检索结果-内蒙古大学图书馆

Voltage-Controlled Synthesis of Higher Harmonics in Hybrid Josephson Junction Circuits

Physical Review Letters 2024年第18期133卷 186303页

作者： L. Banszerus W. Marshall C. W. Andersson T. Lindemann M. J. Manfra C. M. Marcus S. Vaitiekėnas Center for Quantum Devices Niels Bohr Institute Department of Physics Department of Physics and Astronomy Birck Nanotechnology Center School of Electrical and Computer Engineering School of Materials Engineering Materials Science and Engineering

We report measurements of the current-phase relation of two voltage-controlled semiconductor-superconductor hybrid Josephson junctions (JJs) in series. The two hybrid junctions behave similar to a single-mode JJ with effective transparency determined by the ratio of Josephson coupling strengths of the two junctions. Gate-voltage control of Josephson coupling (measured from switching currents) allows tuning of the harmonic content from sinusoidal, for asymmetric tuning, to highly nonsinusoidal, for symmetric tuning. The experimentally observed tunable harmonic content agrees with a model based on two conventional (sinusoidal) JJs in series.

关键词： Critical current Josephson effect Josephson junctions Semiconductors Superconducting devices Superconductors Resistivity measurements

来源：评论

学校读者我要写书评

暂无评论

Mathematical modelling and critical assessment of analytical solutions of forced-damped vibrations of the cardiovascular-implant system

引用

Journal of Medical engineering and Technology 2025年 1-8页

作者： Das, Kuntal Kumar Srivastava, Yogendra Basu, Bikramjit Dubey, Ashutosh Kumar Department of Ceramic Engineering Indian Institute of Technology (BHU) Varanasi India Department of Physics Northeastern University Boston MA United States Materials Research Center Indian Institute of Science Bengaluru India

A recent innovation in bioelectronic medicine is the use of implantable devices capable of harvesting biomechanical energy from cardiac motion. Such self-powered devices would facilitate cardiovascular functionality in patients with compromised hearts. This not only requires integrating bioelectronic medicine with cardiovascular physiology, but also a quantitative predictability of their functioning. We present a first attempt to establish a quantitative basis derived through biophysical considerations. Assuming cardiac functionality to be described using a spring-dashpot model, we present analytical solutions for different scenarios of physiological relevance. A key result is that the inverse lifetime lower than the natural frequency of the heart vibration leads to a rapid decrease in vibrational amplitudes of the implant as the cardiac cycle moves to the relaxation phase. When the inverse lifetime equals the natural frequency, vibrations persist to the largest extent and a substantial amount of energy can be harvested in a cardiac cycle via energy harvesting mechanisms (piezoelectric and triboelectric). Our analysis points to the critical role of the implant mass on variations in displacement during heart vibrations. Our theoretical predictions provide guidelines for developing next-generation biomedical devices with the heart as the in vivo source of energy harvesting. © 2025 Informa UK Limited, trading as Taylor & Francis Group.

关键词： cardiac cycle damping Energy harvesting inverse lifetime resonance vibration

来源：评论

学校读者我要写书评

暂无评论

The effect of calcium and barium fluoride on CeF3 doped in gadolinium phosphate scintillating glass

引用

Ceramics International 2025年第16期51卷 22955-22966页

作者： Sarumaha, C.S. Kantuptim, P. Yanagida, T. Intachai, N. Kothan, S. Kim, H.J. Busayaporn, W. Pakawanit, P. Phoovasawat, C. Kaewnuam, E. Kaewkhao, J. Faculty of Science and Technology Muban Chombueng Rajabhat University Ratchaburi 70150 Thailand Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand Department of Materials Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand Division of Materials Science of Science and Technology Nara Institute of Science and Technology 8916-5 Takayama Ikoma Nara630-0192 Japan Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai50200 Thailand Department of Physics Kyungpook National University Daegu41566 Korea Republic of Synchrotron Research and Applications Division Synchrotron Light Research Institute 111 University Avenue Muang District Nakhon Ratchasima30000 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand

This study concerns alkaline fluorides such as CaF2 and BaF2 contained in gadolinium phosphate glass doped with CeF3, which were synthesized using a melt-quenching technique. Ce3+ was activated in both glasses and a comparative study of their optical, luminescence and scintillation behaviors was conducted. The results found that the higher atomic weight of BaF2 glass makes higher density compared with CaF2 glass, resulting in more integral scintillation efficiency. The quantum yield of BaF2-glass (PLZGdBafCe0.5) is also higher than that of CaF2-glass (PLZGdCafCe0.5). Energy transfer efficiency from Gd3+ to Ce3+ shows similar values, reflecting that the higher photoluminescence intensity of BaF2-glass comes from the efficiency of the luminescence center (Ce3+ ion). Photoluminescence and scintillation decay times were measured and found to be in the range of nanoseconds. XANES measurement was used to confirm the oxidation state and ratio between Ce3+/Ce4+. Moreover, the practical application of the glass scintillator was succeeded by micro-imaging using synchrotron X-ray. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Photoluminescence

来源：评论

学校读者我要写书评

暂无评论

In-situ nonvolatile and volatile modulation for optical neural networks

引用

Advanced Photonics 2023年第5期5卷 1-2页

作者： Carlos A.Ríos Ocampo University of Maryland Department of Materials Science&EngineeringCollege ParkMarylandUnited States University of Maryland Institute for Research in Electronics and Applied PhysicsCollege ParkMarylandUnited States

High-performance integrated optical memristors are crucial in developing optical neural networks based on in-memory *** devices are building blocks capable of modulating the transmission of a propagating mode in a multilevel and nonvolatile fashion,thus allowing storage and multiplication of analog signals in the same device.1 Chalcogenide phase change materials(PCMs)are candidates for high-performance devices.

关键词： optical networks neural

来源：评论

学校读者我要写书评

暂无评论

Unraveling the electrophilic oxygen-mediated mechanism for alcohol electrooxidation on NiO

引用

National science Review 2023年第5期10卷 251-261页

作者： Wei Chen Jianqiao Shi Chao Xie Wang Zhou Leitao Xu Yingying Li Yandong Wu Binbin Wu Yu-Cheng Huang Bo Zhou Ming Yang Jilei Liu Chung-Li Dong Tehua Wang Yuqin Zou Shuangyin Wang State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringAdvanced Catalytic Engineering Research Center of the Ministry of EducationHunan University College of Chemistry and Chemical Engineering Hunan Normal University College of Materials Science and Engineering Hunan University Research Center for X-ray Science&Department of Physics Tamkang University Shenzhen Institute of Hunan University

Aqueous organic electrosynthesis such as nucleophile oxidation reaction（NOR） is an economical and green ***,its development has been hindered by the inadequate understanding of the synergy between the electrochemical and non-electrochemical *** this study,we unravel the NOR me chanism for the primary alcohol/vicinal diol electro oxidation on ***,the ele ctrochemical step is the generation of Ni3+-（OH）ads,and the spontaneous reaction between Ni3+-（OH）adsand nucle ophiles is an electrocatalyst-induced non-electrochemical *** identify that two electrophilic oxygen-mediated mechanisms（EOMs）,EOM involving hydrogen atom transfer（HAT） and EOM involving C-C bond cleavage,play pivotal roles in the electro oxidation of primary alcohol to carboxylic acid and the electrooxidation of vicinal diol to carboxylic acid and formic acid,*** on these findings,we establish a unified NOR mechanism for alcohol electrooxidation and deepen the understanding of the synergy between the electrochemical and non-electro chemical steps during NOR,which can guide the sustainable electrochemical synthesis of organic chemicals.

关键词： nucleophile oxidation reaction alcohol electrooxidation organic electrosynthesis nickel-based electrocatalysts C-C bond cleavage

来源：评论

学校读者我要写书评

暂无评论

Localization effect in single crystal of RuAs_(2)

引用

Chinese physics B 2024年第4期33卷 195-200页

作者：易哲铠刘琪光双魁徐升岳小宇梁慧李娜周颖吴丹丹孙燕李秋菊程鹏夏天龙孙学峰王义炎 Anhui Key Laboratory of Magnetic Functional Materials and Devices Institute of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Department of Physics and Key Laboratory of Strongly-Coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China School of Optical and Electronic Information Suzhou City UniversitySuzhou 215104China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

We report the magnetotransport and thermal properties of RuAs_(2) single ***_(2) exhibits semiconductor behavior and localization *** crossover from normal state to diffusive transport in the weak localization(WL)state and then to variable range hopping(VRH)transport in the strong localization state has been *** transitions can be reflected in the measurement of resistivity and Seebeck *** magnetoresistance(NMR)emerges with the appearance of localization effect and is gradually suppressed in high magnetic *** temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to *** measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization *** findings show that RuAs_(2) is a suitable platform to study the localized state.

