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Curing Reaction Kinetics of Epoxy Resin Using Dicyandiamide Modified by Aromatic Amines

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Wuhan University Journal of Natural Sciences 2007年第6期12卷 1105-1108页

作者： chen Lianxi TIAN hua LIU Quanwen Wang Jun School of Science Wuhan University of Technology Wuhan 430070 Hubei China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 Hubei China

The curing reaction and reaction mechanism of epoxy resin E-44, for which aromatic amine modified dicyandiamide was used as a curing reagent, were investigated by means of differential scanning calorimetry （DSC）. The results showed that the modified dicyandiamide had better curing characteristic than unmodified dicyandiamide for epoxy resin E-44, and the curing reaction could be carried out at moderate temperature. Apparent activation energy of the curing reaction was decreased appreciably from 123.829 kJ/mol to 61.550-64.405 kJ/mol, and reaction order was decreased from 0.941 to 0.896-0.900. Curing reaction mechanism also was discussed.

关键词： modified dicyandiamide aromatic amine epoxy resin kinetics

A Combined Countermeasure Against Side-Channel and Fault Attack with Threshold Implementation Technique

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Chinese Journal of Electronics 2023年第2期32卷 199-208页

作者： JIAO Zhipeng chen hua FENG Jingyi KUANG Xiaoyun YANG Yiwei LI Haoyuan FAN Limin Trusted Computing and Information Assurance Laboratory Institute of SoftwareChinese Academy of Sciences University of Chinese Academy of Sciences Electric Power Research Institute China Southern Power Grid

Side-channel attack(SCA) and fault attack(FA) are two classical physical attacks against cryptographic implementation. In order to resist them, we present a combined countermeasure scheme which can resist both SCA and FA. The scheme combines threshold implementation and duplication-based exchange techniques. The exchange technique can confuse the fault propagation path and randomize the faulty values. The threshold implementation technique can ensure a provable security against SCA. Moreover, it can also help to resist the FA by its incomplete property and random numbers. Compared with other methods, the proposed scheme has simple structure, which can be easily implemented in hardware and result in a low implementation cost. Finally, we present a detailed design for the block cipher light encryption device(LED) and implement *** hardware cost evaluation shows our scheme has the minimum overhead factor.

关键词： Resistance Ciphers Costs Resists Side-channel attacks Light emitting diodes Hardware

丙酮酸激酶同工酶M2介导长非编码RNA RP11-879F14.2发挥抑制心肌细胞肥大作用

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中国生物化学与分子生物学报 2024年第4期40卷 544-553页

作者：李艺温艺红伍华燕姜佳雪欧涛陈凯茵刘宇鹏单志新南方医科大学附属广东省人民医院(广东省医学科学院)医学研究部广东省临床药理学重点实验室广州510080 华南理工大学医学院广州510006 南方医科大学附属广东省人民医院(广东省医学科学院)心内科广州510080

越来越多的证据表明,长非编码RNA(lncRNA)在生物学功能调节中发挥着重要的作用。实时定量PCR(RT-qPCR)检测显示,与健康器官捐献者(n=23)相比,长非编码RNARP11-879F14.2在心力衰竭(heart failure,HF)患者(n=21)心肌中表达水平显著升高,... 详细信息

