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Design of novel RGO/2D strip-like ZIF-8/DMAOP ternary hybrid structure towards high-efficiency microwave absorption, active and passive anti-corrosion, and synergistic antibacterial performance

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Nano Research 2024年第3期17卷 913-926页

作者： Tanlin chen Yingrui Tian Zihao Guo yao chen Qing Qi Fanbin meng Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Shenzhen Institute of Southwest Jiaotong University Shenzhen 518000China

In order to meet the requirements of the marine environment for microwave absorption(MA)materials,we put forward the strategy of constructing multi-functional composite materials,which integrate microwave absorption,anti-corrosion,and antibacterial ***,graphene oxide(GO)was used as a template to induce the growth of zeolitic imidazolate framework-8(ZIF-8),simultaneously as a two-dimensional(2D)nanocontainers to load corrosion inhibitors to achieve pH-responsive and self-healing ***,quaternary ammonium salt(dimethyl octadecyl(3-trimethoxylsilyl propyl)ammonium chloride(DMAOP))and sodium ascorbate(VCNa)were introduced to achieve synergistic antibacterial activity and the reduction of *** 2D strip-like structure of ZIF-8 was due to the confined growth induced by the electrostatic attraction between ZIF-8 and GO *** as-obtained reduced GO(RGO)/ZIF-8/DMAOP5 exhibited excellent microwave absorption(MA)properties,with a minimum reflection loss(RL)value of-47.08 dB at 12.73 GHz when the thickness was 2.8 ***,the effective absorption bandwidth reached 6.84 *** soaking in 3.5%NaCl solution for 35 days,the RGO/ZIF-8/DMAOP5-0.7%coating still achieved an impedance value of 4.585×107Ω·cm^(2) and a protective efficiency of 99.994%,providing superior anti-corrosion *** addition,fantastic antibacterial activity was obtained,with the antibacterial rates of RGO/ZIF-8/DMAOP_(10) reaching 99.39%and 100%against Escherichia coli and Staphylococcus *** work could open new avenues towards the development of a new generation of multifunctional MA materials.

关键词： two-dimensional(2D)strip-like zeolitic imidazolate framework-8(ZIF-8) microwave absorption active and passive anti-corrosion antibacterial

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基于Marx电路的固态高压脉冲电源设计

电力电子技术 2024年第2期58卷 11-13,74页

作者：李霄翔周洁敏洪峰陈梦瑶南京航空航天大学民航学院江苏南京211106 南京航空航天大学电子信息工程学院/集成电路学院江苏南京211106

针对高压脉冲放电和低温等离子体应用的要求,设计了一种基于Marx电路的高重复频率的固态高压脉冲发生装置。该脉冲电源利用Marx电路电容并联充电、串联放电的原理,选取绝缘栅双极型晶体管(IGBT)作为放电开关,控制电路的模态切换。Marx... 详细信息

针对高压脉冲放电和低温等离子体应用的要求,设计了一种基于Marx电路的高重复频率的固态高压脉冲发生装置。该脉冲电源利用Marx电路电容并联充电、串联放电的原理,选取绝缘栅双极型晶体管(IGBT)作为放电开关,控制电路的模态切换。Marx主电路由84级单元组成,每级单元包含IGBT开关管、快恢复二极管和储能电容。实验结果表明,在输入电压为480 V直流电压,并且在300 Hz的频率下,该电源可以产生幅值为20 kV、脉宽为500 ns的高压脉冲,满足设计要求。

关键词：高压脉冲电源绝缘栅双极型晶体管低温等离子体

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基于BP神经网络的共享单车需求预测研究

智能城市 2024年第5期10卷 25-28页

作者：陈梦瑶张思奇窦蕊杜纪萍赵阳源沈阳建筑大学辽宁沈阳110168

文章在以沈阳市铁西广场周围区域为案例,构建了基于反向传播(BP)神经网络的预测模型并选取案例区域的单车历史使用数据,使用Matlab软件对模型进行编程求解得到了案例区域未来各个时段的共享单车预测使用量。结果表明,基于BP神经网络的... 详细信息

文章在以沈阳市铁西广场周围区域为案例,构建了基于反向传播(BP)神经网络的预测模型并选取案例区域的单车历史使用数据,使用Matlab软件对模型进行编程求解得到了案例区域未来各个时段的共享单车预测使用量。结果表明,基于BP神经网络的预测模型可以应用于共享单车系统,为企业减少运营成本和提高服务水平提供技术和理论支撑。

关键词：共享单车需求预测 BP神经网络

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Pillar effect induced by ultrahigh phosphorous/nitrogen doping enables graphene/MXene film with excellent cycling stability for alkali metal ion storage

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Journal of Energy Chemistry 2024年第6期93卷 146-156,I0004页

作者： meng Qin Yiwei yao Junjie Mao Chi chen Kai Zhu Guiling Wang Dianxue Cao Jun Yan Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials and Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021FujianChina

