Optics and Laser Technology最新文献

{"title":"Beam quality M2(ψ) factor, spot rotation angle, and angular speed of general laser beams","authors":"Zhen-Xiang Hao ,&nbsp;Ruo-Xi Wu ,&nbsp;Hong-Bo Jin ,&nbsp;Ya-Zheng Tao ,&nbsp;Yue-Liang Wu","doi":"10.1016/j.optlastec.2025.113572","DOIUrl":"10.1016/j.optlastec.2025.113572","url":null,"abstract":"<div><div>A unified definition for the rotation angle and rotation angular speed of general beams, including those with orbital angular momentum (OAM), has been lacking until now. In this paper, we characterize the rotation of a general beam by observing the rotational behavior of the directions of the extreme spot sizes during propagation. Moreover, we introduce the beam quality <span><math><msup><mi>M</mi><mn>2</mn></msup><mo>(</mo><mi>ψ</mi><mo>)</mo></math></span> factor to characterize the unique beam quality of a general beam across all directions, not limited to the <span><math><mi>x</mi></math></span>- or <span><math><mi>y</mi></math></span>-axes. Besides that, we present the beam center <span><math><msub><mi>s</mi><mrow><mi>ψ</mi></mrow></msub><mo>(</mo><mi>ψ</mi><mo>,</mo><mi>z</mi><mo>)</mo></math></span>, spot size <span><math><msub><mi>w</mi><mrow><mi>ψ</mi></mrow></msub><mo>(</mo><mi>ψ</mi><mo>,</mo><mi>z</mi><mo>)</mo></math></span>, waist position, waist radius, and divergence angle along the direction that forms an angle <span><math><mi>ψ</mi></math></span> with the <span><math><mi>x</mi></math></span>-axis in the plane perpendicular to the <span><math><mi>z</mi></math></span>-axis. Furthermore, this paper presents rapid calculation formulas for these parameters, utilizing the mode expansion method. By integrating the advanced fast mode decomposition techniques with the rapid calculation formulas derived in this paper, we can significantly enhance the real-time beam evaluation methods, thereby enabling the instantaneous acquisition of these beam properties. Subsequently, we demonstrate that four angular solutions for extreme spot sizes exist in a given detection plane, coalescing into two physically distinct states through <span><math><msup><mn>180</mn><mrow><mo>∘</mo></mrow></msup></math></span> rotational symmetry: one corresponding to the maximum spot size(maximum spot rotation angle)and the other to the minimum (minimum spot rotation angle). The angular separation between the maximum and minimum spot rotation angles is consistently <span><math><msup><mn>90</mn><mrow><mo>∘</mo></mrow></msup></math></span> during the propagation. We also prove the spot rotation angles converge as <span><math><mi>z</mi></math></span> approaches positive or negative infinity. We first show the extreme spot sizes, spot rotation angle, and angular speed for the vortex beam. Our formulas efficiently differentiate between vortex OAM beams and asymmetry OAM beams.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113572"},"PeriodicalIF":4.6,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663283","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":"Metasurface-enabled diffractive neural networks for multi-label classification","authors":"Zhongliang Li ,&nbsp;Shuai Zhou ,&nbsp;Di Wang ,&nbsp;He Ren ,&nbsp;Zhao Li ,&nbsp;Zhigang Fan ,&nbsp;Yuxiang Feng ,&nbsp;Shouqian Chen","doi":"10.1016/j.optlastec.2025.113594","DOIUrl":"10.1016/j.optlastec.2025.113594","url":null,"abstract":"<div><div>Optical neural networks have attracted considerable attention due to their capability to facilitate high-speed and low-power neuromorphic computation at the physical level. Diffractive neural networks represent a class of optical neural network architectures that are based on the Huygens-Fresnel principle. This paper presents a diffractive neural network based on silicon-based dielectric metasurfaces. A multi-label classification task, which improves classification efficiency and increases the ability of computation compared to traditional handwritten digit classification tasks, is proposed as a means of training this neural network and exploring its classification capabilities. The proposed approach offers a new way for the application of diffractive neural networks in the domain of target classification and recognition.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113594"},"PeriodicalIF":4.6,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663281","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":"BICFusion: An unsupervised infrared and visible image fusion framework for beyond illumination constraints","authors":"Jinye Peng ,&nbsp;Yu Chen ,&nbsp;Shenglin Peng ,&nbsp;Zhaoke Liu ,&nbsp;Jie Chen ,&nbsp;Shuyi Qu ,&nbsp;Jun Wang","doi":"10.1016/j.optlastec.2025.113554","DOIUrl":"10.1016/j.optlastec.2025.113554","url":null,"abstract":"<div><div>Infrared and visible image fusion is aimed at merging features from both modalities in order to produce a more information-rich fused image. However, the majority of existing methods have overlooked the specific requirements and challenges inherent in fusion tasks under low-light conditions. In such scenes, texture degradation due to poor illumination is common, and furthermore, local overexposure may