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Liquid phase in-situ synthesis of LiF coated boron powder composite and performance study

Defence Technology（防务技术） 2020年第3期16卷 635-641页

作者： Yang Xu qing-zhong cui Cheng-wen Zhao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Shanxi Jiangyang Chemical Factory Shanxi 030000China

Among practical metal additives,boron(B) has a high volumetric heating value,making it a promising choice as a fuel *** B can theoretically yield a large amount of energy upon complete combustion,its combustion is retarded by the initial presence of B oxide,which coats the surfaces of B *** improve the ignition and combustion properties of B powder,LiOH and NH4F were used as precursors to synthesize uniformly LiF-coated B composites(LiF-B) in *** LiF-B mixture was also prepared for comparison using a physical method.X-ray diffraction(XRD),Fourier-transform infrared(FTIR),scanning electron microscope(SEM),and energy-dispersive X-ray spectroscopy(EDS) were used to characterize the morphologies and compositions of the *** thermal and combustion properties of the samples were characterized by thermal gravity-differential thermal gravity(TG-DTG),differential scanning calo rimetry(DSC) and closed bomb *** XRD,FTIR,SEM and EDS results demonstrated the successful preparation of the coated LiF-B *** TG-DTG and closed bomb experiment results indicated that the addition of LiF decreased the ignition temperature of B powder,and increasing its reaction *** results show that when LiF-B was added,the released heat of underwater explosive increased by 6727.2,7280.4 and 3109.6 J/g at heating rates of 5,10,and 15℃/min,***,LiF-B decreased the activation energy of secondary combustion reaction of explosive system as calculated through Kissinger’s method by 28.9%,which indicated an excellent catalytic effect for the thermal decomposition of underwater *** results reveal that LiF can improve the combustion efficiency of B powder,thereby increasing the total energy of *** mechanical sensitivity increased slightly after adding LiF-B to the underwater *** mpared to the underwater explosive with added B,the mechanical sensitivity of the explosive with added LiF-B was significantly

关键词： Boron LiF Coating Thermal decomposition properties Energy efficiency

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An Alternating Iterative Method and Its Application in Statistical Inference

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Acta Mathematica Sinica,English Series 2008年第5期24卷 843-856页

作者： Ning Zhong SHI Guo Rong HU qing cui Key Laboratory for Applied Statistics of MOE and School of Mathematics and Statistics Northeast No~nal University Changchun 130024 P. R. China Department of Basic Courses Shijiazhuang Railway Institute Shijiazhuang 050043 P. R. China

This paper studies non-convex programming problems. It is known that, in statistical inference, many constrained estimation problems may be expressed as convex programming problems. However, in many practical problems, the objective functions are not convex. In this paper, we give a definition of a semi-convex objective function and discuss the corresponding non-convex programming problems. A two-step iterative algorithm called the alternating iterative method is proposed for finding solutions for such problems. The method is illustrated by three examples in constrained estimation problems given in Sasabuchi et al. （Biometrika, 72, 465472 （1983））, Shi N. Z. （J. Multivariate Anal., 50, 282-293 （1994）） and El Barmi H. and Dykstra R. （Ann. Statist., 26, 1878 1893 （1998））.

关键词： semi-convex function alternating iterative method accumulation point maximum likelihood estimation order restriction

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Effect of acid phosphatase produced by Trichoderma asperellum Q1 on growth of Arabidopsis under salt stress

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Journal of Integrative Agriculture 2017年第6期16卷 1341-1346页

作者： ZHAO Lei LIU Qun ZHANG Ya-qing cui qing-yu LIANG Yuan-cun Institute of Environment and Ecology Shandong Normal University Jinan 250014 P.R. China College of Life Science Shandong Normal University Jinan 250014 P.R. China College of Plant Protection Shandong Agricultural University Tai'an 271018 P.R. China

