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Facile formation of Mg-containing interphase on nanosilicon from Agar/MgCO3 precursor for lithium-ion battery anodes

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Progress in Natural Science:Materials International 2025年第01期 177-186页

作者： Ke Zhang jianhua zhou Haoran Liu Xiaoyang Wang Jie Gao Jun-Liang Chen Haiqing Qin Wenping Liu Xiaoxu Lei Lei Miao Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials School of Material Science and Engineering Guilin University of Electronic Technology Novel Battery Materials Research Center of Engineering Technology State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of Physical Science and Technology Guangxi University Guangxi Key Laboratory of Superhard Material Guangxi Technology Innovation Center for Special Mineral Material China Nonferrous Metal (Guilin) Geology and Mining Co. Ltd.

The ultra-high theoretical capacity(4200 mAh g-1) of Silicon anode materials for lithium-ion batteries while which is one of the ideal replacement materials for graphite anodes. However, the poor electrical conductivity and greatly reduces the cycle life of the battery of Silicon material, which suffers from severe volume expansion during charge/discharge cycling leading to electrode pulverization. In this work, Agar/magnesium carbonate-coated silicon nanocomposites were synthesized by utilizing the "self-solidifying" property of agar. The magnesium oxide formed by the decomposition of magnesium carbonate at high temperatures mitigates the volume expansion of nanosilicon together with the derived carbon layer. Moreover, the lithium-magnesium alloy electronconducting interface layer generated by the reaction between lithium ions and magnesium oxide, which greatly shortens the diffusion length of lithium ions and electrons inside the electrode during the charge-discharge cycle. The first discharge specific capacity was 2060.2 mAh g-1, the Coulombic efficiency as high as 86.28 %, and still possesses a reversible specific capacity of 801.5 mAh g-1after cycling 200 cycles at a high current of 500 mA g-1of Agar/magnesium@Si with optimal ratio composite. The composite material used in this work largely suppresses the volume expansion of the silicon anode and contributes to the design of low-cost and high Coulombic efficiency lithium-ion batteries.

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Digital PCR-free technologies for absolute quantitation of nucleic acids at single-molecule level

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Chinese Chemical Letters 2025年第2期36卷 118-126页

作者： Xinyi Luo Ke Wang Yingying Xue Xiaobao Cao jianhua zhou Jiasi Wang Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument School of Biomedical Engineering Shenzhen Campus of Sun Yat-sen University School of Biomedical Engineering Sun Yat-sen University Guangzhou National Laboratory Guangzhou International Bio Island

Ultrasensitive detection of nucleic acids is of great significance for precision medicine. Digital polymerase chain reaction (dPCR) is the most sensitive method but requires sophisticated and expensive instruments and a long reaction time. Digital PCR-free technologies, which mean the digital assay not relying on thermal cycling to amplify the signal for quantitative detection of nucleic acids at the singlemolecule level, include the digital isothermal amplification techniques (d IATs) and the digital clustered regularly interspaced short palindromic repeats (CRISPR) technologies. They combine the advantages of d PCR and IATs, which could be fast and simple, enabling absolute quantification of nucleic acids at a single-molecule level with minimum instrument, representing the next-generation molecular diagnostic technology. Herein, we systematically summarized the strategies and applications of various dIATs, including the digital loop-mediated isothermal amplification (dLAMP), the digital recombinase polymerase amplification (dRPA), the digital rolling circle amplification (dRCA), the digital nucleic acid sequencebased amplification (d NASBA) and the digital multiple displacement amplification (d MDA), and evaluated the pros and cons of each method. The emerging digital CRISPR technologies, including the detection mechanism of CRISPR and the various strategies for signal amplification, are also introduced comprehensively in this review. The current challenges as well as the future perspectives of the digital PCR-free technology were discussed.

关键词： Absolute quantification Digital bioassay Digital CRISPR/Cas Isothermal amplification Nucleic acid detection

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基于裂纹模板法的双层金属网格透明导电薄膜制备及性能

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物理学报 2025年第1期74卷 133-142页

作者：廖敦微周建华郑月军邵阳学院信息科学与工程学院邵阳422000 国防科技大学电子科学学院长沙410073

在裂纹模板法制备单层金属网格透明导电薄膜的基础上,为提升其电磁屏蔽性能,制备了双层金属网格透明导电薄膜.通过旋涂法和提拉法工艺分别得到双层裂纹模板后,进而制备相应的双层金属网格透明导电薄膜.首先对同样条件下采用旋涂法制备... 详细信息

在裂纹模板法制备单层金属网格透明导电薄膜的基础上,为提升其电磁屏蔽性能,制备了双层金属网格透明导电薄膜.通过旋涂法和提拉法工艺分别得到双层裂纹模板后,进而制备相应的双层金属网格透明导电薄膜.首先对同样条件下采用旋涂法制备的单层和双层金属网格透明导电薄膜样品进行性能测试和对比,可知双层结构相对于单层的透光率下降了10.9%,在Ku波段(12-18 GHz)测试的电磁屏蔽效能提升了30 dB.另外,对提拉法制备的双层金属网格样品也进行了测试,与同样条件制备的单层金属网格样品相比,双层结构在损失8.38%的透光率前提下,在Ku波段的电磁屏蔽效能提升了20 dB.测试结果表明,制备的双层金属网格透明导电薄膜在牺牲一定透光性能前提下可明显提升电磁屏蔽性能.通过对基于裂纹模板法的双层金属网格透明导电薄膜的制备和性能研究,可以充分利用裂纹模板法工艺的低成本优势制备高电磁屏蔽性能的双层金属网格透明导电薄膜.