result in significant information loss. To tackle these challenges, a novel framework named BICFusion is introduced, which addresses these issues through reflectance separation, cross-modal feature compensation, and dual enhancement of texture and contrast. The Retinex theory is employed to design a network that extracts reflectance representing the intrinsic structure and details of the scene from the visible image, thereby providing the fusion result with rich structural information under minimal illumination constraints. The cross-modal feature guidance weighting module (CFGW) is developed to compensate for missing details by leveraging the infrared image when the visible image lacks sufficient texture information due to adverse lighting conditions such as low light or overexposure. Subsequently, the texture enhancement fusion module (TEFM) and the global-local contrast enhancement loss function are proposed to jointly enhance the fusion quality in terms of texture and contrast. Experiments conducted with twelve state-of-the-art methods on three publicly available datasets validate the superior performance of BICFusion in preserving fine details under low-light and overexposed conditions.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113554"},"PeriodicalIF":4.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655966","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":"Magnetic-field-assisted laser cladding of SDSS 2507 on SS 420: An experimental investigation and multi-objective optimization","authors":"Indranil Mandal,&nbsp;Vidyapati Kumar,&nbsp;Partha Saha","doi":"10.1016/j.optlastec.2025.113603","DOIUrl":"10.1016/j.optlastec.2025.113603","url":null,"abstract":"<div><div>Achieving high hardness in laser-clad layers remains crucial for surface engineering. The present study compares four multi-objective algorithms—Multi-objective Bonobo Optimizer (MOBO), Multi-objective Dragonfly Algorithm (MODA), Multi-objective Particle Swarm Optimization (MOPSO), and Non-dominated Sorting Genetic Algorithm II (NSGA-II) to optimize processing parameters during single-track laser cladding of Super Duplex Stainless Steel (SDSS) 2507 on SS 420, with/without a steady magnetic field (MF). Magnetostrictive effects were examined to enhance microhardness and reduce thermal stress. The researchers did not investigate such a study earlier. Geometrical features, microstructure, XRD and EDS analysis, microhardness, and thermal stress of the clad layer were evaluated. The comparative analysis indicated that MOBO was the most effective algorithm for this specific optimization challenge, offering the most consistent and accurate approximation of the true Pareto front. Multi-criteria decision-making (MCDM) methods were employed to select the most appropriate solution from the Pareto set generated by MOBO. The optimum processing parameters were 973 W of laser power, 400 mm/min of scanning speed, and 3 mT of magnetic field strength. Experimental validation results were in perfect conformity with the model. The coatings are in acceptable condition, with an average microhardness of 432.25 HV_0.05 and a dilution of 0.49. The maximum average error among experimental validation and model predictions for dilution and microhardness was 4.08 % and 0.59 %, respectively. MF-assisted cladding refined microstructure, enhancing microhardness, minimizing dilution/thermal stress, and preventing plastic deformation. This approach improves dimensional accuracy in SS420 injection moulding dies by reducing surface wear during repetitive contact with mould materials.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113603"},"PeriodicalIF":4.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655850","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":"Optimisation of laser parameters for fabrication of microchannels on PMMA using Kr-F pulsed laser","authors":"D. Deepak Singh ,&nbsp;M. Shanmuka Srinivas ,&nbsp;S. Purushothaman ,&nbsp;M. Ravi Sankar ,&nbsp;Nagahanumaiah","doi":"10.1016/j.optlastec.2025.113575","DOIUrl":"10.1016/j.optlastec.2025.113575","url":null,"abstract":"<div><div>Microchannels are most widely used in point of care (PoC) devices and microfluidic systems for medical and diagnostic applications. Fabrication of microchannels by traditional techniques has always been challenging. The current research is focused on fabricating them on polymers such as polymethylmethacrylate (PMMA) for their bio-compatibility and other added advantages using laser. Kr-F pulsed laser of 248 nm wavelength has been used for this study, and the effects of laser parameters on the geometry of microchannels machined on PMMA are reported. Parameters such as channel width, channel depth, roughness, and wall angle are measured, in order to study the effects of laser parameters and optimise them with the objective to achieve desirable microchannel characteristics such as smooth surfaces, uniform depth, and square channels. A response surface methodology (RSM) based experimental design was used to optimise the laser parameters. Laser energy at 310 mJ, with scan speed of 10 mm/min, and frequency of 32 Hz has provided with the channels of desired quality.