检索结果-南通市图书馆

Research 2024年第1期2023卷 561-570页

作者： Jie Chen Kangjie Wu Shaokun Gong Jianchao Wang Ke Wang Hengyu Guo College of physics and Electronic Engineering Chongqing Key Laboratory Photo-electric Functional MaterialsChongqing Normal UniversityChongqing 401331China State key laboratory of Mechanical Transmission College of Mechanical and Vehicle EngineeringChongqing UniversityChongqing 400044China School of physics Chongqing UniversityChongqing 400044China

The hybrid electromagnetic-triboelectric generator(HETG)is a prevalent device for mechanical energy ***,the energy utilization efficiency of the electromagnetic generator(EMG)is inferior to that of the triboelectric nanogenerator(TENG)at low driving frequencies,which limits the overall efficacy of the *** tackle this issue,a layered hybrid generator consisting of a rotating disk TENG,a magnetic multiplier,and a coil panel is *** magnetic multiplier not only forms the EMG part with its high-speed rotor and the coil panel but also facilitates the EMG to operate at a higher frequency than the TENG through frequency division *** systematic parameter optimization of the hybrid generator reveals that the energy utilization efficiency of EMG can be elevated to that of rotating disk *** a power management circuit,the HETG assumes the responsibility for monitoring the water quality and fishing conditions by collecting low-frequency mechanical *** magneticmultiplier-enabled hybrid generator demonstrated in this work offers a universal frequency division approach to improve the overall outputs of any hybrid generator that collects rotational energy,expanding its practical applications in diverse multifunctional self-powered systems.

关键词： generator rotating assume

Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2024年第7期67卷 142-150页

作者： Yiming Sun Yubing Tu Yang Luo Shuikang Yu Hongyu Li Yunmei Zhang Ping Wu Zhuying Wang Fan Zhang Wanru Ma Zuowei Liang Jianjun Ying Tao Wu Ziji Xiang Junfeng He Lei Shan Zhenyu Wang Xianhui Chen Department of physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Hefei National LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Information Materials and Intelligent Sensing laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

The superconducting ground state of kagome metals AV_(3)Sb_(5)(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal ***,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap *** implementing Bogoliubov quasiparticle interference(B QPI)imaging,we obtain k-space information on the multiband superconducting gap structureΔ_(SC)^(i)(k)in pristine CsV_(3)Sb_(5).We show that the estimated energy gap on the vanadium d_(xy/x^(2)-y^(2))orbital is anisotropic but nodeless,with a minimal value located near the M ***,a comparison ofΔ_(SC)^(i)(k)with the CDW gapΔ_(CDW)^(i)(k)obtained by angle-re solved photoemission spectro scopy(ARPES)reveals direct k-space competition between the se two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting *** the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb *** information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electro nic orders in this kagome superconductor family.

关键词： kagome lattice charge density wave superconducting energy gap scanning tunneling microscopy

Valleytronic topological filters in silicene-like inner-edge systems

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2024年第1期33卷 66-74页

作者：谢航吕小龙杨加恩 College of physics Chongqing UniversityChongqing 401331China chongqing key laboratory for strongly-coupled physics Chongqing UniversityChongqing 401331China College of Science Guangxi University of Science and TechnologyLiuzhou 545006China School of Electronics and IoT Chongqing College of Electronic EngineeringChongqing 401331China

Inner edge state with spin and valley degrees of freedom is a promising candidate for designing a dissipationless device due to the topological protection. The central challenge for the application of the inner edge state is to generate and modulate the polarized currents. In this work, we discover a new mechanism to generate fully valley-and spin–valley-polarized current caused by the Bloch wavevector mismatch(BWM). Based on this mechanism, we design some serial-typed inner-edge filters. By using once of the BWM, the coincident states could be divided into transmitted and reflected modes, which can serve as a valley or spin–valley filter. In particular, while with twice of the BWM, the incident current is absolutely reflected to support an off state with a specified valley and spin, which is different from the gap *** findings give rise to a new platform for designing valleytronics and spin-valleytronics.

