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汽车内饰胶粘剂挥发性能研究

环境技术 2024年第7期42卷 131-135页

作者：宋景华张琛欣邵增杰孙俊雅吉利汽车研究院(宁波)有限公司宁波315300

本文选取汽车内饰常用的三类胶粘剂(水性胶、热熔胶和溶剂胶)为研究对象,应用瓶子法材料气味和热脱附-气相色谱质谱分析仪联合分析不同胶粘剂的挥发性能。研究结果表明,三种内饰胶粘剂的气味性能依次为水性胶、热熔胶、溶剂胶;不同类型... 详细信息

本文选取汽车内饰常用的三类胶粘剂(水性胶、热熔胶和溶剂胶)为研究对象,应用瓶子法材料气味和热脱附-气相色谱质谱分析仪联合分析不同胶粘剂的挥发性能。研究结果表明,三种内饰胶粘剂的气味性能依次为水性胶、热熔胶、溶剂胶;不同类型的胶粘剂含有不同的VOC挥发物质,对其气味影响最大的主要物质包括N,N-二甲基甲酰胺、三乙胺、2,6-二叔丁基苯酚、乙酸、2,6-二叔丁基对甲酚(BHT)和各种溶剂类物质。通过对胶粘剂挥发性能的研究,可以确定影响其挥发性能的关键物质,并为车内空气质量改善提供技术支持。

关键词：水性胶溶剂胶热熔胶气味 VOC

Constructing subtle grain boundaries on Au sheets for enhanced CO2 photoreduction

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Science China Chemistry 2020年第12期63卷 1705-1710页

作者： Xu Li Tingting Zheng Lan Zhang Songtao Zhao Yinuo Chen Miaojin Wei Chunyan Shang Jun Bao jie zeng Hefei National Laboratory for Physical Sciences at the Microscale National Synchrotron Radiation LaboratoryCAS Key Laboratory of Strongly-Coupled Quantum Matter PhysicsKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesDepartment of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China

Photocatalytic reduction of CO2 into value-added products is a promising strategy for mitigating environmental and energy problems ***,we developed Au sheets with subtle grain boundaries on ultrathin Ni(OH)2 nanosheets as efficient photocatalysts for CO2 *** to mechanistic studies,grain boundaries on the Au sheets served as electron trapping sites which enabled the optimization of electron-hole ***,grain boundaries perturbed electron distribution,which assisted in stabilizing CO2^δ- and HCOO^* *** a result,the unique hybrid structure achieved a high rate of 75.2μmol g^-1h^-1 for CO2 *** work demonstrates the importance of defect engineering in designing active photocatalysts and also provides insight into development of related photo-energy conversion schemes.

关键词： Au sheet grain boundary Ni(OH)2 nanosheet CO2 photoreduction

1097例大学生中医体质的潜在类别及其对自我效能感与抑郁焦虑关系的调节作用

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广州中医药大学学报 2024年第7期41卷 1653-1661页

作者：廖文娜罗向晗孙永鹏叶增杰广东开放大学广东广州510091 广州中医药大学广东广州510006 广州医科大学广东广州510182

【目的】分析大学生中医体质的潜在类别,探讨中医体质潜在类别对自我效能感与抑郁和焦虑症状关系的调节作用。【方法】采用30条目中医体质量表、一般自我效能感量表、凯斯勒心理困扰量表对广东省内2所高校的大学生开展调查,获得有效样本... 详细信息

【目的】分析大学生中医体质的潜在类别,探讨中医体质潜在类别对自我效能感与抑郁和焦虑症状关系的调节作用。【方法】采用30条目中医体质量表、一般自我效能感量表、凯斯勒心理困扰量表对广东省内2所高校的大学生开展调查,获得有效样本1 097例;采用相关分析、潜在剖面分析、层次回归分析等方法进行统计分析。【结果】(1)大学生中医体质可分为4个潜在类别:一般平和型(32.0%)、高度平和型(17.4%)、一般偏颇型(36.9%)和高度偏颇型(13.7%),且不同类别人群在中医体质各亚量表上的得分差异均有统计学意义(均P<0.001)。(2)层次回归分析显示,自我效能感负向预测抑郁和焦虑症状(β=-0.268、-0.161,P<0.001);以一般平和型为参照,一般偏颇型和高度偏颇型正向预测抑郁和焦虑症状,高度平和型负向预测抑郁和焦虑症状(均P<0.001)。(3)中医体质潜在类别在自我效能感与抑郁、焦虑症状间起调节作用:中医体质为一般偏颇型、高度偏颇型和一般平和型时,抑郁和焦虑症状随自我效能感的增高而减轻(均P<0.01);中医体质为高度平和型时,抑郁(β=0.005,P=0.907)和焦虑(β=0.007,P=0.878)症状不随自我效能感的增高而变化。【结论】大学生中医体质存在明显的群体异质性,应结合各类中医体质人群的特点,通过增强自我效能感和体质调理来促进大学生的心理健康。

