Chong Song, Liang Zhou, Zhaohui Liu, Kai Jiang, Kai Liu
A calculation model to obtain the optimal combination of Offner–Wynne imaging spectrometer parameters to balance the RMS spot radius of the chief ray over the entire field is established. On the basis of the calculation model, an Offner–Wynne imaging spectrometer is designed, and then it is applied in a short-wave infrared coded aperture snapshot spectral imager (CASSI). The optical system of the short-wave infrared CASSI is designed by a combination method of independent design and integrated optimization. The spectral smile and spectral keystone of the optical system which operates in the 900–1700 nm band are respectively less than half a pixel. The focal length of the optical system is 1200 mm, the total optical system length is 775 mm, and its average spectral resolution is 16 nm. The optical system offers the advantages of excellent imaging quality, compact optical structure, high optical transmittance, reduced spectral smile and spectral keystone.
{"title":"Optical design of a short-wave infrared coded aperture snapshot spectral imager based on Offner–Wynne imaging spectrometer","authors":"Chong Song, Liang Zhou, Zhaohui Liu, Kai Jiang, Kai Liu","doi":"10.37190/oa220201","DOIUrl":"https://doi.org/10.37190/oa220201","url":null,"abstract":"A calculation model to obtain the optimal combination of Offner–Wynne imaging spectrometer parameters to balance the RMS spot radius of the chief ray over the entire field is established. On the basis of the calculation model, an Offner–Wynne imaging spectrometer is designed, and then it is applied in a short-wave infrared coded aperture snapshot spectral imager (CASSI). The optical system of the short-wave infrared CASSI is designed by a combination method of independent design and integrated optimization. The spectral smile and spectral keystone of the optical system which operates in the 900–1700 nm band are respectively less than half a pixel. The focal length of the optical system is 1200 mm, the total optical system length is 775 mm, and its average spectral resolution is 16 nm. The optical system offers the advantages of excellent imaging quality, compact optical structure, high optical transmittance, reduced spectral smile and spectral keystone.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70014661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
A novel mid-infrared polarization beam splitter (PBS) based on GaS is proposed. The high birefringence is achieved by using the cladding structure of alternating arrangement of square and circular air holes as well as introducing double elliptical air holes. The finite element method (FEM) is utilized to investigate the mode coupling characteristics in the proposed PBS. The results show that the highest extinction ratio of 115 dB and shortest length of only 40 μm can be realized at a wavelength of 4 μm. A wide bandwidth of 200 nm ranging from 3.9 to 4.1 μm is obtained.
{"title":"Mid-infrared polarization beam splitter based on square/circular hybrid air holes with wide bandwidth and ultrashort length","authors":"Guang-Ming Zheng","doi":"10.37190/oa220302","DOIUrl":"https://doi.org/10.37190/oa220302","url":null,"abstract":"A novel mid-infrared polarization beam splitter (PBS) based on GaS is proposed. The high birefringence is achieved by using the cladding structure of alternating arrangement of square and circular air holes as well as introducing double elliptical air holes. The finite element method (FEM) is utilized to investigate the mode coupling characteristics in the proposed PBS. The results show that the highest extinction ratio of 115 dB and shortest length of only 40 μm can be realized at a wavelength of 4 μm. A wide bandwidth of 200 nm ranging from 3.9 to 4.1 μm is obtained.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70015289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
S. Anjana, Pankaj Rakheja, Akash Yadav, Phool Singh, H. Singh
A novel asymmetric scheme for double image encryption, compression and watermarking based on QR decomposition in the Fresnel domain has been presented. The QR decomposition provides a permutation matrix as a ciphertext and the product of orthogonal and triangular matrix as a key. The ciphertext obtained through this process is a sparse matrix that is compressed by the CSR method to give compressed encrypted data, which, when combined with a host image, gives a watermarked image. Thus, a cryptosystem that involves compression and watermarking is proposed. The proposed scheme is validated for grayscale images. To check the efficacy of the proposed scheme, histograms, statistical parameters, and key sensitivity are analyzed. The scheme is also tested against various attacks. Numerical simulations are performed to validate the security of the scheme.
