检索结果-内蒙古大学图书馆

Observation of dark edge states in parity-time-symmetric quantum dynamics

National science Review 2023年第8期10卷 156-165页

作者： Peng Xue Xingze Qiu Kunkun Wang Barry C. Sanders Wei Yi Beijing Computational Science Research Center Key Laboratory of Quantum Information University of Science and Technology of China Chinese Academy of Sciences Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Chinese Academy of Sciences School of Physics and Optoelectronic Engineering Anhui University Shanghai Branch National Laboratory for Physical Sciences at MicroscaleUniversity of Science and Technology of China Institute for Quantum Science and Technology University of Calgary Program in Quantum Information Science Canadian Institute for Advanced Research

Topological edge states arise in non-Hermitian parity-time(PT)-symmetric systems, and manifest themselves as bright or dark edge states, depending on the imaginary components of their eigenenergies. As the spatial probabilities of dark edge states are suppressed during the non-unitary dynamics, it is a challenge to observe them experimentally. Here we report the experimental detection of dark edge states in photonic quantum walks with spontaneously broken PT symmetry, thus providing a complete description of the topological phenomena therein. We experimentally confirm that the global Berry phase in PT-symmetric quantum-walk dynamics unambiguously defines topological invariants of the system in both the PT-symmetry-unbroken and-broken regimes. Our results establish a unified framework for characterizing topology in PT-symmetric quantum-walk dynamics, and provide a useful method to observe topological phenomena in PT-symmetric non-Hermitian systems in general.

关键词： parity-time symmetry photonic quantum walks dark edge states topological invariants

来源：评论

学校读者我要写书评

暂无评论

Enhancing the Electrochemical Activity of 2D Materials Edges through Oriented Electric Fields

引用

ACS Nano 2024年第30期18卷 19828-19835页

作者： Wang, Hao Chen, Ding-Rui Lin, You-Chen Lin, Po-Han Chang, Jui-Teng Muthu, Jeyavelan Hofmann, Mario Hsieh, Ya-Ping Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei10617 Taiwan Department of Low Dimensional Systems J. Heyrovský Institute of Physical Chemistry Prague18200 Czech Republic

The edges of 2D materials have emerged as promising electrochemical catalyst systems, yet their performance still lags behind that of noble metals. Here, we demonstrate the potential of oriented electric fields (OEFs) to enhance the electrochemical activity of 2D materials edges. By atomically engineering the edge of a fluorographene/graphene/MoS2 heterojunction nanoribbon, strong and localized OEFs were realized as confirmed by simulations and spatially resolved spectroscopy. The observed fringing OEF results in an enhancement of the heterogeneous charge transfer rate between the edge and the electrolyte by 2 orders of magnitude according to impedance spectroscopy. Ab initio calculations indicate a field-induced decrease in the reactant adsorption energy as the origin of this improvement. We apply the OEF-enhanced edge reactivity to hydrogen evolution reactions (HER) and observe a significantly enhanced electrochemical performance, as evidenced by a 30% decrease in Tafel slope and a 3-fold enhanced turnover frequency. Our findings demonstrate the potential of OEFs for tailoring the catalytic properties of 2D material edges toward future complex reactions. © 2024 The Authors. Published by American Chemical Society.

关键词： Electric fields

来源：评论

学校读者我要写书评

暂无评论

Multi-Panel Extra-Large Scale MIMO Based Joint Activity Detection and Channel Estimation for Near-Field Massive IoT Access

引用

China Communications 2023年第5期20卷 232-243页

作者： Zhen Gao Hanlin Xiu Yikun Mei Anwen Liao Malong Ke Chun Hu Mohamed-Slim Alouini School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China MIIT Key Laboratory of Complex-Field Intelligent Sensing Beijing Institute of TechnologyBeijing 100081China The Advanced Technology Research Institute of Beijing Institute of Technology Jinan 250307China Yangtze Delta Region Academy of Beijing Institute of Technology(Jiaxing) Jiaxing 314019China Electrical Engineering Program Division of Physical Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwal 23955Saudi Arabia

The extra-large scale multiple-input multiple-output(XL-MIMO)for the beyond fifth/sixth generation mobile communications is a promising technology to provide Tbps data transmission and stable access ***,the extremely large antenna array aperture arouses the channel near-field effect,resulting in the deteriorated data rate and other challenges in the practice communication ***,multi-panel MIMO technology has attracted extensive attention due to its flexible configuration,low hardware cost,and wider *** combining the XL-MIMO and multi-panel array structure,we construct multi-panel XL-MIMO and apply it to massive Internet of Things(IoT)***,we model the multi-panel XL-MIMO-based near-field channels for massive IoT access scenarios,where the electromagnetic waves corresponding to different panels have different angles of arrival/departure(AoAs/AoDs).Then,by exploiting the sparsity of the near-field massive IoT access channels,we formulate a compressed sensing based joint active user detection(AUD)and channel estimation(CE)problem which is solved by AMP-EM-MMV *** simulation results exhibit the superiority of the AMP-EM-MMV based joint AUD and CE scheme over the baseline algorithms.

