检索结果-南通市图书馆

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

基于墩柱增设的独柱墩曲线箱梁桥抗倾覆研究

交通科学与工程 2024年第4期40卷 85-92页

作者：吕毅刚王翠饶攀韩伟威李星乔杰长沙理工大学土木工程学院湖南长沙410114 长沙理工大学交通运输工程学院湖南长沙410114 长沙理工大学桥梁结构安全控制湖南省工程实验室湖南长沙410114 远东幕墙(珠海)有限公司广东珠海519090

近年来,独柱墩曲线箱梁桥整体侧翻倾覆事故时有发生,开展抗倾覆分析及加固对策的研究具有重要的工程价值。以某匝道桥为工程背景,考虑其抗倾覆稳定性,使用支座失效法并结合有限元分析软件Midas/Civil建立柔性梁格有限元模型,对独柱墩曲... 详细信息

近年来,独柱墩曲线箱梁桥整体侧翻倾覆事故时有发生,开展抗倾覆分析及加固对策的研究具有重要的工程价值。以某匝道桥为工程背景,考虑其抗倾覆稳定性,使用支座失效法并结合有限元分析软件Midas/Civil建立柔性梁格有限元模型,对独柱墩曲线箱梁桥加固前后的抗倾覆稳定性和动力特性进行了对比分析。研究结果表明:加固前该桥曲线箱梁的一阶振型为扭转振动,在4号墩处,易发生扭转,可能导致支座脱空,此时该桥抗倾覆稳定系数最小为1.97,不满足规范中抗倾覆稳定系数不小于2.50的要求。采用墩柱增设法对4号墩进行加固后,该桥曲线箱梁的一阶振型为纵向弯曲振动,抗倾覆稳定系数最小为4.31,抗倾覆能力得到显著提升。通过现场抗倾覆稳定性静载试验,对加固效果进行了实桥验证,效果较好。

关键词：独柱墩曲线箱梁桥墩柱增设法抗倾覆稳定系数

Numerical simulation of sediment transport in coastal waves and wave-induced currents

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2016年第9期35卷 111-116页

作者： TANG Jun lyu yigang SHEN Yongming State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116023China Jiaxing City Traffic Engineering Quality and Safety Surveillance liaxing 314001China

Prediction of coastal sediment transport is of particularly importance for analyzing coast erosion accurately and solving the corresponding coast protection engineering *** present study provided a numerical scheme for sediment transport in coastal waves and wave-induced *** the scheme,the sand transport model was implemented with wave refraction-diffraction model and near-shore current *** water wave was simulated by using the parabolic mild-slope equation in which wave refraction,diffraction and breaking effects are ***-induced current was simulated by using the nonlinear shallow water equations in which wave provides radiation stresses for driving ***,sediment transport in waves and wave-induced currents was simulated by using the two-dimensional suspended sediment transport equations for suspended sediment and the bed-load transport equation for bed *** numerical scheme was validated by experiment results from the Large-scale Sediment Transport Facility at the US Army Corps of Engineer Research and Development Center in *** numerical results showed that the present scheme is an effective tool for modeling coastal sediment transport in waves and near-shore currents.

关键词： numerical modeling coastal wave wave-induced current sediment transport suspended sediment bed-load

Numerical study on water waves and wave-induced longshore currents in Obaky coastal water

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2014年第9期33卷 40-46页

作者： TANG Jun lyu yigang SHEN Yongming State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

In this paper, the water waves and wave-induced longshore currents in Obak6y coastal water which is located at the Mediterranean coast of Turkey were numerically studied. The numerical model is based on the parabolic mild-slope equation for coastal water waves and the nonlinear shallow water equation for the wave-induced currents. The wave transformation under the effects of shoaling, refraction, diffraction and breaking is considered, and the wave provides radiation stresses for driving currents in the model. The numerical results for the water wave-induced longshore currents were validated by the measured data to demonstrate the efficiency of the numerical model. Then the water waves and longshore currents induced by the waves from main directions were numerically simulated and analyzed based on the numerical results. The numerical results show that the movement of the longshore currents was different while the wave proDaRated to a coastal zone from different directions.

关键词： coast hydrodynamics water wave mild-slope equation wave-induced currents numerical modeling

Stability of the Stratification of Water Bodies in the North Passage of the Yangtze River Estuary Based on the EFDC Model

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第1期23卷 23-32页

作者： WU De’an LI Xin WANG yigang College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Tianjin Research Institute For Water Transport Engineering Tianjin 300456China

To study the stratified stability of a water column in the North Passage of the Yangtze River Estuary,a numerical model of the hydrodynamics of this estuary is established using the EFDC *** the basis of EFDC results,this paper derives and pro-vides the discriminative index of water body stability caused by salinity and analyzes the along-range variation in water body strati-fication stability in the North Passage of the Yangtze River Estuary and the periodic variation at a key location(bend area)based on the simulation results of the numerical *** work shows that the water body in the bend area varies between mixed and strati-fied types,and the vertical average flow velocity has a good negative correlation with the differential velocity between the surface and bottom layers of the water *** model simulation results validate the formulae for the stratified stability discriminant during spring tides.

