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Atmospheric Gas and Heating Transmission Electron Microscopy with Water Vapor Control

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1591-1592页

作者： Zhou, Dan Spruit, Ronald G. Garza, Hugo Perez Bladt, Eva Lu, Chenyang Liu, Xi Carter, James Hutchings, Graham Liu, Wei DENSsolutions B.V. Netherlands Department of Nuclear Science and Technology School of Energy and Power Engineering Xi'an Jiaotong University Xi'an China School of Chemistry and Chemical Engineering In situ Center for Physical Sciences Shanghai Jiao Tong University Shanghai China Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT Cardiff Catalysis Institute School of Chemistry Cardiff University Cardiff United Kingdom Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics (DICP) Chinese Academy of Sciences Dalian China

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Structural and functional imaging of brains

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science China Chemistry 2023年第2期66卷 324-366页

作者： Zhichao Liu Ying Zhu Liming Zhang Weiping Jiang Yawei Liu Qiaowei Tang Xiaoqing Cai Jiang Li Lihua Wang Changlu Tao Xianzhen Yin Xiaowei Li Shangguo Hou Dawei Jiang Kai Liu Xin Zhou Hongjie Zhang Maili Liu Chunhai Fan Yang Tian Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai200241China Interdisciplinary Research Center Shanghai Synchrotron Radiation FacilityZhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai201210China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Chinese Academy of SciencesWuhan National Laboratory for OptoelectronicsWuhan430071China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China Department of Chemistry Tsinghua UniversityBeijing100084China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesInstitute of Translational MedicineShanghai Jiao Tong UniversityShanghai200240China Interdisciplinary Center for Brain Information Brain Cognition and Brain Disease InstituteShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsFaculty of Life and Health SciencesShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Lingang Laboratory Shanghai201602China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai200240China Institute of Systems and Physical Biology Shenzhen Bay LaboratoryShenzhen518055China Department of Nuclear Medicine Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Analyzing the complex structures and functions of brain is the key issue to understanding the physiological and pathological *** neuronal morphology and local distribution of neurons/blood vessels in the brain have been known,the subcellular structures of cells remain challenging,especially in the live *** addition,the complicated brain functions involve numerous functional molecules,but the concentrations,distributions and interactions of these molecules in the brain are still poorly *** this review,frontier techniques available for multiscale structure imaging from organelles to the whole brain are first overviewed,including magnetic resonance imaging(MRI),computed tomography(CT),positron emission tomography(PET),serial-section electron microscopy(ss EM),light microscopy(LM)and synchrotron-based X-ray microscopy(XRM).Specially,XRM for three-dimensional(3D)imaging of large-scale brain tissue with high resolution and fast imaging speed is ***,the development of elegant methods for acquisition of brain functions from electrical/chemical signals in the brain is *** particular,the new electrophysiology technologies for neural recordings at the single-neuron level and in the brain are also *** also focus on the construction of electrochemical probes based on dual-recognition strategy and surface/interface chemistry for determination of chemical species in the brain with high selectivity and long-term stability,as well as electrochemophysiological microarray for simultaneously recording of electrochemical and electrophysiological signals in the ***,the recent development of brain MRI probes with high contrast-to-noise ratio(CNR)and sensitivity based on hyperpolarized techniques and multi-nuclear chemistry is ***,multiple optical probes and instruments,especially the optophysiological Raman probes and fiber Raman photometry,for imaging and biosensing in live brain are emphas

关键词： brain structure brain function brain chemistry chemical signal biosensing and bioimaging

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Numerical Analysis of Pool Boiling on Copper Foam in the Presence of External Circulation

SSRN

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SSRN 2024年

作者： Hu, Haitao Deng, Song He, Kun Ren, Side School of Chemical Engineering Sichuan University Chengdu610065 China Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China Science Island Branch of Graduate School University of Science and Technology of China Hefei230026 China School of Chemical Engineering and Technology Tianjin University Tianjin300350 China Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai200240 China

