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淮南深地地磁总场连续观测与时变特征

地球物理学报 2024年第2期67卷 820-828页

作者：郭良辉王博宋晓林王赟金承奕姚硕史钰峰陆内火山与地震教育部重点实验室(中国地质大学北京)北京100083 中国地质大学(北京)地球物理与信息技术学院北京100083 地质过程与矿产资源国家重点实验室(中国地质大学) 北京100083 山东航天电子技术研究所山东烟台264000

深地实验室具有电磁干扰小的"超净"地磁观测优势,已成为地磁观测的新平台和研究热点.为了评估淮南深地实验室地磁环境、认识地磁总场时变特征及地下与地面耦合性,我们于2022年在地下巷道(-848 m)和地表(+22 m)同步实施了地磁总场长期连... 详细信息

深地实验室具有电磁干扰小的"超净"地磁观测优势,已成为地磁观测的新平台和研究热点.为了评估淮南深地实验室地磁环境、认识地磁总场时变特征及地下与地面耦合性,我们于2022年在地下巷道(-848 m)和地表(+22 m)同步实施了地磁总场长期连续观测,对观测数据进行了功率谱、小波谱、地磁总场变化特征的分析及与附近的蒙城地磁台比对.研究结果表明:(1)地下无(或弱)磁干扰点位的地磁环境较优越,与蒙城地磁台相媲美,适用于地磁场变化的高精度、长期连续观测;(2)地下地磁观测可有效过滤地表上由工业与人类活动等的电磁干扰,其记录的地磁总场变化与蒙城地磁台具有较好的耦合性;(3)地下磁测可清晰记录地磁总场的平静变化、不同周期磁暴、地磁脉冲等丰富的时变信息,可为地球系统科学研究提供地磁学依据.

关键词：深地实验室地磁总场时间变化观测地磁环境

基于协同过滤算法的英语视听资源个性化推荐技术

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保定学院学报 2024年第5期37卷 112-116页

作者：李琼宋小林宣城职业技术学院安徽宣城242000 集宁师范学院内蒙古乌兰察布012000

对英语视听资源进行深度语义分析,提取资源关键特征;分析英语视听资源用户的学习偏好特征,将其与视听资源语义特征匹配;利用卷积神经网络深度融合学习偏好,构建英语视听资源个性化推荐模型;引入免疫进化算法优化协同过滤算法,求解推荐模... 详细信息

对英语视听资源进行深度语义分析,提取资源关键特征;分析英语视听资源用户的学习偏好特征,将其与视听资源语义特征匹配;利用卷积神经网络深度融合学习偏好,构建英语视听资源个性化推荐模型;引入免疫进化算法优化协同过滤算法,求解推荐模型,实现英语视听资源个性化推荐.测试结果表明该方法的推荐命中率和推荐准确率均在90%以上,召回率始终稳定在87.11%以上,具有较好的个性化推荐效果.

关键词：协同过滤算法英语视听资源个性化推荐资源关键特征

Prediction of high-speed train induced ground vibration based on train-track-ground system model

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 545-554页

作者： Zhai Wanming He Zhenxing song xiaolin Train and Track Research Institute Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China

The development of analysis on train-induced ground vibration is briefly summarized. A train-track- ground integrated dynamic model is introduced in the paper to predict the ground vibration induced by high-speed trains. Representative dynamic responses of the train-track-ground system predicted by the model are presented. Some major results measured from two field tests on the ground vibration induced by two high-speed trains are reported. Numerical prediction with the proposed train-track-ground model is validated by the high-speed train running experiments. Research results show that the wheel/rail dynamic interaction caused by track irregularities has a significant influence on the ground acceleration and little influence on the ground displacement. The main frequencies of the ground vibration induced by high-speed trains are usually below 80 Hz. Compared with the ballasted track, the ballastless track structure can produce much larger train-induced ground vibration at frequencies above 40 Hz. The vertical ground vibration is much larger than the lateral and longitudinal components.

