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Behavior and strength of headed stud shear connectors in ultra-high performance concrete of composite bridges

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Frontiers of Structural and Civil Engineering 2019年第5期13卷 1138-1149页

作者： Jianan QI yuqing hu Jingquan WANG Wenchao LI Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education School of Civil EngineeringSoutheast UniversityNanjing 211189China

This study presents an experimental and numerical investigation on the static behavior of headed stud shear connectors in ultra-high performance concrete (UHPC) of composite bridges. Four push-out specimens were tested. It was found that no cracking, crushing or splitting was observed on the concrete slab, indicating that UHPC slab exhibited good performance and could resist the high force transferred from the headed studs. The numerical and experimental results indicated that the shear capacity is supposed to be composed of two parts stud shank shear contribution and concrete wedge block shear contribution. The stiffness increment of a stud in UHPC was at least 60% higher than that in normal strength concrete. Even if the stud height was reduced from 6d to 2d, there was no reduction in the shear strength of a stud. Short stud shear connectors with an aspect ratio as small as 2 could develop full strength in UHPC slabs. An empirical load-slip equation taking into account stud diameter was proposed to predict the load-slip response of a stud. The reliability and accuracy of the proposed load-slip equation was verified by the experimental and numerical load-slip curves.

关键词： ultra-high performance concrete studs shear strength FE analysis push-out test

Flexural and longitudinal shear performance of precast lightweight steel-ultra-high performance concrete composite beam

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Frontiers of Structural and Civil Engineering 2023年第5期17卷 704-721页

作者： Ze MO Jiangrui QIU Hanbin XU Lanlan XU yuqing hu Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education School of Civil EngineeringSoutheast UniversityNanjing 211189China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China School of Civil Engineering Jiangsu Open UniversityNanjing 210036China

In this study,the flexural and longitudinal shear performances of two types of precast lightweight steel–ultra-high performance concrete(UHPC)composite beams are investigated,where a cluster UHPC slab(CUS)and a normal UHPC slab(NUS)are connected to a steel beam using headed studs through discontinuous shear pockets and full-length shear pockets,*** show that the longitudinal shear force of the CUS is greater than that of the NUS,whereas the interfacial slip of the former is *** to its better integrity,the CUS exhibits greater flexural stiffness and a higher ultimate bearing capacity than the *** further optimize the design parameters of the CUS,a parametric study is conducted to investigate their effects on the flexural and longitudinal shear *** square shear pocket is shown to be more applicable for the CUS,as the optimal spacing between two shear pockets is 650 ***,a design method for transverse reinforcement is proposed;the transverse reinforcement is used to withstand the splitting force caused by studs in the shear pocket and prevent the UHPC slab from *** to calculation results,the transverse reinforcement can be canceled when the compressive strength of UHPC is 150 MPa and the volume fraction of steel fiber exceeds 2.0%.

关键词： precast steel-UHPC composite beam flexural performance longitudinal shear performance parametric study transverse reinforcement ratio

Research on Restoration of Murals Based on Diffusion Model and Transformer

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Computers, Materials & Continua 2024年第9期80卷 4433-4449页

作者： Yaoyao Wang Mansheng Xiao yuqing hu Jin Yan Zeyu Zhu School of Computing Hunan University of TechnologyZhuzhou412000China School of Computing Hunan Software Vocational and Technical UniversityXiangtan411100China

Due to the limitations of a priori knowledge and convolution operation,the existing image restoration techniques cannot be directly applied to the cultural relics mural restoration,in order to more accurately restore the original appearance of the cultural relics mural images,an image restoration based on the denoising diffusion probability model(Denoising Diffusion Probability Model(DDPM))and the Transformer *** process involves two steps:in the first step,the damaged mural image is firstly utilized as the condition to generate the noise image,using the time,condition and noise image patch as the inputs to the noise prediction network,capturing the global dependencies in the input sequence through the multi-attentionmechanismof the input sequence and feedforward neural network processing,and designing a long skip connection between the shallow and deep layers in the Transformer blocks between the shallow and deep layers using long skip connections to fuse the feature information of global and local outputs to maintain the overall consistency of the restoration results;In the second step,taking the noisy image as a condition to direct the diffusion model to back sample to generate the restored *** results show that the PSNR and SSIM of the proposedmethod are improved by 2%to 9%and 1%to 3.3%,respectively,which are compared to the comparison *** study proposed synthesizes the advantages of the diffusionmodel and deep learningmodel to make themural restoration results more accurate.