关键词： topological insulator inner-edge state valley polarization spin polarization quantum transport

探索Bi_(2)SeO_(5)的高介电性能:从块体到双层和单层

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第3期67卷 906-913页

作者：董欣月何育彧管乐祝元昊吴金雄付会霞颜丙海 Tianjin key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSmart Sensor Interdisciplinary Science CenterSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China Center of Quantum Materials and Devices College of PhysicsChongqing UniversityChongqing 401331China chongqing key laboratory for strongly coupled physics Chongqing UniversityChongqing 401331China Department of Condensed Matter physics Weizmann Institute of ScienceRehovot 7610001Israel

Bi_(2)SeO_(5)是一种具有优异电绝缘性能的范德华(vdW)层状介电材料,引起了极大关注.然而,目前关于Bi_(2)SeO_(5)的研究主要停留在实验层面,仍然缺乏对其原子级薄膜的介电性能的相关理论认识.本文通过第一性原理计算确定了Bi_(2)SeO_(5... 详细信息

Bi_(2)SeO_(5)是一种具有优异电绝缘性能的范德华(vdW)层状介电材料,引起了极大关注.然而,目前关于Bi_(2)SeO_(5)的研究主要停留在实验层面,仍然缺乏对其原子级薄膜的介电性能的相关理论认识.本文通过第一性原理计算确定了Bi_(2)SeO_(5)的介电性能,发现其块体、双层和单层均具有超高平均介电常数(εr>20).研究表明,单层Bi_(2)SeO_(5)与双层Bi_(2)O_(2)Se之间的导带和价带能量偏移量均大于1 eV,表明单层Bi_(2)SeO_(5)依然可作为原子薄Bi_(2)O_(2)Se的良好介电层.此外,不同于h-BN或其他2D vdW绝缘体,Bi_(2)SeO_(5)的εr由其离子部分主导,且随着厚度的减小几乎保持不变.计算发现,单层Bi_(2)SeO_(5)的等效氧化层厚度可薄至0.3 n m,且单层Bi_(2)SeO_(5)在拉伸或压缩应变达到6%时均能保持高介电常数,这极大地促进了它与各种二维半导体的集成.本工作证明单层Bi_(2)SeO_(5)可以作为高性能二维电子器件良好的封装和介电层.

关键词： Bi_(2)SeO_(5) high-κ equivalent oxide thickness dielectric constant van der Waals first-principles calculations

Production of higher excited quarkonium pair at the super Z factory

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第7期48卷 45-54页

作者：廖其力蒋军 chongqing College of Mobile Telecommunications Chongqing 401520China chongqing key laboratory of Public Big Data Security Technology Chongqing 401520China School of physics Shandong UniversityJinan 250100China

The heavy constituent quark pair of the heavy quarkonium is produced perturbatively and subsequently undergoes hadronization into the bound state *** production of the heavy quarkonium is essential to testing our understanding of quantum chromodynamics(QCD)in both perturbative and non-perturbative *** electron-positron collider will provide a suitable platform for the precise study of the heavy *** higher excited heavy quarkonium may contribute significantly to the ground states,which should be considered for sound *** study the production rates of the higher excited states quarkonium pair in■at the future Z factory under the non-relativistic QCD(NRQCD)framework,where the■represents the color-singlet states■The differential angle distribution of cross sections■is *** also discuss the uncertainties of cross sections caused by the varying quark masses and the renormalization scaleμ.We show that significant numbers of events for pairs of higher excited state quarkonia can be generated at the super Z factory.

关键词： Z boson decays pair of higher excited quarkonia NRQCD D0I:10.1088/1674-1137/ad3c2e

Exploring reservoir computing:Implementation via double stochastic nanowire networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2024年第3期33卷 572-582页

作者：唐健峰夏磊李广隶付军段书凯王丽丹 College of Artificial Intelligence Southwest UniversityChongqing 400715China Brain-inspired Computing & Intelligent Control of chongqing key laboratory Chongqing 400715China National & Local Joint Engineering laboratory of Intelligent Transmission and Control Technology Chongqing 400715China chongqing Brain Science Collaborative Innovation Center Chongqing 400715China key laboratory of Luminescence Analysis and Molecular Sensing Ministry of EducationSouthwest UniversityChongqing 400715China State key laboratory of Intelligent Vehicle Safety Technology Chongqing 400715China