越来越多的证据表明,长非编码RNA(lncRNA)在生物学功能调节中发挥着重要的作用。实时定量PCR(RT-qPCR)检测显示,与健康器官捐献者(n=23)相比,长非编码RNARP11-879F14.2在心力衰竭(heart failure,HF)患者(n=21)心肌中表达水平显著升高,但其在心肌肥厚调节中可能的作用和机制尚不清楚。利用腺病毒介导在乳小鼠心肌细胞(neonatal mouse ventricular cardiomyocytes,NMVCs)和乳大鼠心肌细胞(neonatal rat ventricular cardiomyocytes,NRVCs)中过表达RP11-879F14.2,检测对NMVCs中心肌肥厚相关基因,包括肌球蛋白重链(MYH7)、骨骼肌肌动蛋白(Acta1)以及心钠素(NPPA)表达的影响,结果显示,过表达RP11-879F14.2可显著抑制NMVCs和NRVCs中心肌肥厚相关基因表达。RT-qPCR和Western印迹结果证实,当过表达RP11-879F14.2时可显著促进NMVCs中丙酮酸激酶同工酶M2(PKM 2)表达。并且,过表达PKM 2和RP11-879F14.2可一致地抑制NMVCs和NRVCs中心肌肥厚相关基因表达和去氧肾上腺素(phenylephrine,PE)诱导NRVCs的表面积增加,而敲降PKM 2可逆转RP11-879F14.2对NMVCs中心肌肥厚相关基因表达的抑制作用。利用Seahorse 96XF细胞能量分析仪检测显示,过表达RP11-879F14.2和PKM 2可一致增加NMVCs中葡萄糖代谢水平,而沉默PKM 2对RP11-879F14.2上调NMVCs中糖酵解、三羧酸(TCA)循环和线粒体电子传递链(ETC)相关基因的表达有显著的抑制作用。因此,PKM 2介导RP11-879F14.2发挥抑制心肌细胞肥大的作用。

关键词：心肌肥厚心肌细胞长非编码RNA 丙酮酸激酶同工酶M2

A multi-model prediction system for ENSO

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Science China Earth Sciences 2023年第6期66卷 1231-1240页

作者： Ting LIU Yanqiu GAO Xunshu SONG Chuan GAO Lingjiang TAO Youmin TANG Wansuo DUAN Rong-hua ZHANG Dake chen State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 300012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Key Laboratory of Ocean Circulation and Waves Institute of Oceanologyand Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China College of Oceanography Hohai UniversityNanjing 210098China Environmental Science and Engineering University of Northern British ColumbiaPrince GeorgeBritish Columbia V2N 4Z9Canada State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesUniversity of Chinese Academy of SciencesBeijing 100029China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Laoshan Laboratory Qingdao 266237China

The El Niño and Southern Oscillation(ENSO)is the primary source of predictability for seasonal climate *** improve the ENSO prediction skill,we established a multi-model ensemble(MME)prediction system,which consists of 5 dynamical coupled models with various complexities,parameterizations,resolutions,initializations and ensemble strategies,to account for the uncertainties as sufficiently as *** results demonstrated the superiority of the MME over individual models,with dramatically reduced the root mean square error and improved the anomaly correlation skill,which can compete with,or even exceed the skill of the North American Multi-Model *** addition,the MME suffered less from the spring predictability barrier and offered more reliable probabilistic *** real-time MME prediction adequately captured the latest successive La Niña events and the secondary cooling trend six months *** MME prediction has,since April 2022,forecasted the possible occurrence of a third-year La Niña ***,our MME prediction system offers better skill for both deterministic and probabilistic ENSO prediction than all participating *** improvements are probably due to the complementary contributions of multiple models to provide additive predictive information,as well as the large ensemble size that covers a more reasonable uncertainty distribution.

关键词： MME ENSO Prediction

储粮害虫对磷化氢的抗性现状及其综合管理策略

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粮油食品科技 2024年第1期32卷 161-167页

作者：张惠妍陈鑫张洪清李燕羽田小卫周桂明陶海华巩建民国家粮食和物资储备局科学研究院粮食储运研究所北京100037 粮食储运国家工程研究中心北京100037 天津农学院园艺园林学院天津300392 沧州渤海新区盛泰化工有限公司河北沧州061113 鑫微晟科技(上海)有限公司上海200090

熏蒸剂被世界卫生组织批准用于储存粮食,对储存或运输粮食的区域进行消杀,减少虫霉活动以减少储存损失。磷化氢具有经济性、易施用、扩散快、无残留综合性优势,对各种仓储有害生物都具有很高的消杀作用,成为世界上主要熏蒸剂之一。由于... 详细信息

