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OPTIMAL ALLOCATION FOR ESTIMATING THE CORRELATION COEFFICIENT OF MORGENSTERN TYPE BIVARIATE EXPONENTIAL DISTRIBUTION BY RANKED SET SAMPLING WITH CONCOMITANT VARIABLE

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Journal of Systems Science & Complexity 2013年第2期26卷 249-260页

作者： XIE Minyu XIONG ming wu ming School of Mathematics and Statistics Central China Normal University

Ranked set sample is applicable whenever ranking of a set of sample units can be done easily by a judgement method of the study variable or of the auxiliary variable. This paper considers ranked set sample based on the auxiliary variable X which is correlated with the study variable Y, where （X, Y） follows Morgenstern type bivariate exponential distribution. The authors discuss the optional allocation for unbiased estimators of the correlation coefficient p of the random variables X and Y when the auxiliary variable X is used for ranking the sample units and the study variable Y is measured for estimating the correlation coefficient. This paper first gives a class of unbiased estimators of p when the mean 0 of the study variable Y is known and obtains an essentially complete subclass of this class. Further, the optimal allocation of the unbiased estimators is found in this subclass and is proved to be Bayes, admissible, and minimax. Finally, the unbiased estimator of p under the optimal allocation in the case of known θ is reformed for estimating p in the case of unknown θ, and the reformed estimator is shown to be strongly consistent.

关键词： Concomitants of order statistic Morgenstern type bivariate exponential distribution optimal allocation ranked set sample unbiased estimator.

Integrated guidance and control design for missile with terminal impact angle constraint based on sliding mode control

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Journal of Systems Engineering and Electronics 2010年第4期21卷 623-628页

作者： Peng wu ming Yang Control and Simulation Center Harbin Institute of Technology Harbin 150001 E R. China

Aimed at the guidance requirements of some missiles which attack targets with terminal impact angle at the terminal point,a new integrated guidance and control design scheme based on variable structure control approach for missile with terminal impact angle constraint is ***,a mathematical model of an integrated guidance and control model in pitch plane is established,and then nonlinear transformation is employed to transform the mathematical model into a standard form suitable for sliding mode control method design.A sufficient condition for the existence of linear sliding surface is given in terms of linear matrix inequalities（LMIs）,based on which the corresponding reaching motion controller is also *** verify the effectiveness of the proposed integrated design scheme,the numerical simulation of missile is *** simulation results demonstrate that the proposed guidance and control law can guide missile to hit the target with desired impact angle and desired flight attitude angle simultaneously.

关键词： guidance terminal impact angle sliding mode control integrated guidance and control linear matrix inequality(LMI).

Metapelitic Garnet-Muscovite-Al_2SiO_5-Quartz(GMAQ) Geothermobarometry

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Journal of Earth Science 2018年第5期29卷 977-988页

作者： Chun-ming wu College of Earth and Planetary Sciences University of Chinese Academy of Sciences

The garnet-muscovite geothermometer and garnet-muscovite-Al2SiO5 -quartz （GMAQ） geobarometer have been empirically calibrated under P-T conditions of 1-12 kbar and 460-760 ℃ using natural metapelitic rocks. The chemical compositions of the calibrant muscovite are in the ranges of Fe=0.03-0.21 atoms, Mg=0.02-0.32 atoms and AI VI=1.62-1.96 atoms, respectively, on the ll-oxygen basis per formula unit. The garnet-muscovite thermometer yields similar temperature estimates to the well calibrated garnet-biotite thermometer within error of 4-55 ℃, and successfully discriminates the systematic temperature change of the different zones of either the prograde or inverted metamorphic terranes or thermal contact aureoles. The six formulations of GMAQ barometry yield similar pressure estimates to the well calibrated GASP barometer within error of ±1.2 kbar, and plot the Al2SiOs-bearing metapelite into the correct stability field of the AI2SiOs polymorphs. Moreover, the GMAQ thermobarometers show that the pressure is almost constant for every thermal contact aureole within limited geographic region, which reflects geological condition. The random errors are estimated to be of ca. 4-60 ℃ and 4-1.4 kbar for the geothermometer and geobarometer, respectively. A spreadsheet for applying GMAQ geothermo- barometry is supplied in the Electronic Supplementary Materials.

关键词： Al2SiO5 application calibration garnet geothermobarometry muscovite.

Von Neumann Algebras Associated with the Group SL2（R）

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Acta Mathematica Sinica,English Series 2011年第9期27卷 1697-1704页

作者： Wen ming wu School of Mathematics and Computer Science Operations Research Laboratory Chongqing Normal University Chongqing 400047 P. R. China

Let M and N be the yon Neumann algebras induced by the rational action of the group SL2（R） and its subgroup P on the upper half plane H. We have shown that N is spatial isomorphic to the group von Neumann algebra Lp and characterized M and its commutant M＇ and gotten a generalization of the Mautner＇s lemma. It is also shown that the Berezin operator commutates with the Laplaeian operator.

