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  1. Article ; Online: Design of intelligent inspection system for solder paste printing defects based on improved YOLOX.

    Kong, Defeng / Hu, Xinyu / Zhang, Junwei / Liu, Xiyang / Zhang, Daode

    iScience

    2024  Volume 27, Issue 3, Page(s) 109147

    Abstract: Aiming at the current SPI (solder paste inspection) system for printing solder paste similar defects detection accuracy is not high, the system intelligence degree is low and so on, design a for the solder paste similar defects and combined with phase ... ...

    Abstract Aiming at the current SPI (solder paste inspection) system for printing solder paste similar defects detection accuracy is not high, the system intelligence degree is low and so on, design a for the solder paste similar defects and combined with phase modulation profile measurement technique and improve the YOLOX intelligent detection system. The core of the system is the improved YOLOX depth model based on s-mosica and kt-iou algorithms proposed in this paper. The experimental results show that the proposed s-mosica and kt-iou algorithms can effectively improve the detection accuracy of printed solder paste, and when combined with the YOLOX model, the best 90.33% detection accuracy is obtained, which is better than the detection performance of the existing algorithms in the same scenario, and it provides an effective and feasible reference program for the design of the SPI high-precision intelligent detection system.
    Language English
    Publishing date 2024-02-05
    Publishing country United States
    Document type Journal Article
    ISSN 2589-0042
    ISSN (online) 2589-0042
    DOI 10.1016/j.isci.2024.109147
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Research on Inter-Frame Feature Mismatch Removal Method of VSLAM in Dynamic Scenes.

    Yang, Zhiyong / He, Yang / Zhao, Kun / Lang, Qing / Duan, Hua / Xiong, Yuhong / Zhang, Daode

    Sensors (Basel, Switzerland)

    2024  Volume 24, Issue 3

    Abstract: Visual Simultaneous Localization and Mapping (VSLAM) estimates the robot's pose in three-dimensional space by analyzing the depth variations of inter-frame feature points. Inter-frame feature point mismatches can lead to tracking failure, impacting the ... ...

    Abstract Visual Simultaneous Localization and Mapping (VSLAM) estimates the robot's pose in three-dimensional space by analyzing the depth variations of inter-frame feature points. Inter-frame feature point mismatches can lead to tracking failure, impacting the accuracy of the mobile robot's self-localization and mapping. This paper proposes a method for removing mismatches of image features in dynamic scenes in visual SLAM. First, the Grid-based Motion Statistics (GMS) method was introduced for fast coarse screening of mismatched image features. Second, an Adaptive Error Threshold RANSAC (ATRANSAC) method, determined by the internal matching rate, was proposed to improve the accuracy of removing mismatched image features in dynamic and static scenes. Third, the GMS-ATRANSAC method was tested for removing mismatched image features, and experimental results showed that GMS-ATRANSAC can remove mismatches of image features on moving objects. It achieved an average error reduction of 29.4% and 32.9% compared to RANSAC and GMS-RANSAC, with a corresponding reduction in error variance of 63.9% and 58.0%, respectively. The processing time was reduced by 78.3% and 38%, respectively. Finally, the effectiveness of inter-frame feature mismatch removal in the initialization thread of ORB-SLAM2 and the tracking thread of ORB-SLAM3 was verified for the proposed algorithm.
    Language English
    Publishing date 2024-02-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s24031007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Study on geometrical adaptiveness of pre-bend and swept coupled blades.

    Wang, Quan / Hu, Cong / Zhang, Daode / Chen, Gang / Wang, Fengyun

    Heliyon

    2022  Volume 8, Issue 11, Page(s) e11809

    Abstract: Sweep rotor blade would reduce blade fatigue load, but induce additional blade root torsional moment. This paper introduces pre-bend/sweep blade to reduce this additional torsional moment. A parameterized mathematical model is developed to define the ... ...

    Abstract Sweep rotor blade would reduce blade fatigue load, but induce additional blade root torsional moment. This paper introduces pre-bend/sweep blade to reduce this additional torsional moment. A parameterized mathematical model is developed to define the geometrical configuration of pre-bend/sweep blade with a fully curvilinear axis based on the curves theory of differential geometry. The blade's geometrical configuration is defined by a series of parameters, thus one can change these parameters to get different blades. An aeroelastic model is established based on the coupling of blade element momentum (BEM) theory and geometrically exact beam theory (GEBT). The BEM theory is implemented in an alternative way to enable it to address the spatial curved and twist blade. In order to investigate the aeroelastic behavior of pre-bend/sweep blade, three kinds of blades are built by the parametrized model and then simulated by the aeroelastic model. From the investigation, it is concluded that pre-bend/sweep blade is better than a purely swept blade for the reason that it shows better performance in reducing the blade root torsional moment as well as alleviating vibration. This paper provides a feasible approach to optimize the geometrical configuration of pre-bend/sweep blade for the purpose of adaptiveness.
    Language English
    Publishing date 2022-11-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2022.e11809
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Distribution, Source Apportionment and Risk Assessment of Polycyclic Aromatic Hydrocarbons (PAHs) in Surface Sediments at the Basin Scale: A Case Study in Taihu Basin, China

