检索结果-南通市图书馆

Chinese Chemical Letters 2014年第9期25卷 1275-1278页

作者： An-Qi Ju meng-juan li Miao Luo Ming-Qiao Ge Key Laboratory of Eco-textiles Ministry of EducationJiangnan University College of Textile & Clothing Jiangnan University School of Pharmacy East China University of Science and Technology

In order to improve the stabilization and spinnability of polyacrylonitrile, a bifunctional comonomer containing both ester and amide groups was synthesized to prepare poly（acrylonitrile-co-3- aminocarbonyl-3-butenoic acid methyl ester） [P（AN-co-ABM）] copolymers used as the carbon fiber precursor instead of poly（acrylonitrile-acrylamide-methyl acrylate） [P（AN-AM-MA）] terpolymer. The differential scanning calorimetry and thermogravimetry results show that the stabilization of P（AN-co- ABM） have been remarkably improved by ABM compared with P（AN-AM-MA） terpolymer, such as lower initiation temperature, broadened exothermic peak and smaller activation energy. Moreover, the spinnability of P（AN-co-ABM） is also improved by ABM due to the lubrication of ester groups in ABM. This study clearly shows that P（AN-co-ABM） copolymer is a better material for use as a carbon fiber precursor than P（AN-AM-MA） terpolymer.

关键词： Polymerization Stabilization DSC Spinnability Carbon fiber

In situ polymerization of aniline in electrospun microfibers

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第1期25卷 83-86页

作者： Xiao-Qiang li Wan-Wan liu Shui-Ping liu meng-juan li Yong-Gui li Ming-Qiao Ge Key Laboratory of Eco-textiles Ministry of EducationJiangnan University College of Textile & Clothing Jiangnan University

Conductive microfibers with an average diameter of ca. 1.0 μm were prepared by in situ polymerization of aniline, in which poly（vinylchloride-acrylonitrile）（PVC-AN） was used as the filament-material in electrospinning to form precursor microfibers and carry the aniline monomers. Fourier-transform infrared （FTIR） results demonstrated that PANi was successfully polymerized in the microfibers. The morphology of the PVC-AN-PANi microfibers was observed by scanning electron microscopy （SEM）. Results of differential scanning calorimetry indicated that the polymer composite of PVC-AN-PANi formed via molecular interactions. Although the conductivity of PVC-AN-PANi microfibers was still limited （2.2 × 10^-8 S/cm）, this method provided an effective and convenient approach for preparing highly uniform and soft microfibrous electrodes.

关键词： Conductive microfibers Electrospinning Polymer composite Polyaniline

Preparation,characterization and biocompatibility of aspartic acid modified CdTe quantum dots

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第6期25卷 933-936页

作者： Shui-Ping liu Jia-Jia Fu meng-juan li lin lin Xiao-Qiang li Ming-Qiao Ge Key Laboratory of Eco-Textiles Ministry of Education(Jiangnan University) College of Textile & Clothing Jiangnan University School of Food & Biological Engineering Jiangsu University Technical University of Denmark DTU FoodSoltofts Plads B227.2800 Kgs.LyngbyDenmark

This study aims at preparing water soluble aspartic acid （ASP） modified CdTe quantum dots with tunable fluorescence emission controlled by reaction time. The size of the synthesized CdTe quantum dots was evaluated using transmission electron microscope （TEM） and also calculated based on their UV-vis spectra. The optical properties of TGA-CdTe quantum dots were characterized by UV-vis and fluorescence （FL） spectroscopy. The red-shift in the UV-vis absorption and FL emission with the increase of reaction time was observed. The biocompatibility examination indicated that the ASP modified CdTe QDs had low cytotoxicity.

关键词： Water-soluble quantum dots CdTe Surface modification Biocompatibility

Synthesis, Resolution, and Enantiomeric Purity Assay of 2-n-Butylbutanedioic Acid 4-t-Butyl Esters

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第5期22卷 584-588页

作者： ZHANG Da-tong TANG li-da DUAN Gui-yun ZHAO Gui-long XU Wei-ren meng li-juan WANG Jian-wu School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China The Pharmaceutical Research Institute of Tianjin Tianjin 300193 P. R. China

Racemic 2-n-butylbutanedioic acid 4-t-butyl esters were synthesized from methyl hexanoate and t-butyl α-iodoacetate via alkylation and subsequently selective hydrolyzation. The （R）-and （S）-2-n-butylbutanedioic acid 4-t-butyl esters were obtained by the resolution of the above-mentioned racemic compounds with（S）-（ - ） or（R）-（＋）-α- methylbenzylamine, respectively. The e.e. values of the two optical active products were determined to be above 99% by HPLC after the formation of two pairs of diastereoisomers with（R）-（＋）-α-methylbenzylamine and（S）- phenylalanine methyl ester.

