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Shock Raman spectra and structural transformation of powdered TKX-50 by the plate impact experiments combined with real-time Raman detection

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Defence Technology（防务技术） 2024年第1期31卷 158-162页

作者： Xue Yang qijun liu Yundan Gan Lei Yang Zhengtang liu Fusheng liu Bond and Band Engineering Group School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China Xi'an Modern Chemistry Research Institute Xi'an 710065People's Republic of China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072People's Republic of China

As an energetic material of great interest,the work capacity of dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate(TKX-50)has been questioned *** some research groups have explored the reasons for the low working ability of TKX-50,the plane impact experiment on powdered TKX-50 is obviously closer to the practical application,and the conclusions based on this are more ***,we performed shock Hugoniot measurements of powdered TKX-50 between 5.65 and 16.29 *** plane impact experiments of powdered TKX-50 were carried out and the shocked Raman spectra were *** Raman spectroscopy analysis,a new peak of powdered TKX-50 was found between19.47 GPa and 24.96 GPa,which may be caused by decomposition/phase transition and was related with the low work capacity.

关键词： Powdered TKX-50 Hugoniot Raman Decomposition Phase transition

1,3,5-Trifluorobenzene endorsed EC-free electrolyte for high-voltage and wide-temperature lithium-ion batteries

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Journal of Energy Chemistry 2023年第10期85卷 49-57,I0003页

作者： Mingsheng Qin Ziqi Zeng Qiang Wu Xiaowei liu qijun liu Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Ethylene carbonate(EC)is susceptible to the aggressive chemistry of nickel-rich cathodes,making it undesirable for high-voltage lithium-ion batteries(LIBs).The arbitrary elimination of EC leads to better oxidative tolerance but always incurs interfacial degradation and electrolyte ***,an EC-free electrolyte is deliberately developed based on gradient solvation by pairing solvation-protection agent(1,3,5-trifluorobenzene,F_(3)B)with propylene carbonate(PC)/methyl ethyl carbonate(EMC)formulation.F_(3)B keeps out of inner coordination shell but decomposes preferentially to construct robust interphase,inhibiting solvent decomposition and electrode ***,the optimized electrolyte(1.1 M)with wide liquid range(-70–77℃)conveys decent interfacial compatibility and high-voltage stability(4.6 V for LiNi_(0.6)Mn_(0.2)Co_(0.2)O_(2),NCM622),qualifying reliable operation of practical NCM/graphite pouch cell(81.1%capacity retention over 600 cycles at 0.5 C).The solvation preservation and interface protection from F_(3)B blaze a new avenue for developing high-voltage electrolytes in next-generation LIBs.

关键词： Lithium-ion batteries Solvation structure High-voltage electrolyte Wide-temperature range Interfacial chemistry

Evolution of molecular structure of TATB under shock loading from transient Raman spectroscopic technique

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Defence Technology（防务技术） 2024年第3期33卷 613-620页

作者： Hongliang Kang Xue Yang Wenshuo Yuan Lei Yang Xinghan Li Fusheng liu Zhengtang liu qijun liu Bond and Band Engineering Group School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

By combination of the transient Raman spectroscopic measurement and the density functional theoretical calculations,the structural evolution and stability of TATB under shock compression was *** to the improvement in synchronization control between two-stage light gas gun and the transient Raman spectra acquisition,as well as the sample preparation,the Raman peak of the N-O mode of TATB was firstly observed under shock pressure up to 13.6 GPa,noticeably higher than the upper limit of 8.5 GPa reported in available *** taking into account of the continuous shift of the main peak and other observed Raman peaks,we did not distinguish any structural transition or any new ***,both the present Raman spectra and the time-resolved radiation of TATB during shock loading showed that TATB exhibits higher chemical stability than previous *** reveal the detailed structural response and evolution of TATB under compression,the density functional theoretical calculations were conducted,and it was found that the pressure make N-O bond lengths shorter,nitro bond angles larger,and intermolecular and intra-molecular hydrogen bond interactions *** observed red shift of Raman peak was ascribed to the abnormal enhancement of H-bound effect on the scissor vibration mode of the nitro group.

