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Study on Criterion of Differential Settlement in Subgrade Widening Project of an Expressway

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Journal of Beijing Institute of Technology 2009年第2期18卷 176-180页

作者：胡江碧张勇费雪良 Transportation research Center Beijing University of Technology Ning Xia Hui Autonormous Region Communications Department China Highway Engineering Consulting group Company Ltd.

Criterion of differential settlement in subgrade is useful for keeping road in a good serving condition. The theory of traditional materials strength and their technologic economy are applied to analyze the additional bend stress of the pavement structure, the equivalent beam of elastic foundation and influence on the pavement structure of an uneven settlement. The allowable settling ratio of pavement index （ △i ） is got and is used to appraise the uneven settlement standard value in subgrade. The allowable settling ratio of pavement index is applied in an certain widening expressway project and △i ≤0.36 % is attained by the analyzing, calculating and adding a certain safe coefficient. This value was put into practice and is effective during the past two years.

关键词： widening and reconstruction project differential settlement allowable settling ratio

Effect of Co^(2+)substitution in B-sites of the perovskite system on the phase formation,microstructure,electrical and magnetic properties of Bi0.5(Na0.68K0.22Li0.10)0.5TiO3 ceramics

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International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1798-1808页

作者： Pamornnarumol Bhupaijit Chonnarong Kaewsai Tawat Suriwong Supree Pinitsoontorn Surirat Yotthuan Naratip Vittayakorn Theerachai Bongkarn Department of Physics Faculty of ScienceNaresuan UniversityPhitsanulok 65000Thailand School of Renewable energy and Smart Grid Technology Naresuan UniversityPhitsanulok 65000Thailand research Center for Academic Excellence in Applied Physics Faculty of ScienceNaresuan UniversityPhitsanulok 65000Thailand Institute of Nanomaterials research and Innovation for energy(IN-RIE) Khon Kaen UniversityKhon Kaen 40002Thailand Department of Chemistry School of ScienceKing Mongkut's Institute of Technology LadkrabangBangkok 10520Thailand

Bi_(0.5)(Na_(0.68)K_(0.22)Li_(0.10))_(0.5)Ti_(1-x)Co_(x)O_(3) lead-free perovskite ceramics(BNKLT-xCo,x=0,0.005,0.010,0.015 and 0.020)were fabricated via the solid-state combustion technique.A small-amount of Co^(2+)ion substitution into Ti-sites led to modification of the phase formation,microstructure,electrical and magnetic properties of BNKLT *** rhombohedral and tetragonal phases were observed in all samples using the X-ray diffraction(XRD)*** Rietveld refinement revealed that the rhombohedral phase increased from 39%to 88%when x increased from 0 to *** average grain size increased when x *** increasing x,more oxygen vacancies were generated,leading to asymmetry in the bipolar strain(S-E)hysteresis *** the composition of x=0.010,a high dielectric constant(ε_(m))of 5384 and a large strain(S_(max))of 0.23%with the normalized strain (d*_(33))of 460 pm·V^(-1) were *** BNKLT-0Co ceramic showed diamagnetic behavior but all of the BNKLT-xCo ceramics exhibited paramagnetic behavior,measured at 50 K.

关键词： BNKLT-xCo dielectric ferroelectric strain magnetic

N-Doped Carbon Nanofibrous Film with Unique Wettability,Enhanced Supercapacitive Property,and Facile Capacity to Demulsify Surfactant Free Oil-in-water Emulsions

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Chemical research in Chinese Universities 2021年第3期37卷 436-442页

作者： WANG Ruifang LEI Weiwei WANG Lei LI Zhenyu CHEN Jingyu HU Zhenzhong State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500P.R.China Center of Functional Materials for Working Fluids of Oil and Gas Field School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu610500P.R.China Institute for Frontier Materials Deakin UniversityGeelong/MelbourneAustralia Chengdu Evermaterials Co. Ltd.Chengdu610500P.R.China Tianjin Key Laboratory of clean energy and Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401P.R.China

Electrospinning and calcination technique have been combined to fabricate N-doped carbon nanofibers(N-CNFs)by introducing amino grafted few-layered hexagonal boron nitride(amino@BN)into polyacrylonitrile(PAN)matrix as filler followed by *** the high N-doping level(10.7%,atomic fraction)with the final product,the as-prepared N-CNFs exhibit interesting surface wettability(superamphiphilicity in air and underwater oleophilicity).Moreover,compared with pristine PAN derived carbon nanofibers(marked as CNFs),N-CNFs exhibit higher graphic structure under fixed carbonizing temperature as *** these advantages aforementioned,the as-prepared N-CNFs exhibit good specific capacitance(ca.200.1 F/g)without activation treatment at the current density of 0.5 A/g in three-electrode configuration,which is about 149%that of CNFs(ca.134 F/g).What’s more,our N-CNFs also display the unexpected capacity to demulsify diverse surfactant free oil-in-water emulsions by simple filtration in large scale with the high water flux ca.(23578±150)L·m^(−2)·h^(−1).

