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Diversity and structural composition of species in dipterocarp forests:a study from Fasiakhali Wildlife Sanctuary, Bangladesh 认领 引用 被引量：4
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作者 S.C.Das M.S.Alam M.A.Hossain 《Journal of Forestry Research》 SCIE CAS CSCD 2018年第5期1241-1249,共9页
Fasiakhali Wildlife Sanctuary is a protected area composed of tropical remnant rainforest that harbor substantial number of large,old Garjan（Dipterocarpus spp.）trees.The present study assessed composition,structure ... Fasiakhali Wildlife Sanctuary is a protected area composed of tropical remnant rainforest that harbor substantial number of large,old Garjan（Dipterocarpus spp.）trees.The present study assessed composition,structure and diversity of the species in this protected area.A total of 32 trees species were recorded with DBH ≥ 11 cm belonging to 24 genera and 19 families.The forest is low in plant diversity as represented by Shannon–Wiener diversity and Simpson Dominance indices.Dipterocarpus turbinatus was the most dominant species with maximum relative density,frequency,dominance,and importance value index.Syzygium firmum and Tectona grandis followed in terms of dominance.The structural composition indicated higher number of individuals in the medium growth classes（41 to 〈 511 cm DBH and 16–20 m height ranges）,whereas D.turbinatus was the only species that dominated most of the growth classes.Poor stem density in lower growth classes indicated meager recruitment of regeneration which may be due to lower annual precipitation,increased grazing and encroachments.This study will help to understand the patterns of tree species composition and diversity in the remnant dipterocarp forests of Bangladesh.It will also contribute to identifying threatened plants to undertake D.turbinatus based conservation and sustainable management of the Fasiakhali Wildlife Sanctuary. 展开更多
关键词 Species diversity Structural composition Protected area Importance value index Cluster analysis
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Structural composition of oligomeric and polymeric proanthocyanidins from diff erent parts of grape pomace 认领 引用
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作者 Marta de Sá Patrícia Martins Baoshan Sun 《Journal of Polyphenols》 2020年第1期11-23,共13页
Grape pomace is one of the most abundant solid by-products generated during winemaking,rich in bioactive compounds,i.e.,proanthocyanidins.The major objective of this work was to characterize structurally oligomeric an... Grape pomace is one of the most abundant solid by-products generated during winemaking,rich in bioactive compounds,i.e.,proanthocyanidins.The major objective of this work was to characterize structurally oligomeric and polymeric proanthocyanidins of diff erent parts of grape pomace(seed,skin,and stem).Column chromatography techniques were used to isolate oligomeric and polymeric proanthocyanidins fractions from diff erent parts of grape pomace.The purifi ed grape seed proanthocyanidins were used to assess the effi ciency of the three most frequently-used acidic degradation methods,using benzyl mercaptan,phloroglucinol,and cysteamine as nucleophiles.The structural characterization of proanthocyanidins in the different parts of grape pomace was further performed by the phloroglucinolysis and ESI-MS analysis.The results showed signifi cant diff erences in the structural composition of proanthocyanidins among diff erent parts of pomace.A positive correlation was found between the mean degree of polymerization and percentage of galloylation,in both oligomeric and polymeric fractions.The results provided useful information for the preparation of diff erent proanthocyanidins products from grape pomace. 展开更多
关键词 structural composition proanthocyanidins grape pomaces
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Lithiation induced interfacial debonding in carbon fiber structural battery composites 认领 引用
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作者 Chuanxi Hu Heng Bao +3 位作者 Bo Lu Yinhua Bao Yicheng Song Junqian Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期276-290,共15页
This paper investigates the interfacial debonding along the fiber-electrolyte interface induced by fiber lithiation in carbon fiber structure batteries using a shear-lag model,with the model validated through finite e... This paper investigates the interfacial debonding along the fiber-electrolyte interface induced by fiber lithiation in carbon fiber structure batteries using a shear-lag model,with the model validated through finite element simulations.The results demonstrate that as lithiation progresses,the interface transitions from a purely elastic state to a cohesive damage phase,ultimately leading to interfacial debonding.Once debonding initiates,cracks propagate rapidly along the fiber-electrolyte interface,impeding ion and electron transport and significantly degrading the electrochemical performance and load-bearing capacity of the battery.To mitigate interfacial debonding,this study systematically examines the impacts of electrode length,modulus of carbon fiber and solid-state electrolyte,and cross-sectional size ratio.The findings indicate that electrode length and carbon fiber modulus have limited impacts on interfacial debonding,while reducing the modulus of solid-state electrolyte effectively decreases shear stress at the interface,thereby inhibiting debonding.Furthermore,a smaller cross-sectional size ratio alleviates interfacial stress,reducing the possibility of debonding.This research offers theoretical insights for the design of carbon fiber-based batteries,particularly in enhancing their structural stability and performance under electromechanical coupling environment. 展开更多
