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Diode-Laser-Array Single-End-Pumped 5W Nd:YVO_(4)/KTP Continuous-Wave Solid-State Green Laser

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Chinese Physics Letters 1999年第7期16卷 508-509页

作者： LIU Jun-hai WANG Chang-qing LU Jun-hua LI Guang-ming SHAO Zong-shu WANG Ji-yang LIU Yao-gang jiang min-hua National Laboratory of Crystal Materials Shandong UniversityJiJnan 250100

Continuous-wave radiation of 5W at 532 nm was produced with an Nd:YVO_(4)/KTP intracavity&equency-doubled laser end-pumped by a diode-laser-array at pump power of 17.2 W,giving optical conversion efRciency of 29.1%.The output power stability was measured to be better than 1.5%in short term *** pump-induced thermal lensing was also measured,showing good agreement with the performance of the laser.

关键词： Nd: pump pumped

Investigation of Effective Nonlinear Coefficient of Nd^(3+)-Doped GdCOB and YCOB

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Chinese Physics Letters 1999年第10期16卷 726-727页

作者： LU Jun-hua LI Guang-ming ZHANG Shu-jun CHEN huan-chu GONG Bo WANG Ji-yang LIU Yao-gang jiang min-hua SHAO Zong-shu National Key Laboratory of Crystal Materials Shandong UniversityJi'nan 250100

Second harmonic generation conversion efficiencies of Nd:YCOB and Nd:GdCOB were measured,the effective nonlinear coefficient(de_(ff))for both crystals at different phase-matching angles were estimated by comparison with a KTP *** self-frequency doubling laser performance c£these crystals were theoretically calculated by using these rfeff values and slope efficiency of the fundamental wave and lasing *** results coincide very well.

关键词： Nd: doubling Nonlinear

Quantum age of vector magnetic field measurements

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 164-165页

作者： min jiang CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China

Magnetic fields are ubiquitous,and precise measurements of them can serve as powerful tools for deep understanding and accurate detection across multiple disciplines,including physics,biology,and chemistry[1].For instance,by measuring the magnetic fields within the human heart and brain,the medical community could obtain accurate disease diagnoses.

关键词： magnetic Quantum precise

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

Synthesis, Luminescence and Electrochemical Properties of Two Phenothiazine Derivatives

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Chinese Journal of Chemistry 2005年第11期23卷 1483-1489页

作者： LI, Dong-Mei ZHOU, Hong-Ping PU, Ji-Qin FENG, Xiao-Juna WU, Jie-Ying TIAN, Yu-Peng YU, Xiao-Qiang TAO, Xu-Tang jiang, min-hua Department of Chemistry Anhui University Hefei Anhui 230039 China State Key Laboratory of Crystal Materials Shandong University Jinan Shandong 250100 China State Key Laboratory of Coordination Chemistry Nanfing University Nanfing Jiangsu 210093 China

The synthesis, luminescence and electrochemical properties of two novel phenothiazine derivatives were presented, which exhibit good one-photon fluorescence emission. The quantum yields and solvent effects of them were studied in detail. Compound 3,7-bis（2-4＇-imidazolylbenzylidenehydrazonoethyl）-（0-ethylphenothiazine）（5） was used as an effective initiator, of which two-photon fluorescence spectra were investigated under 800 nm fs laser pulse and the measured two-photon absorption cross-section was 18 × 10^-50 cm^4·s per photon. Two-photon initiated polymerization microfabrication experiments were carried out. X-ray diffraction analyses revealed that the shape of the compound 3,7-bis（2-pyrid-4＇-ylmethylidenehydrazonoethyl）-（0-ethylphenothiazine）（4） looks like a butterfly with nearly planar wings. The dihedral angle of the two benzene rings is 37.6° and there is an obvious π-π stacking interaction between the molecules in the crystal.

关键词： two-photon absorption two-photon initiated polymerization electrochemical property π-π stacking interaction

Finite-time composite learning control for nonlinear teleoperation systems under networked time-varying delays

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Science China(Information Sciences) 2024年第6期67卷 279-296页

作者： Yana YANG Huixin jiang Changchun hua Junpeng LI Institute of Electrical Engineering Yanshan University

The robust finite-time synchronization control problem is investigated for master-slave networked nonlinear telerobotics systems(NNTSs) in this article. Although there have been some research achievements on finite-time control for the NNTSs, these studies are based on the strong assumptions of communication time delays or can only achieve finite-time bounded convergence even when the external forces are *** and in view of the importance of these issues, a novel robust composite learning adaptive control scheme rendering the finite-time master-slave synchronization is proposed in this paper. In particular, the influence of time delays on finite-time convergence of the system is analyzed by employing the multi-dimension finite-time small-gain framework. Meanwhile, in order to achieve accurate and fast estimation of uncertain parameters of the system, both the online historical and the instantaneous data of the estimation data are explored to derive the new parameter adaptive law under a more realizable interval-excitation(IE) ***, the convergence of the position/force synchronization errors and the adaptive parameter estimation errors is obtained in finite time, and enhanced robustness of the closed-loop system will also be ***, the superior performance of the proposed control algorithms is validated by numerical simulations and hardware experiments.

