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Journal of Coal Science & Engineering(China) 2008年第3期14卷 399-402页

作者：华心祝王家臣 The moe key laboratory of Coaimine safety and high efficiency mining Anhui University of Science and TechnologyHuainan 232001China School of Resource and safety Engineering China University of Mining and Technology (Beijing)Beijing 100083China

The working condition of the hydraulic support in working face can be divided into three kinds of situations in the following: roof fall and collapse with cavity,advancing support and *** single support with four-pole in longwall face to the dip as research object,control method was studied to avoid support instability in three situations mentioned *** on these researches,the major factors of influencing on support stability and its controlling measures were put *** to specific conditions of working face 1215(3),which is fully-mechanized and Iongwall face to the dip with great mining height in Zhangji Coal Mine,Huainan mining Group,the effective measures was taken to control supports stability.

关键词：倾斜煤层水力开采煤炭开采煤层高度

Rotating Massive Strangeon Stars and X-Ray Plateau of Short GRBs

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Research in Astronomy and Astrophysics 2024年第3期24卷 47-57页

作者： Xi-Yan Yang Xiao-Yu Lai Wei-Wei Tan Ren-Xin Xu School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China Research Center for Astronomy Hubei University of EducationWuhan 4300205China key laboratory of Quark and Lepton Physics Central China Normal UniversityMinistry of EducationWuhan 430079China School of Physics Peking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

Strangeon stars,which are proposed to describe the nature of pulsar-like compact stars,have passed various observational *** maximum mass of a non-rotating strangeon star could be high,which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon *** study rigidly rotating strangeon stars in the slowly rotating approximation,using the Lennard-Jones model for the equation of *** can significantly increase the maximum mass of strangeon stars with unchanged baryon numbers,enlarging the mass-range of long-lived strangeon *** spin-down after merger,the decrease of radius of the remnant will lead to the release of gravitational *** into account the efficiency of converting the gravitational energy luminosity to the observed X-ray luminosity,we find that the gravitational energy could provide an alternative energy source for the plateau emission of X-ray *** fitting results of X-ray plateau emission of some short gamma-ray bursts suggest that the magnetic dipole field strength of the remnants can be much smaller than that of expected when the plateau emission is powered only by spin-down luminosity of magnetars.

关键词： dense matter-(stars) pulsars general-(stars) gamma-ray burst general

Simple construction of the α-MnO2@ZIF-8 nanomaterial with highly enhanced U(Ⅵ) adsorption performance and assessed removal mechanism

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Progress in Natural Science:Materials International 2023年第4期33卷 508-517页

作者： Siyi Wang Yuxuan Bai Zhixiong Zhang Chengde Xie Wenhui Song Chen Wang Zhuoyu Ji Jianjun Wang North China Electric Power University moe key laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering

In this study, the one-dimensional nanomaterial α-MnO2@ZIF-8 was satisfactorily fabricated using a simple hydrothermal method by modifying ZIF-8 on α-MnO2nanowires for high-performance extraction of U(Ⅵ) out of water solution. The experimental data indicated that the adsorption of U(Ⅵ) on α-MnO2@ZIF-8 was intensely dependent on solution pH but not on ionic strength. The maximum adsorption of U(Ⅵ) on α-MnO2@ZIF-8 at pH= 5.0 and T = 298 K was 802.36 mg/g, substantially higher than the adsorption on α-MnO2(22.32 mg/g) or ZIF-8(551.31 mg/g) under the same conditions, indicating that the performance of the modified α-MnO2was greatly enhanced. Attaining adsorption equilibrium within 45 min, the analytical kinetic process of α-MnO2@ZIF-8 indicated that its adsorption on U(Ⅵ) was monolayer chemisorption. The adsorption experiments and XPS analyzed the possible adsorption mechanism of U(Ⅵ) in the reaction with α-MnO2@ZIF-8 during the adsorption process, namely intra-sphere surface complexation, chemisorption and electrostatic interaction. The simple preparation and high removal efficiency of α-MnO2@ZIF-8 indicated that this adsorbent had good prospects for application in wastewater.

关键词： α-MnO_2@ZIF-8 Adsorption Uranium Mechanism

Review on incorporation of alkali elements and their effects in Cu(In,Ga)Se_(2)solar cells

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Journal of Materials Science & Technology 2022年第1期96卷 179-189页

作者： Yazi Wang Shasha Lv Zhengcao Li State key laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China key laboratory of Radiation Beam Technology and Material Modification(moe) College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China key laboratory of Advanced Materials(moe) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084Chinaa

Cu(In,Ga)Se_(2)(CIGS)is a promising candidate to replace crystalline silicon solar cells and dominate the photovoltaic market in the *** elements such as sodium(Na),potassium(K),rubidium(Rb),and Cesium(Cs)are commonly accepted as indispensable parts to boost cell efficiencies of CIGS thin-film solar ***,a comprehensive understanding of alkali effects on the electronic and chemical properties of the CIGS layer as well as the underlying mechanisms is of paramount importance for achieving high-performance solar *** paper reviews the development process and incorporation pathways of alkalis and then overviews the roles of different alkali elements and their effects on CIGS cells in ***,the unsolved problems and future development prospects are also ***,the understanding and development of widely adopted alkali-fluoride post-deposition treatments(PDTs)are still underway,and together with newly updated research,it will likely enable the CIGS technology to make the conversion efficiency closer to its theoretical limit.

