荪浙江工业大学桥梁工程研究所浙江杭州310023

为研究海域环境下跨海斜拉桥长斜拉索的振动响应特征及振动能量分布特点,以金塘跨海大桥为背景,对后期构建的局部实时监测系统采集的实测数据进行分析。研究斜拉索加速度信号的时域和频域特征,运用小波包分析对不同季节的斜拉索加速度... 详细信息

为研究海域环境下跨海斜拉桥长斜拉索的振动响应特征及振动能量分布特点,以金塘跨海大桥为背景,对后期构建的局部实时监测系统采集的实测数据进行分析。研究斜拉索加速度信号的时域和频域特征,运用小波包分析对不同季节的斜拉索加速度时程进行分解及重构,并计算振动能量在不同频带的能量占比。结果表明:金塘大桥桥址处风向以西北为主,近似垂直于斜拉索索面;斜拉索振动以面内振动为主,存在多模态耦合现象,且振动波形在无规则和谐波之间转变;斜拉索振动实测小波包能量占比呈现出季节性变化规律,不同频带能量占比的日变化表现出“昼大夜小”的趋势;特定频带的小波包能量占比随时间的变化可以较好地反映斜拉索短时振动能量的变化,有助于有效识别斜拉索振动情况,保证桥梁安全运营。

关键词：跨海大桥斜拉索实测数据振动响应时域特征频域特征小波包分析

Simulation of GaN micro-structured neutron detectors for improving electrical properties

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Chinese Physics B 2020年第2期29卷 414-419页

作者： Xin-Lei Geng Xiao-Chuan Xia Huo-Lin Huang zhong-hao sun He-Qiu Zhang Xing-Zhu Cui Xiao-Hua Liang Hong-Wei Liang School of Microelectronics Dalian University of TechnologyDalian 116024China School of Optoelectronic Engineering and Instrumentation Science Dalian University of TechnologyDalian 116024China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China

Nowadays,the superior detection performance of semiconductor neutron detectors is a challenging *** this paper,we deal with a novel GaN micro-structured neutron detector(GaN-MSND)and compare three different methods such as the method of modulating the trench depth,the method of introducing dielectric layer and p-type inversion region to improve the width of depletion region(W).It is observed that the intensity of electric field can be modulated by scaling the trench *** the other hand,the electron blocking region is formed in the detector enveloped with a dielectric ***,the introducing of p-type inversion region produces new p/n junction,which not only promotes the further expansion of the depletion region but also reduces the intensity of electric field produced by main *** can be realized that all these methods can considerably enhance the working voltage as well as *** them,the improvement on W of GaN-MSND with the p-type inversion region is the most significant and the value of W could reach 12.8μm when the carrier concentration of p-type inversion region is 10^17 cm^-***,the value of W is observed to improve 200%for the designed GaN-MSND as compared with that without additional *** work ensures to the researchers and scientific community the fabrication of GaN-MSND having superior detection limit in the field of intense radiation.

关键词： GaN micro-structured neutron detector depletion region electric field

Ultralight and superelastic MXene/reduced graphene oxide aerogels for electromagnetic interference shielding

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Nano Research 2025年第1期18卷 1-9页

作者： Xinfeng Zhou Yang Dai Guoyao Yue Yiman Zhang Lulu Li zhong-Zhen Yu Peng Min hao-Bin Zhang 21 State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Present address:BOE Technology Innovation Center BOE Technology Group Co.Ltd.Beijing 100176China Xi’an Modern Chemistry Research Institute Xi’an 710065China

Lightweight aerogels feature multifunctionality and a high porosity,yet accompanied with poor structure recovery under large strain *** this work,we develop an air bubble-ice crystal dual template and annealing strategy to integrate low density and high resilience for the conductive transition metal carbides/nitrides(MXene)composite *** air bubbles and ice crystals synergistically exclude the nanosheets to the gas-liquid interfaces,thereby constructing unique Y-shaped junctions and robust *** annealing process greatly enhances the interlayer *** external load,the Yshaped structures prevent the stress concentration at the junctions by transferring the forces to the skeleton for maintaining structural *** addition,the wrinkled and thick cell walls,together with the enhanced interlayer interactions,endow the aerogel with exceptional structural stability and *** a result,the MXene/reduced graphene oxide(RGO)composite aerogels exhibit superelasticity with reversible compressive strains of up to 95%.In addition,the electron bridging effect of the RGO sheets affords the aerogel to deliver excellent electromagnetic interference shielding performance,as high as 46.3 dB at 2.5 ***,the remarkable reshapeability of the aerogels allows for precise regulation of structure and performance(33.5-75.1 dB)by a simple wetting compression *** summary,this work offers helpful inspirations for developing lightweight and superelasticity aerogels for extensive applications.

