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Optimizing electronic structure of Mo_(2)TiC_(2)T_(x) MXene through Nb doping for enhanced electrochemical performance

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Nano research 2024年第8期17卷 7174-7181页

作者： Jingyuan Zhao Wenzheng Yan Zhaoxi liu xiaobin liu Yapeng Tian Xinwei Cui Henan Institute of Advanced Technology College of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450003China College of Physics and Electronic Information Engineering Guilin University of TechnologyGuilin 514004China

MXene is a promising electrode material for both high volumetric capacitance and high-rate performance in ***,the current study has mainly focused on the monometallic element Ti_(3)C_(2)T_(x) MXene until now,while the bimetallic and multimetallic MXene have received comparatively less *** this work,we demonstrate that the electronic structure of the Mo_(2)TiC_(2)T_(x) MXene could be regulated by fine-tuning the content of doped Nb *** enhanced electron cloud density of surface–O termination and the electron spin of the Mo atoms in the Mo_(2)TiC_(2)T_(x) MXene,leads to the boost of electric double-layer capacitor(EDLC)and improvement of *** a consequence,the electrochemical performance of Nb-doped Mo_(2)TiC_(2)T_(x) MXene(Nb-0.3-MXene)demonstrates a capacitance of 398 F·cm^(−3),roughly doubling that of the pristine Mo_(2)TiC_(2)T_(x) MXene electrode at 197 F·cm^(−3) in the 3 M H_(2)SO_(4) *** the same time,the Nb-0.3-MXene could even maintain a capacitance of 82.75% at 200 mV·s−1,with high cyclic stability for 19,000 cycles at 10 A·g−***,Nb-0.3-MXene-based hybrid supercapacitors deliver a remarkable volumetric energy density of 48.1 W·h·L^(−1)at 230.7 W·L^(−1),and 34.4 W·h·L^(−1)at a high power density of 82.6 kW·L^(−1).There exists a balance between the volumetric capacitance and rate performance with different ratios of Nb atoms in the Nb-doped MXene due to the strong interaction between the Nb-doped MXene and the intercalated ***,optimizing the electronic structure of MXene through heteroatom doping is of great potential for enhanced supercapacitor performance.

关键词： niobium doping electronic structure Mo_(2)TiC_(2)T_(x)MXene electron spin rate performance volumetric capacitance

CdTe QDs@SiO2 composite material for efficient photocatalytic degradation of tetracycline composites

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Green Chemical Engineering 2024年第4期5卷 533-542页

作者： Taihang Zhou Fen Qiao Sen Qian Shoaib Muhammad haitao Li Yanzhen liu School of Energy & Power Engineering Jiangsu University Institute for Energy research Jiangsu University

In the contemporary context,tetracycline is widely utilized as a prevalent antibiotic in various facets of ***,the excessive use of antibiotics has caused visible environmental ***,the scientific community has increasingly focused on developing catalysts that exhibit exceptional efficacy in the prof.cient degradation of *** this study,a novel nanomaterial was developed to encapsulate Cd Te quantum dots （QDs） with a *** distinct synthesis approach generated a composite material that showed heterogeneity and considerably increased the contact area with ***,the transfer of photoelectron to the SiO2spheres was significantly improved,leading to a more efficient separation during the catalytic *** study investigated how different factors,such as the loading of the catalyst,the initial concentration of tetracycline,p H levels,and the wight ratio of Cd Te QDs （SiO2+Cd Te QDs） affected the effectiveness of photocatalytic tetracycline *** findings indicated that the optimal degradation efficiency was observed at a catalyst concentration of 0.25 g/L and a solution p H of 9,leading to an impressive degradation rate of 96%within a mere 2 h timeframe.

关键词： Photocatalysis Silica-based catalyst Photocatalytic degradation Photocatalytic mechanism

Engineering hydrophobic protective layers on zinc anodes for enhanced performance in aqueous zinc-ion batteries

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Journal of Energy Chemistry 2024年第10期97卷 1-11,I0001页

作者： Taofeng Li Suxia Yan Hongyu Dong Yang Zheng Kun Ming Ying Chen haitao Li Guochun Li Zhixia He Weimin Li Quan Wang Xiaohui Song Junfeng liu Edison Huixiang Ang Yong Wang Institute for Energy research Jiangsu UniversityZhenjiang 212013jiangsuChina Natural Sciences and Science Education National Institute of EducationNanyang Technological UniversitySingapore 63766Singapore School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Shenzhen Cllege of Advanced Technology University of Chinese Academy of SciencesShenzhen 518055GuangdongChina Shandong Zhongke Advanced Technology Co. LtdJinan 250101ShandongChina School of Materials Science and Engineering HefeiUniversity of TechnolgyHefei230009AnhuiChi