关键词： Transformer deep learning noise estimation network diffusion model mural restoration

Digital twin for healthy indoor environment:A vision for the post-pandemic era

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Frontiers of Engineering Management 2023年第2期10卷 300-318页

作者： Jiannan CAI Jianli CHEN yuqing hu Shuai LI Qiang HE School of Civil&Environmental Engineering and Construction ManagementThe University of Texas at San AntonioSan AntonioTX 78249USA Department of Civil&Environmental Engineering The University of UtahSalt Lake CityUT 84112USA Department of Architectural Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Civil and Environmental Engineering The University of TennesseeKnoxvilleKnoxvilleTN 37996USA

Indoor environment has significant impacts on human health as people spend 90%of their time *** COVID-19 pandemic and the increased public health awareness have further elevated the urgency for cultivating and maintaining a healthy indoor *** advancement in emerging digital twin technologies including building information modeling(BIM),Internet of Things(IoT),data analytics,and smart control have led to new opportunities for building design and *** the numerous studies on developing methods for creating digital twins and enabling new functionalities and services in smart building management,very few have focused on the health of indoor *** is a critical need for understanding and envisaging how digital twin paradigms can be geared towards healthy indoor ***,this study reviews the techniques for developing digital twins and discusses how the techniques can be customized to contribute to public ***,the current applications of BIM,IoT sensing,data analytics,and smart building control technologies for building digital twins are reviewed,and the knowledge gaps and limitations are discussed to guide future research for improving environmental and occupant ***,this paper elaborates a vision for future research on integrated digital twins for a healthy indoor environment with special considerations of the above four emerging techniques and *** review contributes to the body of knowledge by advocating for the consideration of health in digital twin modeling and smart building services and presenting the research roadmap for digital twin-enabled healthy indoor environment.

关键词： digital twin healthy indoor environment building information modeling occupant–building interaction COVID-19

Bullous pemphigoid developed in a patient with chronic benign familial pemphigus

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Chinese Medical Journal 2022年第15期135卷 1889-1890页

作者： yuqing hu Jiang Jin Jianzhong Zhang Department of Dermatology Peking University People's HospitalBeijing 100044China

To the Editor:Chronic benign familial pemphigus,or Hailey-Hailey disease(HHD),is an inherited acantholytic dermatosis characterized by chronic recurrent vesicles and maceration in intertriginous sites.l Bullous pemphigoid(BP)is an autoimmune subepidermal ***.2i We reported a patient with clinical and histological features of BP and HHD.

关键词： familial patient chronic

De novo transcriptome assembly and metabolomic analysis of three tissue types in Cinnamomum cassia

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Chinese Herbal Medicines 2023年第2期15卷 310-316页

作者： Hongyang Gao huiju Zhang yuqing hu Danyun Xu Sikai Zheng Shuting Su Quan Yang School of Traditional Chinese Medicine Guangdong Pharmaceutical UniversityGuangzhou 510006China Key Laboratory of Production&Development of Cantonese Medicinal Materials State Administration of Traditional Chinese MedicineGuangzhou 510006China Guangdong Provincial Research Center on Good Agricultural Practice&Comprehensive Agricultural Development Engineering Technology of Cantonese Medicinal Materials Guangzhou 510006China Comprehensive Experimental Station of Guangzhou Chinese Material MedicaChina Agriculture Research System(CARS-21-16)Guangzhou 510006China

