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Antimicrobial and antifouling surfaces through polydopamine bio-inspired coating

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Rare Metals 2022年第2期41卷 499-518页

作者： yi-Wen Zhu Yu-Jie sun ju-Lin Wang Bing-Ran Yu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Biomedical Materials of Natural Macromolecules Ministry of EducationBeijing University of Chemical TechnologyBeijing 100029China Laboratory of Biomedical Materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Laboratory of Electrochemical Process and Technology for Materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

The increasing antibiotic treatment failure is attributed to the increasing emergence of drug-resistant bacteria,and the attachment of these bacteria to the surface of implantation materials often leads to dangerous bacterial biofilm formation on the implant ***,this creates an urgent need to develop new antibacterial material and antifouling ***(PDA),as a musselinspired material,has many advantageous properties,such as a simple preparation procedure,excellent hydrophilicity and biocompatibility,strong adhesive performance,easy functionalization,outstanding photothermal conversion effect,and strong quenching *** has increasingly attracted much interest not only for its adherence to virtually all types of surfaces but also as it provides a simple and versatile approach to functionalize material surfaces to obtain a variety of multifunctional *** this review,we mainly focus on the preparation and polymerization mechanism of PDA systems and then provide a compilation of several reports on the PDA surface modification of various nanomaterials and material surfaces,including metals,metal oxides,carbons,and ***,we summarize the advantages and disadvantages of polydopamine surface-modified nanomaterials.

关键词： Polydopamine(PDA) Adhesion Modification Antibacterial Antifouling

整合EVE-NG、GNS3及HCL搭建多厂商网络仿真实验平台

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新疆师范大学学报（自然科学版） 2025年第2期44卷 1-7,19页

作者：孙光懿天津音乐学院网络安全和信息化办公室天津300171

文章针对EVE-NG、GNS3仿真平台主要仿真思科设备,HCL仿真平台只能仿真H3C设备,而实际工程项目往往涵盖多厂商设备的问题,探讨将EVE-NG、GNS3、HCL等网络模拟器通过与本地物理网卡桥接的方法进行整合,搭建集成多厂商设备,可用于实际网络... 详细信息

文章针对EVE-NG、GNS3仿真平台主要仿真思科设备,HCL仿真平台只能仿真H3C设备,而实际工程项目往往涵盖多厂商设备的问题,探讨将EVE-NG、GNS3、HCL等网络模拟器通过与本地物理网卡桥接的方法进行整合,搭建集成多厂商设备,可用于实际网络工程项目的网络仿真实验平台。文章不仅给出了上述三款网络模拟器桥接整合的基本原理,还给出了与本地物理网卡的具体桥接过程。测试后证实,整合后的网络仿真实验平台可兼容模拟多厂商网络设备运行。

关键词： EVE-NG GNS3 HCL Pemu Dynamips

TiO_(2)-coated LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)cathode materials with enhanced cycle performance for Li-ion batteries

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Rare Metals 2021年第7期40卷 1719-1726页

作者： Wei-Wei Li Xiang-jun Zhang Jiang-ju Si Jie Yang Xue-yi sun College of Chemistry and Chemical Engineering Xinxiang UniversityXinxiang 453003China R&D Centre for Vehicle Battery and Energy Storage General Research Institute for Nonferrous MetalsBeijing 100088China

Ni-rich cathode material is one of the most promising materials for Li-ion batteries in electric ***,fading capacity,poor cyclic stability and high p H value are still major challenges,which suppress its practical *** this study,spherical LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)powders with 0.4 wt%TiO_(2)coating layer were prepared by impregnation-hydrolysis *** electron microscopy(SEM),high-resolution transmission electron microscopy(HRTEM)and X-ray diffraction(XRD)results show that TiO_(2)is uniformly coated on the surface of LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)particle and slightly embedded into LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)*** 100 cycles at 2.0 C,0.4 wt%TiO_(2)-coated LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)electrode delivers much higher discharge capacity retention(77.0%)than the pristine LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)electrode(63.3%).The excellent cycling performance of 0.4 wt%Ti O_(2)-coated LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)electrode at a high discharge ratio is due to a TiO_(2)coating layer which can effectively reduce the direct contact between cathode material and electrolyte,suppress the oxidation of electrolyte,improve electrical conductivity of the electrode and increase the stability of the structure.

关键词： Li-ion batteries Cathode materials TiO_(2) LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2) Enhanced cycle performance

敦煌三危山出产多色颜料的矿物学及谱学特征研究

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光谱学与光谱分析 2025年第1期45卷 152-159页

作者：李林筱谭宇辰先怡衡铁付德孙满利艾昊梁云孙凤西北大学文化遗产学院陕西西安710127 中国国家博物馆北京100006

敦煌三危山火焰沟发现一处古代多色颜料开采遗址,该遗址的发现对研究我国西北地区古代矿物颜料的来源有着一定的学术意义。为判断三危山出产颜料的矿物种属及其谱学特征,本文应用偏光显微镜、X射线衍射、激光拉曼光谱、X射线荧光光谱多... 详细信息

