Ultrasonics最新文献

{"title":"Spatial evolution of broadband Rayleigh waves indicative of material state","authors":"Seyed Hamidreza Afzalimir,&nbsp;Maryam Ghodousi,&nbsp;Cliff J. Lissenden","doi":"10.1016/j.ultras.2025.107640","DOIUrl":"10.1016/j.ultras.2025.107640","url":null,"abstract":"<div><div>Laser ultrasound is well suited to monitor metal additive manufacturing processes. Pulse laser-generated Rayleigh waveforms evolve with propagation distance due to material nonlinearity, making them a powerful tool for nondestructive evaluation, particularly for assessing microstructure. Unlike narrow-band Rayleigh waves, where the relative acoustic nonlinearity parameter is commonly used to evaluate material degradation, a pulse laser generates broadband unsymmetrical V-shaped waveforms whose spatial evolution we have characterized by a steepness parameter. Thermal aging precipitates multiple phases (including <span><math><msup><mrow><mi>γ</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> and <span><math><msup><mrow><mi>γ</mi></mrow><mrow><mo>′</mo><mo>′</mo></mrow></msup></math></span>) in Inconel718 samples that we documented by X-ray diffraction. These precipitates are associated with increased material nonlinearity. Comparing waveform spatial evolution, through changes in steepness, in samples before and after thermal aging revealed significant sensitivity to the material state. Thus, the technique has strong potential to provide unique insight into a material’s microstructure and the mechanical properties dictated by that microstructure.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107640"},"PeriodicalIF":3.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An improved D-S evidence fusion algorithm for sub-area collaborative guided wave damage monitoring of large-scale structures","authors":"Yuelin Du ,&nbsp;Hongmei Ning ,&nbsp;Yehai Li ,&nbsp;Qiao Bao ,&nbsp;Qiang Wang","doi":"10.1016/j.ultras.2025.107644","DOIUrl":"10.1016/j.ultras.2025.107644","url":null,"abstract":"<div><div>Due to the development of new materials and advanced manufacturing technologies, the application of large-scale composite structures has become increasingly widespread. Ensuring the safe and stable operation of such structures presents new challenges across various application domains. Addressing the limitations of existing guided wave structural health monitoring methods for online damage monitoring in large-scale structures, such as cumbersome equipment setup, insufficient signals coverage, and difficulties in processing massive data, a method for sub-area collaborative guided-wave-based structural damage monitoring and severity assessment based on sparse sensing is proposed. By employing a sparse sensing array layout, the structure is divided into multiple monitoring sub-areas with arranged sensing arrays to reduce overall complexity. The characteristic responses of the guided wave signals from different sub-areas are extracted to construct feature sub-spaces. Support vector machines are adopted to construct evaluation sub-networks in each feature sub-space, enabling regional monitoring. Additionally, an improved D-S evidence fusion algorithm is applied to fuse the decision-layer inputs from each evaluation sub-network, effectively utilizing the feature information from multiple sub-areas and enhancing the accuracy of damage severity assessment for large-scale structures. Experimental results on typical composite structure specimens demonstrate that by fusing the support vector machine evaluation results from each sub-area, the accuracy of damage severity assessment reaches 97.5%, with uncertainties in the severity assessment below 5%.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107644"},"PeriodicalIF":3.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasonic scattering in polycrystalline materials with elongated grains: A comparative 3D and 2D theoretical and numerical analysis","authors":"Juan Camilo Victoria-Giraldo ,&nbsp;Bing Tie ,&nbsp;Jérôme Laurent ,&nbsp;Alain Lhémery ,&nbsp;Denis Solas","doi":"10.1016/j.ultras.2025.107642","DOIUrl":"10.1016/j.ultras.2025.107642","url":null,"abstract":"<div><div>In this paper, a previously developed theoretical model for the ultrasonic elastic wave scattering, based on the Stanke and Kino model and applicable to both 2D and 3D single-phase untextured polycrystals, is extended to microstructures with elongated grains. The effect of elongated grains on wave attenuation and phase velocity induced by scattering is investigated, highlighting similarities and discrepancies between the 2D and 3D cases. Additionally, 2D and 3D finite element (FE) models are developed to compare and validate the theoretical predictions under fixed assumptions. The morphology of the numerical polycrystalline samples is characterized using a multi-exponential two-point correlation (TPC) function which, when incorporated with the theoretical model, enables a more direct and accurate comparison. The FE models demonstrate excellent quantitative agreement with the theoretical predictions and, moreover, support the wave propagation’s directional dependency in the stochastic scattering region and the 2D-3D dimensionality dissimilarities in the Rayleigh region. It is shown that 2D attenuation can predict 3D behavior in the stochastic limit and provide insights into the estimation of 3D grain morphology in the Rayleigh limit.