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基于时序InSAR技术的工业园区地表形变监测

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测绘通报 2024年第6期 157-163页

作者：黄标张辉尹剑辉广东省科学院广州地理研究所广东广州510070 兰州理工大学土木工程学院甘肃兰州730000

工业园区作为城市经济发展的核心区,对园区进行地表形变监测尤为重要。目前,对工业园区形变机制的研究较少,且传统的监测手段成本高、效率低。因此,本文提出利用时序合成孔径雷达干涉测量(InSAR)技术构建园区的综合监测模型,在提升监测... 详细信息

工业园区作为城市经济发展的核心区,对园区进行地表形变监测尤为重要。目前,对工业园区形变机制的研究较少,且传统的监测手段成本高、效率低。因此,本文提出利用时序合成孔径雷达干涉测量(InSAR)技术构建园区的综合监测模型,在提升监测效率的同时节约了成本。以白银区银西工业园为例,基于2018年6月—2021年4月34景Sentinel-1A数据,利用StaMPS-PS与SBAS-InSAR技术获取了园区地表形变信息,并对两种技术获取的形变信息从时空分布的角度进行交叉验证。结果表明,两种技术获取的形变特征点均对应于实地勘察照片中形变位置,再利用585个相同经纬度点进行精度验证,发现两者相关性较好,决定系数R^(2)达0.82,均方根误差RMSE为2.20 mm/a,形变速率范围也高度一致。由于StaMPS-PS技术识别出的形变点数量比SBAS-InSAR技术多47%,因此StaMPS-PS技术在园区的适用性更好。最后分析并讨论了园区地表形变的地质条件及诱因,为更好了解园区形变机制及预警灾害发生提供了参考依据。

关键词： StaMPS-PS SBAS-InSAR 地表形变 WOA-BP神经网络银西工业园区

基于工业互联网架构的煤矿瓦斯智能抽采管控系统设计

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工矿自动化 2024年第2期50卷 28-34页

作者：尹建辉陕西煤业化工技术研究院有限责任公司陕西西安710065 渭南陕煤启辰科技有限公司陕西渭南714000 煤炭绿色安全高效开采国家地方联合工程研究中心陕西西安710065

目前煤矿瓦斯智能抽采管控系统存在以下问题:①系统功能局限于某一段流程管控,导致瓦斯抽采业务管理覆盖不全、措施落实不到位。②基于传统的“烟囱式”IT架构,导致子系统分散、数据利用率低、协同能力差,后期子系统融合代价大、系统扩... 详细信息

目前煤矿瓦斯智能抽采管控系统存在以下问题:①系统功能局限于某一段流程管控,导致瓦斯抽采业务管理覆盖不全、措施落实不到位。②基于传统的“烟囱式”IT架构,导致子系统分散、数据利用率低、协同能力差,后期子系统融合代价大、系统扩展不便。③瓦斯抽采过程仍存在较多的人工环节,系统智能化、自动化能力还有待进一步提升。针对上述问题,设计了一种基于工业互联网架构的煤矿瓦斯智能抽采管控系统。基于发布/订阅模式开发了瓦斯抽采多源异构数据采集流程,促进了数据的解耦和共享,降低了系统复杂度,实现了瓦斯抽采管网数据、钻孔作业及轨迹数据、设备工况数据、达标评判数据等多源异构数据的统一采集。基于数字孪生技术,构建了三维抽采系统模型,达到了井上下抽采系统的立体化展示。基于规则引擎技术,根据订阅的Topic对经过消息中心处理后的传感器数据进行判断,可进行告警消息的推送,并将处理后的传感器数据存入数据库中,以实现瓦斯抽采达标评判的自动化、流程化运行。利用机器视觉视频分析技术识别钻杆根数,从而实现钻孔过程的钻杆根数(钻孔深度)的自动计数和钻孔工程的信息化管理,结合钻孔测量仪器,实现了钻孔轨迹左右、上下偏差分析及可视化。现场应用结果表明:瓦斯抽采相关管理人员通过查看瓦斯智能抽采管控系统软件,可实时快速地了解各抽采面抽采情况、抽采评判情况、钻孔工程施工情况、系统故障情况,提高了瓦斯抽采信息化和智能化管理水平。

关键词：工业互联网煤矿瓦斯抽采智能管控软件机器视觉技术数字孪生技术

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基于PFC的放顶煤放煤机理数值模拟

陕西煤炭 2024年第2期43卷 6-11页

作者：尹建辉徐文全耿耀强陕西煤业化工技术研究院有限责任公司陕西西安710065 渭南陕煤启辰科技有限公司陕西渭南714000 煤炭绿色安全高效开采国家地方联合工程研究中心陕西西安710065

基于PFC颗粒流数值模拟软件,分别模拟了0.6 m、1.2 m、1.8 m这3种放煤步距,结果显示这3种放煤步距放出率分别为86%、83%、74%,含矸率分别为12%、6%、2%。从顶煤的运动特征和接触力场变化规律论述了放煤动态多层位拱结构的发育过程及机理... 详细信息

