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Ultralight and superelastic MXene/reduced graphene oxide aerogels for electromagnetic interference shielding

Nano Research 2025年第1期18卷 1-9页

作者： Xinfeng Zhou yang dai Guoyao Yue Yiman Zhang Lulu Li Zhong-Zhen Yu Peng Min Hao-Bin Zhang State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Present address:BOE Technology Innovation Center BOE Technology Group Co.Ltd.Beijing 100176China Xi’an Modern Chemistry Research Institute Xi’an 710065China

Lightweight aerogels feature multifunctionality and a high porosity,yet accompanied with poor structure recovery under large strain *** this work,we develop an air bubble-ice crystal dual template and annealing strategy to integrate low density and high resilience for the conductive transition metal carbides/nitrides(MXene)composite *** air bubbles and ice crystals synergistically exclude the nanosheets to the gas-liquid interfaces,thereby constructing unique Y-shaped junctions and robust *** annealing process greatly enhances the interlayer *** external load,the Yshaped structures prevent the stress concentration at the junctions by transferring the forces to the skeleton for maintaining structural *** addition,the wrinkled and thick cell walls,together with the enhanced interlayer interactions,endow the aerogel with exceptional structural stability and *** a result,the MXene/reduced graphene oxide(RGO)composite aerogels exhibit superelasticity with reversible compressive strains of up to 95%.In addition,the electron bridging effect of the RGO sheets affords the aerogel to deliver excellent electromagnetic interference shielding performance,as high as 46.3 dB at 2.5 ***,the remarkable reshapeability of the aerogels allows for precise regulation of structure and performance(33.5-75.1 dB)by a simple wetting compression *** summary,this work offers helpful inspirations for developing lightweight and superelasticity aerogels for extensive applications.

关键词： lightweight superelasticity MXene aerogel electromagnetic interference shielding reshapeability

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Heavy Traffic Limit Theorems for a Queue with Poisson ON/OFF Long-range Dependent Sources and General Service Time Distribution

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 807-822页

作者： Wan-yang dai Department of Mathematics and State Key Laboratory of Novel Software TechnologyNanjing University

In Internet environment, traffic flow to a link is typically modeled by superposition of ON/OFF based sources. During each ON-period for a particular source, packets arrive according to a Poisson process and packet sizes （hence service times） can be generally distributed. In this paper, we establish heavy traffic limit theorems to provide suitable approximations for the system under first-in first-out （FIFO） and work-conserving service discipline, which state that, when the lengths of both ON- and OFF-periods are lightly tailed, the sequences of the scaled queue length and workload processes converge weakly to short-range dependent reflecting Gaussian processes, and when the lengths of ON- and/or OFF-periods are heavily tailed with infinite variance, the sequences converge weakly to either reflecting fractional Brownian motions （FBMs） or certain type of long- range dependent reflecting Gaussian processes depending on the choice of scaling as the number of superposed sources tends to infinity. Moreover, the sequences exhibit a state space collapse-like property when the number of sources is large enough, which is a kind of extension of the well-known Little＇s law for M/M/1 queueing system. Theory to justify the approximations is based on appropriate heavy traffic conditions which essentially mean that the service rate closely approaches the arrival rate when the number of input sources tends to infinity.

关键词： reflecting fractional Brownian motion reflecting Gaussian process long-range dependence queueing process weak convergence

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基于关键事件的包公故事非物质文化遗产信息资源聚合研究——以《狸猫换太子》为例

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档案与建设 2025年第1期 69-75页

作者：戴旸邹凤云安徽大学管理学院安徽合肥230601

包公故事是我国国家级民间文学类非物质文化遗产,其内涵在长期的历史活态流变中发生了多次变革,这期间产生、积累了大量丰富而多样的信息资源。以流程性、可视化的表达方式,对包公故事的内涵及其非物质文化遗产特质进行演绎有着重要的... 详细信息

包公故事是我国国家级民间文学类非物质文化遗产,其内涵在长期的历史活态流变中发生了多次变革,这期间产生、积累了大量丰富而多样的信息资源。以流程性、可视化的表达方式,对包公故事的内涵及其非物质文化遗产特质进行演绎有着重要的意义和价值。文章以关键事件为切入点,提取包公故事流变过程中的系列关键事件和相伴而生的信息资源,理论分析关键事件技术应用于包公故事非物质文化遗产信息资源聚合的适切性,并以包公故事中的著名公案故事《狸猫换太子》为例进行例证展演,为非物质文化遗产信息资源组织管理提供参考路径。

关键词：包公故事非物质文化遗产关键事件信息资源组织可视化

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An Adaptive Regulation Problem and Its Application

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International Journal of Automation and computing 2017年第2期14卷 221-228页

作者： Yuan Jiang Ji-yang dai Key Laboratory of Image Processing and Pattern Recognition Nanchang Hangkong University Nanchang 330063 China School of Information Engineering Nanchang Hangkong University Nanchang 330063 China

This paper studies an adaptive regulation problem for the modified FitzHugh-Nagumo neuron model under external electrical stimulation. We first present the solution of the global robust output regulation problem for output feedback system with an uncertain exosystem which models the external electrical stimulation with unknown frequency and amplitude. Then, we show that the robust control problem for the modified FitzHugh-Nagumo neuron model can be formulated as the global robust output regulation problem and the solvability conditions for the output regulation problem for the modified FitzHugh-Nagumo neuron model are all satisfied. Then, we apply the obtained output regulation result to constructing an output feedback control law for the modified FitzHugh-Nagumo neuron model to achieve global stability of the closed-loop system in the presence of uncertain parameters and external stimulus. An example is given to show that the proposed algorithm can completely reject the external electrical stimulation.