敦煌三危山火焰沟发现一处古代多色颜料开采遗址,该遗址的发现对研究我国西北地区古代矿物颜料的来源有着一定的学术意义。为判断三危山出产颜料的矿物种属及其谱学特征,本文应用偏光显微镜、X射线衍射、激光拉曼光谱、X射线荧光光谱多种光谱分析手段对所出产多色颜料矿物开展科学分析。结果表明,三危山古矿出产矿物颜料属天然矿物,主要化学成分为Fe_(2)O_(3)(平均含量66%)和SiO_(2)等,部分样品呈现富硅铝的特征,且均存在不同程度的烧失;主要物相以赤铁矿、针铁矿为主,少许铁矾类,脉石矿物包括石英、高岭石及少许黏土矿物。同时进一步通过拉曼光谱对矿物颜料的显色物相进行分析,2号亮黄色矿物显色物相和前述主要物相一致,均为铁矾类(黄钾铁矾和黄钠铁矾)。除4号样品外,所有呈红棕色的样品主要显色物相均为α-Fe_(2)O_(3)即赤铁矿,而4号样品显色物相为针铁矿,呈色本应为黄色,但致其呈色变为红棕色是由于和赤铁矿伴生存在,且赤铁矿显色能力远强于针铁矿,故改变了4号样品的呈色。综上,该古矿遗址所出产的红色矿物颜料主要为赤铁矿,黄色矿物颜料为黄钾铁矾和黄钠铁矾。黄钾铁矾作为优良的颜料,在岩画及壁画也多有使用,但在莫高窟目前已研究的壁画上暂未发现使用,三危山古矿实证了铁矾类颜料矿物的存在,该发现在一定程度上拓宽了对西北地区黄色矿物颜料的维度。同时也为后续研究该矿冶遗址出产颜料的流向,提供了基础性的数据支撑。

关键词：敦煌采矿遗址矿物颜料呈色拉曼光谱

Nonreciprocal two-photon transmission and statistics in a chiral waveguide QED system

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Chinese Physics B 2022年第5期31卷 340-349页

作者： Lei Wang Zhen yi Li-Hui sun Wen-ju Gu School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China

We study the nonreciprocal properties of transmitted photons in a chiral waveguide quantum electrodynamics(QED)system,including single-and two-photon transmissions and second-order *** the single-photon transmission,the nonreciprocity is induced by the effects of chiral coupling and atomic dissipation in the weak coupling *** vanishes in the strong coupling regime when the effect of atomic dissipation becomes *** the case of two-photon transmission,there exist two ways of going through the emitter:independently as plane waves and formation of bound *** the nonreciprocal behavior of plane waves,the bound state that differs in two directions also alters transmission *** addition,the second-order correlation of transmitted photons depends on the interference between plane wave and bound *** destructive interference leads to the strong antibunching in the weak coupling region,while the effective formation of bound state leads to the strong bunching in the intermediate coupling ***,the negligible interactions for left-propagating photons hardly change the statistics of the input coherent state.

关键词： chiral waveguide QED nonreciprocal transmissions nonreciprocal correlations

The Functional Redundancy of Neddylation E2s and E3s in Modulating the Fitness of Regulatory T Cells

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Research 2024年第2期2023卷 373-387页

作者： Di Wu yi sun Cancer Institute(Key Laboratory of Cancer Prevention and Intervention China National Ministry of Education)of the Second Affiliated Hospital and Institute of Translational MedicineZhejiang University School of MedicineHangzhou 310029China Cancer Center of Zhejiang University Hangzhou 310029China Zhejang Provincial Clinical Research Center for Cancer Zhejang ProvinceChina Key Laboratory of Molecular Biology in Medical Sciences Zhejang ProvinceChina Research Center for Life Science and Human Health Binjiang Institute of Zhejiang UniversityHangzhou 310053China

Neddylation is necessary for activation of Cullin-RING ligases(CRLs),which degrade various immune regulatory *** recent study showed that while depletion of neddylation E2-E3 pair Ube2f-Sag in regulatory T(T_(reg))cells had no obvious phenotype,the same depletion of either Ube2m or Rbx1 caused inflammation disorders with different *** these E2s or E3s compensate each other in functional regulations of T_(reg)cells is,however,previously *** this report,we generated Foxp3^(Cre);Ube2m^(fl/fl);Ube2f^(fl/fl)or Foxp3^(Cre);Rbx1^(fl/fl);Sag^(fl/fl)double-null mice by simultaneous deletion of both neddylation E2s or E3s in T_(reg)cells,***,Ube2m&Ube2f double-null mice developed much severe autoimmune phenotypes than did Ube2m-null mice,indicating that Ube2m markedly compensates Ube2f in T_(reg)*** minor worsened autoimmune phenotypes seen at the very early stage in Rbx1&Sag double-null than Rbx1-null mice is likely due to already severe phenotypes of the later,indicating a minor compensation of Rbx1 for *** RNA profiling-based analyses revealed that up-and down-regulations of few signaling pathways in T_(reg)cells are associated with the severity of autoimmune ***,severer inflammation phenotypes seen in mice with double E3-null than with double E2-null T_(reg)cells indicate a neddylation-independent mechanism of 2 E3s,also known to serve as the RING component of CRLs in regulation of T_(reg)cell fitness.