关键词： lightweight superelasticity MXene aerogel electromagnetic interference shielding reshapeability

Hemoglobin integrated red blood cell membrane-coated metalorganic framework nano-platform for improving the self-adaptive blood glucose management

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Nano Research 2025年第1期18卷 618-627页

作者： Shuai Wu Li Zhu Sheng Ni Xiong Zhao Meng Yan Yuan zhong Karissa Kusuma Yi Liang Kaiwen Bao Kai Qu Xian Qin Kun Zhang Wuquan Deng Da sun Wei Wu Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqing 400044China Chongqing University Three Gorges Hospital Chongqing Municipality Clinical Research Center for Endocrinology and Metabolic DiseasesChongqing 404000China Institute of Life Sciences&Biomedical Collaborative Innovation Center of Zhejiang Province Wenzhou UniversityWenzhou 325035China Department of Endocrinology School of MedicineChongqing Emergency Medical CenterChongqing University Central HospitalChongqing 400014China

Diabetes,a prevalent chronic metabolic disorder,often leads to severe ***,existing treatment methods may pose life-threatening risks due to poor patient compliance and inaccurate dosing of subcutaneous insulin ***,a biomimetic red blood cell(RBC)membrane-coated glucose-responsive nanoplatform is developed for controlling insulin *** nanoplatforms with RBC membrane can prolong the half-life of nano-formulation in vivo mediated by the biomimetic immune ***,the cascade catalytic effect of glucose oxidase(GOx)encapsulated in metal-organic frameworks(MOFs)and hemoglobin(Hb)in the RBC membrane are able to not only facilitate glucose-responsive insulin release,but also eliminate the detrimental by-product hydrogen peroxide(H_(2)O_(2))resulting from the Hb mediated H_(2)O_(2)*** in vitro and in vivo studies have demonstrated the favorable glucose-responsive performances of this advanced nano-platform with a single intravenous injection maintaining blood glucose balance in Type 1 Diabetes(T1D)mice for an extended duration without the hypoglycemia ***,this biomimetic insulin delivery system is poised to function as a strategy for the intravenous insulin administration,offering a promising drug candidate for the self-adaptive long-term T1D treatment.

关键词： glucose-responsive metal-organic frameworks red blood cell membrane insulin delivery glucose oxidase hemoglobin

Microstructure and Mechanical Properties of Wire + Arc Additively Manufactured 2050 Al–Li Alloy Wall Deposits

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Chinese Journal of Mechanical Engineering 2019年第6期32卷 174-180页

作者： hao zhong Bojin Qi Baoqiang Cong Zewu Qi Hongye sun School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China MIIT Key Laboratory of Aeronautics Intelligent Manufacturing Beijing 100191China

Aluminum–Lithium(Al–Li) alloy is a topic of great interest owing to its high strength and light weight, but there are only a few applications of Al–Li alloy in wire ss, a special AA2050 Al–Li alloy + arc additive manufacturing(WAAM) process. To identify its feasibility in WAAM procewire was produced and employed in the production of straight-walled components, using a WAAM system based on variable polarity gas tungsten arc welding(VP-GTAW) process. The influence of post-deposited heat treatment on the microstructure and property of the deposit was investigated using optical micrographs(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD), hardness and tensile properties tests. Results revealed that the microstructures of AA2050 aluminum deposits varied with their location layers. The upper layers consisted of fine equiaxed grains, while the bottom layer exhibited a coarse columnar structure. Mechanical properties witnessed a significant improvement after post-deposited heat treatment, with the average micro-hardness reaching 141 HV and the ultimate tensile strength exceeding 400 MPa. Fracture morphology exhibited a typical ductile fracture.

