Pub Date : 2023-11-23DOI: 10.1080/17455030.2023.2285972
Sergey V. Kuznetsov
The Arruda – Boyce incompressible hyperelastic potentials are used for analyzing one-dimensional acoustic wave propagation in a semi-infinite nonlinearly elastic rod. It has been found that during ...
{"title":"Appearing shock waves in Arruda – Boyce incompressible rod","authors":"Sergey V. Kuznetsov","doi":"10.1080/17455030.2023.2285972","DOIUrl":"https://doi.org/10.1080/17455030.2023.2285972","url":null,"abstract":"The Arruda – Boyce incompressible hyperelastic potentials are used for analyzing one-dimensional acoustic wave propagation in a semi-infinite nonlinearly elastic rod. It has been found that during ...","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-12DOI: 10.1080/17455030.2023.2280774
A. Soltani, M. Soltani, O. Civalek
AbstractThis work purposes to familiarize a novel, straightforward, and low-cost technique to accurately evaluate the sustainable lateral buckling load of non-uniform sandwich I-shaped nanobeam subjected to flexural loading. The weak form governing differential equations of the problem, which includes both lateral displacement and twisting angle, originates in the context of Eringen's non-local elasticity theory and Vlasov's model for non-uniform torsion, along with the classical laminated plate theory. From the mathematical viewpoint, the resulting variational formula is rewritten solitary based on the twisting angle. Finally, the Ritz technique is used to solve the equations and estimate the endurable lateral buckling load. The most crucial advantageous specification of the developed formula is the simplification of the fundamental computational complexities for calculating the endurable transverse buckling load of nanoscale non-uniform three-layered I-section beam elements. After checking the accuracy and reliability of the proposed analytical methodology, comprehensive parameterization research is conducted to investigate the sensitivity of lateral buckling resistance to the tapering parameter, non-local parameter, end moment ratio, volume fraction exponent, and thickness ratio. Numerical outcomes represent that in most cases, the extracted formula not only achieves the endurable buckling capacity precisely but also requires far less central processing unit time.KEYWORDS: Sandwich nanobeam; tapered I-section; functionally graded core; non-local parameter; lateral stability; Ritz method Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Stability analysis of nanoscale non-uniform sandwich I-section beams with AFG core and two metal face-sheets under flexural loadings","authors":"A. Soltani, M. Soltani, O. Civalek","doi":"10.1080/17455030.2023.2280774","DOIUrl":"https://doi.org/10.1080/17455030.2023.2280774","url":null,"abstract":"AbstractThis work purposes to familiarize a novel, straightforward, and low-cost technique to accurately evaluate the sustainable lateral buckling load of non-uniform sandwich I-shaped nanobeam subjected to flexural loading. The weak form governing differential equations of the problem, which includes both lateral displacement and twisting angle, originates in the context of Eringen's non-local elasticity theory and Vlasov's model for non-uniform torsion, along with the classical laminated plate theory. From the mathematical viewpoint, the resulting variational formula is rewritten solitary based on the twisting angle. Finally, the Ritz technique is used to solve the equations and estimate the endurable lateral buckling load. The most crucial advantageous specification of the developed formula is the simplification of the fundamental computational complexities for calculating the endurable transverse buckling load of nanoscale non-uniform three-layered I-section beam elements. After checking the accuracy and reliability of the proposed analytical methodology, comprehensive parameterization research is conducted to investigate the sensitivity of lateral buckling resistance to the tapering parameter, non-local parameter, end moment ratio, volume fraction exponent, and thickness ratio. Numerical outcomes represent that in most cases, the extracted formula not only achieves the endurable buckling capacity precisely but also requires far less central processing unit time.KEYWORDS: Sandwich nanobeam; tapered I-section; functionally graded core; non-local parameter; lateral stability; Ritz method Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"4 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135037672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-12DOI: 10.1080/17455030.2023.2280848