{"title":"Asymmetric double image encryption, compression and watermarking scheme based on orthogonal-triangular decomposition with column pivoting","authors":"S. Anjana, Pankaj Rakheja, Akash Yadav, Phool Singh, H. Singh","doi":"10.37190/oa220210","DOIUrl":"https://doi.org/10.37190/oa220210","url":null,"abstract":"A novel asymmetric scheme for double image encryption, compression and watermarking based on QR decomposition in the Fresnel domain has been presented. The QR decomposition provides a permutation matrix as a ciphertext and the product of orthogonal and triangular matrix as a key. The ciphertext obtained through this process is a sparse matrix that is compressed by the CSR method to give compressed encrypted data, which, when combined with a host image, gives a watermarked image. Thus, a cryptosystem that involves compression and watermarking is proposed. The proposed scheme is validated for grayscale images. To check the efficacy of the proposed scheme, histograms, statistical parameters, and key sensitivity are analyzed. The scheme is also tested against various attacks. Numerical simulations are performed to validate the security of the scheme.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70015712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
P. Filio-Aguilar, L. López-García, J. Rueda-Paz, M. Ávila-Aoki
One of the most important sources of errors in digital fringe projection (DFP) systems is the nonlinearity in the response of the projector when it uses the three-step phase retrieval algorithm. Thus, it is necessary to increase the accuracy without affecting the efficiency. In this sense, the radiometric rectification methods are used. In this paper, an active radiometric rectification method for digital fringe projection is proposed. This proposal consists in two improvements of traditional active techniques: first, parallel intensity projection is used to obtain the projector response which requires only four dot patterns; and second, a method is provided for the calculation of the inverse polynomial that guarantees symmetry with respect to the response of the projector. Experimental results, in a digital fringe projection system, show that the root-mean-square phase error improves 6.3 times using this proposal.
{"title":"Simultaneous intensity projection for projector response computation with application to an active radiometric calibration","authors":"P. Filio-Aguilar, L. López-García, J. Rueda-Paz, M. Ávila-Aoki","doi":"10.37190/oa220404","DOIUrl":"https://doi.org/10.37190/oa220404","url":null,"abstract":"One of the most important sources of errors in digital fringe projection (DFP) systems is the nonlinearity in the response of the projector when it uses the three-step phase retrieval algorithm. Thus, it is necessary to increase the accuracy without affecting the efficiency. In this sense, the radiometric rectification methods are used. In this paper, an active radiometric rectification method for digital fringe projection is proposed. This proposal consists in two improvements of traditional active techniques: first, parallel intensity projection is used to obtain the projector response which requires only four dot patterns; and second, a method is provided for the calculation of the inverse polynomial that guarantees symmetry with respect to the response of the projector. Experimental results, in a digital fringe projection system, show that the root-mean-square phase error improves 6.3 times using this proposal.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70017288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
We demonstrate a modified hexagonal three-layer air-hole photonic crystal fiber (PCF) which presents a good ability of dispersion management. The proposed PCF not only achieved an ultra-flattened all-negative dispersion characteristics of 0.15085 ps/(km·nm) fluctuation within the wavelength range of E+S+C+L wavelength band but also has been able to obtain other interesting features such as low confinement loss. Furthermore, the quadrilateral and octagonal structures are investigated to compare the superiority of different structures and analyze why we chose the hexagonal one.
{"title":"Fully negative near-zero ultra-flat dispersion photonic crystal fibers in E+S+C+L band","authors":"Yucheng Mao, Yiwu Ma, Ying Huang, Hua Yang","doi":"10.37190/oa220410","DOIUrl":"https://doi.org/10.37190/oa220410","url":null,"abstract":"We demonstrate a modified hexagonal three-layer air-hole photonic crystal fiber (PCF) which presents a good ability of dispersion management. The proposed PCF not only achieved an ultra-flattened all-negative dispersion characteristics of 0.15085 ps/(km·nm) fluctuation within the wavelength range of E+S+C+L wavelength band but also has been able to obtain other interesting features such as low confinement loss. Furthermore, the quadrilateral and octagonal structures are investigated to compare the superiority of different structures and analyze why we chose the hexagonal one.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70017475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
In this study, a submicron-particles-arrayed optical storage disk was fabricated by the spin coating method. Moreover, we have formed a multi-valued pit by irradiating linearly polarized laser beams at multiple angles (0° and 90°). The optical setup has the semiconductor laser (λ = 637 nm) for reconstructing and the SHG-YVO4 laser (λ = 532 nm) for recording. The optical setup measured the submicron-particles-arrayed optical storage as a confocal image by 2D scanning with a motorized stage.
