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Upper-rim-modified thioether thiacalix[4]arene used for liquid-liquid extraction of Au(Ⅲ)and Pd(Ⅱ)in hydrochloric acid medium

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Chinese Journal of Chemical Engineering 2024年第2期66卷 110-118页

作者： Sheng Wan Rong Xie Jianhong fan Kewen tang Department of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414006China

Gold(Au)and palladium(Pd)play an increasing role in the production and human life;Therefore,it is of great significance to study their recovery.A 5,11,17,23-tetra-ethylthio-25,26,27,28-tetra-hydroxyl thiacalix[4]arene(TCAET)was synthesized specifically for the capture of Au(Ⅲ)and Pd(Ⅱ)from HCl medium by liquid-liquid *** a 0.1 mol·L^(-1)HCl medium,the transfer of Au(Ⅲ)and Pd(Ⅱ)from the aqueous phase to the organic phase was highly efficient,with a transfer ratio of 100%for Au(Ⅲ)and 98%for Pd(Ⅱ).Furthermore,the extraction equilibrium time for Au(Ⅲ)was just 5 ***'s method data demonstrated that TCAET formed complexes with Au(Ⅲ)and Pd(Ⅱ)in a ratio of 2:3 and 1:1,respectively,during the extraction *** showed high selectivity toward Pd(Ⅱ)and Au(Ⅲ)over other competing metal ***,both Au(Ⅲ)and Pd(Ⅱ)could be successfully stripped from the loaded organic phases with a 1.0 mol·L^(-1)thiourea in 0.5 mol·L^(-1)HCl and 0.5 mol·L^(-1)thiourea in 0.5 mol·L^(-1)HCl,*** obtained from five consecutive extraction-stripping cycles showed good reusability of TCAET toward Au(Ⅲ)and Pd(Ⅱ)*** conclusion can provide a certain reference for thiacalixarene in the recovery of precious metal species.

关键词： Thiacalixarene Upper-rim modification Liquid-liquid extraction Precious metal Thioether

Effects of formal credit on pastoral household expense: Evidence from the Qinghai-Xizang Plateau of China

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Journal of Integrative Agriculture 2024年第5期23卷 1774-1785页

作者： Yan Zhang Yi Huang fan Zhang Zeng tang State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020China

Formal credit is critical in agricultural production,allowing more expenditure and productive input,thereby improving farmers'*** pastoral China,formal financial institutions are gradually ***,a limited understanding remains of how formal credit affects herders'household *** on a survey of 544 herders from the Qinghai-Xizang Plateau of China,this study adopted the propensity score matching approach to identify the effect of formal credit on herders'total household expenses,daily expenses,and productive *** results found that average age,grassland mortgage,and other variables significantly affected herders'participation in formal *** credit could significantly improve household expenses,especially productive expenses.A heterogeneity analysis showed that formal credit had a greater impact on the household total expense for those at higher levels of wealth;however,it significantly affected the productive expense of herders at lower wealth ***,the mediating effect indicated that formal credit could affect herders'household income,thus influencing their household ***,this study suggests that policies should improve herders'accessibility to formal credit.

关键词： formal credit herders expense Qinghai-Xizang Plateau

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工程车辆驾驶员疲劳状况调查研究

人类工效学 2024年第2期30卷 23-29页

作者：何婷易灿南何佳媛吴文唐范湖南工学院安全与管理工程学院湖南衡阳421002

目的调查工程车辆驾驶员疲劳情况,分析影响驾驶员疲劳的影响因素,为工程车辆驾驶人员疲劳缓解与预防提供依据。方法设计工程车辆驾驶员疲劳调查问卷,随机抽取现职工程车辆驾驶员,对155位驾驶员进行问卷调查;运用SPSS26.0进行概率、单因... 详细信息

目的调查工程车辆驾驶员疲劳情况,分析影响驾驶员疲劳的影响因素,为工程车辆驾驶人员疲劳缓解与预防提供依据。方法设计工程车辆驾驶员疲劳调查问卷,随机抽取现职工程车辆驾驶员,对155位驾驶员进行问卷调查;运用SPSS26.0进行概率、单因素分析、相关分析和多重响应分析,得到工程车辆驾驶员疲劳影响因素及影响因素之间的相关关系。结果155份有效问卷中,工程车辆驾驶员疲劳症状发生率依次为腰部(35.48%)、颈部(30.32%)、肩部(29.68%)、背部(27.74%),单因素分析结果显示导致工程车辆驾驶员疲劳的主要因素包括学历、工作年限、驾龄、每天工作时间及每周工作时间。相关分析结果显示,肌肉骨骼损伤、体力疲劳感觉、疲劳程度感觉、睡眠质量、工作压力、驾驶员疲劳等驾驶作业疲劳构成因素之间均呈极显著正相关。结论工程车辆驾驶员疲劳部位主要体现在腰部与颈部,其危险因素主要包括不良的驾驶习惯、不合理的轮班制度及较差的休息环境,应开展有效的干预措施。

