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Ning J, Zheng Y, Wang S, Jiang T, Zhao J, Chen K, Feng Y. Reconfigurable Tri-Mode Metasurface for Broadband Low Observation, Wide-Range Tracing, and Backscatter Communication. Adv Sci (Weinh) 2024; 11:e2304879. [PMID: 38342632 PMCID: PMC11022728 DOI: 10.1002/advs.202304879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 01/25/2024] [Indexed: 02/13/2024]
Abstract
In the current prevalent complex electromagnetic (EM) environment, intelligent methods for versatile and integrated control of EM waves using compact devices are both essential and challenging. These varied wave control objectives can at times conflict with one another, such as the need for broad absorption to remain inconspicuous, while also requiring enhanced backward scattering for highly reliable tracing and secure communication. To address these sophisticated challenges, a microwave-frequency reconfigurable tri-mode metasurface (RTMM) is introduced. The proposed innovation enables three distinct operational modes: broadband low observation, enhanced EM wave tracing, and backscatter communication over a wide-angle range by simple control of the PIN diodes embedded in each meta-atom. The proof-of-concept demonstration of the fabricated prototype verified the switchable tri-mode performance of the RTMM. This proposed RTMM can be adapted to various applications, including EM shielding, target detection, and secure communication in complex and threatening EM environments, paving the way for environmentally-adaptive EM wave manipulation.
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Affiliation(s)
- Jing Ning
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
| | - Yilin Zheng
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
| | - Shaojie Wang
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
| | - Tian Jiang
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
| | - Junming Zhao
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
| | - Ke Chen
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
| | - Yijun Feng
- Department of Electronic EngineeringSchool of Electronic Science and EngineeringNanjing UniversityNanjing210023China
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Li Y, Xiong C, Zhou Q, Yang W, Yang R. Thermal Contact Response of a Transversely Isotropic Magneto-Electro-Elastic Coating. Materials (Basel) 2023; 17:128. [PMID: 38203982 PMCID: PMC10779561 DOI: 10.3390/ma17010128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 12/02/2023] [Accepted: 12/07/2023] [Indexed: 01/12/2024]
Abstract
The magneto-electro-elastic (MEE) medium is a typical intelligent material with promising application prospects in sensors and transducers, whose thermal contact response is responsible for their sensitivity and stability. An effective thermal contact model between a moving sphere and a coated MEE medium with transverse isotropy is established via a semi-analytical method (SAM) to explore its thermal contact response. First, a group of frequency response functions for the magneto-electro-thermo-elastic field of a coated medium are derived, assuming that the coating is perfectly bonded to the substrate. Then, with the aid of the discrete convolution-fast Fourier transform algorithm and conjugate gradient method, the contact pressure and heat flux can be determined. Subsequently, the induced elastic, thermal, electric and magnetic fields in the coating and substrate can be obtained via influence coefficients relating the induced field and external loads. With the proposed method, parametric studies on the influence of the sliding velocity and coating property are conducted to investigate the thermal contact behavior and resulting field responses of the MEE material. The sliding velocity and thermal properties of the coating have a significant effect on the thermal contact response of the MEE material; the coupled multi-field response can be controlled by changing the coating thickness between ~0.1 a0 and a0.
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Affiliation(s)
- Yutang Li
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;
- School of Mechanical Engineering, Sichuan University, Chengdu 610065, China;
- Sichuan Aerospace Changzheng Equipment Manufacturing Co., Ltd., Chengdu 610100, China
| | - Cenbo Xiong
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;
| | - Qinghua Zhou
- School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China;
| | - Wanyou Yang
- School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, China;
| | - Rongsong Yang
- School of Mechanical Engineering, Sichuan University, Chengdu 610065, China;
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Hu S, Xiao S, Yang J, Zhang Z, Zhang K, Zhu Y, Zhang Y. AUV Path Planning Considering Ocean Current Disturbance Based on Cloud Desktop Technology. Sensors (Basel) 2023; 23:7510. [PMID: 37687967 PMCID: PMC10490685 DOI: 10.3390/s23177510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 08/11/2023] [Accepted: 08/28/2023] [Indexed: 09/10/2023]
Abstract
In the field of ocean energy detection, Autonomous Underwater Vehicles (AUVs) offer significant advantages in terms of manpower, resource, and energy efficiency. However, the unpredictable nature of the ocean environment, particularly the real-time changes in ocean currents, poses navigational risks for AUVs. Therefore, effective path planning in dynamic environments is crucial for AUVs to perform specific tasks. This paper addresses the static path planning problem and proposes a model called the noise net double DQN network with prioritized experience replay (N-DDQNP). The N-DDQNP model combines a noise network and a prioritized experience replay mechanism to address the limited exploration and slow convergence speed issues of the DQN algorithm, which are caused by the greedy strategy and uniform sampling mechanism. The proposed approach involves constructing a double DQN network with a priority experience replay and an exploration mechanism using the noise network. Second, a compound reward function is formulated to take into account ocean current, distance, and safety factors, ensuring prompt feedback during the training process. Regarding the ocean current, the reward function is designed based on the angle between the current direction and the AUV's heading direction, considering its impact on the AUV's speed. As for the distance factor, the reward is determined by the Euclidean distance between the current position and the target point. Furthermore, the safety factor considers whether the AUV may collide with obstacles. By incorporating these three factors, the compound reward function is established. To evaluate the performance of the N-DDQNP model, experiments were conducted using real ocean data in various complex ocean environments. The results demonstrate that the path planning time of the N-DDQNP model outperforms other algorithms in different ocean current scenarios and obstacle environments. Furthermore, a user console-AUV connection has been established using spice cloud desktop technology. The cloud desktop architecture enables intuitive observation of the AUV's navigation posture and the surrounding marine environment, facilitating safer and more efficient underwater exploration and marine resource detection tasks.
