2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)最新文献

筛选
英文 中文
An accurate and efficient numerical tool for the analysis and design of optical feeder links 为光学馈线链路的分析和设计提供了一种精确、高效的数值工具
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10189928
Carla Cantore, Davide Monopoli, Angelo Altamura, A. Mengali, M. Grande
{"title":"An accurate and efficient numerical tool for the analysis and design of optical feeder links","authors":"Carla Cantore, Davide Monopoli, Angelo Altamura, A. Mengali, M. Grande","doi":"10.1109/MetroAeroSpace57412.2023.10189928","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10189928","url":null,"abstract":"The continuous demand for higher capacities as well as wider spectral bandwidth combined with the congestion of the RF licensed spectrum has drawn the attention to free-space optical (FSO) satellite networks. The exploitation of optical frequencies in the feeder link between ground stations and satellites will extend the terrestrial optical fiber network to space reaching a full optical network. In this scenario, this paper presents an accurate and efficient numerical tool able to support the analysis and design of optical feeder links (OFL), estimating links' performance in a computational efficient, flexible and accurate way taking into account the channel impact. As example, link budgets for GEO feeder link scenarios in uplink and downlink directions have been estimated through the developed tool. Among its capabilities, the tool makes use of a more accurate link distance evaluation, compared to the conventional approximation adopted in turbulence-related expressions, as well as the exact distance showing a relevant impact on the beam wander.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123023535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact detection on thin structures via machine learning approaches 基于机器学习方法的薄结构冲击检测
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10190034
F. Dipietrangelo, F. Nicassio, G. Scarselli
{"title":"Impact detection on thin structures via machine learning approaches","authors":"F. Dipietrangelo, F. Nicassio, G. Scarselli","doi":"10.1109/MetroAeroSpace57412.2023.10190034","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10190034","url":null,"abstract":"In this study, machine learning algorithms are trained and compared to identify and characterise impacts effects on typical aerospace panels with different geometries. Experiments are conducted to create a suitable impact dataset. Polynomial regression algorithms and shallow neural networks are applied to panels without stringers and optimised to test their ability to identify the impacts. The algorithms are then applied to panels reinforced with stringers, which represents a significant increase in complexity in terms of the dynamic characteristics of the system under test. The focus is not only on the detection of the impact position, but also on the severity of the event. The aim of the work is to demonstrate the validity of the application of machine learning to impact localization on realistic structures and to demonstrate the simplicity and efficiency of the computations despite the complexity of the test specimens.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122106867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Latent Neural Network For Recognition of Annomalies in 3D-Print of a Scale Model for Wind Tunnel Measurements 基于潜在神经网络的风洞测量模型3d打印异常识别
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10190049
Pawel Tomilo, J. Pytka, J. Józwik, E. Gnapowski, Tomasz Muszyński, A. Łukaszewicz
{"title":"Latent Neural Network For Recognition of Annomalies in 3D-Print of a Scale Model for Wind Tunnel Measurements","authors":"Pawel Tomilo, J. Pytka, J. Józwik, E. Gnapowski, Tomasz Muszyński, A. Łukaszewicz","doi":"10.1109/MetroAeroSpace57412.2023.10190049","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10190049","url":null,"abstract":"The paper concerns a new method of diagnosing and monitoring 3D printing processes based on measurements of kinematic parameters describing the movement of the 3D printer head. The aim of the research was to create a neural network model using unsupervised learning methods, whose task is to map signal characteristics (accelerometer and gyroscope data) to latent space. The measurement of significant quantities describing the kinematics of printer head movement was carried out during the execution of the given 3D print. The proposed latent artificial neural network algorithm was implemented in the microprocessor of the IMUMETER measuring device and tests were carried out during which the measuring system collected data and the neural network model mapped the features in such a way that it separated signals with anomalies from typical signals. The results allowed for the mapping of features and the analysis of the occurrence of anomalies on a sample printout of a wing section model for testing in a wind tunnel.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129302945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Innovative Airspeed Sensing Based on a Micromachined Sensor 基于微机械传感器的创新空速传感
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10189995
Vittoria Di Fiore, C. Conte, V. Bottino, D. Accardo, G. Rufino, G. de Alteriis, F. Passaniti, D. Patti, D. Sanfilippo
