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Design and synthesis of thiol-terminated imidothioether oligomer as thermally latent hardener and modifier for high-performance epoxy/thiol thermosets

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Science China Chemistry 2024年第2期67卷 632-641页

作者： Xing Liu Jianjun zhou shumei Liu Jianqing Zhao School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Key Lab Guangdong High Property&Functional Polymer Materials Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangzhou510640China

Conventional base-catalyzed epoxy/aliphatic thiol systems have a poor storage stability,and are impossible to be one-pot systems.A widely accepted solution is to use the latent catalysts,which are usually insoluble anionic initiators sensitive to impurities and moisture,and have many limitations in practical *** this work,a soluble thiol-terminated imidothioether oligomer(TPI) was synthesized and used as a latent hardener and modifier to prepare one-pot epoxy/thiol systems without the latent *** latent behavior and curing mechanism of epoxy systems(EP/TPI series),consisted of bisphenol A diglycidyl ether(DGEBA),pentaerythritol tetrakis(mercaptoacetate)(PETMP) and TPI,were *** thiol exchange reaction between TPI and PETMP preceded the curing reaction of DGEBA,and produced aromatic thiols,which were unreactive at ambient conditions and reacted with DGEBA to form the thermosets at temperatures above 130 ℃.At the loading of 24.4 wt%TPI,the epoxy system(EP/TPI-3) had a shelf life of 13 days and was completely cured within 20 min at 180 ℃.Meanwhile,the catalyst-free curing process of EP/TPI-3 system was insensitive to impurities and ***,the thermal and mechanical properties of EP/TPI-3 thermoset were simultaneously improved,thereinto,the glass transition temperature,Young's modulus and ultimate tensile strength were increased by 16.7 ℃,12.9%,and 13.6%,respectively,compared with those of the commercial DGEBA/PETMP *** work shows that TPI has the potential to be a powerful alternative to commercial latent catalysts,and EP/TPI thermosets with high performance have broad application prospects.

关键词： thiol-terminated imidothioether oligomer epoxy systems thiol exchange reaction thermal latency high performance

Effects of rye grass coverage on soil loss from loess slopes

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International Soil and Water Conservation Research 2015年第3期3卷 170-182页

作者： Yuequn Dong Tingwu Lei Shuqin Li Cuiping Yuan shumei zhou Xiusheng Yang College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Agricultural Clear Watershed Group Institute of Agro-environment and Sustainable DevelopmentCAASBeijing 100081China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Science and Ministry of Water ResourcesYanglingShaanxi 712100China Beijing Grandtopeak Tianpinghang Land Plan and Design Co. Ltd.Beijing 100081China e School of Eonomics and Management Hebei University of Science and TechnologyShijiazhuang050018China University of Connecticut Department of Natural Resources and the EnvironmentStorrs 06269 United States

Vegetative coverage is commonly used to reduce urban slope soil *** experimental study on soil erosion under grass covered slopes is conventionally time and space *** this study,a new method is suggested to study the influences of vegetation coverage on soil erosion from a sloped loess surface under three slope gradients of 51,151,and 251;four rye grass coverages of 0%,25%,50%,and 75%;and three rainfall intensities of 60,90,and 120 mm/h with a silt-loamy loess *** grasses were planted in the field with the studied soil before being transplanted into a laboratory *** was allowed to resume growth for a period before the rain simulation *** showed that the grass cover reduced soil erosion by 63.90%to 92.75%and sediment transport rate by 80.59%to 96.17%under different slope gradients and rainfall *** sediment concentration/sediment transport rate from bare slope was significantly higher than from a grass-covered *** sediment concentration/transport rate from grass-covered slopes decreased linearly with grass coverage and increased with rainfall *** sediment concentration/transport rate from the bare slope increased as a power function of slope and reached the maximum value at the gradient of about 251,whereas that from grass-covered slope increased linearly and at much lower *** results of this study can be used to estimate the effect of vegetation on soil erosion from loess slopes.

关键词： Loess soil Rainfall simulation Slope Soil erosion Surface coverage

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含驻留约束和重入的双臂集束型设备调度方法

上海交通大学学报 2016年第6期50卷 923-928,936页

作者：周炳海周淑美同济大学机械与能源工程学院上海201804

为了有效解决双臂集束型设备调度过程中的驻留约束和重入问题,采用虚拟化方法将双臂机械手转化为一个单臂机械手和一个虚拟缓冲模块,定义了晶圆投放策略,建立了调度问题的非线性规划模型.在此基础上,结合所建数学模型提出了一种基于搜... 详细信息

为了有效解决双臂集束型设备调度过程中的驻留约束和重入问题,采用虚拟化方法将双臂机械手转化为一个单臂机械手和一个虚拟缓冲模块,定义了晶圆投放策略,建立了调度问题的非线性规划模型.在此基础上,结合所建数学模型提出了一种基于搜索的启发式算法,并对其进行仿真分析.结果表明,所提出的算法是可行且有效的.

