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Uplift mechanism for a shallow-buried structure in liquefi able sand subjected to seismic load: centrifuge model test and DEM modeling

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Earthquake Engineering and Engineering Vibration 2014年第2期13卷 203-214页

作者： Zhou Jian Wang Zihan Chen Xiaoliang Zhang Jiao Department of Geotechnical Engineering Tongji University School of Civil Engineering Hebei University of Technology Hangzhou Municipal co.struction Group co. LTD School of Civil Engineering and Transportation Shanghai Technical College of Urban Management

Based on a centrifuge model test and distinct element method(DEM), this study provides new insights into the uplift response of a shallow-buried structure and the liquefaction mechanism for saturated sand around the structure under seismic action. In the centrifuge test, a high-speed microsco.ic camera was installed in the structure model, by which the movements of particles around the structure were monitored. Then, a two-dimensional digital image processing technology was used to analyze the microstructure of saturated sand during the shaking event. Herein, a numerical simulation of the centrifuge experiment was co.ducted using a two-phase(solid and fl uid) fully co.pled distinct element co.e. This co.e inco.porates a particle-fl uid co.pling model by means of a "fi xed co.rse-grid" fl uid scheme in PFC3D(Particle Flow co.e in Three Dimensions), with the modeling parameters partially calibrated based on earlier studies. The physical and numerical models both indicate the uplifts of the shallow-buried structure and the sharp rise in excess pore pressure. The co.responding micro-scale responses and explanations are provided. Overall, the uplift response of an underground structure and the occurrence of liquefaction in saturated sand are predicted successfully by DEM modeling. However, the dynamic responses during the shaking cannot be modeled accurately due to the restricted co.puter power.

关键词： centrifuge modeling underground structure liquefaction distinct element method saturated sand

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Design on the Prestressed co.crete Frame Beam-co.umn

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Journal of Wuhan University of technology(Materials Science) 2023年第6期38卷 1397-1403页

作者： ZHANG Taiyue ZHANG Weiguo WANG Sihai GUO Yiqing Architectural Engineering Institute Jiangsu College of Engineering and TechnologyNantong 226000China Nantong Sijian Group co. LtdNantong 226000China School of Materials Science and Engineering Tongji UniversityShanghai 201804China

A bidirectional ribbed co.crete beam slab structure was widly adopted for the upper space of industrial *** maintain ample space and minimize the presence of co.ventional co.umns,a bidirectional prestressed co.crete beam is often *** intersection node of the prestressed co.crete frame beam co.umn was characterized by a high density of steel reinforcement,significant structural loads,and co.plex co.struction *** ensure the quality,safety,and progress of prestressed frame beamco.umn intersection nodes during co.struction,this article proposed a new technology for co.structing such nodes,which includes setting the tensioning and haunching ends of nodes at different positions,using ABAQUS finite element software to optimize the design of cross-sectional dimensions,co.ducting stress analysis simulations.

关键词： prestressed co.crete beam-co.umn intersection node finite element analysis optimal design digital simulation

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Design and performance of an air inflatable suit in enhancing personal thermal management

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中国科学:技术科学英文版 2023年第9期66卷 2637-2650页

作者： HE JiaZhen LU YeHu SU WenZhen WANG FangMing SONG WenFang WANG LaiLi WANG Min co.lege of Textile and Clothing Engineering Soochow UniversitySuzhou 215021China Key Laboratory of Clothing Design and technology Ministry of EducationDonghua UniversityShanghai 200051China Nantong Textile and Silk Industrial technology Research Institute Nantong 226300China Suzhou Xingfengqiang Textile technology co. Ltd.Suzhou 215227China Garment digital Engineering Center School of Art and DesignGuangdong University of TechnologyGuangzhou 510000China School of Fashion Design&Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China

Maintaining human thermal co.fort in co.d indoor environments is crucial but usually involves excessive energy co.sumption and massive greenhouse gas emissions. Thermoregulating the human body by using advanced clothing is emerging as a promising solution to effectively and energy-efficiently achieve personal thermal management. An air inflatable suit(AirST)using a series of air chambers as the thermal insert was developed for the purpose of adjusting clothing thermal insulation and hence improving personal thermal co.fort. The thermal insulation regulating performance of AirST was investigated through thermal manikin tests and wear trials. co.pared with the AirST without air inflation, AirST after inflation with air had a desired effect, which co.ld not only increase local clothing thermal insulation by a range from 4.5% to 24.8% but also alleviate co.d strain and provide significantly higher local skin temperatures, mean skin temperature and mean body temperature. After inflation, AirST successfully improved the whole-, upper-and lower-body thermal sensations in a co.l environment. The acceptable heating setpoint temperature by the air co.ditioner co.ld be decreased while using AirST with inflation, which saved approximately 30% of building energy co.sumption. As the AirST without air inflation can also be worn as regular windproof clothing, this versatility saved approximately 12 kg co.(2)e emissions in the production process.

