检索结果-南通市图书馆

Chinese Journal of Chemistry 2021年第12期39卷 3245-3254页

作者： Huizhi Yang Yufeng Bai Chunhua Ge shangyu li Xiangdong Zhang College of Chemistry Liaoning UniversityChongshan Road No.66ShenyangLiaoning 110036China

Polyethylene glycol(PEG)as phase change material(PCM)and carboxyl-rich carbon(RHTC)with different carboxyl content was introduced to prepare RHTC/PEG *** composites have high thermal conductivity,photothermal conversion ability,and improved the phase change enthalpy of the *** microstructure and thermal properties of the samples were analyzed by various characterization *** promoted the benign growth of PEG crystallinity(110.0%),influenced the phase change enthalpy of PEG,and improved the latent heat storage capacity of *** non-leakage loading of PEG in the composites can be as high as 97 wt%,and the actual phase change enthalpy is 10.7 J/g higher than that of pure PEG,10%higher than the theoretical *** to the heat storage bridge formed between PEG and RHTC,the thermal conductivity of the composites was up to 0.51 W/mK,which was 99.4%higher than that of ***,the introduction of environmentally friendly and low-cost RHTC gives the composites excellent photothermal conversion capability,and its photothermal conversion energy storage efficiency is as high as 90.1%.These results prove that the prepared composites are promising potential candidates in the field of thermal storage and thermal management systems.

关键词： Latent heat storage Carboxylation Renewable resources Photothermal conversion capacity Thermochemistry

Prediction of second-order rate constants between carbonate radical and organics by deep neural network combined with molecular fingerprints

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

Chinese Chemical Letters 2022年第1期33卷 438-441页

作者： Peizhe Sun Huixin Ma shangyu li Hong Yao Ruochun Zhang School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard Department of Municipal and Environmental EngineeringSchool of Civil EngineeringBeijing Jiaotong UniversityBeijing 100044China Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim Tianjin UniversityTianjin 300072China

Carbonate radical is among the most important environmental relevant reactive species which govern the transformation and fate of pharmaceutical contaminants(PCs).However,reaction rate constants between carbonate radical and most of the PCs have not been experimentally determined,and quantitative structural-activity relationships(QSARs)have not been established for rate *** study applied Max Min data processing method and used molecular fingerprints(MF)as the input of a deep neural network(DNN)to predict the rate constants between carbonate radical and organic *** parameters and the hyper-structure of the DNN were adjusted to yield satisfactory accuracy of rate *** vector length of 512 bits with radius of 1 for MF and 5 hidden layers gave the best *** optimized MaxMin-MF-DNN model was compared with some of the most commonly used QSARs and machine learning methods,including random data splitting,molecular descriptors,supporting vector machine,decision tree,*** showed that the MF-DNN model out-performed the other methods by more than 10%increase in prediction *** this MF-DNN model,we estimated reaction rates between carbonate radical and pharmaceuticals used in human medicine(1576)and veterinary practice(390).Among them,46 drugs were identified as fast-reacting compounds,suggesting the important relations of their environmental fate with carbonate radical.

关键词： Deep neural network Carbonate radical Molecular fingerprints QSAR Pharmaceuticals

Dynamic microwave-assisted extraction combined with liquid phase microextraction based on the solidification of a floating drop for the analysis of organochlorine pesticides in grains followed by GC

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2021年第3期10卷 375-382页

作者： Guijie li Xu Zhang Tingting liu Hongxiu Fan Hongcheng liu shangyu li Dawei Wang Lan Ding College of Food Science and Engineering Jilin Agricultural UniversityChangchun 130118China Jilin Province Product Quality Supervision and Inspection Institute Changchun 130103China College of Chemistry Jilin University2699 Qianjin StreetChangchun 130012China

A convenient,cost-effective and fast method using dynamic microwave-assisted extraction and liquid phase microextraction based on the solidification of a floating drop was proposed to analyze organochlorine pesticides in grains including rice,maize and *** samples can be processed simultaneously in the *** the extraction process,10%acetonitrile-water solutions containing 110μL of n-hexadecane were used to extract organochlorine ***,1.0 g sodium chloride was placed in the extract,and then centrifuged and *** n-hexadecane drops containing the analytes were solidifi ed and transferred for determination by gas chromatography-electron capture detector without any further filtration or cleaning *** of detection for organochlorine pesticides were 0.97–1.01μg/kg and the RSDs were in the range of 2.6%–8.5%.The developed technology has succeeded in analyzing six real grains samples and the recoveries of the organochlorine pesticides were 72.2%–94.3%.Compared with the published extraction methods,the developed method was used to analyze organochlorine pesticides in grains,being more environmentally friendly,which is suitable for the daily determination of organochlorine pesticides.

