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Highly luminescent zero-dimensional lead-free manganese halides forβ-ray scintillation

Nano Research 2022年第9期15卷 8486-8492页

作者： Linyuan Lian Wei Qi Huaiyi Ding hao tian Qi Ye Yong-Biao Zhao Long Zhao Jianbo gao Daoli Zhang Jianbing Zhang School of Optical and Electronic Information Huazhong University of Science and Technology1037 Luoyu RoadWuhan 430074China Hubei Key Laboratory of Bioinorganic Chemistry&Materia Medica School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Yunnan Provincial Higher Education Institutions for Optoelectronics Device Engineering School of Physics and AstronomyYunnan UniversityKunming 650504China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Physics and Astronomy Ultrafast Photophysics of Quantum Devices LaboratoryClemson UniversityClemsonSC 29634USA Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518057China

Because of their moderate penetration power,β-rays(high-energy electrons)are a useful signal for evaluating the surface contamination of nuclear ***,the development ofβ-ray scintillators,which convert the absorbed high-energy electrons into visible photons,is hindered by the limitations of materials ***,we report two highly luminescent zerodimensional(0D)organic-inorganic lead-free metal halide hybrids,(C_(13)H_(30)N)_(2)MnBr_(4)and(C_(19)H_(34)N)_(2)MnBr_(4),as scintillators exhibiting efficientβ-ray *** hybrid scintillators combine the superior properties of organic and inorganic *** example,organic components that contain light elements C,H,and N enhance the capturing efficiency ofβparticles;isolated inorganic[MnBr_(4)]2−tetrahedrons serve as highly localized emitting centers to emit intense radioluminescence(RL)underβ-ray *** hybrids show a narrow-band green emission peaked at 518 nm with photoluminescence quantum efficiencies(PLQEs)of 81.3%for(C_(13)H_(30)N)_(2)MnBr_(4)and 86.4%for(C_(19)H_(34)N)_(2)MnBr_(4),*** enable the solution processing of this promising metal halide hybrid,we successfully synthesized(C_(13)H_(30)N)_(2)MnBr_(4)colloidal nanocrystals for the first *** excited byβ-rays,(C_(13)H_(30)N)_(2)MnBr_(4)scintillators show a linear response toβ-ray dose rate over a broad range from 400 to 2,800 Gy·s^(−1),and also display robust radiation resistance that 80%of the initial RL intensity can be maintained after an ultrahigh accumulated radiation dose of 240 *** work will open up a new route for the development ofβ-ray scintillators.

关键词： zero-dimensional metal halide hybrids radiation sterilization β-ray scintillation nanocrystals

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Entropy based inverse design of aircraft mission success space in system-of-systems confrontation

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Chinese Journal of Aeronautics 2021年第12期34卷 99-109页

作者： Yuan gao Yongliang tian Hu LIU Jianwen HU School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Chinese Academy of Military Science Beijing 100091China

This paper presents a practical and efficient design method for aircraft Mission Success Space(MSS)based on the entropy measurement(EM).First,fundamentals regarding MSS,Inverse Design(ID)and entropy are ***,two EM schemes of entropy-based ID and the whole MSS ID procedure are given to demonstrate alternative ways of entropy quantification and MSS *** that,Genetic Algorithm(GA)is utilized as a search algorithm to find the optimal MSS design with the minimum objective,entropy,in each EM scheme.A simulation case of aircraft penetration mission is given for the method validation where the best aircraft MSS design is obtained by GA according to the minimum *** from two schemes are compared at the end.

关键词： Effectiveness evaluation Entropy Inverse design Military missions Mission success space System of systems(SoS)

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Effect of Fe Addition on Dehydrogenation Performance of Methylcyclohexance over Pt/Al_(2)O_(3)

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 12-18页

作者： Tong Fengya tian hao Wang hao Miao Changxi Song Lei Shanghai Research Institute of Petrochemical Technology SINOPEC Shanghai201208

Catalysts with varying Fe contents were prepared using a sequential impregnation method to investigate the effects of Fe addition on the physicochemical properties of Pt/Al_(2)O_(3) and their performance in methylcyclohexane(MCH)*** results demonstrated that the addition of Fe to Pt/Al_(2)O_(3) enhanced the electron density of Pt and improved catalytic activity,while exhibiting negligible influence on the catalytic selectivity for *** the Fe content was 0.057%,the catalyst exhibited the highest MCH consumption rate,which was approximately two times higher than that of the catalyst without ***,the incorporation of Fe inhibited the formation of coke and reduced the quantity of coke deposits on the catalyst,thereby improving its catalytic ***,Fe shows promise as a prospective secondary element for Pt/Al_(2)O_(3) to enhance the MCH dehydrogenation performance.

