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学者姓名:赖云锋
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Helicity-dependent photocurrent (HDPC) and its modulation in topological insulator Bi2Te3 nanowires have been investigated. It is revealed that when the incident plane of a laser is perpendicular to the nanowire, the HDPC is an odd function of the incident angle, which is mainly contributed by the circular photogalvanic effect originating from the surface states of Bi2Te3 nanowire. When the incident plane of a laser is parallel to the nanowire, the HDPC is approximately an even function of the incident angle, which is due to the circular photon drag effect coming from the surface states. It is found that the HDPC can be effectively tuned by the back gate and the ionic liquid top gate. By analyzing the substrate dependence of the HDPC, we find that the HDPC of the Bi2Te3 nanowire on the Si substrate is an order of magnitude larger than that on SiO2, which may be due to the spin injection from the Si substrate to the Bi2Te3 nanowire. In addition, by applying different biases, the Stokes parameters of a polarized light can be extracted by arithmetic operation of the photocurrents measured in the Bi2Te3 nanowire. This work suggests that topological insulator Bi2Te3 nanowires may provide a good platform for opto-spintronic devices, especially in chirality and polarimtry detection. © 2024 American Chemical Society.
Keyword :
Bi2Te3 Nanowires Bi2Te3 Nanowires Helicity Dependent Photocurrent Helicity Dependent Photocurrent Ionic Liquid Gating Ionic Liquid Gating Stokes Parameter Detection Stokes Parameter Detection Substrates Substrates
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GB/T 7714 | Yu, Q. , Feng, S. , Yu, J. et al. Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires [J]. | ACS Applied Materials and Interfaces , 2024 , 16 (30) : 40297-40308 . |
MLA | Yu, Q. et al. "Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires" . | ACS Applied Materials and Interfaces 16 . 30 (2024) : 40297-40308 . |
APA | Yu, Q. , Feng, S. , Yu, J. , Cheng, S. , Lai, Y. , Chen, Y. et al. Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires . | ACS Applied Materials and Interfaces , 2024 , 16 (30) , 40297-40308 . |
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Chiral metasurfaces with high quality factors (Q-factors) are a promising platform for achieving chiral optical responses. However, the optical properties of most metasurfaces are fixed once they are fabricated. Here, we study the effect of phase-change material Ge2Sb2Te5 (GST) on the chiral optics of a planar chiral Si metasurface driven by bound states in the continuum (BICs), as the refractive index of the phase-change material changes before and after the phase change. The planar chiral silicon metasurface is capable of generating near-unity (0.99) circular dichroism and giant (0.996) linear dichroism in the infrared region. Notably, phase-change material GST is integrated into the Z-shaped Si metasurfaces. We actively tune the dissipative loss by causing the GST to undergo a phase transition, thereby modulating the optical chirality. In addition, we numerically simulate the effect of the thickness of the phase-change layer and the embedded position on the optical response. Compared with single-functional metasurfaces, this device exhibits better flexibility and more functionalities. It is demonstrated that the optical chirality of the metasurface can be well controlled using the phase-change material GST. © 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
Keyword :
Chirality Chirality Chitin Chitin Germanium alloys Germanium alloys Germanium compounds Germanium compounds Light modulation Light modulation Network security Network security Phase shift Phase shift Q factor measurement Q factor measurement Silicon wafers Silicon wafers
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GB/T 7714 | Chen, Can , Yu, Jinling , Kang, Chen et al. Chiral optical modulation of Si-Ge2Sb2Te5 composite metasurfaces driven by quasi-bound states in the continuum [J]. | Applied Optics , 2024 , 63 (29) : 7682-7691 . |
MLA | Chen, Can et al. "Chiral optical modulation of Si-Ge2Sb2Te5 composite metasurfaces driven by quasi-bound states in the continuum" . | Applied Optics 63 . 29 (2024) : 7682-7691 . |
APA | Chen, Can , Yu, Jinling , Kang, Chen , Chen, Yonghai , Lai, Yunfeng , Cheng, Shuying . Chiral optical modulation of Si-Ge2Sb2Te5 composite metasurfaces driven by quasi-bound states in the continuum . | Applied Optics , 2024 , 63 (29) , 7682-7691 . |
