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Establishing time-dependent model of deformation modulus caused by bedrock excavation rebound by inverse analysis method

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science china(Technological sciences) 2008年第S2期51卷 1-7页

作者： wu ZhongRu1,2,GU YanChang1,3,GU ChongShi1,2,guo HaiQing1 & SU HuaiZhi1,2 1 Hohai university,Nanjing 210098,china 2 National engineering Research Center of Water Resources Efficient Utilization and engineering Safety,Nanjing 210098,china 3 Nanjing Hydraulic Research Institute,Nanjing 210029,china 1. Hohai university Nanjing 210098 China 2. National engineering Research Center of Water Resources Efficient Utilization and engineering Safety Nanjing 210098 China 3. Nanjing Hydraulic Research Institute Nanjing 210029 China

Rock rebound relaxation deformation,or even rock burst,caused by the excavation of dam base and abutment or high rock slope affects their stability and results in the fall of mechanical properties of the *** an inverse analysis method was proposed in this paper to establish the time-dependent model of deformation modulus caused by excavation *** basic principle is based on the combination of observed data of the excavation rebound deformation of dam abutment or rock slope,and the calculated rebound deformation by FEM under ground stress at the corresponding time in the excavation *** norm of the residuals of observed data and calculated data are taken as the objective ***,the time-dependent model of bedrock deformation modulus can be *** method displays its significance in the design of excavation,construction and operation management of dam base and high slope.

关键词： dam base rebound deformation modulus inverse analysis method time-dependent model Xiaowan Hydropower Station

Risk assessment,fitness cost,cross-resistance,and mechanism of tetraniliprole resistance in the rice stem borer,Chilo suppressalis

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Insect science 2024年第3期31卷 835-846页

作者： Hao Sun Shuai Wang Chong Liu Wen-Kai Hu Jin-Wei Liu Ling-Jun Zheng Meng-Yue gao Fang-Rui guo Song-Tao Qiao Jun-Li Liu bo Sun Cong-Fen gao Shun-Fan wu College of Plant Protection Nanjing Agricultural UniversityState&Local Joint Engineering Research Center of Green Pesticide Invention and ApplicationNanjingChina Bayer Cropscience(china)Co. Ltd.HangzhouChina

The rice stem borer(RSB),Chilo suppressalis,a notorious rice pest in china,has evolved a high resistance level to commonly used ***,a new anthranilic diamide insecticide,effectively controls multiple pests,including ***,the potential resistance risk of RSB to tetraniliprole is still *** this study,the tetraniliprole-selection(Tet-R)strain was obtained through 10 continuous generations of selection with tetraniliprole 30%lethal concentration(LC_(30)).The realized heritability(h^(2))of the Tet-R strain was 0.387,indicating that resistance of RSB to tetraniliprole developed rapidly under the continuous selection of *** Tet-R strain had a high fitness cost(relative fitness=0.53).We established the susceptibility baseline of RSB to tetraniliprole(lethal concentration at LC_(50)=0.727 mg/L)and investigated the resistance level of 6 field populations to *** tested strains that had resistance to chlorantraniliprole exhibited moderate-to high-level resistance to tetraniliprole(resistance ratio=27.7-806.8).Detection of ryanodine receptor(RyR)mutations showed that the Y4667C,Y4667D,I4758M,and Y4891F mutations were present in tested RSB field *** mutations were responsible for the cross-resistance between tetraniliprole and ***,the clustered regularly interspaced palindromic repeats(CRISPR)/CRISPR-associated protein 9-mediated genome-modified flies were used to study the contribution of RyR mutations to tetraniliprole *** order of contribution of a single RyR mutation to tetraniliprole resistance was Y4667D>G4915E>Y4667C~~I4758M>*** addition,the I4758M and Y4667C double mutations conferred higher tetraniliprole resistance than single Y4667C *** results can guide resistance management practices for diamides in RSB and other arthropods.

