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福建地区地壳三维P波速度结构与构造含义

地震地质 2023年第4期45卷 970-986页

作者：李强吴建平中国地震局地球物理研究所北京100081 福建省地震局福州350003

福建地区经历了复杂的构造演化过程,多期构造变化所形成的巨量侵入-火山岩在该区域广泛出露。文中利用1999-2021年福建地震台网的观测报告,并融合周边省份的部分数据,挑选出了3203个地震,其中包括76423条绝对到时数据,389021条P波相对... 详细信息

福建地区经历了复杂的构造演化过程,多期构造变化所形成的巨量侵入-火山岩在该区域广泛出露。文中利用1999-2021年福建地震台网的观测报告,并融合周边省份的部分数据,挑选出了3203个地震,其中包括76423条绝对到时数据,389021条P波相对到时数据。采用双差地震层析成像方法获得了福建地区地壳三维P波速度的精细结构,横向分辨率为0.25°。除闽西北地块外,其他区域可被检测板较好恢复。研究结果表明:1)闽西南地块在15~25km深度普遍呈现相对低速特征,结合区域地质背景、前人的接收函数结果及大地电磁测深数据等分析认为,该低速特征并非由部分熔融或韧性剪切带所致,主要是由于区域地壳更富含石英成分引起的;2)闽东地块的中下地壳存在2个相对低速异常体,且与地表大地热流异常相对高值区对应;3)福安-南靖断裂带在中下地壳对该区域的地壳速度分布具有一定的控制作用,进一步证实其是区域内的一条深大断裂带。

关键词：福建地区双差层析成像速度结构福安-南靖断裂带

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基于形式化方法的因特网路由协议的一致性测试(英文)

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软件学报 2000年第4期11卷 427-434页

作者：毕军吴建平清华大学计算机科学与技术系北京100084

并发数表组合表述法 (并发 TTCN)是可以描述并发测试行为的测试表述法 .该文提出一种基于并发TTCN的分布式路由协议的测试方法 .首先讨论路由协议实体的测试结构 ,然后给出基于并发 TTCN测试系统的设计 .

关键词：一致行测试路由协议 Internet网形式化方法

Spherical Confinement Generates Entropic Force to Accelerate Polymer Chain Detachment

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Chinese Journal of Polymer Science 2024年第3期42卷 407-416,I0010页

作者： Yu-Shan Zheng jian-ping Zhou Yan Xu Kai Li Mechanical Engineering Xinjiang UniversityUrumqi 830002China

To understand the dynamic process of polymer detachment, it is necessary to determine the mean detachment time of a single breakable link, which is modeled as a spring. Normally, this time can be viewed as the escape of a Brownian particle from the potential well of the spring. However, as the free dangling length of the polymer chain increases, the conformational entropy of the chain is affected by geometric confinement. It means that the wall exerts a repulsive force on the chain, resulting in accelerated link detachment from a macroscopic perspective. In this work, we investigate the effect of entropy on the detachment rate in the case where the substrate is spherical. We demonstrate that spherical confinement accelerates chain detachment both inside and outside the sphere. An analytical expression for the mean detachment time of breakable links is given, which includes an additional pre-factor that is related to the partition function. Additionally, we analyze the expressions for entropic forces inside the sphere, outside the sphere, and on a flat wall, comparing their magnitudes to explain the difference in mean detachment time.

关键词： Polymer detachment Breakable link Entropic force Mean first passage time

Optimal Risk Sharing for Maxmin Choquet Expected Utility Model

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 430-444页

作者： De-jian TIAN Shang-ri wu School of Mathematics China University of Mining and TechnologyXuzhou 221116China

This article analyzes the Pareto optimal allocations,agreeable trades and agreeable bets under the maxmin Choquet expected utility(MCEU)*** provide several useful characterizations for Pareto optimal allocations for risk averse *** derive the formulation descriptions for non-existence agreeable trades or agreeable bets for risk neutral *** build some relationships between ex-ante stage and interim stage on agreeable trades or bets when new information arrives.

关键词： maxmin Choquet expected utility model Pareto optimal allocation agreeable trade agreeable bet

Probabilistic Neural Networks based network security management

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通讯和计算机（中英文版） 2008年第2期5卷 19-24页

作者： LIU wu wu Zhi-you DUAN Hai-xin LI Xing wu jian-ping Network Research Center of Tsinghua University Beijing 100084 China Research Center of Information Technology ＆ Intelligent Optimization Chongqing Normal University Chongqing 40004Z China

Intrusion Detection System (IDS) is one of the main tools in computer and network management, we consider intrusion detection using probabilistic neural networks. An ensemble of Probabilistic Neural Networks (PNN) is trained with Adaptive Boost to classify the detected event as normal or intrusive. We use Hamming distance kernels for PNN and find them superior to Euclidean distance kernels for this kind of detected event.