关键词： Carbon nanofibrous membrane Unique wettability Supercapacitor Demulsification of oil-water emulsion

Introduction of Asymmetry to Enhance Thermal Transport in Porous Metamaterials at Low Temperature

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Chinese Physics Letters 2023年第12期40卷 62-67页

作者：杨宇马登科张力发 Phonon Engineering research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceInstitute of Physics Frontiers and Interdisciplinary SciencesSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China

Introducing porosity with different degrees of disorder has been widely used to regulate thermal properties of materials, which generally results in decrease of thermal conductivity. We investigate the thermal conductivity of porous metamaterials in the ballistic transport region by using the Lorentz gas model. It is found that the introduction of asymmetry and Gaussian disorder into porous metamaterials can lead to a strong enhancement of thermal conductivity. By dividing the transport process into ballistic transport, non-ballistic transport, and unsuccessful transport processes, we find that the enhancement of thermal conductivity originates from the significant increase ballistic transport ratio. The findings enhance the understanding of ballistic thermal transport in porous materials and may facilitate designs of high-performance porous thermal metamaterials.

关键词： porous transport conductivity

Tensile and Fracture Behavior of DZ68 Ni-base Superalloy

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Journal of Materials Science & Technology 2009年第6期25卷 727-730页

作者： Enze Liu Shuchen Sun Ganfeng Tu Zhi Zheng Xiurong Guan Lingfeng Zhang School of Materials and Metallurgy Northeastern University Shenyang 110004 China Institute of Metal research Chinese Academy of Sciences Shenyang 110016 China AVIC Xi'an Aero-engine (group) Ltd. Xi'an 710021 China

The tensile and fracture behavior of DZ68 directionally solidified Ni-base superalloy was studied in the temperature range of room temperature （RT） to 1000℃. The fracture mode was examined by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The results show the tensile strength and yield strength of DZ68 alloy increase slightly with increasing temperature, so that at 760℃ its reach maxima value： 1214 and 1019 MPa, respectively. When the experimental temperature is higher than 760℃, the tensile and yield strengths decrease evidently and the ductility increases remarkably. The fractograph of fracture surface for the tensile specimen at room temperature shows a dimple-ductile fracture mode. The fractograph from 760 to 850℃ shows a slide fracture mode. The fractograph from 900 to 1000℃ exhibits a creep rupture mode with uneven deformation.

关键词： Ni-base superalloy Tensile strength Yield strength Fractograph

Sodium-Coordinated Polymeric Phthalocyanines as Stable High-Capacity Organic Anodes for Sodium-Ion Batteries

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energy & Environmental Materials 2023年第4期6卷 22-30页

作者： Jeongyeon Lee Yoonbin Kim Soyong Park Kang Ho Shin Gun Jang Min Jun Hwang Daekyu Kim Kyung-Ah Min Ho Seok Park Byungchan Han Dennis K.P.Ng Lawrence Yoon Suk Lee Department of Applied Biology and Chemical Technology and research Institute for Smart energy The Hong Kong Polytechnic UniversityHung HomKowloon Hong Kong SAR China Department of Chemistry The Chinese University of Hong KongShatinNew Territories Hong Kong SAR China Convergence research Center for energy and Environmental Sciences Sungkyunkwan UniversitySuwon Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul Korea School of Chemical Engineering Sungkyunkwan UniversitySuwon Korea

Sodium-ion batteries(SIBs)have attracted considerable interest as an alternative to lithium-ion batteries owing to their similar electrochemical performance and superior long-term cycle *** materials are regarded as promising anode materials for constructing SIBs with high capacity and good ***,utilization of organic materials is rather limited by their low energy density and poor stability at high current *** overcome these limitations,we utilized a novel polymeric disodium phthalocyanines(pNaPc)as SIB anodes to provide stable coordination sites for Na ions as well as to enhance the stability at high current *** varying the linker type during a one-pot cyclization and polymerization process,two pNaPc anodes with O-(O-pNaPc)and S-linkers(S-pNaPc)were prepared,and their structural and electrochemical properties were *** O-pNaPc binds Na ions with a lower binding energy compared with S-pNaPc,which leads to more facile Na-ion coordination/dissociation when engaged as SIB *** use of O-pNaPc significantly improves the redox kinetics and cycle stability and allows the fabrication of a full cell against Na_(3)V_(2)(PO_(4))_(2)F_(3)/C cathode,which demonstrates its practical application with high energy density(288 Wh kg^(-1))and high power density(149 W kg^(-1)).