关键词 Debonding Carbon fiber Lithiation Lithium ion Structural battery composites
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Compositional and structural evolution of the titanium dioxide formation by thermal oxidation 认领 引用
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作者 苏卫锋 Gnaser Hubert +2 位作者 樊永良 蒋最敏 乐永康 《Chinese Physics B》 SCIE EI CAS 2008年第8期3003-3007,共5页
Titanium oxide films were prepared by annealing DC magnetron sputtered titanium films in an oxygen ambient. X-ray diffraction （XRD）, Auger electron spectroscopy （AES） sputter profiling, MCs^＋-mode secondary ion m... Titanium oxide films were prepared by annealing DC magnetron sputtered titanium films in an oxygen ambient. X-ray diffraction （XRD）, Auger electron spectroscopy （AES） sputter profiling, MCs^＋-mode secondary ion mass spectrometry （MCs^＋-SIMS） and atomic force microscopy （AFM） were employed, respectively, for the structural, com- positional and morphological characterization of the obtained films. For temperatures below 875 K, titanium films could not be fully oxidized within one hour. Above that temperature, the completely oxidized films were found to be rutile in structure. Detailed studies on the oxidation process at 925K were carried out for the understanding of the underlying mechanism of titanium dioxide （TiO2） formation by thermal oxidation. It was demonstrated that the formation of crystalline TiO2 could be divided into a short oxidation stage, followed by crystal forming stage. Relevance of this recognition was further discussed. 展开更多
关键词 thermal oxidation titanium oxide compositional and structural evolution
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Dependence of Structural and Optoelectrical Properties on the Composition of Electron Beam Evaporated Zn_xCd1-xS Thin Films 认领 引用
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作者 Shahzad Naseemt and M.Amin Mughal M.Y.Zaheer, N.Ahmed and M.Akram (Dept. of Physics, University of the Punjab, Lahore-54590, Pak 《Journal of Materials Science & Technology》 SCIE EI CAS 1996年第6期413-416,共4页
Thin films of ZnxCd1-xS have been prepared by electron beam evaporation of a mixture of ZnS & CdS powders. The films are deposited onto sodalime glass slides under similar conditions.The composition of the films i... Thin films of ZnxCd1-xS have been prepared by electron beam evaporation of a mixture of ZnS & CdS powders. The films are deposited onto sodalime glass slides under similar conditions.The composition of the films is varied from CdS to ZnS (x=0 to 1). The films show a regular change in color from toner red to orange yellow as Zn concentration increases to maximum.These films are characterized for their optical, electricaI and structural properties. The bandgap value of ZnxCd1-xS films is found to vary linearIy from 2.20 eV to 3.44 eV with change in the x value from 0 to 1. The resistivity of these films is in the range of 171.0 Ωcm to 5.5× 106Ωcm for x=0~0.6. All the samples show cubic structure after annealing in air at 250℃ for 40 min.The lattice constant ao varies from 0.5884 nm to 0.54109 nm linearly. 展开更多
关键词 Thin Dependence of Structural and Optoelectrical Properties on the Composition of Electron Beam Evaporated Zn_xCd x)S Thin Films Zn
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Guided Wave Based Composite Structural Fatigue Damage Monitoring Utilizing the WOA-BP Neural Network 认领 引用 被引量：2
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作者 Borui Wang Dongyue Gao +2 位作者 Haiyang Gu Mengke Ding Zhanjun Wu 《Computers, Materials & Continua》 SCIE EI 2025年第4期455-473,共19页
Fatigue damage is a primary contributor to the failure of composite structures,underscoring the critical importance of monitoring its progression to ensure structural safety.This paper introduces an innovative approac... Fatigue damage is a primary contributor to the failure of composite structures,underscoring the critical importance of monitoring its progression to ensure structural safety.This paper introduces an innovative approach to fatigue damage monitoring in composite structures,leveraging a hybrid methodology that integrates the Whale Optimization Algorithm(WOA)-Backpropagation(BP)neural network with an ultrasonic guided wave feature selection algorithm.Initially,a network of piezoelectric ceramic sensors is employed to transmit and capture ultrasonic-guided waves,thereby establishing