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Gravitational wave search by time-scale-recursive denoising and matched filtering

Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 166-182页

作者： Cunliang ma chenyang ma Zhoujian Cao Mingzhen Jia School of Information Engineering Jiangxi University of Science and TechnologyGanzhou341000China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing102206China School of Fundamental Physics and mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou310024China Jiangxi Provincial Key Laboratory of Multidimensional Intelligent Perception and Control Ganzhou341000China

In our previous work [Physical Review D,2024,109(4):043009],we introduced MSNRnet,a framework integrating deep learning and matched filtering methods for gravitational wave(GW) *** with end-to-end classification methods,MSNRnet is physically *** denoising models and astrophysical discrimination models corresponding to different parameter space were operated independently for the template prediction and *** the MSNRnet has a lot of computational *** this study,we propose a new framework for template prediction,which significantly improves our previous *** new framework consists of the recursive application of denoising models and waveform classification models,which solve the problem of computational *** waveform classification network categorizes the denoised output based on the signal's time *** enhance the denoising performance for long-time-scale data,we upgrade the denoising model by incorporating Transformer and ResNet ***,we introduce a novel training approach that allows for the simultaneous training of the denoising network and waveform classification network,eliminating the need for manual annotation of the waveform dataset required in our previous ***-data analysis results demonstrate that our new method decreases the false alarm rate by approximately 25%,boosts the detection rate by roughly 5%,and slashes the computational cost by around 90%.The new method holds potential for future application in online GW data processing.

关键词： gravitational wave matched filtering deep learning

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Development of EPDM composites reinforced by CNTs@SiO_(2)for thermal protection systems of aerospace propulsion:Significant improvement in oxidation and ablation resistance properties

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Chinese Journal of Aeronautics 2024年第2期37卷 471-481页

作者： Li WANG Jiang LI Kang LI Yiwei WANG chenyang ma Science and Technology on Combustion Internal Flow and Thermal-Structure LaboratoryNorthwestern Polytechnical UniversityXi’an 710072China

Carbon Nanotubes(CNTs)reinforced Polymer-matrix Composites(PMCs)is widely used as insulation materials in thermal protection system of aerospace ***,CNTs are prone to oxidation and have high thermal conductivities,which makes it difficult to improve the ablation resistance of insulation materials that contain ***_(2)was encapsulated onto the surface of CNTs(CNTs@SiO_(2)),which were then added to Ethylene Propylene Diene Monomer(EPDM)rubber to prepare the insulation *** analysis and ablation test were used to evaluate the resistance of the insulation materials to thermal oxidation and ***,scanning electron microscopy was performed to analyze their *** revealed that the addition of CNTs@SiO_(2)could visibly reduce the effects of hot corrosion and ablation on insulation *** C-CNTs@SiO_(2)-1 formulation had the best ablative ***,compared with the unencapsulated formulation(C-CNTs-10),the C-CNTs@SiO_(2)-1 formulation reduced the line ablation rate by 51%to 0.0130 mm/s after oxygen-acetylene ***,the ablation mechanism was investigated based on the effects of the CNTs@SiO_(2)additive on their ***,the improvement in ablation performance may be attributed to CNTs@SiO_(2)-induced decreases in thermal conductivity,improvement in the hot corrosion resistance in the char layer,and changes in the microstructure.

关键词： Polymer-matrix Composites(PMCs) Carbon Nanotubes(CNTs) Thermal properties Ablation Oxidation

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Theoretical and experimental study on the rheological properties of WIS grout and the dispersion and sealing mechanism

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International Journal of Mining Science and Technology 2022年第4期32卷 669-684页

作者： Mengmeng Zhou Shucai Li Zhuo Zheng Rentai Liu Mengjun Chen chenyang ma ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityClayton 3800Australia Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China