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Orthogonal eigenmodes in multimode waveguides are an indispensable physical dimension for enhancing the capacity of optical communications, and efficient mode converters are therefore of vital functional significance. However, the conventional single-pair mode conversion in a single device is having difficulty meeting the ever-increasing demand for optical capacity. By contrast, the multi-pair mode converter can improve the multiplexing capacity and be further applied in spatial-mode-oriented passive signal switching and permutation cipher. Here, a scalable multi-mode converting model, combing the multimode interference and beam shaping by exploiting subwavelength metamaterials, is firstly reported to enable simultaneous multi-spatial-mode manipulation and break its polarization-dependency limit. Based on this model, five proof-of-concept converters are designed, realizing polarization-independent, and multi-mode conversions, or a combination of both within compact lengths (< 17.436 mm). For the first time, TE0/TM0-to-TE2/TM2, TE0/TE1/TE2-to-TE2/TE3/ TE4, TE0/TE1/TM0/TM1-to-TE2/TE3/TM2/TM3, and TE0/TE1-to-TE1/TE2 converters are reported and experimentally demonstrated, covering a double/triple/quadruple-mode manipulation in a single device. From measurements, these converters exhibit low insertion losses (0.72 to 1.65 dB) and intermodal crosstalks (-30.26 to -12.19 dB) at 1550 nm, and have a 56-nm/30-nm bandwidth of loss < 1.4 dB/1.9 dB and crosstalk < -13 dB/-10.5 dB, for the best/worst case. The proposed multi-mode converting model can manipulate multiple input modes in parallel and beak the polarization-dependency limit for multi-spatial-mode conversion, which holds great potential for spatial-mode-oriented nanophotonic systems. IEEE
Keyword :
Crosstalk Crosstalk integrated optical devices integrated optical devices Mode division (de)multiplexing Mode division (de)multiplexing mode-order converter mode-order converter Optical fiber sensors Optical fiber sensors Optical polarization Optical polarization Perturbation methods Perturbation methods Scalability Scalability Solid modeling Solid modeling System-on-chip System-on-chip
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GB/T 7714 | Guo, Z. , Xiao, J. , Wu, S. et al. Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings [J]. | Journal of Lightwave Technology , 2024 , 42 (20) : 1-14 . |
MLA | Guo, Z. et al. "Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings" . | Journal of Lightwave Technology 42 . 20 (2024) : 1-14 . |
APA | Guo, Z. , Xiao, J. , Wu, S. , Lai, Y. , Cheng, S. . Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings . | Journal of Lightwave Technology , 2024 , 42 (20) , 1-14 . |
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Orthogonal eigenmodes in multimode waveguides are an indispensable physical dimension for enhancing the capacity of optical communications, and efficient mode converters are therefore of vital functional significance. However, the conventional single-pair mode conversion in a single device is having difficulty meeting the ever-increasing demand for optical capacity. By contrast, the multi-pair mode converter can improve the multiplexing capacity and be further applied in spatial-mode-oriented passive signal switching and permutation cipher. Here, a scalable multi-mode converting model, combing the multimode interference and beam shaping by exploiting subwavelength metamaterials, is firstly reported to enable simultaneous multi-spatial-mode manipulation and break its polarization-dependency limit. Based on this model, five proof-of-concept converters are designed, realizing polarization-independent, and multi-mode conversions, or a combination of both within compact lengths (< 17.436 mu m). For the first time, TE0/TM0-to-TE2/TM2, TE0/TE1/TE2-to-TE2/TE3/ TE4, TE0/TE1/TM0/TM1-to-TE2/TE3/TM2/TM3, and TE0/TE1-to-TE1/TE2 converters are reported and experimentally demonstrated, covering a double/triple/quadruple-mode manipulation in a single device. From measurements, these converters exhibit low insertion losses (0.72 to 1.65 dB) and intermodal crosstalks (-30.26 to -12.19 dB) at 1550 nm, and have a 56-nm/30-nm bandwidth of loss < 1.4 dB/1.9 dB and crosstalk < -13 dB/-10.5 dB, for the best/worst case. The proposed multi-mode converting model can manipulate multiple input modes in parallel and beak the polarization-dependency limit for multi-spatial-mode conversion, which holds great potential for spatial-mode-oriented nanophotonic systems.