a signal space that correlates with the structural condition.Subsequently,the Relief-F algorithm is applied for signal feature extraction,culminating in the formation of a feature matrix.This matrix is then utilized to train the WOA-BP neural network,which optimizes the fatigue damage identification model globally.The proposed model’s efficacy in quantifying fatigue damage is tested against fatigue test datasets,with its performance benchmarked against the traditional BP neural network algorithm.The findings demonstrate that the WOA-BP neural network model not only surpasses the BP model in predictive accuracy but also exhibits enhanced global search capabilities.The effect of different sensor-receiver path signals on the model damage recognition results is also discussed.The results of the discussion found that the path directly through the damaged area is more accurate in modeling damage recognition compared to the path signals away from the damaged area.Consequently,the proposed monitoring method in the fatigue test dataset is adept at accurately tracking and recognizing the progression of fatigue damage. 展开更多
关键词 Structural health monitoring ultrasonic guided wave composite structural fatigue damage monitoring WOA-BP neural network relief-F algorithm
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A pre-strain strategy for suppressing interfacial debonding in carbon fiber structural battery composites 认领 引用
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作者 Chuanxi HU Bo LU +2 位作者 Yinhua BAO Yicheng SONG Junqian ZHANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第9期1699-1714,共16页
This study proposes a pre-strain optimization strategy for carbon fiber structural lithium-ion battery(SLIB) composites to inhibit the interfacial debonding between carbon fibers and solid-state electrolytes due to fi... This study proposes a pre-strain optimization strategy for carbon fiber structural lithium-ion battery(SLIB) composites to inhibit the interfacial debonding between carbon fibers and solid-state electrolytes due to fiber lithiation. Through an analytical shear-lag model and finite element simulations, it is demonstrated that applying tensile pre-strain to carbon fibers before electrode assembly effectively reduces the interfacial shear stress, thereby suppressing debonding. However, the excessive pre-strain can induce the interfacial damage in the unlithiated state, necessitating careful control of the pre-strain within a feasible range. This range is influenced by electrode material properties and geometric parameters. Specifically, the electrodes with the higher solid-state electrolyte elastic modulus and larger electrolyte volume fraction exhibit more significant interfacial damage, making pre-strain application increasingly critical. However, these conditions also impose stricter constraints on the feasible pre-strain range. By elucidating the interplay between pre-strain, material properties, and geometric factors, this study provides valuable insights for optimizing the design of carbon fiber SLIBs. 展开更多
关键词 pre-strain carbon fiber interfacial debonding structural battery composite mechanically-based design
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Research progress on bio-inspired composite structures based on ceramic 3D printing:a review 认领 引用
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作者 Dekun Kong Hailong Wu +4 位作者 Qingquan Zhang Dechao Lyu Yumeng Han Zhihui Zhang Luquan Ren 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期430-468,共39页
Ceramic materials demonstrate great application potential in multiple fields such as aerospace and biomedical engineering due to their excellent mechanical properties,high-temperature resistance,and good biocompatibil... Ceramic materials demonstrate great application potential in multiple fields such as aerospace and biomedical engineering due to their excellent mechanical properties,high-temperature resistance,and good biocompatibility,but their inherent brittleness and processing defects urgently need to be broken through.Inspired by the biological structures found in nature,the integration of biomimicry and additive manufacturing(AM)technologies offers a new pathway for the innovative design of high-performance ceramic materials.This article systematically reviews the fundamental principles and classifications of ceramic AM technology,focusing on six typical elements of biomimetic structural design:coaxial composite structures,surface reinforcement structures,layered composite structures,porous structures,composite multicomponent structures,and intelligent bionic structures.The review delves into their biomimetic principles,preparation strategies,performance advantages,and research progress.Research indicates that through multiscale topological design and functional integration,these structures can significantly enhance the mechanical properties and environmental adaptability of ceramics.Nevertheless,current technologies still face numerous challenges in balancing manufacturing precision and efficiency,controlling cracks and residual stresses caused by interface defects,ensuring long-term material stability under extreme environments,enhancing intelligent response capabilities,and guaranteeing process scalability and performance consistency in clinical applications.Future research should integrate multidisciplinary approaches to optimize structural design and dynamic response,transforming biomimetic ceramic materials from‘biological replication'to‘performance exceeding',thereby providing theoretical and technical support for the customized development of high-performance ceramic devices. 展开更多
