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PREPARATION OF POLYIMIDE-BaTiO3 HYBRID FILMS BY A DISPERSION PROCESS AND THEIR MICROSTRUCTURE

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Chinese Journal of Polymer Science 2001年第1期19卷 13-17页

作者： yue-sheng li yue-jin Tong Kai Jing Meng-xian ding State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Barium titanate (BaTiO3) powders with particle sizes of 30 similar to 50 nm were prepared from barium stearate, titanium alkoxides and stearic acid by stearic acid-gel method. Dispersing the agglomerate of BaTiO3 nanoparticles into poly(amic acid) solution followed by curing led to the formation of polyimide hybrid films. The hybrid films were transparent and well distributed with BaTiO3 nanoparticles when the BaTiO3 content was less than 1 wt%. Highly loaded hybrid film containing 30 wit % BaTiO3 was tough, had a smooth surface and possessed much higher dielectric and piezoelectric constants than the parent polyimide.

关键词： polyimide barium titanate nanocomposite hybrid film

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不同频率电刺激促进周围神经损伤的恢复

中国组织工程研究 2025年第14期29卷 3061-3069页

作者：刘敏琦高明威褚晓蕾邢政李世浩丁宁李亚杰李奇天津体育学院运动健康学院天津市301617 天津大学天津医院康复医学科天津市300211

背景:电刺激是治疗周围神经损伤有效的治疗方案,但不同频率电刺激促进周围神经恢复的机制和应用不同。目的:旨在系统梳理和总结不同频率电刺激在周围神经损伤治疗中的作用和应用,深入分析各种方法的优缺点,以期找到最有利于患者神经恢... 详细信息

背景:电刺激是治疗周围神经损伤有效的治疗方案,但不同频率电刺激促进周围神经恢复的机制和应用不同。目的:旨在系统梳理和总结不同频率电刺激在周围神经损伤治疗中的作用和应用,深入分析各种方法的优缺点,以期找到最有利于患者神经恢复的治疗策略。方法:应用计算机检索中国知网、PubMed数据库自建库至2024年5月期间的相关文献,英文检索词为“peripheral nerve injury,electrical stimulation,low frequency electrical stimulation,medium frequency electrical stimulation,high frequency electrical stimulation,TENS,interfering electricity,short wave,ultrashort wave,frequency”,中文检索词为“周围神经损伤,电刺激,低频电刺激,中频电刺激,高频电刺激,干扰电疗法,短波,超短波,频率,周围神经再生”,最终纳入74篇文献进行分析。结果与结论:周围神经损伤作为临床中常见的疾病,会引起患者感觉与运动功能障碍。低频电刺激能够促进电刺激后细胞增殖并加速细胞内神经生长因子表达,促进巨噬细胞募集和浸润,加速髓磷脂碎片的清除,促进受损轴突的髓鞘再生。中频电刺激能够作用于更深部位组织,对于缓解神经性疼痛方面更佳。高频电刺激能够促进施万细胞和巨噬细胞增殖并抑制炎性因子,更快募集到神经损伤部位,加快神经修复的速度。不同频率的电刺激在周围神经损伤恢复中各具优点,但是仍存在一些问题,例如电刺激的部位以及应对各种疾病类型的方案不同等。

关键词：周围神经损伤电刺激频率低频电刺激神经再生周围神经

Biomarker assessments of sources and environmental implications of organic matter in sediments from potential cold seep areas of the northeastern South China Sea

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Acta Oceanologica Sinica 2017年第10期36卷 8-19页

作者： ding ling ZHAO Meixun YU Meng li li HUANG Chi-yue Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China) Ministry of Education Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Department of Earth Sciences National Cheng Kung University