Xi Gao, Sijie Yin, Guofu Wang, Mimi Qin, Xianming Xie
AbstractA novel checkerboard metasurface is proposed to realize broadband ultra-low radar cross-section reduction (RCSR). The metasurface element is a non-uniform array which contains two uniform subarrays composed of 3 × 6 metallic patches. The reflection phases of the two subarrays can be compensated each other. Based on this characteristic, the non-uniform element reflects two orthogonally polarized waves with a phase difference shrinking to 180 ± 20° in a wideband from 11.2 to 23.0 GHz. When the non-uniform elements are arranged into a checkerboard structure, two co-polarized reflective waves with phase difference of 180 ± 20° are then generated for arbitrary polarized incident waves, resulting in an ultra-low RCS reduction. Simulation results show that the proposed checkerboard metasurface achieves at least 15 dB RCS reduction from 11.2 to 23 GHz (69%) for normal incident waves. The experimental results are good agreement with the simulations.KEYWORDS: Metasurfaceultra-low RCSnonuniform elements Disclosure statementNo potential conflict of interest was reported by the author(s).Data availabilityDate underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.Statement of noveltyThe metasurfaces have shown great application prospects in radar cross-section reduction (RCSR). Many metasurfaces have been successfully designed to obtain 10 dB RCSR. With the development of various radar technologies, however, the 10 dB RCSR can no longer meet the stealth requirements. Therefore, deeper and wider radar cross-section (RCS) reduction are always the main concerns of stealth technology. Based on this consideration, we present a checkerboard metasurface that can realize broadband 15 dB RCSR. The metasurface element is a non-uniform patches array, which is composed of two uniform subarrays of 3 × 6 metallic patches. The reflection phases of the two subarrays can be compensated each other, which makes the non-uniform element reflect two orthogonally polarized waves with a phase difference a lot closer to 180o (180 ± 20o) in a wideband. Then the phase cancelation mechanism is generated by orthogonally arranging the non-uniform element into a checkerboard structure, resulting in ultra-low RCS from 12.5–23.7 GHz. This work has potential application in the field of the stealthy platform.Additional informationFundingThis work was supported by National Natural Science Foundation of China [62361004, 62161002, 62161003]; Natural Science Foundation of Guangxi Province [2021GXNSFDA220003, 2020GXNSFAA297018]; Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology [DH202223]; National Key Research and Development Program of China [2021YFA0715404, 2022YFE0134600].
{"title":"Ultra-low radar cross-section realized by metasurface with nonuniform elements","authors":"Xi Gao, Sijie Yin, Guofu Wang, Mimi Qin, Xianming Xie","doi":"10.1080/17455030.2023.2280848","DOIUrl":"https://doi.org/10.1080/17455030.2023.2280848","url":null,"abstract":"AbstractA novel checkerboard metasurface is proposed to realize broadband ultra-low radar cross-section reduction (RCSR). The metasurface element is a non-uniform array which contains two uniform subarrays composed of 3 × 6 metallic patches. The reflection phases of the two subarrays can be compensated each other. Based on this characteristic, the non-uniform element reflects two orthogonally polarized waves with a phase difference shrinking to 180 ± 20° in a wideband from 11.2 to 23.0 GHz. When the non-uniform elements are arranged into a checkerboard structure, two co-polarized reflective waves with phase difference of 180 ± 20° are then generated for arbitrary polarized incident waves, resulting in an ultra-low RCS reduction. Simulation results show that the proposed checkerboard metasurface achieves at least 15 dB RCS reduction from 11.2 to 23 GHz (69%) for