关键词 bio-inspired composite structures ceramic additive manufacturing coaxial composite structures composite multicomponent structures intelligent bionic structures
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Lightweight design of solar-powered UAV wings considering mechanical behaviors of joints with an adaptive modelling of joints 认领 引用
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作者 Ruitong Zhang Liang Meng +2 位作者 Jihong Zhu Ying Li Weihong Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期421-450,共30页
This paper presents an innovative approach to optimize the layout and sizing of composite truss skeleton of wing structures of solar-powered unmanned aerial vehicles,with a careful consideration of the mechanical beha... This paper presents an innovative approach to optimize the layout and sizing of composite truss skeleton of wing structures of solar-powered unmanned aerial vehicles,with a careful consideration of the mechanical behavior of joints.A novel finite element model is developed for the connecting joints,which incorporates both the locations and geometries of joints.Furthermore,substructure and parallel computing methods are implemented to tackle the challenges associated with optimizing large-scale trusses.Numerical examples show that the integrated optimization gives a more favorable design in terms of load-carrying performance and weight saving.Design schemes corresponding to different truss classification methods are discussed in terms of mechanical properties and manufacturing difficulties in numerical example. 展开更多
关键词 Layout optimization Joint modeling Composite truss structures Integrated optimization
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Three-dimensional fluid-structure-acoustic method for aeroelastic flutter analysis of coupled composite panel and cavity system in supersonic flow 认领 引用
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作者 Hao Liu Yegao Qu Guang Meng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期673-685,共13页
The paper develops a partitioned three-dimensional fluid-structure-acoustic method to predict the flutter behaviors of a composite panel with a cavity beneath it in supersonic airflow.A higher-order shear deformation ... The paper develops a partitioned three-dimensional fluid-structure-acoustic method to predict the flutter behaviors of a composite panel with a cavity beneath it in supersonic airflow.A higher-order shear deformation theory is employed for laminated panel modeling,considering zigzag effect,and panel's large deformation is accounted for by incorporating nonlinear von Kármán strains.The supersonic airflow is formulated by the unsteady Navier-Stokes equations within the arbitrary Lagrangian-Eulerian framework,which are solved by a finite volume method.Additionally,the sound waves considering finite-amplitude effects,are calculated using a nonlinear finite element method.An implicit partitioned coupling method is used to establish the strong coupling between the unsteady supersonic airflow,composite panel with large deformation,and nonlinear sound waves,which is confirmed through a monolithic fluid-structure-acoustic coupling method.It is revealed that the composite panel-cavity aeroelastic system exhibits a special flutter induced by acoustic resonance,underscoring the crucial role of acoustic-elastic coupling in nonlinear aeroelastic responses.The impact of instability coefficients on flutter dynamics,as derived from linear modal analysis,is discussed,emphasizing that long-time scales are required for the establishment of acoustic resonance within the cavity.The findings suggest that flutter induced by acoustic resonance leads to an acoustic environment with high sound pressure levels in the cavity,particularly in shallow cavities,which could potentially cause detrimental acoustic fatigue of the structure. 展开更多
关键词 Fluid-structure-acoustic interaction Nonlinear aeroelasticity Composite structure Acoustic resonance
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Behavior of Headed Studs in Composite Structures:An Overview 认领 引用
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作者 Mahmoud Alhashash Abdullah Alariyan +2 位作者 Favzi Ghreivati Ahed Habib Maan Habib 《Structural Durability & Health Monitoring》 EI 2026年第3期280-307,共28页