Multi-biomarker indexes were analyzed for two piston cores from potential cold seep areas of the South China Sea off southwestern Taiwan. Total organic carbon（TOC） normalized terrestrial（n-alkanes） and marine（brassicasterol, dinosterol, alkenones and iso-GDGTs） biomarker contents and ratios（TMBR, 1/Pmar-aq, BIT） were used to evaluate the contributions of terrestrial and marine organic matter（TOM and MOM respectively） to the sedimentary organic matter, indicating that MOM dominated the organic sources in Core MD052911 and the sedimentary organic matter in Core ORI-_（86）0-22 was mainly derived from terrestrial inputs, and different morphologies were the likely reason for TOM percentage differences. BIT results suggested that river-transported terrestrial soil organic matter was not a major source of TOM of sedimentary organic matter around these *** biomarkers for methane-oxidizing archaea（MOA） were only detected in one sample at 172 cm depth of Core ORI-_（86）0-22, with abnormally high iso-GDGTs content and Methane Index（MI） value（0.94）. These results indicated high anaerobic oxidation of methane（AOM） activities at or around 172 cm in Core ORI-_（86）*** in Core MD052911, MOA biomarkers were not detected and MI values were lower（0.19–0.38）, indicated insignificant contributions of iso-GDGTs from methanotrophic archaea and the absence of significant AOM activities. Biomarker results thus indicated that the discontinuous upward methane seepage and insufficient methane flux could not induce high AOM activities in our sampling sites. In addition, the different patterns of TEX_（86） and U_（37）^（K′） temperature in two cores suggested that AOM activities affected TEX_（86）37 temperature estimates with lower values in Core ORI-_（86）0-22, but not significantly on TEX_（86） temperature estimates in Core MD052911.

关键词： biomarkers organic matter sources TOM MOM anaerobic oxidation of methane South China Sea

Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 384-390页

作者： Xin-guo Si Xiong-gang Lu Chuan-wei li chong-he li Wei-zhong ding Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China Hebei Iron and Steel Group Tangshan Steel Company Tangshan 063020 China

The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200℃. The microstructure and phase transition of the reduction products were studied by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and optical microscopy （OM）. It was found that the weight loss and iron metallization rate increased with the increase of reduction temperature and reaction time. The iron metallization rate could reach 87.5% when the sample was reduced at 1150℃ for 80 min. The final phase constituents mainly consist of Fe, M305 solid solution phase （M=Mg, Ti, and Fe）, and few titanium oxide. Microstructure analysis shows that the surfaces of the reduction products have many holes and cracks and the reactions take place from the exterior of the grain to its interior. The kinetics of reduction indicates that the rate-controlling step is diffusion process control with the activation energy of 89 ***1-1.

关键词： ilmenite phase transformations kinetics hydrogen reduction metallization

Characteristics of leaching of heavy metals from low-sulfur coal gangue under different conditions

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International Journal of Coal Science & Technology 2021年第4期8卷 780-789页

作者： Chang li liugen Zheng Chunlu Jiang xing Chen Shuaishuai ding School of Resources and Environmental Engineering Anhui University111 Jiulong RoadHefei 230601AnhuiChina Anhui Mining Ecological Remediation Engineering Laboratory Hefei 230601AnhuiChina

Coal gangue is the main pollution source of mining *** coal gangue is stacked and recycled,the heavy metal elements contained in it are released by natural weathering and leaching,which causes damage to the surrounding ecological *** this study,the leaching and precipitation characteristics of heavy metals in low-sulfur coal gangue under different environmental conditions were simulated by indoor dynamic leaching experiments,which provided a theoretical basis for environmental restoration of the mining *** conclusions are as follows:higher heavy metal content in low-sulfur coal gangue is associated with greater,leaching of heavy metals;acidic conditions promote the release of heavy metals in low-sulfur coal gangue;and more precipitation is associated with better release of heavy metals from the low-sulfur coal gangue.