关键词： extra-large scale MIMO massive IoT access active user detection channel estimation multipanel approximate message passing

来源：评论

学校读者我要写书评

暂无评论

Photocatalytic bio-inspired PDA-RGO/g-C3N4 nanocomposite incorporated PES membrane for removal of environmental antibiotic pollutants

引用

Journal of Chemical technology and Biotechnology 2024年第6期99卷 1401-1413页

作者： Govardhanan, B. GokulaKrishnan, S.A. Arthanareeswaran, G. Ashok, M. Chen, Yong-Song Taweepreda, W. Membrane Research Laboratory Department of Chemical Engineering National Institute of Technology Tiruchirappalli Tiruchirappalli India New Generation Materials lab Department of Physics National Institute of Technology Tiruchirappalli Tiruchirappalli India Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations National Chung Cheng University Chiayi County Taiwan Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Thailand

BACKGROUND: Membrane technology makes it more suitable for the treatment of environmental polluted organic wastewater. Membrane fouling is one of the major concerns in commercial membranes. To overcome this issue, photocatalytic nanomaterials are embedded into the membrane to enhance its surface nature and reusability. In this investigation, polydopamine functionalized graphene oxide (PDA-RGO), graphite carbon nitride (g-C3N4) and PDA-RGO/g-C3N4 nanomaterials were incorporated within polyethersulfone membrane fabricated via a phase inversion technique. These as-prepared membranes’ functional groups and surface morphologies were investigated by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and field emission electron microscopy (FESEM). These as-prepared membranes were investigated for photocatalytic activity under visible-light-driven photodegradation by environmental pollutants such as Rhodamine B (RhB) and Norfloxacin (NOR). RESULTS: Compared with pristine PES membrane, the PDA-RGO/g-C3N4-PES nanocomposite membrane showed higher photocatalytic activity for Rhodamine B 94.6% and Norfloxacin 96.8%, also reached greater water flux 189 L m−2 h−1. Therefore, the bio-inspired nanocomposite-modified PDA-RGO/g-C3N4 photocatalytic membrane could have huge potential in processing environmentally polluted water. CONCLUSIONS: PDA-RGO/g-C3N4-PES nanocomposite membrane improved the membrane hydrophilicity, water flow, anti-fouling performance, rejection studies and photocatalytic degradation than the pristine membrane. The synergistic result of PDA-RGO and g-C3N4 exhibits better photodegradation efficiency of the membrane towards environmental pollutants. © 2024 Society of Chemical Industry (SCI). © 2024 Society of Chemical Industry (SCI).

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Data Analytics and Visualization in Bimanual Rehabilitation Monitoring Systems: A User-Centered Design Approach to Healthcare Professionals Decision Support

Data Analytics and Visualization in Bimanual Rehabilitation ...

引用

2024 International Conference on Electrical Engineering and Informatics, ICELTICs 2024

作者： Wisedsri, Parkpoom Anutariya, Chutiporn Sujarae, Aekavute Vachalathiti, Roongtiwa Bovonsunthonchai, Sunee School of Engineering and Technology Asian Institute of Technology Computer Science Program Pathum Thani Thailand Punsarn Asia Co. Ltd Thailand Mahidol University Faculty of Physical Therapy Nakhon Pathom Thailand

ISBN: (纸本)9798350366822

This study presents the design of a user-centered data visualization dashboard for stroke rehabilitation, which integrates the principles of visualization data analytics techniques in the field of healthcare. Addressing the complexities of visualizing for robotic bimanual rehabilitation, the design introduces novel methods to enhance data visualization, broadening monitoring capabilities, and improving the clarity of torque data. These enhancements lead to a clearer understanding of patient robot interactions. A prototype has been developed to visualize transparent torque data from a bimanual master slave robotic system, enabling healthcare professionals to monitor patient progress effectively. The dashboard features intuitive visual representations of master, slave, and assistive torques, simulating elbow joint movements through line and sunburst charts. Feedback from rehabilitation therapists during the design process ensures that the visualization approach is aligned with clinical needs. The findings suggest that the system can assist physiotherapists in devising personalized treatment strategies by providing actionable insights from the recorded data. However, additional research is needed to integrate real clinical data into the system for further enhancement and validation. This innovation has the potential to significantly improve stroke rehabilitation effectiveness and patient outcomes through a bimanual rehabilitation visualization and decision support system. © 2024 IEEE.

