检索结果-南通市图书馆

Macro-mechanics and Microstructure of Nanomaterial-modified Geopolymer Concrete: A Comprehensive Review

在线全文

cnki会议

学校读者我要写书评

暂无评论

journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 204-214页

作者： WANG Tao FAN Xiangqian gao Changsheng QU Chiyu The National Key Laboratory of Water Disaster Prevention Nanjing Hydraulic Research InstituteNanjing 210024China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China

We have described in detail the effects of nano-SiO_(2),nano-CaCO_(3),carbon nanotubes,and nano-Al_(2)O_(3) on geopolymer concrete from the perspectives of macro mechanics and *** existing research results show that the mechanism of nano-materials on geopolymer concrete mainly includes the filling effect,nucleation effect,and bridging effect,the appropriate amount of nano-materials can be used as fillers to reduce the porosity of geopolymer concrete,and can also react with Ca(Oh)2 to produce C-S-h gel,thereby improving the mechanical properties of geopolymer *** optimum content of nano-SiO_(2) is between 1.0%and 2.0%.The optimum content of nano-CaCO_(3) is between 2.0%and 3.0%.The optimum content of carbon nanotubes is between 0.1%and 0.2%.The optimum content of nano-Al_(2)O_(3) is between 1.0%and 2.0%.The main problems existing in the research and application of nanomaterial-modified geopolymer concrete are summarized,which lays a foundation for the further application of nanomaterial in geopolymer concrete.

关键词： nanomaterials low carbon geopolymer concrete macro-mechanics microstructure

维普期刊数据库

Optimizing battery deployment: Aging trajectory prediction enabling homogenous performance grouping

在线全文

学校读者我要写书评

暂无评论

journal of Energy Chemistry 2025年第1期100卷 565-577页

作者： Shuquan Wang Feng gao Zhan Ma hao Tian Yusen Zhang School of Control Science and Engineering Shandong University Key Lab of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University

As battery deployments in electric vehicles and energy storage systems grow, ensuring homogeneous performance across units is crucial. We propose a multi-derivative imaging fusion(MDIF) model, employing advanced imaging and machine learning to predict battery aging trajectories from minimal initial data, thus facilitating effective performance grouping before deployment. Utilizing a derivative strategy and Gramian Angular Difference Field for dimensional enhancement, the MDIF model uncovers subtle predictive features from discharge curve data after only ten cycles. The architecture includes a parallel convolutional neural network with lateral connections to enhance feature integration and *** on a self-developed dataset, the model achieves an average root-mean-square error of 0.047 Ah and an average mean absolute percentage error of 1.60%, demonstrating high precision and *** robustness is further validated through transfer learning on two publicly available datasets, adapting with minimal retraining. This approach significantly reduces the testing cycles required, lowering both time and costs associated with battery testing. By enabling precise battery behavior predictions with limited data, the MDIF model optimizes battery utilization and deployment strategies, enhancing system efficiency and sustainability.

关键词： Lithium-ion battery Battery prognostics Fusion model Convolutional neural network Transfer learning

Prediction of Dirac state in monolayer TiB2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Prediction of Dirac state in monolayer TiB2

中国真空学会2014学术年会

作者： L.Z.Zhang S.R.Song Z.F.Wang S.X.Du h.-j.gao F.Liu Institute of Physics Chinese Academy of Sciences Department of Materials Science and Engineering University of Utah Collaborative Innovation Center of Quantum Matter

We predict the existence of Dirac state in monolayer TiB2 sheet(m-TiB2),a two-dimensionalmetal diboride,based on first-principles *** structure of m-TiB2 is found to becharacterized with anisotropic Dirac cones with the largest Fermi velocity of 0.57×10m/s,whichis about one-half of that of *** Dirac point is located at the Fermi level between K andΓpoint,with Dirac states arising primarily from d orbitals of *** m-TiB2 exhibitsa bending instability,so that a planar m-TiB2 needs to be stabilized on a *** m-TiB2 on h-BN substrate reveals a negligible influence of the h-BN substrate to the electronicproperties of *** findings extend the Dirac materials to metal diborides.