关键词： Dynamic microwave-assisted extraction liquid phase microextraction Gas chromatography Organochlorine pesticides Grain

呼吸与抒情的魔法——论柏桦诗歌中的声音、意象和故事

在线全文

学校读者我要写书评

暂无评论

扬子江文学评论 2020年第4期 94-102页

作者：李商雨安徽师范大学新闻与传播学院

就目前所能见到的研究诗人柏桦的文献里,几乎没有针对他的诗学、诗艺的研究。柏桦作为当代一位重要的诗人,同时,由于他的写作的独特性,有必要专文来讨论他的诗学和诗艺。在学术界和诗歌界,往往将柏桦视为第三代诗歌的代表性诗人,这个代... 详细信息

就目前所能见到的研究诗人柏桦的文献里,几乎没有针对他的诗学、诗艺的研究。柏桦作为当代一位重要的诗人,同时,由于他的写作的独特性,有必要专文来讨论他的诗学和诗艺。在学术界和诗歌界,往往将柏桦视为第三代诗歌的代表性诗人,这个代际定位,更像是一个僵硬、窄化和空洞的标签。也许对柏桦的诗歌写作实际情况作具体的讨论,比标签化更能理解这位诗人。

关键词：第三代诗歌柏桦诗歌界诗艺诗歌写作标签化独特性

论诗歌的日常生活感觉力——基于对韩东诗集《悲伤或永生》的诗学研究

在线全文

学校读者我要写书评

暂无评论

扬子江文学评论 2023年第6期 16-25页

作者：李商雨安徽师范大学新闻与传播学院

2022年7月,韩东出版了诗集《悲伤或永生》①,这部诗集所选诗歌跨度四十年,清楚地体现了韩东诗歌的总体风貌:从1980年代初到2021年,韩东的诗歌和诗学在根本上保持不变的前提下,经历了逐渐演进、逐渐丰富充实,并且其发力点逐渐清晰集中的... 详细信息

2022年7月,韩东出版了诗集《悲伤或永生》①,这部诗集所选诗歌跨度四十年,清楚地体现了韩东诗歌的总体风貌:从1980年代初到2021年,韩东的诗歌和诗学在根本上保持不变的前提下,经历了逐渐演进、逐渐丰富充实,并且其发力点逐渐清晰集中的发展过程。这个过程也表征了四十年来当代新诗“崭新传统”②逐步确立的轨迹。研究这部诗集的意义是双重的:它既是对韩东诗歌的诗学研究,也是通过韩东四十年的诗歌创作对当代诗歌的一种重要诗学演变路径进行梳理。

关键词：诗学研究当代新诗韩东当代诗歌总体风貌诗学演变诗歌创作永生

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

基于降质图像-光流场复原的智能轮椅测速

仪器仪表学报 2016年第11期37卷 2597-2605页

作者：李秀智徐传骆贾松敏李尚宇北京工业大学信息学部北京100124 计算智能与智能系统北京市重点实验室北京100124

提出一种运动图像去模糊复原和基于仿射运动模型的光流场去抖动方法,以提高智能轮椅中光流里程计测速方法的精度。当轮椅线速度或角速度较大时,导致机载相机成像产生显著的运动模糊;且轮椅机器人的机械抖动也易产生光流场的偏差,进而影... 详细信息

提出一种运动图像去模糊复原和基于仿射运动模型的光流场去抖动方法,以提高智能轮椅中光流里程计测速方法的精度。当轮椅线速度或角速度较大时,导致机载相机成像产生显著的运动模糊;且轮椅机器人的机械抖动也易产生光流场的偏差,进而影响速度估计的精度。针对于此,首先利用一种基于自适应模糊核的运动图像去模糊方法实现图像复原,以改善视频帧质量;其次,针对智能轮椅在行进中的机械抖动,利用随机抽样一致(RANSAC)排异后的光流场,在卡尔曼滤波框架下估计同名像点的仿射运动模型参数,进而实现光流补偿。实验结果表明所提方法能够提升基于光流场的智能轮椅视觉测速精度。

关键词：机器视觉速度测量光流图像复原仿射运动

在线全文

学校读者我要写书评

暂无评论

世上的雨

十月 2023年第2期 230-231页

作者：李商雨不详

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

实时的移动机器人语义地图构建系统

仪器仪表学报 2017年第11期38卷 2769-2778页

作者：李秀智李尚宇贾松敏单吉超北京工业大学信息学部北京100124 数字社区教育部工程研究中心北京100124

语义信息可以使机器人更充分地理解未知环境,为更高级的人机交互和完成更复杂的任务奠定基础。为了能够使移动机器人实时地创建语义地图,在Jetson TX1嵌入式电脑上开发了一种轻量级的深度学习目标检测模型,在保证了检测精度的同时,实现... 详细信息

