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Experimental investigation of engineered geopolymer composite for structural strengthening against blast loads

Defence Technology（防务技术） 2024年第2期32卷 496-509页

作者： shan liu Chunyuan liu Yifei Hao Yi Zhang li Chen Zhan li Key Laboratory of Coast Civil Structure Safety of Ministry of Education Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Prefabricated Buildings and Intelligent Construction Hebei University of TechnologyTianjin 300400China Institute of Defense Engineering AMSPLABeijing 100850China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityNanjing 211189JiangsuChina State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of the PLANanjing 210007JiangsuChina

The recent increase in blast/bombing incidents all over the world has pushed the development of effective strengthening approaches to enhance the blast resistance of existing civil *** geopolymer composite(EGC)is a promising material featured by eco-friendly,fast-setting and strain-hardening characteristics for emergent strengthening and ***,the fiber optimization for preparing EGC and its protective effect on structural elements under blast scenarios are *** this study,laboratory tests were firstly conducted to evaluate the effects of fiber types on the properties of EGC in terms of workability,dry shrinkage,and mechanical properties in compression,tension and *** experimental results showed that EGC containing PE fiber exhibited suitable workability,acceptable dry shrinkage and superior mechanical properties compared with other types of *** that,a series of field tests were carried out to evaluate the effectiveness of EGC retrofitting layer on the enhancement of blast performance of typical *** tests include autoclaved aerated concrete(AAC)masonry walls subjected to vented gas explosion,reinforced AAC panels subjected to TNT explosion and plain concrete slabs subjected to contact *** was found that EGC could effectively enhance the blast resistance of structural elements in different *** AAC masonry walls and panels,with the existence of EGC,the integrity of specimens could be maintained,and their deflections and damage were significantly *** plain concrete slabs,the EGC overlay could reduce the diameter and depth of the crater and spallation of specimens.

关键词： Engineered geopolymer composites Fiber optimization Strengthening material Blast resistance Masonry wall Reinforced AAC panel Plain concrete slab

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义务教育阶段天文教育的现状及其建议

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西华师范大学学报（自然科学版） 2024年第2期45卷 224-230页

作者：许祺田海俊刘高潮崔盛李珊珊蒋葵林高晓红付净赵园三峡大学理学院湖北宜昌443002 杭州电子科技大学理学院杭州310018 西华师范大学物理与天文学院四川南充637009 西华师范大学教育研究院四川南充637009 中国科学院国家天文台北京100101 宜昌市教育科学研究院湖北宜昌443000

天文教育是全面提升学生科学素养不可或缺的内容。为准确厘清我国义务教育阶段的天文教育现状,针对性地设计了调查问卷并在全国范围内展开调查。调查发现:学生获取天文知识方式单一,天文基础设施缺乏,教育资源地区间发展不平衡,半数以... 详细信息

天文教育是全面提升学生科学素养不可或缺的内容。为准确厘清我国义务教育阶段的天文教育现状,针对性地设计了调查问卷并在全国范围内展开调查。调查发现:学生获取天文知识方式单一,天文基础设施缺乏,教育资源地区间发展不平衡,半数以上的学生天文知识储备尚未达到《中国公民科学素质基准》;多数学生拥有浓厚的天文兴趣和求知欲,重视天文学习。鉴于此,我们呼吁各级教育及相关部门对天文教育予以关注,要高度重视青少年天文知识匮乏等问题,加强宏观引导,适当增加义务教育阶段天文知识占比,提高教师自身天文科学素养,遵循青少年的认知发展能力,丰富天文教育手段,从而有效提高义务教育阶段天文教育发展水平。

关键词：义务教育阶段天文教育现状调查兴趣程度天文知识

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Theoretical Analysis on Deflection and Bearing Capacity of Prestressed Bamboo-Steel Composite Beams

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Journal of Renewable Materials 2024年第1期12卷 149-166页