Aqueous zinc-ion batteries possess substantial potential for energy storage applications;however,they are hampered by challenges such as dendrite formation and uncontrolled side reactions occurring at the zinc *** our investigation,we sought to mitigate these issues through the utilization of in situ zinc complex formation reactions to engineer hydrophobic protective layers on the zinc anode *** robust interfacial layers serve as effective barriers,isolating the zinc anode from the electrolyte and active water molecules and thereby preventing hydrogen evolution and the generation of undesirable ***,the presence of numerous zincophilic sites within these protective layers facilitates uniform zinc deposition while concurrently inhibiting dendrite *** comprehensive evaluation of functional anodes featuring diverse functional groups and alkyl chain lengths,we meticulously scrutinized the underlying mechanisms influencing performance *** analysis involved precise modulation of interfacial hydrophobicity,rapid Zn^(2+)ion transport,and ordered deposition of Zn^(2+)***,the optimized anode,fabricated with octadecylphosphate(OPA),demonstrated exceptional performance *** Zn//Zn symmetric cell exhibited remarkable longevity,exceeding 4000 h under a current density of 2 mA cm^(-2)and a capacity density of 2 mA h cm^(-2),Furthermore,when integrated with a VOH cathode,the complete cell exhibited superior capacity retention compared to anodes modified with alternative organic molecules.

关键词： Aqueous zinc-ion batteries Hydrophobic protective layers Zinc anode stability Dendrite growth inhibition Energy storage

Vacuum degree effects on betavoltaics irradiated by ^(63)Ni with differently apparent activity densities

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Science china(Technological Sciences) 2017年第2期60卷 282-288页

作者： liu YunPeng xu ZhiHeng WANG Hao TANG xiaobin Department of Nuclear Science and Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China jiangsu Key Laboratory of Material and Technology for Energy Conversion Nanjing 210016 China

For many current betavoltaics, beta sources and PN junction energy conversion units are separated. The air gap between the two parts could stop part of decay beta particles, which results in inefficient performance of the betavoltaic. By employing 63Ni with an apparent emission activity density of 7.26×10~7 and 1.81×10~8 Bq cm^(-2), betavoltaic performance levels were calculated at a vacuum degree range of 1×10~5 to 1×10^(-1) Pa and measured at 1.0×10~5 and 1.0×10~4 Pa, respectively. Results show that betavoltaic performance levels improve significantly as the vacuum degree increases. The maximum output power (P_(max)) exhibits the largest change, followed by short-circuit current (I_(sc)), open-circuit voltage (V_(oc)), and fill factor. The vacuum degree effects on Isc, Voc,and Pmax of the betavoltaic with low apparent activity density 63Ni are more significant than those of the betavoltaic with high apparent activity density ^(63)Ni. Moreover, the improved efficiencies of the measured performances are larger than the calculated efficiencies because of the low ratio of Isc and reverse saturation current (I_0). The values of I0, ideality factor, and shunt resistance were estimated to modify the equivalent circuit model. The calculation results based on this model are closer to the measurement results. The results of this research can provide a theoretical foundation and experimental reference for the study of vacuum degree effects on betavoltaics of the same kind.

关键词： vacuum degree betavoltaic apparent activity density energy conversion unit MCNP5

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宏观社会工作如何更好地参与老年健康服务?

中国全科医学 2024年第13期27卷 1645-1650,1660页

作者：刘海桃顾东辉高海珍复旦大学社会发展与公共政策学院上海市200433 西北农林科技大学人文与社会发展学院陕西省咸阳市712100

背景随着社会老龄化的加剧,老年健康对社会工作专业及其服务的期待与需求增多,当前社会工作参与老年健康服务仍聚焦在微观层面——对服务对象的改变,在促进环境改变和倡导政策等宏观层面的服务不足,即宏观社会工作视角的研究较弱。目的... 详细信息