Neuromorphic computing,inspired by the human brain,uses memristor devices for complex *** studies show that self-organizing random nanowires can implement neuromorphic information processing,enabling data *** paper presents a model based on these nanowire networks,with an improved conductance variation *** suggest using these networks for temporal information processing via a reservoir computing scheme and propose an efficient data encoding method using voltage *** nanowire network layer generates dynamic behaviors for pulse voltages,allowing time series prediction *** experiment uses a double stochastic nanowire network architecture for processing multiple input signals,outperforming traditional reservoir computing in terms of fewer nodes,enriched dynamics and improved prediction *** results confirm the high accuracy of this architecture on multiple real-time series datasets,making neuromorphic nanowire networks promising for physical implementation of reservoir computing.

关键词： double-layer stochastic(DS)nanowire network architecture neuromorphic computation nanowire network reservoir computing time series prediction

Estimation of cancer cell migration in biomimetic random/oriented collagen fiber microenvironments

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2024年第5期33卷 749-756页

作者：姚静如李国强姚喜耀周连杰叶志凯刘艳平郑栋天唐婷宋克纳陈果刘雳宇 chongqing key laboratory of Soft Condensed Matter physics and Smart Materials College of PhysicsChongqing UniversityChongqing 401331China chongqing key laboratory for Resource Utilization of Heavy Metal Wastewater Aquatic Ecosystems in the Three Gorges Reservoir Region of Chongqing Observation and Research StationChongqing University of Arts and SciencesYongchuan 402160China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325000China Department of Biomedical Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China College of Medical Technology and Engineering Henan University of Science and TechnologyHenan 471023China

Increasing data indicate that cancer cell migration is regulated by extracellular matrixes and their surrounding biochemical microenvironment,playing a crucial role in pathological processes such as tumor invasion and ***,conventional two-dimensional cell culture and animal models have limitations in studying the influence of tumor microenvironment on cancer cell ***,the further development of microfluidic technology has provided solutions for the study of such *** utilize microfluidic chip to build a random collagen fiber microenvironment(RFM)model and an oriented collagen fiber microenvironment(OFM)model that resemble early stage and late stage breast cancer microenvironments,*** combining cell culture,biochemical concentration gradient construction,and microscopic imaging techniques,we investigate the impact of different collagen fiber biochemical microenvironments on the migration of breast cancer MDA-MB-231-RFP *** results show that MDA-MB-231-RFP cells migrate further in the OFM model compared to the RFM model,with significant differences ***,we establish concentration gradients of the anticancer drug paclitaxel in both the RFM and OFM models and find that paclitaxel significantly inhibits the migration of MDA-MB-231-RFP cells in the RFM model,with stronger inhibition on the high concentration side compared to the low concentration ***,the inhibitory effect of paclitaxel on the migration of MDA-MB-231-RFP cells in the OFM model is *** findings suggest that the oriented collagen fiber microenvironment resembling the late-stage tumor microenvironment is more favorable for cancer cell migration and that the effectiveness of anticancer drugs is *** RFM and OFM models constructed in this study not only provide a platform for studying the mechanism of cancer development,but also serve as a tool for the initial measurement of drug screening.

关键词： microfluidic chip random collagen fiber microenvironment(RFM) oriented collagen fiber microenvironment(OFM) cancer cell migration

Crystallinity-defect matching relationship of g-C_(3)N_(4): Experimental and theoretical perspectives

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第4期9卷 623-658页

作者： Yuhan Li Ziteng Ren Zhengjiang He Ping Ouyang Youyu Duan Wendong Zhang Kangle Lv Fan Dong Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing400067China Nanchang Institute of Technology Nanchang33044China key laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission College of Resources and Environmental ScienceSouth-Central Minzu UniversityWuhan430074China College of physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing401331China chongqing key laboratory of Green Synthesis and Application Chongqing Normal UniversityChongqing401331China

Good crystallinity can reduce the charge recombination centers caused by defects,whilst structures with strong polycondensation have high charge mobility,leading to more charge transfer to the material surface for *** effort has been put into the preparation of a highly efficient g-C_(3)N_(4) with defects to improve its application potential under the premise in high ***,this review paper emphasizes the importance to balance the defect and crystallinity of g-C_(3)N_(4).In addition,detailed discussion on the relationship between defects and activity of g-C_(3)N_(4) was carried out based on its applications in environmental purification(e.g.,VOCs oxidation,NO_(x) oxidation,H_(2)O_(2) evolution,sterilization,pesticide oxidation)and energy conversion(H_(2) evolution,N_(2) fixation and CO_(2) reduction).Lastly,the challenge in developing more efficient defective g-C_(3)N_(4) photocatalytic materials is summarized.

