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Hard X-ray focusing resolution and efficiency test with a thickness correction multilayer Laue lens

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Nuclear Science and Techniques 2022年第9期33卷 101-110页

作者： Shuai-peng yue Liang Zhou Yi-Ming Yang Hong Shi Bin Ji Ming Li peng Liu Ru-Yu Yan Jing-Tao Zhu Guang-cai Chang Institute of High Energy Physics Chinese Academy of Sciences19B Yuquan RoadBeijing 100049China University of Chinese Academy of Sciences 19A Yuquan RoadBeijing 100049China School of Physics Science and Engineering Tongji University1239 Siping RoadYangpu DistrictShanghai 200092China

The multilayer Laue lens(MLL) is a diffractive focusing optical element which can focus hard X-rays down to the nanometer scale. In this study, a WSi_(2)/Si multilayer structure consisting of 1736 layers, with a 7.2-nm-thick outermost layer and a total thickness of 17 μm, is prepared by DC magnetron sputtering. Regarding the thin film growth rate calibration, we correct the long-term growth rate drift from 2 to 0.6%, as measured by the grazing incidence X-ray reflectivity(GIXRR). A one-dimensional line focusing resolution of 64 nm was achieved,while the diffraction efficiency was 38% of the-1 order of the MLL Shanghai Synchrotron Radiation Facility(SSRF) with the BL15U beamline.

关键词： Synchrotron radiation Multilayer Laue lens DC magnetron sputtering Grazing incidence X-ray reflectivity Hard X-ray nanofocusing

Analysis of Power Matching on Energy Savings of a Pneumatic Rotary Actuator Servo-Control System

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Chinese Journal of Mechanical Engineering 2020年第2期33卷 87-99页

作者： Yeming Zhang Hongwei yue Ke Li Maolin cai School of Mechanical and Power Engineering Henan Polytechnic UniversityJiaozuo 454000China School of Mechanical and Electrical Engineering Harbin Institute of TechnologyHarbin 150001China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

When saving energy in a pneumatic system,the problem of energy losses is usually solved by reducing the air supply *** power-matching method is applied to optimize the air-supply pressure of the pneumatic system,and the energy-saving effect is verified by ***,the experimental platform of a pneumatic rotary actuator servo-control system is built,and the mechanism of the valve-controlled cylinder system is ***,the output power characteristics and load characteristics of the system are derived,and their characteristic curves are *** employed air compressor is considered as a constant-pressure source of a quantitative pump,and the power characteristic of the system is *** power source characteristic curve should envelope the output characteristic curve and load characteristic *** minimum gas supply pressure obtained by power matching represents the optimal gas supply *** comparative experiments under two different gas supply pressure conditions show that the system under the optimal gas supply pressure can greatly reduce energy losses.

关键词： Pneumatic rotary actuator Energy savings Gas supply pressure Characteristic curve Power matching

Highest Weight Representations of a Family of Lie Algebras of Block Type

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Acta Mathematica Sinica,English Series 2008年第4期24卷 687-696页

作者： Xiao Qing yue Yu cai SU Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 P. R. China Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China

For an additive subgroup G of a field F of characteristic zero, a Lie algebra B（G） of Block type is defined with basis {Lα,i｜ α∈G, i∈Z＋} and relations [Lα,i, Lβ,j] = （β-α）Lα＋β,i＋j＋（αj-βi）Lα＋β,Lα＋β,i＋*** is proved that an irreducible highest weight B（Z）-module is quasifinite if and only if it is a proper quotient of a Verma module. Furthermore, for a total order λ on G and any ∧∈B（G）0^＊（the dual space of B（G）0 = span{L0,i｜i∈Z＋}）, a Verma B（G）-module M（∧,λ） is defined, and the irreducibility of M（A,λ） is completely determined.