关键词： TATB Raman spectra Structural evolution Shock loading

Simulation Study of Cloud Properties Affected by Heterogeneous Nucleation Using the GRAPES＿SCM during the TWP-ICE Campaign

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Journal of Meteorological Research 2019年第4期33卷 734-746页

作者： Zhe LI qijun liu Zhanshan MA Jiong CHEN Qingu JIANG National Meteorological Center China Meteorological AdministrationBeijing 100081 Numerical Weather Prediction Center of China Meteorological Administration Beijing 100081 College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875

This study used the Global/Regional Assimilation and PrEdiction System Single-Column Model(GRAPES_SCM)to simulate monsoon precipitation with deep convective cloud and associated cirrus during the Tropical Warm Pool International Cloud Experiment(TWP-ICE),especially during the active and suppressed monsoon *** cases with different heterogeneous nucleation parameterizations were simulated by using the ensemble *** simulations clearly separated the active and suppressed monsoon periods,and they reproduced the major characteristics of monsoonal cloud such as the total cloud hydrometeor mixing ratio distribution,and precipitation and radiation *** results showed that the number concentration production rate of different heterogeneous nucleation parameterizations varied substantially under the given temperature and water vapor mixing ***,ice formation and precipitation during the monsoon period were affected only slightly by the different heterogeneous nucleation *** study also captured clear competition between different ice formation processes.

关键词： liuma microphysics scheme monsoon precipitation cloud microphysics heterogeneous nucleation GRAPES_SCM

Influence of demodulation bandwidth on demodulation spectrum of ship radiated noise

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Chinese Journal of Acoustics 2019年第4期38卷 445-458页

作者： CHENG Yusheng WANG Sen DING Chao liu qijun Navy Submarine Academy

A mathematical model of amplitude-modulated ship radiated broadband noise signal is established making use of the principle of Fourier decomposition,and a mathematical expression for demodulation spectrum of ship radiated noise is derived by the square demodulation *** two following new conclusions from analysis of the demodulation spectrum are obtained by means of theoretical analysis and simulation calculation:(1) the relationship between demodulation performance and demodulation processing bandwidth:when the modulation depths of different frequency bands of ship radiated noise received by the sonar are equal,the demodulation performance is positively proportional to bandwidth of the band-pass filter used for demodulation,and the wider the band-pass filter bandwidth is,the higher the signalto-noise ratio(SNR) of the demodulation spectrum is;(2) the relationship between broadband demodulation spectrum and sub-band demodulation spectrum:the broadband demodulation spectrum of the ship radiated noise can be approximately regarded as a sum of different subband demodulation *** order to verify the two conclusions above,the demodulation spectrum of actual ship radiated noise is processed correspondingly,and the result is consistent with the simulation.

关键词： spectrum conclusions verify

Measurement on the Harmony Coefficient of Agro-eco-economic System in the Arid Region

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Asian Agricultural Research 2016年第8期8卷 47-52页

作者： qijun liu Zhaonan LI School of Economics Beifang University of Nationalities

On the basis of the present research progress of ecological agriculture,we take Minle County and Linze County located in the middle reaches of Heihe River as the typical research *** on the rural social and economic data during the period of 2000-2010,theory and method of mathematical statistics are used to establish the measure theory and model of agro-eco-economic system harmony coefficient,including efficacy function,function of harmony coefficient,harmony coefficient and level of harmony *** on the actual situation of research region,evaluation indicator system of agro-eco-economic system is established and measurement is carried *** show that the regional agro-eco-economic system in research region was in a serious imbalance in *** harmony coefficient of Minle showed a slight rise from 2000 to 2004,and then presented a fluctuating *** rank of harmony coefficient experienced serious imbalance-extreme imbalance-moderate imbalance-low imbalance-serious imbalance-high *** the same time,the similar tendency happened in Linze *** measuring results of subsystem in 2000-2013 further indicated that except that the harmony coefficient of economic subsystem in Minle County and Linze County was moderate and high,the ecological subsystem was at Level II and Level III,and social subsystem was at Level IV and Level III,in high and low imbalance ***,several recommendations were put forward for optimizing agro-eco-economic system.

