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Musen Wang,Shengyang Xu,Tianzheng Wang,Tingting Jia,Zhenzhen Xu,Xue Wang,Zhu Yu 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.12
Objective: To evaluate the effect of lactic acid bacteria and storage temperature on the microbial, chemical and mycotoxin composition of corn silage. Methods: Corn was harvested at 32.8% dry matter, and chopped to 1 to 2 cm. The chopped material was subjected to three treatments: i) control (distilled water); ii) 1×106 colony forming units (cfu)/g of Lactobacillus plantarum; iii) 1×106 cfu/g of Pediococcus pentosaceus. Treatments in triplicate were ensiled for 55 d at 20°C, 28°C, and 37°C in 1-L polythene jars following packing to a density of approximately 800 kg/m3 of fresh matter, respectively. At silo opening, microbial populations, fermentation characteristics, nutritive value and mycotoxins of corn silage were determined. Results: L. plantarum significantly increased yeast number, water soluble carbohydrates, nitrate and deoxynivalenol content, and significantly decreased the ammonia N value in corn silage compared with the control (p<0.05). P. pentosaceus significantly increased lactic acid bacteria and yeast number and content of deoxynivalenol, nivalenol, T-2 toxin and zearalenone, while decreasing mold population and content of nitrate and 3-acetyl-deoxynivalneol in corn silage when stored at 20°C compared to the control (p<0.05). Storage temperature had a significant effect on deoxynivalenol, nivalenol, ochratoxin A, and zearalenone level in corn silage (p<0.05). Conclusion: Lactobacillus plantarum and Pediococcus pentosaceus did not decrease the contents of mycotoxins or nitrate in corn silage stored at three temperatures.
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Lisa Ramage,Shengyang Qiu,Zhu Yeap,Constantinos Simillis,Christos Kontovounisios,Paris Tekkis,Emile Tan 대한대장항문학회 2019 Annals of Coloproctolgy Vol.35 No.6
Purpose: This study aims to establish the ability of patient-reported outcome measures (PROMs) and anorectal manometry (ARM) in predicting the need for surgery in patients with fecal incontinence (FI). Methods: Between 2008 and 2015, PROMs data, including the Birmingham Bowel and Urinary Symptoms Questionnaire (BBUSQ), Short Form 36 (SF-36), Wexner Incontinence Score and ARM results, were prospectively collected from 276 patients presenting with FI. Spearman rank was used to assess correlations between specific PROMs questions and ARM assessments of sphincter motor function. Binomial regression analyses were performed to identify factors predictive of the need for surgery. Finally, receiver operating characteristic (ROC) curve analyses were performed to establish the utility of individual ARM and PROMs variables in predicting the need for surgical intervention in patients with FI. Results: Two hundred twenty-eight patients (82.60%) were treated conservatively while 48 (17.39%) underwent surgery. On univariate analyses, all 4 domains of the BBUSQ, all 8 domains of the SF-36, and the Wexner Incontinence Score were significant predictors of surgery. Additionally, maximum resting pressure, 5-second squeeze endurance, threshold volume, and urge volume were significant. On ROC curve analyses, the only significant ARM measurement was the 5-second squeeze endurance. PROMs, such as the incontinence domain of the BBUSQ and five of the SF-36 domains, were identified as fair discriminators of the need for surgery. Conclusion: PROMs are reliable predictors of maximal treatment in patients with FI and can be readily used in primary care to aid surgical referrals and can be applied in hospital settings as an aid to guide surgical treatment decisions.
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Design Optimization of a Combined Shielding Structure for a High Impedance Auto-Transformer
Li Longnv,Hu Shengyang,Zhao Yishuang,Xiao Hang,Liu Tao,Xue Ming,Zhu Gaojia 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
In this paper, a combined shielding structure for the oil tank of an OSFSZ-250000KVA/220 kV transformer is proposed and optimized to reduce the magnetic flux leakage and the stray losses. Firstly, the shielding effects of the transverse and longitudinal shielding structures are studied based on three-dimensional frequency-domain nonlinear finite element method. Secondly, the combined shielding structure is proposed with copper shielding introduced at both ends of the transverse magnetic shielding to effectively reduce the magnetic flux leakage of the oil tank. Therefore, the eddy current loss in the oil tank can be significantly reduced. Finally, Taguchi method is used to optimize the structural parameters of the combination shielding to reduce both the oil tank eddy current losses and the shielding costs. The study in this paper can provide guidance for the design of large capacity power transformers, and has important engineering significance.
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Qinglie He,Yun Yang,Chengbiao Cai,Shengyang Zhu 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.1
This work elaborately investigates the influences of the guideway geometry parameters and track irregularity on the dynamic performances of the suspended monorail vehicle-guideway system (SMVGS). Firstly, a spatial dynamic analysis model of the SMVGS is established by adopting ANSYS parameter design language. Then, the dynamic interaction between a vehicle with maximum design load and guideway is investigated by numerical simulation and field tests, revealing the vehicle-guideway dynamic features. Subsequently, the influences of the guideway geometry parameters and track irregularity on the dynamic performances of the SMVGS are analyzed and discussed in detail, and the reasonable ranges of several key geometry parameters of the guideway are also obtained. Results show that the vehicle-guideway dynamic responses change nonlinearly with an increase of the guideway span, and especially the guideway dynamic performances can be effectively improved by reducing the guideway span; based on a comprehensive consideration of all performance indices of the SMVGS, the deflectionspan ratio of the suspended monorail guideway is finally recommended to be 1/1054~1/868. The train load could cause a large bending deformation of the pier, which would intensify the car-body lateral displacement and decrease the vehicle riding comfort; to well limit the bending deformation of the pier, its cross-section dimension is suggested to be more than 0.8 m×0.8 m. The addition of the track irregularity amplitude has small influences on the displacements and stress of the guideway; however, it would significantly increase the vehicle-guideway vibrations and rate of load reduction of the driving tyre.
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