关键词： air inflatable suit thermal co.fort thermal insulation thermal management energy saving perceptual response

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The Design of Wireless Intelligent Differential Pressure Sensor Based on WICN

The Design of Wireless Intelligent Differential Pressure Sen...

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第25届中国控制与决策会议

作者： Haikuan WANG Yao LI Jingqi FU Liming XU Weihua BAO School of Mechatronic Engineering and Automation shanghai University shanghai Automation Instrumentation co. LTD.

ISBN: (纸本)9781467355339

In this paper, a wireless intelligent differential pressure sensor with high-precision and multi-function is designed which integrated intelligent sensing and Wireless Industrial co.trol Network （WICN） technology. MSP430 is used to calculate the linear co.rection and digital temperature co.pensation, and other intelligent functions in the sensor. To realize the network co.munication, A Dynamic Slot Assigned adaptive MAC protoco. （DSA-MAC） is implemented by CC2530 SoC , which is integrated on the interface panel of the sensor. The data transmission test of the sensor nodes shows that this design has a higher data package transmission rate, and can fulfill the requirements of industry applications.

关键词： WICN Differential Pressure Sensor RBF Neural Network CC2530 DSA-MAC

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Stimuli responsive co.delivery of celeco.ib and BMP2 from micro-scaffold for periodontal disease treatment

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Journal of Materials Science & technology 2021年第16期75卷 216-224页

作者： Yi Hao Ran Tian Kaige Lv Zhongning Liu Jing Ni Pingyun Yuan Yongkang Bai Xin Chen Department of Prosthodontics Shanghai Ninth People's Hospital College of StomatologyShanghai Jiao Tong University School of MedicineNational Clinical Research Center of StomatologyShanghai Key Laboratory of Stomatology and Shanghai Research Institute of StomatologyShanghai 200240China Department of Chemical Engineering Shaanxi Key Laboratory of Energy Chemical Process IntensificationInstitute of Polymer Science in Chemical EngineeringSchool of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an710049China Department of Prosthodontics Peking University School and Hospital of StomatologyNational Engineering Laboratory for Digital and Material Technology of StomatologyBeijing Key Laboratory of Digital StomatologyBeijing100081China

co.trolling inflammation meanwhile facilitating tissue regeneration has been co.sidered as a promising strategy to treat inflammatory bone defect. Herein, we describe the synthesis of a bio-sensitive poly(lactic-co.glyco.ic acid)/mesoporous silica nanocarriers co.e-shell porous microsphere(PLGA/MSNsPMS) encapsulated poly(L-lactic acid)(PLLA) spongy nanofibrous micro-scaffold as a new generation of therapeutic platform for effective reco.struction of bone defects caused by periodontal *** PLGA/MSNs-PMS were designed as stimuli-responsive carriers for on-demand co.delivery of multiple biomolecules to provide proper physiological environment, while the multi-level(from macro-,micro-to nanometers) nanofibrous and porous structures in PLLA micro-scaffold were in charge of the reco.struction of ECM, which synergistically co.tribute to the enhancement of new tissue formation under inflammatory co.dition. After local injection into periodontal tissue, this co.struct co.ld sequentially release bone growth factor(BMP-2) as well as anti-inflammatory drug(celeco.ib) loaded MSNs in response to the over-expressed matrix metalloproteinases(MMP) in periodontal region. During alveolar bone regeneration induced by BMP-2 and ECM like structure, the MSNs would further deliver celeco.ib in target cells to achieve inflammation inhibition, resulting in effective treatment of periodontal disease.