Objective:The barks,leaves,and branches of Cinnamomum cassia have been historically used as a traditional Chinese medicine,spice,and food preservative,in which phenylpropanoids are responsible *** phenylpropanoid biosynthesis pathways are not clear in *** elucidated the pathways by descriptive analyses of differentially expressed genes related to phenylpropanoid biosynthesis as well as to identify various phenylpropanoid ***:Chemical analysis,metabolome sequencing,and transcriptome sequencing were performed to investigate the molecular mechanisms underlying the difference of active components content in the barks,branches and leaves of ***:Metabolomic analysis revealed that small amounts of flavonoids,coumarine,and cinnamaldehyde accumulated in both leaves and *** analysis showed that genes associated with phenylpropanoid and flavonoid biosynthesis were downregulated in the leaves and branches relative to the *** observed differences in essential oil content among the three tissues may be attributable to the differential expression of genes involved in the phenylpropanoid and flavonoid metabolic ***:This study identified the key genes in the phenylpropanoid pathway controling the flavonoid,coumarine,and cinnamaldehyde contents in the barks,branches and leaves by comparing the transcriptome and *** findings may be valuable in assessing phenylpropanoid and flavonoid metabolites and identifying specific candidate genes that are related to the synthesis of phenylpropanoids and flavonoids in ***.

关键词： Cinnamomum cassia Presl metabolomic phenylpropanoid biosynthesis transcriptome

The effect of welding materials on 1Cr18Ni9Ti and 2Cr13 steel welded joints electrochemical properties

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China Welding 2022年第3期31卷 42-47页

作者： Zhao Yongtao hu yuqing Dong Junhui Zhou Junwei Material and Metallurgy School Inner Mongolia University of Science and TechnologyBaotou014010China Materials Science and Engineering school Inner Mongolia University of TechnologyHuhhot010051China Steel-making factory Iron and steel group companyBaotou014010China

By method of TIG,two kinds of welding materials were filled in and under certain welding craft conditions,1Cr18Ni9Ti and 2Cr13 were *** microstructure of two kinds of welded joints were observed and analyzed by OM,*** seawater immersion test,polarization curves and AC impedance spectroscopy of two kinds of welding joints were *** results show that 2Cr13 and 1Cr18Ni9Ti welded joints are typical columnar crystal,the microstructure is lath martensite+austenite+*** welded joints that filled in 308 and H1Cr21Ni10Mn7Mo welding wires,corrosion resistance has same change rule:Austenite base metal>HAZ near Austenite>welded joint>HAZ near Martensite>Martensite base *** every zone contrast of two kinds of welded joint corrosion resistance obtains:the welded joints filled in 308>the welded joints filled in H1Cr21Ni10Mn7Mo.

关键词： 1Cr18Ni9Ti 2Cr13 welding materials electrochemical properties

Darcy's Law Expressed by Chemical Index

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Journal of Earth Science 2000年第4期19卷 44-49页

作者： hu Kuanrong Cao yuqing Zhang Wenbing hu Zhongyi Department of Hydrogeology and Engineering Geology, Changchun University of Science and Technology, Changchun 130026

The Darcy's formula expressed by chemical indexes (ion activity a and saturation index β) is derived with the aid of the kinetics of multi-mineral dissolution. The implication of the formula and the relationship between the formula and the original Darcy's law expressed by hydraulic index (hydraulic gradient, Ⅰ) are discussed here. An analytic expression is established in this paper for the determination of the residence time of groundwater by chemical indexes, whose equivalence to isotopic age is studied. The formulas are derived from the calculation of permeability coefficient (K), conductivity coefficient (T) and actual velocity of groundwater (U). Finally, this paper introduces hydrogeological chemical kinetics constant (k j) and its determination method, differential and integral equations for chemical kinetics of groundwater in three-dimensional space.

关键词： Darcy's formula chemical index ion activity saturation index.

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马克思与哈耶克自由观之比较

广东社会科学 2008年第5期 73-76页

作者：胡余清湖南工学院人文社会科学系

马克思与哈耶克的自由观在关于人类理性、自由秩序、自由基础以及经济与政治观点等方面都存在着根本的分歧。哈耶克强调有限理性,导出自生自发秩序,进而将自由界定为法治基础之上的自发性自由;马克思从实践的观点出发,充分肯定人的主观... 详细信息

马克思与哈耶克的自由观在关于人类理性、自由秩序、自由基础以及经济与政治观点等方面都存在着根本的分歧。哈耶克强调有限理性,导出自生自发秩序,进而将自由界定为法治基础之上的自发性自由;马克思从实践的观点出发,充分肯定人的主观的能动性,站在自觉自由的高度,实现了自由的主体与客体的统一,理论与实践的统一,使自由获得了完整的内涵。

关键词：理性自由实践