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3-d crustal-scale gravity model of the San Rafael Block and Payenia volcanic province in Mendoza,Argentina

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Geoscience Frontiers 2018年第1期9卷 239-248页

作者： daniel Richarte Marianela Lupari Agustina Pesce Silvina Nacif Mario Gimenez Instituto Geofísico-Sismológico Volponi Universidad Nacional de San JuanArgentina Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET) Argentina

The San Rafael Block(SRB)is part of one of the main retroarc volcanic provinces in southern Central Andes in Mendoza,*** block is located in the Andean foothills between the orogenic front and foreland basement uplifts of late Miocene *** order to analyze the geochronological evolution of the Quaternary volcanism in the region,several geologic and geophysical studies have been ***,the crust,where the SRB is located,has not been well characterized *** on gravimetric and magnetic data,together with isostatic and elastic thickness analyses,we modeled the crustal structure of the *** obtained has allowed us to understand the crust where the SRB and the Payenia volcanic province are *** anomalies indicate that the SRB presents higher densities to the North of Cerro Nevado and Moho calculations suggest depths for this block between 40 and 50 *** of elastic thickness would indicate that the crust supporting the San Rafael Block presents values of approximately 10 km,being enough to support the block ***,in the Payenia region,elastic thickness values are close to zero due to the regional temperature increase.

关键词： San Rafael Block Payenia 3-d crustal model Asthenospheric wedge

Modeling of 3-d Air Traffic Complexity Based on Route Structure Constraints

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第2期36卷 352-360页

作者： XIE Hua WU Zhe CHEN Feifei CHEN Haiyan College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China State Key Laboratory of Air Traffic Management System and Technology Nanjing 210007P.R.China College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China

It is an important issue to assess traffic situation complexity for air traffic *** is a lack of systematic review of the existing air traffic complexity assessment methods,and there is no consideration of the role of airspace and traffic coordination mechanism.A new 3-d airspace complexity measurement method is proposed based on route structure constraints to evaluate the air traffic complexity ***,the model of the impact on horizontal and vertical direction for“aircraft pair”is established based on the route *** that,the coupled complexity model for 3-d airspace is given according to the modification on the model in terms of flight ***,the global model of the airspace traffic complexity is *** is proved by the experimental data from the actual operation in airspace that the proposed model can reflect the space coupling situation and complexity of *** the same time,it can precisely describe the actual operation of civil aviation in China.

关键词： air traffic management traffic complexity flight standardization aircraft pair 3-d airspace

A new navigation approach of terrain contour matching based on 3-d terrain reconstruction from onboard image sequence

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Science China(Technological Sciences) 2010年第5期53卷 1176-1183页

作者： LI LiChun1,2,YU QiFeng2,SHANG Yang2,YUAN Yun2,LU HongWei3 & LIU XiaoLin4 1 Beijing Aerospace Control Center,Beijing 100094,China 2 College of Aerospace and Material Engineering,National University of defense Technology,Changsha 410073,China 3 Equipment Research Institute of PLA’s Second Artillery,Beijing 100085,China 4 College of Mechatronic Engineering and Automation,National University of defense Technology,Changsha 410073,China Beijing Aerospace Control Center Beijing China College of Aerospace and Material Engineering National University of Defense Technology Changsha China Equipment Research Institute of PLA’s Second Artillery Beijing China College of Mechatronic Engineering and Automation National University of Defense Technology Changsha China

This article presents a passive navigation method of terrain contour matching by reconstructing the 3-d terrain from the image sequence(acquired by the onboard camera).To achieve automation and simultaneity of the image sequence processing for navigation,a correspondence registration method based on control points tracking is proposed which tracks the sparse control points through the whole image sequence and uses them as correspondence in the relation geometry ***,a key frame selection method based on the images overlapping ratio and intersecting angles is explored,thereafter the requirement for the camera system configuration is *** proposed method also includes an optimal local homography estimating algorithm according to the control points,which helps correctly predict points to be matched and their speed ***,the real-time 3-d terrain of the trajectory thus reconstructed is matched with the referenced terrain map,and the result of which provides navigating *** digital simulation experiment and the real image based experiment have verified the proposed method.

关键词： terrain contour matching vision-based navigation 3-d reconstruction control points key frame registration optimal local homography

A SEMI-IMPLICIT 3-d NUMERICAL MOdEL USING SIGAM-COORdINATE FOR NON-HYdROSTATIC PRESSURE FREE-SURFACE FLOWS

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Journal of Hydrodynamics 2011年第2期23卷 212-223页

作者： HU de-chao FAN Bei-lin WANG Guang-qian ZHANG Hong-wu State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Yangtze River Scientific Research Institute Wuhan 430010 China

A 3-d numerical formulation is proposed on the horizontal Cartesian, vertical sigma-coordinate grid for modeling non-hydrostatic pressure flee-surface flows. The pressure decomposition technique and 0 semi-implicit method are used, with the solution procedure being split into two steps. First, with the implicit parts of non-hydrostatic pressures excluded, the provisional velocity field and free surface are obtained by solving a 2-d Poisson equation. Second, the theory of the differential operator is employed to derive the 3-d Poisson equation for non-hydrostatic pressures, which is solved to obtain the non-hydrostatic pressures and to update the provisional velocity field. When the non-orthogonal sigma-coordinate transformation is introduced, additional terms come into being, resulting in a 15-diagonal, diagonally dominant but unsymmetric linear system in the 3-d Poisson equation for non-hydrostatic pressures. The Biconjugate Gradient Stabilized （BiCGstab） method is used to solve the resulting 3-d unsymmetric linear system instead of the conjugate gradient method, which can only be used for symmetric, positive-definite linear systems. Three test cases are used for validations. The successful simulations of the small-amplitude wave, a supercritical flow over a ramp and a turbulent flow in the open channel indicate that the new model can simulate well non-hydrostatic flows, supercritical flows and turbulent flows.

