检索结果-南通市图书馆

Multilayer two-dimensional lignin/ZnO composites with excellent anti-UV aging properties for polymer films

Green Chemical Engineering 2022年第4期3卷 338-348页

作者： Lizhu Zhang Yuanyuan Wang dongjie yang Huan Wang Weifeng Liu Zhixian Li School of Chemistry and Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyGuangdong Provincial Engineering Research Center for Green Fine ChemicalsSouth China University of TechnologyGuangzhou510640China Guangzhou Key Laboratory of Sensing Materials and Devices Centre for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China

Lignin is a kind of natural green polymer with abundant active functional groups and designable molecular structure.In this work,the quaternized lignosulfonate(QLS)with amphoteric characteristic was prepared through chemical modification using lignosulfonate sodium(LS).Then,a lignin-confined multilayered two-dimensional composite(QLS/ZnO)was prepared by one-step dynamic hydrothermal method using QLS,zinc nitrate,and hexamethylenetetramine.The QLS/ZnO has a regular pie-shaped structure,which is composed of 3-5 layers of two-dimensional nanosheets with a thickness of~10 nm.It shows excellent ultraviolet light absorption performance and active photoelectron scavenging performance,and thus showing great application potential in polymer materials.The water polyurethane(WPU)and polyvinyl alcohol(PVA)films showed excellent UV shielding performance and good mechanical properties when doped with the QLS/ZnO.The tensile strength of WPU t 0.6 wt%QLS/ZnO and PVA t 0.8 wt%QLS/ZnO composite films is increased by 49%and 24%,respectively,and the elongation at break is increased by 138%and 33%.Furthermore,the composite films showed excellent anti-UV aging resistance after being aged under strong UV irradiation for 14 days.This work is of great significance to the high-value application of industrial lignin in the field of nano-functional materials.

关键词： Lignin ZnO Composites Polyurethane Anti-UV aging

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lignin-based materials for electrochemical energy storage devices

引用

Nano Materials Science 2023年第2期5卷 141-160页

作者： Huan Wang Fangbao Fu Ming Huang Yunhui Feng Dongxue Han Yuebin Xi Wenlong Xiong dongjie yang Li Niu Guangzhou Key Laboratory of Sensing Materials&Devices School of Chemistry and Chemical EngineeringCollege of Physical EducationGuangzhou UniversityGuangzhouChina School of Chemistry and Chemical Engineering Guangdong Provincial Engineering Research Center for Green Fine ChemicalsSouth China University of TechnologyGuangzhou510640China School of Chemical and Biomedical Engineering Nanyang Technological University70 Nanyang Drive637457Singapore Key Laboratory of Pulp and Paper Science&Technology of Ministry of Education State Key Laboratory of Biobased Material and Green PapermakingQilu University of Technology(Shandong Academy of Sciences)Jinan250353China School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China

Lignin is the most abundant aromatic polymer in nature,which is rich in a large number of benzene ring structures and active functional groups.The molecular structure of lignin has unique designability and controllability,and is a class of functional materials with great application prospects in energy storage and conversion.Here,this review firstly focuses on the concept,classification,and physicochemical property of lignin.Then,the application research of lignin in the field of electrochemical storage materials and devices are summarized,such as lignin-carbon materials and lignin-carbon composites in supercapacitors and secondary batteries.Finally,this review points out the bottlenecks that need to be solved urgently and the prospects for future research priorities.

关键词： Lignin Electrochemical storage Lignin-based carbon Supercapacitors Secondary batteries

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simultaneous determination of typical toxic aldehydes formed during food frying and digestion using isotope dilution UHPLC-QqQ-MS/MS

引用

Grain & Oil Science and Technology 2024年第1期7卷 42-49页

作者： Feng Wang Yun Cui dongjie Liu Charles Brennan Soottawat Benjakul Weiwei Cheng Gengsheng Xiao Lukai Ma Key Laboratory of Green Processing and Intelligent Manufacturing of Lingnan Specialty Food of Ministry and Rural Affairs College of Light Industry and FoodZhongkai University of Agriculture and EngineeringGuangzhou 510225China School of Science Royal Melbourne Institute of Technology UniversityMelbourneAustralia International Center of Excellence in Seafood Science and Innovation Faculty of Agro-IndustryPrince of Songkla UniversitySongkhla 90110Thailand College of Food Science and Technology Zhejiang University of TechnologyHangzhou 310014China

