检索结果-南通市图书馆

Nano-Micro Letters 2025年第1期17卷 191-204页

作者： Zizhuang He lingzi shi Ran Sun lianfei Ding Mukun He Jiaming li Hua Guo Tiande Gao Panbo liu School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129People’s Republic of China School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

Gradient magnetic heterointerfaces have injected infinite vitality in optimizing impedance matching,adjusting dielectric/magnetic resonance and promoting electromagnetic(EM)wave absorption,but still exist a significant challenging in regulating local phase ***,accordion-shaped Co/Co_(3)O_(4)@N-doped carbon nanosheets(Co/Co_(3)O_(4)@NC)with gradient magnetic heterointerfaces have been fabricated via the cooperative high-temperature carbonization and lowtemperature oxidation *** results indicate that the surface epitaxial growth of crystal Co_(3)O_(4) domains on local Co nanoparticles realizes the adjustment of magnetic-heteroatomic components,which are beneficial for optimizing impedance matching and interfacial ***,gradient magnetic heterointerfaces simultaneously realize magnetic coupling,and long-range magnetic ***,the synthesized Co/Co_(3)O_(4)@NC absorbents display the strong electromagnetic wave attenuation capability of−53.5 dB at a thickness of 3.0 mm with an effective absorption bandwidth of 5.36 GHz,both are superior to those of single magnetic domains embedded in carbon *** design concept provides us an inspiration in optimizing interfacial polarization,regulating magnetic coupling and promoting electromagnetic wave absorption.

关键词： Magnetic heterointerfaces Phase evolution Interfacial polarization Magnetic coupling Electromagnetic wave absorption

维普期刊数据库

Tailor-made high elasticity and low-hysteresis hydrogels based on asymmetric H-bonding crosslinking for wearable applications

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Xiaofang shi Nan shi Miaomiao Dang Chengyu Ji Yingjie li Peiyi Wu Zhiguo Hu Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals Henan Engineering Laboratory of Chemical Pharmaceutical and Biomedical Materials School of Chemistry and Chemical Engineering Henan Normal University State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Chemistry Chemical Engineering and Biotechnology & Center for Advanced Low-dimension Materials Donghua University

The conventional method of fabricating hydrogels constantly confronts the conflict between elasticity and toughness, limiting their repetitive application. Achieving the desired elasticity through a simple and low-cost approach is a significant challenge for hydrogels, particularly through rational molecular design. Here, low-hysteresis and high-toughness hydrogels are developed from the design of a new feature monomer, N-acryloylethylsemicarbazide (NACE). Based on a concept of “asymmetric Hbonding design”, the unique double and triple H-bonding of NACE can result in a novel asymmetric crosslinking polymer with alternating strong and weak H-bonding regions. The NACE is copolymerized with acrylamide (AM) to regulate the mechanical properties of hydrogel via H-bonding density. The P(NACE-AM) ionic hydrogels are obtained simply and rapidly via one-step photopolymerization without a chemical cross-linking agent. The P(NACE-AM) hydrogels combine superb mechanical elasticity and toughness, and excellent ionic conductivity, showing great potential as durable ionic conductive devices for wearable utilization.

关键词：

Cooperative output regulation of heterogeneous directed multi-agent systems: a fully distributed model-free reinforcement learning framework

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年

作者： Xiongtao shi Yanjie li Chenglong DU Huiping li Chaoyang CHEN Weihua GUI Guangdong Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics School of Mechanical Engineering and Automation Harbin Institute of Technology (Shenzhen) School of Automation Central South University School of Marine Science and Technology Northwestern Polytechnical University School of Information and Electrical Engineering Hunan University of Science and Technology

In this paper, the cooperative output regulation (COR) problem of a class of unknown heterogeneous multi-agent systems (MASs) with directed graphs is studied via a model-free reinforcement learning (RL) based fully distributed eventtriggered control (ETC) strategy. First, we consider the scenario that the exosystem is accessible globally to all agents, an internal model-based augmented algebraic Riccati equation (AARE) is constructed, and its solution is learned by the proposed model-free RL algorithm via online input-output data. Further, for the scenario that the exosystem is accessible only to its adjacent followers, the distributed observers are designed for each agent to get the state of the exosystem, and an internal modelbased fully distributed adaptive ETC protocol is then synthesized to construct the corresponding AARE, and the feedback gain matrix is learned in a model-free fashion. The model-free RL-based control protocol proposed in this paper can not only remove the prior knowledge of agents’ dynamics, but also release the dependence on global information by the adaptive event-triggered mechanism (ETM) and the new graph-based Lyapunov function. Finally, simulation results are illustrated to show the feasibility and effectiveness of the proposed control scheme.

关键词：

Calibration of the Solar X-ray Detector on-board the Macao Science Satellite-1B for Soft X-ray Detection

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 11-26页

作者： Man-Hei NG Xiaoping ZHANG Jianwu CHEN Yongqiang shi Fuchang ZUO Wenxi PENG Weichun FU liansheng li Pengwei LUO Chi-Long TANG Guozheng ZHANG Zhiwu MEI li WANG Cunhui li Jiaming OU Yanyan XU State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology China National Space Administration (CNSA) Macau Center for Space Exploration and Science Space Optoelectronic Measurement and Perception Laboratory Beijing Institute of Control Engineering Institute of High Energy Physics Chinese Academy of Sciences Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics

The Solar X-ray Detector(SXD) on-board the Macao Science Satellite-1B(MSS-1B) was successfully launched via the Chinese Long March-2C rocket on 21 May 2023, and commenced operations in early June of the same year. The MSS-1B/Soft X-ray Detection Units(SXDUs) employ two silicon drift detectors(SDDs), providing a wide range of energy spectra spanning from 0.7 to 24 keV. Notably, the SXDUs deliver a high-resolution capability of 0.14 keV@5.9 keV and operate with a time cadence of 1 second. Here, we perform thorough calibrations of the MSS-1B/SXDUs, employing a combination of ground experiments and simulations. In addition, quantitative analysis comparing the flux measurements obtained by the MSS-1B/SXDUs to the data collected by the Geostationary Operational Environmental Satellite(GOES), provides compelling evidence of their consistency. Furthermore, the preliminary spectral analysis results showcase the robustness and expected performance of the MSS-1B/SXDUs, unlocking their potential for facilitating the study of dynamic evolution of solar flares. Moreover, the innovative MSS-1B/Solar X-ray Detector facilitates concurrent observations of solar soft and hard X-rays, thereby making valuable contributions to the advancements in solar research.

关键词： Macao Science Satellite-1B (MSS-1B) Calibration Solar X-Ray Detector Spectrometer Soft X-rays Solar flares Solar abundances

Boosting hydrocarbon conversion via Cu-doping induced oxygen vacancies on CeO2 in CO2 electroreduction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 66-76页

作者： Lei Xue Tong shi Chenhui Han Heng Zhang Fenrong liu Haorun li Yan Wang Xiaojun Gu Shanghong Zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical Engineering Inner Mongolia University State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Institute of Catalysis Department of Chemistry Zhejiang University National Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare Earths

Conversion of CO2back to hydrocarbons is the most direct way of closing the“carbon cycle”,and its significance is further enlarged if this process is driven by renewable energies such as ***,precisely controlling the product selectivity towards hydrocarbons against the competitive hydrogen evolution remains challenging,especially for Cu-based ***,we report a novel defect engineering strategy,by which Cu-doping-induced oxygen vacancies on CeO2nanorods were effectively created,with adjustable vacancy/Cu *** resulting optimum catalyst shows up to 79% catalytic current density to hydrocarbons （excluding CO）,with 49% faradaic efficiency to *** and density functional theory unveil that the ratio between oxygen vacancy and Cu affects significantly the formation of*CHO and activation of H2O,which leads to the following deep hydrogenation to *** findings may spur new insights for designing and developing more controllable chemical process relevant to CO2utilization.

关键词： Nanorods

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

白及多糖抗矽肺大鼠肺纤维化活性研究

中药材 2016年第7期39卷 1638-1642页

作者：李浩宇史珍珍舒立峰王杰李美芽丁志山蒋福升浙江中医药大学浙江杭州310053 陕西省肿瘤医院陕西西安710061

目的:研究白及多糖抗二氧化硅诱导的实验性矽肺大鼠肺纤维化活性及其可能的分子机理。方法:水提醇沉、Sevage法除蛋白制备白及多糖;二氧化硅气管滴注法建立大鼠矽肺模型;通过检测大鼠肺指数及组织病理学变化,结合血清SOD、MDA、NF-κB、... 详细信息

目的:研究白及多糖抗二氧化硅诱导的实验性矽肺大鼠肺纤维化活性及其可能的分子机理。方法:水提醇沉、Sevage法除蛋白制备白及多糖;二氧化硅气管滴注法建立大鼠矽肺模型;通过检测大鼠肺指数及组织病理学变化,结合血清SOD、MDA、NF-κB、IL-1β、PDGF、TGF-β1、TNF-α、HYP含量变化,流式细胞术检测CD3^+、CD4^+、CD8^+T细胞百分含量及CD4^+/CD8^+比值,分析白及多糖药效及作用机理。结果:与模型组比较,白及多糖低(100mg/kg)、高(400 mg/kg)剂量组血清SOD活性显著升高,MDA、NO含量显著降低,CD4^+/CD8^+比值逆转(P<0.01)。除白及多糖高剂量能显著降低血清TNF-α含量外,白及多糖对矽肺大鼠血清炎症细胞因子及HYP水平均无明显影响。组织病理学检查显示,白及多糖未能有效改善肺组织纤维化程度。结论:白及多糖对矽肺大鼠机体抗氧化系统和免疫系统具有良好的调节作用,但不能有效抑制肺纤维化,白及中有效抑制肺纤维化活性组分有待进一步研究确证。

关键词：白及矽肺多糖抗氧化免疫调节

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

宾馆内空气中甲醛与温度的关系分析

山西化工 2010年第5期30卷 64-66页

作者：甄世利大同市环境监测站山西大同037006

按季度对室内甲醛进行监测,同步记录采样点温度。监测数据按季度进行统计分析,发现宾馆内甲醛释放浓度受温度影响显著(r=0.829),且二者年变化规律呈倒"V"型,峰值出现在第3季度;在一定的时间区间内,甲醛合格率年变化趋势呈正"V"型,第3季... 详细信息

按季度对室内甲醛进行监测,同步记录采样点温度。监测数据按季度进行统计分析,发现宾馆内甲醛释放浓度受温度影响显著(r=0.829),且二者年变化规律呈倒"V"型,峰值出现在第3季度;在一定的时间区间内,甲醛合格率年变化趋势呈正"V"型,第3季度甲醛合格率达到全年最低点,其与采样点温度之间呈极显著负相关(r=-0.941)。甲醛的释放具有很强的季节性,其释放周期应按年进行统计。

关键词：甲醛温度相关性室内空气

维普期刊数据库