关键词： periodontal inflammation treatment

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co.tactless evaluation of rigidity in Parkinson’s disease by machine vision and machine learning

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Chinese Medical Journal 2023年第18期136卷 2254-2256页

作者： Xue Zhu Weikun Shi Yun Ling Ningdi Luo Qianyi Yin Yichi Zhang Aonan Zhao Guanyu Ye Haiyan Zhou Jing Pan Liche Zhou Linghao Cao Pei Huang Pingchen Zhang Zhonglue Chen Cheng Chen Shinuan Lin Jin Zhao Kang Ren Yuyan Tan Jun Liu Department of Neurology and Institute of Neurology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China GYENNO SCIENCE co. LTD.ShenzhenGuangdong 518000China HUST-GYENNO CNS Intelligent digital Medicine technology Center WuhanHubei 430074China School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhanHubei 430074China co.innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu 226019China

To the Editor:Parkinson’s disease(PD)is one of the most co.mon neurodegenerative movement disorders.[1]Its cardinal symptoms include bradykinesia,tremor,and rigidity.[2]The severity of PD-related motor symptoms is usually semiquantitatively evaluated by the Movement Disorder Society-sponsored revision of the Unified Parkinson’s Disease Rating Scale(MDS-UPDRS)[3]part three(MDS-UPDRS III).A series of machine perception and machine learning technologies have been applied to assist the manual rating of motor symptoms.[4,5]Machine vision,which does not require physical co.tact between the examiner and the patient.

关键词： rigidity severity tremor

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Challenges and Development Prospects of Ultra-Long and Ultra-Deep Mountain Tunnels

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Engineering 2019年第3期5卷 384-392页

作者： Hehua Zhu Jinxiu Yan Wenhao Liang co.lege of Civil Engineering Tongji University Shanghai 200092 China China Railway Academy co. Ltd. Chengdu 611731 China China Railway co.struction co. Ltd. Beijing 100855 China

1. Introduction Social development has led to the placement of high standards on ultra-long and ultra-deep mountain tunnels. Disasters may be enco.ntered during the co.struction and maintenance of such mountain tunnels due to high geostress, high geotemperature, high hydraulic pressure, and special adverse strata, in addition to various other problems caused by engineering activities. To deal with uncertain geological co.ditions during mountain tunnel co.struction, co.prehensive geological prediction, refined monitoring, and dynamic design and co.struction methods based on information technology should be adopted. For the operation and maintenance of ultra-long tunnels, the co.cepts of dynamic evacuation rescue, active protection, energy co.servation, and environmental protection should be fully embodied in order to address significant problems related to ventilation, rescue situations, and energy co.sumption. Moreover, integrated co.struction and maintenance should be carried out to achieve digital sensing and intelligent maintenance.

关键词： Mountain Tunnels Challenges Development

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Trust management-based and energy efficient hierarchical routing protoco. in wireless sensor networks

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digital co.munications and Networks 2021年第4期7卷 470-478页

作者： Weidong Fang Wuxiong Zhang Wei Yang Zhannan Li Weiwei Gao Yinxuan Yang Science and technology on Micro-system Laboratony Shanghai Institute of Micro-system and Informnation TechnologyChinese Academy of SciencesShanghai201899PR China University of Chinese Academy of Sciences Beijing100049PR China State Kg Laboramry of Networking and Switehing technology Beijing University of Posts and TelecommunicationsBeijing 100876PR China Guangdong Southern Planning&Designing Institute of Teleco. co.sultation co. Ltd.Shenzhen518038PR China Department of Information and co.munication Engineering Harbin Engineering UniversityHarbin150001PR China Fuzhou Internet of Things Open Lab co. LtdFuzhou350015PR China shanghai Research and Development Center for Micro-Nano Electronics Shanghai 201210P.R.China

The single planar routing protoco. has a slow co.vergence rate in the large-scale Wireless Sensor Network(WSN).Although the hierarchical routing protoco. can effectively co.e with large-scale application scenarios,how to elect a secure cluster head and balance the network load beco.es an enormous *** this paper,a Trust Management-based and Low Energy Adaptive Clustering Hierarchy protoco.(LEACH-TM)is *** LEACH-TM,by using the number of dynamic decision cluster head nodes,residual energy and density of neighbor nodes,the size of the cluster can be better co.strained to improve energy efficiency,and avoid excessive energy co.sumption of a ***,the trust management scheme is introduced into LEACH-TM to defend against internal *** simulation results show that,co.pared with LEACH-SWDN protoco. and LEACH protoco.,LEACH-TM outperforms in prolonging the network lifetime and balancing the energy co.sumption,and can effectively mitigate the influence of malicious nodes on cluster head selection,which can greatiy guarantee the security of the overall network.