Keyword :
Integrated optical devices Integrated optical devices mode division (de)multiplexing mode division (de)multiplexing mode-order converter mode-order converter
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GB/T 7714 | Guo, Zhenzhao , Xiao, Jinbiao , Wu, Shengbao et al. Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2024 , 42 (20) : 7267-7281 . |
MLA | Guo, Zhenzhao et al. "Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 42 . 20 (2024) : 7267-7281 . |
APA | Guo, Zhenzhao , Xiao, Jinbiao , Wu, Shengbao , Lai, Yunfeng , Cheng, Shuying . Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2024 , 42 (20) , 7267-7281 . |
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Helicity-dependent photocurrent (HDPC) of the surface states in a high-quality topological insulator (Bi0.7Sb0.3)(2)Te-3 nanoplate grown by chemical vapor deposition (CVD) is investigated. By investigating the angle-dependent HDPC, it is found that the HDPC is mainly contributed by the circular photogalvanic effect (CPGE) current when the incident plane is perpendicular to the connection of the two contacts, whereas the circular photon drag effect (CPDE) dominates the HDPC when the incident plane is parallel to the connection of the two contacts. In addition, the CPGE of the (Bi0.7Sb0.3)(2)Te-3 nanoplate is regulated by temperature, light power, excitation wavelength, the source-drain and ionic liquid top-gate voltages, and the regulation mechanisms are discussed. It is demonstrated that (Bi0.7Sb0.3)(2)Te-3 nanoplates may provide a good platform for novel opto-spintronics devices.
Keyword :
(Bi0.7Sb0.3)(2)Te-3 nanoplate (Bi0.7Sb0.3)(2)Te-3 nanoplate circular photogalvanic effect circular photogalvanic effect helicity-dependent photocurrent helicity-dependent photocurrent ionic liquid gating ionic liquid gating
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GB/T 7714 | Yu, Qin , Yu, Jinling , Chen, Yonghai et al. Investigation of helicity-dependent photocurrent of surface states in (Bi0.7Sb0.3)2Te3 nanoplate [J]. | CHINESE PHYSICS B , 2024 , 33 (5) . |
MLA | Yu, Qin et al. "Investigation of helicity-dependent photocurrent of surface states in (Bi0.7Sb0.3)2Te3 nanoplate" . | CHINESE PHYSICS B 33 . 5 (2024) . |
APA | Yu, Qin , Yu, Jinling , Chen, Yonghai , Lai, Yunfeng , Cheng, Shuying , He, Ke . Investigation of helicity-dependent photocurrent of surface states in (Bi0.7Sb0.3)2Te3 nanoplate . | CHINESE PHYSICS B , 2024 , 33 (5) . |
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Helicity-dependent photocurrent (HDPC) and its modulation in topological insulator Bi2Te3 nanowires have been investigated. It is revealed that when the incident plane of a laser is perpendicular to the nanowire, the HDPC is an odd function of the incident angle, which is mainly contributed by the circular photogalvanic effect originating from the surface states of Bi2Te3 nanowire. When the incident plane of a laser is parallel to the nanowire, the HDPC is approximately an even function of the incident angle, which is due to the circular photon drag effect coming from the surface states. It is found that the HDPC can be effectively tuned by the back gate and the ionic liquid top gate. By analyzing the substrate dependence of the HDPC, we find that the HDPC of the Bi2Te3 nanowire on the Si substrate is an order of magnitude larger than that on SiO2, which may be due to the spin injection from the Si substrate to the Bi2Te3 nanowire. In addition, by applying different biases, the Stokes parameters of a polarized light can be extracted by arithmetic operation of the photocurrents measured in the Bi2Te3 nanowire. This work suggests that topological insulator Bi2Te3 nanowires may provide a good platform for opto-spintronic devices, especially in chirality and polarimtry detection.
Keyword :
Bi2Te3 Nanowires Bi2Te3 Nanowires Helicity DependentPhotocurrent Helicity DependentPhotocurrent Ionic Liquid Gating Ionic Liquid Gating Stokes ParameterDetection Stokes ParameterDetection Substrates Substrates
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GB/T 7714 | Yu, Qin , Feng, Shizun , Yu, Jinling et al. Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires [J]. | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (30) : 40297-40308 . |
MLA | Yu, Qin et al. "Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires" . | ACS APPLIED MATERIALS & INTERFACES 16 . 30 (2024) : 40297-40308 . |
APA | Yu, Qin , Feng, Shizun , Yu, Jinling , Cheng, Shuying , Lai, Yunfeng , Chen, Yonghai et al. Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires . | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (30) , 40297-40308 . |
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Helicity-dependent photocurrent (HDPC) of the surface states in a high-quality topological insulator (Bi0.7Sb0.3)2Te3 nanoplate grown by chemical vapor deposition (CVD) is investigated. By investigating the angle-dependent HDPC, it is found that the HDPC is mainly contributed by the circular photogalvanic effect (CPGE) current when the incident plane is perpendicular to the connection of the two contacts, whereas the circular photon drag effect (CPDE) dominates the HDPC when the incident plane is parallel to the connection of the two contacts. In addition, the CPGE of the (Bi0.7Sb0.3)2Te3 nanoplate is regulated by temperature, light power, excitation wavelength, the source–drain and ionic liquid top-gate voltages, and the regulation mechanisms are discussed. It is demonstrated that (Bi0.7Sb0.3)2Te3 nanoplates may provide a good platform for novel opto-spintronics devices.