关键词： Coal gangue Leaching Heavy metal Leaching rate

Effects of combustion temperature on the optical properties of brown carbon from biomass burning

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Journal of Environmental Sciences 2024年第3期137卷 302-309页

作者： Peng Gao Rule Deng Song Jia yue li Xuefei Wang Qian xing School of Chemistry Sciences University of Chinese Academy of SciencesBeijing 100049China College of Chemistry and Materials Engineering Beijing Technology and Business UniversityBeijing 100048China

Biomass burning has been known as one of main sources of Brown Carbon(BrC)in *** this study,by controlling the combustion temperature at 250℃,350℃,and 450℃,the methanol soluble organic carbon(MSOC)and methanol insoluble carbon(MISC)from pine wood burning was collected by ***–Vis,excitation emission matrix(EEM),TEM and FTIR spectra were applied to investigate the properties of BrC *** MSOC at 250℃ and 350℃,all the spectral profiles of UV–Vis absorption and excitation emission matrix are almost the same,while the EEM of MSOC at 450℃ are different from that of the other *** MISC fuorescence was observed only in the case of 450℃.In the FTIR spectra,with the temperature increasing the peaks associated to the oxygen-contained functions was weakened,indicating the formation of the fuorophores with larger conjugated system,especially aromatic *** results show that biomass combustion at low temperature produces more oxygen-riched BrC,which possesses relatively lower light absorption,while at high temperature produces more aromatics hydrocarbons with relatively strong light *** results of this work are helpful to trace the source of brown carbon and optimize biomass energy utilization.

关键词： Biomass burning Combustion temperature Methanol-soluble brown carbon EEM Impinger

Effect of Water Absorption on the Mechanical Property and Failure Mechanism of Hollow Glass Microspheres Composite Epoxy Resin Solid Buoyancy Materials

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China Ocean Engineering 2023年第5期37卷 876-884页

作者： ding yue ZHAI Gang-jun MA Zhe WEI Zi-hao li Xin State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China

To study the water absorption of hollow glass microspheres(HGMs)composite epoxy resin solid buoyancy materials in the marine environment and its effect on the mechanical properties,the water absorption was measured by immersing the material in distilled water for 36 days at ambient temperature and fitted to Fick’s second *** strength of materials before and after water absorption were tested by uniaxial experiments,and the effects of the filling ratio and water absorption on the mechanical properties of the materials were analyzed and ***,the failure modes and mechanism of the hollow glass microspheres composite material were explicated from the microscopic level by scanning electron microscope(SEM).This research will help solve the problems of solid buoyancy materials in ocean engineering applications.

关键词： solid buoyancy material water absorption mechanical property failure mechanism scanning electron microscope

Leaky Modes in Ag Nanowire over Substrate Configuration

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Chinese Physics Letters 2017年第9期34卷 58-61页

作者： Yin-xing ding Lu-Lu Wang li Yu State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Belting 100876 School of Science Beijing University of Posts and Telecommunications Beijing 100876

By launching surface plasmons propagating along the Ag nanowire deposited on a substrate, we clearly observe three leaky modes using the Fourier imaging method. The effective refractive indexes, propagation lengths and electric field distributions of the modes are investigated, which indicate that the energy of the mode with a lowest effective refractive index is mainly distributed in the air, while for the other two modes, it is mainly distributed in the substrate and in the gap between the Ag nanowire and the substrate. These modes enable such a configuration to be used as a multichannel waveguide or highly directional optical antenna, which is of fundamental importance for optical device miniaturizations and photonic circuit integrations.

关键词： Surface plasmons

Adipose tissue autophagy and homeostasis in alcohol-induced liver injury

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liver Research 2017年第1期1卷 54-62页

作者： Yuan li Wen-xing ding Department of Pharmacology Toxicology and TherapeuticsThe University of Kansas Medical CenterKansas CityKSUSA

Alcohol consumption leads to injury in multiple organs and systems,including the liver,brain,heart,skeletal muscle,pancreas,bone,immune system,and endocrine *** evidence indicates that alcohol also promotes adipose tissue dysfunction,which may contribute to injury progression in other organs and *** is a lysosomal degradation pathway that has been shown to regulate adipose tissue homeostasis and *** evidence also demonstrates that alcohol consumption affects autophagy in multiple *** review summarizes current knowledge regarding the effect of autophagy on adipose tissue and its potential roles in alcohol-induced adipose tissue atrophy as well as its contribution to alcohol-induced liver injury.

关键词： Autophagy Alcohol Adipose tissue liver Alcoholic liver disease