关键词：或然论人工神经网络网络安全安全技术

Recent advances in ocular lubrication

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Friction 2024年第9期12卷 1929-1954页

作者： jianhua ZHANG Yunjuan SU jian wu Hongdong WANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

The ocular lubrication,where the eyelid constantly slides on the curved corneal surface,is considered as one of primary lubrication systems in *** reliable lubrication conditions,sensitive ocular tissues remain intact from fatigue damage during spontaneous blink *** tear film,evenly filled between cornea and conjunctiva,is a biological fluid with dynamic adjustment ability,which provides superior lubrication with the friction coefficient of below ***,the lubrication failure may result in a variety of uncomfortable symptoms such as inflammatory reactions,tissue damage and neurological ***,it is essential to clarify the fundamental mechanism of ocular lubrication,which helps to alleviate and even recover from various ocular *** review firstly demonstrates that the ocular components,containing lipids and mucins,contribute to maintaining the lubrication stability of tear ***,the ocular lubrication state in various physiological environments and the physical effect on tear film dynamics are further *** typical applications,the therapeutic agents of dry eye syndrome and contact lens with superior lubrication effects are introduced and their lubrication mechanisms are ***,this review summarizes a series of the latest research inspired by ocular ***,this work will provide a valuable guidance on the theoretical research and extensive applications in the field of biological lubrication.

关键词： bio-tribology ocular lubrication tear film dry eye syndrome tear film dynamics

Single-atom sites regulation by the second-shell doping for efficient electrochemical CO_(2)reduction

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Chinese Chemical Letters 2024年第9期35卷 360-363页

作者： Qian-Qian Tang Li-Fang Feng Zhi-Peng Li Shi-Hao wu Long-Shuai Zhang Qing Sun Mei-Feng wu jian-ping Zou Key Laboratory of jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China

Nitrogen-doped carbon loaded single-atom catalysts(SACs)are promising candidates for electrocatalytic conversion of CO_(2)into high-valuable chemicals,and the modification of catalysts by heteroatom-doping strategy is an effective approach to enhance the CO_(2)reduction ***,the large difference exists in atomic radius between nitrogen atoms and the doped heteroatoms may lead to the poor stability of active *** this study,we have synthesized a Ni single atom catalyst with S doping at the secondshell on the ultrathin carbon nanosheets support(Ni-N_(4)-SC)by solid-phase *** S atom in the second-shell contributes to the higher efficiency of CO_(2)conversion at lower potentials while the Ni-N_(4)-SC can be more *** experimental results and theoretical calculations indicate that the S atom in second-shell breaks the uniform charge distribution and reduces the free energy of hydrogenation,which can increase the adsorption of CO_(2),accelerate charge transfer,and reduce the reaction energy *** work reveals the close relationship between the second-shell and the electrocatalytic activity of single atom sites,which also provides a new perspective to design efficient single atom catalysts.

关键词： Single-atom catalyst Heteroatom-doping Second shell CO_(2)electroreduction Electronic structure regulation

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分布式服务质量路由预计算算法

电子学报 2005年第12期33卷 2165-2169页

作者：崔勇吴建平清华大学计算机科学与技术系北京100084

服务质量路由作为下一代IP互联网提供服务质量(QoS)控制的一种重要方案,如何提高其可扩展性和路由性能是有待解决的难题.本文提出了基于聚类的分布式预计算算法,以具有多种QoS参数的路由表预计算为目标,引入了支持QoS参数的扩展距离向量... 详细信息

服务质量路由作为下一代IP互联网提供服务质量(QoS)控制的一种重要方案,如何提高其可扩展性和路由性能是有待解决的难题.本文提出了基于聚类的分布式预计算算法,以具有多种QoS参数的路由表预计算为目标,引入了支持QoS参数的扩展距离向量,通过网络中各个节点的分布式协同计算,大大降低了单个路由器的计算复杂度.文章分析了优势路径及其选取策略,给出了路由计算中优势路径聚集的聚类方法,实现了QoS路由表的高效聚集压缩.实验结果进一步验证了该算法具有计算量小和QoS路由性能高的优点,在QoS度量维数和网络规模方面均具有良好的可扩展性,并对域间算法研究提供了重要依据.

关键词：多约束分布式计算服务质量路由预计算

Reaction mechanism between Al_(2)O_(3)–MgO refractory materials and rare earth high-carbon heavy rail steel

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Journal of Iron and Steel Research International 2024年第5期31卷 1153-1163页

作者： Yi Wang Guang-jie Song ping Shen jian-zhong He Da-xian Zhang jian-xun Fu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringState Key Laboratory of Advanced Special SteelShanghai UniversityShanghai200444China State Key Laboratory of Baiyunebo Rare Earth Resources Research and Comprehensive Utilization Baotou014030Inner MongoliaChina Inner Mongolia Baotou Steel Union Co. Ltd.Baotou014030Inner MongoliaChina

Submerged entry nozzle(SEN)clogging is a major problem affecting the production quality of rare earth steel,and finding a suitable refractory outlet can significantly reduce production *** explore the relationship between refractory composition and interface interaction,unprotected coated Al_(2)O_(3)–MgO refractories and SiO2-coated Al_(2)O_(3)–MgO refractories were added to rare earth high-carbon heavy rail steel under laboratory conditions,and the Al_(2)O_(3)–MgO refractory was found to be more *** results show that,from the epoxy resin side to the refractory side,the contour of the refractory interface reaction layer can be divided into two main layers:an iron-rich reaction layer and an iron-poor reaction *** based on the spherical model suggest that the adhesion force is proportional to the size of the refractory particles and inclusions,and the same result applies to the surface *** the inclusions at a smaller size has a specific effect on alleviating the erosion of *** with the erosion mechanism of Al_(2)O_(3)–MgO refractories,the interface reaction mechanism between Al_(2)O_(3)–MgO refractories and molten steel was proposed,which provides ideas for solving SEN clogging.

关键词： Rare earth high-carbon heavy rail steel Al_(2)O_(3)-MgO refractory Adhesion Surface tension Interface interaction