关键词： Cu(In,Ga)Se_(2)(CIGS) Solar cells Post-deposition treatment(PDT) Alkali effects

Eccentric actuator driven by stacked electrohydrodynamic pumps

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第4期23卷 329-334页

作者： Ze-bing MAO Yota ASAI Ardi WIRANATA De-qing KONG Jia MAN Smart Materials Lab Department of Engineering Science and MechanicsShibaura Institute of TechnologyTokyo135-8548Japan Department of Mechanical and Industrial Engineering Faculty of EngineeringUniversity of Gadjah MadaYogyakarta55281Indonesia Muroran Institute of Technology MuroranHokkaidoJapan key laboratory of high efficiency and Clean Mechanical Manufacture of moe School of Mechanical EngineeringShandong UniversityJinan250061China

1 Introduction In the last decades,many fluidic actuators have been developed for numerous applications,e.g.,artificial muscles(Wang and Qu,2016),soft spatial finger(Mao et al.,2020a,2020c),soft robots(Shepherd et al.,2011),and compliant gripper(Li et al.,2021).Differing in their dimensions,they can be categorized into two groups:piston-cylinder fluidic actuators and elastic fluidic actuators(de Voider and Reynaerts,2010;Ye et al.,2019).

关键词： artificial dimensions cylinder

Multifunctional robust aerogel separator towards high-temperature,large-rate,long-cycle lithium-ion batteries

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Chinese Chemical Letters 2023年第5期34卷 530-534页

作者： Mei-Chen Liu Hui-Jun Chen Gang Wu Xiu-Li Wang Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-safety Polymeric Materials(moe) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Separators is indispensable for the normal operation of lithium-ion batteries(LIBs).However,the widely used commercial polyolefin separators have some inherent deficiencies such as poor thermotolerance,high inflammability and inferior electrolyte wettability,which restrict their further applications of the advanced and safe ***,we design a novel thermotolerant(a shrinkage percentage of 0%at 300℃)and flame retarded aerogel separator consisting of aramid nanofibers(ANFs).Because of its high porosity(86.5%±6.1%)and excellent electrolyte uptake(695%),the ANFs aerogel separator has an ionic conductivity of 1.04 mS/cm and a high lithium-ion transference number(0.67),which can endow LIBs with outstanding rate performance and superior cycling ***,the ANFs aerogel separator-based batteries possess a discharge specific capacity of 102 m Ah/g with a capacity retention of 90.7%and a Coulombic efficiency of 99.3%after 600 cycles at 5 *** addition,under an operated temperature of 90℃,the battery with ANFs aerogel separator can still conduct the very steady chargedischarge,presenting a capacity retention of 90.1%and a Coulombic efficiency of 99.6%after 200 cycles at 3 ***,the separator can probably serve as a potential candidate for application to advanced and safe LIBs.

关键词： Aramid nanofibers Aerogel separator Lithium-ion batteries high performance safety

Defect physics of the quasi-two-dimensional photovoltaic semiconductor GeSe

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Chinese Physics B 2022年第11期31卷 60-66页

作者：闫赛超魏金宸王珊珊黄梦麟吴宇宁陈时友 key laboratory of Polar Materials and Devices(moe)and Department of Electronics East China Normal UniversityShanghai 200241China State key laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China

GeSe has recently emerged as a photovoltaic absorber material due to its attractive optical and electrical properties as well as earth abundancy and low ***,the efficiency of GeSe thin-film solar cells(TFSCs)is still low compared to the Shockley–Queisser *** defects are believed to play important roles in the electrical and optical properties of GeSe thin ***,we perform first-principles calculations to study the defect characteristics of *** results demonstrate that no matter under the Ge-rich or Se-rich condition,the Fermi level is always located near the valence band edge,leading to the p-type conductivity of undoped *** Se-rich condition,the Ge vacancy(V_(Ge))has the lowest formation energy,with a(0/2–)charge-state transition level at 0.22 eV above the valence band *** high density(above 10^(17)cm^(-3))and shallow level of VGeimply that it is the p-type origin of *** Se-rich growth condition,Seihas a low formation energy in the neutral state,but it does not introduce any defect level in the band gap,suggesting that it neither contributes to electrical conductivity nor induces non-radiative *** addition,Gei introduces a deep charge-state transition level,making it a possible recombination ***,we propose that the Se-rich condition should be adopted to fabricate high-efficiency GeSe solar cells.