关键词： Chilo suppressalis diamide resistance fitness cost cross-resistance RyR target-site mutations

Bioinspired coacervate-based bioinks for construction of multiscale tissue engineering scaffolds

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Nano Research 2024年第9期17卷 8209-8219页

作者： Zhongwei guo Shiqiang Zhang Yilin guo Jingjing Xia Xiao wu Hao Hu Rongcheng Hu Fangli Huang Qiulei gao Chun Liu Jingjiang Qiu Wei Sun school of Mechanics and Safety engineering Zhengzhou UniversityZhengzhou 450001China Department of mechanical engineering and Mechanics Tsinghua UniversityBeijing 100084China Precision Medicine Institute Guangdong Provincial Key Laboratory of Orthopedics and TraumatologyThe First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080China Department of mechanical engineering Drexel UniversityPhiladelphiaPA 19104USA

engineering hydrogels that resemble biological tissues of various lengths via conventional fabrication techniques remains ***-dimensional(3D)bioprinting has emerged as an advanced approach for constructing complex biomimetic 3D architectures,which are currently restricted by the limited number of available bioinks with high printability,biomimicry,biocompatibility,and proper mechanical *** by ubiquitous coacervation phenomena in biology,we present a unique mineral-biopolymer coacervation strategy that enables the hierarchical assembly of nanoclay and recombinant human collagen(RHC).This system was observed to undergo a coacervation transition(liquid‒liquid phase separation)*** formed dense phase separated from its supernatant is the coacervate of clay-RHC-rich complexes,where polymer chains are sandwiched between silicate *** dynamics simulation was first used to verify and explore the coacervation ***,the coacervates were demonstrated to be potential bioinks that exhibited excellent self-supporting and shear-thinning viscoelastic *** extrusion-based printing,the versatility of the bioink was demonstrated by reconstructing the key features of several biological tissues,including multilayered lattice,vascular,nose,and ear-like structures,without the need for precrosslinking operations or support ***,the printed scaffolds were cytocompatible,elicited minimal inflammatory responses,and promoted bone regeneration in calvarial defects.

关键词： bioinks coacervation mineral-biopolymer nanoclay tissue engineering scaffold

Highly Aligned Graphene Aerogels for Multifunctional Composites

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Nano-Micro Letters 2024年第6期16卷 276-342页

作者： Ying wu Chao An Yaru guo Yangyang Zong Naisheng Jiang Qingbin Zheng Zhong‑Zhen Yu Beijing Advanced Innovation Center for Materials Genome engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Institute of Materials Intelligent technology Liaoning Academy of MaterialsShenyang 110004People’s Republic of China school of science and engineering The Chinese University of Hong KongShenzhenShenzhenGuangdong 518172People’s Republic of China State Key Laboratory of Organic‑Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Stemming from the unique in-plane honeycomb lattice structure and the sp^(2)hybridized carbon atoms bonded by exceptionally strong carbon–carbon bonds,graphene exhibits remarkable anisotropic electrical,mechanical,and thermal *** maximize the utilization of graphene’s in-plane properties,pre-constructed and aligned structures,such as oriented aerogels,films,and fibers,have been *** unique combination of aligned structure,high surface area,excellent electrical conductivity,mechanical stability,thermal conductivity,and porous nature of highly aligned graphene aerogels allows for tailored and enhanced performance in specific directions,enabling advancements in diverse *** review provides a comprehensive overview of recent advances in highly aligned graphene aerogels and their *** highlights the fabrication methods of aligned graphene aerogels and the optimization of alignment which can be estimated both qualitatively and *** oriented scaffolds endow graphene aerogels and their composites with anisotropic properties,showing enhanced electrical,mechanical,and thermal properties along the alignment at the sacrifice of the perpendicular *** review showcases remarkable properties and applications of aligned graphene aerogels and their composites,such as their suitability for electronics,environmental applications,thermal management,and energy *** and potential opportunities are proposed to offer new insights into prospects of this material.