关键词：驻留约束重入双臂机械手设备调度

Insights into effects of thermotolerant nitrifying and sulfur-oxidizing inoculants on nitrogen-sulfur co-metabolism in sewage sludge composting

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Journal of Environmental Sciences 2024年第10期144卷 76-86页

作者： Tingting Hou Yujie zhou Rongchun Du Jiali Liu Weiguang Li shumei Zhang Muzi Li Junhong Chu Liqiang Meng Institute of Microbiology Heilongjiang Academy of SciencesHarbin 150010China Hebei University of Environmental Engineering Hebei Key Laboratory of Agroecological SafetyQinhuangdao 066102China School of Environment Harbin Institute of TechnologyHarbin 150090China

In this study,high temperature thermotolerant nitrifying bacteria(TNB)and high temperature thermotolerant sulfide oxidizing bacteria(TSOB)were obtained from compost samples and inoculated into sewage sludge(SS)*** effects of inoculation on physical and chemical parameters,ammonia and hydrogen sulfide release,nitrogen form and sulfur compound content change and physical-chemical properties during nitrogen and sulfur conversion were *** results showed that inoculation of TNB and TSOB increased the temperature,pH,OM degradation,C/N ratio and germination index(GI)of *** with the control treatment(CK),the addition of inoculants reduced the release of NH3 and H2S,and transformed them into nitrogen and sulfur compounds,the hydrolysis of polymeric ferrous sulfate was promoted,resulting in relatively high content of sulfite and *** the same time,the physical and chemical properties of SS have a strong correlation with nitrogen and sulfur compounds.

关键词： Sewage sludge Composting Inoculation Thermotolerant nitrifying bacteria Thermotolerant sulfurized oxidizing bacteria

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嵌入纺涤棉复合纱线及其织物性能研究

纺织工程学报 2024年第5期2卷 31-39页

作者：秦缘彭智勇周淑梅蒋臻杨建祥许多刘可帅武汉纺织大学纺织科学与工程学院武汉430073 武汉纺织大学省部共建纺织新材料与先进加工技术国家重点实验室武汉430073 斐乐体育有限公司福建厦门361001 安踏(中国)有限公司福建厦门362212

为更好地探究嵌入纺技术对涤棉混纺纱线品质及其机织物的服用性能的影响,通过调控长丝与短纤维须条的相对位置,纺制三种不同结构的嵌入纱与一种赛络菲尔包芯纱。将嵌入纱与赛络菲尔包芯纱的表观结构、毛羽、条干均匀度、强伸性能进行测... 详细信息

为更好地探究嵌入纺技术对涤棉混纺纱线品质及其机织物的服用性能的影响,通过调控长丝与短纤维须条的相对位置,纺制三种不同结构的嵌入纱与一种赛络菲尔包芯纱。将嵌入纱与赛络菲尔包芯纱的表观结构、毛羽、条干均匀度、强伸性能进行测试表征,并对比分析了相同规格嵌入纺织物与包芯纺织物的强伸性、耐磨性、柔软性、透气性、吸湿快干性。结果表明:相比于包芯纺涤棉纱线以及长丝与短纤维须条存在位置偏移的嵌入纺涤棉纱线,长丝对称位于成纱三角区外侧且短纤维须条对称位于内侧时,所纺制嵌入纺涤棉纱线的毛羽少,条干均匀,强力高,拉伸性好;相比于包芯纺涤棉织物,嵌入纺涤棉织物的强伸性、耐磨性、柔软性、透气性以及吸湿快干性能均有所提升。

关键词：嵌入纺赛络菲尔纺包芯纺涤棉纱线成纱质量织物性能

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带驻留约束的双臂集束型设备群的调度方法

哈尔滨工业大学学报 2014年第1期46卷 83-89页

作者：周炳海刘明祥周淑美同济大学机械与能源工程学院上海201804

为提高集束型设备群的生产效率,在考虑加工不同种类晶圆条件下,研究带驻留约束的双臂集束型设备群的建模与调度问题.提出虚拟缓冲模块概念,引入时间区间集来描述系统的运行状态,并以此建立调度问题的非线性规划模型;结合数学模型,提出... 详细信息

为提高集束型设备群的生产效率,在考虑加工不同种类晶圆条件下,研究带驻留约束的双臂集束型设备群的建模与调度问题.提出虚拟缓冲模块概念,引入时间区间集来描述系统的运行状态,并以此建立调度问题的非线性规划模型;结合数学模型,提出一种以时间区间集为核心的基于虚拟缓冲模块概念和交换策略的调度算法;对所提出的算法进行了仿真分析.结果表明:所构建的算法运行时间短,调度1个Lot数量的晶圆仅仅需要0.5 s左右,响应时间快;与研究问题域的下界比较,算法的结果接近下界;当设备因子大于5时,周期延长率R已经全部小于0.05,取得了较好的调度效果,表明算法是可行且有效的.