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113575"},"PeriodicalIF":4.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655964","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":"Laser peening induced stress forming and dislocation evolution of the integral stiffened plate: fatigue crack growth behavior under three-point bending cyclic loading","authors":"Gaoqiang Jiang ,&nbsp;Li Li ,&nbsp;Ying Chen ,&nbsp;Lei Huang ,&nbsp;Xiankai Meng ,&nbsp;Shu Huang ,&nbsp;Jianzhong Zhou","doi":"10.1016/j.optlastec.2025.113584","DOIUrl":"10.1016/j.optlastec.2025.113584","url":null,"abstract":"<div><div>A comprehensive process of forming manufacturing and fatigue performance enhancement by laser peening (LP/LPF) was proposed for integral skin structure. The forming law for integral stiffened plate was explored, and the dislocation features of typical positions after LPF was characterized. The inhibition mechanism of crack propagation by grain refinement, dislocation evolution, and compressive residual stress (CRS) implantation in typical positions induced by LP and deformation was analyzed. The fatigue crack growth behavior and fatigue life extension mechanism under three-point bending cyclic loading mode were revealed. Results revealed that the stiffener decrease the bending curvature by 17.3 times. LP causes a fine-grained layer containing high-density dislocations, accompanied by increased and coarsened second phase. The dislocation density and second phase precipitation in the compressed region only affected by CRS decrease, and many subgrains appear. Under three-point bending cyclic loading mode, the fatigue life of LPFed samples increase by 8.6, 10.6, and 11.3 times. The compressed stiffener perpendicular to crack increase the distance and area to inhibit propagation, and overlapping spots induced rough surface “guides” the deviated crack return. High-density dislocations and compressed fine grain layers implanted by LP and deformation have dislocation strengthening, fine grain strengthening, and compression toughening effects.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113584"},"PeriodicalIF":4.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655962","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":"5-kW narrow-linewidth single-mode fiber laser based on homemade ultra-low absorption LMA-30/400 Yb-doped fiber","authors":"Kun Peng ,&nbsp;Shaohua Feng ,&nbsp;Yuanan Li ,&nbsp;Li Ni ,&nbsp;Juan Yu ,&nbsp;Heng Xiang ,&nbsp;Xiaoxiao Leng ,&nbsp;Aoxiang Lin","doi":"10.1016/j.optlastec.2025.113583","DOIUrl":"10.1016/j.optlastec.2025.113583","url":null,"abstract":"<div><div>Improving the nonlinear effect thresholds and performance of fiber laser systems becomes essential for developing high-power narrow-linewidth fiber lasers. We have designed and fabricated the novel LMA-30/400 Yb-doped fiber with an ultra-low cladding absorption of 0.22 dB/m@915 nm and a core <em>NA</em> of 0.065. Investigating the influence of bending diameter on cladding absorption indicates that enlarging the bending diameter can effectively reduce cladding absorption. A narrow-linewidth laser with a maximum output power of 5020 W has been achieved based on white-noise phase modulation under non-stabilized 976 nm LD pumping, where the spectral linewidth Δλ_3dB of 0.135 nm, the slope efficiency of 81.4 % and the beam quality of <em>M²</em> of ∼1.21. Importantly, no Transverse Mode Instability (TMI) was observed even at the 5-kW level. This work provides valuable insights for the future development of ultra narrow-linewidth lasers with high power and high beam quality.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113583"},"PeriodicalIF":4.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655965","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":"Chiral long-period fiber grating based conjugate vortex beam interference for nano-displacement measurement","authors":"Kaili Ren ,&nbsp;Haiyan Zhang ,&nbsp;Aochi Jia ,&nbsp;Menghao Li ,&nbsp;Jiahao Ma ,&nbsp;Dongdong Han ,&nbsp;Jun Dong ,&nbsp;Yipeng Zheng ,&nbsp;Chengliang Zhu","doi":"10.1016/j.optlastec.2025.113601","DOIUrl":"10.1016/j.optlastec.2025.113601","url":null,"abstract":"<div><div>A novel nano-displacement measurement system is proposed, which distinctively exploits the interference of conjugated vortex beams generated by a chiral long-period fiber grating (CLPG). The orbital angular momentum vortex beam generator in this system features a simple structure, enabling both flexible design and high-precision guarantee. Additionally, a modified Mach Zehnder interferometer is used for nano-displacement measurement, accompanied by the development of an optimized centroid rotation demodulation method. By combining image preprocessing with a Gaussian weighting approach, the proposed method effectively mitigates errors arising from petal-shaped interference pattern modulation, significantly improving demodulation accuracy and stability. As a result, the optimized centroid rotation demodulation method effectively reduces the errors caused by petal-shaped interference pattern modulation. Both theoretical analysis and experimental results demonstrate extremely high accuracy and good agreement. The displacement measurement sensitivity in the experiment is above 0.23358°/nm when the displacement ranges from 1 nm to 100 nm with a perfect linearity of 0.99997. Given its simple structure, strong robustness and excellent measurement accuracy, this displacement measurement system, which capitalizes on the vortex beam generated by CLPG, is poised to play a crucial role and exert profound impacts in a variety of high-precision fields, such as micro/nano manufacturing, micro vibration monitoring, and biomedical measurement, etc.