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  1. Article ; Online: Moving event detection from LiDAR point streams

    Huajie Wu / Yihang Li / Wei Xu / Fanze Kong / Fu Zhang

    Nature Communications, Vol 15, Iss 1, Pp 1-

    2024  Volume 14

    Abstract: Abstract In dynamic environments, robots require instantaneous detection of moving events with microseconds of latency. This task, known as moving event detection, is typically achieved using event cameras. While light detection and ranging (LiDAR) ... ...

    Abstract Abstract In dynamic environments, robots require instantaneous detection of moving events with microseconds of latency. This task, known as moving event detection, is typically achieved using event cameras. While light detection and ranging (LiDAR) sensors are essential for robots due to their dense and accurate depth measurements, their use in event detection has not been thoroughly explored. Current approaches involve accumulating LiDAR points into frames and detecting object-level motions, resulting in a latency of tens to hundreds of milliseconds. We present a different approach called M-detector, which determines if a point is moving immediately after its arrival, resulting in a point-by-point detection with a latency of just several microseconds. M-detector is designed based on occlusion principles and can be used in different environments with various types of LiDAR sensors. Our experiments demonstrate the effectiveness of M-detector on various datasets and applications, showcasing its superior accuracy, computational efficiency, detection latency, and generalization ability.
    Keywords Science ; Q
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Establishment and Numerical Analysis of Rolling Force Model Based on Dynamic Roll Gap

    Laihua Tao / Qiaoyi Wang / Huajie Wu

    Applied Sciences, Vol 13, Iss 7394, p

    2023  Volume 7394

    Abstract: Applying mathematical models and numerical methods is crucial for describing and simulating the metal cold-rolling process, wherein the accurate prediction of rolling force is an effective way to improve the quality of rolled sheets. This paper considers ...

    Abstract Applying mathematical models and numerical methods is crucial for describing and simulating the metal cold-rolling process, wherein the accurate prediction of rolling force is an effective way to improve the quality of rolled sheets. This paper considers key influencing parameters such as friction lubrication, stress, tension, and roll-flattening radius during the rolling process and establishes a calculation model for the friction coefficient and roll-flattening radius. By considering the coupling effect of the dynamic roll gap on rolling force, a rolling force model for non-steady-state friction lubrication during the rolling process is obtained. The correctness of the proposed model is verified by comparing it with industrial measurement results. The influences of the friction coefficient, stress, tension before and after rolling, and roll-flattening radius on rolling force are quantitatively studied. The results show that the rolling force increases with an increase in the friction coefficient. When the friction coefficient exceeds 0.2, the rate of increase slows down, approaching dry friction conditions. The rolling force increases linearly with stress but decreases with increasing tension before and after rolling. The rolling force model, considering the roll-flattening radius, provides numerical calculation results that are closer to an industrial measured rolling force. This work contributes to a better understanding of the mechanism behind the improvement of the cold rolling process.
    Keywords cold rolling process ; rolling force model ; dynamic roll gap ; numerical analysis ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 670
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Investigation on the Differences in the Failure Processes of the Cortical Bone under Different Loading Conditions

    Xiaofeng Dai / Ruoxun Fan / Huajie Wu / Zhengbin Jia

    Applied Bionics and Biomechanics, Vol

    2022  Volume 2022

    Abstract: Cortical bone is a transversely isotropic material, and the mechanical properties may be related to the loading direction on the osteon. Therefore, analyzing the differences in the failure processes of cortical bone under different loading conditions is ... ...

    Abstract Cortical bone is a transversely isotropic material, and the mechanical properties may be related to the loading direction on the osteon. Therefore, analyzing the differences in the failure processes of cortical bone under different loading conditions is necessary to explore the measures for reducing the incidence of fracture. In this study, to investigate the effects of different loading directions on the fracture performance in the cortical bone, a numerical method that could simultaneously simulate the failure processes in the cortical bone structure under compression and bending loads was established based on continuum damage mechanics theory. The prediction accuracy and feasibility of the numerical method were first verified by comparing with the corresponding experimental results. Then, the differences in the failure process and fracture performance of the same cortical bone structure under compression and bending loads were investigated. The simulation results indicated that for the same structure, the slip-open failure mode appeared under compression load, and the crack propagated along a certain angle to the loading direction; the tension-open failure mode appeared under bending load, and the crack propagated along the direction perpendicular to the loading direction. Meanwhile, the fracture load was greater and the fracture time was later in the compression than in the bending condition. These phenomena stated that discrepant failure processes and fracture patterns occurred in the same cortical bone structure under different loading conditions. The main reason may be related to the tension–compression asymmetry and transversely isotropic characteristics in the cortical bone material. The fracture simulations in the cortical bone under different loading conditions could improve the prediction accuracy in bone biomechanics and provide the prevention method for cortical bone damage and fracture.
    Keywords Biotechnology ; TP248.13-248.65 ; Biology (General) ; QH301-705.5
    Subject code 600
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Pollen allergens sensitization characteristics and risk factors among allergy rhinitis of children in mainland China