关键词： Highly aligned graphene aerogels Quantitative characterization of alignment Multifunctional composites Anisotropic properties Multifunctional applications

A Magnetic-Multiplier-Enabled Hybrid Generator with Frequency Division Operation and High Energy Utilization Efficiency

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Research 2024年第1期2023卷 561-570页

作者： Jie Chen Kangjie wu Shaokun Gong Jianchao Wang Ke Wang Hengyu guo College of Physics and Electronic engineering Chongqing Key Laboratory Photo-electric Functional MaterialsChongqing Normal UniversityChongqing 401331China State Key Laboratory of mechanical Transmission College of Mechanical and Vehicle EngineeringChongqing UniversityChongqing 400044China school of Physics Chongqing UniversityChongqing 400044China

The hybrid electromagnetic-triboelectric generator(HETG)is a prevalent device for mechanical energy ***,the energy utilization efficiency of the electromagnetic generator(EMG)is inferior to that of the triboelectric nanogenerator(TENG)at low driving frequencies,which limits the overall efficacy of the *** tackle this issue,a layered hybrid generator consisting of a rotating disk TENG,a magnetic multiplier,and a coil panel is *** magnetic multiplier not only forms the EMG part with its high-speed rotor and the coil panel but also facilitates the EMG to operate at a higher frequency than the TENG through frequency division *** systematic parameter optimization of the hybrid generator reveals that the energy utilization efficiency of EMG can be elevated to that of rotating disk *** a power management circuit,the HETG assumes the responsibility for monitoring the water quality and fishing conditions by collecting low-frequency mechanical *** magneticmultiplier-enabled hybrid generator demonstrated in this work offers a universal frequency division approach to improve the overall outputs of any hybrid generator that collects rotational energy,expanding its practical applications in diverse multifunctional self-powered systems.

关键词： generator rotating assume

Numerical Simulation of Non-destructive Testing of Stainless Steel Composites Plate by Infrared Thermography

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Journal of Shanghai Jiaotong university(science) 2011年第3期16卷 333-336页

作者：李国华胡宇方俊雅谷霞英高聚春吴淼 school of mechanical Electronic & Information engineering China University of Mining and Technology(Beijing)

The non-destructive testing(NDT)of debonding in stainless steel composites plate(SSCP)is performed by infrared thermography,finite element analysis(FEA)software ANSYS is taken as the simulative tool,and 2D simulative model has been set up to investigate effect of the thickness of coating and/or substrate on the detectibility of debonging in *** parameters,namely the maximum defect temperature difference and defect appearing index,are defined to evaluate the detectivity of defects,and their computational methods and formulas are given *** preliminary changing tendency of the maximum defect temperature difference and defect appearing index with the thickness of coating and/or substrate is found by numerical simulation.

关键词： stainless steel composites plate(SSCP) infrared thermography non-destructive testing(NDT) numerical simulation

Soft,body conformable electronics for thermoregulation enabled by kirigami

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Bio-Design and Manufacturing 2024年第4期7卷 453-462页

作者： Lung Chow guangyao Zhao Pengcheng wu Xingcan Huang Jiyu Li Jian Li Wanying Wang Guihuan guo Zhiyuan Li Jiachen Wang Jingkun Zhou Yawen Yang Yuyu gao Binbin Zhang Qiang Zhang Dengfeng Li Ya Huang Kuanming Yao Jian Lu Xinge Yu Department of Biomedical engineering City University of Hong KongHong Kong 999077China Hong Kong Centre for Cerebro-Cardiovascular Health engineering Hong Kong 999077China Department of Biomedical sciences City University of Hong KongHong Kong 999077China Department of mechanical engineering City University of Hong KongHong Kong 999077China

The application of thermoelectric devices(TEDs)for personalized thermoregulation is attractive for saving energy while balancing the quality of *** that directly attach to human skin remarkably minimized the energy wasted for cooling the entire ***,facing the extreme dynamic geometry change and strain of human skin,conventional TEDs cannot align with the contour of our bodies for the best thermoregulation ***,we designed a kirigami-based wearable TED with excellent water vapor permeability,flexibility,and *** analysis and experimental results reveal that our product can withstand various types of large mechanical deformation without circuit *** stated outcome and proposed facile approach not only reinforce the development of wearable TEDs but also offer an innovative opportunity for different electronics that require high conformability.