关键词： Photocatalysis Defect G-C_(3)N_(4) Crystallinity Application

在线全文

学校读者我要写书评

暂无评论

核物质中张量力效应的相对论第一性原理研究

Science Bulletin 2024年第14期69卷 2166-2169页

作者：王锶博童辉王宸璨赵强 Peter Ring 孟杰 Department of physics and chongqing key laboratory for strongly coupled physics Chongqing UniversityChongqing 401331China Helmholtz Institute for Radiation and Nuclear physics University of BonnBonn D-53115Germany School of physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China Center for Exotic Nuclear Studies Institute for Basic ScienceDaejeon 34126South Korea Department of physics Technical University of MunichGarching D-85747Germany State key laboratory of Nuclear physics and Technology School of PhysicsPeking UniversityBeijing 100871China

As a crucial ingredient of the nucleon-nucleon(NN)interaction,the tensor force has an important impact on the structural and dynamical properties of the nuclear many-body system,particularly the properties of exotic nuclei far away from the stability,which are crucial for understanding the nucleosynthesis in nuclear *** efforts have been devoted to studying the influence of the tensor force in the effective NN interaction in the nuclear medium within the configuration interaction shell model[1]and the density functional theories(DFTs)[2].Due to the difference of modeling the effective NN interaction and the difficulty of determining the tensor-force strengths in finite nuclei,the tensorforce effects in nuclear physics still need to be fully settled.

关键词：张量力核物质 tensor

Non-perturbative dynamics of flat-band systems with correlated disorder

在线全文

学校读者我要写书评

暂无评论

CHINESE physics B 2024年第9期33卷 547-551页

作者： Li, Qi Liu, Junfeng Liu, Ke Hu, Zi-Xiang Li, Zhou Chinese Acad Sci Aerosp Informat Res Inst GBA Branch Guangzhou 510535 Peoples R China Guangdong Prov key Lab Terahertz Quantum Electrom Guangzhou 510700 Peoples R China Univ Chinese Acad Sci Beijing 100039 Peoples R China Guangzhou Univ Sch Phys & Mat Sci Guangzhou 510006 Peoples R China chongqing Univ Dept Phys Chongqing 401331 Peoples R China chongqing Univ Chongqing Key Lab Strongly Coupled Phys Chongqing 401331 Peoples R China

We develop a numerical method for the time evolution of Gaussian wave packets on flat-band lattices in the presence of correlated disorder. To achieve this, we introduce a method to generate random on-site energies with prescribed correlations. We verify this method with a one-dimensional (1D) cross-stitch model, and find good agreement with analytical results obtained from the disorder-dressed evolution equations. This allows us to reproduce previous findings, that disorder can mobilize 1D flat-band states which would otherwise remain localized. As explained by the corresponding disorder-dressed evolution equations, such mobilization requires an asymmetric disorder-induced coupling to dispersive bands, a condition that is generically not fulfilled when the flat-band is resonant with the dispersive bands at a Dirac point-like crossing. We exemplify this with the 1D Lieb lattice. While analytical expressions are not available for the two-dimensional (2D) system due to its complexity, we extend the numerical method to the 2D alpha-T3 model, and find that the initial flat-band wave packet preserves its localization when alpha = 0, regardless of disorder and intersections. However, when alpha not equal 0, the wave packet shifts in real space. We interpret this as a Berry phase controlled, disorder-induced wave-packet mobilization. In addition, we present density functional theory calculations of candidate materials, specifically Hg1-xCdxTe. The flat-band emerges near the Gamma point (k = 0) in the Brillouin zone.

关键词： flat-band system dynamics correlated disorder 72.80.Ng 78.20.Bh 67.80.de 05.50.+q HUBBARD-MODEL FERROMAGNETISM LOCALIZATION INSULATOR