关键词： Control theory Lyapunov methods internal model principle modified FitzHugh-Nagumo model.

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基于YOLO与GOTURN跟踪的目标入侵检测方法

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计算机技术与发展 2025年第1期35卷 215-220页

作者：任帅窦恩泽代阳国能铁路装备有限责任公司内蒙古包头014000 西安工程大学机电工程学院陕西西安710600

针对检修车间面临的危害设备和人员安全的入侵行为,传统的视频监控方法不仅耗费大量人力资源,而且效率低下。为解决这一问题,结合目标检测与目标跟踪任务,该文提出了一种基于YOLO与GOTURN的检修车间入侵检测方法。首先由PTZ球机采集视频... 详细信息

针对检修车间面临的危害设备和人员安全的入侵行为,传统的视频监控方法不仅耗费大量人力资源,而且效率低下。为解决这一问题,结合目标检测与目标跟踪任务,该文提出了一种基于YOLO与GOTURN的检修车间入侵检测方法。首先由PTZ球机采集视频,再经过YOLO目标检测和GOTURN目标跟踪,得到人员边界框坐标并通过检测点的相对位置分析得出是否存在入侵行为。实验数据表明,基于YOLO和GOTURN的检修车间入侵检测方法相对于其他方法具有较高的准确率,在实际的检修车间入侵检测系统中设定IoU阈值为0.5时,人员跟踪准确率达到90%以上,检测精度达到了93.84%,并且能够有效判断入侵行为。

关键词：智能视频监控安全监测目标检测 GOTURN 区域入侵检测

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Fiber Optic Hydrogen Sensors： a Review

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Photonic Sensors 2014年第4期4卷 300-324页

作者： Minghong yang Jixiang dai National Engineering Laboratory for Optical Fiber Sensing Technologies Wuhan University of Technology Wuhan430070 China

Hydrogen is one of the next generation energies in the future, which shows promising applications in aerospace and chemical industries. Hydrogen leakage monitoring is very dangerous and important because of its low ignition energy, high combustion efficiency, and smallest molecule. This paper reviews the state-of-art development of the fiber optic hydrogen sensing technology. The main developing trends of fiber optic hydrogen sensors are based on two kinds of hydrogen sensitive materials, i.e. palladium-alloy thin films and Pt-doped WO3 coatings. In this review work, the advantages and disadvantages of these two kinds of sensing technologies will be evaluated.

关键词： Optical fiber sensors hydrogen sensing thin films coatings

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股骨粗隆间骨折患者术后预后不良的临床风险及改良型POSSUM对患者预后的评估效能分析

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临床和实验医学杂志 2025年第2期24卷 176-180页

作者：杜娟陈静代阳吴烨重庆市九龙坡区中医院骨伤科重庆400080

目的分析股骨粗隆间骨折患者术后预后不良的临床风险及改良型生理学和手术侵袭度评分(POSSUM)对患者预后的评估效能。方法回顾性纳入2022年2月至2023年2月在重庆市九龙坡区中医院接受治疗的股骨粗隆间骨折患者120例为研究对象。对患者进... 详细信息

目的分析股骨粗隆间骨折患者术后预后不良的临床风险及改良型生理学和手术侵袭度评分(POSSUM)对患者预后的评估效能。方法回顾性纳入2022年2月至2023年2月在重庆市九龙坡区中医院接受治疗的股骨粗隆间骨折患者120例为研究对象。对患者进行1年随访,根据患者的预后情况进行分组:将26例发生并发症的患者及8例死亡患者纳入预后不良组(n=34),其他86例未发生并发症及死亡情况的患者纳入预后良好组(n=86)。对两组临床资料进行分析,包括患者的年龄、性别、体重指数、骨折原因、贫血、手术时机、麻醉方式、术前美国麻醉医师协会(ASA)分级>Ⅱ级占比、骨折分型Ⅲ~Ⅳ型占比、心电图异常占比,采用单因素及多因素Logistic回归分析探究影响患者预后的相关因素。并采用改良型POSSUM评估患者预后情况,将各项临床指标及改良型POSSUM纳入逻辑回归分析中,构建预测模型,并采用受试者操作特征(ROC)曲线验证此模型对患者预后情况的预测价值。结果预后良好组和预后不良组患者在年龄、性别、体重指数、骨折原因、贫血、手术时机、麻醉方式等方面比较,差异均无统计学意义(P>0.05);预后不良组患者术前ASA分级>Ⅱ级占比、骨折分型Ⅲ~Ⅳ型占比、心电图异常占比分别为70.59%、73.53%、67.65%,均高于预后良好组(40.70%、41.86%、47.67%),差异均有统计学意义(P0.05)。多因素Logistic回归分析可知术前ASA分级>Ⅱ级、骨折分型(Ⅲ、Ⅳ型)、改良型POSSUM升高均为患者预后不良的危险因素,据此建立相关预测模型,此模型预测患者预后的曲线下面积值为0.878,95%CI:0.814~0.943,敏感度为0.794,特异度为0.860,此时最佳截断值为28.165。结论改良型POSSUM在评估股骨粗隆间骨折患者术后预后情况中具有较高的效能,且术前ASA分级、骨折分型(Ⅲ、Ⅳ型)、改良型POSSUM对患者的预后存在显著影响,据此建立的预测模型对患者的预后预测价值较高。