normal incident waves. The experimental results are good agreement with the simulations.KEYWORDS: Metasurfaceultra-low RCSnonuniform elements Disclosure statementNo potential conflict of interest was reported by the author(s).Data availabilityDate underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.Statement of noveltyThe metasurfaces have shown great application prospects in radar cross-section reduction (RCSR). Many metasurfaces have been successfully designed to obtain 10 dB RCSR. With the development of various radar technologies, however, the 10 dB RCSR can no longer meet the stealth requirements. Therefore, deeper and wider radar cross-section (RCS) reduction are always the main concerns of stealth technology. Based on this consideration, we present a checkerboard metasurface that can realize broadband 15 dB RCSR. The metasurface element is a non-uniform patches array, which is composed of two uniform subarrays of 3 × 6 metallic patches. The reflection phases of the two subarrays can be compensated each other, which makes the non-uniform element reflect two orthogonally polarized waves with a phase difference a lot closer to 180o (180 ± 20o) in a wideband. Then the phase cancelation mechanism is generated by orthogonally arranging the non-uniform element into a checkerboard structure, resulting in ultra-low RCS from 12.5–23.7 GHz. This work has potential application in the field of the stealthy platform.Additional informationFundingThis work was supported by National Natural Science Foundation of China [62361004, 62161002, 62161003]; Natural Science Foundation of Guangxi Province [2021GXNSFDA220003, 2020GXNSFAA297018]; Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology [DH202223]; National Key Research and Development Program of China [2021YFA0715404, 2022YFE0134600].","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"3 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-09DOI: 10.1080/17455030.2023.2280910
Umma Imon, M. S. Alam
AbstractTo explore the effect of the head-on collision (such as phase shifts, collisional processes, and production of solitons) of ion-acoustic waves (IAWs), a collisionless unmagnetized electron-positron-ion (e-p-i) plasma is considered. The electrons and positrons follow the generalized (r,q) distribution. To do this, using the extended Poincaré-Lighthill-Kuo (ePLK) approach, the two-sided Korteweg-de Vries (KdV) equations and phase shifts are derived. The main aim of this study is to investigate the consequence of spectral indices r and q on both the negative and positive phase changes following an IAW-to-IAW collision. It is found that for the effects of the spectral indices of electrons and positrons both positive and negative phase shifts after head-on collisions are modified. The compressive (only hump-shaped) as well as rarefactive (both hump and dip-shaped) solitons become produced for the effect of spectral indices. The results obtained in the study may be helpful to understand the collision processes as well as the consequence of the head-on collision of IAWs in electron-positron-ion plasmas in the ionosphere, auroral acceleration regions, solar wind, Saturn rings, active galactic nuclei, polar cup of fast rotating neutron stars, semiconductor plasmas, and intense laser fields as well as in laboratory experiment.KEYWORD: Phase shifte-p-i plasma(r,q) distributionIAWskappa distribution AcknowledgementThe authors express their sincere thanks to Professor Dr. M. R. Talukder, Department of Electrical and Electronic Engineering, Rajshahi University, Rajshahi, Bangladesh, for his fruitful suggestion and encouragement.Disclosure statementNo potential conflict of interest was reported by the author(s).
摘要为了探讨离子-声波(IAWs)正面碰撞(如相移、碰撞过程和孤子的产生)的影响，考虑了一个无磁化电子-正电子-离子(e-p-i)等离子体。电子和正电子遵循广义(r,q)分布。为此，使用扩展的poincar - lighthill - kuo (ePLK)方法，推导了双边Korteweg-de Vries (KdV)方程和相移。本研究的主要目的是研究光谱指数r和q对iaw与iaw碰撞后负和正相位变化的影响。研究发现，对于电子和正电子的谱指数的影响，正负相移和正负相移都被修正。压缩孤子(只有驼峰形)和稀薄孤子(驼峰形和倾斜形)都是由于光谱指数的影响而产生的。研究结果有助于理解电离层中电子-正电子-离子等离子体、极光加速区、太阳风、土星环、活动星系核、快速旋转中子星的极杯、半导体等离子体、强激光场和实验室实验中iws正面碰撞的过程和后果。关键词:相移-p-i等离子体(r,q)分布iawskappa分布致谢感谢孟加拉国Rajshahi大学电气与电子工程系M. r. Talukder教授富有成效的建议和鼓励。披露声明作者未报告潜在的利益冲突。
