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Location privacy protection of maritime mobile terminals

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Digital Communications and Networks 2022年第6期8卷 932-941页

作者： Xin su su Jiang Dongmin Choi College of IOT Engineering Hohai UniversityChangzhou213022China Division of Undeclared Majors Chosun UniversityRepublic of Korea

Mobile Edge Computing(MEC)can support various high-reliability and low-delay applications in Maritime Networks(MNs).However,security risks in computing task offloading *** this study,the location privacy leakage risk of Maritime Mobile Terminals(MMTs)is quantified during task offloading and relevant Location Privacy Protection(LPP)schemes of MMT are considered under two kinds of task offloading *** single-MMT and single-time offloading scenario,a dynamic cache and spatial cloaking-based LPP(DS-CLP)algorithm is proposed;and under the multi-MMTs and multi-time offloading scenario,a pseudonym and alterable silent period-based LPP(PA-SLP)strategy is *** results show that the DS-CLP can save the response time and communication cost compared with traditional algorithms while protecting the MMT location ***,extending the alterable silent period,increasing the number of MMTs in the maritime area or improving the pseudonym update probability can enhance the LPP effect of MMTs in ***,the study results can be effectively applied to MNs with poor communication environments and relatively insufficient computing resources.

关键词： Location privacy protection Maritime network Mobile edge computing Task floading

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民办高校应用型绿色建筑技能人才培养研究

山西建筑 2025年第1期51卷 192-194,198页

作者：苏瑾瑾广州华商职业学院广东广州511300

当前国家政策统筹调整产业结构,随着协同推进生态减污、生态保护的美丽中国建设中,伴随建筑产业绿色化、智能化、工业化的发展趋势,中国建造的转型升级需要培养大量新型建筑专业人才。民办高校作为行业人才需求的蓄水池,应以行业变化趋... 详细信息

当前国家政策统筹调整产业结构,随着协同推进生态减污、生态保护的美丽中国建设中,伴随建筑产业绿色化、智能化、工业化的发展趋势,中国建造的转型升级需要培养大量新型建筑专业人才。民办高校作为行业人才需求的蓄水池,应以行业变化趋势为依据,以企业人才新需求为基点,重构人才培养体系,一方面要强化新知识、打牢新基础;另一方面建立强化实践育人的人才培养机制。

关键词：民办高校绿色建筑技能人才培养研究

Perfect Adaptation of General Nonlinear Systems

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Journal of Systems Science & Complexity 2016年第1期29卷 61-73页

作者： su Wei The Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences

Perfect adaptation describes the ability of a biological system to restore its biological function precisely to the pre-perturbation level after being affected by the environmental ***,a biological system with perfect adaptation can be modelled as an input-output nonlinear system whose output,usually determining the biological function,is asymptotically stable under all input disturbances *** this paper,a quite general input-output mathematical model is employed and the 'functional' of biological function(FBF)- output Lyapunov function- is explored to investigate its perfect adaptation *** condition is established for the systems with FBF to achieve perfect *** a sufficient and necessary condition is obtained for the linear systems to possess an output Lyapunov ***,it is shown that the 'functional'of receptors activity exists in the perfect adaptation model of *** *** with the existing mathematical surveys on perfect adaptation,most of which are based on the standpoint of control theory,we first investigate this problem using ways of nonlinear systems analysis.

关键词： Output Lyapunov function perfect adaptation perturbed nonlinear systems

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论校本教研功能的三重属性

北京教育学院学报 2025年第1期39卷 47-53页

作者：苏君阳北京师范大学教育学部北京100875

校本教研是以校为本的一种特殊的教学研究活动。校本教研功能具有认识论、方法论与实践论三重属性:认识论属性功能是提升教师教学观念认识水平,方法论属性功能是提升教师研究意识与科研素养水平,实践论属性功能是提升教师课堂教学创新... 详细信息

校本教研是以校为本的一种特殊的教学研究活动。校本教研功能具有认识论、方法论与实践论三重属性:认识论属性功能是提升教师教学观念认识水平,方法论属性功能是提升教师研究意识与科研素养水平,实践论属性功能是提升教师课堂教学创新与改进能力。认识论属性功能是校本教研作用发挥的重要前提,方法论属性功能是校本教研作用得以更好发挥的可靠保障,实践论属性功能是校本教研作用发挥的根本指向与最终目的。

