检索结果-南通市图书馆

Enhanced dynamics of Al3+/H+ ions in aqueous aluminum ion batteries:Construction of metastable structures in vanadium pentoxide upon oxygen vacancies

引用

Journal of Energy Chemistry 2025年第2期101卷 562-569页

作者： Zhibao Wang Hanqing Gu Tianci Wu Wenming Zhang Zhanyu Li hebei Key Laboratory of Optic-Electronic Information and Materials National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices College of Physics Science and Technology Hebei University

In recent years,aqueous aluminum ion batteries have been widely studied owing to their abundant energy storage and high theo retical *** in-depth study of vanadium oxide materials is necessary to address the precipitation of insoluble products covered cathode surface and the slow reaction ***,a method using a simple one-step hydrothermal preparation and oxalic acid to regulate oxygen vacancies has been reported.A high starting capacity(400 mAh g-1) can be achieved by Ov-V2O5,and it is capable of undergoing 200 cycles at 0.4 A g-1,with a termination discharge capacity of103 mAh *** analysis demonstrated that metastable structures（AlxV2O5and HxV2O5） were constructed through the insertion of Al3+/H+during discharging,which existed in the lattice intercalation with *** incorporation of oxygen vacancies lowers the reaction energy barrier while improving the ion transport *** addition,the metastable structure allows the electrostatic interaction between Al3+and the main backbone to establish protection and optimize the transport *** parallel,this work exploits ex-situ characterization and DFT to obtain a profound insight into the instrumental effect of oxygen vacancies in the construction of metastable structures during in-situ electrochemical activation,with a view to better understanding the mechanism of the synergistic participation of Al3+and H+in the *** work not only reports a method for cathode materials to modulate oxygen vacancies,but also lays the foundation for a deeper understanding of the metastable structure of vanadium oxides.

关键词： Electrochemical activation Metastable structure Oxygen vacancies Vanadium pentoxide

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Encapsulating lipase on the surface of magnetic ZIF-8 nanosphers with mesoporous SiO2 nano-membrane for enhancing catalytic performance

引用

Chinese Chemical Letters 2025年第2期36卷 279-283页

作者： Guang-Xu Duan Queting Chen Rui-Rui Shao Hui-Huang Sun Tong Yuan Dong-Hao Zhang college of Pharmaceutical science Hebei University Affiliated Hospital of hebei university Key Laboratory of Pharmaceutical Quality Control of hebei Province College of Pharmaceutical ScienceHebei University Institute of Life science and Green Development Hebei University

The preparation of immobilized enzyme with excellent performance is one of the difficulties that restrict the application of enzyme catalysis technology. Here, Candida rugosa lipase（CRL） was firstly adsorbed on the surface of magnetic zeolitic imidazolate framework-8（ZIF-8） nanospheres, which was further encapsulated with a mesoporous SiO2nano-membrane formed by tetraethyl orthosilicate（TEOS） polycondensation. Consequently, lipase could be firmly immobilized on carrier surface by physical binding rather than chemical binding, which did not damage the active conformation of enzyme. There were mesopores on the silica nano-membrane, which could improve the accessibility of enzyme and its apparent catalytic activity. Moreover, silica membrane encapsulation could also improve the stability of enzyme, suggesting an effective enzyme immobilization strategy. It showed that TEOS amount and the encapsulation time had significant effects on the thickness of silica membrane and the enzyme activity. The analysis in enzyme activity and protein secondary structure showed that lipase encapsulated in silica membrane retained the active conformation to the greatest extent. Compared with the adsorbed lipase, the encapsulated lipase increased its thermostability by 3 times and resistance to chemical denaturants by 7 times. The relative enzyme activity remained around 80% after 8 repetitions, while the adsorbed lipase only remained at7.3%.