In the present study, the pool boiling heat transfer of methanol on copper foams under exter-nal circulation conditions is investigated. The Couple Level Set and Volume of Fluid (CLSVOF) model and a user-defined function (UDF) written in C language are used to simulate the boil-ing on copper foams under external circulation conditions. The behaviors of bubble motion in copper foams under external circulation conditions are revealed, and the effects of flowrate on temperature and pressure fields are further analyzed. The influence of bubble behaviors was observed to be affected by various factors such as the metal skeleton, surrounding bubbles, and the boundary conditions for outlet and external circulation conditions. The increased flow rate results in greater liquid replenishment and accelerates bubble updating and the update rate of the bottom bubble increases by 1.5 times, resulting in a 23% increase in the maximum heat transfer coefficient, which in turn allows an uneven temperature distribution around the copper foam skeletons. The horizontal temperature distribution shows an initial increase foll-owed by a decrease, while the vertical distribution decreases steadily. It is worth noting that an increase in the forced liquid flow rate does not cause significant fluctuations or varia-tions in pressure drop, the pressure drop increases in the range of 1-4 Pa and the fluctuation range is 10-70 Pa, leading to a more stable heat exchange process. The research results pro-vide some reference for the design of safe and stable heat exchange systems. © 2024, The Authors. All rights reserved.

关键词： Pressure drop

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Analysis of Some Parameters of Synthesized Anodized Aluminum Oxide Matrices 17

Analysis of Some Parameters of Synthesized Anodized Aluminum...

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17th IEEE International Conference on Advanced Trends in Radioelectronics, Telecommunications and Computer Engineering, TCSET 2024

作者： Bukliv, Roxoliana Adamiv, Volodymyr Bordun, Ihor Andrushchak, Nazariy Teslyuk, Ihor Andrushchak, Anatoliy Institute of Chemistry and Chemical Technologies Lviv Polytechnic National University Department of Chemistry and Technology of Inorganic Substances Lviv Ukraine O. G. Vlokh Institute of Physical Opics Ivan Franko National University of Lviv Lviv Ukraine Czestochowa University of Technology Department of Electrical Power Engineering Czestochowa Poland Lviv Polytechnic National University Department of Ecology and Sustainable Environmental Management Lviv Ukraine Lviv Politechnic National University Computer-Aided Design Systems Lviv Ukraine Lviv Polytechnic National University Department of Applied Physics and Nanomaterials Science Lviv Ukraine

ISBN: (纸本)9798331520564

Studies have been conducted on anodized aluminum oxide (AAO) nanomatrices manufactured by SmartMembranes (SM) (Germany) and InRedox (USA). An X-ray fluorescence analyzer determined the quantitative and qualitative composition of AAO matrices. It is shown that the AAO matrices have a large transparency window (250 - 2750 nm) and the dependence of the second harmonic generation (SHG) signal on the pore size. The parameters of the porous structure of the samples were estimated by isothermal processes of nitrogen adsorption/desorption at its boiling point (T = 77 K). © 2024 IEEE.

关键词： Harmonic generation

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Surface Oxygen Vacancy and Hydride Species on Ceria Are Detrimental to Acetylene Semihydrogenation Reaction

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ACS Catalysis 2023年第8期13卷 5213-5224页

作者： Li, Zhaorui Chen, Lu Wu, Zongfang Jia, AiPing Shi, Shucheng Zhang, Hui Wang, Jia Liu, Zhi Shao, Wei-Peng Yang, Fan Wu, Xin-Ping Gong, Xue-Qing Huang, Weixin Key Laboratory of Precise and Intelligent Chemistry iChEM Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Centre for Computational Chemistry and Research Institute of Industrial Catalysis School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China Hefei National Research Center for Physical Science at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes University of Science and Technology of China Hefei 230026 China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 China School of Physical Science and Technology Shanghai Tech University Shanghai 201210 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences Dalian 116023 China

Reactivity of OH and hydride species in oxide-catalyzed hydrogenation reactions has attracted great interest. Herein, we report a combined in situ spectroscopic characterization and density functional theory (DFT) calculation study of ceria-catalyzed acetylene semihydrogenation reaction. The ceria surface is fully hydroxylated during the adopted reaction condition. C₂H₂ adsorbs molecularly on the stoichiometric CeO₂ surface and hydrogenates with OH groups selectively to produce C₂H₄. Semihydrogenation of C₂H₂ to C₂H₄ with either OH groups or hydride species on ceria surfaces with surface oxygen vacancies proceeds more facilely than on a stoichiometric CeO₂ surface, but C₂H₄ adsorbs more strongly and further hydrogenates to C₂H₆ more facilely;moreover, dissociative adsorption of C₂H₂ to C₂H species occurs, which facilely hydrogenates with the hydride species eventually to form C₂H₆ and react with each other to produce oligomers, decreasing the catalytic selectivity and stability, respectively. These results demonstrate that the ceria catalyst with a stoichiometric surface is extremely selective in catalyzing C₂H₂ semihydrogenation reaction to C₂H₄, whereas surface oxygen vacancies or hydride species on ceria are harmful to the catalytic performance. © 2023 American chemical Society.

