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RISS 인기검색어
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- 저자 : Shengtao Zhang (검색결과 5 건)
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Blood amino acids profile responding to heat stress in dairy cows
Jiang Guo,Shengtao Gao,Suyu Quan,Yangdong Zhang,Dengpan Bu,Jiaqi Wang 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.1
Objective: The objective of this experiment was to investigate the effects of heat stress on milk protein and blood amino acid profile in dairy cows. Methods: Twelve dairy cows with the similar parity, days in milk and milk yield were randomly divided into two groups with six cows raised in summer and others in autumn, respectively. Constant managerial conditions and diets were maintained during the experiment. Measurements and samples for heat stress and no heat stress were obtained according to the physical alterations of the temperature-humidity index. Results: Results showed that heat stress significantly reduced the milk protein content (p<0.05). Heat stress tended to decrease milk yield (p = 0.09). Furthermore, heat stress decreased dry matter intake, the concentration of blood glucose and insulin, and glutathione peroxidase activity, while increased levels of non-esterified fatty acid and malondialdehyde (p<0.05). Additionally, the concentrations of blood Thr involved in immune response were increased under heat stress (p<0.05). The concentration of blood Ala, Glu, Asp, and Gly, associated with gluconeogenesis, were also increased under heat stress (p<0.05). However, the concentration of blood Lys that promotes milk protein synthesis was decreased under heat stress (p<0.05). Conclusion: In conclusion, this study revealed that more amino acids were required for maintenance but not for milk protein synthesis under heat stress, and the decreased availability of amino acids for milk protein synthesis may be attributed to competition of immune response and gluconeogenesis.
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Bochuan Tan,Shengtao Zhang,Wenpo Li,Xiuli Zuo,Yujie Qiang,Lihui Xu,Jiangyu Hao,Shijin Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Phenyl disulfide (PDF), 2,20-dithiodipyridine (DDP), 5,5-dithiobis(1-phenyl-1H-tetrazole) (DPT) werestudied as inhibitors for Cu in H2SO4 via electrochemical methods, surface morphology analysis andtheoretical calculations. Electrochemical experiments show that PDF, DDP and DPT can exhibit excellentcorrosion inhibition performance. Their order of corrosion inhibition is DPT > DDP > PDF. Surfacemorphology analysis supports the electrochemical results. The X-ray photoelectron spectroscopy (XPS)results show that S Cu bonds are detected in PDF, DDP and DPT, and N Cu bonds are detected in DDPand DPT. PDF, DDP and DPT adsorption on the Cu surface obey the Langmuir isotherm model. The resultsof quantum chemical calculations show that DPT has more active reaction sites than DDP and PDF. Molecular dynamics simulation results show that the order of binding energies of the three corrosioninhibitor molecules on the copper surface is DPT > DDP > PDF.
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Optimal Timing Control of Discrete-Time Linear Switched Stochastic Systems
Xiaomei Liu,Kanjian Zhang,Shumin Fei,Haikun Wei,Shengtao Li 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4
Optimal switch-time control is the study that investigates how best to switch between different modes. In this paper, we investigate the optimal switch-time control problem for discrete-time linear switched stochastic systems. In particular, under the assumption that the sequence of active subsystems is pre-specified, we focus on the problem where the objective is to minimize a cost functional defined on the states and the switching times are the only control variables. For systems with one switching time, using calculus of variations, we firstly derive the difference formulae of the cost functional with respect to the switching time, which can be directly used to find the optimal switching instant. Then, a method is presented to deal with the problem with multiple switching times case. Finally, the viability of the proposed method is illustrated through two numerical examples.
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Rasha Khalid Ahmed,Shengtao Zhang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
Conventional organic and inorganic corrosion inhibitors are noxious and hazardous to living organisms andthe environment. Therefore, the use of plant extracts as potential corrosion inhibitors for metals hasattracted considerable attention because these compounds are renewable and can have low toxicity, mainlywhen derived from edible plant species. Here, we prepared Atriplex leucoclada extract (ALE, 0–8 g/L) andtested its effectiveness as an eco-friendly copper corrosion inhibitor in 1 M HCl using severalcharacterisation techniques, such as potentiodynamic polarisation experiments at the open-circuitpotential, electrochemical impedance spectroscopy, and surface morphology. Adsorption isothermmodelling based on the Langmuir monolayer adsorption model revealed that the antioxidantflavonoidsand polyphenolic compounds in ALE adsorb on the surface of copper and act as mixed-type inhibitors toreduce copper corrosion. Notably, the use of ALE resulted in a high (91.5%) inhibition efficiency at roomtemperature. Our results demonstrate the potential of ALE as a corrosion inhibitor for copper in acidicmedia and enrich knowledge regarding the use of plant extracts as green corrosion inhibitors.
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Lei Guo,Shanhong Zhu,Shengtao Zhang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
The effect of benzalkonium chloride (BKC) on the corrosion of carbon steel in H2SO4 media has been examined by electrochemical impedance spectroscopy (EIS), polarization, weight loss, and scanning electron microscopy (SEM) methods. The results showed that the corrosion inhibition efficiency of BKC was excellent. Potentiodynamic polarization study showed that the BKC was a mixed-type inhibitor. DFT calculations were used to gain insight into the structural and electronic properties in relation to the inhibition efficiency. Molecular dynamics (MD) simulations demonstrate that chloride ion plays a significant role in the inhibition mechanism.
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