检索结果-内蒙古大学图书馆

Decoupled thermal and electric response to external excitations in graphene

Physical Review B 2023年第14期108卷 144301-144301页

作者： Junwei Yang Wei Du Yangjie Wang Ning Wei Jige Chen School of Arts and Sciences Shanghai Dianji University Shanghai 201306 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Applied Mechanics Laboratory Department of Engineering Mechanics and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan University Wuxi 214122 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China

Thermal and electrical conductivity are the two most critical material properties in the design of miniaturized modern devices and the cooling of integrated circuits. In principle, thermal and electrical energy transport are two independent physical processes because they are associated with different energy carriers, i.e., phonons that carry heat and electric charges that carry current. However, it is still unknown how the two kinds of energy would spread in a material, such as graphene, with both high thermal conductivity and high electric conductivity at the same time in response to an external excitation. In this paper, we show that the thermal energy and electric potential energy of a graphene nanosheet exhibit quite different decoupled transport behaviors subject to an external flexural or planar excitation by using large-scale ab initio nonequilibrium molecular dynamics simulations up to thousands of atoms. It is found that the thermal energy has a higher transport velocity than the electric potential energy in response to a flexural excitation, while the electric potential energy has a higher transport velocity in response to a planar excitation. The dependence of transport behavior on the excitation strength is investigated. We find that, induced by the different responses to the excitation strength, the thermal energy and electric potential energy possess similar variations subject to the flexural excitations and opposite variations subject to the planar excitations. Anomalous diffusion of the thermal and electric potential energy in this nonequilibrium excitation process is also studied to understand the decoupled carrier mobilities. Furthermore, the cross-correlation function between the thermal energy and the electric potential energy is calculated to numerically demonstrate the decoupled variation. After an initial sharp drop, the cross-correlation function exhibits an exponential decay subject to both flexural and planar excitations. Our findings prov

关键词： Lattice dynamics 2-dimensional systems Graphene Traveling waves

来源：评论

学校读者我要写书评

暂无评论

Aqueous Sn-S Complex Derived Electron Selective Layer for Perovskite Solar Cells

引用

Journal of Wuhan University of technology(Materials Science) 2020年第2期35卷 272-279页

作者： LI Zhi SHEN Wenjian ZHAO Juan YING Hangkai WU Zhengli LIU Yifan LI Wangnan KU Zhiliang PENG Yong HUANG Fuzhi CHENG Yibing ZHONG Jie FU Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Hubei Research Center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hu-bei University of Arts and ScienceXiangyang 441053China

A novel aqueous Sn-S complex solution was applied as precursor to fabricate SnO2 electron selective layers (ESLs) for the hybrid perovskite solar cells (PSCs).The tin and sulfur powder were directly dissolved in a (NH4)2S water solution to form Sn-S *** depositon and annealing,the SnO2 film was formed,presenting as a low cost and enviromental friendly method for preparation of *** films showed excellent transmittance at visible wavelength ***,the method exhibited high compatibility for doping using Cu,Cd,Li,and Zn *** doping (0.05 M) in the as-prepared SnO2 ESL significantly improved perovskite solar cells (PSCs) *** highest PCE of 13.17% was achived with 15% enhancement compared to that of undoped SnO2 ESL ***4 modifications on SnO2 film improved photovoltaic performance to 14.45%,but resulted in the poor long-term stability,around 80% more degredation than that of PSCs based on Zn-doped SnO2 films.

关键词： perovskite solar cell aqueous solution SnO2 Sn-S complex electron selective layer

来源：评论

学校读者我要写书评

暂无评论

Investigating Tridymite: Insights from Chemical Spectroscopy and Luminescence

SSRN

引用

SSRN 2024年

作者： Balci, Sumeyra Correcher, Virgilio Topaksu, Mustafa Garcia-Guinea, Javier Sayin, Ulku Av. Complutense 22 Madrid28040 Spain Cukurova University Arts-Sciences Faculty Physics Department Adana01330 Turkey Museo Nacional de Ciencias Naturales CSIC C/José Gutiérrez Abascal 2 Madrid28006 Spain Selcuk University Science Faculty Physics Department Konya42130 Turkey Selcuk University Advanced Technology Research and Application Center Konya42130 Turkey

Tridymite is a unique volcanic mineral that can withstand extreme temperatures, but its industrial use is limited, suggesting untapped potential. Exploring its properties could reveal innovative applications, especially in ceramics and dosimetry. Additionally, tridymite’s presence on Mars could provide insights into cosmic origins, advancing our understanding of this mineral both on Earth and in space. The sample from Lanzarote, Canary Islands, Spain, was examined using a range of analytical techniques, including Environmental Scanning Electron Microscopy with Energy Dispersive Spectroscopy (ESEM-EDS), Raman spectroscopy, Nuclear Magnetic Resonance (NMR) spectroscopy, Electron Paramagnetic Resonance (EPR) spectroscopy, and luminescence techniques such as Photoluminescence (PL) and Cathodoluminescence (CL). These techniques collectively improve our comprehension of the tridymite mineral by uncovering its crystal structure, elemental configuration, chemical composition, molecular dynamics, electrical structure, and luminous capabilities. © 2024, The Authors. All rights reserved.

