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Flight parameter calculation method of multi-projectiles using temporal and spatial information constraint

Defence Technology（防务技术） 2023年第1期19卷 63-75页

作者： han-shan Li Xiao-qian Zhang School of Electronic and Information Engineering Xi'an Technological UniversityXi'an710021China

The dynamic parameters of multiple projectiles that are fired using multi-barrel weapons in highfrequency continuous firing modes are important indicators to measure the performance of these *** characteristics of multiple projectiles are high randomness and large numbers launched in a short period of time,making it very difficult to obtain the real dispersion parameters of the projectiles due to the occlusion or coincidence of multiple *** six intersecting-screen testing system,in this paper,we propose an association recognition and matching algorithm of multiple projectiles using a temporal and spatial information constraint *** extract the output signal from each detection screen and then use the wavelet transform to process the output *** present a method to identify and extract the time values on which the projectiles pass through the detection screens using the wavelet transform modulus maximum *** then use the correlation of the output signals of three parallel detection screens to establish a correlation coefficient recognition constraint function for the multiple *** on the premise of linear projectile motion,we establish a temporal and spatial constraint matching model using the projectile’s position coordinates in each detection screen and the projectile’s time constraints within the multiple intersecting-screen *** then determine the time values of the multiple projectiles in each detection screen using an iterative search cycle registration,and finally obtain the flight parameters for the multiple projectiles in the presence of *** proposed method and algorithm were verified experimentally and can solve the problem of uncertainty in projectiles flight parameter under different multiple projectile firing states.

关键词： Six detection screen array Multi-projectile Recognition and matching Temporal and spatial information constraint Wavelet transform

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Small Things Make a Big Difference: the Small-molecule Cross-linker of Robust Water-soluble Network Binders for Stable Si Anodes

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Chemical Research in Chinese Universities 2021年第2期37卷 304-310页

作者： wang Dong LI Zhenwei ZhanG qian LIU Jie YANG Yu han Jishu wang Lei State Key Laboratory Base of Eco-chemical Engineering Taishan Scholar Advantage and Characteristic Discipline Team of Eco-chemical Process and TechnologyQingdao University of Science and TechnologyQingdao266042P.R.China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao266042P.R.China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao266042P.R.China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao266042P.R.China

Silicon(Si)with high theoretical capacity has attracted tremendous attention as the next-generation anode material for Li-ion batteries,but the huge expansion during cycling restricts its practical *** a low-cost,accessible robust network binder is a facile and effective approach to suppress the volume change effect and achieve the commercial application of Si *** previous studies focused on the network binder macromolecule main chain,this manuscript pays attention to the study of small-molecule ***,cross-linked network binders using alginate acid and two kinds of cross-linkers,i.e.,D-sorbitol and isosorbide(Alg-DS and Alg-IS binders)are *** was found that not only the chemical structure of the cross-linker but also the physicochemical property,such as melting point affect greatly the mechanical properties of the network *** a result,the Si anode with an Alg-DS binder dried below the melting point of DS shows the best cycling stability with a high capacity of 2249.8 mA·h/g and a retention rate as high as 95.9%after 100 *** study gives a new view to design robust network binders for stable Si anodes.

关键词： Li-ion battery Si anode Network binder Cross-linker

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Transformation of CO2 and H2 to C2+ chemicals and fuels

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National Science Review 2023年第9期10卷 17-19页

作者： Qingli qian Buxing han Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics CAS Research/Education Center for Excellence in Molecular Sciences Center for Carbon Neutral Chemistry Institute of ChemistryChinese Academy of Sciences 2. Physical Science Laboratory Huairou National Comprehensive Science Center School of Chemistry and Chemical Engineering University of Chinese Academy of Sciences Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University

CO2is a greenhouse gas,and is also a cheap,easily available and renewable carbon *** of CO2into chemicals has been extensively investigated in the forms of thermo catalysis,electrocatalysis and photo ***2is the highes...

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Global Existence and Blow-up for Semilinear Wave Equations with Variable Coefficients

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Chinese Annals of Mathematics,Series B 2018年第4期39卷 643-664页

作者： qian LEI han YANG School of Mathematics Southwest Jiaotong University Chengdu 610031 China School of Transportation and Logistics Southwest Jiaotong University Chengdu 610031 China

The authors consider the critical exponent problem for the variable coefficients wave equation with a space dependent potential and source term. For sufficiently small data with compact support, if the power of nonlinearity is larger than the expected exponent, it is proved that there exists a global solution. Furthermore, the precise decay estimates for the energy, L^2 and L^(p+1) norms of solutions are also established. In addition, the blow-up of the solutions is proved for arbitrary initial data with compact support when the power of nonlinearity is less than some constant.