{"title":"Consequence of head-on collision of ion acoustic waves in unmagnetized plasmas having generalized ( <i>r</i> , <i>q</i> ) distributed electrons and positrons","authors":"Umma Imon, M. S. Alam","doi":"10.1080/17455030.2023.2280910","DOIUrl":"https://doi.org/10.1080/17455030.2023.2280910","url":null,"abstract":"AbstractTo explore the effect of the head-on collision (such as phase shifts, collisional processes, and production of solitons) of ion-acoustic waves (IAWs), a collisionless unmagnetized electron-positron-ion (e-p-i) plasma is considered. The electrons and positrons follow the generalized (r,q) distribution. To do this, using the extended Poincaré-Lighthill-Kuo (ePLK) approach, the two-sided Korteweg-de Vries (KdV) equations and phase shifts are derived. The main aim of this study is to investigate the consequence of spectral indices r and q on both the negative and positive phase changes following an IAW-to-IAW collision. It is found that for the effects of the spectral indices of electrons and positrons both positive and negative phase shifts after head-on collisions are modified. The compressive (only hump-shaped) as well as rarefactive (both hump and dip-shaped) solitons become produced for the effect of spectral indices. The results obtained in the study may be helpful to understand the collision processes as well as the consequence of the head-on collision of IAWs in electron-positron-ion plasmas in the ionosphere, auroral acceleration regions, solar wind, Saturn rings, active galactic nuclei, polar cup of fast rotating neutron stars, semiconductor plasmas, and intense laser fields as well as in laboratory experiment.KEYWORD: Phase shifte-p-i plasma(r,q) distributionIAWskappa distribution AcknowledgementThe authors express their sincere thanks to Professor Dr. M. R. Talukder, Department of Electrical and Electronic Engineering, Rajshahi University, Rajshahi, Bangladesh, for his fruitful suggestion and encouragement.Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":" 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135291144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-05DOI: 10.1080/17455030.2023.2277893
Akhtar Zaman, Muhammad Haneef, Humayun Khan, B. A. Bacha, H. I. Elsaeedy
AbstractA high magneto-optical medium is used to modify atom localization by magnetic loss and absorption spectrum with para and dia magnetization distribution. The localization is investigated in the range of −0.1λ≤y≤0.1λ or λ/5 distance along x-axis and y-axis. Dia-magnetization hole is investigated within the range λ/10 along x-axis and y-axis. Crater-type atom localization peak is reported by a magnetic loss, and a burner-like localization peak is investigated by absorption with dia-magnetization hole distribution. A para-magnetization hole is also investigated in the range of −0.05λ≤x,y≤0.05λ. Gaussian-type atom localization peaks are investigated by both magnetic loss and absorption spectrum in the para-magnetization hole region. Depth and grave-type atom localization is also reported in the para and dia-magnetic region by absorption and magnetic loss spectrum.Keywords: Atom localizationmagnetization distributionmagnetic lossabsorptionnano-lithography Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from the corresponding author, [Muhammad Haneef], upon reasonable requestAdditional informationFundingThe authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through a large group Research Project under grant number RGP.2/151/44.
{"title":"Para- and dia-magnetization distribution via localization of atom by absorption and magnetic loss","authors":"Akhtar Zaman, Muhammad Haneef, Humayun Khan, B. A. Bacha, H. I. Elsaeedy","doi":"10.1080/17455030.2023.2277893","DOIUrl":"https://doi.org/10.1080/17455030.2023.2277893","url":null,"abstract":"AbstractA high magneto-optical medium is used to modify atom localization by magnetic loss and absorption spectrum with para and dia magnetization distribution. The localization is investigated in the range of −0.1λ≤y≤0.1λ or λ/5 distance along x-axis and y-axis. Dia-magnetization hole is investigated within the range λ/10 along x-axis and y-axis. Crater-type atom localization peak is reported by a magnetic loss, and a burner-like localization peak is investigated by absorption