    Wenting Luo / Yusi Li / Lina Xu / Yongmei Yu / Jinhai Ma / Yu Wang / Yi Wang / Huajie Wu / Meng Xv / Liting Wu / Teng Zhang / Jingping Zheng / Chuangli Hao / Baoqing Sun

    Heliyon, Vol 9, Iss 4, Pp e14914- (2023)

    A multicenter study

    2023  

    Abstract: Background: No comprehensive multicenter study of sensitization patterns among patients with allergic rhinitis (AR) to various common pollen allergens was available nationwide, and risks factors of pollen-induced allergic rhinitis (PiAR) in mainland ... ...

    Abstract Background: No comprehensive multicenter study of sensitization patterns among patients with allergic rhinitis (AR) to various common pollen allergens was available nationwide, and risks factors of pollen-induced allergic rhinitis (PiAR) in mainland China was unclear. This study aimed to fill this gap. Methods: A multicenter study was performed on 736 AR patients aged below 18 from four regions of mainland China. Patients completed a standardized questionnaire asking for the environmental risk factors and AR severity, and undertook skin prick tests (SPT) with 14 common pollen allergens. Findings: Among the 736 patients, 341 patients (46.33%) suffered at least one positive pollen allergen sensitization. The positive rate of pollen allergens was significantly higher in the high-age group (Damato et al., 2007; Wang et al., 2018; Luo et al., 2016; Demoly et al., 2011; Sampson and Albergo, 1984; Li et al., 2009; Luo et al., 2021; Ziska and Beggs, 2011; Melén et al., 2020; Jensen-Jarolim, 2017; Rönmark et al., 2017; Ge et al., 2017) [6-17] than the low-age group ( ≤ 5), while no significant difference was found between the sexes. The sensitizations to pollen allergens varied widely among four geographical areas. The positive rate was higher in north China and west China than in east China, and south China had the lowest positive rate. The region of residence, ages, ethnic minorities, history of pollen exposure, the material of living room floor and material of pillow were statistically significant risks of PiAR. Interpretation: This study provides new insights into the pollen allergens sensitization characteristics in AR and the factors affecting PiAR in mainland China.
    Keywords Allergic rhinitis ; Pollen allergens sensitization ; Risk factors ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 610 ; 950
    Language English
    Publishing date 2023-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Oral administration of a mixture of probiotics protects against food allergy via induction of CD103+ dendritic cells and modulates the intestinal microbiota

    Ma, Jingyi / Juan Zhang / Qiuhong Li / Zhaoling Shi / Huajie Wu / Huiqin Zhang / Liping Tang / Ru Yi / Hui Su / Xin Sun

    Journal of functional foods. 2019 Apr., v. 55

    2019  

    Abstract: Although the prevalence of food allergies is rising, the standard of care for these allergies is suboptimal. Probiotics have been reported to regulate the allergic immune response, but the underlying mechanisms are not fully understood. In this study, we ...

    Abstract Although the prevalence of food allergies is rising, the standard of care for these allergies is suboptimal. Probiotics have been reported to regulate the allergic immune response, but the underlying mechanisms are not fully understood. In this study, we aimed to evaluate the effect of a mixture of probiotics on food allergy in an ovalbumin (OVA)-induced murine model. Treatment with the probiotics attenuated OVA-induced allergic symptoms in mice. Flow cytometry analysis showed that oral administration of probiotics induced mucosal CD103+ dendritic cells (DCs), which promoted differentiation of regulatory T cells (Tregs). 16S rRNA analysis revealed that the probiotics modulated the composition of microbiota, especially by increasing the proportion of the Deferribacteres and Verrucomicrobia phyla and the Mucispirillum and Clostridium XlVa genera, which in turn regulated the immune system. Our findings provide molecular insight into the application of a mixture of probiotics to alleviate food allergies and even gut immune homeostasis.
    Keywords Clostridium ; Mucispirillum ; T-lymphocytes ; Verrucomicrobia ; animal models ; dendritic cells ; digestive system ; flow cytometry ; food allergies ; homeostasis ; immune response ; intestinal microorganisms ; mice ; oral administration ; ovalbumin ; probiotics ; ribosomal RNA
    Language English
    Dates of publication 2019-04
    Size p. 65-75.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2511964-3
    ISSN 1756-4646
    ISSN 1756-4646
    DOI 10.1016/j.jff.2019.02.010
    Database NAL-Catalogue (AGRICOLA)

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