关键词：裂纹模板法双层金属网格透明导电薄膜高电磁屏蔽性能磁控溅射

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结合多模态数据和混合模型的情绪识别

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小型微型计算机系统 2025年第1期46卷 111-118页

作者：宗静熊馨周建华张琪周雕吉瑛昆明理工大学信息工程与自动化学院昆明650500 昆明医科大学研究生院昆明650500

如何准确的识别人类情绪是一项颇具挑战性且十分有意义的任务,然而,由于情绪的复杂性,单一模态信号很难全面地描述情绪,而且基于生理信号的情绪识别准确率仍有可提升的空间.因此,本文提出了一种新颖的多模态轻量化情绪识别混合模型,名为... 详细信息

如何准确的识别人类情绪是一项颇具挑战性且十分有意义的任务,然而,由于情绪的复杂性,单一模态信号很难全面地描述情绪,而且基于生理信号的情绪识别准确率仍有可提升的空间.因此,本文提出了一种新颖的多模态轻量化情绪识别混合模型,名为FCAN-FFM-LightGBM,该模型主要由FCAN-FFM和LightGBM两部分构成,前者作为特征处理器,后者作为分类器.使用脑电信号(EEG)、眼电信号(EOG)和肌电信号(EMG)进行情绪识别.在DEAP公共数据集上进行广泛的实验验证,在四分类、唤醒维度和效价维度实验中分别取得了95.92%、97.22%和97.16%的准确率.结果表明,混合模型有助于提升情绪识别准确率且多模态的情绪识别准确率明显优于单模态.与其它方法相比,本文方法在取得较高情绪分类精度的同时降低了计算成本.

关键词：情绪识别多模态融合 EEG EMG EOG

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A resilient adjustment method to weigh pseudorange observation in precise point positioning

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Satellite Navigation 2022年第3期3卷 125-139,I0004页

作者： Qieqie Zhang Long Zhao jianhua zhou College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing211106China Digital Navigation Center School of Automation Science and Electrical EngineeringBeihang UniversityBeijing100191China Beijing Satellite Navigation Center Beijing100094China

The accurate weighting of pseudorange observations is important to improve the convergence time and positioning quality of Precise Point Positioning(PPP).Currently,the weight of a pseudorange observation is mainly determined with empirical stochastic ***,in a complex environment,due to the inability to adapt for the dynamic changes of the user environment,the empirical stochastic models usually cannot reflect the real error level of pseudorange *** address this problem,a resilient adjustment method to weigh pseudorange observations is proposed,which constructs the real-time estimation and inflation model for the variance of pseudorange multipath error and measurement noise to replace the empirical stochastic model to determine the weights of pseudorange observations.A set of static and dynamic Global Positioning System(GPS)test data are used to verify the effectiveness of the proposed *** test results indicate that the proposed real-time estimation model can provide a better representation of the pseudorange accuracy,and the positioning performance of PPP using the real-time estimation model is better than that with the empirical stochastic *** with the optimal empirical stochastic model,the positioning accuracy of PPP with the real-time estimation model is improved by at least 20%,and the convergence time is reduced by at least 50%.

关键词： Precise point positioning Stochastic model Resilient adjustment Complex environments

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Major Problems Related with Operation of Catalytic Reforming Units and Countermeasures

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China Petroleum Processing & Petrochemical Technology 2006年第2期8卷 1-13页

作者： zhou jianhua Petroleum Refining Division Sinopec Corp. Beijing 100029

Currently the catalytic reforming units are playing an increasingly important role for gasoline quality upgrading, increased production of high add-value aromatic compounds and supply of cheap hydrogen resources. The high proportion of FCC gasoline in China＇s automotive gasoline pool has led to a quite significant gap in gasoline quality as compared to the demand of World Fuel Charter and even to the new Chinese standards for unleaded automotive gasoline. According to the statistical data, the ratio of FCC naphtha in the gasoline pool is 35% in the US and 27% in EU, whereas that number is 75% in China＇s gasoline pool. The share of reformate and other high-quality gasoline components in the gasoline pool is 65% in the US and 73% in EU, whereas that number is merely 14% in China＇s gasoline pool along with a definite share of low-octane （straight-run） gasoline.