关键词： Rational actions SL2 (R) von Neumann algebras compact operators

A newly found Paleozoic Japan-type subduction–accretion system

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Science Bulletin 2015年第23期60卷 2069-2070页

作者： Chun-ming wu College of Earth Science University of Chinese Academy of Sciences

Accretionary orogenic belts are complicated collages composed of magmatic arcs,accretionary complexes,ophiolitic me′langes,fore-arc/back-arc basins and microcontinents formed at convergent plate margins,which are key sites of continental growth through earth history[1].Arcs are important orogenic components of accretionary orogenesis,but the types of active margin with old continental basement and intraoceanic arcs without continental basement and their roles in accretionary orogenesis are *** Japan-type arc is a special kind of arc

关键词：增生杂岩日本式古生代系统俯冲蛇绿混杂岩板块边缘弧后盆地

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Acta Mathematica Sinica,English Series 2014年第5期30卷 723-736页

作者： Jin Song wu Wen ming wu School of Mathematical Sciences University of Science and Technology of China Department of Mathematics Chongqing Normal University

In this paper, we will estimate an upper bound for the similarity degree of the crossed product of a hyperfinite finite von Neumann algebra by weakly compact action of an infinite discrete group. We will also improve ... 详细信息

关键词： Similarity degree von Neumann algebra weakly compact action compact action crossed product

Designing Bézier surfaces minimizing the L^2-norm of the Gaussian curvature

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第1期8卷 142-148页

作者： MO Guo-liang wu ming-hua Department of Information and Computational Science Zhejiang University City College Hangzhou 310015 China

In freeform surface modelling, developable surfaces have much application value. But, in 3D space, there is not always a regular developable surface which interpolates the given boundary of an arbitrary piecewise smooth closed curve. In this paper, tensor product Bézier surfaces interpolating the closed curves are determined and the resulting surface is a minimum of the functional defined by the L2-integral norm of the Gaussian curvature. The Gaussian curvature of the surfaces is minimized by the method of solving nonlinear optimization problems. An improved approach trust-region form method is proposed. A simple application example is also given.

关键词： ensor product polynomial surfaces Gaussian curvature L^2-integral norm Texture mapping Nonlinear optimization

Influence of static pre-loading on the dynamic bending strength of concrete with particle element modeling

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Science China(Technological Sciences) 2015年第2期58卷 284-296页

作者： wu ming Xin ZHANG Chu Han State Key Laboratory of Hydroscience and Engineering Tsinghua University

Experimental tests show that static pre-loading has a significant effect on the dynamic strength of *** on meso-scale particle element model,numerical simulations of dynamic bending tests with pre-loading are *** stress–strain relationships are then *** increase in dynamic strength is found when the pre-loadings are imposed within the elastic limit of ***,when the imposition of pre-loadings reaches the plastic or softening range,dynamic strengths may gradually decrease along with the increase in *** distribution of energy components and the failure modes are discussed to explain the mechanisms of the phenomena.

关键词： concrete static pre-loading dynamic bending strength rate effect particle element modeling

Comparison of engineering failures and seismic responses of 500 kV transformer-bushing systems in the 2022 Luding earthquake

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 1029-1041页

作者： Zhu Wang wu ming’er Xie Qiang Department of Structural Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures(Tongji University) Shanghai 200092China

Cemented and mechanically clamped types of end fittings(fitting-C and fitting-M)are commonly used in transformer *** the Luding Ms 6.8 earthquake that occurred in China on September 5,2022,all transformer bushings with the two types of end fittings in a 500 kV substation were ***-earthquake field investigations were conducted,and the failures of the two types of bushings were *** elementary simulation models of the transformer-bushing systems were developed to simulate the engineering failures,and further compute their seismic responses for *** results indicate that the hitch lugs of the connection flange are structurally harmful to seismic ***-M can decrease the bending stiffness of the bushing due to the flexible sealing rubber *** it provides a more flexible connection that dissipates energy,the peak accelerations and relative displacements at the top of the bushing are significantly lower than those of the bushing with *** with fitting-C,fitting-M transfers the high-stress areas from the connection flange to the root of the porcelain,so the latter becomes the most vulnerable ***-M increases the failure risk of the low-strength porcelain,indicating the unsuitability of applying it in high-intensity fortification regions.

关键词： transformer bushing end fitting Luding earthquake,engineering failure seismic responses