Composite structures have become integral to modern construction owing to their efficiency,strength,and economic benefits,with steel-headed studs serving as critical shear connectors between concrete slabs and steel b... Composite structures have become integral to modern construction owing to their efficiency,strength,and economic benefits,with steel-headed studs serving as critical shear connectors between concrete slabs and steel beams.Existing research has investigated these connectors through push-out and pull-out experiments,fatigue and cyclic protocols,durability and temperature-extreme studies,and a wide range of analytical,numerical,and data-driven models.This study addresses the lack of a consolidated and critical review by combining a systematic review with a bibliometric assessment of 385 Scopus-indexed publications from 2000 to 2025,which shows sustained growth of research output and concentration of highly cited contributions in leading composite-structures outlets.The systematic synthesis highlights that stud performance depends strongly on geometry,grouped-stud interaction,and the surrounding cementitious matrix,and it shows that advanced concretes mixes often increase peak resistance while shifting governing failure toward stud or weld-related mechanisms.Design-code comparisons reported in the reviewed literature indicate that resistance predictions may deviate substantially in ultra-high performance concrete configurations,which supports the need for mode-aware provisions rather than direct extension of normal-concrete formulations.The modeling review identifies a progression from empirical equations toward nonlinear finite element simulation and interpretable machine learning trained on large databases,while noting that design adoption requires transparent applicability limits and physically consistent predictors.The paper concludes by consolidating design implications and by defining targeted research priorities on grouped studs,mixed-action fatigue,durability degradation factors,and interpretable data-driven tools for code-oriented design of composite shear connections. 展开更多
关键词 Steel-headed studs composite structures shear connectors ultra-high-performance concrete fatigue and cyclic behavior
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Effect of cyclic heat treatment and acid etching on microstructure and corrosion resistance of AA7075 认领 引用
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作者 Gui-wei TAN Yun-lai DENG +5 位作者 Xin-yue DENG Ling-ying YE Wen-bo ZHU Yu WANG Xue-hong XU Xiao-bin GUO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第7期1962-1974,共13页
The impact of cyclic heat treatment and acid etching on microstructure and corrosion performance of AA7075 was investigated.The microstructure of the alloy was characterized by EPMA,SEM and TEM,and the corrosion resis... The impact of cyclic heat treatment and acid etching on microstructure and corrosion performance of AA7075 was investigated.The microstructure of the alloy was characterized by EPMA,SEM and TEM,and the corrosion resistance of the alloy was studied by intergranular corrosion test.The results show that driven by continuous thermal energy and content gradient generated by the cyclic heat treatment and acid etching,Mg atoms in the surface layer of AA7075 continuously cross grain boundaries.Finally,a compositional gradient layer with a thickness of 185μm is formed.The surface layer of AA7075 after the dealloying treatment demonstrates reduced intergranular corrosion susceptibility,which is due to low anodic and discontinuously distributed grain boundary precipitates in the dealloyed surface layer. 展开更多
关键词 Al−Zn−Mg−Cu alloy cyclic heat treatment and acid etching composition gradient structure corrosion performance dealloying mechanism
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Composite Structural Optimization by Genetic Algorithm and Neural Network Response Surface Modeling 认领 引用 被引量：22
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作者 徐元铭 李烁 荣晓敏 《Chinese Journal of Aeronautics》 EI CAS 2005年第4期310-316,共7页
Neural-Network Response Surfaces （NNRS） is applied to replace the actual expensive finite element analysis during the composite structural optimization process. The Orthotropic Experiment Method （OEM） is used to s... Neural-Network Response Surfaces （NNRS） is applied to replace the actual expensive finite element analysis during the composite structural optimization process. The Orthotropic Experiment Method （OEM） is used to select the most appropriate design samples for network training. The trained response surfaces can either be objective function or constraint conditions. Together with other conven- tional constraints, an optimization model is then set up and can be solved by Genetic Algorithm （GA）. This allows the separation between design analysis modeling and optimization searching. Through an example of a hat-stiffened composite plate design, the weight response surface is constructed to be objective function, and strength and buckling response surfaces as constraints; and all of them are trained through NASTRAN finite element analysis. The results of optimization study illustrate that the cycles of structural analysis ean be remarkably reduced or even eliminated during the optimization, thus greatly raising the efficiency of optimization process. It also observed that NNRS approximation can achieve equal or even better accuracy than conventional functional response surfaces. 展开更多
