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Chinese Journal of Chemical Engineering 2023年第12期64卷 87-95页

作者： Hui-Yong wu Hong-Xin Fu yu Liu Xiao-Sa zhang Wen-Ze Li Jian Luan College of Science Shenyang University of Chemical TechnologyShenyang 110142China College of Sciences Northeastern UniversityShenyang 110819China

Synthesis of mixed matrix membranes(MMM)using carbon nanotubes(CNTs)has shown great prospects for achieving excellent selective separation because of its special ***,the preparation of highly selective MMM faces challenges,which is attributed to the obstacles encountered by CNTs dispersion in polymer matrix and elimination of interface defects.A novel CNT-based composite decorated with metal–organic framework(MOF)was synthesized and applied to the preparation of *** was post modified,and then carboxyl groups were inserted on the outer surface of *** synthetic MMM(Cu-MOF-en@MWCNT)not only has selective adsorption on dyes,but also has selective photodegradation on *** method of using CNTs to wrap the outside of MOF has great potential in dye *** performance of MMM was further improved by decorating MOF on the filler to improve the selectivity to the designated dye.

关键词： Composites Carbon nanotube Metal-organic framework Organic crosslinking Selectivity Adsorbents

MoS_(2)/MoO_(2) nanosheets anchored on carbon cloth for high-performance magnesium-and sodium-ion storage

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Journal of Materials Science & Technology 2023年第12期143卷 43-53页

作者： Hui wu Zhennan Xiong Yiyang Mao Huihui zhang Yingying Hu Jun Shen Baofeng Wang Xuebin yu Department of Materials Science Fudan UniversityShanghai 200433China Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric PowerShanghai 200090China

Developing new types of rechargeable metal-ion batteries beyond lithium-ions,including alkaline ion(such as Na+,K+)and multivalent ion(such as Mg 2+,Zn 2+,Ca 2+and Al 3+)batteries,is progressing quickly towards large-scale energy storage ***,the major obstacle to their large-scale applications has been a lack of appropriate electrode materials with reversible metal ions insertion/extraction be-havior,resulting in inferior electrochemical *** we develop a well-designed MoS_(2)/MoO_(2) hybrid nanosheets anchored on carbon cloth(MoS_(2)/MoO_(2)/CC)as electrode *** rational de-sign can effectively shorten ion diffusion distance,increase electric conductivity of the electrode,and buffer volume *** from the synergistic effect of structural and compositional features,the MoS_(2)/MoO_(2)/CC electrode exhibits high initial reversible capacities(326 mA h g^(−1) at 0.1 A g^(−1) in magnesium-ion storage;1270 mA h g^(−1) at 0.1 A g^(−1) in sodium-ion storage),excellent rate capacities(57 mA h g^(−1) at 10 A g^(−1) in magnesium-ion storage;335 mA h g^(−1) at 5 A g^(−1) in sodium-ion storage)and long-term cycling stability(105 mA h g^(−1) after 600 cycle at 1 A g^(−1) in magnesium-ion storage;208 mA h g^(−1) after 600 cycles at 5 A g^(−1) in sodium-ion storage).We expect that the multi-engineering strategy will provide some valuable insights for the development of other advanced electrode materials for high-performance metal-ion batteries.

关键词： Metal-ion batteries MoS_(2)/MoO_(2)/CC Magnesium and sodium storage High reversibility

Covalent triazine-based frameworks confining cobalt single atoms for photocatalytic CO_(2) reduction and hydrogen production

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Journal of Materials Science & Technology 2022年第21期116卷 41-49页

作者： Guocheng Huang Guiyun Lin Qing Niu Jinhong Bi ling wu Department of Environmental Science and Engineering Fuzhou UniversityMinhouFujian 350108China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityMinhouFujian 350108China

Single-atom catalysts(SACs)have emerged as an advanced frontier in heterogeneous catalysis due to their potential to maximize the atomic ***,covalent triazine-based frameworks(CTFs)confining cobalt single atoms(Co-SA/CTF)photocatalysts have been synthesized and used for efficient CO_(2) reduction and hydrogen production under visible light *** resulted Co-SA/CTF demonstrate excellent photocatalytic activity,with the CO and H2 evolution rates reaching 1665.74μmol g^(−1) h^(−1) and 1293.18μmol g^(−1) h^(−1),respectively,far surpassing those of Co nanoparticles anchored CTF and pure CTF.A variety of instrumental analyses collectively indicated that Co single atoms sites served as the reaction center for activating the adsorbed CO_(2) molecules,which significantly improved the CO_(2) reduction ***,the introduction of Co single atoms could accelerate the separation/transfer of photogenerated charge carriers,thus boosting the photocatalytic *** study envisions a novel strategy for designing efficient photocatalysts for energy conversion and showcases the application of CTFs as attractive support for confining metal single atoms.