关键词： active species DFT calculations heterogeneous catalysis in situ characterization reaction mechanism

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Optimization of Creep Constitutive Modeling of Lead-Free Solder Using Gene Expression programming Methods

Optimization of Creep Constitutive Modeling of Lead-Free Sol...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Wei Chen Xu He Xiaowei Xu Lu Liu Department of physics Nanjing University of science and technology Nanjing China Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin China National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

In this paper, the GEP method is utilized to derive an ontological model for creep data, focusing on the mechanical properties and structural deformation mechanisms of solder at different scales. By analyzing the effect of micro-and meso-structural morphology on the material, experimental validation is provided for the construction of an ontological model that depicts the viscoplasticity of Pb- Free solder in detail. Iterative optimization of a larger population of experimental samples will drive the development of a fine-grained intrinsic model that will be supported by solid theoretical and empirical evidence, advancing the field towards deeper understanding and innovation. In this study, the GEP algorithm is used to fit the intrinsic model of solder creep and is shown to have good fitting results. The advantages of GEP in equation model fitting are the simplicity of its heuristic algorithm, the ease of its implementation and its good optimization results. In addition, GEP is highly flexible, adaptable and robust to noisy data. After comparing the experimental data simulations, it is found that GEP is able to accurately analyze and predict in the establishment and optimization of creep model, which brings an important contribution to the field of solder research.

关键词： Adaptation models Analytical models Creep Lead programming Predictive models Prediction algorithms

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Post-selection shifts the transition frequency of helium in an atomic beam

arXiv

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arXiv 2024年

作者： Wen, Jin-Lu Tang, Jia-Dong Lv, Ya-Nan Sun, Yu R. Zou, Chang-Ling Dong, Jun-Feng Hu, Shui-Ming Department of Chemical Physics University of Science and Technology of China Hefei230026 China Hefei National Research Center of Physical Sciences at the Microscale University of Science and Technology of China Hefei230026 China Institute of Advanced Science Facilities Shenzhen518107 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China

Post-selecting output states in measurements can effectively amplify weak signals and improve precision. However, post-selection effects may also introduce unintended biases in precision measurements. Here, we investigate the influence of post-selection in the precision spectroscopy of the 23S − 23P transition of helium (4He) using an atomic beam. We directly observe that post-selection based on atomic positions causes a shift in the measured transition frequency, amounting to approximately -55 kHz. After accounting for this post-selection shift, we obtain a corrected frequency of 276,764,094,712.45 ± 0.86 kHz for the 23S1 − 23P0 transition. Combining this result with existing data for 3He, we derive a new value for the difference in squared nuclear charge radii, δr2[rh2 −rα2] = 1.0733±0.0021 fm2. This value shows a 2.8σ deviation from measurements of muonic helium ions, potentially pointing to new physics that challenges lepton universality in quantum electrodynamics. © 2024, CC BY-NC-ND.

关键词： Atoms

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Oxygen-Incorporated Lithium-Rich Iron Sulfide Cathodes for Li-Ion Batteries with Boosted Material Stability and Electrochemical Performance

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Chemistry of Materials 2024年第19期36卷 9370-9379页

作者： Hailemariam, Adane G. Syum, Zeru Mamo, Tadios T. Qorbani, Mohammad Hsing, Cheng-Rong Sabbah, Amr Quadir, Shaham Bayikadi, Khasim S. Wu, Heng-Liang Wei, Ching-Ming Chen, Li-Chyong Chen, Kuei-Hsien Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Sustainable Chemical Science and Technology Taiwan International Graduate Program Academia Sinica Nangang Taipei11529 Taiwan Institute of Chemistry Academia Sinica Nangang Taipei11529 Taiwan Department of Applied Chemistry National Yang-Ming Chiao Tung University Hsinchu30010 Taiwan Department of Chemistry College of Natural Science Dire Dawa University Dire Dawa1362 Ethiopia Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Department of Chemistry National Taiwan University Taipei10617 Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica Nangang Taipei11529 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Division of Natural Science Center for General Education Chang Gung University Taoyuan City33302 Taiwan Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo11421 Egypt GoldenCO80401 United States Department of Chemistry Northwestern University EvanstonIL60208 United States National Synchrotron Radiation Research Center Hsinchu30092 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan

Affordable and environmentally friendly electrode materials with multielectron redox reactions are imperative for the advancement of next-generation Li-ion batteries. In this context, the Li-rich layered iron sulfide cathode material (i.e., Li2FeS2) stands out as a promising candidate due to its unique multielectron cationic and anionic redox features. However, its practical application is hampered by inherent limitations in terms of poor structural stability and cycling performance. Herein, we conduct a systematic investigation into the impact of anionic substitution, where sulfur is partially replaced with oxygen, on the structural stability, intrinsic conductivity, and electrochemical properties of the Li2FeS2 cathode. First-principle calculations confirm that an optimum amount of oxygen incorporation is beneficial to stabilize the crystal structure and improve Li ion diffusion. Furthermore, cathodes with oxygen incorporation exhibit significant structural stability even when exposed to air for 24 h, demonstrating resistance against moisture. The Li2FeS1.8O0.2 cathode achieves a higher Coulombic efficiency of ∼100%, charge-discharge capacity of 310 mA h g-1 after 100 cycles, and a remarkable capacity recovery of around 94% following rate capability tests spanning 75 cycles. These findings introduce an innovative anion substitution approach for the development of Li-rich layered sulfide cathode materials, effectively mitigating structural deterioration. © 2024 American chemical Society.

关键词： Cathodes

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Inelastic squared form factors of the vibronic states of B1Σu+, C1Πu, and EF1Σg+ for molecular D2 studied by high-energy electron scattering

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physical Review A 2023年第2期107卷 022803-022803页

作者： Ya-Wei Liu Shu-Xing Wang Long-Quan Xu Yi-Geng Peng Song-Bin Zhang Yong Wu Jian-Guo Wang Lin-Fan Zhu Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei Anhui 230026 People's Republic of China Anhui Province Key Laboratory of Medical Physics and Technology Institute of Health and Medical Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei Anhui 230031 People's Republic of China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100088 People's Republic of China School of Physics and Information Technology Shaanxi Normal University Xi'an Shaanxi 710119 People's Republic of China HEDPS Center for Applied Physics and Technology Peking University Beijing 100084 People's Republic of China

The inelastic squared form factors of the valence-shell excitations of D2 were measured by high-energy electron scattering and calculated by the multireference single- and double-excitation configuration interaction method in the present work. It is found that for the B1Σu+ state of D2, the theoretical calculation cannot satisfactorily reproduce the inelastic squared form factors with a higher vibrational quantum number. For the vibronic states of C1Πu and EF1Σg+ of D2, obvious discrepancies between our electron-scattering results and theoretical calculations are found. Similar phenomena observed for H2, HD, and D2 may be attributed to electronic-vibrational coupling and the failure of the first Born approximation at an incident electron energy of 1500 eV. Furthermore, the present inelastic squared form factors of D2 are in good agreement with the ones of H2 and HD, which indicates that there is no isotope effect for the electronic matrix elements of H2, HD, and D2 in the momentum space.

关键词： Atomic & molecular collisions Electronic excitation & ionization Electronic structure of atoms & molecules

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Magnetic Weyl and quadratic nodal lines in inverse-Heusler-based fully compensated ferrimagnetic half-metals

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physical Review Materials 2022年第9期6卷 094406-094406页

作者： Chengwu Xie Hongkuan Yuan Zeying Zhang Xiaotian Wang School of Physical Science and Technology Southwest University Chongqing 400715 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China Institute for Superconducting and Electronic Materials (ISEM) University of Wollongong Wollongong 2500 Australia

Heusler alloys, a class of easily prepared, highly ordered intermetallic compounds, were first reported in 1903. Since then, Heusler alloys have presented various physical phenomena in modern condensed-matter physics. Among Heusler alloys, Heusler-based fully compensated ferrimagnetic half-metals (FCF-HMs) are, particularly, relevant because they host fully spin polarization and have no net magnetic moment, making them have no stray field and less affected by external magnetic fields. Based on first-principles calculations and a tight-binding Hamiltonian model, we provide new insight into inverse-Heusler-based (IHB) FCF-HMs and reveal that they exhibit spin-polarized Weyl and quadratic nodal lines as well as spin-polarized drumheadlike surface states. This paper presents the electron-filling-based design rule and material candidates for IHB FCF-HMs and suggests that IHB FCF-HMs are promising candidates for follow-up investigations in the field of topological spintronics. Subsequent experimental confirmation of the topological states in IHB FCF-HMs is imminent.

关键词： Electronic structure Magnetism Half-metals Heusler alloy Node-line semimetals Density functional theory Tight-binding model

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