Recently a new grout material called water inflow sealing(WIS) was invented for sealing water inflow in tunneling and underground constructions. In this study, a special experimental method called intubated counter grouting(ICG) was proposed to investigate the influence of water dispersion on the rheological properties of the grout during the grouting process, and to testify the sealing performance of the grout,such as instant gelling ability(IGA) and anti-dispersion ability(ADA). In the experiment, dispersion was restricted in the downstream of the channel with a high turbulence intensity. The influences of ADA and IGA were therefore decoupled and evaluated separately. Experimental results revealed two distinctive sealing mechanisms of WIS. For a low initial velocity of water, WIS turned the shear flow of water into an overall movement of a plug by absorbing water into the particles. For a high initial velocity and the situation that the particles reached the outlet before sufficiently expanding, WIS modified the rheology of the water in the channel and reduced its velocity till the static state. The distinctive feature of WIS brings a reformation on the sealing mechanism and provides an effective way to control water inflow with high pressure and velocity.

关键词： WIS grout material Grouting treatment Water inflow Sealing mechanism Flow regularity

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Super-absorbent swellable polymer as grouting material for treatment of karst water inrush

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International Journal of Mining Science and Technology 2021年第5期31卷 753-763页

作者： Shucai Li chenyang ma Rentai Liu Mengjun Chen Jia Yan Zhenjun Wang Shaolong Duan Huasheng Zhang School of Civil Engineering Shandong UniversityJinan 250061China Geotechnical and Structural Engineering Research Centre Shandong UniversityJinan 250061China School of Qilu Transportation Shandong UniversityJinan 250002 China

Grouting is the most commonly used method to control water inrush in underground *** cement-based materials are easy to dilute and hard to coagulate under the influence of large flow and high-velocity water *** address these deficiencies,a new type of polymer grouting material with an excellent expansion ratio was *** material quickly absorbs water and has an expansion ratio of 1:*** material is composed of a superabsorbent polymer(SAP),glycerol,and *** effects of water quality on the expansion ratio and expansion rate of the material were examined,and the best solid–liquid ratio for the slurry was determined by fluidity measurements.A karst specially designed pipeline water inrush test device showed that 800 g of SAP can achieve 0.6 m/s water flow blockage in the smooth pipeline,demonstrating that the ability of the SAP slurry to block water inrush is superior to those of other *** study provides a reference for water inrush plugging,and has important implications for the reduction and control of karst pipeline-type water inrush disasters,ensuring the safety of construction sites and preventing loss of life and damage to property.

关键词： Karst Water inrush Model test Grouting material Superabsorbent polymer

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Model construction and numerical simulation of arterial remodeling after stent implantation with variations of cell concentration

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Medicine in Novel Technology and Devices 2022年第4期16卷 51-59页

作者： Yu Zhang Shiliang Chen Hanbing Zhang chenyang ma Tianming Du Aike Qiao Beijing International Science and Technology Cooperation Base for Intelligent Physiological Measurement and Clinical Transformation Beijing University of TechnologyBeijing100124China

Differences in concentration of molecules can cause different molecular *** issue has not been well studied in the vascular remodeling process with regards to is-stent *** study designed and built a model to explore the effect of differences in vascular cell concentration on vascular *** element analysis(FEA)models and the agent-based models(ABMs)were established to simulate the damage and proliferation process of vascular smooth muscle cells(VSMCs)caused by coronary artery stent *** FEA model simulated the expansion of the stent in the coronary artery,the tensile stress was captured and imported into the ABM,and the damaged VSMCs proliferated to reduce their damage *** were randomly distributed within a defined domain,and the number of VSMCs in a unit volume(or area)was defined as the concentration of *** with the smallest concentration of VSMCs will preferentially proliferate,which simulates the cell proliferation affected by the concentration of *** results showed that after stent implantation,VSMCs proliferated gradually from the severely damaged stent area to the lumen until the artery reached a steady *** comparison,the loss of arterial lumen and the number of newly grown VSMCs were greater in the presence of the concentration than in its *** made full use of the lumen space under the influence of concentration differences,so the concentration was of great significance to vascular remodeling.