关键词： Dirac state two-dimensional material TiB2 first-principles calculations

Assembly Mechanism of Iron PhthaAssembly Mechanism of Iron Phthalocyanine and Pentacene Molecules on a Graphene Monolayer Grown on Ru（0001）

在线全文

cnki会议

学校读者我要写书评

暂无评论

Assembly Mechanism of Iron PhthaAssembly Mechanism of Iron P...

中国化学会第28届学术年会

作者： S.X.Du,h.G.Zhang,j.T.Sun,L.Z.Zhang,Y.Pan,and h.-j.gao Institute of Physics,Chinese Academy of Sciences,P.O.Box 603,Beijing 100190,China

＜正＞Combining ab initio calculation based on density functional theory with scanning tunneling microscopy/spectroscopy,we demonstrate the selective adsorption and the formation mechanism of ordered molecular arrays of iron phthalocyanine and pentacene molecules with different structural symmetries on the graphene/Ru（0001）templates. With in-depth investigations of the molecular adsorption and assembly

关键词：

Unveiling the promotion role of ZnO on Zn-Al spinel oxide for CO2 hydrogenation

在线全文

cnki会议

学校读者我要写书评

暂无评论

journal of Energy Chemistry 2025年第1期100卷 18-25页

作者： Tongyao Wang Xinlong Yao Lixin Liang hongyu Chen Pan gao Guangjin hou State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The Zn-Al spinel oxide stands out as one of the most active catalysts for high-temperature methanol synthesis from CO2hydrogenation. however, the structure–activity relationship of the reaction remains poorly understood due to challenges in atomic-level structural characterizations and analysis of reaction intermediates. In this study, we prepared two Zn-Al spinel oxide catalysts via coprecipitation（ZnAl-C）and hydrothermal（ZnAl-h） methods, and conducted a comparative investigation in the CO2hydrogenation reaction. Surprisingly, under similar conditions, ZnAl-C exhibited significantly higher selectivity towards methanol and DME compared to ZnAl-h. Comprehensive characterizations using X-ray diffraction（XRD）, Raman spectroscopy and electron paramagnetic resonance（EPR） unveiled that ZnAl-C catalyst had abundant ZnO species on its surface, and the interaction between the ZnO species and its ZnAl spinel oxide matrix led to the formation of oxygen vacancies, which are crucial for CO2adsorption and activation. Additionally, state-of-the-art solid-state nuclear magnetic resonance（NMR） techniques,including ex-situ and in-situ NMR analyses, confirmed that the surface ZnO facilitates the formation of unique highly reactive interfacial formate species, which was readily hydrogenated to methanol and DME. These insights elucidate the promotion effects of ZnO on the ZnAl spinel oxide in regulating active sites and reactive intermediates for CO2-to-methanol hydrogenation reaction, which is further evidenced by the significant enhancement in methanol and DME selectivity observed upon loading ZnO onto the ZnAl-h catalyst. These molecular-level mechanism understandings reinforce the idea of optimizing the ZnO-ZnAl interface through tailored synthesis methods to achieve activity-selectivity balance.

关键词： Reaction intermediates

The Mechanism of heating Rate on the Secondary Recrystallization Evolution in Grain Oriented Silicon Steel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 275-282页

作者： gao Qian LI jun WANG Xianhui CAO Laifu GONG jian LI Bo Central Iron and Steel Research Institute Group Beijing 100081China Shougang Zhixin Electromagnetic Material R&D(Beijing)Co. Ltd.Beijing 101300China Beijing Shougang Co. Ltd.Qian’an 064404China

