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Review and prospect of the effects of freeze-thaw on soil geotechnical properties

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Research in Cold and Arid Regions 2021年第5期13卷 349-356页

作者： Tong Zhang HaiPeng Li chenchen hu XinYu Zhen ZhenHao Xu Yang Xue State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouJiangsu 221116China School of Mechanics and Civil Engineering China University of Mining Science and TechnologyXuzhouJiangsu 221116China

Freeze-thaw hazard is one of the main problems in cold regions engineering and artificial ground freezing *** mitigate freeze-thaw hazards,it is essential to investigate the effects of freeze-thaw on soils engineering *** paper summarizes the effects of freeze-thaw on the physical and mechanical properties of soils reported in recent *** differences of freeze-thaw conditions between freezing shaft sinking and cold regions engineering are *** on the technological characteristics of freezing shaft sinking in deep alluvium,we further attempt to identify key research needs regarding the freeze-thaw effects on the engineering properties of deep soils.

关键词： freeze-thaw effects soil physical and mechanical properties deep clay freezing shaft sinking

Copper fluoride as a low-cost sodium-ion battery cathode with high capacity

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Chinese Chemical Letters 2022年第3期33卷 1435-1438页

作者： Yiming Dai Qiujie Chen chenchen hu Yangyang huang Wangyan Wu Mingliang Yu Dan Sun Wei Luo Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Haixi Institute Xiamen Institute of Rare Earth MaterialsChinese Academy of SciencesXiamen 361021China

Sodium-ion batteries (SIBs) are promising alternatives to lithium-ion batteries (LIBs) for large-scale energy storage considering the abundance and low cost of Na-containing resources. However, the energy density of SIBs has been limited by the typically low specific capacities of traditional intercalation-based cathodes. Metal fluorides, in contrast, can deliver much higher capacities based on multi-electron conversion reactions. Among metal fluorides, CuF_(2) presents a theoretical specific capacity as high as 528 mAh/g while its Na-ion storage mechanism has been rarely reported. Here, we report CuF_(2) as a SIB cathode, which delivers a high capacity of 502 mAh/g but suffers from poor electrochemical reversibility. As a solution, we adjust the cell configuration by inserting a carbon-coated separator, which hinders the transportation of dissolved Cu ions and improves the reversibility of the CuF_(2) cathode. By using in-situ XRD measurements and theoretical calculation, we propose that a one-step conversion reaction occurs during the discharge process, and a reconversion reaction competes with the oxidization of Cu to dissolved Cu ion during the charge process.

关键词： Sodium-ion battery Copper fluoride Cathode Energy density Conversion reaction

Downregulation of cardiac PIASy inhibits Cx43 SUMOylation and ameliorates ventricular arrhythmias in a rat model of myocardial ischemia/reperfusion injury

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Chinese Medical Journal 2023年第11期136卷 1349-1357页

作者： Tingting Wang Jinmin Liu chenchen hu Xin Wei Linlin Han Afang Zhu Rong Wang Zhijun Chen Zhengyuan Xia Shanglong Yao Weike Mao Department of Anesthesiology Institute of Anesthesiology and Critical Care MedicineUnion HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430022China Department of Anesthesiology Wuhan No.1 HospitalWuhanHubei 430022China State Key Laboratory of Pharmaceutical Biotechnology Department of MedicineThe University of Hong KongHong KongChina

Background:Dysfunction of the gap junction channel protein connexin 43(Cx43)contributes to myocardial ischemia/reperfusion(I/R)-induced ventricular ***43 can be regulated by small ubiquitin-like modifier(SUMO)*** inhibitor of activated STAT Y(PIASy)is an E3 SUMO ligase for its target ***,whether Cx43 is a target protein of PIASy and whether Cx43 SUMOylation plays a role in I/R-induced arrhythmias are largely ***:Male Sprague-Dawley rats were infected with PIASy short hairpin ribonucleic acid(shRNA)using recombinant adeno-associated virus subtype 9(rAAV9).Two weeks later,the rats were subjected to 45 min of left coronary artery occlusion followed by 2 h *** was recorded to assess *** ventricular tissues were collected for molecular biological ***:Following 45 min of ischemia,QRS duration and QTc intervals statistically significantly increased,but these values decreased after transfecting PIASy *** downregulation ameliorated ventricular arrhythmias induced by myocardial I/R,as evidenced by the decreased incidence of ventricular tachycardia and ventricular fibrillation,and reduced arrythmia *** addition,myocardial I/R statistically significantly induced PIASy expression and Cx43 SUMOylation,accompanied by reduced Cx43 phosphorylation and plakophilin 2(PKP2)***,PIASy downregulation remarkably reduced Cx43 SUMOylation,accompanied by increased Cx43 phosphorylation and PKP2 expression after I/***:PIASy downregulation inhibited Cx43 SUMOylation and increased PKP2 expression,thereby improving ventricular arrhythmias in ischemic/reperfused rats heart.