关键词： weak localization variable range hopping RuAs_(2) single crystal

来源：评论

学校读者我要写书评

暂无评论

Porous Indium Nanocrystals on Conductive Carbon Nanotube Networks for High-Performance CO_(2)-to-Formate Electrocatalytic Conversion

引用

Energy & Environmental materials 2024年第4期7卷 413-421页

作者： Liangping Xiao Rusen Zhou Tianqi Zhang Xiaoxiang Wang Renwu Zhou Patrick J.Cullen Kostya(Ken)Ostrikov Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional MaterialsJiujiang Research InstituteXiamen UniversityXiamen 361005China School of Chemistry and Physics QUT Centre for Materials Science and QUT Centre for a Waste-Free WorldQueensland University of Technology(QUT)Brisbane QLD 4000Australia School of Chemical and Biomolecular Engineering University of SydneySydney NSW 2006Australia

Ever-increasing emissions of anthropogenic carbon dioxide(CO_(2))cause global environmental and climate *** by biological photosynthesis,developing effective strategies NeuNlto up-cycle CO_(2)into high-value organics is *** CO_(2)reduction reaction(CO_(2)RR)is highly promising to convert CO_(2)into economically viable carbon-based chemicals or fuels under mild process ***,mesoporous indium supported on multi-walled carbon nanotubes(mp-In@MWCNTs)is synthesized via a facile wet chemical *** mp-In@MWCNTs electrocatalysts exhibit high CO_(2)RR performance in reducing CO_(2)into *** outstanding activity(current density-78.5 mA cm^(-2)),high conversion efficiency(Faradaic efficiency of formate over 90%),and persistent stability(∼30 h)for selective CO_(2)-to-formate conversion are *** outstanding CO_(2)RR process performance is attributed to the unique structures with mesoporous surfaces and a conductive network,which promote the adsorption and desorption of reactants and intermediates while improving electron *** findings provide guiding principles for synthesizing conductive metal-based electrocatalysts for high-performance CO_(2)conversion.

关键词： CO_(2)RR conductive network electrocatalysts formate

来源：评论

学校读者我要写书评

暂无评论

Enabling stable 4.6 V LiCoO_(2) cathode through oxygen charge regulation strategy

引用

Journal of Energy Chemistry 2023年第1期76卷 557-565,I0014页

作者： Wen Zhang Xiaoyu Zhang Fangyuan Cheng Meng Wang Jing Wan Yuyu Li Jia Xu Yi Liu Shixiong Sun Yue Xu Chun Fang Qing Li Jiantao Han Yunhui Huang State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Applied Physics Chongqing UniversityChongqing 401331China Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan UniversityWuhan 430056HubeiChina

LiCoO_(2) is the preferred cathode material for consumer electronic products due to its high volumetric energy density. However, the unfavorable phase transition and surface oxygen release limits the practical application of LiCoO_(2)at a high-voltage of 4.6 V to achieve a higher energy density demanded by the market. Herein, both bulk and surface structures of LiCoO_(2)are stabilized at 4.6 V through oxygen charge regulation by Gd-gradient doping. The enrichment of highly electropositive Gd on LiCoO_(2) surface will increase the effective charge on oxygen and improve the oxygen framework stability against oxygen *** the other hand, Gd ions occupy the Co-sites and suppress the unfavorable phase transition and microcrack. The modified LiCoO_(2) exhibits superior cycling stability with capacity retention of 90.1% over 200 cycles at 4.6 V, and also obtains a high capacity of 145.7 m Ah/g at 5 C. This work shows great promise for developing high-voltage LiCoO_(2) at 4.6 V and the strategy could also contribute to optimizing other cathode materials with high voltage and large capacity, such as cobalt-free high-nickel and lithiumrich manganese-based cathode materials.