关键词： 3-d numerical model non-hydrostatic sigma-coordinate semi-implicit pressure-splitting

Self-Interference Elimination by Physical Feedback Channel in CCFd for 3-d Beamforming Communication

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China Communications 2017年第9期14卷 62-71页

作者： Naveed Ali Kaimkhani Zhe Chen Fuliang Yin School of Information and Communication Engineering Dalian University of Technology

The 3-d beamforming scheme has elite as evolving interest because of its efficiency to empower assorted techniques such as vertical and horizontal domains and emanation beamforming according to subscriber's provisions. Usually, 3-d beamforming communication is set up on Fdd/Tdd approach those effects on the performance of spectrum and energy efficiency. Co-frequency and CoTime Full duplex(CCFd) is an effective solution to improve the spectrum and energy efficiency by transmitting and receiving simultaneously in frequency and time domain. While, CCFd communication often face the self-interference issue when communication occurs, simultaneously. Consequently, in this paper a self-interference elimination by physical feedback channel in CCFd for 3-d Beamforming communication scheme is proposed to improve the over-all system performance in terms of energy and spectrum efficiency. The simulation and analytical outcomes demonstrated that the proposed system is superior than the traditional one.

关键词： spectrum efficiency energy effi-ciency co-frequency and co-time full duplex self-interference suppression 3-d beamform-ing

Synthesizing monochromatic 3-d images by multiple-exposure rainbow holography with vertical area-partition approach

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Science China Mathematics 2002年第12期45卷 1603-1609页

作者：翟宏琛母国光王明伟刘福民 Institute of Modern Optics Nankai University Key Lab. Optoelectron. Info. Sci. T. Tianjin 300071 China

We report for the first time the theoretical analysis and experimental results of a white-light reconstructed monochromatic 3-d image synthesizing tomograms by multiple rainbow holo-graphy with vertical-area partition (VAP) approach. The theoretical and experimental results show that 3-d monochromatic image can be synthesized by recording the master hologram by VAP ap-proach without any distortions either in gray scale or in geometrical position. A 3-d monochromatic image synthesized from a series of medical tomograms is presented in this paper for the first time.

关键词： multiple-exposure rainbow holography, holographic 3-d synthesis, vertical-area partition, monochromatic image, vision gray level, geometric aberration.

Numerical simulation on the evolution of cloud particles in 3-d convective cloud

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Science China Earth Sciences 2009年第8期52卷 1195-1206页

作者： XiaoLi Liu ShengJie Niu Key Laboratory of Meteorological disaster of Ministry of Education School of Atmospheric Physics Nanjing University of Information Science & Technology Nanjing 210044 China

A 3-d convective cloud model with compressible non-hydrostatic dynamics and the spectral bin microphysics of a 2-d slab-symmetric model has been used to simulate an observed supercell storm occurring on 29 June, 2000 ... 详细信息

关键词： spectral bin microphysics 3-d convective cloud numerical simulation evolution of particle spectrum

A New 3-d Supramolecular Framework Built by Co4-Substituted Sandwiched Phosphotungstates, Organoamines and Co-Complexes: Synthesis, Structure, and Property

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Chinese Journal of Structural Chemistry 2019年第9期38卷 1585-1592页

作者： MA Wei-dan LI Hai-Lou YANG Guo-Yu School of Chemistry and Chemical Engineering Beijing Institute of Technology

A neoteric organic-inorganic hybrid Co-substituted phosphotungstate H6{[Co(en)2(OAc)2]2[Co4(H2 O)2(PW9 O34)2]}?2 H2 en?36 H2 O(1, en = enthylenediamine) has been made under hydrothermal conditions and characterized by IR spectrum, thermogravimetric analysis, diffuse-reflectance spectroscopy, powder X-ray diffraction, single-crystal X-ray diffraction and cyclic voltammetry, respectively. Crystal data for 1: monoclinic, P21/c, a = 18.2234(12), b = 15.3696(9), c = 20.1706(17) ?, β = 106.563(8)°, V = 5415.1(7) ?3, Z = 2, Mr = 6072.30, dc = 3.724 g/cm3, μ = 20.087 mm-1, F(000) = 5540, R = 0.0585, w R = 0.1543 and S = 1.024. Single-crystal X-ray structure analysis reveals that compound 1 exhibits a 3-d supramolecular framework via H-bonding interactions, in which the discrete Co-complex is modified by two types of organic ligands, en and acetate. In addition, the adsorption experiments demonstrate compound 1 possesses a remarkable capability for scavenging of methylene blue.

关键词： polyoxometalate hydrothermal synthesis 3-d supramolecular framework adsorption properties

Modeling of 3-d terrain effect on MT field using BEM

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Chinese Science Bulletin 1997年第9期42卷 764-767页

作者： XU Shizhe, RUAN Baiyao, ZHOU Hui and CHEN Leshou1.Institute of Geology and Geophysics, Ocean University of Qingdao, Qingdao 266003, China 2. China University of Geosciences, Beijing 100083, China Institute of Geology and Geophysics Ocean University of Qingdao Qingdao China Chi University of Geosciences Beijing China

THE modeling of 2-d terrain effect on magnetotelluric(MT)has been solved using finite ele-ment method(FEM)and boundary element method(BEM).This note uses BEM tosolve the *** solution of H_x- and E_x-polarization wave ... 详细信息

关键词： MT 3-d terrain boundary element method.