关键词： networked teleoperation systems finite-time control exact parameter estimation small-gain theorem unknown communication delays

Discovering deaminases using AlphaFold2:a strategy to search for tool proteins for gene editing

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Signal Transduction and Targeted Therapy 2024年第3期9卷 822-824页

作者： Yongye huang Jianxin jiang min Wu Key Laboratory of Bioresource Research and Development of Liaoning Province College of Life and Health SciencesNortheastern UniversityShenyang 110169China Wound Trauma Medical Center State Key Laboratory of TraumaBurns and Combined InjuryDaping HospitalArmy Medical UniversityChongqing 400042China Wenzhou Traditional Chinese Medicine Hospital of Zhejiang Chinese Medical University WenzhouZhejiang 325000China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325000China The Joint Research Center Affiliated Xiangshan Hospital of Wenzhou Medical UniversityNingboChina

A recent study by huang et *** in Cell reported the application of AlphaFold2 to forecast the structures of deaminase proteins and cluster them based on structural similarity,creating a truncated Sdd that can be used as a cytosine base editor(CBE)to be integrated into a single adeno-associated virus(AAV)1 This ground-breaking study aided by the artificial intelligence system would largely broaden the utility of tool proteins for gene editing.

关键词： CBE Alpha editor

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大型循环流化床锅炉的开发研制

中国电机工程学报 2007年第23期27卷 1-6页

作者：蒋敏华孙献斌西安热工研究院有限公司陕西省西安市710032

对大型循环流化床(CFB)锅炉的技术开发与研制工作进行了全面总结。自主研制的100MWCFB锅炉具有良好的运行性能。200MW以上容量CFB锅炉大型化的关键是外置换热器的研究和开发。西安热工研究院建立了世界上最大的CFB热态试验台,开发了紧... 详细信息

对大型循环流化床(CFB)锅炉的技术开发与研制工作进行了全面总结。自主研制的100MWCFB锅炉具有良好的运行性能。200MW以上容量CFB锅炉大型化的关键是外置换热器的研究和开发。西安热工研究院建立了世界上最大的CFB热态试验台,开发了紧凑式分流回灰换热器专利技术,并在该基础上提出了"复合炉型"的设计思想和炉型方案。据该技术开发研制的210MWCFB锅炉已在江西分宜发电厂成功投入运行,330MWCFB锅炉示范工程正在实施阶段。文中还对600MW超临界CFB锅炉的关键技术进行了分析研究。

关键词：循环流化床锅炉大型化紧凑式分流式回灰换热器超临界CFB锅炉

Strain Gradient Finite Element Formulation of Flexoelectricity in Ferroelectric Material Based on Phase-Field Method

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Acta Mechanica Solida Sinica 2024年第4期37卷 570-579页

作者： Shuai Wang Hengchang Su min Yi Li-hua Shao National Key Laboratory of Strength and Structural Integrity Institute of Solid MechanicsSchool of Aeronautic Science and EngineeringBeihang UniversityBeijing100191People’s Republic of China State Key Laboratory of Mechanics and Control for Aerospace Structures and Institute for Frontier Science and Key Laboratory for Intelligent Nano Materials and Devices of ministry of Education and College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016People’s Republic of China

Flexoelectricity is a two-way coupling effect between the strain gradient and electric field that exists in all dielectrics,regardless of point group ***,the high-order derivatives of displacements involved in the strain gradient pose challenges in solving electromechanical coupling problems incorporating the flexoelectric *** this study,we formulate a phase-field model for ferroelectric materials considering the flexoelectric effect.A four-node quadrilateral element with 20 degrees of freedom is constructed without introducing high-order shape *** microstructure evolution of domains is described by an independent order parameter,namely the spontaneous polarization governed by the time-dependent Ginzburg–Landau *** model is developed based on a thermodynamic framework,in which a set of microforces is introduced to construct the constitutive relation and evolution *** the flexoelectric part of electric enthalpy,the strain gradient is determined by interpolating the mechanical strain at the node via the values of Gaussian integration points in the isoparametric *** model is shown to be capable of reproducing the classic analytical solution of dielectric materials incorporating the flexoelectric *** model is verified by duplicating some typical phenomena in flexoelectricity in cylindrical tubes and truncated pyramids.A comparison is made between the polarization distribution in dielectrics and *** model can reproduce the solution to the boundary value problem of the cylindrical flexoelectric tube,and demonstrate domain twisting at domain walls in ferroelectrics considering the flexoelectric effect.

关键词： Flexoelectricity Phase-field method Ferroelectrics Domain configuration