关键词： Encapsulation Enzyme immobilization Lipase activity Mesoporous silica membrane ZIF-8

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Local magnetic moment oscillation around an Anderson impurity on graphene

引用

science China(physics,Mechanics & Astronomy) 2025年第1期68卷 188-197页

作者： Shuai Li Zhen Ma Jin-Hua Gao School of science Hebei University of Science and TechnologyShijiazhuang 050018China School of Electronics and Information Zhengzhou University of Light IndustryZhengzhou 450002China School of physics and Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China

We theoretically investigate the spin resolved Friedel oscillation(FO)and quasiparticle interference(QPI)in graphene induced by an Anderson *** the impurity becomes magnetic,the resulted FO becomes spin dependent,which gives rise to a local magnetic moment oscillation with an envelop decaying as r^(-2) in real space in the doping ***,at half filling,the electron density and local magnetic moment will not oscillate but decay as r^(-3).Such spin resolved FO has both sublattice and spin ***,the local magnetic moment decay at half filling only occurs at one sublattice of graphene,which is quite like the phenomenon observed in the STM experiment(***ález-Herrero et al.,science 352,437(2016)).We further give an analytic formula about such spin dependent FO based on the stationary phase ***,we study the interference of quasiparticles around the magnetic impurity by calculating the spin dependent Fourier-transformed local density of states(FT-LDOS).Our work gives a comprehensive understanding about the local magnetic moment oscillation around an Anderson impurity on graphene.

关键词： Friedel oscillation local magnetic moment graphene Anderson impurity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Giant enhancement of negative friction by resonant coupling between localized surface phonon polaritons and graphene plasmonics

引用

Chinese physics B 2025年第1期34卷 324-329页

作者： Kaipeng Liu Shuai Zhou Shiwei Dai Lixin Ge School of physics and Electronic Engineering Xinyang Normal UniversityXinyang 464000China college of Mathematics and physics Chengdu University of TechnologyChengdu 610059China Department of Basic Courses Zhengzhou University of Science and TechnologyZhengzhou 450064China

Negative friction refers to a frictional force that acts in the same direction as the motion of an object, which has been predicted in terahertz(THz) gain systems [Phys. Rev. B 108 045406(2023)]. In this work, we investigate the enhancement of the negative friction experienced by nanospheres placed near a graphene substrate. We find that the magnitude of negative friction is related to the resonant coupling between the surface plasmon polaritons(SPPs) of the graphene and localized surface phonon polaritons(LSPh P) of nanospheres. We exam nanospheres consisted of several different materials, including SiO_(2), Si C, Zn Se, Na Cl, ln Sb. Our results suggest that the LSPh P of Na Cl nanospheres match effectively with the amplified SPPs of graphene sheets. The negative friction for Na Cl nanospheres can be enhanced about one-to-two orders of magnitude compared to that of silica(SiO_(2)) nanospheres. At the resonant peak of negative friction, the required quasi-Fermi energy of graphene is lower for Na Cl nanospheres. Our finds hold great prospects for the mechanical manipulations of nanoscale particles.

关键词： quantum friction surface phonon polaritons surface plasmon polaritons graphene

来源：

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

Topological states constructed by two different trivial quantum wires

引用

Chinese physics B 2025年第1期34卷 246-255页

作者： Jing-Run Lin Linxi Lv Zheng-Wei Zuo School of physics and Engineering Henan University of Science and TechnologyLuoyang 471023China

The topological states of the two-leg and three-leg ladders formed by two trivial quantum wires with different lattice constants are theoretically investigated. Firstly, we take two trivial quantum wires with a lattice constant ratio of 1:2 as an example. For the symmetric nearest-neighbor intra-chain hopping two-leg ladder, the inversion symmetry protected topological insulator phase with two degenerate topological edge states appears. When the inversion symmetry is broken, the topological insulators with one or two topological edge states of different energies and topological metals with edge states embedded in the bulk states could emerge depending on the filling factor. The topological origin of these topological states in the two-leg ladders is the topological properties of the Chern insulators and Chern metals. According to the arrangement of two trivial quantum wires, we construct two types of three-leg ladders. Each type of the three-leg ladder could be divided into one trivial subspace and one topological nontrivial subspace by unitary transformation. The topological nontrivial subspace corresponds to the effective two-leg ladder model. As the filling factor changes, the system could be in topological insulators or topological metals phases. When the two-leg ladder is constructed by two trivial quantum wires with a lattice constant ratio of 1:3 and 2:3, the system could also realize rich topological states such as the topological insulators and topological metals with the topological edge states. These rich topological states in the two-leg and three-leg ladders could be confirmed by current experimental techniques.

