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Frequency-Domain Full-Waveform Inversion Based on Tunnel Space Seismic Data

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Engineering 2022年第11期18卷 197-206页

作者： Mingyu Yu Fei Cheng jiangping liu Daicheng Peng Zhijian Tian Hubei Subsurface Multiscale Imaging Key Laboratory(SMIL) Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China

Tunnel seismic detection methods are effective for obtaining the geological structure around the tunnel face,which is critical for safe construction and disaster mitigation in tunnel engineering.However,there is often a lack of accuracy in the acquired geological information and physical properties ahead of the tunnel face in the current tunnel seismic detection methods.Thus,we apply a frequency-domain acoustic full-waveform inversion(FWI)method to obtain high-resolution results for the tunnel structure.We discuss the influence of the frequency group selection strategy and the tunnel observation system settings regarding the inversion results and determine the structural imaging and physical property parameter inversion of abnormal geological bodies ahead of the tunnel face.Based on the conventional strategies of frequency-domain acoustic FWI,we propose a frequency group selection strategy that combines a low-frequency selection covering the vertical wavenumber and a high-frequency selection of antialiasing.This strategy can effectively obtain the spatial structure and physical parameters of the geology ahead of the tunnel face and improve the inversion resolution.In addition,by linearly increasing the side length of the tunnel observation system,we share the influence of the length of the two sides of the observation systems of different tunnels on the inversion results.We found out that the inversion results are the best when the side length is approximately five times the width of the tunnel face,and the influence of increasing the side observation length beyond this range on the inversion results can be ignored.Finally,based on this approach,we invert for the complex multi-stratum model,and an accurate structure and physical property parameters of the complex stratum ahead of the tunnel face are obtained,which verifies the feasibility of the proposed method.

关键词： Tunnel seismic detection Full-waveform inversion Frequency select strategy Observation system

机械振动对电弧增材制造2319铝合金微观组织与机械性能的影响

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河北科技大学学报 2024年第2期45卷 189-197页

作者：张亮卞文卓卢佳豪刘江平河北科技大学材料科学与工程学院河北石家庄050018 苏州工业职业技术学院精密制造工程系江苏苏州215104

为了解决电弧增材制造试样晶粒粗大、机械性能较差等问题,在电弧增材制造2319铝合金过程中施加机械振动,分析了机械振动频率和幅度对试样微观组织和机械性能的影响。结果显示:机械振动使熔池流动性提高,熔池更加铺展,层宽增加,层高降低... 详细信息

为了解决电弧增材制造试样晶粒粗大、机械性能较差等问题,在电弧增材制造2319铝合金过程中施加机械振动,分析了机械振动频率和幅度对试样微观组织和机械性能的影响。结果显示:机械振动使熔池流动性提高,熔池更加铺展,层宽增加,层高降低;振动破碎了生长过程中的枝晶,使INZ晶粒尺寸减小14.49μm,ITZ晶粒尺寸减小4.68μm;枝晶间隙处的溶质元素含量降低,晶界析出相变得断续且细小,PLC效应间隔增加,材料延伸率显著提高;机械振动频率和机械振动幅度改变时纵向和横向延伸率分别提升了38.2%,15.7%和29.3%,52.5%,而强度变化并不显著。采用机械振动辅助电弧增材制造能够在不影响强度的前提下显著提高试样的塑性,可为机械振动在增材制造领域的广泛应用提供技术参考。

关键词：焊接工艺与设备电弧增材制造机械振动微观组织机械性能

箔冶金法制备的SiC_(f)/TiAl复合材料微观组织研究

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金属加工（热加工） 2024年第7期 105-109页

作者：刘江平王佳王锟苏州工业职业技术学院精密制造工程系江苏苏州215104

将钛箔与夹有SiC纤维的铝箔交替叠置,在650℃×5h+1000℃×3h+1320℃×2h的条件下真空热压,制备了SiC_(f)/TiAl复合材料板材。板材的基体为α_(2)/γ全片层组织,在基体-纤维-基体交界的部分位置有“耳”状孔洞产生。基体和SiC纤维之间... 详细信息

关键词： SiC_(f)/TiAl复合材料显微组织界面反应

Power Purchase Model of Provincial Grids Based on Diverse Energy Coordination Hedging Optimization

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Journal of Power and Energy Engineering 2014年第4期2卷 463-469页

作者： Dunnan liu Yujie Xu Weimin Zeng jiangping liu Min Fan Xinming liu School of Economics and Management North China Electric Power University Beijing China Hubei Provincial Electric Power Company Power Exchange Center Wuhan China

Under the background of energy conservation, the grid companies should give priority to consumptive hydropower, wind power and other clean electricity to fulfill their social responsibility and promote the carbon emission reduction in power industry. But under the current power purchase mode, grid companies must first perform the contract. This is extremely uneconomical and not environmentally friendly. Based on hedging theory, this paper proposes a power purchase optimization model using the strategy of “compression and compensation”. If outer price is lower than the contract price, the grid can compress contract power appropriately, leaving more space for purchasing electricity;if outer price is not attractive enough, the grid should timely improve contract proportion, compensating the deviations of contract caused by "compression". Based on the strategy of "compression and compensation", it can effectively reduce the abandoned wind and water, enhance the economic and social benefits of provincial power grid.