作者： Qifeng shan Ming Mao Yushun li School of Civil Engineering Zhejiang Industry Polytechnic CollegeShaoxing312000China School of Civil&Environmental Engineering and Geography Science Ningbo UniversityNingbo315211China College of Civil Engineering and Architecture Qingdao Agricultural UniversityQingdao266109China

A theoretical analysis of upward deflection and midspan deflection of prestressed bamboo-steel composite beams is presented in this *** deflection analysis considers the influences of interface slippage and shear ***,the calculation model for flexural capacity is proposed considering the two stages of *** theoretical results are verified with 8 specimens considering different prestressed load levels,load schemes,and prestress *** results indicate that the proposed theoretical analysis provides a feasible prediction of the deflection and bearing capacity of bamboo-steel composite *** deflection analysis,the method considering the slippage and shear deformation provides better *** theoretical method for bearing capacity matches well with the test results,and the relative errors in the serviceability limit state and ultimate limit state are 4.95%and 5.85%,respectively,which meet the accuracy requirements of the engineered application.

关键词： Bamboo scrimber composite beam prestress deflection bearing capacity

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Reversal of complete atrioventricular block in dialysis patients following parathyroidectomy:A case report

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World Journal of Clinical Cases 2024年第7期12卷 1313-1319页

作者： shan-shan Xu li-Hai Hao Yan-Meng Guan Hemodialysis Center Weifang People’s HospitalWeifang 261041Shandong ProvinceChina

BACKGROUND Refractory secondary hyperparathyroidism(SHPT)is a common complication observed in patients with end-stage renal disease and can result in ectopic *** calcification involving the heart valves and the conduction system can easily lead to arrhythmias,including atrioventricular *** case report describes a maintenance hemodialysis patient with refractory SHPT resulting in a complete atrioventricular block(CAVB),which was eventually reversed to a first-degree atrioventricular *** SUMMARY We present the case of a 31-year-old Asian female who was receiving maintenance hemodialysis because of lupus *** developed SHPT,and an electrocardiogram revealed a first-degree atrioventricular ***,she underwent parathyroidectomy(PTX)with ***,a few years later,she developed SHPT again,and an electrocardiogram revealed a CAVB.A few years after the second PTX surgery,the calcification of the left atrium and left ventricle improved,and her CAVB was *** This case revealed that metastatic cardiac calcification can result in complete atrioventricular *** parathyroid surgery,calcification of the cardiac conduction system improved,leading to reversal of the atrioventricular *** is important for dialysis patients to optimize intact parathyroid hormone therapy and pay attention to calcification metastasis.

关键词： Secondary hyperparathyroidism Ectopic calcification Atrioventricular block Reversal Case report

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Amorphous NiMo_(3)S_(13)/nickel foam integrated anode for lithium-ion batteries

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Tungsten 2024年第2期6卷 438-446页

作者： Ming-Xin Shi Min Wu shan-shan Xiao shan-Ping liu Rui-Qi Yao Ying-Qi li Yong-Hui Wang Yang-Guang li Hua-Qiao Tan Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Faculty of ChemistryNortheast Normal UniversityChangchun 130024China School of Materials Science and Engineering Jilin Jianzhu UniversityChangchun 130118China Institute Charles Gerhardt Montpellier Universite de MontpellierCentre National de la Recherche Scientifi quePlace E.Bataillon34095 Montpellier Cedex 05France

Although crystalline anode materials with long-range ordered lattice structure are in favor of facilitating the electron transfer,their structures are easily disrupted during long-term cycling due to the continuous embedding/de-embedding of lithium *** contrast,the amorphous materials have abundant defects and lithium ion storage sites,refl ecting a superior reaction kinetics and long-term cycling ***,we synthesize an integrated hybrid anode by in-situ loading amorphous NiMo_(3)S_(13)nanosheets on nickel foam *** ting from the introduction of Ni^(2+)that amorphizes the molybdenumsulfur clusters,the assembled lithium ion battery based on the integrated NiMo_(3)S_(13)/nickel foam anode delivers a specifi c capacity up to 1659 mA·h·g^(−1)at a current density of 0.6 A·g^(−1)and exhibits superior rate/cycling performance.