An isotope dilution ultra-performance liquid chromatography-triple quadrupole mass spectrometry method was developed to simultaneously detect two typical kinds ofα,β-unsaturated aldehydes,namely 4-hydroxy-2-hexenal(4-HHE)and 4-hydroxy-2-nonenal(4-HNE),in foods.The proposed method exhibited a linear range of 10-1000 ng/mL with a limit of detection of 0.1-2.0 ng/g and a limit of quantification of 0.3-5.0 ng/g.The recovery rates of these typical toxic aldehydes(i.e.,4-HHE,4-HNE)and their d3-labeled analogues were 91.54%-105.12%with a low matrix effect.Furthermore,this proposed method was successfully applied to a real frying system and a simulated digestion system,wherein the contents of 4-HHE and 4-HNE were determined for both.Overall,the obtained results provide strong support for further research into the production of 4-HHE and 4-HNE resulting from foods during oil digestion and frying.

关键词： UHPLC-QqQ-MS/MS 4-Hydroxy-2-hexenal 4-Hydroxy-2-nonenal Frying Simulated digestion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Drivers,Trends,and Patterns of Changing Vegetation-greenness in Nansha Islands,China from 2016 to 2022

引用

Chinese Geographical Science 2024年第4期34卷 662-673页

作者： TANG Jiasheng FU dongjie SU Fenzhen YU Hao WANG Xinhui Faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou 730070China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Collaborative Innovation Center of South China Sea Studies Nanjing 210023China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Beijing North-Star Technology Development Co. LtdBeijing 100120China

Changes in vegetation status generally also represents changes in the ecological health of islands and reefs(IRs).However,studies are limited of drivers and trends of vegetation change of Nansha Islands,China and how they relate to climate change and human activities.To resolve this limitation,we studied changes to the Normalized Difference Vegetation Index(NDVI)vegetation-greenness index for 22 IRs of Nansha Islands during normal and extreme conditions.Trends of vegetation greenness were analyzed using Sen's slope and Mann-Kendall test at two spatial scales(pixel and island),and driving factor analyses were performed by time-lagged partial correlation analyses.These were related to impacts from human activities and climatic factors under normal(temperature,precipitation,radiation,and Normalized Difference Built-up Index(NDBI))and extreme conditions(wind speed and latitude of IRs)from 2016 to 2022.Results showed:1)among the 22 IRs,NDVI increased/decreased significantly in 15/4 IRs,respectively.Huayang Reef had the highest NDVI change-rate(0.48%/mon),and Zhongye Island had the lowest(–0.29%/mon).Local spatial patterns were in one of two forms:dotted-form,and degradation in banded-form.2)Under normal conditions,human activities(characterized by NDBI)had higher impacts on vegetation-greenness than other factors.3)Under extreme conditions,wind speed(R^(2)=0.2337,P<0.05)and latitude(R^(2)=0.2769,P<0.05)provided limited explanation for changes from typhoon events.Our results provide scientific support for the sustainable development of Nansha Islands and the United Nations‘Ocean Decade’initiative.

关键词： island and reefs(IRs) Normalized Difference Vegetation Index(NDVI) vegetation-greenness change-rate Sen's slope Nansha Islands China

来源：

维普期刊数据库

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

Preparation of lignin/TiO2 nanocomposites and their application in aqueous polyurethane coatings

引用

Frontiers of Chemical Science and Engineering 2019年第1期13卷 59-69,F0004页

作者： dongjie yang Shengyu Wang Ruisheng Zhong Weifeng Liu Xueqing Qiu School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 China

A simple method using a water soluble lignin quaternary ammonium salt (LQAS) and TiO2 has been developed for the preparation of lignin/TiO2 nanocomposites in an aqueous medium under mild conditions. The LQAS/TiO2 nanocomposites contain well-dispersed small particles with excellent ultraviolet (UV) shielding abilities and good compatibilities with waterborne polyurethane (WPU). When the LQAS/TiO2 nanocomposites were blended with WPU, the UV absorbance and the tensile ductility of the WPU increased significantly. The composite WPU hybrid film containing 6 wt-% LQAS/TiO2 nanocomposite had the highest visible light transmittance and had excellent ultraviolet aging properties. After 192 h of UV light irradiation, the tensile strength of the composite film was above 8 MPa and the elongation at break was 800%. This work highlights new possibilities for the utilization of alkali lignin.

