检索结果-南通市图书馆

Revealing the Structure-Property Difference of Natural Rubber Prepared by Different Methods: Protein and Gel Content are Key Factors

引用

Chinese Journal of Polymer Science 2024年第4期42卷 457-467页

作者： Shao-Qi Huang Jun-Qi Zhang Yong Zhu Ling-Min Kong lu-sheng liao Fu-Quan Zhang Zheng-Tian Xie Jin-Rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China Hainan Provincial Key Laboratory of Natural Rubber Processing Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural SciencesZhanjiang524001China

Natural rubber (NR) is widely used in various fields including aerospace, military industry and transportation due to its superior elasticity and comprehensive mechanical properties. Nonetheless, the commercial NR prepared by different methods usually exhibits different mechanical properties, primarily due to variations in processing conditions during the conversion from latex to bulk rubber material. Consequently, this poses challenges in scientific research and industrial production of NR. In order to assess the properties of various commercially available NR and identify key structural and compositional components, this study systematically compares and analyzes four representative NR raw materials: air dried sheet (ADS), ribbed smoked sheets (RSS), constant viscidity NR (CV), and whole field latex rubber (WF). The investigation focuses on evaluating their static mechanical behavior, SIC behavior, wear resistance, and fatigue resistance. The findings indicate that protein and gel content exhibit a crucial influence on the NR properties. These constituents contribute to the formation of a high-crosslinking density region, generating a heterogeneous network structure within the rubber. This structure amplifies strains during deformation, leading to earlier and stronger strain-induced crystallization (SIC). Among the four commercial NR brands, RSS demonstrates superior overall mechanical and dynamic properties owing to its high protein and gel content. This study serves as a valuable reference for comprehending the differences in properties among various commercial NR, thereby offering guidance for the actual processing and selection of NR.

关键词： Natural rubber Processingmethod Protein Gel content Property

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

A Robust Self-healing Polyurethane Elastomer Enabled by Tuning the Molecular Mobility and Phase Morphology through Disulfide Bonds

引用

Chinese Journal of Polymer Science 2021年第10期39卷 1299-1309,I0007页

作者： Hai-Tao Wu Bi-Qiang Jin Hao Wang Wen-Qiang Wu Zhen-Xing Cao Zhao-Yang Yuan Yue Huang Wei-Hang Li Guang-Su Huang lu-sheng liao Jin-Rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineerngSichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Natural Rubber Processing Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural SciencesZhanjiang 524001China

Elastomers with outstanding strength,toughness and healing efficiency are highly promising for many emerging ***,it is still a challenge to integrate all these beneficial features in one ***,an asymmetric alicyclic structure adjacent to aromatic disulfide was tactfully introduced into the backbone of polyurethane(PU)***,such elastomer(PU-HPS)was fabricated by polycondensing polytetramethylene ether glycol(PTMEG),isophorone diisocyanate(IPDI)and p-hydroxydiphenyl disulfide(HPS)via one-pot *** molecular mobility and phase morphology of PU-HPS can be tuned by adjusting the HPS ***,the dynamic exchange of hydrogen and disulfide bonds in the hard segment domains can also be *** optimized sample manifests outstanding tensile strength(46.4 MPa),high toughness(109.1 MJ/m^(3)),high self-healing efficiency after fracture(90.3%),complete scratch recovery(100%)and good puncture ***,this work provides a facile strategy for developing robust self-healing polymers.

关键词： Self-healing Polyurethane Disulfide bonds Chain mobility Phase morphology

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

Variation of Soil Microbial Biomass and Enzyme Activities at Different Growth Stages of Rice (Oryza sativa)

引用

Rice science 2005年第4期12卷 283-288页

作者： ZENG lu-sheng liao Min CHEN Cheng-li HUANG Chang-yong Department of Resources Science College of Environmental and Resource Sciences Zhejiang University Hangzhou 310029 China

A pot experiment was conducted under submerged conditions with hybrid rice Zhenong 7 to study the variation in the soil microbial biomass carbon （Cmic）, soil microbial biomass nitrogen （Nmic）, soil respiration rate, soil microbial metabolic quotient, soil enzyme activities, chlorophyll content, proline content and peroxidase activity （POD） in rice leaf at different growth stages. The soil Cmic, Nmic and soil respiration rate significantly increased at the early stage and then declined during rice growth, but ascended slightly at maturity. However, soil metabolic quotient declined at all the stages. Soil urease activity increased at first and then decreased, while acid phosphatase and dehydrogenase activities descended before ascended and then descended again. Soil urease activity and acid phosphatase activity showed a peak value at the tillering stage about 30 days after rice transplanting, but the peak value of dehydrogenase activity emerged at about 50 days after rice transplanting and the three soil enzymatic activities were significantly different at the different developmental stages. As rice growing, chlorophyll content in rice leaf descended at the early stage then ascended and a peak value appeared at about the 70th after rice transplanting, after that declined drastically, while POD activity increased gradually, but proline content declined gradually. There was a slight relation between rice physiological indices and soil biochemical indices, which indicated that soil biochemical characteristics were affected significantly by rice growth in the interaction system of the rice. soil and microorganisms.