{"title":"Polarization multiplexed bit data recording to submicron-particles-arrayed optical storage","authors":"Daiki Okuzono, C. Egami","doi":"10.37190/oa220105","DOIUrl":"https://doi.org/10.37190/oa220105","url":null,"abstract":"In this study, a submicron-particles-arrayed optical storage disk was fabricated by the spin coating method. Moreover, we have formed a multi-valued pit by irradiating linearly polarized laser beams at multiple angles (0° and 90°). The optical setup has the semiconductor laser (λ = 637 nm) for reconstructing and the SHG-YVO4 laser (λ = 532 nm) for recording. The optical setup measured the submicron-particles-arrayed optical storage as a confocal image by 2D scanning with a motorized stage.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70014323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Xiaoqing Xu, Ming Xie, Song Chen, Ying Ji, Yawei Wang
The interferogram containing the noises often affects the accuracy of phase retrieval, leading to the degradation of the phase imaging quality. To address this issue, a new interferogram blind denoising (IBD) method based on deep residual learning is proposed. In the presence of unknown noise levels, during the training, the deep residual convolutional neural networks (DRCNN) in the IBD approach is able to remove the latent clean interferogram implicitly, and then gradually establish the residual mapping relation in the pixel-level between the interferogram and the noises. With a well-trained DRCNN model, this algorithm can deal not only with the single-frame interferogram efficiently but also with the multi-frame phase-shifted interferograms collaboratively, while effectively retaining interferogram features related to phase retrieval. Simulation and experimental results demonstrate the feasibility and applicability of the proposed IBD method.
{"title":"Interferogram blind denoising using deep residual learning for phase-shifting interferometry","authors":"Xiaoqing Xu, Ming Xie, Song Chen, Ying Ji, Yawei Wang","doi":"10.37190/oa220108","DOIUrl":"https://doi.org/10.37190/oa220108","url":null,"abstract":"The interferogram containing the noises often affects the accuracy of phase retrieval, leading to the degradation of the phase imaging quality. To address this issue, a new interferogram blind denoising (IBD) method based on deep residual learning is proposed. In the presence of unknown noise levels, during the training, the deep residual convolutional neural networks (DRCNN) in the IBD approach is able to remove the latent clean interferogram implicitly, and then gradually establish the residual mapping relation in the pixel-level between the interferogram and the noises. With a well-trained DRCNN model, this algorithm can deal not only with the single-frame interferogram efficiently but also with the multi-frame phase-shifted interferograms collaboratively, while effectively retaining interferogram features related to phase retrieval. Simulation and experimental results demonstrate the feasibility and applicability of the proposed IBD method.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70014418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
To escalate the image encryption a new method has been devised which includes double random phase encoding (DRPE) using rear phase masking and random decomposition (RD) technique stranded on fractional Fourier transform. Here, asymmetric cryptographic system is developed in fractional Fourier transform (FrFT) mode using two random phase masks (RPM) and a rear mounted phase mask. In the projected scheme a colored image is decomposed into R, G and B channels. The amplitude of each channel is normalized, phase encoded and modulated using RPM. The modulated R, G and B channels of the colored image are individually transformed using FrFT to produce corresponding encrypted image. The proposed scheme is authorized on grayscale image also. The norm behind the development of the suggested scheme has been elaborated by carrying out cryptanalysis on system based on the RD. The method helps in escalations of the protection of double random phase encoding by cumulating the key length and the parameter amount, so that it vigorously can be used against various attacks. The forte of the suggested cryptographic system was verified using simulations with MATLAB 7.9.0 (R2008a). The efficiency of the suggested scheme includes the analysis using singular value decomposition (SVD), histogram and correlation coefficient.
{"title":"Image encryption algorithm based on rear-mountedphase mask and random decomposition","authors":"S. Yadav, H. Singh","doi":"10.37190/oa220204","DOIUrl":"https://doi.org/10.37190/oa220204","url":null,"abstract":"To escalate the image encryption a new method has been devised which includes double random phase encoding (DRPE) using rear phase masking and random decomposition (RD) technique stranded on fractional Fourier transform. Here, asymmetric cryptographic system is developed in fractional Fourier transform (FrFT) mode using two random phase masks (RPM) and a rear mounted phase mask. In the projected scheme a colored image is decomposed into R, G and B channels. The amplitude of each channel is normalized, phase encoded and modulated using RPM. The modulated R, G and B channels of the colored image are individually transformed using FrFT to produce corresponding encrypted image. The proposed scheme is authorized on grayscale image also. The norm behind the development of the suggested scheme has been elaborated by carrying out cryptanalysis on system based on the RD. The method helps in escalations of the protection of double random phase encoding by cumulating the key length and the parameter amount, so that it vigorously can be used against various attacks. The forte of the suggested cryptographic system was verified using simulations with MATLAB 7.9.0 (R2008a). The efficiency of the suggested scheme includes the analysis using singular value decomposition (SVD), histogram and correlation coefficient.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70014565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
A double-image encryption algorithm is proposed with the phase-truncated multiple-parameter Fresnel transform. Firstly, the pixel positions of two plaintext images are scrambled and then the results are merged into one image with the scrambling operation. Subsequently, the resulting image is encrypted by phase truncation and phase reservation in the multiple-parameter Fresnel transform domain. The phase information is scrambled by the affine transform and then recombined with the amplitude information. The final encryption image is obtained with the pixel scrambling and diffusion methods to further enhance the security of the image encryption system, where the scrambling and diffusion operations are based on logistic map, logistic-sine system and 2D logistic-adjusted-sine map. The image encryption scheme is robust against the common attacks due to the nonlinear properties of diffusion and phase truncation. Numerical simulation results verify the performance and the security of the proposed double-image algorithm based on the phase-truncated multiple-parameter Fresnel transform.