with dia-magnetization hole distribution. A para-magnetization hole is also investigated in the range of −0.05λ≤x,y≤0.05λ. Gaussian-type atom localization peaks are investigated by both magnetic loss and absorption spectrum in the para-magnetization hole region. Depth and grave-type atom localization is also reported in the para and dia-magnetic region by absorption and magnetic loss spectrum.Keywords: Atom localizationmagnetization distributionmagnetic lossabsorptionnano-lithography Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from the corresponding author, [Muhammad Haneef], upon reasonable requestAdditional informationFundingThe authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through a large group Research Project under grant number RGP.2/151/44.","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"55 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-03DOI: 10.1080/17455030.2023.2277378
Shahana Rizvi, Muhammad Afzal
AbstractThe current study examines how electromagnetic waves scatter when encountering plasma medium and step-discontinuities. The physical model used in the study includes dielectric and plasma layers separated by horizontal plates made of metallic conducting material. The problem of interest is solved using the Mode-matching technique, which projects the solution onto an orthogonal basis to explain how planar mode excitation is reflected, transmitted, and attenuated. The mathematical and intrinsic power analyses confirm the accuracy of the algebra and solution scheme used. The analysis provides an understanding of both the mathematical and theoretical aspects of the structure under consideration.Keywords: Electromagnetic wavesscatteringcold plasmametallic conductingmode-matching Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"The electromagnetic wave propagation in discontinuous waveguide containing plasma","authors":"Shahana Rizvi, Muhammad Afzal","doi":"10.1080/17455030.2023.2277378","DOIUrl":"https://doi.org/10.1080/17455030.2023.2277378","url":null,"abstract":"AbstractThe current study examines how electromagnetic waves scatter when encountering plasma medium and step-discontinuities. The physical model used in the study includes dielectric and plasma layers separated by horizontal plates made of metallic conducting material. The problem of interest is solved using the Mode-matching technique, which projects the solution onto an orthogonal basis to explain how planar mode excitation is reflected, transmitted, and attenuated. The mathematical and intrinsic power analyses confirm the accuracy of the algebra and solution scheme used. The analysis provides an understanding of both the mathematical and theoretical aspects of the structure under consideration.Keywords: Electromagnetic wavesscatteringcold plasmametallic conductingmode-matching Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"29 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135819758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-02DOI: 10.1080/17455030.2022.2078016
Chunjie Zhang, Peng Liu, Haipeng Wang, Yaqiu Jin
AbstractSynthetic aperture radar (SAR) is an active microwave imaging sensor for high-resolution observation, with the ability of working in all-weather and all-day. Recently, SAR images have been widely used in many fields. Among them, ship detection in single-channel SAR images is a significant part of civilian and military fields. This article first discusses the characteristic of SAR images and the detectability of ships, then summarizes the recent advance of traditional and deep learning-based methods used for ship detection in single-channel SAR images. In addition, the characteristics and existing problems of various methods are discussed and their future development trends are predicted. Aiming at the problems of the large amount of calculation, multi-scale and densely docked ship detection in single-channel SAR images, an improved deep learning-based detection algorithm is proposed, which has achieved excellent performance on the SAR ship detection dataset (SSDD).Keywords: Synthetic aperture radar (SAR)ship detectionsingle-channeldeep learning Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the NSFC Project under Grant 61771142.