Graphene's large theoretical surface area and high conductivity make it an attractive anode material for potassium-ion batteries(PIBs).However,its practical application is hindered by small interlayer distance and long ion transfer ***,this paper aims to address the issue by introducing MXene through a simple and scalable method for assembling graphene and realizing ultrahigh P doping *** findings reveal that MXene and P-C bonds have a "pillar effect" on the structure of graphene,and the P-C bond plays a primary *** addition,N/P co-doping introduces abundant defects,providing more active sites for K^(+) storage and facilitating K^(+) *** expected,the developed ultrahigh phosphorous/nitrogen co-doped flexible reduced graphene oxide/MXene(NPrGM) electrode exhibits remarkable reversible discharge capacity(554 mA hg^(-1) at 0.05 A g^(-1)),impressive rate capability(178 mA h g^(-1) at 2 A g^(-1)),and robust cyclic stability(0.0005% decay per cycle after 10,000 cycles at 2 A g^(-1)).Furthermore,the assembled activated carbon‖NPrGM potassium-ion hybrid capacitor(PIHC) can deliver an impressive energy density of 131 W h kg^(-1) and stable cycling performance with 98.1% capacitance retention after5000 cycles at 1 A g^(-1).Such a new strategy will effectively promote the practical application of graphene materials in PIBs/PIHCs and open new avenues for the scalable development of flexible films based on two-dimensional materials for potential applications in energy storage,thermal interface,and electromagnetic shielding.

关键词： Graphene MXene Phosphorous doping Pillar effect Potassium-ion batteries

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LLC谐振变换器数字控制技术研究

电力电子技术 2024年第3期58卷 108-112页

作者：王一民周洁敏陈梦瑶王冠文南京航空航天大学江苏东南京210016

LLC谐振变换器能够实现全负载范围的初级零电压开关(ZVS)和次级零电流开关(ZCS),因此得到关注。全桥LLC谐振电路可以通过改变初级开关管驱动脉冲频率调制(PFM)方法,调节LLC谐振腔的增益进行闭环控制,保证输出电压在输入电压变化大、不... 详细信息

LLC谐振变换器能够实现全负载范围的初级零电压开关(ZVS)和次级零电流开关(ZCS),因此得到关注。全桥LLC谐振电路可以通过改变初级开关管驱动脉冲频率调制(PFM)方法,调节LLC谐振腔的增益进行闭环控制,保证输出电压在输入电压变化大、不同负载条件下的输出稳定。LLC谐振增益曲线会随负载减轻而调节特性变差,单一PFM调节无法应对。研究集PFM、脉宽调制(PWM)和间歇工作模式(Burst模式)的混合控制方案,解决变换器从空载到满载不同工作条件下的控制方式,并在发生短路故障时变换器迅速保护。此处采用HPM6300系列芯片完成LLC数字控制和保护功能,设计系统的实验装置并编写应用软件。经过整机测试,实验结果表明所采用方案的有效性,并达到设计目标。

关键词：变换器脉冲频率调制脉宽调制

Research and Application of Joint Interpretation Using P-Wave and PS-Wave in Tight Gas Exploration

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Journal of Earth Science 2024年第4期35卷 1402-1406页

作者： Dong Wang meng Zhang Jing Wang Dan chen yao Zhao Jing Bai BGPInc. China National Petroleum CorporationZhuozhou 072751China Institute of Geophysics Chengdu University of TechnologyChengdu 610059China National Engineering Research Center of Oil and Gas Exploration Computer Software Zhuozhou 072751China

The exploration and development of tight sandstone gas reservoirs are controlled by high-quality river channel sand bodies on a large scale in Sichuan *** order to improve the accu-racy of sand body prediction and characterization,Multi-component exploration technology research has been carried out in Northwest Sichuan ***,based on the array acoustic logging data,a for-ward modeling has been established to analyze the seismic response characteristics of the PS-wave data and P-wave *** result shows that the response characteristics of the P-wave and PS-wave to the sand bodies with different impedance are *** then through the analysis of logging data,the effectiveness of the forward modeling has been *** the sandstone velocity is close to the sur-rounding rocks,the P-wave performs as a weak reflection,which may lead to reduce the identification range of the sand ***,the PS-wave exhibits strong reflection,which can identify this type of sand ***,by comparing and explaining the PS-wave data and P-wave data,and integrat-ing their attributes,the prediction accuracy of sand bodies is *** with the interpreta-tion of a single P-wave,the results can significantly expand the distribution range of sand bodies,lay-ing a foundation for improving the production capacity of single wells and reserve submission.

