检索结果-南通市图书馆

Efficient combination rule of Dezert-Smarandache theory

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2008年第6期19卷 1139-1144页

作者： Hu Lifang guan xin He You Research Inst. of Information Fusion Naval Aeronautical Astronautical Univ. Yantai 264001 P. R. China

The Dezert-Smarandache theory （DSmT） is a useful method for dealing with uncertainty problems. It is more efficient in combining conflicting evidence. Therefore, it has been successfully applied in data fusion and object recognition. However, there exist shortcomings in its combination rule. An efficient combination rule is presented, that is, the evidence＇s conflicting probability is distributed to every proposition based on remaining the focal elements of conflict. Experiments show that the new combination rule improves the reliability and rationality of the combination results. Although evidences conflict another one highly, good combination results are also obtained.

关键词： DSmT the focal element of conflict object recognition.

Upconversion multicolor tuning of NaY(WO_4)_2:Tb^(3+) with Eu^(3+) doping

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2018年第9期36卷 911-916页

作者： Zhongxiang Shi Jing Wang xin guan Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders Dalian Jiaotong University

A series of Tb3＋ and Eu3＋ co-doped NaY（WO4）2 phosphors were synthesized by hydrothermal *** crystal structure,morphology,upconversion luminescent properties,the energy transfer from Tb3＋ to Eu3＋ions and the 5 D4→ 7 F5 transition of the Tb3＋ ion in NaY（WO4）2：Tb3＋,Eu3＋ phosphors were investigated in *** results indicate that all the synthesized samples are of pure tetragonal phase NaY（WO4）***,the micrometer-sized needle spheres and excellent dispersion of the particles are obtained by adding polyethylene glycol（PEG-2000） as the *** of NaY（WO4）2：Tb3＋,Eu3＋ exhibit the492 nm blue emission peak,546 nm green emission peak,595 nm orange emission peak and 616 nm red emission peak under 790 nm *** energy transfer from Tb3＋ to Eu3＋ is a resonant transfer,in which electric dipole-dipole interaction plays a leading *** adjusting the doping concentration of Eu3＋ in NaY（WO4）2： 1.0 mol%Tb3＋,xmol%Eu3＋ phosphors,the emitting color of UC phosphors can be tuned from green to red.

关键词： Up-conversion luminescence NaY(WO4)2:Tb^3+ Eu^3+ Polyethylene glycol Energy transfer Rare earths

Interplay between topology and localization on superconducting circuits

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第6期33卷 240-246页

作者：关欣霍炳燕陈刚 Department of Materials and Chemical Engineering Taiyuan UniversityTaiyuan 030032China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China School of Physics Zhengzhou UniversityZhengzhou 450001China

Topological insulators occupy a prominent position in the realm of condensed matter physics. Nevertheless, the presence of strong disorder has the potential to disrupt the integrity of topological states, leading to the localization of all *** study delves into the intricate interplay between topology and localization within the one-dimensional Su–Schrieffer–Heeger(SSH) model, which incorporates controllable off-diagonal quasi-periodic modulations on superconducting *** the application of external alternating current(ac) magnetic fluxes, each transmon undergoes controlled driving,enabling independent tuning of all coupling strengths. Within a framework of this model, we construct comprehensive phase diagrams delineating regions characterized by extended topologically nontrivial states, critical localization, and coexisting topological and critical localization phases. The paper also addresses the dynamics of qubit excitations, elucidating distinct quantum state transfers resulting from the intricate interplay between topology and localization. Additionally, we propose a method for detecting diverse quantum phases utilizing existing experimental setups.

关键词： topology localization superconducting circuits

A New Infructescence of Angiosperms from the Early Cretaceous of China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2020年第5期94卷 1711-1713页

作者： HAN gang WANG xin Hainan Vocational University of Science and Technology Haikou 571126China Hainan Tropical Ocean University SanyaHainan 572022China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008China

Objective Angiosperms are the most diversified plant group in the current *** on angiosperms,especially on their origin,evolution and systematics,are the major tasks and challenges for *** increasing number of fossils... 详细信息

关键词： Cretaceous Jurassic origin

Detection of CO Outflow in Rotating Cores

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2008年第2期8卷 230-236页

作者： xin guan Yue-Fang Wu Department of Astronomy Peking University Beijing 100871

We investigate the effect of bulk motion on the detection of molecular outflows in the sources S146, GGD27, and IRAS 22566＋5830. The traditional techniques do allow for bulk motions or systematic VLSR shifts of the core emissions, which may cause contamination of the high velocity gas emissions, and outflows may either fail to be detected or have their properties miscalculated. We used a program to follow the systematic shift of VLSR and better results have been obtained.

