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Target recognition based on modified combination rule

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Journal of Systems Engineering and Electronics 2006年第2期17卷 279-283页

作者： chen Tianlu Que Peiwen Inst. of Automatic Detection Shanghai Jiaotong Univ. Shanghai 200030 China

Evidence theory is widely used in the field of target recognition. The invalidation problem of this theory when dealing with highly conflict evidences is a research hotspot. Several alternatives of the combination rule are analyzed and compared. A new combination approach is proposed. Calculate the reliabilities of evidence sources using existing evidences. Construct reliabilities judge matrixes and get the weights of each evidence source. Weight average all inputted evidences. Combine processed evidences with D-S combination rule repeatedly to identify a target. The application in multi-sensor target reeognition as well as the comparison with typical alternatives all validated that this approach can dispose highly conflict evidences efficiently and get reasonable reeognition results rapidly.

关键词： evidence theory combination rule conflict evidences target recognition data fusion.

Visible light-induced synthesis of biomass-derived quinoxaline by using Co phthalocyanine immobilized on pyridine-doped g-C_(3)N_(4)

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Journal of Energy Chemistry 2023年第7期82卷 638-652,I0013页

作者： Mingren Jin Seyed Mohsen Sadeghzadeh Jinzhu chen College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 511443GuangdongChina New Materials Technology and Processing Research Center Department of ChemistryNeyshabur BranchIslamic Azad UniversityNeyshaburIran

Visible light-driven valorization of biomass has recently been a pioneering field for nitrogen-containing heterocyclics syntheses due to its sustainable ***,various aromatic ring-doped g-C_(3)N_(4) nanosheets(Ar-g-C_(3)N_(4);Ar=Py,Pm,Ph)were precisely designed to modulate their intrinsic electronic and band structure,which involves pyridine(Py),pyrimidine(Pm),and benzene(Ph)-doped g-C_(3)N_(4).Photocatalysts(CoPc/Ar-g-C_(3)N_(4)) of cobalt(II)phthalocyanine(CoPc)-fabricated Ar-g-C_(3)N_(4) were then developed for oxidative cyclization of furoin with 1,2-phenylenediamines for syntheses of various biomass-derived quinoxalines under visible-light *** catalytic activity(in terms of TOFs)of serial CoPc/Ar-g-C_(3)N_(4) samples increased with their transient photocurrents with CoPc/Py-g-C_(3)N_(4) as the most active *** CoPc/Py-g-C_(3)N_(4),CoPc species functioned as both sensitizer and catalytic sites;while,doped Py led to a narrowed bandgap *** research further demonstrated that O_(2) was activated to superoxide radical(·O_(2)^(-)) by photoexcited high-level-energy electron(HLEE)transfer from Py-g-C_(3)N_(4) to CoPc for the subsequent aerobic oxidation.

关键词： Biomass Functionalized carbon nitride Nitrogen-containing heterocyclics Photocatalysis Quinoxaline

SELECTIVE　REDUCTION　OF　CLERODANE　DITERPENOIDS

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Chinese Chemical Letters 1996年第5期7卷 411-414页

作者： chen, HM Min, ZD NANKAI UNIV INST ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA CHINA PHARMACEUT UNIV DEPT PHYTOCHEMNANJING 210008PEOPLES R CHINA

Abstract: The α,β-unsaturated γ-lactones of neo-clerodane diterpenoids teucvidin, teupernin E and ajugacumbin A were selectively transformed into saturated γ-lactones and unsaturated diol derivatives with NaBH4. These transformations are of interest due to their selective reduction as compared with catalytic hydrogenation and LiAlH4 reduction of these diterpenoid compounds.

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Rabi Sidebands of Dressed Na Atom Excited By a Pulsed laser

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Chinese Physics Letters 1991年第3期8卷 141-144页

作者： chen Tianjie DUAN Shaoguang Deportment of Physics Peking UniversityBeijing 100871

The observation of Rabi sideband of Na atom shows the two-level dressed atom model is over *** a multi-level model and considering the time evolution of the laser pulse the experiment is well explained.

关键词： laser bands pulse

Tunable quantum dots in monolithic Fabry-Perot microcavities for high-performance single-photon sources

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Light(Science & Applications) 2024年第2期13卷 325-332页

作者： Jiawei Yang Yan chen Zhixuan Rao Ziyang Zheng Changkun Song Yujie chen Kaili Xiong Pingxing chen Chaofan Zhang Wei Wu Ying Yu Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Quantum Information Mechanism and Technology National University of Defense TechnologyChangsha 410073 HunanChina Hefei National Laboratory Hefei 230088China

Cavity-enhanced single quantum dots(QDs)are the main approach towards ultra-high-performance solid-state quantum light sources for scalable photonic quantum ***,harnessing the Purcell effect requires precise spectral and spatial alignment of the QDs’emission with the cavity mode,which is challenging for most *** we have successfully integrated miniaturized Fabry-Perot microcavities with a piezoelectric actuator,and demonstrated a bright single-photon source derived from a deterministically coupled QD within this *** the cavity-membrane structures,we have achieved large spectral tunability via strain *** resonance,a high Purcell factor of~9 is *** source delivers single photons with simultaneous high extraction efficiency of 0.58,high purity of 0.956(2)and high indistinguishability of 0.922(4).Together with its compact footprint,our scheme facilitates the scalable integration of indistinguishable quantum light sources on-chip,therefore removing a major barrier to the development of solid-state quantum information platforms based on QDs.