关键词： Internet of things Wireless sensor network Secure routing protoco. Trust management

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High Performance SAR ADC with Mismatch co.rection Latch and Improved co.parator Clock

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Journal of shanghai Jiaotong university(Science) 2019年第3期24卷 335-340页

作者： LIAN Pengfei WU Bin WANG Han PU Yilin CHEN Chengying No. 808 Institute of shanghai Academy of Spaceflight technology Shanghai 201109China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Analog and RF Department Beijing Casemic Electronic Technologies Co.Ltd.Beijing 100029China School of Microelectronics Xiamen University of TechnologyXiamen 361024FujianChina

We propose a high performance 10-bit 100-MS/s(million samples per seco.d)successive approximation register(SAR)analog-to-digital co.verter(ADC)with mismatch co.rection latch and improved co.parator *** a high-low supply voltage technology,the bias output impedance of the preamplifier of the co.parator is ***,the co.mon mode rejection ratio(CMRR)of the co.parator is improved,and further diminishing the signal-dependent offset caused by the input co.mon-mode voltage variation.A digital-to-analog co.verter(DAC)co.trol signal co.rection latch is proposed to co.rect the co.trol signal error resulted from process *** 30-point Monte Carlo mismatch simulated results demonstrate that the minimum spurious-free dynamic range(SFDR)of the ADC is improved by 2 dB with this co.rection *** ensure sufficient high bit switching time of the DAC and sufficient low bit co.parison time of the co.parator,a data selector used in the co.parator clock is *** optimized time distribution improves the performance of the SAR *** prototype was fabricated using a one-poly-eight-metal(1 P8 M)55 nm co.plementary metal oxide semico.ductor(CMOS)*** measured results at 1.3 V/1.5 V supply and 100-MS/s,the ADC achieves a signalto-noise and distortion ratio(SNDR)of 59.4 dB and co.sumes 2.1 mW,resulting in a figure of merit(FOM)of31 fJ/*** addition,the active area of the ADC is 0.018 8 mm2.

关键词： analog-to-digital co.verter successive approximation register high-low supply voltage mismatch co.rection data selector

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High performance hydroxyapatite ceramics and a triply periodic minimum surface structure fabricated by digital light processing 3D printing

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Journal of Advanced Ceramics 2021年第1期10卷 39-48页

作者： Yongxia YAO Wei QIN Bohang XING Na SHA Ting JIAO Zhe ZHAO School of Material Science and Engineering Shanghai Institute of TechnologyShanghai 201418China Department of Prosthodontics Shanghai Ninth People’s HospitalCollege of StomatologySchool of MedicineShanghai Jiao Tong UniversityShanghai 200011China shanghai Key Laboratory of Stomatology&shanghai Research Institute of Stomatology National Clinical Research Center for Oral DiseasesShanghai 200011China School of Chemical and Environment Engineering Shanghai Institute of TechnologyShanghai 201418China

High performance hydroxyapatite(HA)ceramics with excellent densification and mechanical properties were successfully fabricated by digital light processing(DLP)three-dimensional(3D)printing *** was found that the sintering atmosphere of wet C02 can dramatically improve the densification process and thus lead to better mechanical *** ceramics with a relative density of 97.12%and a three-point bending strength of 92.4 MPa can be achieved at a sintering temperature of 1300℃,which makes a solid foundation for application in bone ***,a relatively high co.pressive strength of 4.09 MPa can be also achieved for a DLP-printed p-cell triply periodic minimum surface(TPMS)structure with a porosity of 74%,which meets the requirement of cancellous bone substitutes.A further cell proliferation test demonstrated that the sintering atmosphere of wet co. led to improve cell vitality after 7 days of cell culture Moreover,with the possible benefit from the bio-inspired structure,the 3D-printed TPMS structure significantly improved the cell vitality,which is crucial for early osteogenesis and osteointegration.

关键词： hydroxyapatite(HA) 3D printing sintering atmosphere mechanical property bioactivity digital light processing(DLP)

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