关键词： Yangtze Estuary North Passage EFDC model stratification stability salinity distribution

A Normalizing Flow-Based Bidirectional Mapping Residual Network for Unsupervised Defect Detection

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第2期78卷 1631-1648页

作者： Lanyao Zhang Shichao Kan yigang Cen Xiaoling Chen Linna Zhang Yansen Huang School of Mechanical Engineering Guizhou UniversityGuiyang550025China School of Computer Science and Engineering Central South UniversityChangsha410083China School of Computer and Information Technology Beijing Jiaotong UniversityBeijing100044China College of Civil Engineering Guizhou UniversityGuiyang550025China Guizhou Lianjian Civil Engineering Quality Inspection Monitoring Center Co. Ltd.Guiyang550025China

Unsupervised methods based on density representation have shown their abilities in anomaly detection,but detection performance still needs to be ***,approaches using normalizing flows can accurately evaluate sample distributions,mapping normal features to the normal distribution and anomalous features outside ***,this paper proposes a Normalizing Flow-based Bidirectional Mapping Residual Network(NF-BMR).It utilizes pre-trained Convolutional Neural Networks(CNN)and normalizing flows to construct discriminative source and target domain feature ***,to better learn feature information in both domain spaces,we propose the Bidirectional Mapping Residual Network(BMR),which maps sample features to these two spaces for anomaly *** two detection spaces effectively complement each other’s deficiencies and provide a comprehensive feature evaluation from two perspectives,which leads to the improvement of detection *** experimental results on the MVTec AD and DAGM datasets against the Bidirectional Pre-trained Feature Mapping Network(B-PFM)and other state-of-the-art methods demonstrate that the proposed approach achieves superior *** the MVTec AD dataset,NF-BMR achieves an average AUROC of 98.7%for all 15 ***,it achieves 100%optimal detection performance in five *** the DAGM dataset,the average AUROC across ten categories is 98.7%,which is very close to supervised methods.

关键词： Anomaly detection normalizing flow source domain feature space target domain feature space bidirectional mapping residual network

Antibacterial mechanism of kojic acid and tea polyphenols against Escherichia coli O157:H7 through transcriptomic analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第2期13卷 736-747页

作者： Yilin Lin Ruifei Wang Xiaoqing Li Keren Agyekumwaa Addo Meimei Fang Yehui Zhang yigang Yu School of Food Sciences and Engineering South China University of TechnologyGuangzhou 510640China Sericulture&Agri-food Research Institute Guangdong Academy of Agricultural Sciences Key Laboratory of Functional FoodsMinistry of Agriculture and Rural AffairsGuangdong Key Laboratory of Agricultural Products ProcessingGuangzhou 510610China Research Center of Food Safety and Detection College of Food Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

Escherichia coli O157:H7 is one of the major foodborne pathogenic bacterial that cause infectious diseases in *** previous found that a combination of kojic acid and tea polyphenols exhibited better activity against *** O157:H7 than using either *** study aimed to explore responses underlying the antibacterial mechanisms of kojic acid and tea polyphenols from the gene *** functional enrichment analysis by comparing kojic acid and tea polyphenols individually or synergistically against *** O157:H7 found that acid resistance systems in kojic acid were activated,and the cell membrane and genomic DNA were destructed in the cells,resulting in“oxygen starvation”.The oxidative stress response triggered by tea polyphenols inhibited both sulfur uptake and the synthesis of ATP,which affected the bacteria's life metabolic ***,we found that kojic acid combined with tea polyphenols hindered the uptake of iron that played an essential role in the synthesis of DNA,respiration,tricarboxylic acid *** results suggested that the iron uptake pathways may represent a novel approach for kojic acid and tea polyphenols synergistically against *** O157:H7 and provided a theoretical basis for bacterial pathogen control in the food industry.

关键词： Kojic acid Tea polyphenols Antibacterial mechanism Escherichia coli O157:H7 RNA-seq

Synthesis of Organic-Inorganic Hybrid Aluminum Hypophosphite Microspheres Flame Retardant and Its Flame Retardant Research on Thermoplastic Polyurethane

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 221-233页

作者：刘生鹏 XU Zhi ZHANG Xinyuan WEI Huan XIONG Yun DING yigang HUANG Wenbo 许莉莉 Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Key Laboratory for Green Chemical Process of Ministry of EducationSchool of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430205China Hubei Three Gorges Laboratory Yichang 443007China School of Technology Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China