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing,in which the evolution of magnetic properties,grain orientations and precipitates were *** illustrate the Zener factor,the diameter and number density of precipitates of interrupted testing samples were statistically *** effect of precipitate ripening on the Goss texture and magnetic property was *** indicated that the trend of Zener factor was similar under different heating rates,first increasing and then decreasing,and that the precipitate maturing was greatly inhibited as the heating rate *** recrystallization was developed at the temperature of 1010℃when a heating rate of 5℃/h was used,resulting in Goss,Brass and{110}oriented grains growing abnormally and a magnetic induction intensity of ***,increasing the heating rate to 20℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss ***,when the heating rate was extremely fast,such as 40℃/h,poor secondary recrystallization was developed with many island grains,corresponding to a decrease in magnetic induction intensity to 1.87 *** a suitable heating rate of 20℃/h,the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1020℃were found among the experimental variables in this *** heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates,leading to the deviation and dispersion of Goss texture,thereby reducing the magnetic properties.

关键词： high temperature annealing heating rate secondary recrystallization grain oriented silicon steel

维普期刊数据库

Strong Photoluminescence of Nanostructured Tungsten Oxides Thin Films

在线全文

学校读者我要写书评

暂无评论

Strong Photoluminescence of Nanostructured Tungsten Oxides T...

2005年纳米和表面科学与技术全国会议

作者： M.Feng A.L.Pan h.R.Zhang Z.A.Li F.Liu h.W.Liu D.X.Shi B.S.Zou h.j.gao Nanoscale Physics and Devices Laboratory,Institute of Physics,CAS,Beijing 100080

Strong photoluminescence(PL)is observed in nanostructured crystalline tungstenoxides thin films that are prepared by thermal *** kinds of films *** is made of nanoparticles and another of *** room

关键词：

Atomic Structure of a Thin Silica Film on a Mo(112)Substrate:a Two-Dimensional Network of SiO4 Tetrahedra

在线全文

cnki会议

学校读者我要写书评

暂无评论

Atomic Structure of a Thin Silica Film on a Mo(112)Substrate...

2005年纳米和表面科学与技术全国会议

作者： j.-L.Lu~1 Z.h.Qin~1 D.X.Shi~1 S.Shaikhutdinov~2 h.-j.Freund~2 h.-j.gao~1 1 Institute of Physics,Chinese Academy of Sciences,Beijing 100080,China 2 Fritz-haber-Institut der Max-Planck-Gesellschaft,14195 Berlin,Germany

Materials with reduced dimensions attract much attention because their propertiesmay differ significantly from the properties of bulk *** films of dielectricoxides are particularly interesting for a variety of applications that range from insulatinglayers in integrated circuits to supports for metal nanoparticles in sensors and *** films can be grown on supporting metal substrates,with a thickness varying from afew angstroms to as much as 100(?),but only in very few cases crystalline films with a

关键词：

Recent advances of metal vacancies in energy and environmental catalysis:Synthesis,characterization,and roles

在线全文

cnki会议

学校读者我要写书评

暂无评论

Green Energy & Environment 2025年第1期10卷 84-108页

作者： Long Sun Shunzheng Zhao Sirui gao Ronghui Zhu Yiran Tan Xiaolong Tang honghong Yi School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing100083China

With the ongoing depletion of fossil fuels,energy and environmental issues have become increasingly critical,necessitating the search for effective ***,being one of the hallmarks of modern industry,offers a promising avenue for ***,the question of how to significantly enhance the performance of catalysts has gradually drawn the attention of *** engineering,a commonly employed and effective approach to improve catalyst activity,has become a significant research focus in the catalysis field in recent *** vacancies have received extensive attention due to their simple ***,exploration of metal vacancies has remained stagnant for a considerable period,resulting in a scarcity of comprehensive reviews on this ***,based on the latest research findings,this paper summarizes and consolidates the construction strategies for metal vacancies,characterization techniques,and their roles in typical energy and environmental catalytic ***,it outlines potential challenges in the future,aiming to provide valuable references for researchers interested in investigating metal vacancies.

关键词： Metal vacancies Catalysis Construction strategies Characterization techniques Roles