检索结果-内蒙古大学图书馆

Arranging cation mixing and charge compensation of TiNb_(2)O_(7) with W^(6+) doping for high lithium storage performance

引用

Rare Metals 2023年第10期42卷 3364-3377页

作者： Pei Cui Guo-Tai Li Pan-Pan Zhang Tao Wan Mei-Qing Li Xue-Li Chen Yu Zhou Rui-Qiang Guo Ming-Ru Su Yun-Jian Liu De-Wei Chu School of Material Science and Engineering Jiangsu UniversityZhenjiang212013China Thermal Science Research Center Shandong Institute of Advanced TechnologyJinan250103China Institute of Thermal Science and Technology Shandong UniversityJinan250061China School of Materials Science and Engineering The University of New South WalesSydneyNSW2502Australia

TiNb_(2)O_(7) is an advanced anode material for high-energy density lithium-ion batteries(LIBs) due to its considerable specific capacity and satisfactory ***,its rate capability is limited by its poor ionic conductivity and electronic *** solve this problem,TiNb_(2)O_(7) with W^(6+) doping was synthesized by a convenient solid-state *** doping of W^(6+) will lead to arranging cation mixing and charge *** cation rearrangement creates a new Li-conductive environment for lithiation,resulting in a low-energy barrier and the fast Li^(+)storage/*** results show that the Li^(+)diffusion coefficient of W_(0.06)Ti_(0.91)Nb_(2)O_(7) is increased by 9.96 times greater than that of TiNb_(2)O_(7).Besides,as the calculation proves,due to the partial reduction of the Nb^(5+)and Ti^(4+) caused by charge compensation,W^(6+)doping results in low charge transfer resistance and excellent electronic ***,W^(6+) doping accounts for a high pseudocapacitive *** the scan rate of 1 mV·s^(-1),the pseudocapacitive contribution for TiNb_(2)O_(7) is 78%,while that for W_(0.06)Ti_(0.91)Nb_(2)O_(7) increases to 83%.The reversible specific capacity of W_(0.06)Ti_(0.91)Nb_(2)O_(7) after 600 cycles is maintained at 148.90mAh·g^(-1) with a loss of only 16.37% at ***,it delivers a commendable capacity of 161.99 mAh·g^(-1) *** at 30.0C,it still retains a satisfactory capacity of 147.22 mAh·g^(-1),much higher than TiNb_(2)O_(7)(97.49mAh·g^(-1)).Our present study provides ideas for the development of electrode materials for lithium-ion batteries.

关键词： Lithium-ion batteries(LIBs) Titanium niobium oxide W^(6+)doping High-rate capability

来源：评论

学校读者我要写书评

暂无评论

Accelerating computation of CGH using convolutional symmetric compressed LUT method in 360° dynamic color 3D holographic display

Accelerating computation of CGH using convolutional symmetri...

引用

International Workshop on Holography and Related Technologies, IWH 2022 and 2023

作者： Wei, Jiahao Liu, Juan Beijing Engineering Research Center for Mixed Reality and Advanced Display MoE Key Lab of Photoelectronic Imaging Technology and System School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

ISBN: (数字)9781510674530

ISBN: (纸本)9781510674523

In 360° color three-dimensional (3D) holographic display, numerous color computer-generated holograms (CCGH) are required to achieve compact distribution of view window on the viewing circumstance band [1]. However, traditional look-up-table methods cannot meet the needs of massive computing. This paper proposes a convolutional symmetric compressed look-up-table (CSC-LUT) method to accelerate CCGH computation based on the Fresnel diffraction theory and LUT. The proposed method can achieve one-time high-quality fast generation of CCGH by utilizing dynamic convolution operation, which is divided three processes. Firstly, the pre-calculated data of maximum horizontal modulation factor is compressed in 1D array by coordinate symmetry. Then, the test object is resampled to satisfy convolutional translation invariance. Finally, the dynamic convolution operation is used to simplify CCGH computation process rather than the point-by-point computation. Numerical simulation and optical experimental results show that our proposed method can achieve faster computation speed, higher reconstruction quality and wider application compared to conventional SC-LUT method. The further optimization method for parallel acceleration on the GPU framework can achieve real-time (>24fps) color holographic display corresponding to three perspectives of a 3D scene. © 2024 SPIE.