Salt stress is a major environmental factor that inhibits crop *** *** the most efficient biocontrol fungi and some of the strains can stimulate plant *** solubilization is known as one of the main mechanisms in promoting plant growth,but the underlying mechanisms of phosphate solubilization in the salinity still need to be *** Trichoderma asperellum Q1 isolated and identified in our lab is a beneficial rhizosphere biocontrol fungus with a high phosphate solubilization *** could produce acid and alkaline phosphatases when using insoluble organic phosphorus as the sole phosphorus source,the salt stress increased the phosphorus-solubilization ability of the strain and the activities of the two ***,an acid phosphatase was purified from the fermentation broth by ammonium sulphate precipitation,ion-exchange,and gel filtration *** molecular weight was 55 k Da as determined by *** purified acid phosphatase was used to investigate growth performance of Arabidopsis thaliana by plate assay and the result showed that it contributed to Arabidopsis growth by transforming organic phosphate into a soluble inorganic form under salt *** our knowledge,this is the first report on acid phosphatase purification from *** and its function in regulation of plant growth under salt stress.

关键词： Trichoderma asperellum Arabidopsis thaliana acid phosphatase plant-growth promotion salt stress

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Second order optimality conditions for the Bolza endpoint constraint control problem evolved on a Riemannian manifold 36

Second order optimality conditions for the Bolza endpoint co...

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第36届中国控制会议

作者： qing cui Li Deng Xu Zhang School of Mathematics Southwest Jiaotong University School of Mathematics Sichuan University

ISBN: (纸本)9781538629185

In this paper, we derive some second order necessary and sufficient conditions of optimal controls for a general control system on a Riemannian manifold. In our control problem, the endpoint is fixed and the control set is open in a Euclidian *** curvature tensor of the manifold appears explicitly in our results. One of our optimality conditions can be used to recover the following famous geometry result:The shortest geodesic connecting two fixed points on a Riemannian manifold must satisfy the second variation of energy.

关键词： manifold second order optimality condition fixed endpoint

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Group tracking control of second-order multi-agent systems 36

Group tracking control of second-order multi-agent systems

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第36届中国控制会议

作者： Lin Shi qing cui Dongmei Xie Department of Mathematics Tianjin University

ISBN: (纸本)9781538629185

This paper focuses on studying the group consensus tracking issue of discrete time second-order multi-agent systems（MASs） under directed fixed and Markovian switching topologies, respectively. For MASs with m leaders, we first introduce a method to divide the whole MASs into m subgroups. Based on the subgroup-divided method, the condensation directed graph G of the communication topology of the whole MASs becomes a directed acyclic graph（DAG）. Then, for MASs with fixed/Markovian switching topology, some sufficient/necessary and sufficient group consensus tracking criteria are established.

关键词： Multi-agent systems(MASs) subgroup-divided method group tracking Markovian switching topologies

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An efficient one-pot synthesis of thiophene-fused pyrido[3,2-a]azulenes via Gewald reaction

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Chinese Chemical Letters 2014年第12期25卷 1591-1594页

作者： Dao-Lin Wang Jian-Ying Wu qing-Tao cui College of Chemistry and Chemical Engineering Liaoning Key Laboratory of Synthesis and Application of Functional CompoundBohai University

A simple and efficient procedure was developed for the synthesis of 11H（2H）-4-oxothiophene[3＇,4＇：6,5]pyrido[3,2-a]azulene-10-carboxylates（3） in moderate to good yields via the Gewald reaction of ethyl 1-cyanoacetyl-2-methoxyazulene-3-carboxylate（1） with carbonyl compounds（2） and elemental sulfur utilizing imidazole as *** reaction provides a new procedure for synthesis of pyridinone-fused azulenes.

关键词： Azulene Thiophene Pyridinone Gewald reaction

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Splitting Rolling Simulated by Reproducing Kernel Particle Method

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Journal of Iron and Steel Research International 2007年第3期14卷 42-46页

作者： cui qing-ling LIU Xiang-hua WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

During splitting rolling simulation, re-meshing is necessary to prevent the effect of severe mesh distortion when the conventional finite element method is used. However, extreme deformation cannot be solved by the finite element method in splitting rolling. The reproducing kernel particle method can solve this problem because the continuum body is discretized by a set of nodes, and a finite element mesh is unnecessary, and there is no explicit limitation of mesh when the metal is split. To ensure stability in the large deformation elastoplastic analysis, the Lagrange material shape function was introduced. The transformation method was utilized to impose the essential boundary conditions. The splitting rolling method was simulated and the simulation results were in accordance with the experimental ones in the literature.