关键词： Clinical research

来源：评论

学校读者我要写书评

暂无评论

Membrane tension evolution and mechanical regulation of melittin-induced membrane poration

引用

Chinese Physics B 2024年第10期33卷 465-475页

作者： Wanting Zhang Rong Xu Wendong Ma Zhao Lin Kai Yang Bing Yuan Center for Soft Condensed Matter Physics and Interdisciplinary Research&School of Physical Science and Technology Soochow UniversitySuzhou 215006China Songshan Lake Materials Laboratory Dongguan 523808China Biomedicine Discovery Institute Infection&Immunity ProgramMonash UniversityMelbourneAustralia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Membrane tension plays a crucial role in various fundamental cellular processes,with one notable example being the T cell-mediated elimination of tumor cells through perforin-induced membrane perforation by amplifying cellular ***,the mechanisms governing the regulation of biomolecular activities at the cell interface by membrane tension remain *** this study,we investigated the correlation between membrane tension and poration activity of melittin,a prototypical pore-forming peptide,using dynamic giant unilamellar vesicle leakage assays combined with flickering tension analysis,molecular dynamics simulations,and live cell *** results demonstrate that an increase in membrane tension enhances the activity of melittin,particularly near its critical pore-forming ***,peptide actions such as binding,insertion,and aggregation in the membrane further influence the evolution of membrane *** cell experiments reveal that artificially enhancing membrane tension effectively enhances melittin’s ability to induce pore formation and disrupt membranes,resulting in up to a ten-fold increase in A549 cell mortality when exposed to a concentration of 2.0-μg·mL^(-1)*** findings elucidate the relationship between membrane tension and the mechanism of action as well as pore-forming efficiency of melittin,while providing a practical mechanical approach for regulating functional activity of molecules at the cell-membrane interface.

关键词： membrane tension mechanical regulation membrane poration giant unilamellar vesicle leakage assay

来源：评论

学校读者我要写书评

暂无评论

Effect of non-Markovianity on synchronization

引用

Communications in Theoretical Physics 2021年第10期73卷 81-89页

作者： Kun-Jie Zhou Jian Zou Bao-Ming Xu Lei Li Bin Shao School of Physics Beijing Institute of TechnologyBeijing 100081China Shandong Key Laboratory of Biophysics Institute of BiophysicsDezhou UniversityDezhou 253023China School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China

We investigate the transient spontaneous quantum synchronization between two qubits interacting with a common non-Markovian environment based on a collision *** are mainly interested in the effect of non-Markovianity on the synchronization between two *** find that the non-Markovianity always delay the anti-synchronization and decrease the parameter region where the qubits get ***,we define V to characterize the visibility of synchronization and show that there is an apparent link among V,entanglement and quantum mutual information whether in the Markovian or non-Markovian regimes when the environment is in the vacuum ***,with the increase of temperature,the parameter region of the emergence of anti-synchronization and the time to get anti-synchronized in the non-Markovian regime gradually approaches that in the Markovian *** high temperature decreases the parameter region of the emergence of anti-synchronization in both Markovian and non-Markovian regimes,and breaks the connection among V,entanglement and quantum mutual information.

关键词： quantum synchronization non-Markovianity entanglement quantum mutual information

来源：评论

学校读者我要写书评

暂无评论

Unassisted photoelectrochemical CO_(2)reduction by employingⅢ-Ⅴphotoelectrode with 15%solar-to-fuel efficiency

引用

Carbon Energy 2025年第3期7卷 1-10页

作者： Karthik Peramaiah Purushothaman Varadhan Vinoth Ramalingam Bilawal Khan Pradip Kumar Das Hao Huang Hui-Chun Fu Xiulin Yang Vincent Tung Kuo-Wei Huang Jr-Hau He Chemistry Program Center for Renewable Energy and Storage Technologies(CREST)and Division of Physical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Institute of Sustainability for Chemicals Energyand Environment(ISCE2)Agency for ScienceTechnologyand Research(A*STAR)Singapore School of Computing Engineering and TechnologyRobert Gordon UniversityAberdeenUK Department of Materials Science and Engineering City University of Hong KongKowloonSARHong KongChina Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilinChina Department of Chemical System and Engineering University of TokyoTokyoJapan

Solar-driven carbon dioxide reduction reaction(CO_(2)RR)provides an oppor tunity to produce value-added chemical feedstocks and ***,achieving efficient and stable photoelectrochemical(PEC)CO_(2)RR into selec tive products is challenging owing to the difficulties associated with the optical and the electrical configuration of PEC devices and electrocatalyst ***,we construct an efficient,concentrated sunlight-driven CO_(2)RR setup consisting of InGaP/GaAs/Ge triple-junction cell as a photoanode and oxide-derived Au(Ox-Au)as a cathode to perform the unassisted PEC CO_(2)*** one-sun illumination,a maximum operating current density of 11.5 mA cm^(-2) with an impressive Faradaic efficiency(FE)of~98%is achieved for carbon monoxide(CO)production,leading to a solar-to-fuel conversion efficiency of~15%.Under concentrated intensity of 10 sun,the photoanode records a maximum current density of~124 mAcm^(-2) and maintains~60%of FE for CO *** results demonstrate crucial advancements in usingⅢ-Ⅴbased photoanodes for concentrated PEC CO_(2)RR.