熏蒸剂被世界卫生组织批准用于储存粮食,对储存或运输粮食的区域进行消杀,减少虫霉活动以减少储存损失。磷化氢具有经济性、易施用、扩散快、无残留综合性优势,对各种仓储有害生物都具有很高的消杀作用,成为世界上主要熏蒸剂之一。由于一些熏蒸剂淘汰,加大了对磷化氢依赖性,且由于缺乏规范性指导和磷化氢的不合理应用导致储粮害虫对磷化氢产生了严重的抗药性,抗性发展危及到磷化氢的防治效果和可持续性。本文综述了国内外储粮害虫对磷化氢抗性现状和趋势,解析了呼吸及表皮相关表达基因和解毒代谢酶的抗性遗传基础,比较了联合国粮食及农业组织(FAO)测试、剂量生物测定法、快速击倒检测和分子鉴定四种抗性检测方法优缺点,探索了熏蒸方案优化、实验室+实仓验证及应用建议的抗性管理关键策略,以期为今后磷化氢的科学合理使用和其他防治方法的开发提供参考信息。

关键词：磷化氢抗性遗传基础分子鉴定管理策略

饮食诱导肥胖雌鼠棕色脂肪组织蛋白质组学分析

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山东大学学报（医学版） 2024年第2期62卷 10-19页

作者：梁中昊庄向华黄珊韩晓琳华梦羽琚丽萍陈诗鸿山东大学第二医院内分泌代谢科山东济南250033 山东大学第二医院肾脏多学科创新医学中心山东济南250033

目的探讨高脂饮食(high-fat diet,HFD)对雌性小鼠棕色脂肪蛋白组学的影响。方法构建高脂饮食诱导的肥胖雌鼠模型。对照组(CON组)小鼠给予普通饮食,实验组(HFD组)小鼠给予高脂饮食,均喂养21周,每周记录小鼠体质量,使用小动物体脂分析仪... 详细信息

目的探讨高脂饮食(high-fat diet,HFD)对雌性小鼠棕色脂肪蛋白组学的影响。方法构建高脂饮食诱导的肥胖雌鼠模型。对照组(CON组)小鼠给予普通饮食,实验组(HFD组)小鼠给予高脂饮食,均喂养21周,每周记录小鼠体质量,使用小动物体脂分析仪测量身体成分,通过经腹葡萄糖耐量试验(intraperitoneal glucose tolerance test,IPGTT)和胰岛素耐量试验(insulin tolerance test,ITT)评估小鼠葡萄糖耐量和胰岛素耐量。处死小鼠后迅速收集棕色脂肪(brown adipose tissue,BAT)标本于液氮中,后续进行液相色谱-串联质谱检测(liquid chromatography-tandem mass spectrometry,LC-MS)及蛋白组学数据分析(n=4)。结果与CON组相比,HFD组小鼠体质量增加,体脂含量增加,糖耐量和胰岛素耐量受损。蛋白组学分析以差异倍数(fold change,FC)>1.5或<0.67,且P<0.05为标准筛选差异蛋白,聚类分析热图结果显示,HFD小鼠Ucp1水平升高,蛋白免疫印迹(Western blotting,WB)结果显示,HFD小鼠棕色脂肪中Ucp1水平更高;亚细胞定位分析表明线粒体是含有差异蛋白数目最多的细胞器;基因本体(gene ontology,GO)功能和京都基因和基因组数据库(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路富集分析显示:与CON组相比,HFD组下调蛋白主要与肌肉收缩有关,涉及钙信号通路等,而上调蛋白主要与脂质分解代谢有关,涉及脂质氧化过程以及产热、氧化磷酸化等通路;蛋白质相互作用分析提示网络中心蛋白主要与脂质合成、脂肪酸β氧化有关。结论肥胖状态下,雌鼠BAT产热通路激活,并伴有脂肪酸β氧化增强和脂肪合成减弱。

关键词：饮食诱导肥胖棕色脂肪产热蛋白质组学

Crystallization tailoring of cesium/formamidinium double-cation perovskite for efficient and highly stable solar cells

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Journal of Energy Chemistry 2020年第9期29卷 217-225,I0007页