背景随着社会老龄化的加剧,老年健康对社会工作专业及其服务的期待与需求增多,当前社会工作参与老年健康服务仍聚焦在微观层面——对服务对象的改变,在促进环境改变和倡导政策等宏观层面的服务不足,即宏观社会工作视角的研究较弱。目的通过学理分析和实地调研,探索宏观社会工作在老年健康领域的模式与实务,为其参与老年健康服务提供科学依据。方法于2021年3—7月研究者进入上海市J社会工作专业机构进行田野调研,实证资料的收集主要通过参与式观察与半结构访谈2种方式进行。研究对象的抽取以立意抽样为原则,通过对包括5名机构管理者和社会工作者,16名上海市的认知障碍患者家属共21名研究对象展开访谈,基于发展型社会政策与福利分工理论制定访谈提纲。采用类型法将社会工作者在老年健康服务领域的临床与宏观实务进行分类,并运用NVivo 11软件对访谈内容进行编码与归类,结合理论与实证数据,探索老年健康服务中的宏观社会工作实务。结果本研究共访谈21名认知障碍相关的人员,涵盖了老年健康服务的提供者与使用者。结果表明理解宏观社会工作的价值观、理解问题和服务人群、推进改变作为场域的社区、改变系统方法、健康政策与福利等,能够为老年群体提供精准的系统服务,丰富宏观社会工作的服务内容,促进老年健康服务环境的变化。结论宏观社会工作能够促进和改变环境,为老年健康提供更好的福祉。健康社会工作的发展需要卫健委、民政部等多部门的协同发展,并将临床社会工作与宏观社会工作智慧汇聚于老年健康服务,共同推进老年健康服务的高质量发展。

关键词：社会工作社会工作者宏观社会工作老年健康发展型社会政策福利分工理论

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Type Synthesis of 1T2R Parallel Mechanisms Using Structure Coupling-Reducing Method

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Chinese Journal of Mechanical Engineering 2019年第5期32卷 70-79页

作者： haitao liu Ke xu Huiping Shen Xianlei Shan Tingli Yang Key Laboratory of Mechanism Theory and Equipment Design Ministry of EducationTianjin UniversityTianjin 300350China School of Mechanical Engineering Changzhou UniversityChangzhou 213164China

Direct kinematics with analytic solutions is critical to the real-time control of parallel ***,the type synthesis of a mechanism having explicit form of forward kinematics has become a topic of *** on this purpose,this paper deals with the type synthesis of 1T2R parallel mechanisms by investigating the topological structure coupling-reducing of the 3UPS&UP parallel *** the aid of the theory of mechanism topology,the analysis of the topological characteristics of the 3UPS&UP parallel mechanism is presented,which shows that there are highly coupled motions and constraints amongst the limbs of the *** methods for structure coupling-reducing of the 3UPS&UP parallel mechanism are proposed,resulting in eight new types of 1T2R parallel mechanisms with one or zero coupling *** obtained parallel mechanism is taken as an example to demonstrate that a mechanism with zero coupling degree has an explicit form for forward *** process of type synthesis is in the order of permutation and combination;therefore,there are no *** method is also appli cable to other configurations,and novel topological structures having simple forward kinematics can be obtained from an original mechanism via this method.

关键词： Type synthesis Structure coupling-reducing Coupling degree Parallel mechanism

An interdigitated impedance microsensor for detection of moisture content in engine oil

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Nanotechnology and Precision Engineering 2020年第2期3卷 75-80页

作者： haitao liu Xiecheng Tang Hao lu Wenguang Xie Yanmin Hu Qiannan xue State Key Laboratory of Precision Measuring Technology and Instruments School of Precision Instruments and Optoelectronics EngineeringTianjin UniversityTianjin 300072China Sino-European Institute of Aviation Engineering Civil Aviation University of ChinaTianjin 300300China College of Electronic Information and Automation Civil Aviation University of ChinaTianjin 300300China Civil Aircraft Airworthiness Certification Technology Key Laboratory of Tianjin Civil Aviation University of ChinaTianjin 300300China

To address the need for the on-site measurement of aging oil, in this paper, we propose an impedance-based microsensor for analyzing the moisture content in engine oil. Using a microfabrication process, we fabricated an interdigitated microelectrode and integrated it with a 3 D-printed microcontainer to produce a microsensor that can detect changes in the permittivity of oil. When the moisture content in oil increases, this sensor can detect the resulting change in the oil impedance, which is related to its permittivity, and then determine the degree to which the oil has aged. The test results show that the proposed microsensor has the advantages of being small and having high sensitivity, good accuracy, and the ability to be combined with hand-held *** proposed method is expected to be used for the rapid, low cost, on-site determination of oil aging.

