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Glass formation, structure, relaxation, and property of metal-organic framework(MOF) glasses: A review

Progress in Natural Science:Materials International 2025年第1期35卷 98-121页

作者： Di Xu Chuanqi Pan Institute of Chemistry Henan Academy of Sciences College of Environmental Engineering Henan University of Technology

Metal-organic framework(MOF) glasses have emerged as a novel fourth class of inorganic-organic hybrid glasses,separate from traditional inorganic, organic, and metallic glasses. They exhibit unique properties and hold significant potential for diverse applications. In this review, we provide a comprehensive summary of the systematic classification, glass-forming methods, structure, and relaxation. Additionally, we present an extensive examination of various properties such as mechanical features, optical characteristics, and thermal transport aspects; as well as applications encompassing gas absorption and separation, ion transport, catalysis, and ***, a focused examination of recently reported novel carboxylic MOF glasses, in conjunction with previously unaddressed studies on relaxation dynamics and thermodynamics, serves to emphasize the significant challenges encountered by MOF glasses while simultaneously highlighting promising opportunities.

关键词： Glass formation MOF glass Property Relaxation Structure

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Feedback switching adaptive control for trajectory tracking in walking piezoelectric actuator

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Precision engineering 2025年 95卷 10-23页

作者： Ruan, Zhiwei Li, Qin Guo, Liang Ding, Chenyang Academy for Engineering & Technology Fudan University Shanghai200433 China

The nonlinear characteristics and continuous foot switching in Walking Piezoelectric Actuator (WPA) necessitate an applicable control scheme for practical application. This paper proposes a Feedback Switching Adaptive Control (FSAC) based on Adaptive Proportional-Integral-Derivative (APID) and aligned with the WPA driving principles for trajectory tracking control. A Quantum Particle Swarm Optimization-based Neural Network (QPSNN) is employed for online tuning of APID control gains. The APID based on QPSNN eliminates the need to model nonlinearity and foot switching, dynamically adjusts control parameters in real time. The FSAC incorporates WPA driving principles with APID to enable precise tracking control under foot-switching conditions. The stability of the proposed APID is theoretically analyzed using a Lyapunov framework. Comparative experiments under different trajectories and varying loads were conducted on the self-designed WPA stage. The proposed FSAC is verified the superior tracking performance and strong variable load adaptability in experiment. © 2025 Elsevier Inc.

关键词： Piezoelectric actuators

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Highly conductive and stable iodine doped argyrodite electrolyte for all-solid-state lithium batteries

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Journal of Energy Chemistry 2025年第1期100卷 50-58页

作者： Gaozhan Liu Jing Zhang Jing Yang Jinghui Chen Xingyue Xiao Xiayin Yao Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Lithium argyrodites with high ionic conductivity and low cost are considered as one of the most prospective solid electrolytes for all-solid-state lithium ***,the poor chemical stability and compatibility with lithium metal limit their ***,Li_(5.4)PS_(4.4)Cl1.4I0.2solid electrolyte with high ionic conductivity of 11.49 m S ccm^(-1)and improved chemical stability is synthesized by iodine *** ultra-thin Li_(5.4)PS_(4.4)Cl_(1.4)I_(0.2)membrane with thickness of 10μm can be obtained by wet coating process,exhibiting a high ionic conductivity of 2.09 mS ccm^(-1)and low areal resistance of 1.17Ωcm^(-2).Moreover,iodine doping could in-situ form LiI at the lithium/electrolyte interface and improve the critical current density of Li_(5.4)PS_(4.4)Cl_(1.6)from 0.8 to 1.35 mA cm^(-2).The resultant LiCoO_(2)/Li_(5.4)PS_(4.4)Cl_(1.4)I_(0.2)/Li battery shows excellent cycling stability at 1 C,with a reversible specific capacity of 110.1 mA h g^(-1)and a retention of 80.5% after 1000 *** addition,the assembled LiCoO_(2)/Li_(5.4)PS_(4.4)Cl_(1.4)I_(0.2)membrane/Li pouch cell delivers an initial discharge capacity of 110.4 mA h g^(-1)and 80.5% capacity retention after 100 cycles.