关键词： Power Purchase Optimization Hedging "Compression and Compensation" Large-Scale System Decomposition-Coordination

A Study on the Agricultural Scientific Research Management in the New Situation

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Asian Agricultural Research 2017年第9期9卷 22-23,27页

作者： Ximei SONG Xuelian SANG jiangping liu Jiaying CHEN Key Laboratory of Tropical Fruit Biology Ministry of Agriculture/South Subtropical Crops Research InstituteChinese Academy of Tropical Agricultural Sciences

As the core of the management of agricultural institutes,scientific research management plays a vital role in strategic development,and also affects the strategic development of agricultural research institutes. This paper expounds the connotation and characteristics of agricultural scientific research management as well as management ability requirements of management personnel. This paper puts forward the recommendations for improving agricultural scientific research management from the view of management personnel.

关键词： Agricultural scientific research management Management personnel Recommendations

超短时线性台阵背景噪声成像技术在浅层地质结构探测中的应用

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地球物理学进展 2024年第1期39卷 63-76页

作者：敬嘉良陈国雄程飞丹阳刘江平徐富文王德涛地质过程与矿产资源国家重点实验室中国地质大学(武汉)武汉430074 中国地质大学(武汉)资源学院武汉430074 中国地质大学(武汉)海洋学院武汉430074 中国地质大学(武汉)地球物理与空间信息学院武汉430074 湖北省地质局第一地质大队大冶435000

背景噪声地震成像方法已被广泛应用于探测壳幔深部结构;近些年来,该方法在浅地表结构成像中的应用研究也在蓬勃发展,然而近地表场源不均匀等因素导致高频面波信号往往难以准确恢复,以牺牲时间来提高信噪比的观测方式会极大限制其在工程... 详细信息

背景噪声地震成像方法已被广泛应用于探测壳幔深部结构;近些年来,该方法在浅地表结构成像中的应用研究也在蓬勃发展,然而近地表场源不均匀等因素导致高频面波信号往往难以准确恢复,以牺牲时间来提高信噪比的观测方式会极大限制其在工程勘查中的应用.本文尝试讨论超短时背景噪声成像技术在浅层地质结构探测中的应用效果.笔者利用湖北应城地区超短时(1 h)线性台阵地震背景噪声记录,使用被动源面波多道分析法从虚拟炮集中提取相速度频散曲线,通过反演获取了浅地表二维横波速度结构.结果表明,利用本文方案可以恢复高信噪比面波信号、获取高信噪比的频散能量以及拾取高精度相速度;反演速度结构与实际测井数据吻合度好,成像结果有效揭示了测区150 m以浅的地层结构,证明了超短时背景噪声成像技术在浅层地质结构调查中具有很大的应用潜力.

关键词：背景噪声超短时频散曲线浅层地质结构横波速度反演

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跨企业订单班人才培养的探索

模具制造 2024年第7期24卷 47-49页

作者：刘江平王佳张英琦许岚朱伟苏州工业职业技术学院江苏苏州215104

跨企业订单班由不同的企业和学校共同组建,旨在为成员企业培养符合要求的定向人才。相对于传统的订单班而言,跨企业订单班具有育人成本低、育人质量高和符合产业需求等优点。从组建、组织管理、人才培养方案制定与教学实施和订单班的考... 详细信息

跨企业订单班由不同的企业和学校共同组建,旨在为成员企业培养符合要求的定向人才。相对于传统的订单班而言,跨企业订单班具有育人成本低、育人质量高和符合产业需求等优点。从组建、组织管理、人才培养方案制定与教学实施和订单班的考核与评价等方面介绍了跨企业订单班的实施路径。

关键词：跨企业订单班人才培养校企合作

MPI/OpenMP-Based Parallel Solver for Imprint Forming Simulation

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 461-483页

作者： Yang Li jiangping Xu Yun liu Wen Zhong Fei Wang School of Mechanical Engineering Jiangsu UniversityZhenjiang212016China School of Mechanical Engineering Wuhan Polytechnic UniversityWuhan430023China Shenyang Mint Company Limited Shenyang110092China

In this research,we present the pure open multi-processing(OpenMP),pure message passing interface(MPI),and hybrid MPI/OpenMP parallel solvers within the dynamic explicit central difference algorithm for the coining process to address the challenge of capturing fine relief features of approximately 50 microns.Achieving such precision demands the utilization of at least 7 million tetrahedron elements,surpassing the capabilities of traditional serial programs previously developed.To mitigate data races when calculating internal forces,intermediate arrays are introduced within the OpenMP directive.This helps ensure proper synchronization and avoid conflicts during parallel execution.Additionally,in the MPI implementation,the coins are partitioned into the desired number of regions.This division allows for efficient distribution of computational tasks across multiple processes.Numerical simulation examples are conducted to compare the three solvers with serial programs,evaluating correctness,acceleration ratio,and parallel efficiency.The results reveal a relative error of approximately 0.3%in forming force among the parallel and serial solvers,while the predicted insufficient material zones align with experimental observations.Additionally,speedup ratio and parallel efficiency are assessed for the coining process simulation.The pureMPI parallel solver achieves a maximum acceleration of 9.5 on a single computer(utilizing 12 cores)and the hybrid solver exhibits a speedup ratio of 136 in a cluster(using 6 compute nodes and 12 cores per compute node),showing the strong scalability of the hybrid MPI/OpenMP programming model.This approach effectively meets the simulation requirements for commemorative coins with intricate relief patterns.

关键词： Hybrid MPI/OpenMP parallel computing MPI OpenMP imprint forming

Cyclometalated Ir（Ⅲ） chaperone complexes of curcumin as light-activated prodrugs for cancer therapy

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Cyclometalated Ir（Ⅲ） chaperone complexes of curcumin as l...