关键词： Numerical simulation Agent-based model Finite element method Vascular remodeling Cell concentration

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自由面数量对水下钻孔爆破振动信号能量分布及衰减规律的影响

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爆炸与冲击 2022年第1期42卷 142-153页

作者：马晨阳吴立孙苗中国地质大学(武汉)岩土钻掘与防护教育部工程研究中心湖北武汉430074 中国地质大学(武汉)工程学院湖北武汉430074

针对自由面不仅影响爆破效果还影响爆破振动效应的问题,提出从能量角度探索自由面对水下爆破振动衰减规律的影响。以三峡大坝至葛洲坝水利枢纽河段水下钻孔爆破地震波现场监测数据为基础,结合SPH-FEM数值模拟技术和小波时频能量分析方法... 详细信息

针对自由面不仅影响爆破效果还影响爆破振动效应的问题,提出从能量角度探索自由面对水下爆破振动衰减规律的影响。以三峡大坝至葛洲坝水利枢纽河段水下钻孔爆破地震波现场监测数据为基础,结合SPH-FEM数值模拟技术和小波时频能量分析方法,对不同自由面数量的爆破振动信号的总能量、各频带间的能量分布特征及振动衰减规律进行了研究。结果表明:水下钻孔爆破具有低主频、短持时、快衰减的特点,爆破主频带主要集中在15.625~31.250 Hz;受单一自由面限制的水下开槽爆破,监测信号的爆炸能量主要以振动形式消耗,单自由面比振动能为13.14 mm^(2)/(kg·s^(2)),随着后续开挖爆破自由面数量的增加,双自由面和三自由面的比振动能分别降低至1.36和0.28 mm^(2)/(kg·s^(2)),频带质点峰值振动速度分别降低65%和37%,能量更多用于破碎和抛掷岩体,水下爆破振动主频由低频向高频带(31.25~62.50 Hz)发展。因此,在水下控制爆破设计时,需要考虑自由面数量对振动能量分布和衰减规律的影响,并利用这个特征,确定各段的控制药量,减少对周边建构物的共振危害。

关键词：水下钻孔爆破自由面时频分析振动衰减

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基于时频特征融合与GWO-ELM的棒控电源早期故障状态辨识方法

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仪器仪表学报 2023年第1期44卷 121-130页

作者：唐圣学马晨阳勾泽河北工业大学省部共建电工装备可靠性与智能化国家重点实验室天津300130

针对核电棒控系统电源(PWE)早期故障状态辨识问题,提出一种基于融合时域与时频域的故障特征和灰狼优化算法(GWO)的极限学习机(ELM)辨识方法。首先,根据棒控电源PWE工作原理和控制棒驱动机构的驱动电流,利用电流上升时间分析了早期波形... 详细信息

针对核电棒控系统电源(PWE)早期故障状态辨识问题,提出一种基于融合时域与时频域的故障特征和灰狼优化算法(GWO)的极限学习机(ELM)辨识方法。首先,根据棒控电源PWE工作原理和控制棒驱动机构的驱动电流,利用电流上升时间分析了早期波形形态与早期故障模式。然后,构建融合电流上升时间、均方根-差分和和小波包奇异熵的故障时频特征,分析了特征的可区分性。进而,采用GWO算法进行ELM分类器参数择优,建立GWO-ELM模型实现PWE早期故障状态的辨识,以提高辨识精度。最后,通过开展不同特征组合和辨识模型比对试验,结果表明所提方法能有效实现棒控电源早期故障识别诊断,且平均辨识准确度可达98.86%。

关键词：棒控电源早期故障状态辨识时域特征小波包奇异熵 GWO-ELM模型

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甲壳素纳米纤维增强明胶/壳聚糖复合膜的制备及性能研究

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材料导报 2017年第8期31卷 21-24页

作者：黄大建马宗红马晨阳王新伟兰州交通大学机电工程学院兰州730070

通过流延成膜法制备了不同甲壳素纳米纤维(CF)质量分数的CF/明胶(GA)/壳聚糖(CS)复合膜。利用透射电子显微镜(TEM)、扫描电子显微镜(FE-SEM)、紫外-可见光谱(UV-Vis)等对材料的结构与性质进行了研究。结果表明:低加入量CF在复合膜中分... 详细信息