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107642"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal principal component and measurement interval selection for PCA reconstruction-based anomaly detection in uncontrolled structural health monitoring.","authors":"Kang Yang, Kang Gao, Junkai Zhou, Chao Gao, Tingsong Xiao, Harsha Vardhan Tetali, Joel B Harley","doi":"10.1016/j.ultras.2025.107632","DOIUrl":"https://doi.org/10.1016/j.ultras.2025.107632","url":null,"abstract":"<p><p>PCA reconstruction-based techniques are widely used in guided wave structural health monitoring to facilitate unsupervised damage detection. The measurement interval of collecting evaluation data significantly influences the correlation among the data points, impacting principal component values and, consequently, the accuracy of damage detection. Despite its importance, there has been limited research on the selection of suitable components and measurement intervals to reduce false alarms. This paper seeks to develop strategies for identifying the optimal number of principal components and measurement intervals for PCA reconstruction-based damage detection methods. Our results indicate that the patterns of change in reconstruction coefficients, based on the number of components used in PCA reconstruction and the measurement interval for collecting evaluation data, are effective indicators for determining the optimal principal components and measurement intervals for damage detection, without using any damage information. The effectiveness of the indicators for determining optimal components and measurement intervals is validated using evaluation sets collected under uncontrolled and dynamic monitoring conditions, with measurement intervals ranging from 86 to 8600 s per measurement.</p>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":" ","pages":"107632"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143711174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the use of a Transformer Neural Network to deconvolve ultrasonic signals","authors":"T. Sendra,&nbsp;P. Belanger","doi":"10.1016/j.ultras.2025.107639","DOIUrl":"10.1016/j.ultras.2025.107639","url":null,"abstract":"<div><div>Pulse-echo ultrasonic techniques play a crucial role in assessing wall thickness deterioration in safety-critical industries. Current approaches face limitations with low signal-to-noise ratios, weak echoes, or vague echo patterns typical of heavily corroded profiles. This study proposes a novel combination of Convolution Neural Networks (CNN) and Transformer Neural Networks (TNN) to improve thickness gauging accuracy for complex geometries and echo patterns. Recognizing the strength of TNN in language processing and speech recognition, the proposed network comprises three modules: 1. pre-processing CNN, 2. a Transformer model and 3. a post-processing CNN. Two datasets, one being simulation-generated, and the other, experimentally gathered from a corroded carbon steel staircase specimen, support the training and testing processes. Results indicate that the proposed model outperforms other AI architectures and traditional methods, providing a 5.45% improvement over CNN architectures from NDE literature, a 1.81% improvement over ResNet-50, and a 17.5% improvement compared to conventional thresholding techniques in accurately detecting depths with a precision under 0.5<span><math><mi>λ</mi></math></span>.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107639"},"PeriodicalIF":3.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterising bulk-driven acoustic streaming in air","authors":"Christopher Stone,&nbsp;Mahdi Azarpeyvand,&nbsp;Anthony Croxford,&nbsp;Bruce Drinkwater","doi":"10.1016/j.ultras.2025.107638","DOIUrl":"10.1016/j.ultras.2025.107638","url":null,"abstract":"<div><div>Bulk-driven acoustic streaming flows induced by two different high-powered ultrasonic sources in air have been measured and characterised using particle image velocimetry (PIV). These time-averaged flows are driven by the attenuation of the acoustic energy, and appear as jets in the direction of the acoustic propagation. Langevin horns and a focussed array of transducers, which operate at acoustic frequencies of <span><math><mrow><mi>f</mi><mo>≈</mo><mn>27</mn></mrow></math></span> kHz and <span><math><mrow><mi>f</mi><mo>=</mo><mn>40</mn></mrow></math></span> kHz respectively, were used to create high pressure acoustic fields, with local sound pressure levels of over 160 dB. The magnitude of the acoustic streaming flows that resulted from the Langevin horn and the focussed array were up to <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>≈</mo><mn>0</mn><mo>.