关键词： Methyl hexanoate 4-t-Butyl 2-n-butylbutanedioic acid Resolution e.e. Value

Review on the abiotic degradation of biodegradable plastic poly(butylene adipate-terephthalate):Mechanisms and main factors of the degradation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第1期36卷 158-164页

作者： Haibo Ye Qianyu li juan li Didi li Zhimin Ao Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health Guangzhou Key Laboratory Environmental Catalysis and Pollution ControlInstitute of Environmental Health and Pollution ControlGuangzhou 510006China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of EducationSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China School of Environment Beijing Normal UniversityBeijing 100875China

Poly(butylene adipate-terephthalate)(PBAT),as one of the most common and promising biodegradable plastics,has been widely used in agriculture,packaging,and other industries due to its strong biodegradability *** is well known that PBAT suffers a series of natural weathering,mechanical wear,hydrolysis,photochemical transformation,and other abiotic degradation processes before being ***,it is particularly important to understand the role of abiotic degradation in the life cycle of *** the abiotic degradation of PBAT has not been systematically summarized,this review aims to summarize the mechanisms and main factors of the three major abiotic degradation pathways(hydrolysis,photochemical transformation,and thermochemical degradation)of *** was found that all of them preferentially destroy the chemical bonds with higher energy(especially C-O and C=O)of PBAT,which eventually leads to the shortening of the polymer chain and then leads to reduction in molecular *** main factors affecting these abiotic degradations are closely related to the energy or PBAT *** findings provide important theoretical and practical guidance for identifying effective methods for PBAT waste management and proposing advanced schemes to regulate the degradation rate of PBAT.

关键词： Biodegradable plastics PBAT Abiotic degradation Degradation mechanism

Sequence-activated chemiluminescence probes:programmable illumination for high-contrast in vivo sensing and imaging

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 26-34页

作者： Yutao Zhang juan li Wei-Hong Zhu Zhiqian Guo Shanghai Key Laboratory of Functional Materials Chemistry Joint International Research Laboratory of Precision Chemistry and Molecular EngineeringInstitute of Fine ChemicalsSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Bioreactor Engineering Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell MetabolismEast China University of Science&TechnologyShanghai 200237China

Sequence-activated chemiluminescence(CL)technique offers a unique approach to detecting specific biomolecules or cellular events with high sensitivity and spatial *** fundamental principle behind sequence-activated CL probes involves tailoring highly-controllable CL signals in response to specific sequences or events of interest,thus enabling high-contrast signals under complex physiological *** sequential activation could be triggered by enzymes,reactive oxygen species(ROS),biothiols or changes in the *** unique sequence-activated CL probes bestow several advantages,including minimal background,deep-tissue penetration,and the ability of non-invasive or minimally invasive *** sequence-activated CL techniques represent a significant advancement in molecular imaging and *** this mini-review,we focus on the latest developments in sequential CL probes,addressing the technical challenges and discussing the future trajectory by harnessing CL signaling and molecular recognition.

关键词： chemiluminescnece sequence-activation in-vivo bioimaging cyclic peroxide

在线全文

学校读者我要写书评

暂无评论

我国农产品营销渠道优化:日本经验与启示

价格月刊 2016年第2期 85-89页

作者：孟莉娟河南财政税务高等专科学校河南郑州451464

为适应农业现代化和农产品国际化竞争局面,日本根据本国农产品生产规模、标准化和科技化程度,逐步形成了独具特色的农产品营销渠道模式。"它山之石,可以攻玉",在对日本农产品营销渠道实践经验进行总结的基础上,结合我国农产品营销渠道... 详细信息

为适应农业现代化和农产品国际化竞争局面,日本根据本国农产品生产规模、标准化和科技化程度,逐步形成了独具特色的农产品营销渠道模式。"它山之石,可以攻玉",在对日本农产品营销渠道实践经验进行总结的基础上,结合我国农产品营销渠道现状及存在的问题,提出了我国农产品营销渠道模式优化的对策建议。