关键词： Covalent triazine-based frameworks Co single atoms Photocatalysis CO_(2)reduction Hydrogen evolution

Research progress on refractory composition and deformability of shell molds for TiAl alloy castings

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China Foundry 2018年第1期15卷 1-10页

作者： Chun-ling Bao Shuang-qi zhang yu-yan Ren You-wei zhang Hua-sheng Xie Jun Zhao Titanium Alloy Division Shenyang Research Institute of Foundry School of Materials Science and Engineering Shenyang University of Technology

At present, most TiAl components are produced by an investment casting process. Environmental and economic pressures have, however, resulted in a need for the industry to improve the current casting quality, reduce manufacturing costs and explore new markets for the process. Currently, the main problems for investment casting of TiAl alloys are cracks, porosities, and surface defects. To solve these problems, many studies have been conducted around the world, and it is found that casting defects can be reduced by improving composition and properties of the shell molds. It is important to make a summary for the related research progress for quality improvement of TiAl castings. So, the development on refractory composition of shell molds for TiAl alloy investment castings was reviewed, and research progress on deformability of shell mold for TiAl alloy castings both at home and abroad in recent years was introduced. The existing methods for deformability characterization and methods for improving the deformability of shell molds were summarized and discussed. The updated advancement in numerical simulation of TiAl alloy investment casting was presented, showing the necessity for considering the deformability of shell mold during simulation. Finally, possible research points for future studies on deformability of shell mold for TiAl alloy investment casting were proposed.

关键词： TiAl based alloys investment casting shell mold deformability

Supply-based optimal scheduling of oil product pipelines

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Petroleum Science 2016年第2期13卷 355-367页

作者： Hao-Ran zhang Yong-Tu Liang Qiao Xiao Meng-yu wu Qi Shao Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum Beijing 102249China CNPC Trans-Asia Gas Pipeline Company Ltd. Beijing 100007 China

Oil product pipelines have features such as transporting multiple materials, ever-changing operating conditions, and synchronism between the oil input plan and the oil offloading plan. In this paper, an optimal model was established for a single-source multi-distribution oil pro- duct pipeline, and scheduling plans were made based on supply. In the model, time node constraints, oil offloading plan constraints, and migration of batch constraints were taken into consideration. The minimum deviation between the demanded oil volumes and the actual offloading volumes was chosen as the objective function, and a linear programming model was established on the basis of known time nodes＇ sequence. The ant colony optimization algo- rithm and simplex method were used to solve the model. The model was applied to a real pipeline and it performed well.

关键词： Oil products pipeline Schedulingoptimization Linear programming (LP) modelAnt colony optimization algorithm (ACO) Simplex method (SM)

甘肃北山新场深部地下水中铀的赋存形态及其影响因素的地球化学模拟研究

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原子能科学技术 2024年第5期58卷 1007-1016页

作者：吴鹏王驹凌辉周志超段佳欣李南段先哲南华大学资源环境与安全工程学院湖南衡阳421001 稀有金属矿产开发与废物地质处置技术湖南省重点实验室湖南衡阳421001 核工业北京地质研究院北京100029 国家原子能机构高放废物地质处置创新中心北京100029

核能的快速发展产生了大量的高水平放射性废物(简称高放废物),对生态环境和人类健康构成了巨大的威胁,其安全处置已成为国际放射性废物管理的重难点问题。深部地质处置被普遍认为是高放废物最安全可靠、技术上非常可行的处置方法。目前... 详细信息