关键词：大学生中医体质潜在类别抑郁焦虑自我效能感心理健康

Monitor of Polymerization of Inverse Microemulsions Containing Methyl Methacrylate and Acrylic Acid

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Chinese Chemical Letters 2006年第2期17卷 247-250页

作者： Xiao LI Sheng Ping XIA Wei jie zeng Wei Ying ZHANG Sheng Xiong DONG College of Chemistry and Chemical Engineering FuzhouUniversity Fuzhou350002

The polymerization of the inverse microemulsions composed of methyl methacrylate,acrylic acid, sodium dodecyl sulfate and water was monitored by refractometer, conductometer and time-resolved light scattering device. The results showed that refractive index, conductivity or intensity distribution of scattered light changed along with polymerization, and different processes of polymerization could be identified.

关键词： Polymerization monitoring inverse microemulsion methyl methacrylate.

Mesopause temperatures and relative densities at midlatitudes observed by the Mengcheng meteor radar

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Earth and Planetary Physics 2023年第6期7卷 665-674页

作者： Wen Yi XiangHui Xue MaoLin Lu jie zeng HaiLun Ye JianFei Wu Chong Wang TingDi Chen Chinese Academy of Sciences Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for the Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China

The atmospheric temperatures and densities in the mesosphere and lower thermosphere(MLT)region are essential for studying the dynamics and climate of the middle and upper *** this study,we present more than 9 years of mesopause temperatures and relative densities estimated by using ambipolar diffusion coefficient measurements observed by the Mengcheng meteor radar(33.4°N,116.5°E).The intercomparison between the meteor radar and Thermosphere Ionosphere Mesosphere Energetics and Dynamics/Sounding of the Atmosphere by Broadband Emission Radiometry(TIMED/SABER)and Earth Observing System(EOS)Aura/Microwave Limb Sounder(MLS)observations indicates that the meteor radar temperatures and densities agree well with the simultaneous satellite *** variations dominate the mesopause temperatures,with the maximum during winter and the minimum during *** mesopause relative densities also show annual variations,with strong maxima near the spring equinox and weak maxima before the winter solstice,and with a minimum during *** addition,the mesopause density exhibits a structure similar to that of the zonal wind:as the zonal wind flows eastward(westward),the mesopause density decreases(increases).At the same time,the meridional wind shows a structure similar to that of the mesopause temperature:as the meridional wind shows northward(southward)enhancements,the mesopause temperature increases(decreases).Simultaneous horizontal wind,temperature,and density observations provide multiple mesospheric parameters for investigating mesospheric dynamics and thermodynamic processes and have the potential to improve widely used empirical atmospheric models.

关键词： meteor radar mesopause horizontal wind temperature density

基于三节点逆元法与光纤传感器的机翼形态重构方法

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航空科学技术 2024年第5期35卷 101-109页

作者：岳应萍赵悦琦曾捷王志刚杨宇南京航空航天大学航空航天结构力学及控制全国重点实验室江苏南京210016 中国飞机强度研究所陕西西安710065

基于应变信息的飞机机翼结构形态重构技术,可为“仿生式机翼”的气动外形、气弹特性以及隐身性能控制提供数据支撑。为实现对飞机机翼的变形监测,本文提出一种基于三节点逆有限元法和应变信息采集的形态重构方法,并给出相应的光频域反... 详细信息

