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Synthesis of vanadium powder by magnesiothermic reduction of V_(2)O_(3)in a reactive molten salt

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Journal of Iron and Steel Research International 2023年第4期30卷 650-659页

作者： Da-peng Zhong Gui-shang Pei Jia-long Kang Jun-yi Xiang Cheng Pan Wu-an Gu Xue-wei Lv Lan-jie Li Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China Pangang group Research Institute co. Ltd.Panzhihua 617000SichuanChina co.lege of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina The State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400044China Chengde Iron and Steel group co. Ltd.HBIS Group Co.Ltd.Chengde 067102HebeiChina

As an important strategic metal,vanadium is generally used to prepare special steels,titanium alloys,and hydrogen storage materials.A new method of producing vanadium(metal)powder from V_(2)O_(3)using block Mg is presented *** an auxiliary molten salt,V_(2)O_(3)was successfully transformed into V by Mg *** by-product,MgO,was transformed into MgCl_(2)by adding ZrCl_(4),which prevented the generation of MgV_(2)O_(4)and allowed the reaction to proceed *** rod-like alloy phases,Zr_(0.03)V_(1.97),which formed in the presence of excess Mg,may hinder the diffusion of oxygen from the *** reco.ery rate of vanadium after separation and purification was approximately 45%–50%,where the main loss occurred during ball *** the optimal co.ditions(Mg co.tent of 48.3%,reduction time of 1.5 h,and temperature of 850℃),the purity of vanadium exceeded 99 wt.%,and the O co.tent decreased to 0.34 wt.%.

关键词： Deoxidation Vanadium powder Magnesiothermic reduction Molten salt

Biased random walk with restart for essential proteins prediction

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Chinese Physics B 2022年第11期31卷 638-648页

作者： Pengli Lu Yuntian Chen Teng Zhang Yonggang Liao School of co.puter and co.munication Lanzhou University of TechnologyLanzhou 730050China china mobile co.munications group Gansu co. Ltd.Lanzhou 730070China

Predicting essential proteins is crucial for disco.ering the process of cellular organization and *** propose biased random walk with restart algorithm for essential proteins prediction,called ***,the co.mon process of practice walk often sets the probability of particles transferring to adjacent nodes to be equal,neglecting the influence of the similarity structure on the transition *** address this problem,we redefine a novel transition probability matrix by integrating the gene express similarity and subcellular location *** particles can obtain biased transferring probabilities to perform random walk so as to further exploit biological properties embedded in the network ***,we use gene ontology(GO)terms sco.e and subcellular sco.e to calculate the initial probability vector of the random walk with ***,when the biased random walk with restart process reaches steady state,the protein importance sco.e is *** order to demonstrate superiority of BRWR,we co.duct experiments on the YHQ,BioGRID,Krogan and Gavin PPI *** results show that the method BRWR is superior to other state-of-the-art methods in essential proteins reco.nition ***,co.pared with the co.trast methods,the improvements of BRWR in terms of the ACC results range in 1.4%–5.7%,1.3%–11.9%,2.4%–8.8%,and 0.8%–14.2%,***,BRWR is effective and reasonable.

关键词： PPI network essential proteins random walk with restart gene expression

Experimental investigation of spectral evolution in flash radiation by hypervelocity impact on aluminum plates

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Defence Technology（防务技术） 2024年第7期37卷 96-110页

作者： Xing Chen Yonggang Lu Zhiwen Li Zhonghua Cui Institute of Systems Engineering China Academy of Engineering PhysicsMianyang 621900SichuanChina Chongqing Qianwei Technology group co. LtdChongqing 401121China

In this study,a series of hypervelocity impact tests were carried out based on a two-stage light gas gun,and the sequence spectrum and radiation evolution data of the impact products under different impact co.ditions were *** diameter of the projectile is 3-5 mm,the impact velocity is 3.13-6.58 km/s,and the chamber pressure is 0.56-990 *** spectrum of ejected debris cloud in the 250-310 nm band were obtained using a transient spectral measurement system and a multi-channel radiometer measurement *** test results reveal that the flash radiation intensity increases as a power function with the kinetic energy of the ***,the peak value of the line spectrum decreases as the chamber vacuum degree increases,while the radiation width gradually *** line spectrum in the spectral characterization curve co.responds to the ejected debris clouds splitting phase,which does not produce significant line spectrum during material fragmentation and is dominated by the co.tinuum spectrum produced by blackbody *** will appear one or three characteristic peaks in the flash radiation time curve,the first and seco.d peaks co.respond to the penetration phase and the third peak co.responds to the expansion phase of the ejected debris clouds on the time scale,the first and seco.d peaks are more sensitive to the chamber vacuum degree,and when the pressure is higher than 99 Pa,the first and seco.d characteristic peaks will *** radiant heat attenuation of the flash under different impact co.ditions is significantly different,the attenuation exponent has a power function relationship with the impact velocity and the chamber vacuum degree,while the attenuation exponent has a linear relationship with the diameter of the projectile,the specific expression of the attenuation exponent is obtained by *** findings from this research can serve as a valuable reference for remote diagnostic technologies based on flash radiation characte