</mo><mn>15</mn><mspace></mspace><mi>m/s</mi></mrow></math></span> and <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>≈</mo><mn>0</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>m/s</mi></mrow></math></span> respectively. For a given peak acoustic pressure, the focussed array yielded higher acoustic streaming velocities due to the increased acoustic attenuation at the higher driving frequency. The shape of the acoustic field was found to govern the shape of the acoustic streaming velocity field, with the Langevin horn producing a wider jet with a more gradual velocity increase and decay than the focussed array. The focussed array induced a streaming velocity field where the maximum velocity occurred at a similar location to the peak acoustic pressure. Experimental PIV results were compared to a numerical model based on assumed weak non-linearity in which the attenuation of the first order pressure drives the streaming. The numerical model was able to predict the streaming velocity field with good qualitative and reasonable quantitative agreement.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107638"},"PeriodicalIF":3.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-resolution pressure imaging via background-oriented schlieren tomography: A spatiotemporal measurement for MHz ultrasound fields and hydrophone calibration","authors":"Sayaka Ichihara ,&nbsp;Masato Yamagishi ,&nbsp;Yuta Kurashina ,&nbsp;Masanori Ota ,&nbsp;Yoshiyuki Tagawa","doi":"10.1016/j.ultras.2025.107614","DOIUrl":"10.1016/j.ultras.2025.107614","url":null,"abstract":"<div><div>In this work, the spatiotemporal pressure field of MHz-focused ultrasound is measured using a background-oriented schlieren technique combined with fast checkerboard demodulation and vector tomography (VT-BOS). Hydrophones have been commonly employed to directly measure the local pressure in underwater ultrasound. However, their limitations include that they disturb the acoustic field and affect the measured pressure through the spatial averaging effect. To overcome such limitations, we propose VT-BOS as a non-contact technique for acoustic field measurements using only a background image and a camera. In our experiments, VT-BOS measures focused acoustic fields with a focal width of 1.0 mm and a frequency of 4.55 MHz, capturing traveling, reflected, and standing waves. We discuss three key features of this approach: (1) the temporal evolution of pressure measured by VT-BOS and hydrophones, (2) the differences in computational cost and spatial resolution between VT-BOS and other techniques, and (3) the measurement range of VT-BOS. The results demonstrate that VT-BOS successfully quantifies spatiotemporal acoustic fields and can estimate the hydrophones’ spatial averaging effect over a finite area. VT-BOS measures pressure fields of several MPa with high spatiotemporal resolution, requiring less computational and measurement time. It is used to measure pressure amplitudes from 0.4 to 6.4 MPa, with the potential to extend the range to 0.3–201.6 MPa by adjusting the background-to-target distance. VT-BOS is a promising tool for measuring acoustic pressure in the MHz and MPa ranges, critical for applications such as vessel flow measurement and hydrophone calibration.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107614"},"PeriodicalIF":3.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seepage and wetting evolution characteristics of coal fracture under the dual influence of ultrasonic stimulation and surfactant modification","authors":"Qiming Huang ,&nbsp;Bo Yu ,&nbsp;Cheng Zhai ,&nbsp;Gang Wang ,&nbsp;Haonan Shi ,&nbsp;Ting Liu ,&nbsp;Hao Xu ,&nbsp;Xu Wang ,&nbsp;Hongzhan Liu","doi":"10.1016/j.ultras.2025.107646","DOIUrl":"10.1016/j.ultras.2025.107646","url":null,"abstract":"<div><div>Coal seam water injection can effectively improve the water content of the coal seam and control the dust pollution in the mining process from the source. In this paper, we investigate the changes in internal fracture structure and water transport in coal samples by double treatment of surfactant and ultrasonic wave on anthracite samples. Ultrasonic treatment of coal samples immersed in water and observation of the difference in wetting characteristics before and after treatment. The results demonstrate that the primary fracture in the coal samples expands within 4–5 h of ultrasonic stimulation, a new fracture with an opening between 10 and 15 µm is generated during the stimulation process and the permeability of the coal samples increases by four to eight times compared with the untreated one. It is worth noting that water can fully penetrate the newly formed fracture during the ultrasonic intervals. Ultrasound can make surfactants dissolve better, but the thermal and cavitation effects of ultrasound can also inhibit the effect of surfactants in promoting water absorption in coal. The results guide future research and development of ultrasonic-enhanced water injection technology in coal seams.