关键词： Verma modules Lie algebras of Block type irreducibility quasifinite

Non-Lie Symmetry Groups of （2＋1）-Dimensional Nonlinear Systems

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Communications in Theoretical Physics 2006年第6X期46卷 1005-1010页

作者： MA Hong-cai LOU Sen-yue Department of Mathematics Donghua University Shanghai 200051 China Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Center of Nonlinear Science Ningbo University Ningbo 315211 China

A modified direct method is developed to find finite symmetry groups of nonlinear mathematical physics systems. Applying the modified direct method to the well-known （2＋1）-dimensional asymmetric Nizhnik-Novikov-Vesselov equation and Nizhnik Novikov-Vesselov equation, both the Lie point symmetry groups and the non-Lie symmetry groups are obtained. The Lie symmetry groups obtained via traditional Lie approaches are only speciai cases. Furthermore, the expressions of the exact finite transformations of the Lie groups are much simpler than those obtained via the standard approaches.

关键词： symmetry groups CK direct method symmetries exact solution

Modified silicon carbide whisker reinforced polybenzimidazole used for high temperature proton exchange membrane

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Journal of Energy Chemistry 2018年第3期27卷 820-825页

作者： Yangben cai Zhouying yue Qianlu Jiang Shiai Xu Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology School of Chemical Engineering Qinghai University

Polybenzimidazole containing ether bond（OPBI） was reinforced with silicon carbide whisker（m Si C） modified by 3-aminopropyltriethoxysilane（KH550）, and then doped with phosphoric acid（PA） to obtain OPBI/m Si C/PA membranes. These OPBI/m Si C/PA membranes have excellent mechanical strength and oxidative stability and can be used for high temperature proton exchange membrane（HT-PEM）. The tensile strength of OPBI/m Si C/PA membranes ranges from 27.3 to 36.8 MPa, and it increases at first and then decreases with the increase of m Si C content. The high m Si C content and PA doping level contribute to improving the proton conductivity of membranes. The proton conductivity of PBI/m Si C-10/PA membrane is 27.1 m S cm-1 at 170℃ without humidity, with an increase of 55.7% compared with that of OPBI/PA membrane. These excellent properties make OPBI/m Si C/PA membranes promising membrane materials for HT-PEM applications.

关键词： Polybenzimidazole Silicon carbide whisker Phosphoric acid doping Proton exchange membrane Proton conductivity

Nickel sulfide-based energy storage materials for high-performance electrochemical capacitors

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Rare Metals 2021年第2期40卷 353-373页

作者： Ramyakrishna Pothu Ravi Bolagam Qing-Hong Wang Wei Ni Jin-Feng cai Xiao-Xin peng yue-Zhan Feng Jian-Min Ma School of Physics and Electronics Hunan UniversityChangsha410082China School of Chemistry and Materials Science Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional MaterialsJiangsu Normal UniversityXuzhou221116China Institute for Advanced Study Chengdu UniversityChengdu610106China Faculty of Technology University of OuluOulu90014Finland Yiyang Wanjingyuan Electronics Co. Ltd.Yiyang413000China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou450002China

Supercapacitors are favorable energy storage devices in the field of emerging energy technologies with high power density,excellent cycle stability and environmental *** performance of supercapacitors is definitively influenced by the electrode *** sulfides have attracted extensive interest in recent years due to their specific merits for supercapacitor ***,the distribution of electrochemically active sites critically limits their electrochemical *** improvements have been achieved through various strategies such as building synergetic structures with conductive substrates,enhancing the active sites by nanocrystallization and constructing nanohybrid architecture with other electrode *** article overviews the progress in the reasonable design and preparation of nickel sulfides and their composite electrodes combined with various bifunctional electric double-layer capacitor(EDLC)-based substances(e.g.,graphene,hollow carbon)and pseudocapacitive materials(e.g.,transition-metal oxides,sulfides,nitrides).Moreover,the corresponding electrochemical performances,reaction mechanisms,emerging challenges and future perspectives are briefly discussed and summarized.

