检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

内置应变传感器对沥青混合料力学性能的影响

工程科学学报 2025年第1期47卷 179-194页

作者：柳力李理刘朝晖傅顺发李文博潘厚璇长沙理工大学交通运输工程学院长沙410114 深圳高速工程检测有限公司深圳518000

道路本体结构的智能智慧是道路工程发展的重要方向,内置应变传感器是实现路面结构应变感知的重要手段,为探究内置应变传感器对沥青混合料力学性能影响,运用离散元法,构建了内置应变传感器的沥青混合料细观模型,研究了应变传感器埋设深... 详细信息

道路本体结构的智能智慧是道路工程发展的重要方向,内置应变传感器是实现路面结构应变感知的重要手段,为探究内置应变传感器对沥青混合料力学性能影响,运用离散元法,构建了内置应变传感器的沥青混合料细观模型,研究了应变传感器埋设深度和数量对沥青混合料力学性能影响,分析了沥青混合料材料公称最大粒径、级配和沥青砂浆黏结强度等对内置应变传感器工作性能影响.结果表明:随着传感器埋设深度的增加,梁试件底部三个监测点位处水平拉应力分别增加56.9%、43.5%、43.8%,越接近梁试件底部,其内部水平应力场分布更均匀;与单传感器相比,埋设双传感器的梁试件裂隙增加速度更快,在挠度为0.8 mm时裂隙数便达到267个,单传感器仅为93个;沥青混合料公称最大粒径越大,力链数越少,AC-16、AC-20的平均力链比较AC-13分别降低4.9%、11.4%;沥青混合料级配越粗,荷载传递路径越少,接触力系数量减少77.7%,接触力分布均匀性降低,最大接触力增加74.6%,导致传感器工作稳定性越差;沥青砂浆黏结强度增加,最大接触力下降11%,传感器工作稳定性越好.研究结果可为提升内置应变传感器的沥青混合料耐久性和工作稳定性提供参考.

关键词：道路工程沥青路面力学响应应变传感器离散元方法服役性能

Coordination-Assembled Lanthanide-Organic Ln3L3 Sandwiches or Ln4L4 Tetrahedron: Structural Transformation and Luminescence Modulation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2019年第7期37卷 657-662页

作者： shao-Jun Hu Xiao-Qing Guo li-Peng Zhou li-Xuan Cai Qing-fu Sun State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences FuzhouFujian 350002 China College of Chemistry Fuzhou University Fuzhou Fujian 350108 ChinaState Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences FuzhouFujian 350002 China University of Chinese Academy of Sciences Beijing 100049 ChinaState Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences FuzhouFujian 350002 China

Photo-functional supramolecular lanthanides assemblies have shown great potential in the materials and biomedical *** new tri(tridentate) ligands (L3 and L4) highlighting small variation of the connection position to the central tridentate linkers have been designed,which leads to the emergent formation of either Ln3L3-type sandwich structures or Ln4L4-type tetrahedral ***,nonlinear enhancement of lanthanide luminescence based on the modulation of inter-ligand charge-transfer states has been revealed on the mix-ligand Ln3L3 *** results provide important guidance for structure-design and photoluminescence optimization of supramolecular lanthanide-organic assemblies.

关键词： Structural Transformation Luminescence Modulation

Superior oxygen electrocatalyst derived from metal organic coordination polymers by instantaneous nucleation and epitaxial growth for rechargeable li-O_(2) battery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第3期78卷 169-177,I0005页

作者： Dongdong li Jinbiao Chen Yingtong Chen Yian Wang Yanpeng fu Minhua shao Zhicong Shi Institute of Batteries School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006GuangdongChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloon 999077Hong KongChina Energy Institute The Hong Kong University of Science and TechnologyClear Water BayKowloon 999077Hong KongChina Guangzhou HKUST Fok Ying Tung Research Institute Guangzhou 511458GuangdongChina