关键词： 3J photoanode CO_(2)reduction high STF unassisted PEC

来源：评论

学校读者我要写书评

暂无评论

Quadruple-band synglisis enables high thermoelectric efficiency in earth-abundant tin sulfide crystals

引用

science (New York, N.Y.) 2025年第6730期387卷 202-208页

作者： Liu, Shan Bai, Shulin Wen, Yi Lou, Jing Jiang, Yongzhen Zhu, Yingcai Liu, Dongrui Li, Yichen Shi, Haonan Liu, Shibo Wang, Lei Zheng, Junqing Zhao, Zhe Qin, Yongxin Liu, ZhongKai Gao, Xiang Qin, Bingchao Chang, Cheng Chang, Chao Zhao, Li-Dong Center for Bioinspired Science and Technology Beihang University Hangzhou China School of Materials Science and Engineering Beihang University Beijing China Tianmushan Laboratory Hangzhou China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense Technology Beijing China School of Physical Science and Technology ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai China Beihang University Beijing China Center for High Pressure Science and Technology Advanced Research (HPSTAR) Beijing China School of Physics Peking University Beijing China

Thermoelectrics have been limited by the scarcity of their constituent elements, especially telluride. The earth-abundant, wide-bandgap (Eg ≈ 46 kBT) tin sulfide (SnS) has shown promising performance in its crystal form. We improved the thermoelectric efficiency in SnS crystals by promoting the convergence of energy and momentum of four valance bands, termed quadruple-band synglisis. We introduced more Sn vacancies to activate quadruple-band synglisis and facilitate carrier transport by inducing SnS2 in selenium (Se)-alloyed SnS, leading to a high dimensionless figure of merit (ZT) of ~1.0 at 300 kelvin and an average ZT of ~1.3 at 300 to 773 kelvin in p-type SnS crystals. We further obtained an experimental efficiency of ~6.5%, and our fabricated cooler demonstrated a maximum cooling temperature difference of ~48.4 kelvin at 353 kelvin. Our observations should draw interest to earth-abundant SnS crystals for applications of waste-heat recovery and thermoelectric cooling.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Exponentially Tilted Thermodynamic Maps (expTM): Predicting Phase Transitions Across Temperature, Pressure, and Chemical Potential

arXiv

引用

arXiv 2025年

作者： Lee, Suemin Wang, Ruiyu Herron, Lukas Tiwary, Pratyush Biophysics Program Institute for Physical Science and Technology University of Maryland College Park20742 United States University of Maryland Institute for Health Computing BethesdaMD20852 United States Institute for Physical Science and Technology University of Maryland College Park20742 United States Department of Chemistry and Biochemistry Institute for Physical Science and Technology University of Maryland College Park20742 United States

Predicting and characterizing phase transitions is crucial for understanding generic physical phenomena such as crystallization, protein folding and others. However, directly observing phase transitions is not always easy, and often one has limited observations far from the phase boundary and measured under some specific thermodynamic conditions. In this study, we propose a statistical physics and Generative AI driven framework that can take such limited information to generate samples of different phases under arbitrary thermodynamic conditions, which we name Exponentially Tilted Thermodynamic Maps (expTM). The central idea is to map collected data into a tractable simple prior expressed as an exponentially tilted Gaussian. We demonstrate how the variance and mean of the prior can be correlated with pairs of thermodynamic control variables, including temperature, pressure, and chemical potential. This gives us the ability to generate thermodynamically correct samples under any values of the control variables. To demonstrate the practical applicability of this approach, we use expTM to sample the lattice gas models with the Grand Canonical ensemble, capturing phase transitions under varying chemical potentials and temperatures. We further demonstrate how expTM can model the isothermal-isobaric ensemble, with which we predict different phases of CO2 under varying pressure conditions. Both examples are trained on very limited data far from the phase boundary. These results establish expTM as a robust tool for understanding phase transitions across diverse thermodynamic conditions requiring only a small number of observations. © 2025, CC BY.

关键词： Chemical potential

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：