关键词： Scanning electron microscopy

来源：评论

学校读者我要写书评

暂无评论

Design of Finger Vein Recognition SOC Based on FPGA 7

Design of Finger Vein Recognition SOC Based on FPGA

引用

7th International Conference on Information Science and Control Engineering, ICISCE 2020

作者： Li, Jie Yang, Wenyao Shi, Yidan Nie, Zedong Chongqing University of Arts and Sciences Chongqing Engineering Research Center of New Energy Storage Devices and Applications Chongqing China Shenzhen Institutes of Advanced Technology Chinese Academy of Science Shenzhen China

ISBN: (纸本)9781728164069

Finger vein recognition technology is a new generation of biometric technology. The System on Chip (SOC) solution based on the ARM Cortex-M3 kernel and Xilinx XC7A75T FPGA for the portable finger vein recognition system was proposed in this paper. By the research of software and hardware division, the Region of Interest (ROI) extraction module with large amount of computation was designed as a hardware accelerator to improve the speed of finger vein recognition. The obtained system realized the whole process of finger vein recognition, and displayed every image processing results on 2.8 inch LCD. A large number of tests showed that the system had high stability and the recognition accuracy was greater than 97%. Using FPGA to accelerate ROI module can increase the overall recognition speed by more than 15%. This system has high application value in biometric field. © 2020 IEEE.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

Preparation of low-temperature phase MnBi by sintering in vacuum 15

Preparation of low-temperature phase MnBi by sintering in va...

引用

15th Siam Physics Congress, SPC 2020

作者： Ngamsomrit, Satienrapong Saisopa, Thanit Borsup, Jongrak Tun, Myat Su Myint, Hsu Thazin Nakajima, Hideki Songsiriritthigul, Chomphunuch Pinitsoontorn, Supree Songsiriritthigul, Prayoon Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization School of Physics Suranaree University of Technology Nakhon Ratchasima30000 Thailand Thailand Center of Excellence in Physics MHESRI Bangkok10400 Thailand Department of Applied Physics Faculty of Sciences and Liberal Arts Rajamangala University of Technology Isan Nakhon Ratchasima30000 Thailand Synchrotron Light Research Institute Muang Nakhon Ratchasima30000 Thailand Khon Kaen University Khon Kaen40002 Thailand

A simple vacuum sintering system was set up to prepare low-temperature phase manganese-bismuth compound (LTP-MnBi). A mixture of Mn and Bi powders with 1:1 atomic ratio was sintered at 275 °C for 3, 6, 9 and 12 hours. The morphology of the sintered materials was investigated by SEM. The sintered product was further identified by XRD and energy dispersive spectroscopy and found to be LTP-MnBi, Mn and Bi. Sintering in vacuum could prevent the formation of manganese oxides. The magnetic properties of the sintered materials were characterized by using a vibrating sample magnetometer. The coercivity and the saturated magnetization were found to be 2.5 kOe and 42.4 emu/g, respectively. The maximum energy product of this magnetic materials was about 1.7 MGOe. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.

关键词： Bismuth compounds

来源：评论

学校读者我要写书评

暂无评论

Value co-creation in tourism and hospitality: A systematic literature review

引用

European Management Journal 2023年第6期41卷 985-999页

作者： Ribeiro, Thiago de Luca Sant'ana Costa, Benny Kramer Ferreira, Manuel Portugal Freire, Otávio Bandeira de Lamônica School of Management Instituto Federal de Educação Ciência e Tecnologia de São Paulo São Paulo Brazil School of Management Management Post Graduation Program Universidade Nove de Julho São Paulo Brazil Department of Public Relations Advertising and Tourism School of Communications and Arts of the Universidade de São Paulo São Paulo Brazil Department of Administration and Economics Universidade Federal de Lavras Lavras Brazil Department of Management and Economics School of Management and Technology Polytechnic Institute of Leiria Leiria Portugal School of Arts Sciences and Humanities Tourism Management Post Graduation Program Universidade de São Paulo São Paulo Brazil School of Economics Administration and Accounting Business Administration Post Graduation Program Universidade de São Paulo São Paulo Brazil Tourism Economics and Management Research Center Brazil