关键词： Color

来源：评论

学校读者我要写书评

暂无评论

Effect of Al addition and heat treatment on the microstructures and corrosion resistance of Mg-Cu alloys

引用

Journal of materials Science & technology 2022年第3期98卷 219-232页

作者： X.W.Wang W.Wang W.Chen D.M.Chen Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China College of Material Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The effects of Al content and annealing condition on the microstructures and corrosion performances of Mg-3 wt.%Cu-xAl(x=0,4 wt.%,8 wt.%)alloys were *** Mg-3 wt.%Cu alloy contains Mg_(2)Cu phase,but Al-bearing alloys contain MgAlCu and Mg_(17)Al_(12) *** Mg_(2)Cu and MgAlCu phases exhibit much higher Volta potential compared to Mg_(17)Al_(12) and α-Mg,and their volume fractions are related to Al content of alloys and annealing *** weight loss measurement and electrochemical tests are conducted to explore the corrosion performances of *** close relationship between weight loss rate of alloys and volume fraction of Cu-bearing phases indicates that the corrosion performances of alloys can be controlled by adjusting Al content of alloys and annealing conditions.

关键词： Magnesium Intermetallics Weight loss EIS(electrochemical impedance spectroscopy)

来源：评论

学校读者我要写书评

暂无评论

Emerging of Ag particles on ZnO nanowire arrays for blue-ray hologram storage

引用

Chinese Physics B 2022年第3期31卷 418-423页

作者： Ning Li Xin Li Ming-Yue Zhang Jing-Ying Miao Shen-Cheng Fu Xin-Tong Zhang Center for Advanced Optoelectronic Functional Material Research Northeast Normal UniversityChangchun 130024China Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University) Ministry of EducationChangchun 130024China

Noble-metal/metal-oxide-semiconductor nanostructures as an important material platform have been applied in massive data storage. ZnO exhibits excellent optical modulation ability. However, plasmon induced charge separation effect in Ag/ZnO systems is very weak due to the low chemical activity on surface of the oxide. Herein, we prepare ZnO nanowire arrays via the hydrothermal method, and measure their absorption spectra, photoluminescence spectra and electron paramagnetic resonance, proving the existence of oxygen defects in ZnO. Accordingly, an idea of “electron reverse transfer” is proposed such that blue-ray(403.4 nm) induces reduction of Ag^(+) ions through the excitation of ZnO. Rod-like and spherical silver nanoparticles emerge on the surface and in the gap of ZnO nanowire arrays, respectively, after the visible light stimulus. It is found that nanowire density, oxygen defects and surface roughness are dependent on hydrothermal time. The optimized diffraction efficiency of 0.08% is obtained for reconstructing hologram in the nanocomposite film. This work provides a bright way for construction of ZnO-based optoelectronic integrated devices.

关键词： holographic ZnO nanowires Ag nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Influence of pH value and Zn/Ce cations ratio on the microstructures and corrosion resistance of LDH coating on AZ31

引用

Corrosion Communications 2022年第1期5卷 73-86页

作者： Vahdat Zahedi Asl Jingmao Zhao Yahya Palizdar Muhammad Junaid Anjum College of Material Science and Engineering Beijing University of Chemical Technology Beijing Key Laboratory of Electrochemical Process and Technology for Materials Nanotechnology and Advanced Materials Department Materials and Energy Research Center

To prepare a compact and anti-corrosion Zn-Ce LDH coating on AZ31 magnesium alloy,the various molar ratios of Zn/Ce cations,and different pH values were employed during preparation of the precursor *** composition,morphology,structure,and wettability of the deposited coatings were comprehensively characterized via scanning electronic microscopy （SEM）,energy-dispersive X-ray spectroscopy （EDS）,X-ray diffraction （XRD）,X-ray photoelectron spectroscopy （XPS）,Fourier transform infrared spectroscopy （FT-IR） and the static sessile drop ***,potentiodynamic polarization （PDP） and electrochemical impedance spectroscopy （EIS）measurements were conducted to evaluate the corrosion resistance of the coatings ***,the selfhealing ability of the coating was investigated by monitoring the scratched areas of the samples immersed in 3.5%NaCl solution for a long time up to 21 *** results reveal that the coated Mg alloy shows the lowest corrosion current density (icorr=1.29×10-8A/cm2) when the Zn/Ce ratio is 2,and the pH value of the precursor solution is approximately 11.

