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Insight into the change in carbon structure and thermodynamics during anthracite transformation into graphite

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 162-172页

作者： tian qiu Jian-guo Yang Xue-jie Bai National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

The thermodynamic and kinetic mechanisms of Taixi anthracite during its graphitization process were *** understand the variation trends of carbon arrangement order,microcrystal size,and graphitization degree against temperature during the graphitization process,a series of experiments were performed using Raman spectroscopy and X-ray diffraction(XRD).Subsequently,the influencing factors of the dominant reaction at different temperatures were analyzed using thermodynamics and *** results showed that the graphitization process of Taixi anthracite can be divided into three stages from the perspective of reaction thermodynamics and *** played a crucial role in the formation and growth of a graphitic ***,multivariate mechanisms coexisted in the graphitization *** ultrahigh temperatures,the defects of synthetic graphite could not be completely eliminated and perfect graphite crystals could not be *** low temperatures,the reaction is mainly controlled by dynamics,while at high temperatures,thermodynamics dominates the direction of the reaction.

关键词： anthracite graphitization thermodynamics kinetics

Effects of swirl and hot streak on thermal performances of a high-pressure turbine

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Chinese Journal of Aeronautics 2023年第5期36卷 250-267页

作者： Shenghui ZHANG Shuiting DING Peng LIU tian qiu National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100191China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China

Advanced civil aero-engines tend to adopt lean burn combustors to meet emission *** exit of a lean burn combustor experiences highly non-uniformities in both temperature(Hot Streak,HS)and flow(swirl).This paper presents a numerical investigation on the behaviors of a High-Pressure(HP)turbine under a combined effect of swirl and hot *** investigation was conducted on a GE-E3 HP turbine with unsteady numerical simulations,which considered the realistic clocking position of the HP Nozzle Guide Vane(NGV)relative to the *** influences of swirl orientations on the HS migration and thermal performances on the blade surface were *** indicate that,inside the NGV passage,the swirl’s induced incidence angle effect dominates the HS radial *** transversal movement of HS follows the cross flow and thus makes itself approach the Suction Side(SS)and keep away from the Pressure Side(PS)as passing through the NGV,so that HS near the SS is more influenced by the incidence angle effect than that near the *** for the heat transfer,swirl affects the Heat Transfer Coefficient(HTC)on the NGV’s PS and SS mainly through the incidence angle *** from the NGV,the inlet swirl and HS have limited effect on the HTC on the rotor blade’s PS,while on the rotor blade’s SS,the original vortex system dominates;therefore,the inlet non-uniformities merely enhance the HTC on the SS rather than alter its distribution characteristics.

关键词： High-pressure turbine Hot streak Thermal performances Swirl Orientations Vortex

Engel Condition and p-nilpotency of Finite Groups

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Acta Mathematica Sinica,English Series 2021年第9期37卷 1465-1470页

作者： Lei WANG Zheng tian qiu Shou Hong QIAO School of Mathematics and Statistics Yunnan UniversityKunming 650091P.R.China School of Applied Mathematics Guangdong University of TechnologyGuangzhou 510520P.R.China

Let G be a finite group,and let P be a Sylow p-subgroup of *** the hypothesis that NG(P)is p-nilpotent,we provide some conditions to give a p-nilpotency criterion of finite groups by Engel condition,which improves som... 详细信息

关键词： Finite group p-nilpotency Engel condition p-nilpotent residual

Stellar ages and metallicities of nearby elliptical galaxies

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Research in Astronomy and Astrophysics 2009年第11期9卷 1215-1229页

作者： Bai-tian Tang qiu-Sheng Gu Song Huang Department of Astronomy Nanjing University Nanjing 210093 China

Stellar ages and metallicities are crucial for understanding the formation and evolution of elliptical galaxies. However, due to the age-metallicity degeneracy, it is hard to measure these two parameters accurately with broad-band photometry. In this paper, we observed high-resolution spectra for a sample of 20 nearby elliptical galaxies （EGs） with the NAOC 2.16 m telescope, and determined stellar ages and metallicities by using the empirical population synthesis and Lick/IDS index system methods. We found that stellar ages from these two methods are consistent with each other for purely old EGs; however, stellar metallicities show a zeropoint offset of 0.5 Z⊙. Our results confirm that stellar populations in low-density environment galaxies are more diverse compared to their high-density counterparts. We also investigated the element abundance-galaxy mass relation for nearby elliptical galaxies.

关键词： galaxies elliptical and lenticular, cD -- galaxies statistics -- galaxies stellar content

Five Years of IGCP 649 Project-Diamonds and Recycled Mantle

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 1-3页

作者： YANG Jingsui SHEN Tingting ZHANG Cong qiu tian Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China

The IGCP-649 project―Diamonds and Recycled Mantle‖is an International Geosciences Program sponsored by UNESCO and IUGS in March *** is a global research project,aimed to carry out extensive and systematic research on peridotites,chromitites and related materials such as diamond,moissanite and other unusual minerals,from different ophiolites in global orogenic belts,for understanding the formation and origin of deepmantle minerals in oceanic lithosphere,the origin of carbon for the ophiolite-hosted diamonds,the evolution of Earth’s mantle and the dynamic process of ophiolite *** IGCP-649 project(2015–2019)is undertaken by the Center for Advanced Research on the Mantle(CARMA),leading by *** Yang,Institute of Geology,Chinese Academy of Geological Sciences,and cooperated by an international team of researchers including *** Dilek of Miami University(USA),*** L Griffin of Macquarie University(Australia),*** *** of Dalhousie University(Canada),*** Milushi of Polytechnic University of Tirana(Albania),and *** Metwaly Abu Anbar of Tanta University(Egypt).