核能的快速发展产生了大量的高水平放射性废物(简称高放废物),对生态环境和人类健康构成了巨大的威胁,其安全处置已成为国际放射性废物管理的重难点问题。深部地质处置被普遍认为是高放废物最安全可靠、技术上非常可行的处置方法。目前,我国已启动了甘肃北山新场高放废物地质处置地下实验室的建设,放射性元素铀在深部地下水中的形态分布及其影响因素从微观层面能为北山深地质处置性能评价提供基础数据,但尚不明晰,亟需开展相关地球化学模拟研究。基于PHREEQC中的***数据库,添加NEA-TDB和ThermoChimie数据库中U(Ⅵ)的热力学数据,使用地球化学模拟软件PHREEQC.v3和PhreePlot.v11对铀在我国甘肃北山新场高放废物地质处置地下实验室场址BS28孔深部地下水中的赋存形态及分布进行了模拟计算,旨在厘清铀在北山深部地下水中的赋存形态,探讨pH、pE以及Ca^(2+)与HCO_(3)^(-)浓度比对铀在北山深部地下水中形态分布的影响。模拟结果表明,在该深部地下水环境下,铀主要以六价的形式存在,Ca_(2)UO_(2)(CO_(3))_(3)(aq)和CaUO_(2)(CO_(3))_(3)^(2-)是主要的赋存形态,其占比分别为84.14%和15.16%。受氧化还原氛围的影响,铀的价态在pE<1时逐渐由U(Ⅵ)转变为U(Ⅳ),且在pE=-1~1时,UO_(2)(s)和可溶性碳酸铀酰络合物可同时存在。Ca^(2+)与HCO_(3)^(-)的浓度比低倾向于形成CaUO_(2)(CO_(3))_(3)^(2-),浓度比高易于形成Ca_(2)UO_(2)(CO_(3))_(3)(aq)。Ca^(2+)-UO_(2)^(2+)-CO_(3)^(2)三元体系很大程度上会影响铀在北山深部地下水的溶解度和迁移能力。本研究结果将有助于查明铀在北山花岗岩裂隙中的迁移和吸附机理。

关键词：高放废物铀赋存形态深部地下水地球化学模拟甘肃北山新场

Surface functionalized Pt/SnNb_(2)O_(6)nanosheets for visible-light-driven the precise hydrogenation of furfural to furfuryl alcohol

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Journal of Energy Chemistry 2022年第3期31卷 566-575,I0015页

作者： Yingzhang Shi Huan Wang Zhiwen Wang Cheng Liu Mingchuang Shen Taikang wu ling wu State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116FujianChina State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of ScienceFuzhou 350002FujianChina

Photocatalytic upgrading of renewable biomass is a promising way to relieve energy crisis and environmental ***,low photocatalytic efficiency and uncontrollable selectivity still limit its ***,ultrathin SnNb_(2)O_(6)nanosheets with high dispersed Pt nanoparticles(Pt/SN)were successfully developed as an efficient photocatalyst for the precise hydrogenation of furfural(FUR)to furfuryl alcohol(FOL)under visible light irradiation and exhibited the high conversion of FUR(99.9%)with the high selectivity for FOL(99.9%).It was revealed that SN with only 4.1 nm thickness possess good separation ability of photo-generated carriers and abundant surface Lewis acid sites(Nb^(5+))which would selectively chemisorb and activate FUR molecules via the Nb···O=C ***,Pt nanoparticles would gather photo-generated electrons for greatly promoting the generation of active H species to support the hydrogenation of FUR to *** synergistic effects between SnNb_(2)O_(6)nanosheets and Pt nanoparticles remarkably facilitate the photocatalytic performance for *** work not only confirms the great potential of ultrathin nanosheet photocatalyst with functional metal sites for precise upgrading of biomass but also provides an in-depth view to understand the surface/interface interaction between reactant molecules and surface sites of a photocatalyst.

关键词： Biomass conversion Hydrogenation of furfural Two-dimensional materials Sn2NbO6 nanosheet Pt nanoparticle Photocatalysis

Effects of heavy metals Cd^(2+),Pb^(2+)and Zn^(2+)on DNA damage of loach Misgurnus anguillicaudatus

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Frontiers in Biology 2008年第1期3卷 50-54页

作者： Yingmei zhang Yejing WANG Runliu yu Sheng zhang Zhenbin wu School of Life Sciences Lanzhou UniversityLanzhou 730000China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiologythe Chinese Academy of ScienceWuhan 430072China