关键词： Argyrodite electrolytes lodine doping lonic conductivity Stability All-solid-state lithium battery

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Phase formation mechanism of Cr2AlC MAX phase coating:In-situ TEM characterization and atomic-scale calculations

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材料科学技术（英文版） 2025年第3期206卷 176-184页

作者： Guanshui Ma Haichen Wu Zhi Fang Xiaohui Zhou Rende Chen Wei Yang Jiayue Zhang Zhenyu Wang Aiying Wang Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Analytical Center Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Beijing Innovation Centre for Engineering Science and Advanced Technology School of Materials Science and EngineeringPeking UniversityBeijing 100871China

Cr2AlC,a representative MAX phase,gains increasing attention for the excellent oxidation tolerance and corrosion resistance used in harsh high temperature and strong radiation ***,the lack of the phase formation mechanism has become the key bottleneck to the practical applications for Cr2AlC synthesis with high purity at low *** this work,we fabricated the amorphous Cr-Al-C coating by a hybrid magnetron sputtering/cathodic arc deposition technique,in which the in-situ heating transmission electron microscopy(TEM)was conducted in a temperature range of 25-650 ℃ to address the real-time phase transformation for Cr2AlC *** results demonstrated that increas-ing the temperature from 25 to 370 ℃ led to the structural transformation from amorphous Cr-Al-C to the crystalline Cr2Al ***,the high-purity Cr2AlC MAX phase was distinctly formed at 500 ℃,accompanied by the diminished amorphous *** the further increase of temperature to 650 ℃,the decomposition of Cr2AlC to Cr7C3 impurities was *** phase evolution was also evidenced by the Ab-initio molecular dynamics calculations,where the bond energy of Cr-Cr,Cr-Al,and Cr-C played the key role in the formed crystalline stability during the heating *** observa-tions not only provide fundamental insight into the phase formation mechanism for high-purity Cr2AlC coatings but also offer a promising strategy to manipulate the advanced MAX phase materials with high tolerance to high-temperature oxidation and heavy ion radiations.

关键词： Cr2AlC MAX phases In-situ heating transmission electron microscopy Phase formation Bond energy

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Domain generalization with semi-supervised learning for people-centric activity recognition

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Science China(Information Sciences) 2025年第1期68卷 171-188页

作者： Jing LIU Wei ZHU Di LI Xing HU Liang SONG Academy for Engineering & Technology Fudan University Shanghai East-bund Research Institute on Networking Systems of AI School of Optoelectronic Information and Computer Engineering University of Shanghai for Science & Technology

People-centric activity recognition is one of the most critical technologies in a wide range of real-world applications,including intelligent transportation systems, healthcare services, and brain-computer interfaces. Large-scale data collection and annotation make the application of machine learning algorithms prohibitively expensive when adapting to new tasks. One way of circumventing this limitation is to train the model in a semi-supervised learning manner that utilizes a percentage of unlabeled data to reduce the labeling burden in prediction tasks. Despite their appeal, these models often assume that labeled and unlabeled data come from similar distributions, which leads to the domain shift problem caused by the presence of distribution gaps. To address these limitations, we propose herein a novel method for people-centric activity recognition,called domain generalization with semi-supervised learning(DGSSL), that effectively enhances the representation learning and domain alignment capabilities of a model. We first design a new autoregressive discriminator for adversarial training between unlabeled and labeled source domains, extracting domain-specific features to reduce the distribution gaps. Second, we introduce two reconstruction tasks to capture the task-specific features to avoid losing information related to representation learning while maintaining task-specific consistency. Finally, benefiting from the collaborative optimization of these two tasks, the model can accurately predict both the domain and category labels of the source domains for the classification task. We conduct extensive experiments on three real-world sensing datasets. The experimental results show that DGSSL surpasses the three state-of-the-art methods with better performance and generalization.