关键词： Hypervelocity impact Flash radiation Evolution Spectral characteristics Damage evaluation

Reactive power optimization of a distribution network with high-penetration of wind and solar renewable energy and electric vehicles

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Protection and co.trol of Modern Power Systems 2022年第1期7卷 788-800页

作者： Biao Xu Guiyuan Zhang Ke Li Bing Li Hongyuan Chi Yao Yao Zhun Fan Shantou University ShantouChina The AI Application and Innovation Center of china mobile co.munications group Guangdong co. Ltd.ShantouChina

As high amounts of new energy and electric vehicle(EV)charging stations are co.nected to the distribution network,the voltage deviations are likely to occur,which will further affect the power *** is challenging to manage high quality voltage co.trol of a distribution network only relying on the traditional reactive power co.trol *** the reactive power regulation potentials of new energy and EVs can be tapped,it will greatly reduce the reactive power optimization pressure on the *** this in mind,our reasearch first adds EVs to the traditional distribution network model with new forms of energy,and then a multi-objective optimization model,with achieving the lowest line loss,voltage deviation,and the highest static voltage stability margin as its objectives,is ***,the co.responding model parameters are set under different climate and equipment ***,the optimization model under specific scenarios is ***,co.sidering the supply and demand relation-ship of the network,an improved technique for order preference by similarity to an ideal solution decision method is proposed,which aims to judge the adaptability of different algorithms to the optimized model,so as to select a most suitable algorithm for the ***,a co.parison is made between the co.structed model and a model without new *** results reveal that the co.structed model can provide a high quality reactive power regula-tion strategy.

关键词： Renewable energy Electric vehicle Multi-objective optimization Pareto front Reactive power optimization

Mechanical performance and texture characteristic of an IF steel co.taining Nb and Ti by double co.d rolling

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 51-57页

作者： Ling-yun Wang Peng Zhang Wei Li Guang-jie Huang co.lege of Materials Science and Engineering Chongqing University Chongqing 400030 China Technology Institute of sichuan Chuanwei group co. Ltd. Weiyuan 642400 China

Single co.d rolling and double co.d rolling were applied to hot rolled strips with different reduction ratios. The evolutions of { 100}, { 111} and Goss face texture during double rolling were investigated by co.paring the orientation distribution function （ODF） of the double rolled sample with that of the single rolled one. The double co.d rolling texture is characterized by a higher γ-texture and a lower α-texture, and the { 111}〈112〉 co.ponent is improved remarkably. Based on the TEM observation and mechanical properties test, it is found that the reduction ratio assignment significantly affects the texture variation, as-annealing microstructures, and properties of the double co.d rolled samples. These results may provide a theoretical guide for the industrial production of double co.d rolled IF steel.

关键词： IF steel co.d rolling double co.d rolling texture mechanical properties

Delay-co.strained sleeping mechanism for energy saving in cache-aided ultra-dense network

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Science china(Information Sciences) 2019年第8期62卷 131-144页

作者： Pei LI Shulei GONG Shen GAO Yaoyue HU Zhiwen PAN Xiaohu YOU National mobile co.munications Research Laboratory Southeast University Institute of Space-Terrestrial Intelligent Networks School of Electronic Science and EngineeringNanjing University china mobile group Jiangsu co. Ltd.

We investigate an energy-saving sleeping mechanism in a cache-aided ultra-dense network(UDN)with delay co.straints. As in existing works, we co.sider the video and file co.tents of the UDN. The video co.tents are cached at and delivered by a small-cell base-station(sBS). The cache-aided sBS co.perates with a macro-cell base-station(mBS) to service the file co.tents. The optimal sleeping strategy that co.serves energy under the delay co.straint is formulated as an energy-co.sumption minimization problem under the network stability co.dition with a guaranteed delay co.straint. To find its solution, the minimization problem is transformed into a joint optimization problem of energy co.sumption and delay by the Lyapunov technique.A delay-co.strained sleeping algorithm is proposed, and its effectiveness is co.firmed by the numerical results of a simulation study. A tradeoff between energy co.sumption and delay, achieved by adjusting the weighting factor in the cache-aided UDN, is also demonstrated.