Rechargeable aprotic li-O_(2)batteries have attractea increasing attention due to their extremely high capacity,and it is very important to design appropriate strategies to synthesize efficient catalysts used as oxygen *** present work,we present an expedient "instantaneous nucleation and epitaxial growth"(INEG) synthesis strategy for convenient and large-scale synthesis of ultrafine MOCPs nanoparticles(size 50-100 nm) with obvious advantages such as fast synthesis,high yields,low costs and reduced synthetic *** bimetallic Ru/Co-MOCPs are further pyrolyzed to obtain bimetallic Coand low content of Ru-based nanoparticles embedded within nitrogen-doped carbon(Ru/Co@N-C) as an efficient catalyst used in li-O_(2)*** Ru/Co@N-C provides porous carbon framework for the ion transportation and O_(2)diffusion,and has large amounts of metal/nonmetal sites as active site to promote the oxygen reduction reaction(ORR)/oxygen evolution reaction(OER) in li-O_(2)*** a consequence,a high discharge specific capacity of 15246 mA h g^(-1)at 250 mA g^(-1), excellent rate capability at different current densities,and stable overpotential during cycling,are *** work opened up a new understanding for the industrialized synthesis of ultrafine catalysts for li-O_(2)batteries with excellent structural characteristics and electrochemical performance.

关键词： Ultraﬁne MOCPs Expedient synthesis strategy Derivative Bimetallic sites Rechargeable li-O_(2)batteries

DYNAMIC CHARACTERISTICS OF ELECTRO-HYDRAUliC PROPORTIONAL PRESSURE-FLOW HYBRID VALVE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2007年第6期20卷 62-68页

作者： fu linjian QIU Minxiu shao Ancen State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

The structure principles under the flow and pressure working conditions are studied, in order to investigate the dynamic characteristics of the electro-hydraulic proportional pressure-flow hybrid valve. According to the structure principles under the two different working conditions, the transfer functions under such conditions are derived. With the transfer functions, some structure elements that may affect its performance, are investigated, afterwards some principles of optimality and effective methods for improving the dynamic performance of the valve are proposed. The conclusions can be used to instruct engineering applications and products designing. The test results conform to the results of the theoretical analysis and simulation, which proves the correctness of the study and simulation works.

关键词： Electro-hydraulic pressure-flow hybrid valve Dynamic characteristics PQ valve

A Time/Space Separation Based 3D fuzzy Modeling Approach for Nonlinear Spatially Distributed Systems

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2018年第1期15卷 52-65页

作者： Xian-Xia Zhang Zhi-Qiang fu shao-Yuan li Tao Zou Bing Wang Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronics and AutomationShanghai University Institute of Automation Shanghai Jiao Tong University Shenyang Institute of Automation Chinese Academy of Sciences

Spatially distributed systems （SDSs） are usually infinite-dimensional spatio-temporal systems with unknown nonlinearities. Therefore, to model such systems is difficult. In real applications, a low-dimensional model is required. In this paper, a time/space separation based 3D fuzzy modeling approach is proposed for unknown nonlinear SDSs using input-output data measurement. The main characteristics of this approach is that time/space separation and time/space reconstruction are fused into a novel 3D fuzzy system. The modeling methodology includes two stages. The first stage is 3D fuzzy structure modeling which is based on Mamdani fuzzy rules. The consequent sets of 3D fuzzy rules consist of spatial basis functions estimated by Karhunen-Love decomposition. The antecedent sets of 3D fuzzy rules are used to construct temporal coefficients. Going through 3D fuzzy rule inference, each rule realizes time/space synthesis. The second stage is parameter identification of 3D fuzzy system using particle swarm optimization algorithm. After an operation of defuzzification, the output of the 3D fuzzy system can reconstruct the spatio-temporal dynamics of the system. The model is suitable for the prediction and control design of the SDS since it is of low-dimension and simple nonlinear structure. The simulation and experiment are presented to show the effectiveness of the proposed modeling approach.

关键词： Spatially distributed system (SDS) system identification 3D fuzzy system Karhunen-Love decomposition particleswarm optimization (PSO).

M?bius Regular Maps of Order pq

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2019年第5期35卷 690-702页

作者： fu Rong WANG shao Fei DU School of Information Beijing Wuzi University School of Mathematical Sciences Capital Normal University

M?bius regular maps are surface embeddings of graphs with doubled edges such that(i)the automorphism group of the embedding acts regularly on flags and(ii) each doubled edge is a center of a M?bius band on the surface... 详细信息

关键词： Mobius regular maps regular embedding permutation group

A two-grid algorithm based on Newton iteration for the stream function form of the Navier-Stokes equations

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2011年第3期26卷 368-378页

作者： shao Xin-ping HAN Dan-fu Department of Mathematics Zhejiang University Hangzhou 310027 China

In this paper, we propose a two-grid algorithm for solving the stream function formulation of the stationary Navies-Stokes equations. The algorithm is constructed by reducing the original system to one small, nonlinear system on the coarse mesh space and two similar linear systems （with same stiffness matrix but different right-hand side） on the fine mesh space. The convergence analysis and error estimation of the algorithm are given for the case of conforming elements. furthermore, the Mgorithm produces a numerical solution with the optimal asymptotic H^2-error. Finally, we give a numerical illustration to demonstrate the effectiveness of the two-grid algorithm for solving the Navier-Stokes equations.