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107646"},"PeriodicalIF":3.8,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complex amplitude encoding metalens realizing arbitrary ultrasonic needle beams","authors":"Yu-Hang Lv ,&nbsp;Xing Chen ,&nbsp;Jie Yao ,&nbsp;Xing-Feng Zhu ,&nbsp;Da-Jian Wu","doi":"10.1016/j.ultras.2025.107645","DOIUrl":"10.1016/j.ultras.2025.107645","url":null,"abstract":"<div><div>Extending the depth of focus is necessary in many scenarios. Recent progress in ultrasonic applications demands various kinds of foci and poses challenges to science and technologies. Here, we propose to connect individual foci forming an ultrasonic needle beam (UNB) through complex amplitude encoding with super-units. Two phase distributions are encoded into one metalens through super-units, which realizes a complex-amplitude modulation and achieve multifocal points in space. The performance of the metalens can be improved by adjusting the parameters of super-units. Both simulations and experiments have demonstrated that the metalens designed through the proposed method can efficiently produce single or twin UNBs. Our work has potential applications in biomedical treatment and imaging, remote communication, and nondestructive detection.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107645"},"PeriodicalIF":3.8,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An ultra-thin MXene film with high conversion efficiency for broadband ultrasonic photoacoustic transducer","authors":"Wenqi Zhang ,&nbsp;Ruolan Yang ,&nbsp;Lai Wei ,&nbsp;Jinxu Wei ,&nbsp;Xiangying Meng ,&nbsp;Hanyue Ma ,&nbsp;Yujia Pang ,&nbsp;Yuanyuan Li ,&nbsp;Hui Xia ,&nbsp;Songmei Wu","doi":"10.1016/j.ultras.2025.107633","DOIUrl":"10.1016/j.ultras.2025.107633","url":null,"abstract":"<div><div>High-pressure, broadband, and miniatured ultrasound emitters are urgently needed in biomedical imaging and treatment as well as non-destructive detection. In this work, we report a laser generated ultrasonic photoacoustic transducer (LGUPT) based on an ultra-thin layer of MXene (Ti<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>C<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>T<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span>) nanosheets. Under the excitation of <span><math><mrow><mn>532</mn><mspace></mspace><mi>nm</mi></mrow></math></span> nanosecond laser pulses, the amplitude of the generated sound pressure can reach <span><math><mrow><mn>8</mn><mo>.</mo><mn>7</mn><mspace></mspace><mi>MPa</mi></mrow></math></span>, with a bandwidth of <span><math><mrow><mn>17</mn><mo>.</mo><mn>4</mn><mspace></mspace><mi>MHz</mi></mrow></math></span> at the irradiation intensity of <span><math><mrow><mn>17</mn><mo>.</mo><mn>72</mn><mspace></mspace><mi>mJ</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>. The photoacoustic conversion efficiency of the <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>-thick MXene film/PDMS transducer was found to be <span><math><mrow><mn>1</mn><mo>.</mo><mn>21</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>, which is among the highest values reported to date. The MXene thin film can also be drop-casted on the curved surface of a focusing lens. The amplitude of the sound pressure signal can reach 25.3 <span><math><mi>MPa</mi></math></span> and the bandwidth <span><math><mrow><mn>19</mn><mo>.</mo><mn>7</mn><mspace></mspace><mi>MHz</mi></mrow></math></span> at a pulse laser energy of <span><math><mrow><mn>28</mn><mo>.</mo><mn>12</mn><mspace></mspace><mi>mJ</mi><mo>/</mo><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span>. The width of the focal spot at −3 dB of maximum amplitude was found in the range of <span><math><mrow><mi>0.14</mi><mspace></mspace><mi>mm</mi></mrow></math></span> for the optical lens based LGUPT under the condition of a laser spot diameter of <span><math><mrow><mi>15</mi><mspace></mspace><mi>mm</mi></mrow></math></span> by theoretical simulation. The water processable focusing LGUPT demonstrated excellent ultrasonic cavitation effect on the tissue mimicking agar plate. Our experimental and theoretical work highlights the potential of ultra-thin MXene film based LGUPTs for high precision photoacoustic therapy, integrated imaging and sensing instruments.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"152 ","pages":"Article 107633"},"PeriodicalIF":3.8,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143674568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}