关键词： Connexin 43 Myocardial reperfusion injury PIASy PKP2 SUMOylation Arrhythmias

Application of regularized logistic regression for movement-related potentials-based EEG classification

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Journal of Southeast University(English Edition) 2013年第1期29卷 38-42页

作者：胡晨晨王海贤东南大学学习科学中心南京210096

In order to improve classification accuracy, the regularized logistic regression is used to classify single-trial electroencephalogram （EEG）. A novel approach, named local sparse logistic regression （LSLR）, is proposed. The LSLR integrates the locality preserving projection regularization term into the framework of sparse logistic regression. It tries to maintain the neighborhood information of original feature space, and, meanwhile, keeps sparsity. The bound optimization algorithm and component-wise update are used to compute the weight vector in the training data, thus overcoming the disadvantage of the Newton-Raphson method and iterative re-weighted least squares （IRLS）. The classification accuracy of 80% is achieved using ten-fold cross-validation in the self-paced finger tapping data set. The results of LSLR are compared with SLR, showing the effectiveness of the proposed method.

关键词： logistic regression locality preserving projection regularization electroencephalogram

新发展理念下大学生高质量社会实践的三重意蕴

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广东农工商职业技术学院学报 2024年第3期40卷 64-68页

作者：胡陈陈广东省外语艺术职业学院广东广州510507

高校大学生社会实践要充分发挥其育人实效,就要回答好“为什么大学生要做社会实践、时代需要大学生社会实践怎么做、大学生期待通过社会实践得到什么”这三个重要问题。面对新时代的新要求,目前大学生社会实践活动仍存在实践形式呈现同... 详细信息

高校大学生社会实践要充分发挥其育人实效,就要回答好“为什么大学生要做社会实践、时代需要大学生社会实践怎么做、大学生期待通过社会实践得到什么”这三个重要问题。面对新时代的新要求,目前大学生社会实践活动仍存在实践形式呈现同质化现象、实践组织保障体系尚未完善、实践育人实效不够明显、实践内涵欠缺丰富、实践主体参与意识不强等短板。要实现新时代大学生社会实践工作的高质量发展,就必须在社会实践工作中贯彻新发展理念,坚持走社会实践创新发展、协调发展、绿色发展、开放发展、共享发展之路。

关键词：新发展理念大学生高质量社会实践路径

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一种测量液滴接触角的方法

激光与光电子学进展 2017年第8期54卷 289-293页

作者：陈陶胡晨晨方圆梁忠诚南京邮电大学微流控光学技术研究中心江苏南京210023 南京邮电大学光电工程学院江苏南京210023

采用垂直拍摄-测量直径法代替传统的侧面拍摄-提取轮廓-函数拟合求导法测量液滴接触角,省去了函数拟合过程,提高了测量效率。推导出液滴接触角的理论计算公式,利用计算机结合图像处理技术提取出液滴投影图像的边缘轮廓,测量得到边缘的直... 详细信息

采用垂直拍摄-测量直径法代替传统的侧面拍摄-提取轮廓-函数拟合求导法测量液滴接触角,省去了函数拟合过程,提高了测量效率。推导出液滴接触角的理论计算公式,利用计算机结合图像处理技术提取出液滴投影图像的边缘轮廓,测量得到边缘的直径,将其代入所推导出的理论公式求解出液滴接触角。实验获得了与理论计算一致的导电液滴接触角随电压变化的关系曲线,验证了该方法的可行性。

关键词：表面光学微流控液滴接触角垂直拍摄直径测量

基于紫外光/臭氧化学改性-选择性化学镀的聚甲基丙烯酸甲酯表面区域金属化

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化学学报 2012年第20期70卷 2144-2148页