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Affiliation(s)
- Siyuan Hu
- School of Futrue Technology, Tianjin University, Tianjin 300072, China;
| | - Shuai Xiao
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (J.Y.); (Y.Z.)
| | - Jiachen Yang
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (J.Y.); (Y.Z.)
| | - Zuochen Zhang
- Tianjin Zhuo Lang Technology Development Co., Ltd., Tianjin 300131, China; (Z.Z.); (K.Z.)
| | - Kunyu Zhang
- Tianjin Zhuo Lang Technology Development Co., Ltd., Tianjin 300131, China; (Z.Z.); (K.Z.)
| | - Yong Zhu
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (J.Y.); (Y.Z.)
- Tianjin Institute of Software Engineering, Tianjin 300387, China;
| | - Yubo Zhang
- Tianjin Institute of Software Engineering, Tianjin 300387, China;
- School of Software, Tiangong University, Tianjin 300387, China
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Wang J, Wang Y, Xiaohalati X, Su Q, Liu J, Cai B, Yang W, Wang Z, Wang L. A Bioinspired Manganese-Organic Framework Ameliorates Ischemic Stroke through its Intrinsic Nanozyme Activity and Upregulating Endogenous Antioxidant Enzymes. Adv Sci (Weinh) 2023:e2206854. [PMID: 37129343 PMCID: PMC10369237 DOI: 10.1002/advs.202206854] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 03/21/2023] [Indexed: 05/03/2023]
Abstract
Following stroke, oxidative stress induced by reactive oxygen species (ROS) aggravates neuronal damage and enlarges ischemic penumbra, which is devastating to stroke patients. Nanozyme-based antioxidants are emerging to treat stroke through scavenging excessive ROS. However, most of nanozymes cannot efficiently scavenge ROS in neuronal cytosol and mitochondria, due to low-uptake abilities of neurons and barriers of organelle membranes, significantly limiting nanozymes' neuroprotective effects. To overcome this limitation, a manganese-organic framework modified with polydopamine (pDA-MNOF), capable of not only mimicking catalytic activities of natural SOD2's catalytic domain but also upregulating two endogenous antioxidant enzymes in neurons is fabricated. With such a dual anti-ROS effect, this nanozyme robustly decreases cellular ROS and effectively protects them from ROS-induced injury. STAT-3 signaling is found to play a vital role in pDA-MNOF activating the two antioxidant enzymes, HO1 and SOD2. In vivo pDA-MNOF treatment significantly improves the survival of middle cerebral artery occlusion (MCAo) mice by reducing infarct volume and more importantly, promotes animal behavioral recovery. Further, pDA-MNOF activates vascular endothelial growth factor expression, a downstream target of STAT3 signaling, thus enhancing angiogenesis. Taken together, the biochemical, cell-biological, and animal-level behavioral data demonstrate the potentiality of pDA-MNOF as a dual ROS-scavenging agent for stroke treatment.
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Affiliation(s)
- Jian Wang
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Yang Wang
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Xiakeerzhati Xiaohalati
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Qiangfei Su
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Jingwei Liu
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Bo Cai
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Wen Yang
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Zheng Wang
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
- Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
| | - Lin Wang
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
- Hubei Key Laboratory of Regenerative Medicine and Multi-disciplinary Translational Research, Research Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, P. R. China
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Sha Y, Liu W, Li Y, Cao W. Formation Mechanism of Skin-Core Chemical Structure within Stabilized Polyacrylonitrile Monofilaments. Nanoscale Res Lett 2019; 14:93. [PMID: 30868411 PMCID: PMC6419634 DOI: 10.1186/s11671-019-2926-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Accepted: 03/06/2019] [Indexed: 06/09/2023]
Abstract
Although it has been half a century since polyacrylonitrile (PAN)-based carbon fibers were first developed, the exact formation mechanism of skin-core structure of PAN-based carbon fibers, especially the stabilized PAN fibers, was still not well clarified from the viewpoint of the chemical structure. In order to address this aforementioned challenge, a powerful tool with nanoscale resolution named photo-induced force microscopy was applied to map the chemical group distribution in the cross section of stabilized PAN fibers and reveal the evolution mechanism of skin-core structure throughout the whole stabilization process. The results indicated that the formation of skin-core structure of stabilized PAN fiber was attributed to the complex and overlapped chemical reactions caused by gradient of oxygen along radial direction and the formation of dense crystal layer at the interface between the skin and core part. Finally, the crystal layer was destroyed and the monofilaments tended to be homogeneous with further oxidation.
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Affiliation(s)
- Yang Sha
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029 China
| | - Wei Liu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029 China
| | - Yue Li
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029 China
| | - Weiyu Cao
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029 China
- The Key Laboratory of Education Ministry on Carbon Fiber and Functional Polymer, Beijing University of Chemical Technology, Beijing, 100029 China
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