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Multi-Scale Design and Optimization of Composite Material Structure for Heavy-Duty Truck Protection Device

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1961-1980页

作者： Yanhui Zhang Lianhua Ma Hailiang Su Jirong Qin Zhining Chen Kaibiao Deng School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545006China Commercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

In this paper,to present a lightweight-developed front underrun protection device(FUPD)for heavy-duty trucks,plain weave carbon fiber reinforced plastic(CFRP)is used instead of the original high-strength ***,the mechanical and structural properties of plain carbon fiber composite anti-collision beams are comparatively analyzed from a multi-scale *** studying the design capability of carbon fiber composite materials,we investigate the effects of TC-33 carbon fiber diameter(D),fiber yarn width(W)and height(H),and fiber yarn density(N)on the front underrun protective beam of carbon fiber *** on the investigation,a material-structure matching strategy suitable for the front underrun protective beam of heavy-duty trucks is ***,the composite material structure is optimized by applying size optimization and stack sequence optimization methods to obtain the higher performance carbon fiber composite front underrun protection beam of commercial *** results show that the fiber yarn height(H)has the greatest influence on the protective beam,and theH1matching scheme for the front underrun protective beamwith a carbon fiber composite structure exhibits superior *** proposed method achieves a weight reduction of 55.21% while still meeting regulatory requirements,which demonstrates its remarkable weight reduction effect.

关键词： Structural optimization front underrun protection device carbon fiber reinforced plastic multi-scale model lightweight design

Experimental study on ice monitoring method for 10 kV transmission line with tangent tower in alpine landform

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High Voltage 2024年第1期9卷 182-194页

作者： Lin Yang Zhiqiang Chen Yanpeng Hao Xinhao Lin Lei Yu Yue Li Zhiyong Yuan Licheng Li School of Electric Power South China University of TechnologyGuangzhouChina Electrical Power Research Institute China Southern Power GridGuangzhouChina Electric Power Research Institute of Guizhou Power Grid Co.ltd. GuizhouChina

Ice monitoring methods were applied for 110 kV and above transmission lines with tangent ***,the change in the vertical span is not considered,and a significant difference lies in the tower-conductor structure of 10 kV transmission *** this reason,a proposal is made about the ice monitoring method for the 10 kV transmission line with tangent tower in alpine landform,which includes the ice monitoring system based on pressure measurement and corresponding equivalent ice thickness calculating *** methods calculate the vertical span under different height difference coefficients.A finite element simulation model and a simulated ice load experiment system are established based on real conductors and *** and simulations under four simulated terrains are conducted within 2.5–20 mm ice thickness *** comparison is made between this method and the method without considering the change in vertical *** results show that the two methods are consistent and the relative errors are lower than�4%in simulation and�10%in experiment when the height difference coefficient is *** it is not 0,the relative errors of this method fall between t0.38%and t6.78%in simulation and−6.40%to t6.60%in experiment,while the relative errors of the method without considering the change in vertical span ranges between−11.13%and−20.23%in simulation and−11.65%to−23.20%in experiment.

关键词： methods tangent method

Analysis of Urban Agglomeration Network Structure Based on Baidu Migration Data: A Case Study of the Guangdong-Hong Kong-Macao Greater Bay Urban Agglomeration

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Journal of Landscape Research 2024年第4期16卷 47-50页

作者： XIA Yuan WANG Bin guangzhou Urban Planning and Design Co. Ltd.GuangzhouGuangdong 510060China guangzhou Urban Planning&Design Survey Research Institute Co. Ltd.GuangzhouGuangdong 510060China Guangdong Enterprise Key Laboratory for Urban Sensing Monitoring and Early WarningGuangzhouGuangdong 510060China

The inter-city linkage heat data provided by Baidu Migration is employed as a characterization of inter-city linkages in order to facilitate the study of the network linkage characteristics and hierarchical structure of urban agglomeration in the Greater Bay Area through the use of social network analysis *** is the inaugural application of big data based on location services in the study of urban agglomeration network structure,which represents a novel research perspective on this *** study reveals that the density of network linkages in the Greater Bay Area urban agglomeration has reached 100%,indicating a mature network-like spatial *** structure has given rise to three distinct communities:Shenzhen-Dongguan-Huizhou,guangzhou-Foshan-Zhaoqing,and ***,cities within the Greater Bay Area urban agglomeration play different roles,suggesting that varying development strategies may be necessary to achieve staggered *** study demonstrates that large datasets represented by LBS can offer novel insights and methodologies for the examination of urban agglomeration network structures,contingent on the appropriate mining and processing of the data.