作者：胡贤巧蒋艳何巧红施秧梦胡辰辰汤凝陈恒武浙江大学化学系微分析系统研究所杭州310058

研究以紫外光光化学反应为基础的在聚甲基丙烯酸甲酯(PMMA)表面区域选择性金属化的方法.通过对无臭氧紫外光、紫外光+臭氧(UV/O3)、臭氧对PMMA表面亲水化改性效果的对比,发现仅有UV/O3可有效地使PMMA表面亲水.表面红外光谱表明,UV/O3对P... 详细信息

研究以紫外光光化学反应为基础的在聚甲基丙烯酸甲酯(PMMA)表面区域选择性金属化的方法.通过对无臭氧紫外光、紫外光+臭氧(UV/O3)、臭氧对PMMA表面亲水化改性效果的对比,发现仅有UV/O3可有效地使PMMA表面亲水.表面红外光谱表明,UV/O3对PMMA表面协同作用的结果是在辐照区域生成了羧基等含氧活性基团.以此含氧活性基团为基础,经过胺化、氯金酸阴离子交换、NaBH4还原等表面反应,在UV/O3作用区域形成化学镀所必须的金纳米催化中心,再将PMMA浸入镀金、镀铜等化学镀浴中,即可实现PMMA表面的区域金属化.以打印的菲林片为原始掩膜,该方法分辨率可达50μm或更小.以该法制备了金和铜的薄膜微电极、金膜微电热器等金属微器件,并表征了它们的物理化学性能.

关键词：聚甲基丙烯酸甲酯选择性金属化紫外光臭氧化学镀

哌嗪类新精神活性物质BZP及TFMPP拉曼光谱特性研究

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分析试验室 2023年第10期42卷 1364-1372页

作者：吴国萍胡辰辰陆腾吴元钊江苏警官学院刑事科学技术系南京210031 江苏省食品药品与环境犯罪检验技术工程研究中心南京210031 中国科学院计算机网络信息中心高性能计算技术与应用发展部北京100083 浙江警察学院刑事科学技术系浙江省毒品防控技术研究重点实验室杭州310051

运用密度泛函理论(DFT)优化哌嗪类新精神活性物质1-苄基哌嗪(BZP)和1-(3-三氟甲基苯基)哌嗪(TFMPP)的几何构型,结合实验测得的拉曼谱图对标准品拉曼谱图的振动模式进行指认和归属,并与低浓度样品的表面增强拉曼(SERS)谱图进行比较;使用... 详细信息

运用密度泛函理论(DFT)优化哌嗪类新精神活性物质1-苄基哌嗪(BZP)和1-(3-三氟甲基苯基)哌嗪(TFMPP)的几何构型,结合实验测得的拉曼谱图对标准品拉曼谱图的振动模式进行指认和归属,并与低浓度样品的表面增强拉曼(SERS)谱图进行比较;使用自制纳米金、NaCl溶液为助剂,优化BZP和TFMPP的SERS检测条件。在最优条件下,BZP和TFMPP的检出限分别为10 ng/mL和1μg/mL;重复性实验中2种样品的主要特征峰强度相对标准偏差(RSD)分别4.5%~14%和4.0%~16%。运用基于Matlab自行开发的设计分子光谱数据分析系统的BP神经网络模块,对模拟未知样品进行预测,30份BZP样品和26份TFMPP样品的预测值与真实值比值的平均值(AVG)分别为1.21和0.99,RSD分别为22%和14%。本文可为BZP和TFMPP的拉曼检测提供理论依据和快检方法。

关键词：密度泛函理论表面增强拉曼光谱 BP神经网络哌嗪类新精神活性物质

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混凝土螺栓杆预埋件极限承载力计算新方法

江苏建材 2020年第6期 43-45,51页

作者：胡晨晨南京倍特建设有限公司江苏南京210000

对于混凝土螺栓杆预埋件,国内外学者研究较少,且国内相关规范尚没有确定其极限承载力计算方法。讨论了国内外文献中4种关于混凝土螺栓杆预埋件极限承载力的计算方法,并将现有的4种和新提出的计算方法对216个混凝土螺栓杆预埋件进行理论... 详细信息

对于混凝土螺栓杆预埋件,国内外学者研究较少,且国内相关规范尚没有确定其极限承载力计算方法。讨论了国内外文献中4种关于混凝土螺栓杆预埋件极限承载力的计算方法,并将现有的4种和新提出的计算方法对216个混凝土螺栓杆预埋件进行理论值计算与试验结果对比。结果表明,4种计算方法的结果均有较大程度的离散,新提出的计算方法与试验结果能有较好的吻合。

关键词：螺栓杆预埋件计算方法极限承载力