关键词：农产品营销渠道模式优化日本经验借鉴

Removal of arsenic from water by silver nanoparticles and Fe-Ce mixed oxide supported on polymeric anion exchanger

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第5期151卷 540-549页

作者： li li Su-juan Yu Rong-gang Zheng Qing-cun li Rui liu Jing-fu liu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China University of Chinese Academy of Sciences Beijing 100049China Department of Ecology and Resources Engineering He Tao CollegeInner Mongolia 015000China

By encapsulating nanoscale particles of goethite(α-FeO(OH)),hydrous ceric oxide(CeO_(2)·H_(2)O,HCO)and silver nanoparticles(AgNPs)in the pores of polystyrene anion exchanger D201,a novel nanocomposite FeO(OH)-HCO-Ag-D201 was prepared for the effective removal of arsenic from *** isotherm study shows that FeO(OH)-HCO-Ag-D201 has excellent adsorption performance for As(III)and As(V),with an increased adsorption capacity of As(III)to 40.12 mg/g compared to that of 22.03 mg/g by the composite adsorbent without AgNPs(FeO(OH)-HCO-D201).The adsorption kinetics data showed that the sorption rate of FeO(OH)-HCO-Ag-D201 for As(III)is less than that for As(V),and the adsorption of As(III)and As(V)were consistent with the pseudo-second-order model and the pseudofirst-order model,*** or basic conditions are favored for the adsorption of As(III/V)by FeO(OH)-*** with nitrate/chloride/bicarbonate,sulfate/silicate/phosphate showed more remarkable inhibition of arsenic removal by FeO(OH)-HCO-Ag-D201,whereas natural organic matter showed no interference to the arsenic *** As(V)adsorption involved different interactions such as electrostatic attraction and surface complexation,while the adsorption of As(III)involved the part oxidization of As(III)to As(V)and the simultaneous adsorption of As(III)and As(V).In addition to the Ce(IV)in CeO_(2)·H_(2)O acted as an oxidant,the synergistic effect ofα-FeO(OH)and AgNPs also contributed to the oxidization of As(III)to As(V).Moreover,the reusable property suggested that this FeO(OH)-HCO-Ag-D201 nanocomposite has great potential for arsenic-contaminated water purification.

关键词： FeO(OH)-HCO-Ag-D201 Arsenic removal Synergistic effect Oxidation Electrostatic attraction Surface complexation

回到“原点”——高职商务英语专业人才培养模式初探

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

教育学术月刊 2009年第1期 107-109页

作者：孟丽娟辽宁渤海大学高职学院

在市场需求的强势指引下,我国许多高校相继设置了商务英语专业,学历层次上呈现出一种多样化态势,高职商务英语的设置也正是迎合了这一社会需求。那么,如何根据高职的特色设置商务英语专业人才的培养模式便凸显在我们的面前。本文试从回... 详细信息

在市场需求的强势指引下,我国许多高校相继设置了商务英语专业,学历层次上呈现出一种多样化态势,高职商务英语的设置也正是迎合了这一社会需求。那么,如何根据高职的特色设置商务英语专业人才的培养模式便凸显在我们的面前。本文试从回到"原点",重新缕析了商务英语专业的学科定位及高职商务英语专业的培养目标,并从宏观与微观两个方面探讨了高职商务英语专业人才的培养模式。

关键词：商务英语高职商务英语专业人才培养模式

在线全文

学校读者我要写书评

暂无评论

探地雷达检测隧道衬砌厚度的研究

物探化探计算技术 2008年第3期30卷 231-234页

作者：李孟娟李川昆明理工大学信息工程与自动化学院昆明650051

在铁路、公路和水电站等项目的建设中,隧道、地下洞室工程通常是最为重要的工程。探地雷达作为一种快速、高效、高分辨率的无损探测技术,已在隧道衬砌厚度检测中得到推广和应用。这里介绍了探地雷达检测方法的工作原理,应用于隧道衬砌... 详细信息

在铁路、公路和水电站等项目的建设中,隧道、地下洞室工程通常是最为重要的工程。探地雷达作为一种快速、高效、高分辨率的无损探测技术,已在隧道衬砌厚度检测中得到推广和应用。这里介绍了探地雷达检测方法的工作原理,应用于隧道衬砌厚度检测时的测线布置,以及反射信号的形成过程,并讨论了应该如何结合地质、设计、施工资料对隧道衬砌结构层位进行划分。

关键词：探地雷达隧道衬砌反射波成像