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黄钾铁矾对硫脲浸金的影响及草酸盐的作用机理

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Transactions of Nonferrous Metals Society of China 2024年第1期34卷 322-335页

作者：李科李骞姜涛杨永斌徐斌许瑞张雁中南大学资源加工与生物工程学院长沙410083

研究生物氧化产生的黄钾铁矾对酸性硫脲浸金的影响,并探讨草酸添加剂的作用机制。结果表明,黄钾铁矾会增加硫脲的消耗和阻碍金的溶解。黄钾铁矾能显著提高硫脲的分解,阻碍金的溶解。黄钾铁矾造成不利影响的主要原因可能是酸性溶液中黄... 详细信息

研究生物氧化产生的黄钾铁矾对酸性硫脲浸金的影响,并探讨草酸添加剂的作用机制。结果表明,黄钾铁矾会增加硫脲的消耗和阻碍金的溶解。黄钾铁矾能显著提高硫脲的分解,阻碍金的溶解。黄钾铁矾造成不利影响的主要原因可能是酸性溶液中黄钾铁矾释放的铁离子使溶液浆电位增加,从而加速硫脲的分解,并加剧硫脲分解产生的钝化物种对金表面的钝化作用。添加草酸盐可以有效削弱黄钾铁矾的不利影响,表现为明显降低硫脲的消耗和促进金的溶解。通过溶液电位、Zeta电位和XPS分析,揭示草酸的可能作用机理。草酸盐不仅可以通过与Fe^(3+)配位减弱Fe^(3+)与硫脲之间的相互作用,还可以通过无差别吸附和静电斥力阻止钝化产物在金表面包裹。

关键词：生物黄钾铁矾金浸出硫脲消耗草酸盐

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柔性抗冻导电凝胶的构筑

高分子材料科学与工程 2024年第6期40卷 144-151页

作者：徐艺倩卢麒麟闽江学院福建省新型功能性纺织纤维及材料重点实验室福建福州350108

为解决传统水凝胶材料在低温时发生冻结,导致其部分力学功能丧失的问题,文中利用甘油体系纳米纤维素(CNC)与α-硫辛酸之间的氢键,再以FeCl3为交联剂,进一步诱导硫辛酸聚合形成凝胶网络,构筑了柔性抗冻导电凝胶CNC/α-硫辛酸凝胶。该凝... 详细信息

为解决传统水凝胶材料在低温时发生冻结,导致其部分力学功能丧失的问题,文中利用甘油体系纳米纤维素(CNC)与α-硫辛酸之间的氢键,再以FeCl3为交联剂,进一步诱导硫辛酸聚合形成凝胶网络,构筑了柔性抗冻导电凝胶CNC/α-硫辛酸凝胶。该凝胶具有优异的力学性能、导电性能及灵敏的应变传感性能。CNC/α-硫辛酸凝胶的拉伸性能和抗冻测试表明,甘油体系纳米纤维素含量为1.5 g时,凝胶的拉伸断裂应力达到16 kPa,断裂伸长率为805.5%,且在-40℃的低温条件下电导率仍能维持在0.029S/m,抗冻导电性能良好。应变传感性能测试表明,凝胶具有灵敏的应变传感能力,在应变150%~200%时,凝胶的灵敏度系数(GF)值达到2.36,能够进行人体运动监测,表明CNC/α-硫辛酸凝胶可作为柔性应变传感器用于智能可穿戴设备。

关键词：纳米复合凝胶柔性抗冻导电应变传感纳米纤维素 α-硫辛酸

Robust output regulation for a class of hyperbolic PDE systems based on DeepONet

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Robust output regulation for a class of hyperbolic PDE syste...

Dual-end Aggregation Embedding Multiple-Object Tracking with Autoregressive Cascade Transformer

第35届中国过程控制会议

作者： Yu Xiao Xiaodong xu xunyuan Yin Central South University School of Automation Nanyang Technological University School of Chemistry Chemical Engineering and Biotechnology

Thanks to the global approximation ability of the DeepONet in approximating operators from function spaces to other function spaces, the DeepONet has been employed as a gain solver in the backstepping stabilization control for boundary controllable PDE systems. Prior to the implementation, the DeepONet can be trained offline on a dataset containing a sufficient number of system parameters and correspondingly exact solutions of the kernel equations. Once the DeepONet is well-trained,as a gain solver it can generate approximate gain function with arbitrary accuracy, and more notably the solving time is greatly reduced compared with numerical PDE solver in generating gain function. In this paper, we extend the neural operator（NO）theory to a more complex field of robust regulation control for a class of hyperbolic PDE systems. Although the DeepONet cannot eliminate the approximation error, the regulator designed based on the internal model principle is robust to the error in approximate gain and a certain degree of parameter uncertainty. Therefore, the tracking error can still converge to 0 if the extended regulator equation is solvable. A series of theory proofs of the regulation problem and a numerical test under the approximate gain are presented. It is shown that NO is almost three orders of magnitude faster than PDE solver in generating kernel function, and the loss remains on the order of 10. This provides a new insight to use the NO methodology for accelerated gain scheduling regulation for PDEs with time-varying parameters.