Aluminum hypophosphite microspheres(AHP) were synthesized by hydrothermal method using NaH2PO2·H2O and AlCl3·6H2O as raw materials, and then the AHP microspheres were polymerized by surface polymerization of micro-nanospheres with cyclic cross-linked poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol)(PZS). A new organic-inorganic poly(phosphonitrile)-modified aluminum hypophosphite microspheres(PZS-AHP) were synthesized by encapsulation and applied to flame retardant thermoplastic polyurethane(TPU). The microstructure and chemical composition of the PZS-AHP microsphere were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray spectroscopy. The thermal stability of PZS-AHP microsphere was explored with thermogravimetric analysis. Thermogravimetric data indicate that the PZS-AHP microspheres have excellent thermal stability. The thermal and flame-retarding properties of the TPU composites were evaluated by thermogravimetric(TG), limited oxygen index tests(LOI), and cone calorimeter test(CCT). The TPU composite achieved vertical burning(UL-94) V-0 grade and LOI value reached 29.2% when 10 wt% PZS-AHP was incorporated. Compared with those of pure TPU, the peak heat release rate(pHRR) and total heat release(THR) of TPU/10%PZS-AHP decreased by 82.2% and 42.5%, respectively. The results of CCT indicated that PZS-AHP microsphere could improve the flame retardancy of TPU composites.

关键词： polyphosphazene thermoplastic polyurethane flame retardancy aluminum hypophosphite surface polymerization

Detection of ribophagy in yeast and mammals

在线全文

学校读者我要写书评

暂无评论

Biophysics Reports 2024年第2期10卷 82-101页

作者： Miao Ye Yuting Chen Zhaojie Liu yigang Wang Cong Yi Xinyuan Institute of Medicine and Biotechnology School of Life Sciences and Medicine Zhejiang Sci-Tech University Department of Biochemistry and Department of Hepatobiliary and Pancreatic Surgery of the First Affiliated Hospital Zhejiang University School of Medicine Guangzhou Municipal and Guangdong Provincial Key Laboratory of Protein Modification and Degradation Affiliated Cancer Hospital & Institute of Guangzhou Medical University School of Basic Medical Sciences Guangzhou Medical University

Ribophagy, the cellular process wherein ribosomes are selectively self-digested through autophagy,plays a pivotal role in maintaining ribosome turnover. Understanding the molecular regulatory mechanisms governing ribophagy is pivotal to uncover its significance. Consequently, the establishment of methods for detecting ribophagy becomes important. In this protocol, we have optimized, enriched,and advanced existing ribophagy detection techniques, including immunoblotting, fluorescence microscopy, and transmission electron microscopy(TEM), to precisely monitor and quantify ribophagic events. Particularly noteworthy is the introduction of TEM technology for yeast ribophagy detection. In summary, the delineated methods are applicable for detecting ribophagy in both yeast and mammals,laying a solid foundation for further exploring the physiological importance of ribophagy and its potential implications in diverse cellular environments.

关键词： Ribophagy Ribosome turnover Immunoblotting Fluorescence microscopy Transmission electron microscopy Yeast and mammals

A synergetic strategy of NIR-Ⅱ squaraine dyes with ultrahigh photothermal conversion efficiency for photothermal therapy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第2期67卷 612-621页

作者： yigang Wang Guomin Xia Junhui Wang Mingda Wang Weihan Guo Manman Tan Leilei Si Yang Yang Hua Wang Hongming Wang Institute for Advanced Study and School of Chemistry and Chemical Engineering Nanchang UniversityNanchang330031China State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China The Second Affiliated Hospital of Nanchang University Nanchang330031China

Recent research on photothermal therapy(PTT) has sparked significant interest in the development of new organic photothermal agents(PTAs),ranging from single-molecule to aggregated ***,controlling aggregation pathways for PTAs with ultrahigh photothermal conversion efficiency(PCE) remains a major ***,a two-pronged approach utilizing “Haggregation” and “intramolecular motion” was employed to enhance the PCE of an acceptor-substituted squaraine dye(NSQs).The C2vmolecular symmetry of the NSQs,which possess a ground state dipole moment(μg),promotes H-dimeric aggregates through dipole-dipole *** triphenylethylene or diphenylamine groups were added to this H-dimeric *** was done to enhance intramolecular motions for heat generation and also to extend conjugation,which redshifted the optical absorption and balanced the blue-shift induced by *** this technique,an organic PTA with NIR-II absorption was developed,and its nanoparticle achieved a remarkable PCE of 86.3% under 1,064 nm laser *** transient absorption spectroscopy and quantum mechanical calculations demonstrated the accelerated internal conversion process in NIR-II PTAs for rapid heat *** NSQs nanoparticles exhibit superior photothermal therapeutic properties for in vivo photoacoustic imaging-guided PTT,demonstrating the potential of bottom-up design to enable synergistic engineering strategies towards efficient phototheranostic agents.

关键词： squaraine dyes second near-infrared window H-aggregation intramolecular motion photothermal therapy