{"title":"Innovative Airspeed Sensing Based on a Micromachined Sensor","authors":"Vittoria Di Fiore, C. Conte, V. Bottino, D. Accardo, G. Rufino, G. de Alteriis, F. Passaniti, D. Patti, D. Sanfilippo","doi":"10.1109/MetroAeroSpace57412.2023.10189995","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10189995","url":null,"abstract":"The adaptability of QVAR to integrate with inertial sensors makes it useful as an auxiliary sensor for navigation. It can assist in navigation under challenging GPS conditions by utilizing Dead Reckoning based on airspeed estimates and inertial data. Additionally, QVAR can enhance the accuracy of air data sensors by utilizing cross-sensor queuing with air data sensors. The innovative technology of QVAR offers significant advantages for navigation compared to traditional Pitot tubes. It eliminates the need for airspeed estimation inlets and serves as a low-cost digital sensor. Moreover, QVAR can be easily tested on remotely piloted aircraft systems. Its minimal requirements in terms of mass, size, power consumption, and complexity make it a highly promising solution for airspeed sensing, especially on platforms with limited available resources like small unmanned aircraft. The following paper presents the development of a prototypal sensor, namely Qvar, produced by STMicroelectronics and based on MEMS technology. A digital output has been derived, and several laboratory tests have been conducted to find a correlation between this output and the speed of airflow, with the aim to exploit the developed sensor for estimating the airspeed of a drone.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129727565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of the accelerometer metrological characteristics on board the METRIC mission 米制任务上加速度计计量特性的测定
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10190021
A. Valmorbida, G. Anese, R. Peron, E. Lorenzini
{"title":"Determination of the accelerometer metrological characteristics on board the METRIC mission","authors":"A. Valmorbida, G. Anese, R. Peron, E. Lorenzini","doi":"10.1109/MetroAeroSpace57412.2023.10190021","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10190021","url":null,"abstract":"METRIC is a proposed mission that aims to improve the knowledge of atmospheric density, general relativity and geodesy. The mission foresees a small spherical satellite placed in a polar eccentric orbit, with the apogee at 1200 km of altitude and perigee at 400–450 km. The spacecraft will be tracked from ground and space and have an on-board 3-axis accelerometer. The accelerometer will measure non-gravitational accelerations (due mainly to neutral drag and solar radiation pressure). A dynamical simulator has been implemented with known models (e.g. higher-harmonics gravity field, upper atmosphere density, solar pressure) in order to estimate the non-gravitational accelerations acting on the satellite. These are then analyzed in order to extract their main characteristics: intensity and frequency spectrum. Consequently, an envelope for the accelerometer features - dynamic range, required accuracy and frequency bandwidth - can be set. The data collected by the accelerometer will be used, in combination with tracking data from GNSS and SLR, to improve the atmospheric density knowledge over a wide range of altitudes, to perform an accurate measurement of the orbital precessions predicted by general relativity and implement a space-based tie of geodetic reference frames.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130947583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Precision Angle Position Indicator Based on Virtual Instruments 基于虚拟仪器的精密角度位置指示器的研制
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10189938
You Li, Wang Shuqiang, Hu Zhiyuan, Liu Biye, Li Xiating, Wei Ran
{"title":"Development of Precision Angle Position Indicator Based on Virtual Instruments","authors":"You Li, Wang Shuqiang, Hu Zhiyuan, Liu Biye, Li Xiating, Wei Ran","doi":"10.1109/MetroAeroSpace57412.2023.10189938","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10189938","url":null,"abstract":"This paper presents a new precision angle position indicator (API) which is developed based on virtual PXI instruments, with frequency range from 47 Hz to 20 kHz, providing angle measurement resolution up to 0.0001 º and uncertainty of less than 0.001º (17 μrad) on single channel-mode. The efficacy of this technique surpasses those of commercially available API products, thereby adequately addressing the evaluation and assessment requirements within the aeronautical and aerospace industries, particularly in calibration of synchro and resolver simulators, and electrical specification testing of synchors or resolvers.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116387131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of Multi-level Structural Health Monitoring for Data Fusion in Real Scale Aerostructures 面向真实规模航空结构数据融合的多层次结构健康监测设计
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10189967
V. Memmolo, F. Romano, M. Ciminello, A. Sorrentino, E. Monaco, L. Maio, F. Ricci
{"title":"Design of Multi-level Structural Health Monitoring for Data Fusion in Real Scale Aerostructures","authors":"V. Memmolo, F. Romano, M. Ciminello, A. Sorrentino, E. Monaco, L. Maio, F. Ricci","doi":"10.1109/MetroAeroSpace57412.2023.10189967","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10189967","url":null,"abstract":"This paper present the application and challenges of a multi-sensory structural health monitoring-methodology on an industrial 5m long curved composite wing panel, for detecting barely visible impact damage based on integrated sensors data. Firstly, it presents a systematic design for a comprehensive structural health monitoring system for impact detection and related-damage characterization in complex aerostructures. The conceived approach relies on different technologies to offer multi-level diagnosis, including impact detection as well as damage identification, localization and sizing. The use of different excitation and sensing techniques (based on piezoelectric transducers, distributed fiber optic sensors and fiber Bragg gratings) deployed all over wing structures is explored towards continuous health management. The first design review carried out demonstrates the needs for multi-sensory information as well as the necessity of proper system to the fuse the information gathered from different sensors. Instead, the first experiments carried out independently at laboratory level showed promising results in detecting low-velocity impacts as well as characterizing barely visible damage occurring at structural level","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127219899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Local Correlation Degree of Laser Speckle for Vibration Analysis 激光散斑振动分析的局部相关度
