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- 저자 : Shengfu Yang (검색결과 3 건)
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Developmental Stages of Akebia trifoliata Fruit Based on Volume
Hao Yang,Wei Chen,Peng Fu,Shengfu Zhong,Ju Guan,Peigao Luo 한국원예학회 2021 원예과학기술지 Vol.39 No.6
Akebia trifoliata, commonly named augmelon (means August plus melon), has been domesticating as a new artificial cultivation fruit crop in China for several years. Generally, field management measurements are severely dependent on the development dynamic of harvest organs, and therefore the study of fruit development stage of A. trifoliata is urgent in production. In this study, four cloned lines with various spindle, nephroid, pyriform and Banana-like shapes, were selected to observe fruit developmental parameters, including volume, weight, length and width from pollination to maturity. Volume rather than length or width, which can minimize the influence of fruit shape on growth stage, was finally employed as a primary parameter for dividing developmental stages. Then a Logistic model of volume growth was established according to the data of pyriform fruit, and the other three fruits were employed to the suitability of this mathematical model. The resulted showed that the growth curve of augmelon appeared typical double sigmoid shape for all four shapes fruits. Based on four inflection points of volume growth curve, the fruit development of augmelon was classified five developmental stages in the order: fast stretch (FS) stage lasting for 48 days, shape stabilization (SS) stage lasting for 30 days, tardy expansion (TE) stage lasting for 51 days, suspended expansion (SE) stage lasting for 21 days and fast expansion (FE) stage lasting for 30 days. Comprehensively, volume was an ideal growth parameter for dividing fruit developmental stage of augmelon, and five-stage growth model could be applied as reference for both gardener and scientist to refer to the fruit growth status.
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Liu Shengfu,Jin Xiaoliang,Shi Wen,Yang Huan,Zhao Rongxiang 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
The modulation’s eff ects on the stator losses have been explored by previous studies. It confi rms that the voltage vector error introduced by the PWM schemes dominants the PWM-related harmonic eddy-current loss and the PWM-related harmonic copper loss. However, the existing PWM schemes of two parallel inverter focus on the ZSCC peak reductions. They do not explore the reductions of the voltage vector error by the optimal vector sequences to suppress the stator loss. This paper aims to reduce the stator loss of the permanent magnet synchronous motor (PMSM) drive systems fed by the two parallel interleaved inverter with an optimal PWM scheme. First, this paper investigates the eff ects of the instantaneous voltage vector error, resulting from a PWM inverter, on the eddy-current loss and stator copper loss and reveals that a reduced voltage error reduces the eddy-current loss and stator copper loss. Then, this paper divides each 60° sector into six subsectors to minimize the voltage vector error, and with the proposed sector division, it further elects the optimal vector sequences for the subsectors, applying the minimum switching times per carrier period. Besides, the proposed optimal vector sequences are implemented through a simplifi ed carrier-based method. The presented analysis confi rms that the proposed PWM scheme can reduce the eddy-current loss, stator copper loss, and switching loss of the existing methods. Finally, the experimental results verify the theoretical analysis and optimal performance of the proposed modulation strategy.
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Wenqian Zhao,Richie Yang,Shengfu Yang,Kan Zhang 한국고분자학회 2023 Macromolecular Research Vol.31 No.1
We observed an unusual low polymerization temperature for the ortho-amide benzoxazine in comparison with its para-isomer. Density functional theory (DFT) calculations suggested that the intramolecular hydrogen bond between the oxazine ring and the adjacent amide softens the C–O bond, resulting in a reduced activation energy and thus a low ring-opening polymerization temperature. In addition, the polymerization kinetics of both para- and ortho-amide functional benzoxazines were investigated using the Starink method, which confirmed a relatively lower activation energy for the ortho-amide functional benzoxazine compared with its para-isomer. Our work suggests that softening chemical bonds by intramolecular hydrogen bonding may become a new strategy for the design of high-performance polybenzoxazine thermosets with low processing temperatures.
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