通过流延成膜法制备了不同甲壳素纳米纤维(CF)质量分数的CF/明胶(GA)/壳聚糖(CS)复合膜。利用透射电子显微镜(TEM)、扫描电子显微镜(FE-SEM)、紫外-可见光谱(UV-Vis)等对材料的结构与性质进行了研究。结果表明:低加入量CF在复合膜中分散较好,高加入量CF在复合膜中会形成团聚,CF与GA/CS之间有相对较好的相容性;随着CF含量增加,复合膜拉伸强度呈现先增加而后减小的趋势,而断裂伸长率则随着CF含量增加而持续降低;同时复合膜的水蒸气吸附率和水溶失率都随着CF含量的上升而降低。CF/GA/CS纳米复合膜表现出良好的透明性,较少CF的加入对材料透明度影响不大。

关键词：甲壳素纳米纤维壳聚糖明胶力学性能耐水性

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基于category5月球内部结构模型的月球重力固体潮理论值计算

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地球物理学进展 2024年第2期39卷 471-479页

作者：马晨阳雷伟伟河南理工大学测绘与国土信息工程学院焦作454003

在地球、太阳和其他行星的引潮力的作用下,月球表面上任一点重力值将产生周期性的变化称为月球重力固体潮理论值.研究月球重力固体潮有助于我们更好地了解月球的内部结构、地壳运动以及月球的演化过程,这也为登月任务和月球探测提供了... 详细信息

在地球、太阳和其他行星的引潮力的作用下,月球表面上任一点重力值将产生周期性的变化称为月球重力固体潮理论值.研究月球重力固体潮有助于我们更好地了解月球的内部结构、地壳运动以及月球的演化过程,这也为登月任务和月球探测提供了重要的科学依据,帮助我们更好地探索和理解月球的特性和性质.本文阐明了月球重力固体潮形成原因,根据category5月球内部结构模型计算出月球重力潮汐因子,依据Newcomb理论,采用ELP2000-85解析星历和Eckhardt月球天平动模型,提出一个计算月球重力固体潮理论值的方法,选取Apollo11作为测站,以波形图的形式输出该测站一天、一个月、一年的月球重力固体潮理论值,并探索讨论月球重力固体潮与月震的关系.结果表明:该测站一天、一个月、一年的月球重力固体潮理论值,最大值分别为:-1309μGal、-1290μGal、-1277μGal;最小值分别为:-1343μGal、-2349μGal、-2349μGal;与地球重力固体潮(这里选择与Apollo11经度纬度相同的坐标作为测站相比),月球重力固体潮变化相对简单,但波动幅度较大;推测月球的重力固体潮与深源月震之间可能存在某种关联.

关键词：月球重力固体潮重力潮汐因子重力 category5月球内部结构模型

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水下钻孔爆破地震波信号的最优降噪光滑模型

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华南理工大学学报（自然科学版） 2019年第8期47卷 31-37页

作者：孙苗吴立周玉纯马晨阳汪煜烽中国地质大学(武汉)岩土钻掘与防护教育部工程研究中心//工程学院

在水下钻孔爆破地震波监测中,会因监测环境、测试系统及其他因素而导致实测地震波信号混有噪声.为了获得真实的爆破振动特性,文中对水下钻孔爆破地震波信号进行降噪处理.首先对含噪实测地震波信号进行补充集合经验模态分解,基于分解所... 详细信息

在水下钻孔爆破地震波监测中,会因监测环境、测试系统及其他因素而导致实测地震波信号混有噪声.为了获得真实的爆破振动特性,文中对水下钻孔爆破地震波信号进行降噪处理.首先对含噪实测地震波信号进行补充集合经验模态分解,基于分解所得的本征模态函数建立滤波算法;然后建立考虑滤波算法光滑性及其与实测信号之间误差标准差的目标函数,找到目标函数最优解对应的模型就是水下钻孔爆破地震波信号的最优降噪光滑模型;最后基于降噪误差比分析模型的降噪能力.结果表明,文中提出的地震波信号最优降噪光滑模型可用于水下钻孔爆破信号降噪中,该模型可以在保留原始信号真实成分的前提下对原始信号进行降噪处理.

关键词：水下钻孔爆破地震波监测补充集合经验模态分解本征模态函数信噪比

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