关键词：工程车辆驾驶疲劳职业健康问卷调查

脊髓损伤患者神经源性肠道功能障碍管理的最佳证据总结

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中华现代护理杂志 2024年第7期30卷 919-925页

作者：文菁莲唐炜罗玉红唐帆陈广林杨绪梅钟羽昕贵州医科大学护理学院外科护理学教研室贵阳550001 贵州医科大学附属医院骨科贵阳550001 贵州医科大学附属医院护理部贵阳550001

目的:检索、评价并整合国内外脊髓损伤患者神经源性肠道功能障碍(NBD)管理的最佳证据,为临床开展相关循证实践提供依据。方法:计算机检索国内外各数据库、专业协会网站中关于脊髓损伤患者NBD管理的证据,包括指南、专家共识、临床决策及... 详细信息

目的:检索、评价并整合国内外脊髓损伤患者神经源性肠道功能障碍(NBD)管理的最佳证据,为临床开展相关循证实践提供依据。方法:计算机检索国内外各数据库、专业协会网站中关于脊髓损伤患者NBD管理的证据,包括指南、专家共识、临床决策及系统评价,检索时限为建库至2023年3月31日。结果:共纳入文献13篇,包括指南5篇、证据总结5篇、专家共识2篇、临床决策1篇。从脊髓损伤患者NBD管理的病史评估、药物管理、物理治疗、饮食运动及健康教育5个方面总结了33条推荐意见。结论:本研究汇总的脊髓损伤患者NBD管理最佳证据具有科学性和实用性,医护人员应结合临床实际情况选择性应用最佳证据。

关键词：脊髓损伤神经源性肠道功能障碍证据总结循证护理

A Comparative Study of CNN-and Transformer-Based Visual Style Transfer

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Journal of Computer Science & Technology 2022年第3期37卷 601-614页

作者： Hua-Peng Wei Ying-Ying Deng fan tang Xing-Jia Pan Wei-Ming Dong School of Artificial Intelligence Jilin UniversityChangchun 130012China National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China Youtu Laboratory Tencent IncorporatedShanghai 200233China

Vision Transformer has shown impressive performance on the image classification *** that most existing visual style transfer(VST)algorithms are based on the texture-biased convolution neural network(CNN),here raises the question of whether the shape-biased Vision Transformer can perform style transfer as *** this work,we focus on comparing and analyzing the shape bias between CNN-and transformer-based models from the view of VST *** comprehensive comparisons,we propose three kinds of transformer-based visual style transfer(Tr-VST)methods(Tr-NST for optimization-based VST,Tr-WCT for reconstruction-based VST and Tr-AdaIN for perceptual-based VST).By engaging three mainstream VST methods in the transformer pipeline,we show that transformer-based models pre-trained on ImageNet are not proper for style transfer *** to the strong shape bias of the transformer-based models,these Tr-VST methods cannot render style *** further analyze the shape bias by considering the influence of the learned parameters and the structure *** prove that with proper style supervision,the transformer can learn similar texture-biased features as CNN *** the reduced shape bias in the transformer encoder,Tr-VST methods can generate higher-quality results compared with state-of-the-art VST methods.

关键词： transformer convolution neural network visual style transfer comparative study

Antibacterial Property of Cu Modified Stainless Steel by Plasma Surface Alloying

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Journal of Iron and Steel Research International 2012年第4期19卷 75-79页

作者： ZHANG Xiang-yu HUANG Xiao-bo JIANG Li MA Yong fan Ai-lan tang Bin Research Institute of Surface Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China

Stainless steel（SS） is not recommended to be used in hospital environments for work surfaces and door furniture due to the lack of antibacterial *** this end,a novel SS surface modified layer with both a quick bacterial killing rate and relatively thick has been obtained by plasma surface alloying with *** microstructure,elements distribution and phase identification were analyzed by SEM,GDS,XRD and XPS.A spread plate method was adopted for evaluation of antibacterial property of specimens against Escherichia coli（***） and Staphylococcus aureus（***）.The experimental results demonstrate that the surface modified layer with the thickness of about 26 μm is uniform and *** layer is mainly composed of a mixture of pure Cu,expanded austenite phase and a few Fe3O4 *** Cu modified layer exhibits excellent antibacterial effects against *** and *** within 1 *** viable *** and *** was found after 3 h（100% killed）.The modified layer is relatively thick,hence it is expected that the Cu modified SS will have a durable antibacterial function