基于应变信息的飞机机翼结构形态重构技术,可为“仿生式机翼”的气动外形、气弹特性以及隐身性能控制提供数据支撑。为实现对飞机机翼的变形监测,本文提出一种基于三节点逆有限元法和应变信息采集的形态重构方法,并给出相应的光频域反射型分布式光纤传感器布局形式。首先,建立飞机机翼简化模型,开展基于有限元分析结果的形态重构方法仿真验证。其次,构建基于分布式光纤传感器的机翼简化模型应变监测与形态重构试验系统。研究表明,自然下垂工况下,机翼简化模型形态重构相对误差平均值约为4.01%;弯扭组合工况下,机翼简化模型形态重构相对误差平均值约为6.34%。本文所提方法适用于不同载荷工况下飞机机翼变形监测,能够为可变体机翼形态调控与机载共型天线相位补偿提供帮助。

关键词：逆有限元法机翼简化模型光频域反射型分布式光纤传感器形态重构

Radiolysis of HA in aqueous solutions using gamma rays

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Nuclear Science and Techniques 2013年第B12期24卷 48-52页

作者： JIA Wenbao WEI Yonghong LIU Jianguo LING Yongsheng HEI Daqian SHAN Qing zeng jie College of materials science and technology Nanjing University of Aeronautics and Astronautics Nanjing 211100 China Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

The present work investigated the radiolysis of HA (Humic acids) in aqueous solutions and under gamma radiation. Absorbances at the range of 200-800 nm and chemical oxygen demand (COD) were used to characterize the degree of degradation of HA. The results indicated that absorbances and the concentrations of COD were decreased with increasing of irradiation dose while with increasing of irradiation dose the pH of the solutions was decreased at first and then increase. In addition, the effects of initial pH and primary solution concentrations on HA degradation were also investigated. It is shown that the higher primary solution concentrations, the lower degradation efficiency under the same irradiation dose. And the degradation efficiency of HA under neutral conditions is better than in acidic or alkaline conditions. © 2013, Science Press. All rights reserved.

关键词：水溶液伽马射线降解程度溶液浓度辐照剂量化学需氧量照射剂量降解效率

视频作业在医学人文课程考核中的应用效果研究--以人际交往与医患沟通课程为例

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卫生职业教育 2024年第17期42卷 37-40页

作者：何思阳丽霞曾洁胡小花刘志航长沙医学院湖南长沙410000

在各医学院校开设的医学人文课程中,人际交往与医患沟通属于典型的医学与人文融合交叉课程。本研究以424名2019级医学类专业学生为调查对象,探讨视频作业在医学人文课程考核中的应用效果。研究表明,大部分学生具备制作视频的经验,视频... 详细信息

在各医学院校开设的医学人文课程中,人际交往与医患沟通属于典型的医学与人文融合交叉课程。本研究以424名2019级医学类专业学生为调查对象,探讨视频作业在医学人文课程考核中的应用效果。研究表明,大部分学生具备制作视频的经验,视频作业的考核形式能激发学生兴趣,落实教学目标,拓宽学生对短视频的认知边界,增进教师对学生的了解。

关键词：视频作业医学人文课程课程考核

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低糖蜜饯工艺探索

食品安全导刊 2024年第17期 122-124,173页

作者：李文秀李俊英曾洁黄婷刘丹内江职业技术学院四川内江641100

蜜饯是一种历史悠久的传统小吃,但目前市场上的蜜饯含糖量较高,随着人们对饮食健康越来越重视,高糖食品不适宜市场普及,因此想要扩大蜜饯的市场需求,低糖蜜饯的开发势在必得。本文综述了蜜饯常用的控制糖分含量的措施,包括选择渗透压更... 详细信息

蜜饯是一种历史悠久的传统小吃,但目前市场上的蜜饯含糖量较高,随着人们对饮食健康越来越重视,高糖食品不适宜市场普及,因此想要扩大蜜饯的市场需求,低糖蜜饯的开发势在必得。本文综述了蜜饯常用的控制糖分含量的措施,包括选择渗透压更高的单糖和功能性甜味剂代替部分蔗糖,选择合适的护色方式和浸糖工艺在保证品质的同时减少果实内部糖液渗入量,采用合适的沥糖方式减少蜜饯表面糖分残留等。但糖含量低可能会导致蜜饯的保质期短,因此可以从减低糖液渗入、用功能性糖代替常用的糖,以及干燥、防潮、包装等方面同时控制来实现低糖蜜饯的开发。

关键词：蜜饯低糖工艺