关键词： activity recognition deep learning domain generalization semi-supervised learning adversarial training

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Thermal decomposition mechanism and particle size regulation in calcination of barium titanyl oxalate tetrahydrate for fabricating barium titanate nanoparticles

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Particuology 2025年第3期98卷 94-104页

作者： Yunfei Yan Haixia Zhang Junrong Yue Yu Guan Lei Shao State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Research Center of the Ministry of Education for High Gravity Engineering and Technology College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing100029China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Barium titanate(BaTiO_(3))is an important ferroelectric and electronic ceramic material because of its outstanding dielectric and ferroelectric *** demand for BaTiO_(3) nanoparticles with adjustable particle size has increased extensively due to the miniaturization of electronic *** oxalate precipitation method is regarded as a highly attractive technology for fabricating BaTiO_(3) nanoparticles,as it enables large-scale production at a low ***,the calcination process is a crucial step that significantly influences the particle size and morphology of the obtained BaTiO_(3) *** study investigates the thermal decomposition mechanism and particle size regulation strategies during the calcination of barium titanyl oxalate tetrahydrate(BTOT)for fabricating BaTiO_(3) *** Kissinger-Akahira-Sunose(KAS)model is used to calculate the kinetic parameters of BTOT thermal decomposition process,and the results indicate that the decomposition process can be divided as four stages,with the average activation energy of 60.77,269.89,484.72,and 199.82 kJ/mol,*** average activation energy reaches its maximum value in the third stage,indicating that the thermal decomposition reaction in this stage is more challenging to occur compared to the other *** gas release behaviors of H_(2)O,CO,and CO_(2) are analyzed on-line during the thermal decomposition of BTOT,and the overall reaction mechanism is ***,by adjusting the calcination parameters,the particle size of BaTiO_(3) could be effectively regulated within the range of 25-120 *** the heating rate from 10 to 40 K/min decreases the average particle size of BaTiO_(3) from 62 to 44 *** the calcination time from 0 to 120 min increases the average particle size from 25 to 71 *** the terminal temperature from 1173 to 1273 K significantly increases the average particle size from 56 to 120 ***,accelerating the heating rat

关键词： BaTiO_(3) Barium titanyl oxalate tetrahydrate Thermal decomposition Activation energy

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Development of a Capacity Allocation Model for the Multi-Energy Hybrid Power System

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Journal of Thermal Science 2025年第3期34卷 936-952页

作者： FU Jinming ZENG Guang JI Yang ZHOU Anqi Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences SPIC Northeast Energy Technology Co. Ltd Sembcorp Industries Ltd

The application of multi-energy hybrid power systems is conducive to tackling global warming and the low-carbon transition of the power system.A capacity allocation model of a multi-energy hybrid power system including wind power,solar power,energy storage,and thermal power was developed in this *** evaluation index was defined as the objective function,formulated by normalizing the output fluctuation,economic cost,and carbon dioxide *** under different initial conditions and output electric power scenarios were carried out with genetic *** capacity allocation model was validated with the literature results,with errors of less than 5%.Results indicate that the capacity allocation modes of the multi-energy hybrid power system can be divided into thermal power dominated mode,multi-energy complementary mode,and renewable power dominated *** addition,the division of capacity allocation modes is not affected by the weather conditions and energy storage *** capacity factor decreases from 0.4 to 0.24 as the power system changes from the thermal power dominated mode to the renewable power dominated *** the output electric power is 240 MW,300 MW,and 340 MW,the optimal energy storage ratio is 10%,18%,and 16%,*** model developed in this study not only enriches the theory of multi-energy complementary power generation but also guides the engineering design of the wind-photovoltaics-thermal-storage system targeting smart grid and be beneficial for the middle-long-term planning of the green and low-carbon transition of the power system.