关键词： Supercapacitors Nickel sulfides Hybrid structures Energy storage materials Pseudocapacitance

Faecal microbiota transplantation enhances efficacy of immune checkpoint inhibitors therapy against cancer

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World Journal of Gastroenterology 2021年第32期27卷 5362-5375页

作者： Yong-Bo Kang yue cai Department of Microbiology and Immunology School of Basic Medical SciencesShanxi Medical UniversityJinzhong 030600Shanxi ProvinceChina

Even though immune checkpoint inhibitors(ICIs)are effective on multiple cancer types,there are still many non-responding patients.A possible factor put forward that may influence the efficacy of ICIs is the gut ***,faecal microbiota transplantation may enhance efficacy of ***,the data available in this field are insufficient,and relevant scientific work has just *** a result,the current work reviewed the latest research on the association of gut microbiota with ICI treatments based on anti-programmed cell death protein 1 antibody and anti-cytotoxic T-lymphocyte-associated protein 4 antibody and explored the therapeutic potential of faecal microbiota transplantation in combination with ICI therapy in the future.

关键词： Gut microbiome Immunotherapy Programmed cell death protein 1/programmed cell death protein ligand 1 Cytotoxic T-lymphocyte-associated protein 4 Immune checkpoint inhibitors resistance Faecal microbiota transplantation

New Matrix Loop Algebra and Its Application

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Communications in Theoretical Physics 2008年第8期50卷 321-325页

作者： DONG Huan-He XU yue-cai College of Information Science and Engineering Shandong University of Science and Technology Qingdao 266510 China College of Continuing Education Shangdong University of Science and Technology Taian 271000 China

A new matrix Lie algebra and its corresponding Loop algebra are constructed firstly,as its application,the multi-component TC equation hierarchy is obtained,then by use of trace identity the Hamiltonian structure of the above system is ***,the integrable couplings of the obtained system is worked out by the expanding matrix Loop algebra.

关键词： matrix loop algebra Liouville integrable system Hamiltonian structure integrable couplings

Micro segment analysis of supercritical methane thermal-hydraulic performance and pseudo-boiling in a PCHE straight channel

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Petroleum Science 2024年第2期21卷 1275-1289页

作者： Qian Li Zi-Jie Lin Liu Yang yue Wang yue Li Wei-Hua cai Laboratory of Thermo-Fluid Science and Nuclear Engineering Northeast Electric Power UniversityJilin132000JilinChina School of Energy and Power Engineering Northeast Electric Power UniversityJilin132000JilinChina

The printed circuit heat exchanger(PCHE) is receiving wide attention as a new kind of compact heat exchanger and is considered as a promising vaporizer in the LNG process. In this paper, a PCHE straight channel in the length of 500 mm is established, with a semicircular cross section in a diameter of 1.2 *** simulation is employed to investigate the flow and heat transfer performance of supercritical methane in the channel. The pseudo-boiling theory is adopted and the liquid-like, two-phase-like, and vapor-like regimes are divided for supercritical methane to analyze the heat transfer and flow *** results are presented in micro segment to show the local convective heat transfer coefficient and pressure drop. It shows that the convective heat transfer coefficient in segments along the channel has a significant peak feature near the pseudo-critical point and a heat transfer deterioration when the average fluid temperature in the segment is higher than the pseudo-critical point. The reason is explained with the generation of vapor-like film near the channel wall that the peak feature related to a nucleateboiling-like state and heat transfer deterioration related to a film-boiling-like state. The effects of parameters, including mass flow rate, pressure, and wall heat flux on flow and heat transfer were *** calculating of the averaged heat transfer coefficient of the whole channel, the traditional method shows significant deviation and the micro segment weighted average method is adopted. The pressure drop can mainly be affected by the mass flux and pressure and little affected by the wall heat flux. The peak of the convective heat transfer coefficient can only form at high mass flux, low wall heat flux, and near critical pressure, in which condition the nucleate-boiling-like state is easier to appear. Moreover,heat transfer deterioration will always appear, since the supercritical flow will finally develop into a filmboiling-like state. So hea

关键词： Printed circuit heat exchanger Vaporization Supercritical methane Pseudo-boiling Micro segment analysis