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- 저자 : Wenbo Zeng (검색결과 3 건)
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Monitoring for Damage in Two-Dimensional Pre-Stress Scratching of SiC Ceramics
Gaofeng Zhang,Yijiang Zeng,Wenbo Zhang,Houming Zhou,Zhangya Wen,Yuan Yao 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
This paper reports an approach to use the acoustic emission (AE) technology for monitoring the surface/subsurface damage in twodimensional pre-stress scratching of SiC ceramics, in which the two-dimensional pre-stress is used to decrease the scratch-induced damage. Experiments in this study were conducted on a UMT-2 machine (CETR USA) utilizing a designed pre-stressing device under pressures of 0 MPa, 300 MPa and 500 MPa. The experimental results demonstrate that average frequency and magnitude of AE signals have a good correlation with the scratching tangential force and the scratch-induced surface /subsurface damage of materials. For a given normal load, the average frequency and magnitude of AE signals are observed to decrease with the increase in pre-stress, which indicates that surface/subsurface damage of SiC ceramics induced by two-dimensional pre-stress scratching is less than that induced by conventional scratching. The findings provide fundamental information for developing a practical on-line AE monitoring system that is effective in detecting surface/subsurface damage in scratching or grinding of ceramics. These results also demonstrate that two-dimensional pre-stress method contributes to decreasing the machining damage of brittle materials.
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Zhang Tao,Zhi Junrui,Liu Yong,Yue Wenbo,Zeng Guang 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Calcium ion (Ca 2+ ) plays an important role in plant–insect interactions. Ethylene glycol-bis(2-aminoethylether)-N, N, N ′ , N ′ -tetraacetic acid (EGTA), a Ca 2+ chelator, can abolish Ca 2+ in plant cells following the disruption of plant physiological processes and the plant’s defense responses against biotic stress. To clarify whether EGTA pretreatment plants have an inhibitory effect on insect feeding induction, we determined variations in kidney bean (Phaseolus vulgaris (L., Fabales: Fabaceae)) plant defense responses induced by western flower thrips (WFT) (Frankliniella occidentalis (Pergande)) feeding and the reversal effects of EGTA. The results showed that WFT feeding can significantly activate the expression level of the jasmonic acid (JA) pathway marker genes allene oxide synthase (AOS) and lipoxygenase (LOX) and salicylic acid (SA) pathway marker genes phenylalanine ammonia lyase (PAL) and β-1,3 glucanase (PR-2), and induce the biosynthesis of JA and SA. However, pre treatment with EGTA showed varying degrees of reversal effects on JA and SA content and related gene expression levels with WFT feeding. These results indicate that WFT feeding can induce the biosynthesis of JA and SA and the expression of related genes to enhance the defense responses in kidney beans plants, while pretreatment with EGTA can attenuate the WFT-induced defense responses.
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NUMERICAL PROJECTION ON OCCUPANT THERMAL COMFORT VIA DYNAMIC RESPONSES TO HUMAN THERMOREGULATION
Weijian Li,Jiqing Chen,Fengchong Lan,Xijiao Zheng,Wenbo Zeng 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
With the different physiological properties and thermal conditions, different body parts of passengers have inconsistent thermal sensations and thermal requirements in a highly non-uniform and transient vehicle cabin thermal environment. Determining the thermal comfort requirements for different body parts of a passenger is essential for effectively supplying warm air to the right human part especially for electric vehicles with energy-saving attributes. In this paper, a comprehensive numerical model that integrates human thermal regulation mechanism and dynamic environmental characteristics is established to calculate the thermal comfort for passengers via thermal responses to a dynamic environment. The numerical computation sets up such a model structure, firstly considering human thermal regulation functions into the thermal response to the in-cabin dynamic thermal distributions, then combining Berkeley thermal comfort model to identify the thermal comfort level at different body parts, that would implement total numerical simulations to get thermal comfort evaluation, independent of human subjective feedbacks. The model is validated by experiments with an acceptable error and implemented for a cabin heating case study. The models can effectively predict the thermal comfort and thermal requirements of various body parts in a dynamic environment with human thermoregulation, as an important tool for designing a non-uniform environment.
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