关键词： trivial quantum wire topological invariant inversion symmetric topological insulator Chern metal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel method for simultaneous measurement of^(222)Rn and^(220)Rn progeny concentrations measured by an alpha spectrometer

引用

Nuclear science and Techniques 2025年第1期36卷 127-139页

作者： Zhong-Kai Fan Jia-Le Sun Hao-Xuan Li Xiang-Ming Cai Hui Yang Shou-Kang Qiu Yan-Liang Tan Jian Shan School of Nuclear science and technology University of South ChinaHengyang 421001China college of physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008China

The accumulation of^(222)Rn and^(220)Rn progeny in poorly ventilated environments poses the risk of natural radiation exposure to the public.A previous study indicated that satisfactory results in determining the^(222)Rn and^(220)Rn progeny concentrations by measuring the total alpha counts at five time intervals within 560 min should be expected only in the case of high progeny concentrations in *** complete the measurement within a relatively short period and adapt it for simultaneous measurements at comparatively lower^(222)Rn and^(220)Rn progeny concentrations,a novel mathematical model was proposed based on the radioactive decay *** model employs a nonlinear fitting method to distinguish nuclides with overlapping spectra by utilizing the alpha particle counts of non-overlapping spectra within consecutive measurement cycles to obtain the concentrations of^(222)Rn and^(220)Rn progeny in *** verification experiments were conducted using an alpha *** experimental results demonstrate that the concentrations of^(222)Rn and^(220)Rn progeny calculated by the new method align more closely with the actual circumstances than those calculated by the total count method,and their relative uncertainties are all within±16%.Furthermore,the measurement time was reduced to 90 min,representing an acceleration of 84%.The improved capability of the new method in distinguishing alpha particles with similar energies emitted from ^(218)Po and^(212)Bi,both approximately 6 MeV,contributed to realizing more accurate *** proposed method has the potential advantage of measuring relatively low concentrations of^(222)Rn and^(220)Rn progeny in air more quickly via air filtration.

关键词： ^(222)Rn ^(220)Rn Progeny concentration Nonlinear fitting method Alpha spectrometer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phase-matching enhanced quantum phase and amplitude estimation of a two-level system in a squeezed reservoir

引用

Chinese physics B 2025年第1期34卷 257-263页

作者： Yan-Ling Li Cai-Hong Liao Xing Xiao School of Information Engineering Jiangxi University of Science and TechnologyGanzhou 341000China college of physics and Electronic Information Gannan Normal UniversityGanzhou 341000China

Squeezed reservoir engineering is a powerful technique in quantum information that combines the features of squeezing and reservoir engineering to create and stabilize non-classical quantum states. In this paper, we focus on the previously neglected aspect of the impact of the squeezing phase on the precision of quantum phase and amplitude estimation based on a simple model of a two-level system(TLS) interacting with a squeezed reservoir. We derive the optimal squeezed phase-matching conditions for phase φ and amplitude θ parameters, which are crucial for enhancing the precision of quantum parameter estimation. The robustness of the squeezing-enhanced quantum Fisher information against departures from these conditions is examined, demonstrating that minor deviations from phase-matching can still result in remarkable precision of estimation. Additionally, we provide a geometric interpretation of the squeezed phase-matching conditions from the classical motion of a TLS on the Bloch sphere. Our research contributes to a deeper understanding of the operational requirements for employing squeezed reservoir engineering to advance quantum parameter estimation.