关键词：校本教研认识论方法论实践论

Leaf C:N:P stoichiometric homeostasis of a Robinia pseudoacacia plantation on the Loess Plateau

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Journal of Forestry Research 2023年第4期34卷 929-937页

作者： Zhuoxia su Bingqian su Shenglin Mao Zhouping Shangguan State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100ShaanxiPeople’s Republic of China

Homeostasis is the adaptability of a species to a changing ***,the ecological stoichiometric homeostasis of Robinia pseudoacacia *** diff erent climatic regions is poorly understood but could provide insights into its adaptability in the loess hilly *** study sampled 20 year-old *** plantations at 10 sites along a north–south transect on the Loess *** in the ecological stoichiometric characteristics of leaf and soil carbon,nitrogen,and phosphorus were analysed and homeostatic characteristics of leaf ecological stoichiometric parameters in diff erent climates were identifi *** aff ecting leaf stoichiometry were *** results show that *** leaves were rich in nitrogen and defi cient in phosphorous during tree growth and *** and phosphorous levels in the soils of the loess region were lower than the average in soils in the rest of *** ecological stoichiometric parameters of *** leaves in two diff erent climates were considered“strictly homeostasis”.Precipitation,available phosphorus,and soil C:P were the main factors aff ecting the variation of C:N:P stoichiometry of *** *** in the loess hilly region has strong ecologically homeostatic characteristics and suggests that it is well-adapted to the area.

关键词： Loess Plateau Robinia pseudoacacia Ecological stoichiometry Homeostasis

Experimental investigation of the thermal insulation performance of Ce/Si/Ti oxide heat-reflective coating

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第10期24卷 912-924页

作者： Rui su Yue LV Qian su Yanfei PEI School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

To solve the problem of deformation and cracking of ballastless track slab under temperature load,a composite oxide and a series of heat-reflective coating samples were *** the microscopic level,the elemental composition and optical properties of the materials prepared were analyzed by Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy,and the feasibility of Ce/Si/Ti oxide as functional fillers for heat-reflective coatings of track slabs was *** the macro level,by designing and assembling an indoor sunlight simulation test device,the surface and internal temperatures of the coated and uncoated concrete specimens were analyzed and studied,and the macroscopic cooling effect of the coatings was ***,to study the engineering application effect of the track slab thermal insulation reflective coating,COMSOL was used to build a 3D calculation model of the heat transfer deformation of the ballastless track slab *** research results showed that:Ce/Si/Ti oxide has strong reflectivity and can reflect 95%of infrared light;it has good ultraviolet(UV)shielding ability and can absorb more than 65%of the UV *** TiO2 coating can reduce the temperature of the concrete surface by 6–11℃and that of the inside of the concrete by 10–14℃;the cooling effect decreases evenly with the increase of air *** Ce/Si/Ti oxide coating can reduce the surface temperature of the concrete by 16℃and that of the inside of the concrete by 15℃.In addition,the cooling effect is basically not affected by the air temperature,and it changes non-linearly with the increase of the Ce/Si/Ti oxide *** calculation shows that the heat reflective coating can reduce the surface temperature and internal temperature difference of the track slab by 11.54–21.31℃,and the vertical displacement of the track slab can be reduced by about 35%–70%.Considering the cooling effect,the adhesion strength,and the engineering application effe

关键词： Track slab Solar radiation Thermochromic coating Cooling performance

Shock Formation for 2D Isentropic Euler Equations with Self-similar Variables

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Chinese Annals of Mathematics,Series B 2024年第3期45卷 349-412页

作者： Wenze su School of Mathematical Sciences Fudan UniversityShanghai 200433China

The author studies the 2D isentropic Euler equations with the ideal gas *** exhibits a set of smooth initial data that give rise to shock formation at a single point near the planar *** solutions to the 2D isentropic Euler equations are associated with non-zero vorticity at the shock and have uniform-in-time-1/3-Holder ***,these point shocks are of self-similar type and share the same profile,which is a solution to the 2D self-similar Burgers *** proof of the solutions,following the 3D construction of Buckmaster,Shkoller and Vicol(in 2023),is based on the stable 2D self-similar Burgers profile and the modulation method.