关键词： coordination chemistry organic anode phthalocyanine polymerization sodium ion battery

Evalution of Thermal Oxidative Degradation of Trimethylol-propane Trioleate by TG/DTA/DSC

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Journal of Wuhan University of Technology(Materials Science) 2021年第2期36卷 280-288页

作者： ZHAN Wen DUAN Haitao LI Xinxiang LI Jian YUAN Chengqing Wuhan research Institute of Materials Protection China Academy of Machinery Science and TechnologyWuhan 430030China School of energy and Power Engineering Wuhan University of TechnologyWuhan 430063China

In order to evaluate the thermal oxidation degradation behavior of lubricant with different antioxidants,the thermal kinetics equation based on the anlyses of thermogravimetry(TG),differential thermal analysis(DTA),and differential scanning calorimetry(DSC)was established,respectively,to calculate the activation energy of lubricant thermal-oxidative *** thermal analyses of TG and DTA were employed to determine the thermal decomposition properties of ester oils trimethylolpropane trioleate(TMPTO)with butyl-octyl-diphenylamine/octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate/amine-phenol combination *** activation energy of the lubricating oil adding antioxidant is increased relative to the TMPTO base oil,and the order of activation energy are Ec(93.732 kJ·mol^(-1))>Ed(88.71 kJ·mol^(-1))>Eb(58.41 kJ·mol^(-1))>Ea(46.32 kJ·mol^(-1)).The experimental results show that octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate in TMPTO has favorable resistance to thermal oxidation and *** thermal analysis method of DSC accurately reflects the heat exchange of lubricant thermal-oxidative *** order of activation energy is calculated to ED(144.385 kJ·mol^(-1))>EC(110.05 kJ·mol^(-1))>EB(97.187 kJ·mol^(-1))>EA(66.02 kJ·mol^(-1)).It is illustrated that the amine-phenol combination antioxidant has the best thermal oxidation resistance,which is the same as what the oxidation onset temperature effected.

关键词： thermal oxidative degradation thermal kinetics antioxidants trimethylolpropane oleate

AB_(2)-type rare earth-based compounds with C-15 structure:Looking for reversible hydrogen storage materials

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Journal of Rare Earths 2024年第5期42卷 803-816,I0001页

作者： Hao Shen Junxian Zhang Valerie Paul-Boncour Ping Li Zhinian Li Yuanfang Wu Lijun Jiang National Engineering research Center of Nonferrous Metals Materias and Products for New energy GRINM Group Co.LtdBeijing00088China Univ Paris Est Creteil CNRSICMPEUMR 71822 rue Henri Dunant94320ThiaisFrance Institute for Advanced Materials and Technology University of Science and TechnologyBeijing100083China GRIMAT Engineering Institute Co. Ltd.Beijing101407China

AB_(2)-type(A=rare earth,B=transition metal)intermetallic compounds with C15 structure can easily absorb large amount of hydrogen,showing their potential use as hydrogen storage *** crucial problem hindering their application is hydrogen induced amorphization(HIA),which leads to the irreversible hydrogen sorption *** stability of the AB_2 Laves phase compounds,the structural properties,the hydrogenation properties and the controlling factors of HIA are discussed in this *** with other factors,the atomic radii ratio r_A/r_B is the most important one influencing the ***-element substitution is an efficient way to suppress or limit HIA and may enable AB_2 compounds to be suitable for hydrogen storage.

关键词： Rare earth-based AB_2-type compounds Hydrogenation properties Hydrogen induced amorphization Elemental substitution

Reflection and operationalization of the common but differentiated responsibilities and respective capabilities principle in the transparency framework under the international climate change regime

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Advances in Climate Change research 2018年第4期9卷 253-263页

作者： WANG Tian GAO Xiang National Center for Climate Change Strategy and International Cooperation Ministry of Ecology and Environment Beijing 100038 China energy research Institute National Development and Reform Commission Beijing 100038 China

“Common but differentiated responsibilities and respective capabilities”(CBDRRC) is the most significant guiding principle in the international climate change regime, created by the United Nations Framework Convention on Climate Change in 1992 and inherited by the Paris Agreement 24 years later. This paper examines the operationalization of the CBDRRC principle in one of the cornerstone rules of the regimedits transparency provisions, both in existing practice under the convention and possible evolvement in negotiations under the Paris Agreement, from the perspectives of both international rule-making and domestic implementation. The authors have found a continuous enhancement of the transparency framework since the 1990s, and gradual consolidation of a bifurcated system between developed and developing countries into a common one. The authors argue that the transparency framework, as part of the procedural rules, should be designed to facilitate transparent information sharing in accordance with substantive commitments under international climate change laws. Thus, it indirectly reflects historical responsibilities for climate change, while the framework should also be designed as feasible and reflective of the respective capabilities of nations. Finally, the evolution of the transparency framework will aim to enact common and enhanced provisions while differentiating between developed and developing countries in the near term, and greater transparency-related capacity-building for developing countries.

关键词： International climate change law UNFCCC Paris agreement Transparency Common but differentiated responsibilities and respective capabilities principle