关键词 neural network genetic algorithm response surface composite structural optimization
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Structural identification and antioxidative activity evaluation of flaxseed lignan macromolecules: structure-activity correlation 认领 引用 被引量：3
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作者 Chen Cheng Lei Wang +7 位作者 Xiao Yu Fenghong Huang Jing Yang Fang Geng Xiaoyang Xia Xia Xiang Shufang Xu Qianchun Deng 《Food Science and Human Wellness》 SCIE CAS CSCD 2024年第6期3224-3235,共12页
Flaxseed lignan macromolecules(FLM)are a class of important secondary metabolites in fl axseed,which have been widely concerned due to their biological and pharmacological properties,especially for their antioxidative... Flaxseed lignan macromolecules(FLM)are a class of important secondary metabolites in fl axseed,which have been widely concerned due to their biological and pharmacological properties,especially for their antioxidative activity.For the composition and structure of FLM,our results confirmed that ferulic acid glycoside(FerAG)was directly ester-linked with herbacetin diglucoside(HDG)or pinoresinol diglucoside(PDG),which might determine the beginning of FLM biosynthesis.Additionally,p-coumaric acid glycoside(CouAG)might determine the end of chain extension during FLM synthesis in fl axseed.FLM exhibited higher antioxidative activity in polar systems,as shown by its superior 1,1-diphenyl-2-picrylhydrazyl(DPPH)free radical scavenging capacity compared to the 2,2’-azinobis(3-ehtylbenzothiazolin-6-sulfnic acid)(ABTS)cation free radical scavenging capacity in non-polar systems.Moreover,the antioxidative activity of FLM was found to be highly dependent on its composition and structure.In particular,it was positively correlated with the number of phenolic hydroxyl groups(longer FLM chains)and inversely related to the steric hindrance at the ends(lower levels of FerAG and CouAG).These fi ndings verifi ed the potential application of FLM in nonpolar systems,particularly in functional food emulsions。 展开更多
关键词 Flaxseed lignan macromolecules Composition structure Antioxidative activity Structure-activity Correlation Flaxseed lignan macromolecules Composition structure Antioxidative activity Structure-activity Correlation
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Suppression of Co(Ⅱ)ion deposition and hazards:Regulation of SEI film composition and structure 认领 引用 被引量：1
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作者 Jiaqi Zhan Mingzhu Liu +4 位作者 Yutian Xie Jiarong He Hebing Zhou Lidan Xing Weishan Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第2期259-265,I0007,共7页
Despite the presence of Li F components in the solid electrolyte interphase(SEI)formed on the graphite anode surface by conventional electrolyte,these Li F components primarily exist in an amorphous state,rendering th... Despite the presence of Li F components in the solid electrolyte interphase(SEI)formed on the graphite anode surface by conventional electrolyte,these Li F components primarily exist in an amorphous state,rendering them incapable of effectively inhibiting the exchange reaction between lithium ions and transition metal ions in the electrolyte.Consequently,nearly all lithium ions within the SEI film are replaced by transition metal ions,resulting in an increase in interphacial impedance and a decrease in stability.Herein,we demonstrate that the SEI film,constructed by fluoroethylene carbonate(FEC)additive rich in crystalline Li F,effectively inhibits the undesired Li+/Co2+ion exchange reaction,thereby suppressing the deposition of cobalt compounds and metallic cobalt.Furthermore,the deposited cobalt compounds exhibit enhanced structural stability and reduced catalytic activity with minimal impact on the interphacial stability of the graphite anode.Our findings reveal the crucial influence of SEI film composition and structure on the deposition and hazards associated with transition metal ions,providing valuable guidance for designing next-generation electrolytes. 展开更多
关键词 Lithium-ion batteries Transition metal ions SEI film Composition and structure
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Analysis on the Composition and Structure of Branches of Two Kinds of Tree Shapes in Korla Fragrant Pear 认领 引用 被引量：4
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作者 成小龙 廖康 +4 位作者 李楠 赵世荣 孙慧瑛 曼苏尔.那斯尔 刘娟 《Agricultural Science & Technology》 CAS 2013年第7期954-958,共5页