关键词：催化重整汽油产品质量流化床催化裂化辛烷值石脑油

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学术还是功利：教育博士生学习动机如何影响学业成就

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中国高教研究 2025年第2期 68-74+108页

作者：覃红霞李俊晓张斌张衷平周建华厦门大学高等教育发展研究中心厦门大学教育研究院山西应用科技学院三创学院深圳职业技术大学质量保障中心宁波大学教师教育学院

基于全国教育博士培养单位调查数据，分析教育博士生不同学习动机对学业成就的影响机制，发现不同学习动机对学业成就的影响机制存在差异，学术志趣动机有助于能力提升与学习满意度，功利取向动机则有助于促进学位完成，学习投入在其中... 详细信息

基于全国教育博士培养单位调查数据，分析教育博士生不同学习动机对学业成就的影响机制，发现不同学习动机对学业成就的影响机制存在差异，学术志趣动机有助于能力提升与学习满意度，功利取向动机则有助于促进学位完成，学习投入在其中发挥重要作用。影响两种动机的因素也存在显著差异，学术志趣动机更多受学术氛围、导师指导与课程教学等内在因素影响，功利取向动机则更多受同伴互助与学业管理等外在因素影响。教育博士生学习动机具有明确的实践导向，并非单纯的知识积累和论文发表，契合学位设立初衷。因此，培养高校应优化制度安排，明确教育博士专业定位与培养目标，突出其应用性、实践性与创新性，营造良好环境，调整优化学习动机，激发学习投入。

关键词：教育博士生学习动机学业成就学习投入

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Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox

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Science China(Physics,Mechanics & Astronomy) 2015年第8期58卷 86-94页

作者： LI XiaoJie zhou jianhua HU XiaoGong LIU Li GUO Rui zhou ShanShi Beijing Satellite Navigation Center Shanghai Key Laboratory of Space Navigation and Position Techniques Shanghai Astronomical Observatory Chinese Academy of Sciences

Geostationary(GEO) satellites form an indispensable component of the constellation of Beidou navigation system(BDS). The ephemerides, or predicted orbits of these GEO satellites(GEOs), are broadcast to positioning, navigation, and timing users. User equivalent ranging error(UERE) based on broadcast message is better than 1.5 m(root formal errors: RMS) for GEO satellites. However, monitoring of UERE indicates that the orbital prediction precision is significantly degraded when the Sun is close to the Earth's equatorial plane(or near spring or autumn Equinox). Error source analysis shows that the complicated solar radiation pressure on satellite buses and the simple box-wing model maybe the major contributor to the deterioration of orbital precision. With the aid of BDS' two-way frequency and time transfer between the GEOs and Beidou time(BDT, that is maintained at the master control station), we propose a new orbit determination strategy, namely three-step approach of the multi-satellite precise orbit determination(MPOD). Pseudo-range(carrier phase) data are transformed to geometric range(biased geometric range) data without clock offsets; and reasonable empirical acceleration parameters are estimated along with orbital elements to account for the error in solar radiation pressure modeling. Experiments with Beidou data show that using the proposed approach, the GEOs' UERE when near the autumn Equinox of 2012 can be improved to 1.3 m from 2.5 m(RMS), and the probability of user equivalent range error(UERE)<2.0 m can be improved from 50% to above 85%.

关键词： Beidou system (BDS) Beidou time (BDT) geostationary (GEO) satellite spring equinox/autumn equinox solar radia-tion pressure time synchronization user equivalent ranging error

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Quantum coherent control of ultrashort laser pulses

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Chinese Science Bulletin 2008年第5期53卷 652-658页

作者： zhou JianYing ZENG jianhua LI dunTao State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University Guangzhou 510275 China

The effective photonic control is one of the key issues in photo-physics. Significant advancement in photonic crystals, quantum optics, ultrafast optics as well as micro-nano-optics gives rise to new op-portunities to manipulate the emission and propagation in optical fields, leading to a number of new and interesting discoveries, e.g., ultrashort light pulse storage and efficient energy conversion. This paper reviews the latest research progress in storage, release and energy conversion for ultrashort laser pulses in periodical arrays of absorbing medium. Techniques to fabricate such devices are also presented.

关键词：超短激光脉冲光学晶体孤波半导体量子阱全息印刷术量子相干控制

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Plasmonic biosensing based on non-noble-metal materials

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Chinese Chemical Letters 2018年第1期29卷 54-60页

作者： jianhua zhou Yangyang Wang Li Zhang Xuemeng Li Key Laboratory of Sensing Technology and Biomedical Instruments of Guangdong Province Department of Biomedical Engineering School of Engineering Sun Yat-sen University

Plasmonic nanostructures can confine light through localized surface plasmon resonance （LSPR）, thereby enabling highly sensitive, label-free, and real-time physical and chemical sensing. Nowadays, the LSPR biosensing based on noble metal is still restricted in research laboratories, due to the limitations of their intrinsic properties, high prime price, and high process cost. Researchers thereby have paid attention to the non-noble metals and semiconductor materials in recent years. This review focuses on the research progress of non-noble-metal materials with nanostructures for plasmonic biosensing. Firstly, the physical and sensing principles of LSPR sensors are briefly introduced. Then, non-noble-metal materials, such as copper, aluminum, semiconductor, graphene and other materials, for plasmonic sensing are categorized and presented. Finally, a rational discussion about the future prospective of novel materials for plasmonic sensing is given.

关键词： Plasmonic biosensingLocalized surface plasmon resonanceNon-noble-metal nanomaterialCopperAluminumSemiconductorGraphene

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