{"title":"A review of recent advance of ship detection in single-channel SAR images","authors":"Chunjie Zhang, Peng Liu, Haipeng Wang, Yaqiu Jin","doi":"10.1080/17455030.2022.2078016","DOIUrl":"https://doi.org/10.1080/17455030.2022.2078016","url":null,"abstract":"AbstractSynthetic aperture radar (SAR) is an active microwave imaging sensor for high-resolution observation, with the ability of working in all-weather and all-day. Recently, SAR images have been widely used in many fields. Among them, ship detection in single-channel SAR images is a significant part of civilian and military fields. This article first discusses the characteristic of SAR images and the detectability of ships, then summarizes the recent advance of traditional and deep learning-based methods used for ship detection in single-channel SAR images. In addition, the characteristics and existing problems of various methods are discussed and their future development trends are predicted. Aiming at the problems of the large amount of calculation, multi-scale and densely docked ship detection in single-channel SAR images, an improved deep learning-based detection algorithm is proposed, which has achieved excellent performance on the SAR ship detection dataset (SSDD).Keywords: Synthetic aperture radar (SAR)ship detectionsingle-channeldeep learning Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the NSFC Project under Grant 61771142.","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"68 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135975606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-02DOI: 10.1080/17455030.2023.2192551
Akira Ishimaru, Gary Brown, Valery Zavorotny, Saba Mudaliar
"Special issue in honor of V.I. Tatarskii (1929–2020)." Waves in Random and Complex Media, 33(5-6), pp. 1169–1170 Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Special issue in honor of V.I. Tatarskii (1929–2020)","authors":"Akira Ishimaru, Gary Brown, Valery Zavorotny, Saba Mudaliar","doi":"10.1080/17455030.2023.2192551","DOIUrl":"https://doi.org/10.1080/17455030.2023.2192551","url":null,"abstract":"\"Special issue in honor of V.I. Tatarskii (1929–2020).\" Waves in Random and Complex Media, 33(5-6), pp. 1169–1170 Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"68 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135975602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2023-11-02DOI: 10.1080/17455030.2022.2128227
Akira Ishimaru
AbstractExtensive research has been reported on MIMO systems for complex environments. It is noted that many communications studies make use of the channel matrix of transmitters and receivers, signal vectors, SNR, and eigenvalues. However, the channel matrix is often expressed in terms of channel modeling, and the detailed statistical characteristics of the channel in terms of physical characteristics of atmospheric turbulence, particulate matter, and rough surfaces and terrain are often not explicitly shown. This paper discusses the inclusion of expressions of physical characteristics of the random medium in the channel matrix. Therefore, the key point of this paper is that the channel matrix is explicitly given in terms of the actual physical parameters of the random environment using the mutual coherence function and stochastic Green’s functions; we call this a ‘physics-based’ communications model. This paper presents a formulation of physics-based communications models in the presence of a random medium based on analytical statistical EM theory. We use the keyhole MIMO as an example to show the key points of this approach. It is hoped that this study may help extend channel modeling to include analytical statistical EM theory for atmospheric turbulence, ocean turbulence, and rough terrain.KEYWORDS: Channel capacitycommunicationsMIMOrandom media AcknowledgementsThe careful assistance and insights of John Ishimaru are gratefully appreciated.Disclosure statementNo potential conflict of interest was reported by the author(s).
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Pub Date : 2023-11-02DOI: 10.1080/17455030.2022.2099595
A. G. Vinogradov
AbstractWe evaluate the correlation function of a radar signal scattered by inhomogeneities of turbulent medium and received by a radar station at the output of the matched filter. For the turbulent medium, we employ the model of wandering inhomogeneities, which is a generalization of the ‘frozen’ turbulence. The concepts of strong and weak wanderings are introduced. The case of bistatic radar station is considered. For a monostatic radar station, simple asymptotic formulas are obtained. It is shown that, in the short-wavelength limit, wanderings are almost always strong, and in the long-wavelength limit, the weak wandering limit takes place mainly in the long-wavelength approximation.Keywords: Scattering of wavesturbulencecorrelation functionradarmatched filteruncertainty function Disclosure statementNo potential conflict of interest was reported by the author.
{"title":"Single scattering: correlation function of a signal at the output of matched filter","authors":"A. G. Vinogradov","doi":"10.1080/17455030.2022.2099595","DOIUrl":"https://doi.org/10.1080/17455030.2022.2099595","url":null,"abstract":"AbstractWe evaluate the correlation function of a radar signal scattered by inhomogeneities of turbulent medium and received by a radar station at the output of the matched filter. For the turbulent medium, we employ the model of wandering inhomogeneities, which is a generalization of the ‘frozen’ turbulence. The concepts of strong and weak wanderings are introduced. The case of bistatic radar station is considered. For a monostatic radar station, simple asymptotic formulas are obtained. It is shown that, in the short-wavelength limit, wanderings are almost always strong, and in the long-wavelength limit, the weak wandering limit takes place mainly in the long-wavelength approximation.Keywords: Scattering of wavesturbulencecorrelation functionradarmatched filteruncertainty function Disclosure statementNo potential conflict of interest was reported by the author.","PeriodicalId":23598,"journal":{"name":"Waves in Random and Complex Media","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135975607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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