关键词： IGCP mantle minerals

Heat treatment effect on electrochemical properties of spinel Li_4Ti_5O_(12)

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Rare Metals 2008年第2期27卷 165-169页

作者： LI Yue ZHAO Hailei tian Zhihong qiu Weihua LI Xue School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Anode material Li4Ti5O12 was prepared at 800℃ by a solid-state reaction, followed by heat-treatment at 600℃ for different times （0, 2, 8, and 12 h）. The effects of heat-treatment time on the particle morphology, rate-capability, and electrode kinetic process of the Li4Ti5O12 electrode, and on the lithium ion diffusion coefficient inside the Li4Ti5O12 electrode were investigated. Proper heat treatment could smoothen the particle surface of Li4Ti5O12 particles and increase the rate-capability of the electrode. Overlong heat treatment might cause particle aggregation and hence result in a poor electrode kinetic process. A sample with 8 h of heat treatment showed the best rate-capability and the lowest electrode reaction resistance. Heat treatment for 2-8 h does not significantly change the lithium ion diffusion coefficient inside the Li4Ti5O12 electrode, whereas, 12-h treatment results in a lower lithium ion diffusion coefficient.

关键词： lithium titanate heat treatment electrochemical property lithium ion battery

Report on the Third IGCP-649 International Workshop on the Mayarí-Baracoa Ophiolites and Chromitites, Cuba

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2305-2309页

作者： YANG Jingsui qiu tian Angelica I.LLANES CASTRO CARMA Institute of GeologyChinese Academy of Geological Sciences Geological Society of Cuba

During April 3rd-14th, the Third International Ophiolite Workshop of the International Geoscience Programme ＂Diamonds and Recycled Mantle＂（IGCP-649） was successfully held in Havana, Cuba （Fig. 1a）. After the workshop, participants participated in a field trip to the Mayari-Baracoa ophiolites and related chromitites in eastern Cuba （Fig. lb）. This Third International Ophiolite Workshop was jointly organized by the IGCP-649 Project Team and the Cuban Geological Survey. This workshop was included in a special session of the VII Cuba Earth Science Convention. Since the 1980s, diamond,

关键词： Report on the Third IGCP-649 International Workshop the Mayari-Baracoa

Reliability criterion of film capacitor based on moisture diffusion in encapsulation

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High Voltage 2023年第6期8卷 1242-1252页

作者： Zheng Li Hua Li tian qiu Fuchang Lin Yucheng Wang School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Pulsed Power Technology Ministry of EducationWuhanChina

The current reliability criterion(RC)of the film capacitor(FC)is usually a fixed value,which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high *** expected lifetime of capacitors would deviate far from the actual *** moisture diffusion process of the encapsulated FC is ana-lysed based on Fick's second *** order to investigate the capacitance loss and moisture diffusion characteristics,4 types of film capacitors are stressed with AC voltage under different temperatures and *** on the staged analysis of the capacitance and weight gain curves,the effect of moisture diffusion on capacitance loss is *** indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight *** effect of voltage on FC aging is the most *** capacitance loss rate increases by 301%when the voltage rises by 30%.An RC calculation method of the FC is further proposed,which could also screen the encap-sulation quality and shorten the aging test duration by at least 80%.

关键词： aging moisture diffusion

Antiviral effects of natural small molecules on aquatic rhabdovirus by interfering with early viral replication

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Zoological Research 2022年第6期43卷 966-976页

作者： Yan Zhou tian-Xiu qiu Yang Hu Lei Liu Jiong Chen State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products Ningbo UniversityNingboZhejiang 315211China Laboratory of Biochemistry and Molecular Biology School of Marine SciencesMeishan CampusNingbo UniversityNingboZhejiang 315832China Key Laboratory of Applied Marine Biotechnology of Ministry of Education Meishan CampusNingbo UniversityNingboZhejiang 315832China

Spring viremia of carp virus(SVCV)is globally widespread and poses a serious threat to aquatic ecology and aquaculture due to its broad host *** develop effective agents to control SVCV infection,we selected 16 naturally active small molecules to assess their anti-SVCV ***,dihydroartemisinin(DHA)(100μmol/L)and(S,S)-(+)-tetrandrine(TET)(16μmol/L)exhibited high antiviral effects in epithelioma papulosum cyprinid(EPC)cells,with inhibitory rates of 70.11%and 73.54%,*** possible antiviral mechanisms were determined as follows:*** with DHA and TET decreased viral particle infectivity in fish cells,suggesting that horizontal transmission of SVCV in the aquatic environment was disrupted;*** neither had an effect on viral adhesion,TET(but not DHA)interfered with SVCV entry into host cells(>80%),suggesting that TET may have an antiviral function in early viral *** in vivo study,both agents enhanced the survival rate of SVCV-infected zebrafish by 53.3%,significantly decreased viral load,and modulated the expression of antiviralrelated genes,indicating that DHA and TET may stimulate the host innate immune response to prevent viral ***,our findings indicated that DHA and TET had positive effects on suppressing SVCV infection by affecting early-stage viral replication,thus holding great potential as immunostimulants to reduce the risk of aquatic rhabdovirus disease outbreaks.

关键词： Spring viremia of carp virus Natural small molecules Antiviral effects Virus internalization Danio rerio