ObjectiveThe thesis aims at investigating the distribution and structural characteristics of various branches in canopy of Korla fragrant pear. MethodStatistic work and analysis were conducted on the numbers and distr... ObjectiveThe thesis aims at investigating the distribution and structural characteristics of various branches in canopy of Korla fragrant pear. MethodStatistic work and analysis were conducted on the numbers and distribution characteristics of various branches in each cubic lattice by using the canopy cellular method. ResultThe results showed that： The total number of scaffold branches of evacuation layered tree shape was 97, which mainly distributed in the lower layer and middle part of the canopy; the total number of scaffold branches of open-center tree shape was 94, which mainly distributed in the lower layer and middle part of the canopy. The total number of annual branches of evacuation layered tree shape was 3 920, which mainly distributed in the middle layer and outer part of the canopy; and the total number of annual branches of the open-center tree shape was 3 183, which mainly distributed in middle layer and outer part of the canopy. The total number of perennial branches of evacuation layered tree shape was 2 184, which mainly distributed in lower layer and outer part of the canopy; the total number of perennial branches of open-center tree shape was 1 444, which mainly distributed in middle layer and outer part of the canopy. ConclusionThe total number and the distribution positions of scaffold branches in the canopy of each tree shape were basically the same. The total numbers of annual branches of the two kinds of tree shapes were different, but the distribution positions were basically the same. The total numbers and the distribution positions of perennial branches in the canopy of the two kinds of tree shapes were different. 展开更多
关键词 Korla fragrant pear Tree shape Composition and structure of branch
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Optimal structural design for a certain near-space composite propeller of airship using adaptive region division blending model 认领 引用 被引量：1
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作者 Weigang AN Tianyu LIN Shigen WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第5期301-316,共16页
Near-space airship is a frontier and hotspot in current military research and development,and the near-space composite propeller is the key technology for its development.In order to obtain higher aerodynamic efficien... Near-space airship is a frontier and hotspot in current military research and development,and the near-space composite propeller is the key technology for its development.In order to obtain higher aerodynamic efficiency at an altitude of 22 km,a certain near-space composite propeller is designed as a long and slender aerodynamic shape with a 10 m diameter,which brings many challenges to the composite structure design.The initial design is obtained by the composite structure variable stiffness design method using based on fixed region division blending model.However,it weighs 23.142 kg,exceeding the required 20 kg.In order to meet the structural design requirements of the propeller,a variable stiffness design method using the adaptive region division blending model is proposed in this paper.Compared with the methods using the fixed region division blending model,this method optimizes region division,stacking thickness and stacking sequence in a single level,considering the coupling effect among them.Through a more refined region division,this method can provide a more optimal design for composite tapered structures.Additionally,to improve the efficiency of optimization subjected to manufacturing constraints,a hierarchical penalty function is proposed to quickly filter out the solutions that do not meet manufacturing constraints.The above methods combined with a Genetic Algorithm(GA)using specific encoding are adopted to optimize the near-space composite propeller.The optimal design of the structure weighs 18.831 kg,with all manufacturing constraints and all structural response constraints being satisfied.Compared with the initial design,the optimal design has a more refined region division,and achieves a weight reduction of 18.6%.This demonstrates that a refined region division can significantly improve the mechanical performance of the composite tapered structure. 展开更多
关键词 Structural optimization Composite tapered structure Genetic algorithm Adaptive region division Manufacturing constraint Near-space composite propeller
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STRUCTURAL EVOLUTION OF UNDERCOOLED SINGLE-PHASE Ni-2wt%Pb MONOTECTIC ALLOY 认领 引用 被引量：4
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作者 H.X. Zheng, H. Xie and X.F. Guo 《Acta Metallurgica Sinica(English Letters)》 EI CAS 2001年第1期72-78,共7页
The structural evolution of undercooled single-phase Ni-2wt%Pb monotectic alloy was systematically investigated by the method of molten glass denucleating combined with superheating cycle. Within the achieved undercoo... The structural evolution of undercooled single-phase Ni-2wt%Pb monotectic alloy was systematically investigated by the method of molten glass denucleating combined with superheating cycle. Within the achieved undercooling range of 22 to 280 K, the solidification structure undergoes three changes at 22 K, 88 K and 187 K, respectively. With the increase of undercooling, common dendrites, the first class granular grains, undercooled dendrites and the second class granular grains come out one after the other. Analytical results show that the granulation mechanism of the first class granular grains is owing to dendrite remelting and recrystallization, and the granulation mechanism of the second is owing to dendrite break-up and recrystallization. 展开更多