In this study we organize and analyze the literature on value co-creation in tourism and hospitality. For this purpose, we conducted a systematic literature review with 298 articles published between 2009 and 2020 indexed in the Web of Science database. We analyzed the methodological and thematic perspectives, as well as the theoretical relationships presented in all studies. We identified four main themes focusing on a) interactions & social networks, b) strategy & innovation, c) sharing economy, and d) value co-creation consequences. Interaction, engagement, and service innovation were the most studied antecedents of value co-creation, and satisfaction, perceived value, and loyalty as the main consequences. Few studies examined value co-creation as a mediating or moderating variable. Finally, we present a conceptual framework including antecedents, consequences, mediation, and moderation (ACMM) involved in value co-creation, to provide a broad understanding of the different perspectives analyzed in this study. © 2023 Elsevier Ltd

关键词： Hospitality research Service-dominant logic Systematic literature review Tourism research Value co-creation

来源：评论

学校读者我要写书评

暂无评论

Study of the neutrino-oxygen cross sections of the charged-current reaction 16O(ν¯e, e+)16N(0 MeV, 2−) and the neutral-current reaction 16O(ν, ν′)16O(12.97/12.53 MeV, 2−), producing high-energy γ rays

arXiv

引用

arXiv 2024年

作者： Sakuda, Makoto Suzuki, Toshio Nakazato, Ken'ichiro Suzuki, Hideyuki Physics Department Okayama University Okayama700-8530 Japan Department of Physics College of Humanities and Sciences Nihon University Tokyo156-8550 Japan NAT Research Center NAT Corporation 3129-45 Hibara Muramatsu Tokai-mura Ibaraki Naka-Gun319-1112 Japan Faculty of Arts and Science Kyushu University Fukuoka819-0395 Japan Department of Physics Faculty of Science and Technology Tokyo University of Science Chiba278-8510 Japan

In the previous work, we discussed the cross section and the detection of 4.4-MeV γ rays produced in the neutrino neutral-current (NC) reaction 16O(ν, ν′)16O(12.97 MeV and 12.53 MeV, 2−) in a water Cherenkov detector at the low energy below 100 MeV. In this report, we further investigated both the charged-current (CC) reaction 16O(ν¯e, e+)16N(0 MeV, 2−) and the NC reaction16O(ν, ν′)16O(12.97 MeV and 12.53 MeV, 2−), producing high-energy γ rays, in which the more solid identification of the reactions can be applied via the coincidence method. © 2024, CC BY.

关键词： Neutrons

来源：评论

学校读者我要写书评

暂无评论

High performance novel flexible perovskite solar cell based on a low-cost-processed ZnO:Co electron transport layer

引用

Nano research 2020年第9期13卷 2546-2555页

作者： Feriel Bouhjar Lotfi Derbali BernabéMari Institut de Disseny i Fabricació(IDF)-Departament de Fisica Aplicada Universitat Politecnica de Valenciciy Cami de Vera s/n46022 ValenciaSpain Photovoltaic Laboratory Research and Technology Centre of Energy(CRTEn)Borj-Cedria Science and Technology Parky BP 952050 Hammam-LifTunisia Laboratory of Semiconductors Nanostructures and Advanced TechnologyResearch and Technology Center of Energy(CRTEn)Borj-Cedria Science and Technology ParkBP 952050 Hammam-LifTunisia Department of Physics College of Sciences and HumanitiesAl QuwayiyahShaqraa UniversityAl QuwayiyahSaudi Arabia

In this work,high quality uniform and dense nanostructured cobalt-doped zinc oxide(ZnO:Co)films were used as electron-transport layers in CH3NH3Pbl3-based planar heterojunction perovskite solar cells(PSCs)on a flexible conductive *** photo catalytically active ZnO:Co films were prepared by a low cost hydrothermal process using the aqueous solution of zinc nitrate hexahydrate,hexamethylenete-tramine and cobalt(II)nitrate ***:Co films were deposited on indium tin oxide(ITO)covered polyethylene terephthalate(PET)flexible *** growth was controlled by maintaining the autoclave temperature at 150℃for 4 *** CH3NH3Pbl3 layer was deposited on the ZnO:Co films by spin ***-OMeTAD was employed as a hole-transporting *** structural,morphology and optical properties of the grown ZnO nanostructures were characterized by X-ray diffraction(XRD),field-emission scanning electron microcopy(FESEM),energy-dispersive X-ray spectrometry(EDX),ultraviolet-visible(UV-Vis)and photoelectrochemical *** spectra showed that both ZnO and ZnO:Co nanorods had a hexagonal wurtzite structure with a strong preferred orientation along the(002)*** surface morphology of films was studied by FESEM and showed that both the pure and Co-doped ZnO films had hexagonal shaped *** the steady state,the ZnO electrode gave a photocurrent density of about 1.5 mA/***,the Co-doped ZnO electrode showed a photocurrent density of about 6 mA/cm^2,which is 4-fold higher than that of the ZnO *** on the above synthesized Co-doped ZnO films,the photovoltaic performance of PSCs was *** Co-doped ZnO layers had a significant impact on the photovoltaic conversion efficiency(PCE)of the *** latter was attributed to an efficient charge separation and transport due to the better coverage of perovskite on the nanostructured Co-doped ZnO *** a result,the measured PCE under standard solar conditions(A M 1.5G,100 mW/cm^2)r