关键词： Semilinear wave equations Global existence Energy decay L^2 and L^p+1 estimates Blow up

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Intraoperative care of elderly patients with COVID-19 undergoing double lung transplantation:Two case reports

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World Journal of Clinical Cases 2020年第22期8卷 5765-5772页

作者： Qi Wu Ying wang han-qian Chen Hui Pan Operating Room The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina Department of Lung Transplantation Surgery The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Lung transplantation is considered an effective method for treating patients with end-stage coronavirus disease 2019(COVID-19).The nurses play a pivotal role in lung transplantation for COVID-19 *** SUMMARY Two elderly patients were admitted to the emergency department due to cough,and the nucleic acid test was *** patients were preliminarily diagnosed with *** chest computed tomography scan revealed massive lung consolidation,and the patients did not improve after treatment with antiviral drugs,glucocorticoids,antibiotics,and other *** the support of pure oxygen in extracorporeal membrane oxygenation,the patients’oxygen levels were still poor,indicating that they were in the terminal stage of viral *** patients underwent double-lung transplantation and received intraoperative *** extracorporeal membrane oxygenation device was removed within a week of the surgical procedure,and the respiratory circulation of the patients were *** High-quality care for COVID-19 patients undergoing lung transplantation ensures patient safety during operation while protecting the safety of the medical staff.

关键词： Lung transplantation Extracorporeal membrane oxygenation COVID-19 Intraoperative care Third-level protection Case report

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A physical approach of the short-term wind power prediction based on CFD pre-calculated flow fields

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Journal of Hydrodynamics 2013年第1期25卷 56-61页

作者： LI Li LIU Yong-qian YANG Yong-ping han Shuang wang Yi-mei State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University School of Energy and Power Engineering Shandong University

A physical approach of the wind power prediction based on the CFD pre-calculated flow fields is proposed in this paper. The flow fields are obtained based on a steady CFD model with the discrete inflow wind conditions as the boundary conditions, and a database is established containing the important parameters including the inflow wind conditions, the flow fields and the corresponding wind power for each wind turbine. The power is predicted via the database by taking the Numerical Weather Prediction （NWP） wind as the input data. In order to evaluate the approach, the short-term wind power prediction for an actual wind farm is conducted as an example during the period of the year 2010. Compared with the measured power, the predicted results enjoy a high accuracy with the annual Root Mean Square Error （RMSE） of 15.2% and the annual MAE of 10.80%. A good performance is shown in predicting the wind power＇s changing trend. This approach is independent of the historical data and can be widely used for all kinds of wind farms including the newly-built wind farms. At the same time, it does not take much computation time while it captures the local air flows more precisely by the CFD model. So it is especially practical for engineering projects.

关键词： short-term wind power prediction physical approach CFD model flow field database

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One-step synthesis of novel core-shell bimetallic hexacyanoferrate for high performance sodium-storage cathode

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Journal of Materials Science & Technology 2022年第19期114卷 180-190页

作者： Daxian Zuo Cuiping wang Jiajia han Qinghao han Yanan Hu Junwei Wu Huajun Qiu qian Zhang Xingjun Liu College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials Xiamen UniversityXiamen 361005China Institute of Materials Genome and Big Data Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China

Recently, the design of core-shell hierarchical architecture plays an important role in improving the electrochemical performance of Prussian blue analogue cathodes(PBAs). Unfortunately, the inconvenient stepwise preparation and the strict lattice-matching requirement have restricted the development of coreshell PBAs. Herein, we demonstrate a one-step synthesis strategy to synthesize core-shell manganese hexacyanoferrate(MnFeHCF@MnFeHCF) for the first time. And the formation mechanism of the core-shell hierarchical architecture is investigated by first-principles calculations. It is found that the as-obtained Mn FeHCF@MnFeHCF act out the superior intrinsic natures, which not only can obtain a larger specific surface area and lower Fe(CN)_(6) vacancies but also can activate more Na-storage sites. Compared with the manganese hexacyanoferrate(MnHCF), the iron hexacyanoferrate(FeHCF), and even the traditional coreshell nickel hexacyanoferrate(FeHCF@NiHCF) prepared by a stepwise method, the Mn Fe HCF@MnFeHCF demonstrates a superior rate performance, which achieves a high capacity of 131 mAh g^(−1) at 50 mA g^(−1) and delivers a considerable discharge capacity of about 100 mAh g^(−1) even at 1600 mA g^(−1). Meantime, the capacity retention can reach up to nearly 80% after 500 cycles. The improved performances could be mainly originated from two aspects: on the one hand, Mn substitution is helpful to enhance the material conductivity;on the other hand, the core-shell structure with matched lattice parameters is more favorable to enhance the diffusion coefficient of sodium ions. Beside, the structural transformation of MnFeHCF@MnFeHCF upon the extraction/insertion of sodium ions is instrumental in releasing the interior stress and effectively maintaining the integrity of the crystal structure.