关键词： high-speed railway ground vibration dynamic model simulation field experiment

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井下巷道喷浆过程产尘的运移及分布特性

煤炭科技 2024年第3期45卷 19-24,30页

作者：宋小林李世航中国矿业大学江苏徐州221116

煤矿井下全气动喷浆技术的喷射过程涉及浆体基料、喷雾作用与周围空气等,是典型的气、液、固三相流。基于CFD-DPM方法,采用欧拉双流体模型模拟气相和水相,采用拉格朗日模型追踪喷浆过程产生的粉尘,研究了多种工况喷雾作用下粉尘的扩散过... 详细信息

煤矿井下全气动喷浆技术的喷射过程涉及浆体基料、喷雾作用与周围空气等,是典型的气、液、固三相流。基于CFD-DPM方法,采用欧拉双流体模型模拟气相和水相,采用拉格朗日模型追踪喷浆过程产生的粉尘,研究了多种工况喷雾作用下粉尘的扩散过程,分析了粉尘运移及分布特性,获得了喷雾角度与流量对粉尘分布的影响规律。喷射角度的变化对粉尘扩散的影响主要集中在中下部区域,控制喷雾流量可有效降低区域粉尘,为合理降尘、提高喷射效率提供了理论支持。

关键词：喷射过程粉尘扩散气固液三相流 CFD-DPM方法

Temperature-induced deformation of CRTS II slab track and its effect on track dynamical properties

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Science China(Technological Sciences) 2014年第10期57卷 1917-1924页

作者： song xiaolin ZHAO ChunFa ZHU XiaoJia State Key Laboratory of Traction Power Southwest Jiaotong University

Two finite-element models of the CRTS II slab track are presented to simulate temperature-induced deformations of the concrete track slab with no deterioration or with a deteriorated cement asphalt mortar(CAM).One model,which considers the fully bonding interface between the slab and the CAM layer,could applied to a track that is in good condition;the other model uses cohesive zone elements to simulate the deteriorated CAM with some possible interfacial separation and *** both of the models,temperature-induced warp deformations of track under various temperature loads are *** influence of temperature deformation on the dynamic properties of the track is analyzed based on the train-track coupled *** results show that the deteriorated CAM layer can significantly increase temperature deformations of a CRTS II track slab,which would produce tiny rail *** are clear differences between the deformation shapes of the track slabs that have an inseparable mortar layer and those have a separable mortar *** track slab with a deteriorated mortar layer showed more open curl distortion than the track slab in good *** dynamical response index of the slab track is intensified to a certain level due to the temperature deformation;with an increase of the train speed,the track dynamical responses increased ***,rail irregularities due to the temperature deformations are very *** if a track is exposed to extreme temperature loads and the mortar layer is deteriorated,temperature deformation can have a negligible effect on the track’s dynamical properties.

关键词： high-speed railway temperature deformation slab track dynamical properties

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毛坪铅锌矿采场热环境影响因素研究

矿业科学学报 2024年第2期9卷 270-277页

作者：康建宏田佳阔吴云韬崔数文李晴宋小林中国矿业大学安全工程学院江苏徐州221116 彝良驰宏矿业有限公司云南昭通657000

矿井热害是矿井深部开采面临的重要问题。以毛坪铅锌矿为工程案例,采用现场测试与数值模拟相结合的方法,研究了不同热源对深部矿井采场热环境的影响。基于现场实测的采场地温梯度与热环境参数,构建了毛坪铅锌矿采场物理模型,采用COMSOL... 详细信息

矿井热害是矿井深部开采面临的重要问题。以毛坪铅锌矿为工程案例,采用现场测试与数值模拟相结合的方法,研究了不同热源对深部矿井采场热环境的影响。基于现场实测的采场地温梯度与热环境参数,构建了毛坪铅锌矿采场物理模型,采用COMSOL软件分析了较低地温条件下风流温度、人体热源、机电设备以及充填体四种热源对采场及围岩温度的影响,并通过现场温度测量数据对数值计算结果进行验证。结果表明:毛坪铅锌矿目前开采水平地温为21.60℃,地温梯度为1.66℃/hm;灰砂比是影响充填体放热的重要因素,充填体产生的热量不仅会借助风流直接传至采场,还能通过围岩传导至巷道壁面,造成采场温度升高;地温对采场温度影响较大,采场温度随着地温的增大呈线性增加;毛坪铅锌矿中各个热源对采场环境的影响程度不同,其中风流能显著提高采场温度,充填体和机电设备次之,人体热源对采场温度的影响最小。

关键词：采场热环境低地温充填体风流温度数值模拟

Parameter Effects of the Potential‑Field‑Driven Model Predictive Controller for Shared Control

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Automotive Innovation 2023年第1期6卷 48-61页

作者： Mingjun Li Chao Jiang xiaolin song Haotian Cao State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