关键词： ISM: jets and outflows -- ISM: kinematics and dynamics -- ISM: molecules-- stars: formation

Transitions to Equilibrium State in Classical φ4 Lattice

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第8期38卷 157-162页

作者： WANG xin-gang ZHANG Ying HU gang Department of Physics Beijing Normal University Beijing 100875 China The Abdus Salam International Centre for Theoretical Physics (ICTP) P.O. Box 586 34100 Trieste Italy Department of Physics Beijing Normal University Beijing 100875 China

Statistical behavior of a classical φ4 Hamiltonian lattice is investigated from microscopic dynamics. Thelargest Lyapunov exponent and entropies are considered for manifesting chaos and equipartition behaviors of the *** is found, for the first time, that for any large while finite system size there exist two critical couplings for the transitionsto equipartitions, and the scaling behaviors of these lower and upper critical couplings vs. the system size are numericallyobtained.

关键词： Hamiltonian system, measure synchronization, equilibrium, equipartition

Understanding the Development of the 2018/19 Central Pacific El Niño

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第1期40卷 177-185页

作者： Chengyang guan xin WANG Haijun YANG College of Ocean Science and Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering guangdong Laboratory(guangzhou) Guangzhou 511458China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Department of Atmospheric and Oceanic Sciences Fudan UniversityShanghai 200438China

A central Pacific(CP)El Niño event occurred in 2018/*** studies have shown that different mechanisms are responsible for different subtypes of CP El Niño events(CP-I El Niño and CP-II El Niño).By comparing the evolutions of surface winds,ocean temperatures,and heat budgets of the CP-I El Niño,CP-II El Niño,and 2018/19 El Niño,it is illustrated that the subtropical westerly anomalies in the North Pacific,which led to anomalous convergence of Ekman flow and surface warming in the central equatorial Pacific,played an important role in the 2018/19 El Niño event as well as in the CP-II El Niñ*** the off-equatorial forcing played a vital role,it is found that the equatorial forcing acted as a driving(damping)term in boreal spring(summer)of the 2018/19 El Niñ*** 2018/19 El Niño provides a timely and vivid example that helps illustrate the proposed mechanism of the CP El Niño,which could be leveraged to improve El Niño predictability.

关键词： El Niño subtropical Pacific westerly anomalies Ekman transport

Joint Subcarrier and Power Allocation for Multi-UAV Systems

在线全文

学校读者我要写书评

暂无评论

China Communications 2019年第1期16卷 47-56页

作者： xin guan Yang Huang Qingjiang Shi College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space(NUAA) Ministry of Industry and Information Technology School of Software Engineering Tongji University

This paper investigates subcarrier and power allocation in a multi-UAV OFDM *** study considers a practical scenario,where certain subcarriers are unavailable for dynamic subcarrier allocation,on account of pre-allocation for burst *** first propose a novel iterative algorithm to jointly optimize subcarrier and power allocation,so as to maximize the sum rate of the uplink transmission in the multiUAV OFDM *** key idea behind our solution is converting the nontrivial allocation problem into a weighted mean square error(MSE) *** this means,the allocation problem can be solved by the alternating optimization ***,aiming at a lower-complexity solution,we propose a heuristic allocation scheme,where subcarrier allocation and transmit power allocation are separately *** the heuristic scheme,closedform solution can be obtained for power *** results demonstrate that in the presence of stretched subcarrier resource,the proposed iterative joint optimization algorithm can significantly outperform the heuristic scheme,offering a higher sum rate.

关键词： Multi-UAV OFDM subcarrier allocation power allocation alternating optimization weighted MSE

Mesh deformation on 3D complex configurations using multistep radial basis functions interpolation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2018年第4期31卷 660-671页

作者： gang WANG xin CHEN Zhikan LIU School of Aeronautics Northwestern Polytechnical University

The Radial Basis Function（RBF） method with data reduction is an effective way to perform mesh deformation. However, for large deformations on meshes of complex aerodynamic configurations, the efficiency of the RBF mesh deformation method still needs to be further improved to fulfill the demand of practical application. To achieve this goal, a multistep RBF method based on a multilevel subspace RBF algorithm is presented to further improve the efficiency of the mesh deformation method in this research. A whole deformation is divided into a series of steps, and the supporting radius is adjusted in accordance with the maximal displacement error. Furthermore, parallel computing is applied to the interpolation to enhance the efficiency. Typical deformation problems of the NASA Common Research Model（CRM） configuration, the DLR-F6 wing-body-nacellepylon configuration, and the DLR-F11 high-lift configuration are tested to verify the feasibility of this method. Test results show that the presented multistep RBF mesh deformation method is efficient and robust in dealing with large deformation problems over complex geometries.

关键词： Data reduction Greedy method Mesh deformation Radial basis function Unstructured mesh