{"title":"Double-image encryption scheme based on the phase-truncated multiple-parameter Fresnel transform","authors":"Ling Zhou, _, Hang Zhou, Yan Ma, Nan-Run Zhou","doi":"10.37190/oa220202","DOIUrl":"https://doi.org/10.37190/oa220202","url":null,"abstract":"A double-image encryption algorithm is proposed with the phase-truncated multiple-parameter Fresnel transform. Firstly, the pixel positions of two plaintext images are scrambled and then the results are merged into one image with the scrambling operation. Subsequently, the resulting image is encrypted by phase truncation and phase reservation in the multiple-parameter Fresnel transform domain. The phase information is scrambled by the affine transform and then recombined with the amplitude information. The final encryption image is obtained with the pixel scrambling and diffusion methods to further enhance the security of the image encryption system, where the scrambling and diffusion operations are based on logistic map, logistic-sine system and 2D logistic-adjusted-sine map. The image encryption scheme is robust against the common attacks due to the nonlinear properties of diffusion and phase truncation. Numerical simulation results verify the performance and the security of the proposed double-image algorithm based on the phase-truncated multiple-parameter Fresnel transform.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70014675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Paulina Pyżalska, A. Głowacka-Sobotta, T. Matthews‑Brzozowska, B. Miśkowiak
Professional musicians are required to practice playing instruments for long hours, which often exerts significant impact on their health. Attention should be given to the specificity of playing each instrument, including uncomfortable and sustained body position and repetitive movements causing long-term strain of certain parts of the body. The aim of this study was to evaluate the impact of long-term playing wind and string instruments on the visual system. Ninety male and female subjects aged 15 to 30 years were included in the study and divided into two groups: musicians (Msc) and non-musicians (nMsc). Significantly less subjects in the Msc group had properly corrected vision, wore optical prescription recommended by an ophthalmologist/optometrist, and/or underwent any eye examination at all in their lifetime, even though more subjects in this group experienced certain asthenopic symptoms. Also, accommodative amplitude got statistically worse under dim illumination conditions, accommodative facility was significantly different between musicians and non-musicians, although there were no differences between the groups when tested in bright illumination. None of the music stands used by the study subjects met the respective standards concerning uniform illumination rates. Playing string and wind instruments is a challenge for the visual system due to the forced body and head positions, and asymmetry between the visual plane and the plane of regard as well as non-uniform illumination in the working environment. However, conditions such as correct working distance and proper tilt of the music stand may be beneficial to the visual system. It is the role of optometrists to properly educate their patients about the importance of appropriate vision correction, especially in dim light and under adverse working conditions and to communicate the impact of such conditions on the visual system.
{"title":"Selected visual parameters related to the working conditions of musicians","authors":"Paulina Pyżalska, A. Głowacka-Sobotta, T. Matthews‑Brzozowska, B. Miśkowiak","doi":"10.37190/oa220103","DOIUrl":"https://doi.org/10.37190/oa220103","url":null,"abstract":"Professional musicians are required to practice playing instruments for long hours, which often exerts significant impact on their health. Attention should be given to the specificity of playing each instrument, including uncomfortable and sustained body position and repetitive movements causing long-term strain of certain parts of the body. The aim of this study was to evaluate the impact of long-term playing wind and string instruments on the visual system. Ninety male and female subjects aged 15 to 30 years were included in the study and divided into two groups: musicians (Msc) and non-musicians (nMsc). Significantly less subjects in the Msc group had properly corrected vision, wore optical prescription recommended by an ophthalmologist/optometrist, and/or underwent any eye examination at all in their lifetime, even though more subjects in this group experienced certain asthenopic symptoms. Also, accommodative amplitude got statistically worse under dim illumination conditions, accommodative facility was significantly different between musicians and non-musicians, although there were no differences between the groups when tested in bright illumination. None of the music stands used by the study subjects met the respective standards concerning uniform illumination rates. Playing string and wind instruments is a challenge for the visual system due to the forced body and head positions, and asymmetry between the visual plane and the plane of regard as well as non-uniform illumination in the working environment. However, conditions such as correct working distance and proper tilt of the music stand may be beneficial to the visual system. It is the role of optometrists to properly educate their patients about the importance of appropriate vision correction, especially in dim light and under adverse working conditions and to communicate the impact of such conditions on the visual system.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70014693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
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