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113601"},"PeriodicalIF":4.6,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655967","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":"RetinexD-Net: A retinex-densenet fusion architecture for low-light image enhancement in drill pipe detection","authors":"Zhongsen Zhang ,&nbsp;Xiaofan Liu ,&nbsp;Dezheng Hua ,&nbsp;Xiaoqiang Guo ,&nbsp;Tichun Wang ,&nbsp;Xinhua Liu","doi":"10.1016/j.optlastec.2025.113547","DOIUrl":"10.1016/j.optlastec.2025.113547","url":null,"abstract":"<div><div>Visual detection of drill pipes is crucial for the effective operation of coal mine drilling robots. However, insufficient underground lighting often results in images with low brightness, limited detail, and reduced color fidelity, similar to challenges in natural low-light vision applications. To address this, a low-light image enhancement method based on Retinex and an improved DenseNet is proposed, which effectively leverages DenseNet’s dense connectivity and brightness distribution characteristics to enhance image quality. The model comprises four main components: (1) A decomposition network that separates low-light images into illumination and reflectance components; (2) An illumination enhancement network for processing the illumination component; (3) A reflectance adjustment network for refining the reflectance component; and (4) A perceptually-consistent fusion network that combines the enhanced components to produce the final output. Experimental results demonstrate superior PSNR, SSIM, and LPIPS scores compared to state-of-the-art methods. The enhanced images improve drill pipe detection rates by 39.2% and 24.4% under distinct experimental conditions, offering novel approaches for image processing in underground coal mine environments and natural low-light scenes.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113547"},"PeriodicalIF":4.6,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655959","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":"Comparative analysis of the emission properties of polar GaN/AlN and AlGaN/AlN multi-quantum wells","authors":"Kamil Koronski ,&nbsp;Konrad Sakowski ,&nbsp;Paweł Strak ,&nbsp;Krzysztof P. Korona ,&nbsp;Aleksandra Wierzbicka ,&nbsp;Serhii Kryvyi ,&nbsp;Kamil Sobczak ,&nbsp;Rafal Jakiela ,&nbsp;Eva Monroy ,&nbsp;Stanislaw Krukowski ,&nbsp;Agata Kaminska","doi":"10.1016/j.optlastec.2025.113568","DOIUrl":"10.1016/j.optlastec.2025.113568","url":null,"abstract":"<div><div>The emission properties of GaN/AlN and Al_0.08Ga_0.92N/AlN polar multi-quantum wells (MQWs) have been investigated by photoluminescence (PL) and time-resolved PL (TRPL) measurements as a function of temperature and pressure. The results were correlated with <em>ab initio</em> calculations. The samples were grown by plasma-assisted molecular-beam epitaxy. Their structural/chemical features were characterised by X-ray diffraction (XRD), scanning transmission electron microscopy (STEM), and secondary ion mass spectrometry (SIMS). The well/barrier equal widths in the series of samples varied from 1.5 to 5 nm for GaN/AlN and from 2 to 4 nm for AlGaN/AlN MQWs, respectively. Due to the strong internal electric fields, both types of MQWs revealed some similarities in their optical properties: a redshift of the PL with increasing well width, a strong increase of the PL decay times, and a decrease of the pressure coefficients for wider wells. However, some differences were also observed: the emission energies of AlGaN/AlN structures were higher due to the presence of aluminium in the wells, activation energies were lower due to lower band offset, and internal quantum efficiencies and pressure coefficients were higher because of smaller lattice mismatch in AlGaN/AlN (weaker piezoelectric effects). The PL energies, oscillator strengths, and PL pressure dependencies were determined by density functional theory calculations, obtaining reasonable agreement with experimental measurements. Our analysis demonstrated a significant influence of piezoelectric effects on the emission properties of nitride-based QWs, and revealed that nonlinear processes are more important in the AlGaN/AlN system than in GaN/AlN, pointing to the presence of an additional mechanism of optical emission in AlGaN alloys.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"192 ","pages":"Article 113568"},"PeriodicalIF":4.6,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655960","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}