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Chinese Chemical Letters 2007年第1期18卷 81-84页

作者： Jing xin Meng Ying Ma xin xin xu Yang guang Li En Bo Wang Key Laboratory of Polyoxometalate Science of Ministry of Education Department of Chemistry Northeast Normal University Ren Min Street No.5268 Changchun Jilin 130024 PR China

A new heteropolytungstate, [H2bpy]3[SiMnW11O39]· 1.25H2O （1）, has been prepared under mild hydrothermal conditions and structurally characterized by single crystal X-ray diffraction. It is the first characterized compound containing ID zigzag chain of transition metal substituted Keggin heteropolytungstate, which is connected through a common oxygen atom. The elemental analysis and IR of it are also described.

关键词： Heteropolytungstate Keggin clusters Zigzag chain

Raman Gain Coefficients of Nd:Lu_(x)Y_(1−x)VO_(4)Crystals

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Chinese Physics Letters 2013年第11期30卷 171-174页

作者： ZHANG Fang WANG Zheng-Ping ZHAO Yong-guang xu xin-guang State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100

By using a pulse laser at 532.36 nm as the incident light,stimulated Raman scattering(SRS)of a series of a-cut and c-cut Nd:Lu_(x)Y_(1−x)VO_(4)(x=0,0.10,0.26,0.41,0.61,0.67,0.80)crystals is *** theπ-polarization(E||c),the gain coefficient reduced as x value *** theσ-polarization(E||a),the Raman gain of all of the mixed crystals is larger than the pure Nd:YVO_(4),and the maximum value is obtained from the Nd:Lu_(0.1)Y_(0.9)VO_(4)*** results are also supported by the measurement of spontaneous Raman scattering spectra.

关键词： Nd polarization scattering

Two-Photon Absorption-Induced Emission Properties of Dye HMASPS Doped Polymer

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Chinese Physics Letters 2002年第2期19卷 208-210页

作者： Wang Dong Zhou guang-Yong Ren Yan Yang Sheng-Jun xu xin-guang Shao Zong-Shu Jiang Min-Hua State Key Laboratory of Crystal Materials Shandong University Ji'nan 250100

The 0.01M two-photon absorption dye trans-4-[p-(N-hydroxyethyl-N-methylamino)styryl]-N-methyl-pyridinium p-toluene sulfonate (HMASPS) doped polymer has been prepared. When pumped by the picosecond pulse from the pulsed mode-locked Nd:YAG laser, the polymer emits more intense upconverted fluorescence and superradiance compared to the solution sample of the dye. The two-photon pumped lasing with oscillating pulses has also been obtained. Compared to the dye in its solution state, the emission spectra of the polymer are all blueshifted. The polymer has a long upconverted fluorescent lifetime of about 4.041±0.04ns.

关键词： Photons

Two-Photon-Absorption Induced Superradiance of a New Organic Dye PSPS

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Chinese Physics Letters 2002年第5期19卷 739-741页

作者： Zhou guang-Yong Wang Dong Wang Xiao-Mei Yang Sheng-Jun xu xin-guang Zhao Xian Shao Zong-Shu Jiang Min-Hua State Key Laboratory of Crystal Materials Institute of Crystal Materials Shandong University Ji'nan 250100

The linear and nonlinear optical properties of a new two-photon absorption (TPA) dye, trans-4-(4'-pyrrolidinyl styryl)-N-methyl pyridinium methyl sulfate (abbreviated as PSPS) is reported. Intense red superradiance with a peak located at 625nm can be observed from PSPS solution in benzyl alcohol when pumped by a focused picosecond laser beam operated at 1064nm. The lifetimes of one-photon absorption (OPA) and TPA fluorescence were measured to be 370 and 384ps, respectively. The pulse widths of OPA and TPA superradiance were 60 and 58 ps, respectively. The highest net upconversion efficiency from the absorbed pump laser to the upconverted superradiance is 8.3% at the pump energy of 0.6 mJ.

关键词： Two photon processes

How Fast Could a Proto-pulsar Rotate?

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Chinese Journal of Astronomy and Astrophysics 2002年第6期2卷 533-538页

作者： Ren-xin xu, Hong-guang Wang and Guo-Jun QiaoDepartment of Astronomy, School of Physics, Peking University, Beijing 100871 Department of Astronomy School of Physics Peking University Beijing 100871

According to two estimated relations between the initial period and the dynamo-generated magnetic dipole field of pulsars, we calculate the statistical distributions of pulsar initial periods. It is found that proto-pulsars are very likely to have rotation periods between 20 ms and 30 ms, and that most of the pulsars rotate initially at a period < 60 ms. Our result supports the asymmetric neutrino emission model for pulsar kick.