关键词： DeepONet Neural operator Hyperbolic PDE systems Robust output regulation

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Dual-end Aggregation Embedding Multiple-Object Tracking with...

第35届中国过程控制会议

作者： xueyin Bai Degang xu Junsong Li School of Automation Central South University

Multiple object tracking aims to predict the continuous trajectories of targets. Currently, most multiple object tracking algorithms employ deep learning-based object detectors, followed by matching and association based on appearance and motion information. This staged processing approach hinders the temporal modeling of objects and algorithm's performance is predominantly influenced by the object detector. To address this, we propose a robust end-to-end multiple object tracking algorithm, named Dual-end Aggregation Embedding Multiple-Object Tracking with Transformer(DAEMOTR). Our network is built upon the DETR framework, with the key distinction of incorporating two sequential decoders to focus more on detecting newly appearing targets. Additionally, we introduce a temporal-aware enhancement module(TARM) at the encoder end to capture motion information of the targets. In the decoder end, we update the target states through a self-iterative process. Experimental results on both public datasets and real-world scenarios demonstrate the strong performance of our proposed method.

关键词： Multiple object tracking Deep learning DETR End to End

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CO_(2)的N-甲酰化反应研究进展

石油炼制与化工 2024年第7期55卷 152-162页

作者：郭旭何鑫徐润夏国富中石化石油化工科学研究院有限公司北京100083

二氧化碳(CO_(2))的N-甲酰化反应是CO_(2)在还原剂的作用下,与有机胺类化合物反应生成N-甲酰胺类化合物的反应。CO_(2)的N-甲酰化反应既能够实现CO_(2)的资源化利用,有助于减少温室气体排放,同时能够将廉价的CO_(2)转化为高附加值的有... 详细信息

二氧化碳(CO_(2))的N-甲酰化反应是CO_(2)在还原剂的作用下,与有机胺类化合物反应生成N-甲酰胺类化合物的反应。CO_(2)的N-甲酰化反应既能够实现CO_(2)的资源化利用,有助于减少温室气体排放,同时能够将廉价的CO_(2)转化为高附加值的有机化学品,如N,N-二甲基甲酰胺和N-甲酰吗啉等,拓展CO_(2)下游转化利用的反应网络。对近年来CO_(2)的N-甲酰化反应的催化剂体系、催化机理和反应工艺等方面进行综述,阐述该反应研究过程中所面临的问题,并展望其未来发展方向。

关键词： CO_(2) N-甲酰化催化剂反应工艺

Alkaline sphingomyelinase deficiency impairs intestinal mucosal barrier integrity and reduces antioxidant capacity in dextran sulfate sodium-induced colitis

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World Journal of Gastroenterology 2024年第10期30卷 1405-1419页

作者： Ye Tian Xin Li xu Wang Si-Ting Pei Hong-Xin Pan Yu-Qi Cheng Yi-Chen Li Wen-Ting Cao Jin-Dong Ding Petersen Ping Zhang International School of Public Health and One Health Hainan Medical UniversityHaikou 571199Hainan ProvinceChina Medical Laboratory Science and Technology College Harbin Medical University-Daqing CampusDaqing 163000Heilongjiang ProvinceChina Department of Laboratory Diagnosis Qiqihar Tuberculosis Control CenterQiqihar 161000Heilongjiang ProvinceChina Department of Public Health University of CopenhagenCopenhagen 1353Denmark Department of Public Health University of Southern DenmarkOdense 5000Denmark

BACKGROUND Ulcerative colitis is a chronic inflammatory disease of the colon with an unknown *** sphingomyelinase(alk-SMase)is specifically expressed by intestinal epithelial cells,and has been reported to play an anti-inflammatory ***,the underlying mechanism is still *** To explore the mechanism of alk-SMase anti-inflammatory effects on intestinal barrier function and oxidative stress in dextran sulfate sodium(DSS)-induced *** Mice were administered 3%DSS drinking water,and disease activity index was determined to evaluate the status of *** permeability was evaluated by gavage administration of fluorescein isothiocyanate dextran,and bacterial translocation was evaluated by measuring serum *** epithelial cell ultrastructure was observed by electron *** blotting and quantitative real-time reverse transcription-polymerase chain reaction were used to detect the expression of intestinal barrier proteins and mRNA,*** oxidant and antioxidant marker levels were analyzed using commercial kits to assess oxidative stress *** Compared to wild-type(WT)mice,inflammation and intestinal permeability in alk-SMase knockout(KO)mice were more severe beginning 4 d after DSS *** mRNA and protein levels of intestinal barrier proteins,including zonula occludens-1,occludin,claudin-3,claudin-5,claudin-8,mucin 2,and secretory immunoglobulin A,were significantly reduced on 4 d after DSS *** observations revealed progressive damage to the tight junctions of intestinal epithelial ***,by day 4,mitochondria appeared swollen and ***,compared to WT mice,serum malondialdehyde levels in KO mice were higher,and the antioxidant capacity was significantly *** expression of the transcription factor nuclear factor erythroid 2-related factor 2(Nrf2)in the colonic mucosal tissue of KO mice was significantly decr