关键词： methylcyclohexane dehydrogenation hydrogen storage deactivation Fe addition

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Identifying and Quantifying Pixel-Level Uncertainty among Major Satellite Derived Global Land Cover Products

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Journal of Meteorological Research 2020年第4期34卷 806-821页

作者： hao gao Gensuo JIA Yu FU National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081 Key Laboratory of Regional Climate–Environment for Temperate East Asia(RCE-TEA) Chinese Academy of SciencesBeijing 100029 Climate Change Research Center Chinese Academy of SciencesBeijing 100029

Accurate global land cover(GLC), as a key input for scientific communities, is important for a wide variety of applications. In order to understand the current suitability and limitation of GLC products, the discrepancy and pixellevel uncertainty in major GLC products in three epochs are assessed in this study by using an integrated uncertainty index(IUI) that combines the thematic uncertainty and local classification accuracy uncertainty. The results show that the overall spatial agreements(Ao values) between GLC products are lower than 58%, and the total areas of forests are very consistent in major GLC products, but significant differences are found in different forest *** misclassification among different forest classes and mosaic types can account for about 20% of the total disagreements. The mean IUI almost reaches 0.5, and high uncertainty mostly occurs in transition zones and heterogeneous areas across the world. Further efforts are needed to make in the land cover classifications in areas with high uncertainty. Designing a classification scheme for climate models, with explicit definitions of land cover classes in the threshold of common attributes, is urgently needed. Information of the pixel-level uncertainty in major GLC products not only give important implications for the specific application, but also provide a quite important basis for land cover fusion.

关键词： global land cover(GLC) discrepancies thematic similarity local accuracy pixel-level uncertainty

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Decode protein-metabolite regulatory network: one MIDAS at a time

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Signal Transduction and Targeted Therapy 2023年第9期8卷 3896-3898页

作者： tian Liu Chen gao Department of Pharmacology and Systems Physiology University of CincinnatiCincinnatiOHUSA

In a recent study published in Science,Hicks et *** Mass spectrometry integrated with equilibrium dialysis for the discovery of allostery systematically(MIDAS)to explore protein-metabolite interactome and have revealed previously unknown regulation for lactate dehydrogenase.1 This report brings an exciting new approach to address a long-standing challenge in *** functions are orchestrated by an interactive network of molecular constituents,the physical interactions between proteins and other molecular entities,such as DNA,RNA,and *** basic vocabulary for the book of life,these interactions are the fundamental mechanisms for complex physiology and diseases.

关键词： network such she

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Novel method of gait switching in six-legged robot walking on continuous-nondifferentiable terrain by utilizing stability and interference criteria

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Science China(Technological Sciences) 2020年第12期63卷 2527-2540页

作者： MAO LiHeng tian Yuan gao Feng Zhao Yue State Key Laboratory of Mechanical System and Vibration Department of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Continuous-nondifferentiable terrains are extremely challenging for the environment adaption of six-legged robots. Previous researches have focused on gait planning methods to improve inherent ability of legged robots to walk over moderate ***,most six-legged robots utilize relatively monotonic gait so that they still cannot well adapt tough terrains. As a result,the current legged robots easily get stuck and fall when encountering continuous-nondifferentiable terrains,such as ***,a method of gait switching is proposed so that six-legged robots can flexibly generate multiple gaits to adapt complex terrains. This study investigated the relationship between six-legged robot gait topologies and physical constraints,such as robot stability and robot-terrain interference. The proposed gait switcher can generate 0-6,1-5,2-4 and 3-3 gaits,which is instructed by the stability and interference criteria. Simulations and experiments were performed on a novel six-legged robot Hexa-XIII that succeeded climbing stairs over 45°. The effectiveness of the gait switching method is validated by the experiment results.