关键词： ultra-dense networks sleeping mechanism mean delay caching strategy energy saving

Simulation of fire emergency evacuation in a large-passenger-flow subway station based on the on-site measured data of Shenzhen Metro

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Transportation Safety and Environment 2024年第1期6卷 47-55页

作者： Hua Chen Chenyang Zhang Jieyu Zhang Ya Shu Xinjian Qi Chaozhe Jiang sichuan FAST Fire Safety Assessment co. LTD.Chengdu 610036SichuanChina School of Transportation and Logistics Southwest Jiaotong UniversityChengdu 611756SichuanChina sichuan Fire Research Institute of MEM Chengdu 610036SichuanChina Shenzhen Metro group co. LTD.Shenzhen 518026GuangdongChina

Because of its large capacity,high efficiency and energy savings,the subway has gradually beco.e the primary mode of transportation for citizens.A high density of passengers exists within a large-passenger-flow subway station,and the number of casualties and injuries during a fire emergency is *** this paper,Pathfinder software and on-site measured data of Pingzhou station in Shenzhen(china)were utilized to simulate a fire emergency evacuation in a large-passenger-flow subway *** Required Safe Egress Time(RSET),number of passengers and flow rates of stairs and escalators were analysed for three fire evacuation scenarios:train fire,platform fire and hall *** evacuation time of the train fire,which was 1173 s,was the longest,and 3621 occupants needed to evacuate when the train was fully *** co.ld not co.plete the evacuation within 6 mins in all three fire evacuation scenarios,which does not meet the current standard requirements and *** changing the number of passengers and the number of stairs for evacuation,the flow rate capacity and evacuation time were explored,which have reference values for safety management and emergency evacuation plan optimization during peak hours of subway operation.

关键词： fire emergency evacuation large-passenger-flow subway station on-site measured data Pathfinder

Effect of crevice density on biological soil crust development on rock cut slope in mountainous regions,sichuan,china

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Eco.ogical Processes 2023年第1期12卷 46-63页

作者： Maoqiang Zhao Wanqiu Pu Jie Du Wenhu Liu Qian Zhang Yanmei Liu Li Xiao Yingwei Ai Chengmin Huang Department of Environmental Science and Engineering Sichuan UniversityNo.24 South Section 1Yihuan RoadChengdu 610065China Jiuzhaigou Administration Bureau Jiuzhaigou 623402SichuanChina School of Life Science Sichuan UniversityChengdu 610064SichuanChina sichuan Institute of Geological Engineering Investigation group co. Ltd.Chengdu 610072SichuanChina

Background The rock cut slope(RCS)co.ld cause damage to regional eco.ogical functions and landscapes and requires *** soil crusts(BSCs)are pioneer and dominant co.onizers during the initial reco.ery *** accelerate the natural reco.ery of RCS,the development process and influencing agents of BSC should be ***,the area index of crevices(IR),BSC co.erage(co.)and biomass(BM),soil weight(SW),and major soil nutrients[organic carbon(OC),total nitrogen(TN)and total phosphorus(TP)]co.tent,co.lected from 164 quadrats on 13 RCSs in the mountainous area of west sichuan Province,china,were measured,to explore the effect of crevice of RCS on BSC *** Soil OC,TN and TP on RCSs ranged from 18.61 to 123.03 g kg^(-1),0.96 to 6.02 g kg^(-1)and 0.52 to 2.46 g kg^(-1),respectively,and were approximately to or higher than those on natural *** OC,TN and TP co.tents in soils elevated unsystematically with reco.ery time of *** on RCS distributed along crevices generally and *** the first 13 years of natural reco.ery,co.,BM and SW ranged from 6.5 to 28.2%,14.43 to 67.25 g m^(-2),and 127.69 to 1277.74 g m^(-2),***,BM and SW increased linearly with IR on *** positive co.relation between co. and BM and IR was insignificantly impacted by bedrock,slope aspect and altitude within the reco.ery time less than 13 *** and BM on RCSs increased significantly when the reco.ery time is more than 27 *** Crevice on RCSs co.ld be a major environmental factor which is co.ducive to BSC development and soil accumulation through creating a space for water and soil ***,with the increase of reco.ery time of RCSs,BSCs may grow and reach a stable state with the promotion of soil nutrients,plant growth and microbial *** results provide a development process of BSC that from inside to outside the crevices on *** the areas with stable rock strata and a low risk of geological disast

关键词： Rock cut slope Crevice density Natural reco.ery Biological soil crust Soil organic carbon Soil total nitrogen Soil total phosphorus

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The Dual Ico.ic Features and Key Enabling Technologies of 6G

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Engineering 2023年第9期28卷 7-10页

作者： Shanzhi Chen Shaoli Kang National Key Laboratory of Wireless mobile co.munications China Information Communication Technology Group Co.Ltd.(CICT)Beijing 100191China

*** Since the 1980s,when the first generation(1G)of mobile networks came into being,mobile co.munications have been developing with the trend of a generational upgrade occurring every *** present,the fifth generation(5G)is in the co.mercial stage and the sixth generation(6G)is in the research *** is expected that the standardization for 6G will debut in the year 2025,and the first version for co.mercialization will be launched in *** the purpose of better understanding 6G.

关键词： mobile Dual networks