关键词： elasto-plasticity large deformation reproducing kernel particle method splitting rolling

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Nonlinear Variability Observed with Insight-HXMT in MAXI J1820+070 and MAXI J1535-571

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Research in Astronomy and Astrophysics 2023年第8期23卷 346-354页

作者： Qi Ding Long Ji qing-cui Bu Tiekuang Dong Jin Chang Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210033China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519000China Institut für Astronomie und Astrophysik Kepler Center for Astro and Particle PhysicsEberhard KarlsUniversitätSand 1D-72076 TübingenGermany National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

We present the timing analysis of the nonlinear variability in two black hole low mass X-ray binaries MAXI J1820+070 and MAXI J1535-571 by using the bicoherence,a measure of phase coupling at different Fourier *** found different patterns,e.g.,“cross”and“hypotenuse,”for LFQPOs in different outburst *** they can be clearly distinguished,bicoherence patterns are similar over a wide energy range of 1–100 *** is intriguing that in some type-C QPOs we found the patterns that are normally observed in type-B *** the contrary,the“hypotenuse”pattern,a characteristic of type-C QPOs,was detected in a type-B *** suggests that different types of QPOs may originate from similar underlying *** addition,we speculate that the nonlinear variability may be a promising approach to disentangle distinct QPO models which assume different interactions between the broadband noise and QPO components.

关键词： black hole physics-instrumentation detectors-methods data analysis-X-rays binaries

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CONTINUOUS IMPROVEMENT THROUGH INTEGRATION OF QUALITY TOOLS

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Chinese Journal of Mechanical Engineering 2006年第1期19卷 72-75页

作者： HE Zhen ZOU Feng cui qing＇an QI Ershi LlU Zixian School of Management Tianjin University Tianjin 300072 China

The relationship between major quality tools such as quality function development （QFD）, failure mode and effects analysis （FMEA）, design of experiments （DOE） and statistical process control （SPC） is analyzed through an extensive review of the literature and the concurrent quality engineering philosophy, and a basic structure for the integration of quality tools is presented. An integrated quality management system （IQMS） is developed using C＋＋ Builder, running in the Windows 2000 Server environment with the basic internet connections, and SQL Server 2000 as the platform for developing the database, An illustrative example applying IQMS to the continuous quality improvement for a crane equipment manufacturing is reported. The result shows that the application of IQMS can optimize the process of design and manufacturing, shorten the cycle time of product, reduce the cost, and realize quality improvement continuously, The proposed integrated framework with IOMS is believed to be applicable to continuous quality improvement in many manufacturing companies.

关键词： Concurrent quality engineering Integration of quality Continuous improvement Integrated quality management system (IQMS)

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The new synthesis of sesquiterpenoids 10-bromo-α-chamigrene

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Chinese Chemical Letters 2009年第5期20卷 554-556页

作者： qing cui Lin Kang Hai Shen Yang Xiao Hua Xu State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China

The new synthesis of 10-bromo-α-chamigrene was achieved as follows; 6-methyl-5-heptene-2-one was transformed into corresponding thioacetals, and then successively treated with Cp2Ti（P（OEt）3）2. The intermediate reacted with mono-ketal of cyclohexane-1,4-dione, and gave the carbonyl coupling product. It was then transformed into the key intermediate γ-bisabolene via deketalization, Grignard reaction, dehydration and then furnished the target molecule by polyene cyclization, with total yield 2%. All structures were confirmed by ^1H NMR and ^13C NMR. The final compound was confirmed by ^1H NMR, ^13C NMR and MS.

关键词： 10-Bromo-α-chamigrene Halogenated sesquiterpenoids Carbonyl coupling Synthesis

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