关键词： 2D isentropic Euler equations Shock formation Self-similar solution

Cretaceous Meteorite Impact-Induced Initial subduction:Records of highly Siderophile Element Abundances and Re-Os Isotopes in Ophiolites

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Journal of Earth Science 2022年第6期33卷 1526-1534页

作者： Benxun su Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China

Compiled global ophiolite data reveal that Cretaceous ophiolites exhibit broaden variations in 187Re/188Os and ^(187)Os/^(188)Os values,increases in Re concentrations and thus Re/Os ratios in all peridotites and chromitites,and additional increased PPGE/IPGE(Pd-subgroup platinum-group element(PGE)/Ir-subgroup PGE)ratios in chromitites and dunites relative to pre-Cretaceous *** compositional changes in Cretaceous ophiolites,which mostly formed in subduction initiation settings,cannot be attributed solely to involvement of subducting or previously subducted crustal ***,the author proposes a Cretaceous meteorite impact model that led to impact-induced disruption of oceanic lithosphere,asthenosphere upwelling,subduction initiation at edges of laterally spreading ***-pressure and high-temperature conditions during the impacts caused melting of the meteorites and the ambient crustal and mantle rocks,producing hybrid melts containing partially un-melted *** materials contributed to the elevated ^(187)Os/^(188)Os values,Re and Re/Os ratios,whereas the undifferentiated meteorite accounted for the increases in the PPGE/IPGE and decreased ^(187)Os/^(188)Os *** pressure and super-reduced phases were likely generated by this process and were subsequently transported into the newly formed mantle peridotites and chromitites of future *** remaining meteoritic and lithospheric fragments most likely sank deeper and were distributed widely in the convecting mantle to produce the observed global compositional heterogeneities.

关键词： Re-Os isotopes ophiolites PGE meteorites subduction initiation oceanic lithosphere

多力场耦合条件下T型圆管通道内流体热混合机理研究

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西安交通大学学报 2025年第1期59卷 78-92页

作者：李桉琦苏博林梅王秋旺西安交通大学能源与动力工程学院西安710049

针对海洋动力平台和船舶动力装置中T型圆管通道内冷热流体间的热混合机理尚不清楚的问题,利用大涡模拟方法,对不同支管布置方式高温高压工况下(运行压力为10 MPa,进口流体温差为275 K,摇摆雷诺数为41 500)的多力场耦合T型圆管通道内流... 详细信息

针对海洋动力平台和船舶动力装置中T型圆管通道内冷热流体间的热混合机理尚不清楚的问题,利用大涡模拟方法,对不同支管布置方式高温高压工况下(运行压力为10 MPa,进口流体温差为275 K,摇摆雷诺数为41 500)的多力场耦合T型圆管通道内流体热混合机理进行数值研究。利用提出的混合系数定量评价了不同布置方式下T型圆管通道内流体混合效果,利用均方根温度定量评价了不同布置方式下T型圆管通道管壁处温度脉动情况。结果表明:剪切层和尾迹区内涡结构与温度场存在时间和空间上的协同机制,且涡脱落频率和温度脉动频率基本相同,脱落频率为19.3 Hz;附加惯性力引起T型圆管通道内涡结构和温度场在时间和空间上周期性变化,加速了流体混合过程,削弱了浮升力和重力引起的热分层现象,同时增大了流体域内温度波动,长度约为10.2 D(D为主管内径);与对应的静止工况相比,支管竖直向上、水平和竖直向下布置时,摇摆条件下混合系数分别增大了10.8%、18.3%和27.8%;摇摆条件竖直向下布置时,管壁处温度均方根峰值最大为0.16,约为静止工况的2倍。因此,支管竖直向上布置时,热混合效果最好,热分层现象最弱,在实际应用中应被优先考虑。

关键词： T型圆管通道浮升力摇摆条件热混合机理大涡模拟

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