Keyword :
(BiSb)Te nanoplate (BiSb)Te nanoplate circular photogalvanic effect circular photogalvanic effect helicity-dependent photocurrent helicity-dependent photocurrent ionic liquid gating ionic liquid gating
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GB/T 7714 | Qin Yu , Jinling Yu , Yonghai Chen et al. Investigation of helicity-dependent photocurrent of surface states in (BiSb)Te nanoplate [J]. | Chinese Physics B , 2024 , 33 (5) . |
MLA | Qin Yu et al. "Investigation of helicity-dependent photocurrent of surface states in (BiSb)Te nanoplate" . | Chinese Physics B 33 . 5 (2024) . |
APA | Qin Yu , Jinling Yu , Yonghai Chen , Yunfeng Lai , Shuying Cheng , Ke He . Investigation of helicity-dependent photocurrent of surface states in (BiSb)Te nanoplate . | Chinese Physics B , 2024 , 33 (5) . |
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The helicity-dependent photocurrent (HDPC) of Fe4GeTe2 (3, 5, 8, 10 nm)/Bi2Te3 (8 nm) heterostructures grown on sapphire substrates was systematically investigated. It is revealed that the HDPC is induced by the interface coupling between the Fe4GeTe2 and Bi2Te3 films, and it is dominated by the circular photogalvanic effect (CPGE) rather than by the circular photodrag effect (circular photon drag effect). As the tensile strain increases, the CPGE current decreases, which can be attributed to the decrease of the interface-induced spin-orbit coupling with increasing tensile strain. In addition, it is demonstrated that by applying appropriate tensile strain, the 5 nm Fe4GeTe2/Bi2Te3 sample can be used to detect the circular polarization state of a light. Finally, Fe4GeTe2 (5, 8, and 10 nm)/Bi2Te3 (8 nm) heterostructures show a T-C larger than 390 K. The dependence of the CPGE on the film thickness of Fe4GeTe2 is different from that of Curie temperature, indicating that the enhanced exchange interaction induced by the interface coupling may be the dominant mechanism for the high-T-C ferromagnetism. The large interface-induced CPGE in the Fe4GeTe2/Bi2Te3 suggests that Fe4GeTe2/Bi2Te3 heterostructures may provide a good platform for designing novel opto-spintronic devices.
Keyword :
2D ferromagnetic Fe4GeTe2/Bi2Te3 heterostructures 2D ferromagnetic Fe4GeTe2/Bi2Te3 heterostructures circular photogalvaniceffect circular photogalvaniceffect circular polarization detection circular polarization detection ferromagnetism ferromagnetism interface-induced helicity-dependentphotocurrent interface-induced helicity-dependentphotocurrent strain strain
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GB/T 7714 | Lin, Zongkai , Zhao, Runyu , Yu, Jinling et al. Investigation of Interface-Induced Helicity-Dependent Photocurrent and High-T C Ferromagnetism in Wafer-Scale 2D Ferromagnetic Fe4GeTe2/Bi2Te3 Heterostructures [J]. | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (49) : 68542-68552 . |
MLA | Lin, Zongkai et al. "Investigation of Interface-Induced Helicity-Dependent Photocurrent and High-T C Ferromagnetism in Wafer-Scale 2D Ferromagnetic Fe4GeTe2/Bi2Te3 Heterostructures" . | ACS APPLIED MATERIALS & INTERFACES 16 . 49 (2024) : 68542-68552 . |
APA | Lin, Zongkai , Zhao, Runyu , Yu, Jinling , Li, Qiang , Xie, Weiran , Lai, Yunfeng et al. Investigation of Interface-Induced Helicity-Dependent Photocurrent and High-T C Ferromagnetism in Wafer-Scale 2D Ferromagnetic Fe4GeTe2/Bi2Te3 Heterostructures . | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (49) , 68542-68552 . |