关键词：集束型设备群双臂机械手驻留约束时间区间集调度

Parallel Physics-Informed Neural Networks Method with Regularization Strategies for the Forward-Inverse Problems of the Variable Coefficient Modified KdV Equation

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Journal of Systems Science & Complexity 2024年第2期37卷 511-544页

作者： zhou Huijuan School of Science Shanghai Maritime UniversityShanghai 201306China

This paper mainly introduces the parallel physics-informed neural networks(PPINNs)method with regularization strategies to solve the data-driven forward-inverse problems of the variable coefficient modified Korteweg-de Vries(VC-MKdV)*** the forward problem of the VC-MKdV equation,the authors use the traditional PINN method to obtain satisfactory data-driven soliton solutions and provide a detailed analysis of the impact of network width and depth on solving accuracy and ***,the author finds that the traditional PINN method outperforms the one with locally adaptive activation functions in solving the data-driven forward problems of the VC-MKdV *** for the data-driven inverse problem of the VC-MKdV equation,the author introduces a parallel neural networks to separately train the solution function and coefficient function,successfully addressing the function discovery problem of the VC-MKdV *** further enhance the network’s generalization ability and noise robustness,the author incorporates two regularization strategies into the *** amount of numerical experimental data in this paper demonstrates that the PPINNs method can effectively address the function discovery problem of the VC-MKdV equation,and the inclusion of appropriate regularization strategies in the PPINNs can improves its performance.

关键词： Data-driven forward-inverse problems parallel physics-informed neural networks regularization strategies variable coefficient modified KdV equation

Influence of stearic acid surface modification on flowability and agglomeration of battery grade Li_(2)CO_(3)powder

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Particuology 2024年第9期92卷 263-277页

作者： Ming zhou Lithium Industry Center Zhejiang New Era Zhongneng Technology Co.Ltd.Shaoxing312000China

This work investigates the flow and agglomeration behaviors of battery grade Li_(2)CO_(3)powder and the influence of stearic acid surface *** degree of agglomeration is directly related to the uniformity of Li_(2)CO_(3)and its powder *** to the Chinese National Nonferrous Metal Industry Standard,battery grade Li_(2)CO_(3)powder has D50 equal to 3–8μm which belongs to a micron-sized superfine ***,with the extension of storage time,the serious agglomeration phenomenon occurs due to the large specific surface area and rough and irregular powder *** Hausner ratio(HR)of the unmodified sample increases from 1.14 to 1.41,and the corresponding flowability is classified as good to ***,among samples with doping stearic acid,the optimum amount of it is 0.10 wt%which exhibits an extremely stable HR value from 1.14 to ***,after 156 days,the repose angle(AR)obtained for samples without surface modification and using 0.10 wt%stearic acid are calculated to be 49°and 28°,*** on the values of HR and AR,the flowability of the unmodified sample is poor while the sample modified with 0.10 wt%of stearic acid still maintain excellent powder flow ***,The LiMn_(2)O_(4)cathode material synthesized from modified Li_(2)CO_(3)powder with a stearic acid content of 0.10 wt%exhibits good crystallinity and comparable electrochemical performance to that prepared by commercial Li_(2)CO_(3).These results indicate that stearic acid has the potential to be an ideal modifier for battery grade Li_(2)CO_(3)powder that needs to be kept for a long time.

关键词： Battery grade Li_(2)CO_(3)powder Flowability Surface modification Stearic acid

基于CiteSpace的农业灌溉水资源价值知识图谱分析

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中国农机化学报 2023年第3期44卷 141-148页

作者：周淑梅李晶晶卢娜河北科技大学经济管理学院石家庄市050018 河北省生态经济可持续发展研究中心石家庄市050018

基于2000—2021年WoS数据库收录的3687条农业灌溉用水价值相关文献,利用CiteSpace软件绘制全球灌溉用水价值研究的知识图谱,分析国内外灌溉用水价值研究的发文量、作者、国家、期刊和机构分布情况、研究热点及发展趋势。研究结果表明:2... 详细信息

基于2000—2021年WoS数据库收录的3687条农业灌溉用水价值相关文献,利用CiteSpace软件绘制全球灌溉用水价值研究的知识图谱,分析国内外灌溉用水价值研究的发文量、作者、国家、期刊和机构分布情况、研究热点及发展趋势。研究结果表明:2000—2021年,灌溉用水价值领域发文量整体呈上升趋势;发文核心作者和团队主要来自中国和美国;研究力量主要分布在中国、美国、西班牙等国家;中国科学院、中国农业大学、德黑兰大学等机构贡献突出;灌溉水价和水资源的利用效率始终是研究的热点内容;从发展趋势看,灌溉用水价值的多维度评估以及灌溉用水价值的时空动态变化特征是未来研究关注的热点;多源时空数据源、结合计算机人工智能技术的多种定价方法的融合及优化成为灌溉用水价值研究的新趋势。

关键词：农业灌溉水资源价值 CiteSpace 知识图谱

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