关键词： Cathode Prussian blue analogue Core-shell structure First-principles calculations Electrochemical performance

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Design and Wave Propagation Characterization of Starchiral Metamaterials

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Acta Mechanica Solida Sinica 2022年第2期35卷 215-227页

作者： Yajun Xin han wang Cong wang Jinxin Yao qian Ding Haoqiang Gao Shuliang Cheng Yongtao Sun Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province Yanshan UniversityQinhuangdao 060000China Hebei Province Low-Carbon and Clean Building Heating Technology Innovation Center Yanshan UniversityQinhuangdao 060000China Department of Mechanics and Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin UniversityTianjin 300072China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Metamaterials with simple artificial topological properties made from industrially produced single-phase materials have extraordinary innovation and *** this paper,we investigated wave propagation characteristics of a hexastarchiral lattice metamaterial with periodic assemblies and used the finite element(FE)method to study the band gap ***,in order to understand the mechanism of band gaps,we discussed the mode shapes of unit cells and found that the bending of the ligament and the overall rotation have a high correlation with the generation of omnidirectional band *** relationships bet ween geometric parameters and band gap properties have also been systematically studied,which demonstrated that the band gaps of the proposed metamaterial could be reasonably predicted through the evolution of geometric ***,the transmission characteristics of finite sandwich panel structures composed of periodic unit cells were calculated to verify the correctness of the band gap simulation results,which proved that the proposed artificial metastructure has potential application value in vibration and noise reduction projects.

关键词： Hexastarchiral lattice metamaterials Band gap properties Finite element method Rotational resonance

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Microstructure and Mechanical Properties of Nb- and Nb+ Ti-Stabilised 18Cr-2Mo Ferritic Stainless Steels

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 716-730页

作者： Jian han Zhixiong Zhu Gang Wei Xingxu Jiang qian wang Yangchuan Cai Zhengyi Jiang School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China School of Mechanical Engineering and Automation University of Science and Technology LiaoningAnshan 114051China

To explore the optimum use of stabilised elements and study the influences of stabilisation in 18 Cr-2 Mo grades,the Nb and Nb+Ti microalloying investigation focused on the relationships of the microstructure and mechanical properties of the microalloyed 18 Cr-2 Mo ferritic stainless steel thick ***-Calc calculation was performed to predict the equilibrium phase ***,the microstructure,*** size and precipitation,of as-annealed specimens was analysed by means of optical microscopy,scanning electron microscopy and transmission electron microscopy,X-ray diffraction and energydispersive ***,electron backscatter diffraction mapping was constructed to characterise grain *** mechanical properties,including tensile strength and impact toughness,were tested to correlate with the *** results show that the grain sizes of Nb-stabilised steel are comparatively smaller,which is related to the fine precipitation at the grain boundaries and beneficial to the impact *** increase in its strength is not apparent due to the inhomogeneous grain *** grain boundary characters are similar,which is not the main factor related to their mechanical *** Ti is added,TiN forms above the liquidus,and large TiN particles evidently impair impact toughness.

关键词： Ferritic stainless steels Toughness Precipitation Microstructure

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Aggregation-Induced Emission:A Rising Star in Chemistry and Materials Science

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Chinese Journal of Chemistry 2021年第3期39卷 677-689页

作者： Ting han Dingyuan Yan qian Wu Nan Song Haoke Zhang Dong wang Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhenGuangdong 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhenGuangdong 518060China Department of Chemistry The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Aggregation-induced emission(AIE)refers to a photophysical effect that the luminescence of aggregates is stronger than that of the dispersed *** the concept of AIE was coined by Professor Ben Zhong Tang and co-workers in 2001,AIE has evolved from a simple luminescent phenomenon to a multidisciplinary research field with a widespread *** has changed people's way of thinking about chromophore aggregation and greatly promoted the development of advanced luminescent *** the 20-year development,diverse AIE luminogens(AlEgens)with attractive functionalities have been developed and remarkable achievements have been made in the mechanistic study and high-tech applications of *** this review,we provide an overview of the historical development and representative achievements of AIE *** on the application of AIE in aggregate science are also briefly discussed to guide the future development in this field.

关键词： Aggregation-induced emission Fluorescence Materials science Structures Mechanisms

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