关键词： Foxp3 inflammation markedly

A Survey of Voltage-Controlled-Oscillator-Based ?∑ ADCs

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Tsinghua Science and Technology 2022年第3期27卷 472-480页

作者： yi Zhong Nan sun Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering The University of Texas at AustinAustinTX 78712USA

The benefits of technology scaling have fueled interest in realizing time-domain oversampling(?∑) of Analog-to-Digital Converters(ADCs). Voltage-Controlled Oscillators(VCO) are increasingly used to design ?∑ADCs because of their simplicity, high digitization, and low-voltage tolerance, making them a promising candidate to replace the classical Operational Transconductance Amplifier(OTA) in ?∑ ADC design. This work aims to provide a summary of the fully VCO-based ?∑ ADCs that are highly digital and scaling-friendly. This work presents a review of first-order and high-order VCO-based ?∑ ADCs with several techniques and architectures to mitigate the nonidealities introduced by VCO, achieving outstanding power efficiency. The contributions and drawbacks of these techniques and architectures are also discussed.

关键词： Voltage-Controlled Oscillator(VCO) Analog-to-Digital Converter(ADC) oversampling(?∑)ADC time-domain signal processing VCO-based?∑ADC

Ni-doped ZnCo2O4 atomic layers to boost the selectivity in solar-driven reduction of CO2

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Nano Research 2018年第6期11卷 2897-2908页

作者： Katong Liu Xiaodong Li Liang Liang ju Wu Xingchen Jiao Jiaqi Xu Yongfu sun yi Xie Hefei National Laboratory far Physical Sciences at Microscale CAS Center for Excellence in Nanoscience University of Science and Technology of China Hefei 230026 China

Regulating the selectivity of CO2 photoreduction is particularly challenging. Herein, we propose ideal models of atomic layers with/without element doping to investigate the effect of doping engineering to tune the selectivity of CO2 photoreduction. Prototypical ZnCo2O4 atomic layers with/without Ni-doping were first synthesized. Density functional theory calculations reveal that introducing Ni atoms creates several new energy levels and increases the density-of-states at the conduction band minimum. Synchrotron radiation photoemission spectroscopy demonstrates that the band structures are suitable for CO2 photoreduction, while the surface photovoltage spectra demonstrate that Ni doping increases the carrier separation efficiency. In situ diffuse reflectance Fourier transform infrared spectra disclose that the CO2^- radical is the main intermediate, while temperature-programed desorption curves reveal that the ZnCo2O4 atomic layers with/without Ni doping favor the respective CO and CH4 desorption. The Ni-doped ZnCo2O4 atomic layers exhibit a 3.5-time higher CO selectivity than the ZnCo2O4 atomic layers. This work establishes a clear correlation between elemental doping and selectivity regulation for CO2 photoreduction, opening new possibilities for tailoring solar-driven photocatalytic behaviors.

关键词： atomic layers Ni-doped zinc cobaltite selectivity of CO2 reduction

Tri-functionalized polypropylene separator by rGO/MoO_(2) composite for high-performance lithium–sulfur batteries

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Rare Metals 2021年第10期40卷 2810-2818页

作者： Kun Xu Xin Liang Lu-Lu Wang Yong Wang ju-Feng Yun yi sun Hong-Fa Xiang School of Materials Science and Engineering Engineering Research Center of High Performance Copper Alloy Materials and ProcessingMinistry of EducationHefei University of TechnologyHefei 230009China

The popularity of lithium–sulfur batteries has been increasing gradually due to their ultrahigh theoretical specific capacity and energy density. Nevertheless, they also have lots of drawbacks to be overcome, such as poor conductivity, severe volume expansion, and serious“shuttle effect”. In this work, reduced graphene oxide/molybdenum dioxide(rGO/MoO_(2)) composite is synthesized and applied to modify polypropylene separator. The modified polypropylene separator introduces synergistic tri-functions of physical adsorption, chemical interaction and catalytic effects, which can inhibit the“shuttle effect” and enhance the electrochemical performances of lithium-sulfur batteries. In the prepared r GO/MoO_(2) composite, the polar MoO_(2) chemically adsorbs the intermediate lithium polysulfide, while the rGO with good electrical conductivity not only acts as a physical barrier to prevent diffusion of polysulfide ions, but also improves the conversion efficiency of active material intercepted on the separator. As a consequence, the battery assembled with rGO/MoO_(2) modified polypropylene separator exhibits a reversible capacity of 757.5 mAh·g^(-1) after 200 cycles at0.2 C with a negligible capacity decay of 0.207% per cycle,which indicates a good long-period cycling stability. Furthermore, the rate performance and self-discharge suppression are also improved by introducing modified polypropylene separator. It shows that rGO/MoO_(2) composite is a promising material for separator modification in lithium-sulfur batteries.

关键词： rGO/MoO_(2)composite Li–S batteries Separator modification Shuttle effect