The effects of heavy metals Cd^(2+),Pb^(2+)and Zn^(2+)at 0.05,0.5 and 5.0 mg/L level and their interactions at 0.5 mg/L level on DNA damage in hepatopancreas of loach Misgurnus anguillicaudatus for 1-35 days exposure were examined by single cell gel electrophoresis(SCGE).For each test group,20 loaches with similar body size(5.17-7.99 g;11.79-13.21 cm)were selected and kept in aquaria with dechlori-nated water at(22±1)℃and fed a commercial diet every 48 *** to the percentage of damaged DNA with tail and its TL/D(tail length to diameter of nucleus)value,the relationship between DNA damage degree and heavy metal dose and exposure time was *** showed that the percentage of damaged DNA and the TL/D value were increased with the prolonged exposure *** highest percentage(84.85%)of damaged DNA was shown in 5.0 mg/L Zn^(2+)group after 28 days exposure and the biggest TL/D value(2.50)in all treated groups after 35 days *** the first treated week,the damnification of DNA was mainly recognized as the first level,after that time,the third damaged level was mostly observed and the percentage of damaged DNA was beyond 80%.The joint toxic effects among Cd^(2+),Pb^(2+)or Zn^(2+)revealed much complexity,but it generally displayed that the presence of Cd^(2+)could enhance the genotoxicity of Pb^(2+)or Zn^(2+).In conclusion,the results suggestedthattherewasasignificanttime-anddose-depended relationship between the heavy metal and DNA damage in hepatopancreas of loach,and SCGE could represent a useful means to evaluate the genotoxicity of environmental contamination on aquatic organisms.

关键词： Misgurnus anguillicaudatus single cell gel electrophoresis(SCGE) heavy metals DNA damage

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基于知识图谱的可解释学习路径推荐

现代教育技术 2024年第7期34卷 131-141页

作者：熊余任朝辉吴超蔡婷秦新明重庆邮电大学人工智能与智慧教育研究中心重庆400065 重庆邮电大学通信与信息工程学院重庆400065

学习路径推荐是解决信息超载、学习迷航等问题的关键,但当前的学习路径推荐相关研究存在推荐方法脱离学习场景、推荐结果缺乏解释等问题。为此,文章构建了基于知识图谱的可解释学习路径推荐模型:首先利用邻域标定的图注意力网络表征知... 详细信息

学习路径推荐是解决信息超载、学习迷航等问题的关键,但当前的学习路径推荐相关研究存在推荐方法脱离学习场景、推荐结果缺乏解释等问题。为此,文章构建了基于知识图谱的可解释学习路径推荐模型:首先利用邻域标定的图注意力网络表征知识图谱语义信息并生成候选学习路径集,然后计算不同学习场景下学习者与候选学习路径之间的契合度和匹配度,最终实现可解释的学习路径推荐。之后,文章通过对基于知识图谱的可解释学习路径推荐模型与学习路径推荐基线模型进行对照实验和可解释案例分析,发现基于知识图谱的可解释学习路径推荐模型不仅提高了推荐结果的准确度,而且提升了推荐结果的可解释性。文章的研究有助于学习者获得准确、可解释的学习路径,从而提升个性化学习效果。

关键词：知识图谱学习路径推荐可解释性图注意力网络

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Research on Column FPN and Black Level Calibration in Large Array CMOS Image Sensor

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Chinese Journal of Electronics 2021年第2期30卷 268-274页

作者： GUO Zhongjie yu Ningmei wu Longsheng School of Automation and Information Engineering Xi'an University of Technology Xi'an Microelectronic Technology Institute

A technical investigation, research and implementation is presented to correct column fixed pattern noise and black level in large array Complementary metal oxide semiconductor(CMOS) image sensor. Through making a comparison among reported solution, and give large array CMOS image sensor design and considerations,according to our previous analysis on non-ideal factor and error source of piecewise Digital to analog converter(DAC) in multi-channels, an improving accurate piecewise DAC with adaptive switch technique is developed. The research theory has verified by a high dynamic range and low column Fixed pattern noise(FPN) CMOS image sensor prototype chip, which consisting of 8320×8320 pixel array was designed and fabricated in 55 nm CMOS 1P4M standard process. The chip active area is 48 mm×48 mm with a pixel size of 5.7μm×5.7μm. The measured results achieved a high intrinsic dynamic range of 75 d B, a low FPN and black level of 0.06%, a low photo response non-uniformity of 1.5% respectively, and an excellent raw sample image taken by the prototype sensor.

关键词： Image detectors, convertors, and intensifiers CMOS integrated circuits Image sensors CMOS image sensor Column FPN Readout chain DAC