关键词： Baidu migration data Social network analysis Urban agglomeration network structure Greater Bay Area urban agglomeration

Eliminating H_(2)O/HF and regulating interphase with bifunctional tolylene-2,4-diisocyanate(TDI)additive for long life Li-ion battery

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Journal of Energy Chemistry 2024年第8期95卷 519-528,I0011页

作者： Xueyi Zeng Xiang Gao Peiqi Zhou Haijia Li Xin He Weizhen Fan Chaojun Fan Tianxiang Yang Zhen Ma Xiaoyang Zhao Junmin Nan School of Chemistry South China Normal UniversityGuangzhou 510006GuangdongChina guangzhou Tinci Materials Technology Co.ltd. Guangzhou 510760GuangdongChina School of Environmental Engineering and Chemistry Luoyang Institute of Science and TechnologyLuoyang 471023HenanChina School of Geomatic and Environmental Engineering Henan Polytechnic InstituteNanyang 473000HenanChina

Lithium-ion batteries(LIBs)featuring a Ni-rich cathode exhibit increased specific capacity,but the establishment of a stable interphase through the implementation of a functional electrolyte strategy remains *** when the battery is operated under high temperature,the trace water present in the electrolyte will accelerate the hydrolysis of the electrolyte and the resulting HF will further erode the *** order to enhance the long-term cycling performance of graphite/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)LIBs,herein,Tolylene-2,4-diisocyanate(TDI)additive containing lone-pair electrons is employed to formulate a novel bifunctional electrolyte aimed at eliminating H_(2)O/HF generated at elevated *** 1000 cycles at 25℃,the battery incorporating the TDI-containing electrolyte exhibits an impressive capacity retention of 94%at 1 *** contrast,the battery utilizing the blank electrolyte has a lower capacity retention of only 78%.Furthermore,after undergoing 550 cycles at 1 C under45℃,the inclusion of TDI results in a notable enhancement of capacity,increasing it from 68%to 80%.This indicates TDI has a favorable influence on the cycling performance of LIBs,especially at elevated *** analysis of the film formation mechanism suggests that the lone pair of electrons of the isocyanate group in TDI play a crucial role in inhibiting the generation of H_(2)O and HF,which leads to the formation of a thin and dense *** existence of this interphase is thought to substantially enhance the cycling performance of the *** work not only improves the performance of graphite/NCM811 batteries at room temperature and high temperature by eliminating H_(2)O/HF but also presents a novel strategy for advancing functional electrolyte development.

关键词： Graphite/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)battery Tolylene-2 4-diisocyanate Long-cycling performance H_(2)O/HF eliminated additive

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Characteristic stress and strain precursor information for fine-grained granite during failure process under triaxial loading and unloading conditions

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Rock Mechanics Bulletin

Rock Mechanics Bulletin 2024年第1期3卷 105-114页

作者： Zhen Peng Xing Su Yuda Chen Jianqiang Xia Diyuan Li School of Resources and Safety Engineering Central South UniversityChangsha410083China China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd.Guangzhou510663China