关键词： perovskite solar cell ZnO nanorods hydrotherm al deposition X-ray diffraction(XRD)analysis field-em ission scanning electron m icrocopy(FESEM)analysis photoelectrochem ical properties

来源：评论

学校读者我要写书评

暂无评论

Field-induced electric polarization and elastic softening caused by parity-mixed d−p hybridized states with electric multipoles in Ba2CuGe2O7

引用

Physical Review B 2024年第12期109卷 125129-125129页

作者： R. Kurihara Y. Sato A. Miyake M. Akaki K. Mitsumoto M. Hagiwara H. Kuwahara M. Tokunaga Department of Physics and Astronomy Faculty of Science and Technology Tokyo University of Science Noda Chiba 278-8510 Japan The Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan Institute for Materials Research Tohoku University Sendai Miyagi 980-8577 Japan Liberal Arts and Sciences Toyama Prefectural University Imizu Toyama 939-0398 Japan Center for Advanced High Magnetic Field Science Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan Department of Physics Sophia University Chiyoda Tokyo 102-855 Japan

We performed high-magnetic-field magnetization, polarization, and ultrasonic measurements in Ba2CuGe2O7 to investigate field-induced multiferroic properties arising from a cross-correlation between electric dipoles and electric quadrupoles in addition to cross-correlation between magnetic dipoles and electric dipoles. Magnetization M shows saturation behavior above 20 T for several magnetic field directions, however, electric polarization Pc exhibits an increase, and elastic constants show a softening above 20 T. Based on quantum states with a crystalline electric field for the D2d point group and d−p hybridization between Cu-3d and O-2p electrons, we confirmed that the matrix of an electric dipole Pz was proportional to that of an electric quadrupole Oxy. Furthermore, considering the spin-orbit coupling of 3d electrons and the Zeeman effect, we showed that Pz and Oxy simultaneously exhibited field-induced responses. These findings indicate that the orbital degrees of freedom, in addition to the spin degrees of freedom, contribute to the high-field multiferroicity in Ba2CuGe2O7.

关键词： Elastic modulus Electric polarization High magnetic fields Magnetism Magnetoelastic effect Magnetoelectric effect Strongly correlated systems Magnetization measurements Ultrasound techniques

来源：评论

学校读者我要写书评

暂无评论

Distinguishing a stochastic gravitational-wave signal from correlated noise with joint parameter estimation: Fisher analysis for ground-based detectors

引用

Physical Review D 2023年第6期107卷 064055-064055页

作者： Yoshiaki Himemoto Atsushi Nishizawa Atsushi Taruya Department of Liberal Arts and Basic Sciences College of Industrial Technology Nihon University Narashino Chiba 275-8576 Japan Research Center for the Early Universe (RESCEU) School of Science The University of Tokyo Tokyo 113-0033 Japan Center for Gravitational Physics and Quantum Information Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Kavli Institute for the Physics and Mathematics of the Universe Todai Institutes for Advanced Study The University of Tokyo (Kavli IPMU WPI) Kashiwa Chiba 277-8583 Japan

Search sensitivity to a stochastic gravitational-wave background (SGWB) is enhanced by cross-correlating detector signals. However, one of the most serious concerns is the environmental noise correlated between detectors. The global electromagnetic fields on the Earth, known as Schumann resonances, produce the correlated noise through the instrumental magnetic couplings. In this paper, we study the detectability of a SGWB in the presence of the correlated magnetic noise, using the Fisher analysis based on the analytical model of the correlated magnetic noise. We find that there is no significant degeneracy between the SGWB and noise parameters. Marginalizing over the correlated noise parameters degrades the constraint on each SGWB parameter by a factor of ∼2 at most in the four-detector case, irrespective of the strength of the magnetic coupling. We also confirm that the forecast results are robust against the variation of correlated noise parameters and can vary up to 40% in the realistic range of the coupling parameters for the second-generation detectors. However, ignoring the correlated noise in parameter estimation generally leads to a biased constraint on the SGWB parameters. If the coupling strength is twice as large as expected, this could result in a serious bias.

关键词： Gravitational wave detection Gravitational waves

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：