关键词： capacity allocation model energy storage ratio hybrid energy power system multi-energy complementary planning scenario

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Mechanical and electrochemical properties of(MoNbTaTiZr)1-xNx high-entropy nitride coatings

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材料科学技术（英文版） 2025年第5期208卷 78-91页

作者： Wei Yang Jianxiao Shen Zhenyu Wang Guanshui Ma Peiling Ke Aiying Wang Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

High-entropy materials possess high hardness and strong wear resistance,yet the key bottleneck for their practical applications is the poor corrosion resistance in harsh *** this work,the high-entropy nitride(HEN)coatings of(MoNbTaTiZr)1-xNx(x=0-0.47)were fabricated using a hybrid di-rect current magnetron sputtering *** research focus was dedicated to the effect of nitrogen content on the microstructure,mechanical and electrochemical *** results showed that the as-deposited coatings exhibited a typical body-centered cubic(BCC)structure without nitrogen,while the amorphous matrix with face-centered cubic(FCC)nanocrystalline grain was observed at x=*** increasing x in the range of 0.35-0.47 caused the appearance of polycrystalline FCC phase in *** with the MoNbTaTiZr metallic coating,the coating containing nitrogen favored the high hard-ness around 13.7-32.4 GPa,accompanied by excellent tolerance both against elastic and plastic ***,such N-containing coatings yielded a low corrosion current density of about 10-8-10-7 A/cm2 and high electrochemical impedance of 106 Ω cm2 in 3.5 wt.％NaCl solution,indicating the supe-rior corrosion *** reason for the enhanced electrochemical behavior could be ascribed to the spontaneous formation of protective passive layers over the coating surface,which consisted of the domi-nated multi-elemental oxides in chemical ***,noted that the(MoNbTaTiZr)0.83N0.17 coat-ing displayed the highest hardness of 32.4±2.6 GPa and H/E ratio at 0.09,together with remarkable cor-rosion resistance,proposing the strongest capability for harsh-environmental applications required both good anti-wear and anti-corrosion performance.

关键词： High-entropy nitride Magnetron sputtering Microstructure Mechanical property Corrosion behavior

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High-performance self-rectifying memristor array based on Pt/HfO_(2)/Ta_(2)O_(5−x)/Ti structure for flexible electronics

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Nano Research 2025年第2期18卷 708-716页

作者： Shang He Xiaoyu Ye Xiaojian Zhu Qing Zhong Yulin Liu Gang Li Rui Liu Xiaohan Meng Yongguang Xiao Shaoan Yan Minghua Tang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Chinese Academy of Sciences(CAS)Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105China

Self-rectifying memristor(SRM)arrays hold tremendous potential in high-density data storage and energy efficient neuromorphic ***,SRM arrays are mostly developed on rigid substrates and lack mechanical flexibility,limiting their applications in intelligent electronic skin,wearable technologies,***,we present a high performance SRM array based on Pt/HfO_(2)/Ta_(2)O_(5−x)/Ti heterojunctions,which can be fabricated on a flexible polyimides(PI)substrate and demonstrates exceptional memristive performance under bending conditions(bending radius(R)=1 cm,rectifying ratio>10^(4),retention time>10^(4) s and endurance>105 cycles).We demonstrate a 16×16 flexible memristor array offering noise filtering and data storage capabilities,which can be used to accurately process and store the signals transmitted by a pressure sensor *** research represents an important advancement towards the realization of next-generation high-performance flexible electronics.

关键词： self-rectifying memristor crossbar array flexible electronics noise filtering tactile memory

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Recent progress in sulfonyl fluoride synthesis via the radical sulfur dioxide insertion and fluorination strategy

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Science China Chemistry 2025年第5期68卷 1763-1778页

作者： Haozhen Zhang Wangchuan Xiao Fanhong Wu Xiaoyu Ma Chao Liu School of Chemical and Environmental Engineering Shanghai Institute of Technology Shanghai-Sanming Engineering Research Center of Green Fluoropharmaceutical Technology Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences

Sulfonyl fluoride compounds, as the key components for sulfur(VI) fluoride exchange(SuFEx) reaction, are characterized by their high chemical stability yet can be selectively activated under specific conditions to enable efficient chemical bonding and connections. This unique capability has garnered significant interest across various domains. Many strategies have been developed for the synthesis of sulfonyl fluoride compounds. This review focuses on the latest advancements in synthesizing these compounds using the radical sulfur dioxide insertion and fluorination(RSIF) strategy, underscoring the versatility and efficacy of the RSIF strategy in constructing sulfonyl fluoride compounds.

关键词： organofluorine chemistry sulfonyl fluoride RSIF strategy click chemistry synthetic methods

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