关键词： Li-ion batteries 4.6 V LiCoO_(2) Gd-gradient doping Oxygen charge Cycle stability

来源：评论

学校读者我要写书评

暂无评论

High energy storage density in NaNbO_(3) antiferroelectrics with double hysteresis loop

引用

Journal of Materiomics 2024年第5期10卷 1026-1035页

作者： Li Ma Zhenpei Chen Gengguang Luo Zhiyi Che Chao Xu Dongliang Shan Zhenyong Cen Qin Feng Xiyong Chen Toyohisa Fujita Ye Zhu Yunya Liu Jing-Feng Li Shujun Zhang Nengneng Luo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning530004China School of Chemistry and Chemical Engineering Guangxi UniversityNanning530004China Department of Applied Physics Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan411105HunanChina State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia

Antiferroelectrics(AFEs)possess great potential for high performance dielectric capacitors,due to their distinct double hysteresis loop with high maximum polarization and low remnant ***,the well-known NaNbO_(3) lead-free antiferroelectric(AFE)ceramic usually exhibits square-like P–E loop related to the irreversible AFE P phase to ferroelectric(FE)Q phase transition,yielding low recoverable energy storage density(Wrec).Herein,significantly improved Wrec up to 3.3 J/cm^(3) with good energy storage efficiency(η)of 42.4% was achieved in Na_(0.7)Ag_(0.3)Nb_(0.7)Ta_(0.3)O_(3)(30Agsingle bond30Ta)ceramic with well-defined double P–E loop,by tailoring the A-site electronegativity with Ag+and B-site polarizability with Ta^(5+).The Transmission Electron Microscope,Piezoresponse Force Microscope and in-situ Raman spectra results verified a good reversibility between AFE P phase and high-field-induced FE Q *** improved stability of AFE P phase,being responsible for the double P–E loop and improved Wrec,was attributed to the decreased octahedral tilting angles and cation *** mechanism was revealed by synchrotron X-ray diffraction and Scanning Transmission Electron *** work provides a good paradigm for achieving double P–E loop and high energy storage density in NaNbO_(3)-based ceramics.

关键词： Sodium niobate Antiferroelectrics Double hysteresis loop Energy storage performance Reversibility

来源：评论

学校读者我要写书评

暂无评论

A Review of the Application of Digital Image Correlation to Micromechanical Studies of Polymer Electrolytes 2

A Review of the Application of Digital Image Correlation to ...

引用

2nd International Conference on Multidisciplinary engineering and Applied science, ICMEAS 2023

作者： Obi, Uchenna C. Sanni, Dahiru Abraham, Bernice Adeniji, Sharafadeen A. Offia-Kalu, Nkechi E. Amune, Daniel Anye, Vitalis C. Bello, Abdulhakeem African University of Science and Technology Department of Materials Science and Engineering Abuja Nigeria Nile University Department of Physics Abuja Nigeria African University of Science and Technology Theoretical and Applied Physics Abuja Nigeria

ISBN: (纸本)9798350358834

High-performing lithium-ion batteries (LIBs) necessitate a stable solid electrolyte. When batteries are subjected to external loads, the electrolytes in LIBs are susceptible to irregular deformation distributions, which may result in an asymmetrical porosity distribution. Therefore, these electrolytes must be mechanically robust to withstand pressures and loads, such as significant volumetric changes in anode materials, as well as to prevent dendrite formation, which reduces their efficiency and extends LIB's lifespan. Numerous research methods and tools have been used to examine the mechanical characteristics of LIB components, including tensile, compression, flexural, hardness, and viscoelasticity experiments conducted using the universal testing machine and nanoindentation machine. However, this study discusses the digital image correlation (DIC) technique to examine the mechanical properties of solid electrolytes on a microscopic scale and how this technique has been and can be successfully used to improve our understanding of the strain distribution and effects on LIBs when the solid electrolyte is loaded. © 2023 IEEE.

关键词： Lithium-ion batteries

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：