关键词 Granulation Lead alloys Microstructure Structure (composition)
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In-service Structural Health Monitoring of a Full-scale Composite Horizontal Tail 认领 引用 被引量：2
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作者 武湛君 GAO Dongyue +1 位作者 WANG Yishou Gorgin RAHIM 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1215-1224,共10页
In-service structural health monitoring（SHM） technologies are critical for the utilization of composite aircraft structures. We developed a Lamb wave-based in-service SHM technology using built-in piezoelectric actu... In-service structural health monitoring（SHM） technologies are critical for the utilization of composite aircraft structures. We developed a Lamb wave-based in-service SHM technology using built-in piezoelectric actuator/sensor networks to monitor delamination extension in a full-scale composite horizontal tail. The in-service SHM technology combine of damage rapid monitoring（DRM） stage and damage imaging diagnosis（DID） stage allows for real-time monitoring and long term tracking of the structural integrity of composite aircraft structures. DRM stage using spearman rank correlation coeffi cient was introduced to generate a damage index which can be used to monitor the trend of damage extension. The DID stage based on canonical correlation analysis aimed at intuitively highlighting structural damage regions in two-dimensional images. The DRM and DID stages were trialed by an in-service SHM experiment of CFRP T-joint. Finally, the detection capability of the in-service SHM technology was verified in the SHM experiment of a full-scale composite horizontal tail. Experimental results show that the rapid monitoring method effectively monitors the damage occurrence and extension tendency in real time; damage imaging diagnosis results are consistent with those from the failure model of the composite horizontal tail structure. 展开更多
关键词 in-service structural health monitoring full-scale composite horizontal tail lamb wave damage rapid monitoring damage imaging diagnosis
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Experimental investigation on mechanical properties of backfill–rock composite structure under in-situ mining and filling stress loading 认领 引用
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作者 Hongjian Lu Chao Mou +7 位作者 Lang Liu Sheng Li Yanbo Zhang Deqing Gan Youzhi Zhang Zhiyi Liu Zhenlin Xue Zhiguo Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2129-2142,I0001-I0009,共14页
Backfill-rock composite structures(BRCSs)are crucial for the stability of underground mining areas.However,during the mining and backfilling cycles,they are subjected to coupled dynamic-static loading.Herein,to system... Backfill-rock composite structures(BRCSs)are crucial for the stability of underground mining areas.However,during the mining and backfilling cycles,they are subjected to coupled dynamic-static loading.Herein,to systematically investigate the mechanical properties of BRCSs under in situ mining and filling stress loading,true triaxial dynamic-static tests were conducted.First,the effects of the depth,cement-tailings(C/T)ratio by mass,and interfacial angle(IA)on the composite strength,deformation characteristics,and failure modes were systematically investigated.Subsequently,the evolution of acoustic emission(AE)signal parameters during BRCS failure was analyzed.Finally,a damage constitutive model was established based on the AE energy analysis.With increasing depth,C/T ratio,and I A,the peak strength and elastic modulus of the BRCS exhibited an upward trend,and the strain during the loading-unloading disturbance stages correspondingly increased.At a C/T ratio of 1:8,the specimens exhibited a rock-dominated load-carrying capacity with distinct brittle failure.Conversely,at a C/T ratio of 1:4,the specimens demonstrated a coupled backfill-rock load-carrying capacity,exhibiting ductile failure in the shallow regions and a transition to brittle failure in the deeper zones.AE signals were concentrated during loading-unloading disturbance,plastic yielding,and failure stages.The dominant failure mode was tensile-shear composite fracture,with the proportion of shear cracks gradually increasing with depth.The damage evolution process of a BRCS can be divided into three stages:initial,accelerated,and ultimate failures.This study provides an important theoretical basis and practical guidance for optimizing C/T ratio and enhancing stability assessment in backfilled mine designs. 展开更多
关键词 backfill mining backfill-rock composite structure mechanical properties true triaxial dynamic-static loading acoustic emis-sion characteristics
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