关键词： LDH coating Magnesium alloy Corrosion protection Self-healing Cerium XPS

来源：评论

学校读者我要写书评

暂无评论

Improved Spallation Resistance of the Oxide Scale by Hf/Y Co-doping in Ni-Based Superalloy at High Temperature

引用

Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1744-1758页

作者： Khalil Rehman Naicheng Sheng Shigang Fan Shijie Sun Guicheng Hou Yizhou Zhou Xiaofeng Sun Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Material Science and Engineering University of Science and Technology of ChinaHefei230026China

Ni-based superalloys added with comparably higher concentrations of single-doped Hf and co-doped Hf/Y are prepared by vacuum induction melting(VIM).The oxidation properties up to 300 h at 900℃,1000℃,and 1100℃ are *** undoped alloy exhibited a minimum oxidation rate at 900℃ and 1000℃.The co-doped alloy showed a higher oxidation rate;however,it possesses better scale adhesion,and no spallation ***-doped alloy showed a lower oxidation rate and better scale adhesion at 900℃ and 1000℃,but exhibited a shorter lifetime at 1100℃.The spallation of the Hf-doped alloy is attributed to the precipitation of the HfO2 in and beneath the oxide *** spallation in the undoped alloy is accredited to the thermal expansion mismatch between the growing oxide scale and superalloy *** two reactive elements(REs)in alloy minimized the precipitation of RE oxide in the oxide scale,diminished internal oxidation in the alloy,and decreased oxide scale spallation.

关键词： Superalloys Reactive elements Oxidation kinetics Microstructure Spallation resistance

来源：评论

学校读者我要写书评

暂无评论

Analysis of the Minute Differences between the Internal Structures of Green-Emitting Quantum Dots Via Synchrotron-Based X-Ray Photoelectron Spectroscopy

引用

Energy & Environmental materials 2025年第1期8卷 313-322页

作者： Dong-Jin Yun Nayoun Won Young Mo Sung Tae-Gon Kim Taekhoon Kim Ane Etxebarria Kyungjae Lee SooHwan Sul Hyokeun Park SungJun Park Jung-Hwa Kim Shinae Jun Ethan Crumlin Material Research Center of Samsung Advanced Institute of Technology Suwon 440-600Korea Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Centre for Cooperative Research on Alternative Energies(CIC energiGUNE) Basque Research and Technology Alliance(BRTA)Alava Technology ParkAlbert Einstein 4801510Vitoria-GasteizSpain Departamento de Física de la Materia Condensada Facultad de Ciencia y TecnologíaUniversidad del País Vasco(UPV/EHU)Apdo 64448080BilbaoSpain Chemical Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

The development of an analytical method for determining the properties of quantum dots(QDs)is crucial for improving the optical performance of QD-based ***,synchrotron-based X-ray photoelectron spectroscopy(XPS)is designed here to accurately characterize the chemical and structural differences between different *** method enables the determination of the reason for the minimal differences between the optical properties of different QDs depending on the synthesis process,which is difficult to determine using conventional methods *** with model simulations,the XPS spectra obtained at different photon energies reveal the internal structures and chemical-state distributions of the *** particular,the QD synthesized under optimal conditions demonstrates a relatively lower degree of oxidation of the core and more uniformly stacked ZnSe/ZnS shell *** internal structures and chemical-state distributions of QDs are closely related to their optical ***,the synchrotron-based XPS proposed here can be applied to compare nearly equivalent QDs with slightly different optical properties.