关键词： Aluminum-copper-lithium alloy Wire arc additive manufacturing Heat treatment Mechanical properties

Fermi Blazars in the Zwicky Transient Facility Survey:Properties of Large Optical Variations

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Research in Astronomy and Astrophysics 2024年第10期24卷 104-115页

作者： Si-Si sun zhong-Xiang Wang Shun-hao Ji Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

We analyze the optical light curve data,obtained with the Zwicky Transient Facility(ZTF)survey,for 47 γ-ray blazars monitored by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope(Fermi).These 47sources are selected because they are among the Fermi blazars with the largest optical variations in the ZTF *** color-magnitude variation patterns are seen in them,with one being redder-to-stable-when-brighter(RSWB;in 31 sources)and the other being stable when brighter(in 16 sources).The patterns fit with the results recently reported in several similar studies with different ***,we find that the colors in the stable state of the sources share similar values,for which(after being corrected for the Galactic extinction)most sources are in a range of 0.4–*** feature could be intrinsic and may be applied in,for example,study of the intragalactic *** also determine the turning points for the sources showing the RSWB pattern,after which the color changes saturate and become *** find a correlation between optical fluxes and γ-ray fluxes at the turning *** physical implications of the correlation remain to be investigated,probably better with a sample of high-qualityγ-ray flux measurements.

关键词： (galaxies:)BL Lacertae objects:general (galaxies:)quasars:general gamma-rays:galaxies

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

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Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng Yang Song Xie Zi-Meng Han hao-Cheng Liu Chong-Han Yin Wen-Bin sun Zhang-Chi Ling Huai-Bin Yang De-Han Li Qing-Fang Guan Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

Proactive planning of bandwidth resource using simulation-based what-if predictions for Web services in the cloud

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Frontiers of Computer Science 2021年第1期15卷 25-52页

作者： Jianpeng HU Linpeng HUANG Tianqi sun Ying FAN Wenqiang HU hao zhong Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Electronic and Electrical Engineering Shanghai University of Engineering ScienceShanghai 201620China

Resource planning is becoming an increasingly important and timely problem for cloud *** more Web services are moved to the cloud,minimizing network usage is often a key driver of cost *** existing approaches focus on resources such as CPU,memory,and disk I/*** particular,CPU receives the most attention from researchers,but the bandwidth is somehow *** is challenging to predict the network throughput of modem Web services,due to the factors of diverse and complex response,evolving Web services,and complex network *** this paper,we propose a methodology of what-if analysis,named Log2Sim,to plan the bandwidth resource of Web ***2Sim uses a lightweight workload model to describe user behavior,an automated mining approach to obtain characteristics of workloads and responses from massive Web logs,and traffic-aware simulations to predict the impact on the bandwidth consumption and the response time in changing *** use a real-life Web system and a classic benchmark to evaluate Log2Sim in multiple *** evaluation result shows that Log2Sim has good performance in the prediction of bandwidth *** average relative error is 2%for the benchmark and 8% for the real-life *** for the response time,Log2Sim cannot produce accurate predictions for every single service request,but the simulation results always show similar trends on average response time with the increase of workloads in different changing *** can provide sufficient information for the system administrator in proactive bandwidth planning.

关键词： what-if analysis bandwidth management network simulation Web service log mining resource planning evolution OPNET

Metal coordination assists fabrication of multifunctional aerogel

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Journal of Materials Science & Technology 2021年第12期71卷 67-74页

作者： Yijie Hu hao Zhuo Zehong Chen Xinwen Peng Linxin zhong Runcang sun State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Centre for Lignocellulose Science and Engineering College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

Interfacial design is one of the most promising ways in improving mechanical properties of *** this work,a multifunctional aerogel with excellent mechanical performances,sensing sensitivity,and fire retardancy is fabricated by taking advantage of metal coordination between biopolymer and Fe3+.Montmorillonite(MMT)nanosheets are added to induce a‘brick and mortar’*** coordination remarkably reduces structural defects,leading to well-formed lamellas that can effectively distribute stress under sever compression without plastic *** structural merits impart the aerogel highly reversible compressibility even at 99%strain and superior ***,it demonstrates high sensing performance in wearable health monitoring devices,and shows fire resistance property that can maintain elasticity in a *** work offers a facile and effective method to create multifunctional aerogels from various polymers.

关键词： Foam Composites Resilient Carbon