关键词： rice soil microbial biomass soil metabolic quotient soil enzyme activity chlorophyll proline peroxidase

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

Relationships Between Intensity Gradation and Evolution of Soil Erosion: A Case Study of Changting in Fujian Province, China

引用

Pedosphere 2012年第2期22卷 243-253页

作者： LIN Chen ZHOU sheng-lu WU Shao-Hua liao Fu-Qiang School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210093(China) State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) School of Geography and Environment Jiangxi Normal UniversityNanchang 330022(China)

Soil erosion gradation is a robust and objective quantitative indicator of soil erosion intensity. Recent applications of soil erosion gradation have focused on monitoring soil erosion with models or simulation of soil erosion through gradation trends. However, soil erosion simulation accuracy is generally being reduced due to the rare consideration of the relationship between soil erosion gradation and erosion evolution. In this study, we investigated different soil erosion intensity grades to demonstrate their sensitivity to types and rates of erosion. Specifically, the objective was to define the relationship between soil erosion gradation and soil erosion evolution in Changting, an undeveloped area in Fujian Province, China, for four time intervals (1975, 1990, 1999, and 2006). The time series of erosion gradation were developed by modeling analysis with integration of several erosion indicators, and the relationships between the erosion grades and evolution types and rates were quantified. Comparison of the collapsing forces with natural and restoring forces based on human activity demonstrated that there existed an obvious spatial uncertainty in the erosion evolution types, both positive and negative succession coexisted, and the evolution rates were mostly influenced by the force of policy orientation. The impacts of these driving forces were eventually reflected in the erosion intensity gradation and erosion evolution. The correlation between the negative succession rate and erosion intensity gradation was weak and showed a poor contribution to the average succession rate, while the negative correlation between the positive succession rate and erosion intensity gradation would be increasingly clear as time passed.

关键词： driving forces negative succession policy orientation positive succession time series

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

基于计算机视觉的机械运动分析

引用

物理实验 2016年第11期36卷 10-12页

作者：李炉锋廖生海孟宪嵩王国栋河海大学理学院江苏南京210098

利用Matlab的计算机视觉跟踪功能,以单摆的大角度运动为例,研究了机械运动的位移与时间的关系,并且直接给出阻尼等不易测量的参量,提高了实验的精度和准确性.

关键词：单摆机械运动视觉跟踪

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

Organic Near-Infrared luminescent Materials Based on Excited State Intramolecular Proton Transfer Process

引用

Chinese Journal of Chemistry 2022年第20期40卷 2468-2481页

作者： Zong-lu Che Chang-Cun Yan Xue-Dong Wang Liang-sheng liao Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhouJiangsu215123 China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa999078 Macao SARChina

Organic near-infrared(NIR)luminescent materials have captured intense research interest owing to their potential applications in optical communication,data storage,bioimaging,sensing and night *** state intramolecular proton transfer(ESIPT)process with absorption in normal form while emission in tautomer form can lead to a distinct redshift emission,based on which,a lot of organic NIR luminescent materials were *** of attractive features such as ultrahigh sensitivity to the surroundings,large Stokes shift,and inherent four level system,ESIPT based NIR luminescent materials are supposed to be ideal fluorescent probes and gain *** this review,first,organic near-infrared luminescent materials based on ESIPT process are summarized according to the core ***,recent advances of ESIPT-based organic near-infrared fluorescent probes and organic NIR lasers are ***,the current challenges and prospects of ESIPT-based organic NIR luminescent materials are introduced.

关键词： Exited-state intramolecular proton transfer Near-infrared emission luminescent Fluorescent probes Organic laser

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

Marker-assisted selection to pyramid Fusarium head blight resistance loci Fhb1 and Fhb2 in the high-quality soft wheat cultivar Yangmai 15

引用

Journal of Integrative Agriculture 2023年第2期22卷 360-370页

作者： HU Wen-jing FU lu-ping GAO De-rong LI Dong-sheng liao Sen lu Cheng-bin Key Laboratory of Wheat Biology and Genetic Improvement for Low&Middle Yangtze Valley Ministry of Agriculture and Rural AffairsLixiahe Institute of Agricultural SciencesYangzhou 225007P.R.China College of Agronomy&Center for Crop Genome Engineering Henan Agricultural UniversityZhengzhou 45002P.R.China Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College Yangzhou UniversityYangzhou 225009P.R.China Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009P.R.China College of Agriculture Yangtze UniversityJingzhou 434023P.R.China

Fusarium head blight(FHB)is one of the most detrimental wheat diseases which greatly decreases the yield and grain quality,especially in the middle and lower reaches of the Yangtze River of ***1 and Fhb2 are two major resistance loci against Fusarium *** 15(YM15)is one of the most popular varieties in the middle and lower reaches of the Yangtze River,and it has good weak gluten characters but poor resistance to *** we used Fhb1 and Fhb2 to improve the FHB resistance of YM15 by a molecular marker-assisted selection(MAS)backcrossing *** selection of agronomic traits was performed for each *** successfully selected seven introgressed lines which carry homozygous Fhb1 and Fhb2 with significantly higher FHB resistance than the recurrent parent *** of the introgressed lines had agronomic and quality characters that were similar to *** study demonstrates that the pyramiding of Fhb1 and Fhb2 could significantly improve the FHB resistance in wheat using the MAS approach.