关键词： Two-grid algorithm Navier-Stokes equations Stream function form Reynolds number Newton iteration.

Metallurgical Source of Cryogenic Intergranular Fracture of Fe-38Mn Austenitic Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2000年第1期7卷 31-35页

作者： fu Rui-dong ZHENG Yang-zeng li shao-hua ZHOU Hui-hua Yanshan University Central Iron & Steel Research Institute Tsinghua University

SEM and Field emitting TEM-EDAX were used to investigate the fracture surface of series impact specimens and the grain boundary chemistries of VIM(vacuum-inductionmelted) Fe-38 Mn austenitic alloy before and after ESR(electroslag remelting,).The quantity and the size of inclusions were also *** results show that the VIM Fe-38 Mn austenitinic alloy water-quenched from 1 100 C undergoes an obvious ductile-to-brittle transition,and the impact work at ambient temperature is 242 J,the corresponding fracture surface exhibits a dimple ***,the impact work at 77 K of VIM alloy is only 25 J and the fracture mode is IGF(intergranular fracture).After ESR,the impact work at ambient temperature is 320 J and the fracture surface exhibits a character of "volcano lava"(meaning excellent toughness);The impact work at 77 K is up to 300 J and the fracture mode is micro void coalescence mixed with *** segregation of Mn is not found in all specimens,but the segregation of S is observed,and the S segregation is decreased after *** examined results of inclusions show that ESR reduces the quantity and improves the morphology of *** the above results it can be seen that the cryogenic IGF of VIM Fe-38 Mn austenitic alloy is related to the S segregation at grain *** ESR the decrease in the quantity and size of inclusion results in the increase of the impact work at ambient temperature,while the restriction of IGF is related to the decrease in the total level,and hence in the grain boundary segregation of S.

关键词： rich Mn austenitic alloy cryogenic intergranular fracture grain boundary segregation electroslag remelting

Effects of nitrogen management on the ratoon crop yield and head rice yield in South USA

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第6期20卷 1457-1464页

作者： WANG Yue-chao li Xiu-fen Lee TARPLEY PENG shao-bing DOU fu-gen Texas A&M Agrilife Research Center 1509 Aggie DriveBeaumontTX 77713USA National Key Laboratory of Crop Genetic Improvement/Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River Ministry of Agriculture and Rural Affairs/College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070P.R.China

Ratoon rice cropping is an important component of the rice cropping system in Texas and south Louisiana,USA,and expanded to Asian countries in *** field studies were conducted with widely planted rice(Oryza sativa L.)cultivars at Eagle Lake,Texas,USA to determine the effects of nitrogen(N)management in main(first)crop(MC)and ratoon(second)crop(RC)on RC *** 2012 and 2013,one cultivar(Presidio)was adopted to determine the effects of RC N management on ratoon yield and head rice *** 2016 and 2017,CL153,CL163 and CL272 in addition to Presidio were adopted to examine the effect of MC N management on ratoon yield and head rice yield.N applied at preflood after MC harvest considerably improved RC *** of 99 kg N ha^(–1)at preflood after MC harvest was practically adequate for RC regrowth,development and approaching the yield potential for *** could produce quite high average grain yields of 5.90 to 6.53 t ha–1 in 2012 and 2013,*** crop N rate only significantly affected MC yield;however,given N applied of 99 kg ha^(–1)at preflood after MC harvest,ratoon yield was not significantly affected by MC N *** the main nor ratoon crop N management had a significant effect on RC head rice *** RC head rice yields(55–65%)were observed in all of the four cultivars and 4 years except for CL272 in *** results indicat that without very high N fertilizer application,rice ratoon crop could produce a considerable grain yield and an expectative head rice *** ratooning could be a practical way to increase rice yields with the minimal input in south Texas and regions with a similar climate.

关键词： rice nitrogen management main crop ratoon crop grain yield head rice yield