关键词： Molybdenum-sulfur clusters Amorphous Integrated anode Crystalline lithium-ion batteries

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Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 151-161页

作者： Haiting shan Luliang Zhang Q.H.Wu Mengshi li School of Electric Power Engineering South China University of Technology(SCUT)Guangzhou 510641China

Sparse measurements challenge fault location in distribution *** paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements.A virtual injected current vector is formulated to estimate the fault line,which can be reconstructed from voltage sags measured at a few buses using compressive sensing(CS).The relationship between the virtual injected current ratio(VICR)and fault position is deduced from circuit analysis to pinpoint the ***,a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector,where two different sensing matrixes are utilized to improve the *** proposed method is validated in IEEE 34 node test *** results show asymmetric ground fault type,resistance,fault position and access of distributed generators(DGs)do not significantly influence performance of our *** addition,it works effectively under various scenarios of noisy measurement and line parameter *** on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.

关键词： Distribution networks fault location reconstruction accuracy two-stage recovery virtual injected current ratio

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HCRVD: A Vulnerability Detection System Based on CST-PDG Hierarchical Code Representation Learning

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Computers, Materials & Continua 2024年第6期79卷 4573-4601页

作者： Zhihui Song Jinchen Xu Kewei li Zheng shan School of Cyberspace Security Information Engineering UniversityZhengzhou450001China

Prior studies have demonstrated that deep learning-based approaches can enhance the performance of source code vulnerability detection by training neural networks to learn vulnerability patterns in code ***,due to limitations in code representation and neural network design,the validity and practicality of the model still need to be ***,due to differences in programming languages,most methods lack cross-language detection *** address these issues,in this paper,we analyze the shortcomings of previous code representations and neural *** propose a novel hierarchical code representation that combines Concrete Syntax Trees(CST)with Program Dependence Graphs(PDG).Furthermore,we introduce a Tree-Graph-Gated-Attention(TGGA)network based on gated recurrent units and attention mechanisms to build a Hierarchical Code Representation learning-based Vulnerability Detection(HCRVD)*** system enables cross-language vulnerability detection at the *** experiments show that HCRVD surpasses many competitors in vulnerability detection *** benefits from the hierarchical code representation learning method,and outperforms baseline in cross-language vulnerability detection by 9.772%and 11.819%in the C/C++and Java datasets,***,HCRVD has certain ability to detect vulnerabilities in unknown programming languages and is useful in real open-source *** shows good validity,generality and practicality.

关键词： Vulnerability detection deep learning CST-PDG code representation tree-graph-gated-attention network cross-language

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Earthquake potential across the North–South seismic belt of China

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Science Bulletin 2024年第2期69卷 179-182页

作者： Yanchuan li Xinjian shan Chunyan Qu Guohong Zhang Xiaogang Song State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China

The elastic rebound theory,which frames our understanding of earthquakes,suggests that the accumulated elastic strain on faults will ultimately be released through earthquakes[1].As such,identifying the location,rate,and accumulation of slip deficit on faults constitutes a basis for seismic potential assessment[2].Interseismic coupling(ISC)refers to the ratio of the slip deficit rate on a fault to the far-field loading rate,where full and no coupling correspond to 100%and 0%slip deficits,respectively.