Parameter effects of the potential-field-driven model predictive control(PF-MPC)method on performances of shared control systems during obstacles avoidance are *** PF-MPC controllers of autonomous driving and shared control systems are designed based on the constructed potential fields and model predictive control method,and the driver-vehicle dynamics and the driver-related costs are also considered in the design of the shared *** explore a potential approach of alleviating driver-automation conflicts of the shared control systems,different motion planning results generated by the PF-MPC controller are explored by adjusting effects of potential fields’parameters,which provides possibilities to decrease driver-automation conflicts between the planned trajectory and driver’s target ***,two case studies are designed to discuss different frameworks and parameters effects on shared control *** show that the proposed shared control frameworks considering driver-vehicle dynamics and the driver-related cost show better performances regarding driver-automation conflicts management and driving safety than the decentralized control *** the longitudinal normalized constant of potential fields parameters shows influences on the driver-automation conflicts management and driving safety performances of shared control.

关键词： PF-MPC method Potential field Parameter effect Driver-automation conflict

Runoff Change of Naoli River in Northeast China in 1955–2009 and Its Influencing Factors

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Chinese Geographical Science 2012年第2期22卷 144-153页

作者： song xiaolin LU Xianguo LIU Zhengmao SUN Yonghe Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sci- ences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beij＇ing 100049 China Heilongjiang Agricultural Reclamation Survey Design and Research Institute Harbin 150090 China Jiamusi Hydrological Bureau in Heilongjiang Province Jiamusi 154000 China

Runoff change and trend of the Naoli River Basin were studied through the time series analysis using the data from the hydrological and meteorological stations. Time series of hydrological data were from 1957 to 2009 for Bao′an station, from 1955 to 2009 for Baoqing station, from 1956 to 2009 for Caizuizi station and from 1978 to 2009 for Hongqiling station. The influences of climate change and human activities on runoff change were investigated, and the causes of hydrological regime change were revealed. The seasonal runoff distribution of the Naoli River was extremely uneven, and the annual change was great. Overall, the annual runoff showed a significant decreasing trend. The annual runoff of Bao′an, Baoqing, and Caizuizi stations in 2009 decreased by 64.1%, 76.3%, and 84.3%, respectively, compared with their beginning data recorded. The wet and dry years of the Naoli River have changed in the study period. The frequency of wet year occurrence decreased and lasted longer, whereas that of dry year occurrence increased. The frequency of dry year occurrence increased from 25.0%-27.8% to 83.9%-87.5%. The years before the 1970s were mostly wet, whereas those after the 1970s were mostly dry. Precipitation reduction and land use changes contributed to the decrease in annual runoff. Rising temperature and water project construction have also contributed important effects on the runoff change of the Naoli River.

关键词： runoff change hydrological parameters wetland land use human activities Naoli River

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矿井通风系统综合评价指标体系与方法

矿业安全与环保 2024年第2期51卷 25-32,39页

作者：蒋合国崔数文谭鹏程魏筱乐魏连江宋小林彝良驰宏矿业有限公司云南昭通657000 中国矿业大学安全工程学院江苏徐州221116

对矿井通风系统进行科学合理的综合评价是矿井通风系统优化与调整的重要依据,目前仍未形成公认的综合评价指标体系与方法。针对矿井通风系统综合评价中存在指标体系的确定不够合理、权重维护困难等问题,采用理论分析、文献分析等方法,... 详细信息

对矿井通风系统进行科学合理的综合评价是矿井通风系统优化与调整的重要依据,目前仍未形成公认的综合评价指标体系与方法。针对矿井通风系统综合评价中存在指标体系的确定不够合理、权重维护困难等问题,采用理论分析、文献分析等方法,从矿井通风系统组成要素、性质、能力等3个角度,“通风动力、通风网络、通风设施”“安全可靠性、经济合理性”“保障能力、防灾能力、抗灾能力”等8个维度选取10项评价指标构建矿井通风系统综合评价指标体系。该评价指标体系可以从多角度、多维度全面反映被评价对象的综合情况,抓住主要因素,确保综合评价的全面性和可信度。同时,提出了以等距分级、等比赋权进行排序打分的权重确定方法,即专家排序指数赋权法,以快速确定与维护评价权重,使评价结果具有客观性,又易于操作。

关键词：矿井通风多角度多维度综合评价评价指标体系权重确定方法