关键词： multi-component exploration tight gas sand body identification

Iterative Signal Detection Based Soft Interference Cancellation for Satellite-Terrestrial Downlink NOMA Systems

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China Communications 2024年第8期21卷 249-263页

作者： Sun meng Zhang Qi yao Haipeng Gao Ran Xin Xiangjun Tian Feng Feng Weiying chen Dong School of Electronic Engineering Beijing University of Posts and Telecommunications(BUPT)Beijing 100876China Beijing Key Laboratory of Space-Ground Interconnection and Convergence State Key Laboratory of Information Photonics and Optical CommunicationsSchool of Electronic EngineeringBeijing University of Posts and Telecommunications(BUPT)Beijing 100876China School of Information and Communication Engineering Beijing University of Posts and Telecommunications(BUPT)Beijing 100876China Beijing Institute of Technology Beijing 100081China Beihang University Beijing 100191China China Academy of Space Technology(CAST) Beijing 100094China

To improve the bit error rate(BER)performance of multi-user signal detection in satelliteterrestrial downlink non-orthogonal multiple access(NOMA)systems,an iterative signal detection algorithm based on soft interference cancellation with optimal power allocation is *** that power allocation has a significant impact on BER performance,the optimal power allocation is obtained by minimizing the average BER of NOMA *** to the allocated powers,successive interference cancellation(SIC)between NOMA users is performed in descending power *** each user,an iterative soft interference cancellation is performed,and soft symbol probabilities are calculated for soft *** improve detection accuracy and without increasing the complexity,the aforementioned algorithm is optimized by adding minimum mean square error(MMSE)signal estimation before detection,and in each iteration soft symbol probabilities are utilized for soft-decision of the current user and also for the update of soft interference of the previous *** results illustrate that the optimized algorithm ***-IDBSIC significantly outperforms joint multi-user detection and SIC detection by 7.57dB and 8.03dB in terms of BER performance.

关键词： non-orthogonal multiple access(NOMA) resource allocation satellite-terrestrial communication signal detection soft interference cancellation

Efficient removal of Cr(VI) by polydopamine-modified lignin from aqueous solution: Batch and XAFS studies

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Water Science and Engineering 2024年第1期17卷 51-61页

作者： Xiao-jie Guo Wei-kang Fu Jing-yuan Ma Bo-jun Xi chen Wang meng-yao Guan College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China College of Textile and Garment Shaoxing UniversityShaoxing 312000China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Lignocellulose has the potential to become a bio-based adsorbent due to its biodegradability and *** this study,a novel polydopamine functionalized-lignin(lignin@PDA),prepared via self-polymerization of dopamine(PDA)on lignin,was used as a bio-based adsorbent for rapid scavenging of hexavalent chromium(Cr(VI)).The morphology,functional groups,crystalline structure,and chemical composition of lignin@PDA were characterized with a scanning electron microscope-energy dispersive spectrometer,Fourier transform infrared spectroscopy,X-ray diffraction,and X-ray photoelectron *** Cr(VI)adsorption process of lignin@PDA was studied using batch experiments as a function of pH,ionic strength,adsorbent dose,and contact time at room *** adsorption rate of lignin@PDA was five times greater than that of the unmodified lignin,with a maximum adsorption capacity of 102.6 mg/g in an acidic *** adsorption of Cr(VI)on lignin@PDA fit the pseudo-secondorder equation and the Freundlich model,indicating that the adsorption process was mainly dominated by chemisorption and surface *** thermodynamic parameters showed that adsorption of Cr(VI)on lignin@PDA was an endothermic and spontaneous *** X-ray absorption fine structure results showed that sorption and reduction of Cr(VI)into Cr(II)occurred simultaneously on ***,PDA coating not only improved the reactivity of lignin but also promoted the complete reduction of Cr(VI)by *** to these results,polydopamine functionalized-lignin is a promising bio-based adsorbent for immobilization of Cr(VI)from wastewater.

关键词： Lignin Polydopamine Hexavalent chromium EXAFS Adsorption mechanism

Vacancy engineering induced reaction kinetics enhancement of cobalt metaphosphate for pH-universal hydrogen evolution

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Nano Research 2024年第5期17卷 3879-3887页

作者： Yuting chen Tian meng Zhicai Xing Yueying Yan Yang Yang Bohan yao Dewen Wang Xiurong Yang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Developing efficient pH-universal hydrogen evolution reaction(HER)catalysts is critical in the field of water electrolysis,however,which is severely hampered by the sluggish kinetics in alkaline ***,a ruthenium(Ru)incorporation induced vacancy engineering strategy is firstly proposed to precisely construct oxygen vacancy(V_(O))-riched cobalt-ruthenium metaphosphate(CRPO)for high-efficiency pH-universal *** V_(O) modifies the electronic structure,improves the superficial hydrophilic and gas spillover capacity,it also reduces the coordination number of Ru atoms and regulates the coordination *** calculations indicate that Ru tends to adsorb H_(2)O and H^(*),whereas V_(O) tends to adsorb OH^(-),which greatly promotes the H_(2)O adsorption and the dissociation of HO-H ***,CRPO-2 exhibits remarkable HER performance,the mass activity is about 18.34,21.73,and 38.07 times higher than that of Pt/C in acidic,neutral,and alkaline media,respectively,at the same time maintain excellent *** findings may pave a new avenue for the rational design of electrocatalysts toward pH-universal water electrolysis.

关键词： cobalt metaphosphate pH-universal hydrogen evolution reaction(HER) vacancy engineering low-coordination atoms oxygen vacancy