关键词： seismic belt fault

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Analytical evaluation of steady-state solute distribution in through- diffusion and membrane behavior test under non-perfectly flushing boundary conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 258-267页

作者： Guannian Chen Yuchao li Kristin MSample-Lord shan Tong School of Civil&Environmental Engineering and Geography Science Ningbo UniversityNingbo315211China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou310058China Ningbo ZCONE High-tech Company limited Ningbo315000China Department of Civil and Environmental Engineering Villanova UniversityVillanovaPAUSA

The through-diffusion and membrane behavior testing procedure using a closed-system apparatus has been widely used for concurrent measurement of diffusion and membrane efficiency coefficients of low-permeability clay-based barrier ***,the common assumption of perfectly flushing conditions at the specimen boundaries could induce errors in analyses of the diffusion coefficients and membrane *** this study,an innovative pseudo three-dimensional(3D)analytical method was proposed to evaluate solute distribution along the boundary surfaces of the soil-porous disks system,considering the non-perfectly flushing *** results were consistent with numerical models under two scenarios considering different inflow/outflow *** proposed model has been demonstrated to be an accurate and reliable method to estimate solute distributions along the *** calculated membrane efficiency coefficient and diffusion coefficient based on the proposed analytical method are more accurate,resulting in up to 50%less relative error than the traditional approach that adopts the arithmetic mean value of the influent and effluent *** retar-dation factor of the clay specimen also can be calculated with a revised cumulative mass ***,the simulated transient solute transport matched with experimental data from a multi-stage through-diffusion and membrane behavior test,validating the accuracy of the proposed method.

关键词： Diffusion testing Membrane behavior Coupled transport Clay barrier Transport modeling

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Can Na+/K+ATPase be a novel target to treat anxiety?A hint from its regulatory effect on neuroinflammation

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中国药理学与毒理学杂志 2021年第9期35卷 664-665页

作者： HUANG Song-qiang ZHU Meng-yuan li shan-shan NIE Xiao-wei BIAN Jin-song Department of Pharmacology School of Medi-cineSouthern University of Science and TechnologyShenzhen 518055China Department of Phar-macology Yong Loo Lin School of MedicineNational University of Singapore117600Singapore Shenzhen Institute of Respiratory Diseases the First Affiliated Hospital(Shenzhen People′s Hospi-tal)Southern University of Science and Technolo-gyShenzhen 518020China

OBJECTIVE Na+/K+-ATPase(NKA)is large membrane protein expressed uni⁃versally which is indispensable for the mainte⁃nance of ionic gradient as well as neuronal excit⁃*** role of NKA in inflammatory regula⁃tion is still *** responses are initiated upon the activation of *** order to investigate the crosslink between NKA and inflammasome,NKAα1 knockout(KO)N2a cells were generated using CRISPR/Cas9 *** AND RESULTS qPCR results showed that NLRP1 and NLRP3 were upregulated in response to NKAα1 loss while both NLRC4 and AIM2 remained ***,consistent with the change in NLRP1 and NLRP3,both the mRNA level of ASC and IL-1βwere significantly increased in NKAα1 KO *** data indicated that NKAα1 interfer⁃ence might influence the level of NLRP1 and NLRP3 inflammasomes in neuronal *** evidence indicating the potential link between NKA and inflammasome pathway were provided using cytokine array assay where all the differen⁃tiated protein detected were closely linked to NLRP1 and *** confirm this effect,we also observed the transcriptional levels of inflam⁃masome proteins in the brain cortex from both NKAα1+/+and NKAα1+/-*** line with the observation gained in NKAα1 KO cells,the mRNA level of NLRP1,NLRP3 and IL-1βwere significantly upregulated in NKAα1+/-mice ***,in the primary cultured astrocytes,treatment with LPS/ATP significantly reduced the mRNA and protein levels of NKAα1 *** data imply that a negative regulation loop between NKAα1 and inflammation may exist in the central nervous *** neuroinflam⁃matory mechanism is currently considered the most potential of interventions to target anxiety,we therefore perform behavioural experiments to investigate the role of NKAα1 in *** restraint stress(CRS)for 10 d significantly reduced the time and frequency of entering the open arm and prolonged the retention time in the closed arm in the elevated p

关键词： Na+/K+ATPase anxiety inflamma⁃some neuroinflammation

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