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10190005
G. Spagnolo, F. Leccese
{"title":"Local Correlation Degree of Laser Speckle for Vibration Analysis","authors":"G. Spagnolo, F. Leccese","doi":"10.1109/MetroAeroSpace57412.2023.10190005","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10190005","url":null,"abstract":"Local correlation degree of laser speckle is advised for vibration analysis. If monochromatic light illuminates a rough surface, the radiation is scattered in a speckle pattern that depends on the light source and the geometry of the surface. Therefore, the study of the speckle pattern of a vibrating surface allows us to have information on the resonance frequencies and on the vibrational modes. In this paper, we propose a system, which is a variant of the DIC (Digital Image Correlation). Compared to DIC, it does not require that a speckled pattern to be “sprayed” on the sample. In our case, the speckle pattern is self-generated by illumination with coherent light. Our system can monitor the vibration modes of a surface brightened with laser light. By recording the speckle images, corresponding to the stationary state and when the surface is set in vibration, it is possible to reveal changes in the slant of the surface in real time. Therefore, one can individuate resonant frequencies and vibrational modes beacons. The planned system is cheap and user-friendly. Furthermore, it can also be used in operating conditions outside the laboratory. The work illustrates the technique and some experimental tests.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124417409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Heuristic Estimation of Temperature-Dependant Model Parameters of Li-Po Batteries for UAV Applications 无人机用锂电池温度相关模型参数的启发式估计
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10190045
A. Suti, G. Di Rito, Giuseppe Mattei
{"title":"Heuristic Estimation of Temperature-Dependant Model Parameters of Li-Po Batteries for UAV Applications","authors":"A. Suti, G. Di Rito, Giuseppe Mattei","doi":"10.1109/MetroAeroSpace57412.2023.10190045","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10190045","url":null,"abstract":"This work deals with the system identification of Thevenin models of Li-Po batteries for UAV applications. Starting from the results of an experimental hybrid pulse-power characterization of a battery pack carried out at different temperatures (0°C, 15°C, 49°C) and within the operative range of state-of-charge (>10%), the model parameters are identified via three heuristic optimization algorithms, based on particle-swarm, teaching-learning and differential evolution techniques. Differently from conventional approaches typically applied by commercial CAE tools (e.g. Matlab), the proposed techniques are directly applied to the whole time history of the measurements. The results highlight that the particle-swarm method exhibits the fastest convergence, but it requires to initially define the algorithm weighing coefficients. This is not needed for teaching-learning based optimization, but computational effort strongly increases to achieve satisfactory accuracy. The differential evolution technique provides intermediate performances, especially if the total computation time is also considered. The case study is referred to the 1850 mAh/6 cells/22.2 V Li-Po battery pack employed in the lightweight fixed-wing UAV Rapier X-25, developed by Sky Eye Systems (Italy).","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134310679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vibration Modal Assessment Using Acoustic Stimulation and Camera-Assisted Heterodyne Interferometry 基于声激励和相机辅助外差干涉测量的振动模态评估
2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace) Pub Date : 2023-06-19 DOI: 10.1109/MetroAeroSpace57412.2023.10189941
Wen Xiao, Zonghui Chen, Peng Deng, Xiyu Liu, Lu Xin, Yakun Liu, Xiaosu Yi, Feng Pan
{"title":"Vibration Modal Assessment Using Acoustic Stimulation and Camera-Assisted Heterodyne Interferometry","authors":"Wen Xiao, Zonghui Chen, Peng Deng, Xiyu Liu, Lu Xin, Yakun Liu, Xiaosu Yi, Feng Pan","doi":"10.1109/MetroAeroSpace57412.2023.10189941","DOIUrl":"https://doi.org/10.1109/MetroAeroSpace57412.2023.10189941","url":null,"abstract":"Modal vibration analysis is crucial in dynamic analysis and has been extensively employed for structural damage detection and health monitoring. This paper proposes a nondestructive approach utilizing camera-based heterodyne interferometry and acoustic excitation for modal analysis, aiming to accurately identify a structure's modal parameters. Using a high-speed complementary metal oxide semiconductor (CMOS) camera, full-field images of a vibrating structure with high-density spatial resolution can be quickly captured and analyzed to obtain sufficient vibration response data for modal analysis through heterodyne interferometry. In the experiment, a beam's vibration response under random white noise excitation is detected with heterodyne interferometry to extract natural frequencies. Mode shapes are derived from the full-field vibration response determined by heterodyne interferometry using an acoustic wave at natural frequencies. The findings display a considerable consistency with results from finite element analysis (FEA) and laser Doppler vibrometry (LDV), indicating that the proposed method serves as an effective technique for vibration modal analysis.","PeriodicalId":153093,"journal":{"name":"2023 IEEE 10th International Workshop on Metrology for AeroSpace (MetroAeroSpace)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122935415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信