关键词： pulsars neutron stars magnetic fields

Effect of Pressure on Thermal Stability and Decomposition of KDP Crystal

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Chinese Physics Letters 2011年第2期28卷 176-178页

作者： DING Jian-xu WANG Tao WANG Sheng-Lai CUI De-Liang MU Xiao-Ming xu xin-guang State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100 Yantai Department No.52 Institute of North Industries GroupYantai 264003

Effect of pressure on thermal behavior of KDP crystals is investigated by using the in-situ infrared reflective *** with that under normal atmosphere,the onset temperature of decomposition under pressure of 1 MPa is improved to from 210℃to 213℃,suggesting that the thermal stability of KDP is *** pressure of 2 MPa,the thermal stability is deteriorated and KDP begins to decompose at 183℃.Under normal atmosphere KDP decomposes in route of translating to K_(4)P_(2)O_(7)firstly,and then to KPO_(3).Under pressures of 1 MPa and 2MPa,KDP translates to KPO_(3)directly without any other polymeric intermediates.

关键词： spectra KDP decompose

Quantifying the strength of magnetic fields using baryon electric charge correlation

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Nuclear Science and Techniques 2024年第8期35卷 5-8页

作者： xu‑guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

Although heavy-ion collisions generate strong magnetic fields,their direct measurement is a challenging task.A new observable,the baryon electric charge correlation,was recently found to be sensitive to the magnetic field strength and thus could be used as a magnetometer for heavy-ion ***,this observable may shed light on the equation of state and phase structure of quantum chromodynamics(QCD)under magnetic *** and understanding the phase structure of quantum chromodynamics(QCD)is important in contemporary physics[1].

关键词： charge observable magnetic

Gluing Affine Vortices

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Acta Mathematica Sinica,English Series 2024年第1期40卷 250-312页

作者： guang Bo xu Department of Mathematics Rutgers UniversityHill Center-Busch Campus 110 Frelinghuysen RoadPiscatawayNJ 08854-8019USA

We provide an analytical construction of the gluing map for stable affine vortices over the upper half plane with the Lagrangian boundary *** result is a necessary ingredient in studies of the relation between gauged ... 详细信息

关键词： Affine vortices gauged linear sigma model adiabatic limit symplectic reduction

Noise Reduction in Photorefractive Image Amplification by Contradirectional Two-Wave Mixing in Rh-Doped BaTiOa Crystal

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Chinese Physics Letters 2000年第7期17卷 507-509页

作者： xu xin-guang MU Xiao-Dong SHAO Zong-Shu DU Chen-lin JIANG Min-Hua LUO Hao-su xu Hai-qing State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100 Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201800

Low noise image amplification owing to contradirectional two-wave mixing (CTWM) is proposed and demon strafed in Rh-doped BaTiOa crystal. Comparing with the conventional forward two-wave mixing scheme, an enhancement of signal-to-noise ratio in the order of 103 is obtained. The theoretical analyses are presented and give a reasonable explanation for the experimental results. The further discussion shows that CTWM scheme can also reduce the influence of the crystal absorption and crystal size on the two-wave mixing process to rise the signal beam gain.

关键词： Photorefractive directional mixing

Modern phenomics to empower holistic crop science, agronomy, and breeding research

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Journal of Genetics and Genomics 2024年第8期51卷 790-800页

作者： Ni Jiang xin-guang Zhu Institute of Genetics and Developmental Biology Chinese Academy of SciencesBeijing 100101China Center of Excellence for Molecular Plant Sciences Chinese Academy of SciencesShanghai 200032China

Crop phenomics enables the collection of diverse plant traits for a large number of samples along different time scales,representing a greater data collection throughput compared with traditional *** modern crop phenomics use different sensors to collect reflective,emitted,and fluorescence signals,etc.,from plant organs at different spatial and temporal *** multi-modal,high-dimensional data not only accelerates basic research on crop physiology,genetics,and whole plant systems modeling,but also supports the optimization of field agronomic practices,internal environments of plant factories,and ultimately crop *** challenges and opportunities facing the current crop phenomics research community include developing community consensus or standards for data collection,management,sharing,and processing,developing capabilities to measure physiological parameters,and enabling farmers and breeders to effectively use phenomics in the field to directly support agricultural production.

关键词： Crop phenomics High-throughput phenotyping Traits Crop designer breeding Agronomy