关键词： quantum removing purity

Exact mobility edges and topological phase transition in two-dimensional non-Hermitian quasicrystals

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 82-90页

作者： Zhi-Hao Xu Xu Xia Shu chen Institute of Theoretical Physics and State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi UniversityTaiyuan 030006China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Chern Institute of Mathematics and LPMC Nankai UniversityTianjin 300071China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Yangtze River Delta Physics Research Center Liyang 213300China

The emergence of the mobility edge(ME)has been recognized as an important characteristic of Anderson *** difficulty in understanding the physics of the MEs in three-dimensional(3 D)systems from a microscopic image encourages the development of models in lower-dimensional systems that have exact *** most of the previous studies are concerned with one-dimensional(1 D)quasiperiodic systems,the analytic results that allow for an accurate understanding of two-dimensional(2 D)cases are *** this work,we disclose an exactly solvable 2 D quasicrystal model with parity-time(PT)symmetry displaying exact *** the thermodynamic limit,we unveil that the extended-localized transition point,observed at the PT symmetry breaking point,is topologically characterized by a hidden winding number defined in the dual *** coupling waveguide platform can be used to realize the 2 D non-Hermitian quasicrystal model,and the excitation dynamics can be used to detect the localization features.

关键词： quasicrystals mobility edges non-Hermitian systems localization properties

An Efficient Synthesis of 2-Propyl-5-phenyl-1,4-dioxo-1,2,3,4,5,6,7, 8-octahydro-[1,4,2]diazaphosphorino[1,-2a][1,3,2] benzodiazaphosphorine 3-oxide

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Chinese Chemical Letters 2001年第12期12卷 1071-1074页

作者： Huang, JM chen, RY Nankai Univ Inst Elementoorgan Chem Tianjin 300071 Peoples R China

The novel 2-propyl-5-phenyl-1, 4-dioxo-1,2,3,4,5,6,7,8-octahydro-[1,4,2]diaza phosphorino[1,2-a][1,3,2]benzodiazaphosphorine 3-oxide has been synthesized by incorporating the proximate carbonyl and phosphoryl groups i... 详细信息

关键词： synthesis diazaphosphorino[1,2-a] benzodiazaphosphorine

Optical and Electrical Properties of Triphenylamine Derivatives for Dye-sensitized Solar Cells and Designing of Novel Molecule

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Chemical Research in Chinese Universities 2013年第3期29卷 584-588页

作者： chen Jun WANG Ming Key Laboratory of Analytical Chemistry for Living Biosystem State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beo'ing 100190 P R. China

With density functional theory（DFT） method, the optimization of molecular configurations and the calcu- lation of frontier molecular orbitals were achieved for triphenylamine（TPA）-based dye-sensitized solar cell materials at the B3LYP/6-31G（d, p） level. Time-dependent density functional theory（TD-DFT） was applied to calculating the probability of the transition from the ground state to the excited state. And UV-Vis absorption spectra were derived with Franck-Condon approximation. The conjugation length, substitution groups and spatial effects show a slight influence on the dihedral angle of the TPA group. The increase of conjugation length may cause a smaller energy gap as well as a higher highest occupied molecular orbital（HOMO） and a lower lowest unoccupied molecular orbital （LUMO）. The introduction of methoxyl group and TPA group could lower the energy gap while the HOMO and LUMO were elevated in energy.

关键词： Molecular design Time-dependent density functional theory Dye-sensitized solar cell Electronic structure calculation

Fossil pharyngeal teeth of grass carp group and their implications for evolution, temporal and spatial distribution pattern, and paleoenvironment

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Science China Earth Sciences 2021年第11期64卷 1844-1859页

作者： Ruifeng SU Mee-Mann CHANG Gengjiao chen Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate of Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China Beijing Institutes of Life Science Chinese Academy of SciencesBeijing 100101China Chinese Academy of Sciences Center for Excellence in Life and Paleoenvironment Beijing 100044China University of Chinese Academy of Sciences Bejing 100049China Natural History Museum of Guangxi Zhuang Autonomous Region Nanning 530012China

Grass carp(Ctenopharyngodon idella)is a cyprinid species,widely living in the freshwater on the plain area of East *** fish has characteristic comb-like pharyngeal teeth,an adaptation to their typical vegetarian feeding *** paper deals with fossil pharyngeal teeth that related to grass carp,found from about 20 localities,ranging from the lower Oligocene to *** on the morphology of the teeth,we established two new genera and species related to the genus Ctenopharyngodon(Dezaoia saintjaquensis,Eoctenopharyngodon liui)and two new species of Ctenopharyngodon(*** and ***).The first recognized *** pharyngeal teeth were from the lower Pliocene of Yushe,Shanxi,and many others from 11 Pleistocene to Holocene *** from the materials and their occurrences,the grass carp may have originated from the western part of China during the early *** the Miocene,the grass-carp-like pharyngeal teeth were discovered from a vast area in China,indicating an appropriate atmosphere for the grass carp to develop,although the climate in the western part of China was possibly drier than that in the eastern *** the beginning of the Pliocene,as the consequence of a considerable uplift of the Tibetan Plateau,the large rivers in East Asia finally formed,created favorable conditions for the Recent grass carp to *** teeth were collected in association with fossil ***,we are using the associated fossil mammals as the checking reference against which to test our interpretation of the surrounding environment of the water system in which the grass carp lived.

关键词： Comb-like pharyngeal teeth Grass carp and grass-carp-like fish Evolution Development of environment