关键词： GeSe bulk point defect concentration photovoltaic

Concurrent topology optimization design of stiffener layout and cross-section for thin-walled structures

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Acta Mechanica Sinica 2021年第3期37卷 472-481,I0003页

作者： Quhao Li Yongxin Qu Yunfeng Luo Shutian Liu key laboratory of high efficiency and Clean Mechanical Manufacture of moe School of Mechanical EngineeringShandong UniversityJinan 250061China State key laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China

Stiffened plates or shells are widely used in engineering structures as primary or secondary load-bearing *** to design the layout and sizes of the stiffeners is of great significance for structural *** this work,a new topology optimization method for simultaneously optimizing the layout and cross-section topology of the stiffeners is developed to solve this *** stilfeners and base plates are modeled by the beam and shell elements,respectively,significantly reducing the computational *** Giavotto beam theory,instead of the widely employed Euler or Timoshenko beam theory,is applied to model the stiffeners for considering the warping deformation in evaluating the section stiffness of the beam.A multi-scale topology optimization model is established by simultaneously optimizing the layout of the beam and the topology of the *** design space is significantly expanded by optimizing these two types of design *** numerical examples are applied to illustrate the validity and effectiveness of the proposed *** results show that the proposed two-scale optimization approach can generate better designs than the single-scale method.

关键词： Stiffener plate design Cross-section optimization Layout optimization Giavotto beam theory

Boosting faradaic efficiency of CO_(2)electroreduction to CO for Fe-NC single-site catalysts by stabilizing Fe^(3+)sites via F-doping

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Nano Research 2022年第9期15卷 7896-7902页

作者： Yiqun Chen Guochang Li Yu Zeng Lijie Yan Xizhang Wang Lijun Yang Qiang Wu Zheng Hu key laboratory of Mesoscopic Chemistry of moe and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

The atomically dispersed Fe^(3+)sites of Fe-N-C single-site catalysts(SSCs)are demonstrated as the active sites for CO_(2)electroreduction(CO_(2)RR)to CO but suffer from the reduction to Fe^(2+)at~−0.5 V,accompanied by the drop of CO faradaic efficiency(FECO)and deterioration of partial current(JCO).Herein,we report the construction of F-doped Fe-N-C SSCs and the electron-withdrawing character of fluorine could stabilize Fe3+sites,which promotes the FECO from the volcano-like highest value(88.2%@−0.40 V)to the high plateau(>88.5%@−0.40-−0.60 V),with a much-increased JCO(from 3.24 to 11.23 mA·cm^(−2)).The enhancement is ascribed to the thermodynamically facilitated CO_(2)RR and suppressed competing hydrogen evolution reaction,as well as the kinetically increased electroactive surface area and improved charge transfer,due to the stabilized Fe^(3+)sites and enriched defects by fluorine *** finding provides an efficient strategy to enhance the CO_(2)RR performance of Fe-N-C SSCs by stabilizing Fe^(3+).

关键词： carbon dioxide electroreduction iron-nitrogen-carbon single-site catalysts fluorine-doping active site regulation

Boosting electroluminescence performance of all solution processed In P based quantum dot light emitting diodes using bilayered inorganic hole injection layers

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Photonics Research 2022年第9期10卷 2133-2139页

作者： QIUYAN LI SHENG CAO PENG YU MEIJING NING KE XING ZHENTAO DU BINGSUO ZOU JIALONG ZHAO School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi UniversityNanning 530004China

The development of high-performance In P-based quantum dot light-emitting diodes(QLEDs)has become the current trend in ecofriendly display and lighting ***,compared with Cd-based QLEDs that have already been devoted to industry,the efficiency and stability of In P-based QLEDs still face great *** this work,colloidal Ni Oxand Mg-doped Ni Oxnanocrystals were used to prepare a bilayered hole injection layer(HIL)to replace the classical polystyrene sulfonate(PEDOT:PSS)HIL to construct high-performance In Pbased *** with QLEDs with a single HIL of PEDOT:PSS,the bilayered HIL enables the external quantum efficiencies of the QLEDs to increase from 7.6%to 11.2%,and the T_(95)lifetime(time that the device brightness decreases to 95%of its initial value)under a high brightness of 1000 cd m^(-2)to prolong about 7 *** improved performance of QLEDs is attributed to the bilayered HIL reducing the mismatched potential barrier of hole injection,narrows the potential barrier difference of indium tin oxide(ITO)/hole transport layer interface to promote carrier balance injection,and realizes high-efficiency radiative *** experimental results indicate that the use of bilayered HILs with p-type Ni Oxmight be an efficient method for fabricating high-performance In P-based QLEDs.

关键词： diodes injection performance