基于PFC颗粒流数值模拟软件,分别模拟了0.6 m、1.2 m、1.8 m这3种放煤步距,结果显示这3种放煤步距放出率分别为86%、83%、74%,含矸率分别为12%、6%、2%。从顶煤的运动特征和接触力场变化规律论述了放煤动态多层位拱结构的发育过程及机理,发现顶煤的放出过程是一个多层位拱结构不断形成、破坏的动态过程,会形成一个动态多层位拱结构;而不同位置的顶煤运移空间受限程度不同,导致不同位置顶煤运动状态不同,当拱结构上方矿山压力大于拱结构内顶煤颗粒之间摩擦力时,拱结构遭到破坏;由于位于拱顶的顶煤运移速度远大于两侧拱脚,导致拱结构的拱顶层位不断向上发育,从而形成高层位的拱结构,涌向放煤口的顶煤可能在放煤口形成低层位的拱结构。研究认为,沿工作面走向顶煤放出体应是一个连续的放煤椭球体,合理的放煤步距应为一个椭球体的宽度,并通过模拟试验证明了通过支架尾梁摆动破拱能够有效提高放煤效率。

关键词：放顶煤放煤步距顶煤成拱放煤机理拱结构

基于GEM-AHP-可拓学高校图书馆用户满意度分析

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黑龙江科学 2024年第9期15卷 62-67页

作者：高娈李远陈伟尹建辉哈尔滨工程大学经济管理学院哈尔滨150001 黑龙江东方学院哈尔滨150066

为探索图书馆用户满意度影响因素,实现高校图书馆综合服务水平提升,推动高校图书馆发展,运用群组决策特征根法(GEM)对初选指标进行筛选,建立关键指标体系并构建AHP判断矩阵。运用AHP确定满意度因素权重排序,按其权重值排序进行有针对性... 详细信息

为探索图书馆用户满意度影响因素,实现高校图书馆综合服务水平提升,推动高校图书馆发展,运用群组决策特征根法(GEM)对初选指标进行筛选,建立关键指标体系并构建AHP判断矩阵。运用AHP确定满意度因素权重排序,按其权重值排序进行有针对性的措施,运用可拓学确定各因素满意度等级。研究结果表明,在高校图书馆用户满意度指标体系中,图书馆环境与读者空间方面表现良好,图书馆资源、图书馆服务、基础设备、图书管理员方面存在一定的问题。

关键词：高校图书馆用户满意度群组决策特征根层次分析物元可拓学

Cation-induced assembly of Zn(Ⅱ),Cd(Ⅱ) and Hg(Ⅱ) coordination complexes and DFT calculations to evaluate weak interactions between the helical chains

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Science China Chemistry 2011年第1期54卷 173-179页

作者： GENG WenQian LI XianLei yin jianhui KE WeiZai HAO Fuyin XU GuoYi ZHOU HongPing WU Jieying TIAN YuPeng Department of Chemistry Anhui University Hefei 230039 China State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210093 China

Two new coordination polymers [ZnLI2]∞ （1） and [CdLI2]∞ （2）（L： 3,6-di-（1,2,4-triazole-l-yl）-N-hexylcarbazole） were syn- thesized and their crystal structures were determined by single-crystal X-ray diffraction techniques. Complexes are both constructed with the helical chains along the 2l screw axis. The coordination bond, C-H...I weak interactions and π-π interactions play significant roles in constructing their 3D or 2D frameworks. Two different DFT calculations are performed for the weak interactions between the helical chains of the three different coordination polymers （[ZnLI2]∞[CdLI2]∞, and the reported [HgLI2]∞）. The results reveal that weak interactions play important roles in these supramolecular systems of helical configuration, namely, the trend is the shorter H…I distance and π-π stacking distance, the stronger the intermolecular interactions. The photoluminescence of the complexes measured in the solid state at room temperature indicates that the emission intensity varies extensively, which can be rationalized by the heavy atom effect. helical configuration, weak interactions, DFT calculations, photoluminescence

关键词： helical configuration weak interactions DFT calculations photoluminescence

Digital twin driven and intelligence enabled content delivery in end-edge-cloud collaborative 5G networks

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Digital Communications and Networks 2024年第2期10卷 328-336页

作者： Bo Yi jianhui Lv Xingwei Wang Lianbo Ma Min Huang College of Computer Science and Engineering Northeastern UniversityShenyang110169China Pengcheng Lab. Shenzhen518055China College of Software Northeastern UniversityShenyang110819China College of Information Science and Engineering Northeastern UniversityShenyang110819China

The rapid development of 5G/6G and AI enables an environment of Internet of Everything(IoE)which can support millions of connected mobile devices and applications to operate smoothly at high speed and low ***,these massive devices will lead to explosive traffic growth,which in turn cause great burden for the data transmission and content *** challenge can be eased by sinking some critical content from cloud to *** this case,how to determine the critical content,where to sink and how to access the content correctly and efficiently become new *** work focuses on establishing a highly efficient content delivery framework in the IoE *** particular,the IoE environment is re-constructed as an end-edge-cloud collaborative system,in which the concept of digital twin is applied to promote the *** on the digital asset obtained by digital twin from end users,a content popularity prediction scheme is firstly proposed to decide the critical content by using the Temporal Pattern Attention(TPA)enabled Long Short-Term Memory(LSTM)***,the prediction results are input for the proposed caching scheme to decide where to sink the critical content by using the Reinforce Learning(RL)***,a collaborative routing scheme is proposed to determine the way to access the content with the objective of minimizing *** experimental results indicate that the proposed schemes outperform the state-of-the-art benchmarks in terms of the caching hit rate,the average throughput,the successful content delivery rate and the average routing overhead.