    Xie, Fazhi / Cai, Gege / Zhang, Daode / Li, Guolian / Li, Haibin / Xu, Baile / Zhang, Jiamei / Wang, Jizhong

    Bull Environ Contam Toxicol. 2023 Jan., v. 110, no. 1 p.27-27

    2023  

    Abstract: As a systematic research at basin scale, this study investigated the spatial distribution, source apportionment and ecological risks of eighteen polycyclic aromatic hydrocarbons (PAHs) in surface sediments at different functional regions (rivers, lakes ... ...

    Abstract As a systematic research at basin scale, this study investigated the spatial distribution, source apportionment and ecological risks of eighteen polycyclic aromatic hydrocarbons (PAHs) in surface sediments at different functional regions (rivers, lakes and reservoirs) from Taihu basin. Results showed that the mean values of 18 PAHs (defined as ∑₁₈PAHs) in river sediments (1277 ng/g) was much higher than those observed in lake sediments (243 ng/g) and reservoir sediments (134 ng/g). The accumulation of PAHs in river sediments was largely impacted by the local social-economic development and energy consumption. The positive matrix factorization (PMF) and isomer ratios analysis of PAHs suggest that relative contributions to PAHs in sediments were 15% for gasoline and heavy oil combustion, 9% for oil spills, 30% for coal combustion, 23% for traffic source, and 23% for diagenetic source. Ecological risk assessment based upon risk quotient (RQ) method indicated that sediments at Taihu basin have suffered moderate risk of PAHs.
    Keywords basins ; bulls ; case studies ; coal ; combustion ; energy ; environmental assessment ; gasoline ; isomers ; lakes ; oils ; relative risk ; risk assessment ; rivers ; traffic ; China
    Language English
    Dates of publication 2023-01
    Size p. 27.
    Publishing place Springer US
    Document type Article ; Online
    ZDB-ID 6895-0
    ISSN 1432-0800 ; 0007-4861
    ISSN (online) 1432-0800
    ISSN 0007-4861
    DOI 10.1007/s00128-022-03670-9
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

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  5. Article ; Online: Study on geometrical adaptiveness of pre-bend and swept coupled blades

    Wang, Quan / Hu, Cong / Zhang, Daode / Chen, Gang / Wang, Fengyun

    Heliyon. 2022 Nov., v. 8, no. 11 p.e11809-

    2022  

    Abstract: Sweep rotor blade would reduce blade fatigue load, but induce additional blade root torsional moment. This paper introduces pre-bend/sweep blade to reduce this additional torsional moment. A parameterized mathematical model is developed to define the ... ...

    Abstract Sweep rotor blade would reduce blade fatigue load, but induce additional blade root torsional moment. This paper introduces pre-bend/sweep blade to reduce this additional torsional moment. A parameterized mathematical model is developed to define the geometrical configuration of pre-bend/sweep blade with a fully curvilinear axis based on the curves theory of differential geometry. The blade's geometrical configuration is defined by a series of parameters, thus one can change these parameters to get different blades. An aeroelastic model is established based on the coupling of blade element momentum (BEM) theory and geometrically exact beam theory (GEBT). The BEM theory is implemented in an alternative way to enable it to address the spatial curved and twist blade. In order to investigate the aeroelastic behavior of pre-bend/sweep blade, three kinds of blades are built by the parametrized model and then simulated by the aeroelastic model. From the investigation, it is concluded that pre-bend/sweep blade is better than a purely swept blade for the reason that it shows better performance in reducing the blade root torsional moment as well as alleviating vibration. This paper provides a feasible approach to optimize the geometrical configuration of pre-bend/sweep blade for the purpose of adaptiveness.
    Keywords geometry ; mathematical models ; momentum ; vibration ; Geometrical adaptiveness ; Pre-bend/sweep blade ; Parameterized model ; Alternative BEM theory implementation ; Geometrically exact beam theory
    Language English
    Dates of publication 2022-11
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2022.e11809
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials.

    Li, Xiuhong / Peng, Yujie / He, Youqi / Zhang, Chupeng / Zhang, Daode / Liu, Yong

    Nanomaterials (Basel, Switzerland)

    2022  Volume 12, Issue 7

    Abstract: Noise is considered severe environmental pollutant that affects human health. Using sound absorption materials to reduce noise is a way to decrease the hazards of noise pollution. Micro/nanofibers have advantages in sound absorption due to their ... ...