关键词： lignin TiO2 nanocomposite particle polyurethane film

来源：

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

Atomic Force Microscopy Measurement in the Lignosulfonate/Inorganic Silica System:From Dispersion Mechanism Study to Product Design

引用

Engineering 2021年第8期7卷 1140-1148页

作者： Jingyu Wang Yong Qian Yijie Zhou dongjie yang Xueqing Qiu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

Designing and preparing high-performance lignin-based dispersants are crucial steps in realizing the value-added utilization of lignin on an industrial scale.Such process depends heavily on an understanding of the dispersion mechanism of lignin-based dispersants.Here,atomic force microscopy(AFM)is employed to quantitatively investigate the dispersion mechanism of a lignosulfonate/silica(LS/SiO_(2))system under different pH conditions.The results show that the repulsive force between SiO_(2)particles in LS solution is stronger than it is in water,resulting in better dispersion stability.The Derjaguin–Landau–Verwey–Overbeek(DLVO)formula as well as the DLVO formula combined with steric repulsion is utilized for the fitting of the AFM force/distance(F/D)curves between the SiO_(2)probe and substrate in water and in LS solution.Based on these fitting results,electrostatic and steric repulsive forces are respectively calculated,yielding further evidence that LS provides strong steric repulsion between SiO_(2)particles.Further studies indicate that the adsorbance of LS on SiO_(2)(Q),the normalized interaction constant(A),and the characteristic length(L)are the three critical factors affecting steric repulsion in the LS/SiO_(2)system.Based on the above conclusions,a novel quaternized grafted-sulfonation lignin(QAGSL)dispersant is designed and prepared.The QAGSL dispersant exhibits good dispersing performance for SiO_(2)and real cement particles.This work provides a fundamental and quantitative understanding of the dispersion mechanism in the LS/inorganic particle system and provides important guidance for the development of high-performance lignin-based dispersants.

关键词： Lignin Silica Atomic force microscopy Dispersion mechanism Product design

来源：

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

数字技术进步如何影响我国就业技能结构--基于省级面板数据的研究

引用

安徽师范大学学报（社会科学版） 2024年第1期52卷 121-135页

作者：郭东杰吴明烨浙江工业大学经济贸易管理学院杭州310014

本文通过构建2010—2020年省级面板数据,针对数字技术进步与我国就业技能结构之间的关系展开实证研究,分析了消费互联网和工业互联网两类技术对就业技能结构的影响及其作用机制。研究结果表明:(1)从全国层面来看,消费互联网和工业互联... 详细信息

本文通过构建2010—2020年省级面板数据,针对数字技术进步与我国就业技能结构之间的关系展开实证研究,分析了消费互联网和工业互联网两类技术对就业技能结构的影响及其作用机制。研究结果表明:(1)从全国层面来看,消费互联网和工业互联网发展均提升中高技能就业人数占比,降低低技能就业人数占比,数字技术进步总体上促进了我国就业技能结构升级。(2)从影响程度来看,工业互联网发展对就业结构升级的促进作用明显高于消费互联网。(3)从影响方式来看,工业互联网主要通过提升高技能劳动者相对薪资水平促进就业结构升级;而消费互联网在提升高技能溢价的同时也增加中等技能劳动者的相对薪资水平,同时通过提升地区生活成本挤出低技能劳动力。(4)从影响范围来看,消费互联网发展推动就业技能结构升级的影响范围更广,而工业互联网发展的就业技能结构升级作用则集中于中、西部地区。结论的政策含义是,应当持续推进数字技术进步,重视工业互联网技术对就业结构升级的基础作用,同时充分发挥消费互联网的岗位创造作用,各地区在发展数字经济时应注意不同类型数字技术对地区人力资本水平提升效果上的差异,同时加强区域间数字经济一体化建设。