语义信息可以使机器人更充分地理解未知环境,为更高级的人机交互和完成更复杂的任务奠定基础。为了能够使移动机器人实时地创建语义地图,在Jetson TX1嵌入式电脑上开发了一种轻量级的深度学习目标检测模型,在保证了检测精度的同时,实现了高效的目标检测功能。并利用了视频流中的帧间光流信息,使用运动信息指导传播算法降低检测算法的漏检率。对于Kinect传感器生成的深度图像有黑边、黑洞等缺陷,使用统一计算设备架构(CUDA)技术开发了一种实时的深度图像修复算法。利用即时定位与地图构建(SLAM)技术,实现移动机器人底层的定位、导航、地图创建功能,并在此基础上使用贝叶斯推理框架,同时融合了环境的度量信息与视觉识别信息完成了语义地图的创建。经过实验表明,所提出的方法在实际的、复杂的室内环境下可以使移动机器人实时地创建语义地图。

关键词：深度学习图像修复语义地图贝叶斯推理统一计算设备架构

Controllable CO adsorption determines ethylene and methane productions from CO_(2) electroreduction

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2021年第1期66卷 62-68,M0004页

作者： Haipeng Bai Tao Cheng shangyu li Zhenyu Zhou Hao Yang Jun li Miao Xie Jinyu Ye Yujin Ji Youyong li Zhiyou Zhou Shigang Sun Bo Zhang Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China Institute of Functional Nano&Soft Materials(FUNSOM)and Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Soochow UniversitySuzhou 215123China Institute of Chemical Sciences and Engineering École polytechnique fédérale de LausanneLausanne 1015Switzerland State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Among all CO2 electroreduction products,methane(CH4)and ethylene(C_(2)H_(4))are two typical and valuable hydrocarbon products which are formed in two different pathways:hydrogenation and dimerization reactions of the same CO *** studies show that the adsorption configurations of CO intermediate determine the reaction pathways towards CH4/C_(2)H_(4).However,it is challenging to experimentally control the CO adsorption configurations at the catalyst surface,and thus the hydrocarbon selectivity is still ***,we seek to synthesize two well-defined copper nanocatalysts with controllable surface *** two model catalysts exhibit a high hydrocarbon selectivity toward either CH4(83%)or C_(2)H_(4)(93%)under identical reduction *** transmission electron microscopy and X-ray absorption spectroscopy characterizations reveal the low-coordination Cu^(0)sites and local Cu^(0)/Cu^(+)sites of the two catalysts,***-temperature programed desorption,in-situ attenuated total reflection Fourier transform infrared spectroscopy and density functional theory studies unveil that the bridge-adsorbed CO(CO_(B))on the low-coordination Cu^(0)sites is apt to be hydrogenated to CH4,whereas the bridge-adsorbed CO plus linear-adsorbed CO(CO_(B)+CO_(L))on the local Cu^(0)/Cu^(+)sites are apt to be coupled to C_(2)H_(4).Our findings pave a new way to design catalysts with controllable CO adsorption configurations for high hydrocarbon product selectivity.

关键词： CO2 electroreduction CO adsorption Hydrogenation Dimerization

钢纤维混凝土焊钉-橡胶连接件受剪承载力试验研究

在线全文

学校读者我要写书评

暂无评论

建筑结构学报 2022年第2期43卷 207-214页

作者：刘世明王辰旭李晓克李尚宇赵顺波华北水利水电大学土木与交通学院河南郑州450045 华北水利水电大学河南省生态建材工程国家联合实验室河南郑州450045 长安大学旧桥检测与加固技术交通行业重点实验室陕西西安710064

为建立钢-混凝土组合结构桥梁使用的钢纤维混凝土(SFRC)焊钉-橡胶连接件受剪承载力设计计算方法,设计并制作了18组54个SFRC焊钉-橡胶连接件,通过单调加载与循环加载推出试验,研究了混凝土强度、焊钉直径、钢纤维体积掺量、橡胶套筒高度... 详细信息

为建立钢-混凝土组合结构桥梁使用的钢纤维混凝土(SFRC)焊钉-橡胶连接件受剪承载力设计计算方法,设计并制作了18组54个SFRC焊钉-橡胶连接件,通过单调加载与循环加载推出试验,研究了混凝土强度、焊钉直径、钢纤维体积掺量、橡胶套筒高度及厚度、加载模式等对其受剪承载力的影响规律。基于准牛顿法进行非线性拟合,提出了SFRC焊钉-橡胶连接件受剪承载力计算式。研究结果表明:焊钉-橡胶连接件受剪承载力随SFRC强度增大而增加,且增速呈变缓趋势;受剪承载力与焊钉杆截面面积大致呈线性增加关系,而随着橡胶套筒相对截面面积的增大而降低;钢纤维体积掺量不大于0.8%时,其对受剪承载力提升显著,随后增速变缓;加载模式对受剪承载力及破坏模式的影响不大;橡胶套筒可有效降低焊钉抗剪刚度并显著提高其变形性能。所提SFRC焊钉-橡胶连接件受剪承载力计算式可适用于SFRC强度等级CF30~CF60、焊钉直径13~25 mm、钢纤维体积掺量0~1.6%、橡胶套筒厚度不超过焊钉直径的1/2.6的SFRC焊钉-橡胶连接件设计。

关键词：组合结构桥梁焊钉-橡胶连接件钢纤维混凝土(SFRC) 推出试验受剪承载力