关键词： Alkaline sphingomyelinase Intestinal mucosal barrier Antioxidant capacity Dextran sulfate sodium-induced colitis nuclear factor erythroid 2-related factor 2

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适用于太阳电池的低应力高增益升压变换器

太阳能学报 2024年第2期45卷 480-488页

作者：许杰马小三安徽工业大学电气与信息工程学院马鞍山243032

在太阳能开发利用过程中,升压变换器能实现较高升压比,但存在开关器件电压应力过高问题。为了降低开关器件电压应力,提出一种低应力高增益升压变换器基本结构,在提高电压增益的同时降低了电压应力。为了更好地适用于多种升压场合,将二... 详细信息

在太阳能开发利用过程中,升压变换器能实现较高升压比,但存在开关器件电压应力过高问题。为了降低开关器件电压应力,提出一种低应力高增益升压变换器基本结构,在提高电压增益的同时降低了电压应力。为了更好地适用于多种升压场合,将二次型升压网络、开关电感网络、开关电感电容网络和准Z源网络4种升压单元对其储能电感进行替换,得到一类低应力高增益升压变换器,分析了利用准Z源网络替代的高增益升压变换器工作特性,并与同类型变换器进行对比分析。最后,利用Matlab/Simulink仿真软件和实验样机验证了所提变换器理论分析的正确性和可行性。

关键词：光伏发电准Z源升压单元高增益低应力升压变换器

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步枪弹侵彻背部穿硬防护人体靶标钝击效应研究

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兵器装备工程学报 2024年第4期45卷 119-127页

作者：汪萌温垚珂徐诚许倞南京理工大学机械工程学院南京210094 中国兵器工业第208研究所北京102202

针对枪弹侵彻穿防弹衣人体背部产生脊柱脊髓钝性损伤,建立了DBP10式5.8 mm步枪弹侵彻NIJⅢ级SiC/UHMWPE防弹插板的数值模型,采用JHB本构和基于Abaqus二次开发的VUMAT本构分别模拟SiC陶瓷和UHMWPE层合板;开展了5.8 mm步枪弹侵彻NIJⅢ级Si... 详细信息

针对枪弹侵彻穿防弹衣人体背部产生脊柱脊髓钝性损伤,建立了DBP10式5.8 mm步枪弹侵彻NIJⅢ级SiC/UHMWPE防弹插板的数值模型,采用JHB本构和基于Abaqus二次开发的VUMAT本构分别模拟SiC陶瓷和UHMWPE层合板;开展了5.8 mm步枪弹侵彻NIJⅢ级SiC/UHMWPE防弹插板的数值模拟,通过基于高速摄影的弹道实验结果对比验证了数值模型的准确性;基于枪弹侵彻防弹插板的数值模拟结果,开展了5.8 mm步枪弹以910 m/s入靶速度侵彻背部穿硬防护人体躯干靶标的数值模拟,明确了步枪弹击中防弹衣后压力波在肌肉-脊柱内的传导规律,还原了枪弹侵彻过程中人体典型器官(心、肝、肺、胃等)的应力波传递过程。结果表明:人体背部在枪弹钝击作用下会在脊椎椎骨上产生瞬时高应力,可能导致椎骨骨折、椎间盘突出和脊柱不稳定;致伤点T10椎体后方脊髓最大应力为1.04 MPa,可能导致脊髓改变;对脊髓上应力与加速度线性回归分析表明,压力与加速度呈正相关。

关键词：钝性损伤防弹插板数值模拟步枪弹人体躯干

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基于前景理论的软件缺陷预测过采样方法

计算机集成制造系统 2024年第8期30卷 2822-2831页

作者：徐彪严远亭张以文安徽大学计算智能与信号处理教育部重点实验室安徽合肥230601 安徽大学计算机科学与技术学院安徽合肥230601

在软件缺陷预测中,数据困难因子对预测性能的影响比类不平衡更为明显。然而,大多数现有软件缺陷预测过采样方法在解决类不平衡问题过程中,忽视了软件项目数据集固有的数据困难因子,从而导致预测性能不佳。针对上述问题,提出一种基于前... 详细信息

在软件缺陷预测中,数据困难因子对预测性能的影响比类不平衡更为明显。然而,大多数现有软件缺陷预测过采样方法在解决类不平衡问题过程中,忽视了软件项目数据集固有的数据困难因子,从而导致预测性能不佳。针对上述问题,提出一种基于前景理论的过采样算法(POS)。POS同时考虑局部邻域中同类和异类样本的影响来评估少数类样本的学习难度,通过基于引力的策略构建同类收益和异类损失来刻画样本的前景值,并强调异类损失来计算少数类样本的采样权重,以此降低引入数据困难因子的风险,提高合成样本的质量,进一步提升预测性能。在NASA数据集上的实验结果表明,POS算法在AUC、balance和G-mean等性能指标上均有所提升,具有更好的缺陷预测性能。

关键词：软件缺陷预测类不平衡数据困难因子过采样前景理论