关键词：股骨骨折预后临床风险改良型POSSUM评分系统

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Researching and implementation of reconfigurable Hash chip based on FPGA

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Journal of Systems Engineering and Electronics 2007年第1期18卷 183-187页

作者： yang Xiaohui dai Zibin Liu Yuanfeng Wang Ting Inst. of Electronic Technology the E L. A. Information Engineering Univ Zhengzhou 450004 ER. China

The reconfigurable cryptographic chip is an integrated circuit that is designed by means of the method of reconfigurable architecture, and is used for encryption and decryption. Many different cipher algorithms can be flexibly implemented with the aid of a reconfigurable cryptographic chip and can be used in many fields. This article takes an example for the SHA-1/224/256 algorithms, and then designs a reconfigurable cryptographic chip based on the thought and method of the reconfigurable architecture. Finally, this paper gives the implementation result based on the FPGA of the family of Stratix II of Altera Corporation, and presents a good research trend for resolving the storage in hardware implementation using FPGAs.

关键词： Reconfigurable cryptographic chip FPGA

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Strain engineering of ion migration in LiCoO_(2)

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Frontiers of physics 2022年第1期17卷 169-176页

作者： Jia-Jing Li yang dai Jin-Cheng Zheng Department of Physics and Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesXiamen UniversityXiamen361005China Department of Chemical Engineering School of Environmental and Chemical Engineeringand Institute for Sustainable EnergyShanghai UniversityShangda Road 99Shanghai200444China Department of Physics Xiamen University Malaysia439000SepangSelangorMalaysia Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Xiamen UniversityXiamen361005China

Strain engineering is a powerful approach for tuning various properties of functional materials. The influences of lattice strain on the Li-ion migration energy barrier of lithium-ions in layered LiCoO_(2) have been systemically studied using lattice dynamics simulations, analytical function and neural network method. We have identified two Li-ion migration paths, oxygen dumbbell hop (ODH), and tetrahedral site hop (TSH) with different concentrations of local defects. We found that Li-ion migration energy barriers increased with the increase of pressure for both ODH and TSH cases, while decreased significantly with applied tensile uniaxial c-axis strain for ODH and TSH cases or compressive in-plane strain for TSH case. Our work provides the complete strain-map for enhancing the diffusivity of Li-ion in LiCoO_(2), and therefore, indicates a new way to achieve better rate performance through strain engineering.

关键词： LiCoO_(2) strain engineering migration energy barrier lithium-ion battery

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Antigen Processing by Autoreactive B Cells Promotes Determinant Spreading

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Cellular & Molecular Immunology 2005年第3期2卷 169-175页

作者： yang D. dai George Carayanniotis Eli Sercarz Division of Immune Regulation Torrey Pines Institute for MolecularStudies San Diego California USA Faculty of Medicine Memorial University of Newfoundland St. John＇sNewfoundland Canada

Acute primary immune responses tend to focus on few immunodominant determinants using a very limited number of T cell clones for expansion, whereas chronic inflammatory responses generally recruit a large number of different T cell clones to attack a broader range of determinants of the invading pathogens or the inflamed tissues. In T cell-mediated organ-specific autoimmune disease, a transition from the acute to the chronic phase contributes to pathogenesis, and the broadening process is called determinant spreading. The cellular components catalyzing the spreading reaction are not identified. It has been suggested that autoreactive B cells may play a central role in diversifying autoreactive T cell responses, possibly through affecting antigen processing and presentation. The clonal identity and diversity of the B cells and antibodies seem critical in regulating T cell activity and subsequent tissue damage or repair. Here, we use two autoimmune animal models, experimental autoimmune thyroiditis （EAT） and type 1 diabetes （T1D）, to discuss how autoreactive B cells or antibodies alter the processing and presentation of autoantigens to regulate specific T cell response. Cellular ＆ Molecular Immunology. 2005;2（3）：169-175.

关键词： antigen processing B cell epitope spreading autoimmunity experimental autoimmune thyroiditis type 1 diabetes

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