关键词：数字技术进步就业技能结构消费互联网工业互联网

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于知识矩阵推理的小型模块化反应堆并发故障诊断方法研究

引用

核动力工程 2024年第3期45卷 170-173页

作者：彭俏马杰刘明辉绳东杰海军工程大学核科学技术学院武汉430033

针对小型模块化反应堆(SMR)并发故障诊断问题,提出了一种基于知识矩阵进行知识表达和推理的并发故障诊断方法,该方法给出了一种高效的专家知识表达方式,将传统专家系统复杂的逻辑推理转换为简捷的矩阵运算,提高了故障诊断效率,可满足SM... 详细信息

针对小型模块化反应堆(SMR)并发故障诊断问题,提出了一种基于知识矩阵进行知识表达和推理的并发故障诊断方法,该方法给出了一种高效的专家知识表达方式,将传统专家系统复杂的逻辑推理转换为简捷的矩阵运算,提高了故障诊断效率,可满足SMR在线并发故障诊断的要求,并以SMR发生主冷却剂管路破损和控制棒掉棒并发故障为诊断示例证明了本方法的有效性。

关键词：小型模块化反应堆(SMR) 并发故障诊断知识矩阵推理

来源：

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

伏立康唑与奈玛特韦/利托那韦联用致肝损伤

引用

药物不良反应杂志 2024年第2期26卷 123-125页

作者：郭冬杰李朋梅中日友好医院药学部北京100029

1例66岁男性肺移植术后患者,长期服用他克莫司、麦考酚钠、泼尼松三联药物抗排斥反应。因患者发生新型冠状病毒和肺部真菌感染,给予奈玛特韦/利托那韦(Paxlovid)抗病毒治疗,2 d后加用伏立康唑抗真菌治疗。加用伏立康唑前患者丙氨酸转氨... 详细信息

1例66岁男性肺移植术后患者,长期服用他克莫司、麦考酚钠、泼尼松三联药物抗排斥反应。因患者发生新型冠状病毒和肺部真菌感染,给予奈玛特韦/利托那韦(Paxlovid)抗病毒治疗,2 d后加用伏立康唑抗真菌治疗。加用伏立康唑前患者丙氨酸转氨酶34 U/L,天冬氨酸转氨酶28 U/L。伏立康唑与Paxlovid联用第4天,伏立康唑血药谷浓度16.06 mg/L,丙氨酸转氨酶176 U/L,天冬氨酸转氨酶166 U/L,立即停用伏立康唑,2 d后停用Paxlovid。伏立康唑停药5 d后,患者肝功能恢复正常;9 d后,其血药谷浓度为5.84 mg/L。考虑患者的肝损伤是伏立康唑与Paxlovid联用所致。

关键词：抗病毒药抗真菌药化学及药物性肝损伤伏立康唑药物相互作用肺移植利托那韦奈玛特韦

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

铁路站城融合发展路径与机制创新——以杭州西站为例

引用

建筑学报 2024年第5期 23-29页

作者：陈东杰郦仲华高松中国国家铁路集团有限公司工程设计鉴定中心北京100084 杭州市交通投资集团有限公司杭州310000 中国铁路上海局集团有限公司上海200071

阐述中国铁路站城融合发展历程,并以杭州西站为例,从城市定位、铁路规划与建筑设计等方面研究站城融合实现路径,探索三方协同、整体设计、分类开发、分层确权、造价控制和专业团队等设计创新与机制突破,以在我国现实背景下促进站城融合... 详细信息

阐述中国铁路站城融合发展历程,并以杭州西站为例,从城市定位、铁路规划与建筑设计等方面研究站城融合实现路径,探索三方协同、整体设计、分类开发、分层确权、造价控制和专业团队等设计创新与机制突破,以在我国现实背景下促进站城融合高质量发展。

关键词：站城融合设计创新机制突破杭州西站

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：