关键词： plasma alloying Cu antimicrobial AISI 304 stainless steel

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含大规模光储系统的电网暂态稳定特性分析

四川电力技术 2024年第4期47卷 53-58页

作者：梁晓斌刘佳钰李鑫汤凡张宇栋国家电网有限公司西南分部

大规模光伏和储能接入电网使电网的暂态特性复杂化、暂态稳定问题多样化。为了明确大规模光伏和储能对电网暂态稳定性的影响，在仿真软件中搭建了含大规模光储系统的某地区电网仿真模型，分析了不同系统结构参数和变流器控制参数对含大... 详细信息

大规模光伏和储能接入电网使电网的暂态特性复杂化、暂态稳定问题多样化。为了明确大规模光伏和储能对电网暂态稳定性的影响，在仿真软件中搭建了含大规模光储系统的某地区电网仿真模型，分析了不同系统结构参数和变流器控制参数对含大规模光储系统的电网暂态稳定特性的影响：对于系统结构参数，研究光伏渗透率和储能光伏容量比对系统暂态稳定性的影响；对于变流器控制参数，分析光伏低电压穿越控制参数对系统暂态稳定性影响。并基于此研究了提升系统暂态稳定性的控制参数调整措施，可为光伏储能并网规划和运行提供实证参考。

关键词：光储系统光伏渗透率储能光伏容量比低电压穿越暂态稳定性

Transformers in computational visual media:A survey

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Computational Visual Media 2022年第1期8卷 33-62页

作者： Yifan Xu Huapeng Wei Minxuan Lin Yingying Deng Kekai Sheng Mengdan Zhang fan tang Weiming Dong Feiyue Huang Changsheng Xu NLPR Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100040China School of Artificial Intelligence Jilin UniversityChangchun 130012China Youtu Lab Tencent Inc.Shanghai 200233China CASIA-LLVISION Joint Lab Beijing 100190China

Transformers,the dominant architecture for natural language processing,have also recently attracted much attention from computational visual media researchers due to their capacity for long-range representation and high *** are sequence-to-sequence models,which use a selfattention mechanism rather than the RNN sequential ***,such models can be trained in parallel and can represent global *** study comprehensively surveys recent visual transformer *** categorize them according to task scenario:backbone design,high-level vision,low-level vision and generation,and multimodal *** key ideas are also *** from previous surveys,we mainly focus on visual transformer methods in low-level vision and *** latest works on backbone design are also reviewed in *** ease of understanding,we precisely describe the main contributions of the latest works in the form of *** well as giving quantitative comparisons,we also present image results for low-level vision and generation *** costs and source code links for various important works are also given in this survey to assist further development.

关键词： visual transformer computational visual media(CVM) high-level vision low-level vision image generation multi-modal learning

Spectral Fittings of Warm Coronal Radiation with High Seed Photon Temperature:Apparent Low-temperature and Flat Soft Excess in AGNs

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Research in Astronomy and Astrophysics 2024年第7期24卷 135-144页

作者： Ze-Yuan tang Jun-Jie Feng Jun-Hui fan School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province Guangzhou 510006China Key Laboratory for Astronomical Observation and Technology of Guangzhou Guangzhou 510006China

A warm corona has been widely proposed to explain the soft excess(SE)in X-ray above the 2-10 ke V power law extrapolation in Active Galactic Nuclei(AGNs).In actual spectral fittings,the warm coronal seed photon temperature(T_s)is usually assumed to be far away from the soft X-ray,but kT_scan reach close to 0.1 ke V in the standard accretion disk *** this study,we used Monte Carlo simulations to obtain radiation spectra from a slab-like warm corona and fitted the spectra using the spherical-geometry-based routine THCOMP or a thermal *** findings reveal tha high T_scan influence the fitting results.A moderately high kT_s(around 0.03 ke V)can result in an apparent low-temperature and flat SE,while an extremely high kT_s(around 0.07 ke V)can even produce an unobserved blackbody-like *** conclusions indicate that,for spectral fittings of the warm coronal radiation(SE in AGNs),kT_sshould be treated as a free parameter with an upper limit,and an accurate coronal geometry is necessary when kT_s>0.01 ke V.

关键词： galaxies active-accretion-accretion disks-black hole physics