关键词： Middle reaches of Heihe River Agro-ecosystem Harmony coefficient

A First-Principles Study of Structural, Elastic and Electronic Properties of Nitromethane

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A First-Principles Study of Structural, Elastic and Electron...

First-principles study on the mechanical properties and thermodynamic properties of Mo-Ta alloys

第十八届中国高压科学学术会议

作者：钟汨 qijun liu Fusheng liu Institute of High Temperature and High Pressure Physics in Southwest Jiaotong University

A first-principle study of solid nitromethane(NM) based on the density function(DFT) theory to investigate the structural, elastic, and electronic properties from 0 GPa to 30 GPa was investigated in this work. The calculated lattice parameters using GGA-PBE-G better agreed with the experimental values than other functional. Furthermore, Bond lengths and bond angles were calculated to investigate the specific changes in the molecular under different pressures, which found that there existed only little change on the intramolecular geometry. And the elastic constants were also discussed to study the mechanical properties in this work. And band gap as the criteria to the stability of the solid NM was also ***, the bond populations were calculated to know more about the bonding situation.

关键词： Energetic Materials NM DFT Pressure

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Plasma Science and Technology 2020年第6期22卷 180-187页

作者： Xin ZHANG Heng LI Yuhong XU qijun liu Yangyang liu Zilin CUI Haifeng liu Xianqu WANG Jie HUANG Hai liu Jun CHENG Ming LI Shaofei GENG Changjian TANG Guangjiu LEI Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China School of Physical Science and Technology Southwest Jiaotong UniversityKey Laboratory of Advanced Technologies of MaterialsMinistry of Education of ChinaChengdu 610031People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China School of Physical Science and Technology Sichuan UniversityChengdu 610065People's Republic of China

The mechanical properties,thermodynamic properties and electronic structure of Mo1-xTax(Mo-Ta)alloys(x=0,0.0625,0.125,0.25,0.3125,0.5 and 1)were calculated by using *** electronic structure of Mo-Ta alloys was analysed by the projected density of states(PDOS).The low temperature heat capacity was estimated by Fermi energy and Debye *** is shown that the formation enthalpy will decrease with the increase of Ta content,and the cohesive energy will increase with the increase of the Ta *** the other hand,the addition of Ta atoms will reduce the strength and improve the ductility of Mo-Ta alloys,the Debye temperature will decrease and the low temperature heat capacity will be improved with the increase of the Ta *** these results will be useful for the research of new plasma grid(PG)materials,which is mainly used in neutral beam injection(NBI)systems to produce negative hydrogen ions.

关键词： first principles calculations Mo-Ta alloy mechanical properties thermodynamic

Genetic variation of Porphyra yezoensis by using AFLP1

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Acta Oceanologica Sinica 2003年第3期22卷 453-457页

作者： Rui Yang, Biqian liu, qijun Luo, Yajun Wang, Jiamei Bao Marine Biotechnology Institution, Ningbo University,Ningbo 315211,China.E-mail:yangrui @ *** Marine Biotechnology Institution Ningbo University Ningbo 315211 China

Genetic variation of 11 lines of Porphyra yezoensis from the coastline of Kagoshima of Japan, Qingdao, Nantong, Putuo and Nanji Islands of China were studied by using amplified fragment length polymorphism (AFLP). 778 bands were obtained with AFLP analysis of 16 primer combinations, among which 15 were unique, about 98.07% were polymorphic. The AFLP data showed that the closest genetic distance was 0 - 180 between two Kagoshima samples, and the farthest one was 0.397 between Kagoshima No. 1 and Nantong No - 9 line. The genetic distance showed that the variation was within the inner species scope. Neighbor-joining cluster and UPGMA cluster indicated that samples from Kagoshima and Qingdao were with high similarity and either with the samples of Nantong, Putuo and Nanji Islands. P. yezoensis in China shared high genetic diversity, and the genetic distance showed positive correlation with the geographic distance.

关键词： Porphyra yezoensis AFLP genetic variation