关键词： Digital twin IoE Content delivery Caching Routing

A hybrid memory architecture supporting fine-grained data migration

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Frontiers of Computer Science 2024年第2期18卷 31-41页

作者： Ye CHI jianhui YUE Xiaofei LIAO Haikun LIU Hai JIN National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabCluster and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Department of Computer Science Michigan Technological UniversityMichigan 49931USA

Hybrid memory systems composed of dynamic random access memory(DRAM)and Non-volatile memory(NVM)often exploit page migration technologies to fully take the advantages of different memory *** previous proposals usually migrate data at a granularity of 4 KB pages,and thus waste memory bandwidth and DRAM *** this paper,we propose Mocha,a non-hierarchical architecture that organizes DRAM and NVM in a flat address space physically,but manages them in a cache/memory *** the commercial NVM device-Intel Optane DC Persistent Memory Modules(DCPMM)actually access the physical media at a granularity of 256 bytes(an Optane block),we manage the DRAM cache at the 256-byte size to adapt to this feature of *** design not only enables fine-grained data migration and management for the DRAM cache,but also avoids write amplification for Intel Optane *** also create an Indirect Address Cache(IAC)in Hybrid Memory Controller(HMC)and propose a reverse address mapping table in the DRAM to speed up address translation and cache ***,we exploit a utility-based caching mechanism to filter cold blocks in the NVM,and further improve the efficiency of the DRAM *** implement Mocha in an architectural *** results show that Mocha can improve application performance by 8.2%on average(up to 24.6%),reduce 6.9%energy consumption and 25.9%data migration traffic on average,compared with a typical hybrid memory architecture-HSCC.

关键词： non-volatile memory hybrid memory system data migration fine-grained caching

Impact resistance performance and optimization of the sand-EPE composite cushion in rock sheds

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Journal of Mountain Science 2024年第2期21卷 676-689页

作者： YU Bingxin ZHOU Xiaojun TANG jianhui ZHANG Yujin ZHANG Yuefeng School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

Rock sheds are widely used to prevent rockfall disasters along roads in mountainous *** improve the capacity of rock sheds for resisting rockfall impact,a sand and expandable polyethylene(EPE)composite cushion was proposed.A series of model experiments of rockfall impact on rock sheds were conducted,and the buried depth of the EPE foam board in the sand layer was *** impact load and dynamic response of the rock shed were *** results show that the maximum impact load and dynamic response of the rock shed roof are all significantly less than those of the sand ***,as the distance between the EPE foam board and rock shed roof decreases,the maximum rockfall impact force and impact pressure gradually decrease,and the maximum displacement,acceleration and strain of the rock shed first decrease and then change *** addition,the vibration acceleration and vertical displacement of the rock shed roof decrease from the centre to the edge and decrease faster along the longitudinal direction than that along the transverse *** conclusion,the buffering effect of the sand-EPE composite cushion is better than that of the pure sand cushion,and the EPE foam board at a depth of 1/3 the thickness of the sand layer is appropriate.

关键词： Rockfall Rock shed Impact Composite cushion Buffering effect Dynamic response

A Method for Evaluating the Maximum Bending Degree of Flexural Toppling Rock Masses Based on the Rock Tensile Strain-Softening Model

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Journal of Earth Science 2024年第4期35卷 1243-1253页

作者： Jiongchao Wang Jun Zheng Jichao Guo Qing Lü jianhui Deng Department of Civil Engineering Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310007China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

Flexural toppling occurs when a series of layered rock masses bend towards their free *** is important to evaluate the maximum bending degree and the requirement of supports of flexural toppling rock mass to prevent rock mass cracking and even failure leading to a *** on the rock tensile strain-softening model,this study proposes a method for calculating the maximum curvature(C_(ppmax))of flexural toppling rock *** applying this method to calculate Cppmax of 9 types of rock masses with different hardness and rock layer thickness,some conclusions are drawn:(1)the internal key factors affecting C_(ppmax)are E^(⋆)(E^(⋆)=E_(ss)/E_(0),where E_(0)and E_(ss)are the mean deformation moduli of the rock before and after reaching its peak tensile strength,respectively),the strainεt corresponding to the tensile strength of rock,and the thickness(h)of rock layers;(2)hard rock layers are more likely to develop into block toppling than soft rock layers;and(3)thin rock layers are more likely to remain in flexural toppling state than thick rock *** addition,it is found that C_(ppmax)for flexural toppling rock masses composed of bedded rocks such as gneiss is related to the tensile direction.

关键词： flexural toppling rock mass maximum bending degree strain-softening model curvature rock mechanics