关键词： quantum parameter estimation squeezed reservoir phase-matching conditions quantum Fisher information

来源：

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

Preparation and applications of calcium ferrite as a functional material:A review

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 292-310页

作者： Xiuli Han Bowen Duan Lei Liu Shilong Fang Weiwei Wang college of Mining Engineering North China University of Science and TechnologyTangshan 063210China Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources of hebei Province Tangshan 063210China Key Laboratory of Mining Development and Security technology of hebei Province Tangshan 063210China

Calcium ferrite(CF)is recognized as a potential green and efficient functional material because of its advantages of magnetism,electrochemistry,catalysis,and biocompatibility in the fields of materials chemistry,environmental engineering,and ***-fore,the obtained research results need to be systematically summarized,and new perspectives on CF and its composite materials need to be *** on the presented studies of CF and its composite materials,the types and structures of the crystal are *** addition,the current application technologies and theoretical mechanisms with various properties in different fields are ***,the various preparation methods of CF and its composite materials are elaborated in *** importantly,the advantages and disadvantages of the synthesis methods of CF and its composite materials are discussed,and the existing problems and emerging challenges in practical production are ***,the key future research directions of CF and its composite materials have been prospected from the potential application technologies to provide references for its synthesis and efficient utilization.

关键词： calcium ferrite mineral functional materials preparation application perspectives

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Jet tagging with more-interaction particle transformer

引用

Chinese physics C 2025年第1期49卷 164-176页

作者： Yifan Wu Kun Wang Congqiao Li Huilin Qu Jingya Zhu college of science University of Shanghai for Science and TechnologyShanghai 200093China School of physics and State Key Laboratory of Nuclear physics and technology Peking UniversityBeijing 100871China CERN EP DepartmentCH-1211 Geneva 23Switzerland School of physics and Electronics Henan UniversityKaifeng 475004China

In this paper,we introduce the More-Interaction Particle Transformer(MIParT),a novel deep-learning neural network designed for jet *** framework incorporates our own design,the More-Interaction Attention(MIA)mechanism,which increases the dimensionality of particle interaction *** tested MIParT using the top tagging and quark-gluon *** results show that MIParT not only matches the accuracy and AUC of LorentzNet and a series of Lorentz-equivariant methods,but also significantly outperforms the ParT model in background ***,it improves background rejection by approximately 25% with a signal efficiency of 30% on the top tagging dataset and by 3% on the quark-gluon ***,MIParT requires only 30% of the parameters and 53% of the computational complexity needed by ParT,proving that high performance can be achieved with reduced model *** very large datasets,we double the dimension of particle embeddings,referring to this variant as MIParT-Large(MIParT-L).We found that MIParT-L can further capitalize on the knowledge from large *** a model pre-trained on the 100M JetClass dataset,the background rejection performance of fine-tuned MIParT-L improves by 39% on the top tagging dataset and by 6% on the quark-gluon dataset,surpassing that of fine-tuned ***,the background rejection of fine-tuned MIParT-L improves by an additional 2% compared to that of fine-tuned *** results suggest that MIParT has the potential to increase the efficiency of benchmarks for jet tagging and event identification in particle physics.

关键词： jet tagging collider physics machine learning

来源：

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

Bound state noise-like pulses generation from composite filtering effects

引用

Optoelectronics Letters 2025年第3期21卷 142-148页

作者： CHANG Qingyu ZHANG Caishi college of physics & Optoelectronic Engineering Jinan University Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic technology School of Physics and Optoelectronic EngineeringMacau University of Science and Technology School of Innovation Engineering Macau University of Science and Technology

This paper demonstrated the generation of multi-wavelength bound state noise-like pulse (BNLP) in a dispersion-managed composite-filtered fiber laser consisting of nonlinear polarization rotation (NPR) and *** the case of BNLP,the generation is caused by the interaction between two noise-like pulses (NLPs) induced by the comb-filtering effect,and bound state level can be artificially controlled in the *** work provides a new method for generating low-coherence pulses and establishes a research idea for the study of the comb-filtering effects.

关键词： A

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：