关键词： six-legged robot continuous-nondifferentiable terrain gait switching method stability criteria interference criteria

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Gaussian fitting based optimal design of aircraft mission success space using multi-objective genetic algorithm

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Chinese Journal of Aeronautics 2020年第12期33卷 3318-3330页

作者： Yuan gao Yongliang tian Hu LIU Xue SUN School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China

In order to obtain the optimized aircraft design concept which meets the increasingly complex operation environment at the conceptual design stage,System-of-systems(So S)engineering must be *** paper proposes a novel optimization method for the design of aircraft Mission Success Space(MSS)based on Gaussian fitting and Genetic Algorithm(GA)in the So S ***,the concepts in the design and evaluation of MSS are summarized to introduce the Contribution to System-of-Systems(CSS)by using a conventional effectiveness index,Mission Success Rate(MSR).Then,the mathematic modelling of Gaussian fitting technique is noted as the basis of the optimization *** that,the proposed optimal MSS design is illustrated by the multiobjective optimization process where GA acts as the search tool to find the best solution(via Pareto front).In the case study,a simulation system of penetration mission was *** simulation results are collected and then processed by two MSS design schemes(contour and neural network)giving the initial variable space to GA *** on that,the proposed optimization method is implemented under both schemes whose optimal solutions are compared to obtain the final best design in the case study.

关键词： Evaluation Gaussian fitting Genetic algorithm Mission success space Neural network System-of-systems

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Enhanced Nonlinear Optical Properties of Laser Deposited Ag／BaTiO3 Nanocomposite Films

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Chinese Physics Letters 2003年第6期20卷 924-927页

作者： YANGGuang WANGWei-tian YANGGuo-Zhen CHENZheng-hao LaboratoryofOpticalPhysics InstituteofPhysicsandCenterforCondensedMatterPhysicsChineseAcademyofSciencesBeijing100080

The composite films containing Ag particles embedded in BaTiO3 matrix were deposited on MgO (100) substrates by using the pulsed laser deposition technique and characterized by x-ray diffraction and x-ray photoelectron spectroscopy. The absorption peak resulting from the surface plasmon resonance of Ag particles is found at the wavelength of 430 nm. The third-order nonlinear optical characteristics of the films are determined by z-scan technique using a nanosecond laser. The results show that the Ag/BaTiO3 nanocomposite films exhibit great optical nonlinearities and the real and imaginary parts of the third-order nonlinear susceptibility χ(3) are calculated to be 4.544×10-6 esu and 2.352×10-7 esu, respectively. The enhancement mechanism of χ(3) is discussed.

关键词： Nanocomposite films

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Application and prospective of 3D printing in rock mechanics: A review

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 1-17页

作者： Yong-tao gao tian-hua Wu Yu Zhou Key Laboratory of Ministry for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

This review aims to discuss the application and development of three-dimensional printing(3DP) technology in the field of rock mechanics and the mechanical behaviors of 3D-printed specimens on the basis of various available printing *** review begins with a brief description of the concepts and principles associated with 3DP, and then systematically elaborates the five major applications of 3DP technology in the field of rock mechanics, namely, the preparation of rock(including pre-flawed rock) specimens, preparation of joints, preparation of geophysical models, reconstruction of complex rock structures, and performance of bridging experimental testing and numerical ***, the mechanical performance of 3D-printed specimens created using six different printing materials, such as polymers, resin,gypsum, sand, ceramics, and rock-like geological materials, is reviewed in ***, some improvements that can make these 3D-printed specimens close to natural rocks and some limitations of 3DP technology in the application of rock mechanics are *** prospects that are required to be investigated in the future are also ***, a brief summary is *** review suggests that 3DP technology, especially when integrated with other advanced technologies, such as computed tomography scanning and 3D scanning, has great potential in rock mechanics field.

关键词： three-dimensional printing(3DP) rock mechanics 3DP material rock analogue 3DP geotechnical model numerical simulation

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A NEW INSTRUMENT FOR MEASURING LOCAL MOISTURE CONTENTS IN MOIST POROUS MEDIA

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Journal of Hydrodynamics 2005年第3期17卷 371-378页

作者： HANJi-tian WANGJi-hao GUIKe-ting SHIMing-heng SchoolofEnergySourceandPowerEngineering ShandongUniversityJinan250061China CollegeofControlScienceandTechnology ShandongUniversityJinan250061China DepartmentofPowerEngineering SoutheastUniversityNanjing210096China

A new instrument was developed for measuring the local moisture content in moist porous media based on the needle-type capacitance sensor and single-chip microprocessor technique. The working principle, the structure and characteristics of the hardware and software of the instrument were presented. The dynamic response characteristics and reliability of the instrument were experimentally determined. As an example, the instrument was employed to measure the heat and mass transport properties of a moist porous material. The experimental results show that the instrument can be used for measuring the local moisture content in moist porous media and would be an effective tool for determining the heat and mass transport properties in moist porous media.

关键词： moisture contents capacitance sensor porous media heat and mass transfer

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