The unloading effect by excavation may cause irreversible and severe damage to the surrounding rock masses in underground *** this paper,both conventional triaxial compression(CTC)tests and triaxial unloading confining pressure(TUCP)tests were conducted on fine-grained granite to study its triaxial compression failure processes due to *** on the crack volumetric strain(CVS)method,the crack axial strain(CAS)method and crack radial area strain(CRAS)method were proposed to identify the failure precursor information(including stress thresholds and axial strain at the initiation point of crack connectivity stage)during the rock failure *** results of the CTC tests show that the stable crack development stressσsd,unstable crack development stressσusd,and crack connectivity stressσct identified by the CAS method are 6%,74%–84%,and 86%–97%of the peak stress,*** the TUCP cases,as the confining pressure increases,the stress thresholds,axial pressure at failure and axial strain at the start of the crack connectivity stage increase,while the time ratio of the crack connectivity stage to the entire unloading stage *** indicates that fine-grained granite is prone to generate more cracks and leads to fail suddenly under high confining ***,this new method demonstrates that the point at which the derivative of the radial crack area strain transitions from stable to a sudden increase or decrease is defined as the precursor point of rock *** results of axial strain at the starting point of the crack connectivity stage are very close to those predicted by the AE method,withβ1 no more than 11%.

关键词： Conventional triaxial compression test Triaxial unloading confining pressure test Stress thresholds Volumetric strain Acoustic emission

Mitochondria-targeted carrier-free nanoparticles based on dihydroartemisinin against hepatocellular carcinoma

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Chinese Chemical Letters 2024年第10期35卷 329-333页

作者： Zhiyu Yu Xiang Luo Cheng Zhang Xin Lu Xiaohui Li Pan Liao Zhongqiu Liu Rong Zhang Shengtao Wang Zhiqiang Yu Guochao Liao Joint Laboratory for Translational Cancer Research of Chinese Medicine of the Ministry of Education of the People's Republic of China International Institute for Translational Chinese MedicineGuangzhou University of Chinese MedicineGuangzhou 510006China guangzhou Yuemei Pharmaceutical Technology Co. Ltd.Guangzhou 510535China Afiliated Foshan Maternity&Child Healthcare Hospital Southern Medical UniversityFoshan 528000China School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou 510515China Department of Laboratory Medicine Dongguan Institute of Clinical Cancer ResearchDongguan Key Laboratory of Precision Diagnosis and Treatment for TumorsThe Tenth Afiliated Hospital of Southern Medical University(Dongguan People's Hospital)Dongguan 523058China

Hepatocellular carcinoma is a common and fatal malignancy for which there is no effective systemic therapeutic ***(DHA),a derivative of artemisinin,has been shown to exert anti-tumor effects through the production of reactive oxygen species(ROS)and resultant mitochondrial ***,clinical translation is limited by several drawbacks,such as insolubility,instability and low ***,based on a nanomedicine-based delivery strategy,we fabricated mitochondria-targeted carrier-free nanoparticles coupling DHA and triphenylphosphonium(TPP),aiming to improve bioavailability and mitochondrial ***-TPP nanoparticles can be passively delivered to the tumor site by enhanced penetration and retention and then *** cytometry and Western blot analysis showed that DHA-TPP nanoparticles increased intracellular ROS,which increased mitochondrial stress and in turn upregulated the downstream Bcl-2 pathway,leading to *** vivo experiments showed that DHA-TPP nanoparticles exhibited anti-tumor effects in a mouse model of hepatocellular *** findings suggest carrier-free DHA-TPP nanoparticles as a potential therapeutic strategy for hepatocellular carcinoma.

关键词： Hepatocellular carcinoma Carrier-freenanoparticles Dihydroartemisinin Mitochondria targeting Apoptosis

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Fault-tolerant identity-based encryption from SM9

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Science China(Information Sciences) 2024年第2期67卷 104-117页

作者： Xiaohong LIU Xinyi HUANG Zhaohui CHENG Wei WU Fujian Provincial Key Laboratory of Network Security and Cryptology College of Computer and Cyber SecurityFujian Normal University Artificial Intelligence Thrust Information HubThe Hong Kong University of Science and Technology (Guangzhou) Olym Information Security Technology ltd. Center for Applied Mathematics of Fujian Province School of Mathematics and StatisticsFujian Normal University