关键词： Complex permittivity Oil detection Microsensor Moisture content Impedance sensor

VT3D:a visualization toolbox for 3D transcriptomic data

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Journal of Genetics and Genomics 2023年第9期50卷 713-719页

作者： Lidong Guo Yao Li Yanwei Qi Zhi Huang Kai Han xiaobin liu Xin liu Mengyang xu Guangyi Fan College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China BGI-Qingdao BGI-ShenzhenQingdaoShandong 266555China BGI-Shenzhen ShenzhenGuangdong 518083China State Key Laboratory of Agricultural Genomics BGI-ShenzhenShenzhenGuangdong 518083China

Data visualization empowers researchers to communicate their results that support scientific reasoning in an intuitive ***-dimension(3D)spatially resolved transcriptomic atlases constructed from multi-view and high-dimensional data have rapidly emerged as a powerful tool to unravel spatial gene expression patterns and cell type distribution in biological samples,revolutionizing the understanding of gene regulatory interactions and cell ***,limited accessible tools for data visualization impede the potential impact and application of this *** we introduce VT3D,a visualization toolbox that allows users to explore 3D transcriptomic data,enabling gene expression projection to any 2D plane of interest,2D virtual slice creation and visualization,and interactive 3D data browsing with surface model *** addition,it can either work on personal devices in standalone mode or be hosted as a web-based *** apply VT3D to multiple datasets produced by the most popular techniques,including both sequencing-based approaches(Stereo-seq,spatial transcriptomics,and Slide-seq)and imaging-based approaches(MERFISH and STARMap),and successfully build a 3D atlas database that allows interactive data *** demonstrate that VT3D bridges the gap between researchers and spatially resolved transcriptomics,thus accelerating related studies such as embryogenesis and organogenesis *** source code of VT3D is available at https://***/BGI-Qingdao/VT3D,and the modeled atlas database is available at http://***/vt3d_example.

关键词： Spatially resolved transcriptomics Stereo-seq Spatial transcriptomics MERFISH 3D visualization Data sharing Virtual slice

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防风中1个新多糖的结构及免疫调节活性研究

中草药 2024年第4期55卷 1089-1099页

作者：何新阳范海涛孙萌李洁夏青姜艳艳刘斌北京中医药大学中药学院北京电子科技职业学院生物工程学院齐鲁工业大学(山东省科学院)生物研究所国家中医药管理局“中药经典名方有效物质发现”重点研究室

目的对防风Saposhnikovia divaricata中分离得到均一多糖的结构及其免疫调节活性进行研究。方法采用DEAE-纤维素、Sephadex G-75等柱色谱法，对防风多糖进行系统分离纯化，采用ESI-MSn、GC-MS、NMR等谱学技术，对分离得到的防风多糖SP... 详细信息

目的对防风Saposhnikovia divaricata中分离得到均一多糖的结构及其免疫调节活性进行研究。方法采用DEAE-纤维素、Sephadex G-75等柱色谱法，对防风多糖进行系统分离纯化，采用ESI-MSn、GC-MS、NMR等谱学技术，对分离得到的防风多糖SP800203的相对分子质量分布、单糖组成、寡糖片段、糖残基类型和糖苷键连接方式等进行分析，确定其结构。采用细胞实验和斑马鱼实验，研究防风多糖SP800203的免疫调节活性。结果从防风中分离得到防风多糖SP800203，糖醛酸质量分数为75.73%，相对分子质量约为7.14×104，由鼠李糖、半乳糖、阿拉伯糖和半乳糖醛酸组成，单糖物质的量比为2.8∶6.7∶6∶84.5。主链由半乳糖醛酸聚合而成，2条支链分别由阿拉伯糖、半乳糖醛酸、半乳糖、鼠李糖，以及阿拉伯糖、半乳糖醛酸、半乳糖聚合而成，二者分别通过β、α糖苷键与主链相连。防风多糖SP800203可以促进巨噬细胞一氧化氮、肿瘤坏死因子-α、白介素-1β和白介素-6的释放，增加斑马鱼的免疫细胞密度和巨噬细胞数量。结论防风多糖SP800203为从防风中分离得到的新的均一多糖，具有良好的免疫调节活性；研究结果为阐明防风免疫调节作用机制奠定了基础，为防风临床应用及进一步研究与开发提供科学依据。

关键词：防风多糖结构表征免疫调节半乳糖醛酸鼠李糖半乳糖阿拉伯糖