关键词： Thermoregulation Thermoelectric Kirigami body conformable Wearable

High-repetition-rate and high-power efficient picosecond thin-disk regenerative amplifier

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High Power Laser science and engineering 2024年第2期12卷 16-23页

作者： Sizhi Xu Yubo gao Xing Liu Yewang Chen Deqin Ouyang Junqing Zhao Minqiu Liu Xu wu Chunyu guo Cangtao Zhou Qitao Lue Shuangchen Ruan Key Laboratory of Advanced Optical Precision Manufacturing technology of guangdong Higher Education Institutes Sino-German College of Intelligent ManufacturingShenzhen Technology UniversityShenzhenChina Han’s Laser technology Industry Group Co. Ltd.ShenzhenChina Shenzhen Key Laboratory of Laser engineering College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenChina Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material technology College of Engineering PhysicsShenzhen Technology UniversityShenzhenChina

We present an effective approach to realize a highly efficient,high-power and chirped pulse amplification-free ultrafast ytterbium-doped yttrium aluminum garnet thin-disk regenerative amplifier pumped by a zero-phonon line 969 nm laser *** amplifier delivers an output power exceeding 154 W at a pulse repetition rate of 1 MHz with custom-designed 48 pump *** exceptional thermal management on the thin disk through high-quality bonding,efficient heat dissipation and a fully locked spectrum collectively contributes to achieving a remarkable optical-to-optical efficiency of 61%and a near-diffraction-limit beam quality with an M2 factor of *** the best of our knowledge,this represents the highest conversion efficiency reported in ultrafast thin-disk regenerative ***,the amplifier operates at room temperature and exhibits exceptional stability,with root mean square stability of less than 0.33%.This study significantly represents advances in the field of laser amplification systems,particularly in terms of efficiency and average *** advantageous combination of high efficiency and diffraction limitation positions the thin-disk regenerative amplifier as a promising solution for a wide range of scientific and industrial applications.

关键词： high efficiency high power picosecond laser regenerative amplifier thin-disk laser

基于理论承载性能与应力扩散计算的高强预应力锚索适配垫板设计方法

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铁道科学与工程学报 2024年第5期21卷 1942-1953页

作者：郭新新高新强吴锦花成都理工大学环境与土木工程学院四川成都610059 石家庄铁道大学河北省交通工程结构力学行为演变与控制重点实验室河北石家庄050043

垫板是高强预应力锚索系统的核心组成构件,当其与锚索间适配性不足时,会出现结构可靠性低以及围岩支护效果差等问题。基于垫板的承载力学特性及其应力扩散作用,提出适配高强预应力锚索的垫板设计方法。为此,首先分析垫板的应力扩散作用... 详细信息

垫板是高强预应力锚索系统的核心组成构件,当其与锚索间适配性不足时,会出现结构可靠性低以及围岩支护效果差等问题。基于垫板的承载力学特性及其应力扩散作用,提出适配高强预应力锚索的垫板设计方法。为此,首先分析垫板的应力扩散作用与锚索的支护效应间的关联性。其次,基于不同形式垫板的结构受力特征,提出碗形垫板和平板形垫板的理论承载力计算公式,并由此计算得到满足高强预应力锚索承载性能需求的垫板型式及其结构参数。接着,通过建立“垫板(碗形、平板形)-围岩”三维数值仿真模型,分析不同型式及结构参数垫板的围岩应力扩散效果,并由此优选得到适配高强预应力锚索的垫板型式及其结构参数。最后,通过现场应用案例,分析适配垫板下高强预应力锚索系统支护效果。研究结果表明:提出的垫板设计方法实现了对高强预应力锚索系统中垫板的有效选用,适配加载300 kN的高强预应力锚索系统垫板为25 cm×25 cm×16 mm的碗形垫板,其拱高35 mm、孔口半径32 mm、碗底半径75 mm;同时,适配垫板下高强预应力锚索系统的围岩变形控制效果提升了11.9%~15.2%。研究结果有助于提升高强预应力锚索系统的可靠性与支护效果,并为预应力锚固系统中垫板的设计提供了一种可行且有效的方法。

关键词：高强预应力锚索承载性能应力扩散碗形垫板平板垫板