关键词： Fusarium head blight marker-assisted selection Fhb1 Fhb2 resistance breeding wheat

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

Species identification of poisonous medicinal plant using DNA barcoding

引用

Chinese Journal of Natural Medicines 2019年第8期17卷 585-590页

作者： LIU Miao LI Xi-Wen liao Bao-sheng luO lu REN Yue-Ying College of Chinese Medicine Materials Jilin Agriculture University Changchun 130118 China Institute of Chinese Materia Medica Academy of Chinese Medical Sciences Beijing 100700 China

The aim is to select a universal DNA barcode for identifying all poisonous medicinal plants in Chinese pharmacopoeia and their poisonous related species or adulterants. We chose 4 commonly used regions as candidate DNA barcodes(ITS2, psb A-trn H,matK and rbc L) and compared their identification efficiency in 106 species from 27 families and 65 genera totally. Data analysis was performed including the information of sequence alignment, inter/intra-specific genetic distance and data distribution, identification efficiency and the situation of Neighbor-Joining(NJ) phylogenetic trees. We found ITS2 sequence region had high variation, stable genetic distance and identification efficiency relatively. The topological structure of NJ phylogenetic tree showed monophyletic. Our findings show that ITS2 can be applied as a universal barcode for identifying poisonous medicinal plants in Chinese pharmacopoeia and their poisonous related species or adulterants.

关键词： Sequence Poisonous herbal medicine Genetic distance DNA barcoding ITS2 Blast

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

Effect of cooling rate on the 3D morphology of the proeutectic Al3Ni intermetallic compound formed at the Al/Ni interface after solidification

引用

Journal of Materials Science & Technology 2021年第10期69卷 60-68页

作者： liao Yu Qiaodan Hu Zongye Ding Fan Yang Wenquan lu Naifang Zhang sheng Cao Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Materials The University of ManchesterOxford RoadManchesterMl 39PLUK

Effect of cooling rate on the 3 D morphology and the growth mechanism of the proeutectic Al3Ni intermetallic compound(IMC) that forms at the Al/Ni interface after solidification was investigated by synchrotron X-ray microtomography in combination with EBSD analysis. The proeutectic Al3Ni phase that forms under an average cooling rate of 0.1 Ks^(-1) shows a characteristic faceted growth behavior and presents a typical 3 D morphology as partially hollow quadrangular prisms. On the contrary, that forms under an average cooling rate of 10 Ks^(-1) shows complicated dendritic morphology with asymmetrically distributed arms and faceted V-shape groove at the distal end, indicating a gradual transition of the growth behavior from non-faceted to faceted during the solidification process. These results reveal that the morphology of the proeutectic Al3Ni is highly sensitive to the solidification condition so that fine control of the desired morphology may be achieved by carefully manipulating the cooling profile.

关键词： 3D morphology Al3Ni intermetallic compounds Solidification Cooling rate Synchrotron radiation Al/Ni interface

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

采用端口阻抗测试的车载充电机传导电磁干扰建模方法研究

引用

西安交通大学学报 2025年第1期59卷 172-182页

作者：李季风耿宇宇贾晋廖兴林路青洋重庆理工大学电气与电子工程学院重庆400054 重庆理工大学汽车零部件先进制造技术教育部重点实验室重庆400054

针对电动汽车车载充电机的设计过程中普遍存在的电磁干扰频率范围广、干扰源复杂的问题,提出了一种基于端口阻抗测试的等效电路建模和系统级协同仿真方法。首先,通过对车载充电机系统各部件进行阻抗测试和三维电磁仿真,建立了无源器件... 详细信息

针对电动汽车车载充电机的设计过程中普遍存在的电磁干扰频率范围广、干扰源复杂的问题,提出了一种基于端口阻抗测试的等效电路建模和系统级协同仿真方法。首先,通过对车载充电机系统各部件进行阻抗测试和三维电磁仿真,建立了无源器件、端口滤波器和高压屏蔽线缆模型,提取了系统印制电路板关键回路的高频寄生参数。其次,建立了有源器件的仿真电路模拟器等效模型,并通过双脉冲实验验证模型的精度;针对功率因数校正电路控制环节的仿真与建模难以同步实现的问题,采用协同建模的方法构建整个系统的等效电路模型。最后,将各部件模型组合在一起,建立了完整的车载充电机系统传导电磁干扰预测模型,并依据相关测试标准进行了系统传导电磁干扰仿真和实验。结果表明:在150 kHz~30 MHz频率范围内,预测结果与实际结果的误差小于9 dB,具有良好的一致性,表明该模型能够精确预测车载充电机系统高压交流端的传导干扰水平,可以有效指导充电机系统的电磁兼容正向设计。

关键词：车载充电机电磁干扰端口阻抗测试协同仿真

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：