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Chiral metasurfaces with high quality factors (Q-factors) are a promising platform for achieving chiral optical responses. However, the optical properties of most metasurfaces are fixed once they are fabricated. Here, we study the effect of phase-change material Ge2Sb2Te5 (GST) on the chiral optics of a planar chiral Si metasurface driven by bound states in the continuum (BICs), as the refractive index of the phase-change material changes before and after the phase change. The planar chiral silicon metasurface is capable of generating near-unity (0.99) circular dichroism and giant (0.996) linear dichroism in the infrared region. Notably, phase-change material GST is integrated into the Z-shaped Si metasurfaces. We actively tune the dissipative loss by causing the GST to undergo a phase transition, thereby modulating the optical chirality. In addition, we numerically simulate the effect of the thickness of the phase-change layer and the embedded position on the optical response. Compared with single-functional metasurfaces, this device exhibits better flexibility and more functionalities. It is demonstrated that the optical chirality of the metasurface can be well controlled using the phase-change material GST. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
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GB/T 7714 | Chen, Can , Yu, Jinling , Kang, Chen et al. Chiral optical modulation of Si-Ge2Sb2Te5 2 Sb 2 Te 5 composite metasurfaces driven by quasi-bound states in the continuum [J]. | APPLIED OPTICS , 2024 , 63 (29) : 7682-7691 . |
MLA | Chen, Can et al. "Chiral optical modulation of Si-Ge2Sb2Te5 2 Sb 2 Te 5 composite metasurfaces driven by quasi-bound states in the continuum" . | APPLIED OPTICS 63 . 29 (2024) : 7682-7691 . |
APA | Chen, Can , Yu, Jinling , Kang, Chen , Chen, Yonghai , Lai, Yunfeng , Cheng, Shuying . Chiral optical modulation of Si-Ge2Sb2Te5 2 Sb 2 Te 5 composite metasurfaces driven by quasi-bound states in the continuum . | APPLIED OPTICS , 2024 , 63 (29) , 7682-7691 . |
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针对成捆原木端面检测存在由于目标密集而形成的大量小目标难以精确识别的问题,提出融合BiFPN(bidirectional weighted feature pyramid network,双向加权特征金字塔网络)和YOLOv5s的密集型原木端面检测方法。为了提高密集原木图像中小目标的平均精度和查全率,模型中添加了一个小目标检测层以保留更多的浅层语义信息;为避免添加了小目标检测层后特征融合过程中的信息丢失,进而导致特征相对复杂的目标误检率、漏检率升高,融合简化版的BiFPN,在特征融合结构中加入跨尺度连接线以保留更多深层的语义信息,二者结合进一步提高了模型的鲁棒性。为了深入验证该模型的有效性,采取COCO公共数据集评判指标,将原木目标分为大、中、小3种目标并分别进行测试分析。试验结果表明:改进的模型对大目标的查全率和平均精度分别为99.70%和98.79%,调和均值为0.991;中目标的查全率和平均精度分别为98.02%和97.90%,调和均值为0.975,大目标和中目标相比于原模型性能几乎不变;小目标的查全率和平均精度为97.25%和96.86%,相比于原模型分别提高了20.96%和21.13%,调和均值0.973,相比于原模型提高了0.114。改进的模型检测速度为平均每张图片11.89 ms,模型参数量为14.4 MB,仅比原模型高了0.7 MB。因此,改进后的模型具有检测精度高、鲁棒性强、轻量化等特点,为实际环境复杂多变、数量庞大的密集原木端面检测提供了一种可行的方法。
Keyword :
BiFPN BiFPN YOLOv5s YOLOv5s 密集原木端面检测 密集原木端面检测 小目标检测层 小目标检测层 目标检测 目标检测
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GB/T 7714 | 余平平 , 林耀海 , 赖云锋 et al. 融合BiFPN和YOLOv5s的密集型原木端面检测方法 [J]. | 林业工程学报 , 2023 , 8 (01) : 126-134 . |
MLA | 余平平 et al. "融合BiFPN和YOLOv5s的密集型原木端面检测方法" . | 林业工程学报 8 . 01 (2023) : 126-134 . |
APA | 余平平 , 林耀海 , 赖云锋 , 程树英 , 林培杰 . 融合BiFPN和YOLOv5s的密集型原木端面检测方法 . | 林业工程学报 , 2023 , 8 (01) , 126-134 . |
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