This paper initiates the formal study of attribute-based encryption within the framework of SM9,the Chinese National Cryptography Standard for Identity-Based Cryptography, by presenting two new faulttolerant identity-based encryption(FIBE) schemes. Our first scheme uses the same private-key/ciphertext structure as the original SM9 algorithm and operates in a small attribute universe. As a result, it can be effectively and smoothly integrated into the information systems using SM9. In the random oracle model,we prove that our scheme is ciphertext-indistinguishable against fuzzy selective-identity and chosen-plaintext attacks under the(k + 3)-DBDHI assumption. Our second design is a large universe FIBE scheme based on SM9 that is ciphertext-indistinguishable against chosen-plaintext attacks in the random oracle model under the(f, g)-GDDHE assumption. Finally, we compare the communication and computing costs of our schemes to those of other classical ones. The comparison shows that our schemes have comparable performance as others. We believe that our findings will accelerate the applications of SM9 in modern information systems such as cloud computing and blockchain.

关键词： attribute-based encryption identity-based encryption fault-tolerant SM9

Exploring the Interplay between Local Chain Structure and Stress Distribution in Polymer Networks

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Chinese Journal of Polymer Science 2024年第6期42卷 874-885页

作者： Jin-Tong Xue Yang Bai Li Peng Xian-Bo Huang Zhao-Yan Sun School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China National-certified Enterprise Technology Center Kingfa Science and Technology Co.Ltd.Guangzhou510663China

The mechanical behavior of polymer networks is intrinsically correlated with the local chain topology and chain *** this study,we delve into this relationship through the lens of coarse-grained molecular dynamics(CG-MD)*** aim is to illuminate the intricate interplay between local topology and stress distribution within polymer monomers,cross-linkers,and various components with distinct cross-link connections,thereby elucidating their collective impact on the mechanical properties of polymer *** mainly focus on how specific local structures contribute to the overall mechanical response of the *** particular,we employ local stress analysis to unravel the mechanics of these *** findings reveal the diverse responses of individual components,such as junctions,strands,cross-linkers between junctions,and dangling chain ends,when subjected to ***,we observe that these components exhibit varying degrees of deformation tolerance,underscoring the significance of their roles in determining the mechanical characteristics of the *** investigations highlight junctions as primary contributors to stress accumulation,and particles with higher local stress showing a stronger correlation between stress and Voronoi ***,our results indicate that both strands and cross-linkers between junctions exhibit heightened stress levels as strand lengths *** study enhances our understanding of the multifaceted factors governing the mechanical attributes of cross-linked polymer systems at the microstructural level.

关键词： Local chain structure Local stress Molecular dynamics simulation

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Analytical solution for tunnelling-induced response of an overlying pipeline considering gap formation

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Underground Space 2024年第2期15卷 298-311页

作者： Cungang Lin Junjie Zheng Yiwen Ye Farrokh Nadim Zhongqiang Liu Chenyang Zhao Yu Chen Zhi Ding Guangdong Research Center for Underground Space Exploitation Technology School of Civil EngineeringSun Yat-sen UniversityGuangzhou 510275China Guangdong Key Laboratory of Marine Civil Engineering School of Civil EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory for Tunnel Engineering Ministry of EducationGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Civil Engineering Wuhan UniversityWuhan 430072China Guangdong Road and Bridge Construction Development Co. Ltd.Guangzhou 510660China Norwegian Geotechnical Institute Oslo 0806Norway Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou 310015China

Soil-pipeline separation due to tunnelling has been certainly substantiated in previous model ***,this phenomenon has seldom been considered in current analytical *** study formulates a tensionless Winkler solution that could make allowance for gap formation in soil-pipeline interaction *** solution is validated by comparisons with existing experimental measurements and two recognized analytical ***,its advantage over an existing Winkler solution is *** parametric studies reveal that the effects of gap formation on the response of a pipeline rely largely on the tunnel volume loss and the pipeline’s bending stiffness and burial *** general,a pipeline’s bending moments and subgrade reaction forces are more susceptible than its deflections to the gap formation.

关键词： Soil-pipeline interaction Tunnelling Tensionless Winkler model Ground settlement Analytical solution Gap formation