关键词： chemical state indium phosphide-based quantum dot inelastic mean free path internal structure synchrotron-based X-ray photoelectron spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Intense low-noise terahertz generation by relativistic laser irradiating near-critical-density plasma

引用

Chinese Physics B 2023年第3期32卷 363-369页

作者：张世杰周维民银燕邹德滨赵娜谢端卓红斌 Department of Physics National University of Defense TechnologyChangsha 410073China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterChina Academy of Engineering Physics(CAEP)Mianyang 621900China Center for Advanced Material Diagnostic Technology Shenzhen Technology UniversityShenzhen 518118China School of Microelectronics and Physics Hunan University of Technology and BusinessChangsha 410205China School of Electronic Information and Electrical Engineering Changsha UniversityChangsha 410003China

Low-noise terahertz(THz)radiation over 100 MV/cm generation by a linearly-polarized relativistic laser pulse interacting with a near-critical-density(NCD)plasma slab is studied by theory and particle-in-cell(PIC)simulations.A theoretical model is established to examine the dipole-like radiation *** THz radiation is attributed to the singlecycle low-frequency surface current,which is longitudinally constrained by the quasi-equilibrium established by the laser ponderomotive force and the ponderomotively induced electrostatic *** theoretical analysis,the spatiotemporal characteristics,polarization property of the THz radiation,and the relation between the radiation strength with the initial parameters of driving laser and plasma are obtained,which are in good consistence with the PIC simulation ***,it is found by PIC simulations that the generation of thermal electrons can be suppressed within the appropriate parameter regime,resulting in a clear THz radiation *** appropriate parameter region is given for generating a low-noise intense THz radiation with peak strength reaching 100 MV/cm,which could find potential applications in nonlinear THz physics.

关键词： intense terahertz radiation relativistic laser–plasma interactions particle-in-cell simulation

来源：评论

学校读者我要写书评

暂无评论

Rotational manipulation of massive particles in a 2D acoustofluidic chamber constituted by multiple nonlinear vibration sources

引用

Chinese Physics B 2022年第4期31卷 361-372页

作者： Qiang Tang Pengzhan Liu Shuai Tang Jiangsu Provincal Engineering Research Center for Biomedical Materials and Advanced Medical Devices Faculty of Mechanical and Material EngineeringHuaiyin Institute of TechnologyHuaian 223003China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Advanced Manufacturing Technology Faculty of Mechanical and Material EngineeringHuaiyin Institute of TechnologyHuaian 223003China

Rotational manipulation of massive particles and biolo gical samples is essential for the development of miniaturized lab-on-a-chip platforms in the fields of chemical,medical,and biological *** this paper,a device concept of a two-dimensional acoustofluidic chamber actuated by multiple nonlinear vibration sources is *** functional chamber enables the generation of acoustic streaming vortices for potential applications that include strong mixing of multiphase flows and rotational manipulation of micro-/nano-scale objects without any rotating *** numerical simulations,we find that diversified acoustofluidic fields can be generated in the chamber under various actuations,and massive polystyrene beads inside can experience different acoustophoretic motions under the combined effect of an acoustic radiation force and acoustic ***,we investigate and clarify the effects of structural design on modulation of the acoustofluidic fields in the *** believe the presented study could not only provide a promising potential tool for rotational acoustofluidic manipulation,but could also bring this community some useful design insights into the achievement of desired acoustofluidic fields for assorted microfluidic applications.

关键词： acoustic streaming acoustofluidics ultrasonic vibration rotational manipulation

来源：评论

学校读者我要写书评

暂无评论

Time-energy distribution of photoelectron from atomic states with different magnetic quantum numbers in elliptically polarized laser fields

引用

Chinese Physics B 2024年第9期33卷 374-382页

作者： Jingyang Xu Li Guo Xin Qi Ronghua Lu Min Zhang Jingtao Zhang Jing Chen Department of Physics Shanghai Normal UniversityShanghai 200234China Key Laboratory for Quantum Optics and Center for Cold Atom Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

A Wigner-distribution-like(WDL)function based on the strong-field approximation(SFA)theory is used to investigate the ionization time of the photoelectron emitted from the initial states with different magnetic quantum number m in elliptically polarized electric *** saddle-point method is adopted for *** different m states,a discrepancy exists in the WDL distributions of the photoelectrons emitted in a direction close to the major axis of the laser field *** on the saddle-point analysis,this discrepancy can be ascribed to the interference between electrons ionized from two tunneling *** results show that the relationships between the tunneling instants and kinetic energy of photoelectrons are the same for different m initial states when the Coulomb potential is not *** work sheds some light on the ionization-time information of electrons from different magnetic quantum states.

关键词： strong-field ionization Wigner-distribution-like ionization instant

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：