    Abstract Noise is considered severe environmental pollutant that affects human health. Using sound absorption materials to reduce noise is a way to decrease the hazards of noise pollution. Micro/nanofibers have advantages in sound absorption due to their properties such as small diameter, large specific surface area, and high porosity. Electrospinning is a technology for producing micro/nanofibers, and this technology has attracted interest in the field of sound absorption. To broaden the applications of electrospun micro/nanofibers in acoustics, the present study of electrospun micro/nano fibrous materials for sound absorption is summarized. First, the factors affecting the micro/nanofibers' sound absorption properties in the process of electrospinning are presented. Through changing the materials, process parameters, and duration of electrospinning, the properties, morphologies, and thicknesses of electrospun micro/nanofibers can be controlled. Hence, the sound absorption characteristics of electrospun micro/nanofibers will be affected. Second, the studies on porous sound absorbers, combined with electrospun micro/nanofibers, are introduced. Then, the studies of electrospun micro/nanofibers in resonant sound absorption are concluded. Finally, the shortcomings of electrospun micro/nano fibrous sound absorption materials are discussed, and the future research is forecasted.
    Language English
    Publishing date 2022-03-29
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano12071123
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Book ; Online: Quantum Identity-Based Encryption from the Learning with Errors Problem

    Gao, Wenhua / Yang, Li / Zhang, DaoDe / Liu, Xia

    2021  

    Abstract: In order to prevent eavesdropping and tampering, the network security protocols use a handshake with an asymmetric cipher to establish a session-specific shared key with which further communication is encrypted using a symmetric cipher. The commonly used ...

    Abstract In order to prevent eavesdropping and tampering, the network security protocols use a handshake with an asymmetric cipher to establish a session-specific shared key with which further communication is encrypted using a symmetric cipher. The commonly used asymmetric algorithms include public key encryption, key exchange and identity-based encryption(IBE). However, the network security protocols based on classic identity-based encryption do not have perfect forward security. To solve the problem, we construct the first quantum IBE (QIBE) scheme based on the learning with errors problem, and prove that our scheme is fully secure under the random oracle. Moreover, we construct the quantum circuit of our QIBE scheme and give an estimate of the quantum resource of our circuit including the numbers of Hadamard gate, phase gate, T gate, CNOT gate and the total qubits used in the circuit, and conclude that the quantum resources required by our scheme increase linearly with the number of bits of the encrypted quantum plaintext. Our scheme exhibits the following advantages: (i) The classic key generation center (KGC) system still can be used for our QIBE scheme to generate and distribute the secret identity keys so that the cost can be reduced when the scheme is implemented. The reason why the classic KGC can be used is that the public and private keys are in the form of classic bits. (ii) The network security protocols using a handshake with our QIBE scheme can provide perfect forward security. In our scheme, the ciphertext is transmitted in the form of a quantum state that is unknown to the adversary and therefore cannot be copied and stored. Thus, in the network security protocols based on our QIBE construction, the adversary cannot decrypt the previous quantum ciphertext to threat the previous session keys even if the identity secret key is threatened.

    Comment: 10 pages,9 figures
    Keywords Computer Science - Cryptography and Security
    Subject code 303
    Publishing date 2021-09-26
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Recycling and Reutilizing Polymer Waste via Electrospun Micro/Nanofibers: A Review.

    Li, Xiuhong / Peng, Yujie / Deng, Yichen / Ye, Fangping / Zhang, Chupeng / Hu, Xinyu / Liu, Yong / Zhang, Daode

    Nanomaterials (Basel, Switzerland)

    2022  Volume 12, Issue 10

    Abstract: The accumulation of plastic waste resulting from the increasing demand for non-degradable plastics has led to a global environmental crisis. The severe environmental and economic drawbacks of inefficient, expensive, and impractical traditional waste ... ...

    Abstract The accumulation of plastic waste resulting from the increasing demand for non-degradable plastics has led to a global environmental crisis. The severe environmental and economic drawbacks of inefficient, expensive, and impractical traditional waste disposal methods, such as landfills, incineration, plastic recycling, and energy production, limit the expansion of their applications to solving the plastic waste problem. Finding novel ways to manage the large amount of disposed plastic waste is urgent. Until now, one of the most valuable strategies for the handling of plastic waste has been to reutilize the waste as raw material for the preparation of functional and high-value products. Electrospun micro/nanofibers have drawn much attention in recent years due to their advantages of small diameter, large specific area, and excellent physicochemical features. Thus, electrospinning recycled plastic waste into micro/nanofibers creates diverse opportunities to deal with the environmental issue caused by the growing accumulation of plastic waste. This paper presents a review of recycling and reutilizing polymer waste via electrospinning. Firstly, the advantages of the electrospinning approach to recycling plastic waste are summarized. Then, the studies of electrospun recycled plastic waste are concluded. Finally, the challenges and future perspectives of electrospun recycled plastic waste are provided. In conclusion, this paper aims to provide a comprehensive overview of electrospun recycled plastic waste for researchers to develop further studies.
    Language English
    Publishing date 2022-05-13
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano12101663
    Database MEDical Literature Analysis and Retrieval System OnLINE

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