作者： Jianchao Yang Yu chen Weijian Tang Shubo Wang Qingshan Ma Yihui Wu Ningyi Yuan Jianning Ding Wen-hua Zhang Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology Changzhou UniversityChangzhou 213164JiangsuChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering Physics596 Yinhe RoadChengdu 610200SichuanChina Miro/Nano Science and Technology Center Jiangsu UniversityZhenjiang 212013JiangsuChina

Achieving high-quality perovskite crystal films is a critical prerequisite in boosting solar cell efficiency and improving the device stability,but the delicate control of nucleation and growth of the perovskite film remains limited ***,a facile but effective strategy has been developed to finely tailor the crystallization of thermally stable cesium/formamidinium(Cs/FA)based perovskite via partially replacing PbI2 with PbCl2 in the precursor *** incorporation of chlorine into the perovskite crystal lattice derived from PbCl2 changes the crystallization process and improves the crystal quality,which further results in the formation of larger crystal grains compared to the control *** larger crystal grains with high crystallinity lead to reduced grain boundaries,suppressed non-radiative recombination,and enhanced photoluminescence *** the optimized conditions,the methylammonium free perovskite solar cells(PSCs)delivers a champion power conversion efficiency(PCE)of 21.30%with an open-circuit voltage as high as 1.18 V,which is one of the highest efficiencies for Cs/FA based PSCs up to ***,the unencapsulated PSC devices retain more than 95%and 81%of their original PCEs even after long-term(over one year)storage under ambient conditions or 2000 h’s thermal aging at 850C in a nitrogen atmosphere,respectively.

关键词： Crystallization tailoring Crystal quality Stability Perovskite solar cells

聚乙烯醇/纳米纤维素气凝胶的力学及吸油性能

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上海纺织科技 2024年第8期52卷 54-58页

作者：陈瑜滕婷陈迈谭慧林温润张慧敏沈华东华大学纺织学院纺织面料技术教育部重点实验室上海201620 大连工业大学纺织与材料工程学院辽宁大连116034

纳米纤维素(cellulose nanofiber,CNF)气凝胶机械稳定性能差、油水分离能力弱,限制了其在吸油领域的应用。提出用交联剂聚乙烯醇(polyvinyl alcohol,PVA)和改性剂甲基三甲氧基硅烷(methyltrimethoxysilane,MTMS)对CNF气凝胶进行改性,尝... 详细信息

纳米纤维素(cellulose nanofiber,CNF)气凝胶机械稳定性能差、油水分离能力弱,限制了其在吸油领域的应用。提出用交联剂聚乙烯醇(polyvinyl alcohol,PVA)和改性剂甲基三甲氧基硅烷(methyltrimethoxysilane,MTMS)对CNF气凝胶进行改性,尝试了溶液法和气相沉积法(chemical vapor deposition,CVD)两种改性方法。研究发现,溶液改性法制得的疏水气凝胶吸油倍率很低,而气相沉积法制得的气凝胶吸油倍率为40~60 g/g;当承受35 kPa外力时,弹性回复率可达95%。

关键词：吸油材料纳米纤维素气凝胶聚乙烯醇力学性能

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基于CoDeSys的通用控制器的实现

建筑机械 2024年第4期 71-73页

作者：孟兴黄磊梁海华陈林旗周强湖南中联重科智能技术有限公司湖南长沙410006 湖南中联重科混凝土泵送机械分公司湖南长沙410006

为了满足工程机械领域控制器的国产化替代需求,文章介绍了一种基于CoDeSys的通用控制器的实现方法。该控制器基于公司成熟的嵌入式硬件平台,将符合IEC61131标准的CoDeSys Runtime移植到该平台,向下适配底层驱动,向上封装用户接口。该通... 详细信息

为了满足工程机械领域控制器的国产化替代需求,文章介绍了一种基于CoDeSys的通用控制器的实现方法。该控制器基于公司成熟的嵌入式硬件平台,将符合IEC61131标准的CoDeSys Runtime移植到该平台,向下适配底层驱动,向上封装用户接口。该通用型控制器已经在泵车上小批搭载,实车搭载表明,该款CoDeSys控制器能满足泵车控制器的功能和性能需求。

关键词：泵车 CoDeSys 控制器 Runtime