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RISS 인기검색어
- 검색키워드
- 저자 : Deping Zhang (검색결과 4 건)
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( Yuying Wang ),( Xue Yan ),( Weiwei Zhang ),( Yuanyuan Liu ),( Deping Han ),( Kedao Teng ),( Yunfei Ma ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.6
Farm animals such as piglets are often affected by environmental stress, which can disturb the gut ecosystem. Antibiotics were commonly used to prevent diarrhea in weaned piglets, but this was banned by the European Union due to the development of antibiotic resistance. However, the use of probiotics instead of antibiotics may reduce the risk posed by pathogenic microorganisms and reduce the incidence of gastrointestinal diseases. Therefore, this study was conducted to investigate the effects of Lactobacillus casei Zhang on the mechanical barrier and immune function of early-weaned piglets infected using Escherichia coli K88 based on histomorphology and immunology. Fourteen-day-old weaned piglets were divided into a control group and experimental groups that were fed L. casei Zhang and infected with E. coli K88 with or without prefeeding and/or postfeeding of L. casei Zhang. The L. casei Zhang dose used was 107 CFU/g diet. Jejunum segments were obtained before histological, immunohistochemical, and western blot analyses were performed. In addition, the relative mRNA expression of toll receptors and cytokines was measured. Piglets fed L. casei Zhang showed significantly increased jejunum villus height, villus height-crypt depth ratio, muscle thickness, and expression of proliferating cell nuclear antigen and tight junction proteins ZO-1 and occludin. The use of L. casei Zhang effectively reduced intestinal inflammation after infection. We found that L. casei Zhang feeding prevented the jejunum damage induced by E. coli K88, suggesting that it may be a potential alternative to antibiotics for preventing diarrhea in early-weaned piglets.
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Deping Zhang,Boqiong Li,Chaojie Che,Baosheng Liu,Peng Cheng,Yali Zhao,Jinhui Zhang,Liren Cheng 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
High quality of large-sized EV31A benchmark alloy was fabricated by direct-chill casting, without significant composition segregation along its radial direction. As-cast samples show noticeable mechanical heterogeneity, such as strength decreasing but ductility increasing from the surface to the center positions of the ingot. After heat treatment, however, mechanical properties of the alloy are nearly the same in each position, indicating mechanical homogeneity, which is mainly attributed to the strengthening mechanism transition from grain-boundary hardening in as-cast samples to precipitation hardening in peak-aged samples. In addition, we found that solute hardening is the athermal strengthening which contributes more to high-temperature strength than precipitation hardening, as evidenced by lower strength loss from 25 to 250 °C in T4-treated sample than in peak-aged sample. Solute hardening effect is thermally stable and extends to high temperatures, which favors the retention of linear strain hardening by retarding dynamic recovery. This work thus provides new insight into designing heat-resistant Mg alloys and understanding mechanical heterogeneity of large-scale Mg alloy ingots.
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Fluctuation in operational energy efficiency of ships and its implications for performance appraisal
Zhang Shuang,Yuan Haichao,Sun Deping 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
This paper develops a dynamic regression model to quantify the contribution of key external factors to operational energy efficiency of ships. On this basis, kernel density estimation is applied to explore distribution patterns of fluctuations in operational performance. An empirical analysis based on these methods show that distribution of fluctuations in Energy Efficiency Operational Indicator (EEOI) is leptokurtic and fat tailed, rather than a normal one. Around 85% of fluctuations in EEOI can be jointly explained by capacity utilization and sailing speed, while the rest depend on other external factors largely beyond control. The variations in capacity utilization and sailing speed cannot be fully passed on to the energy efficiency performance of ships, due to complex interactions between various external factors. The application of the methods is demonstrated, showing a potential approach to develop a rating mechanism for use in the legally binding framework on operational energy efficiency of ships.
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Hui Zhang,Dou Wang,Cuihong Sheng,Deping Ben,Hailiang Wu,Ningtao Mao 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
In this research, the reactive radical species in photocatalytic activities of a composite photocatalyst made fromPET filaments loaded with Ag-TiO2 nanoparticles under visible light irradiation, in comparison with those of as-modifiedAg-TiO2 nanoparticles, were reported and its photocatalytic mechanism was investigated. The PET filaments were modifiedby using tetrabutyl titanate as the TiO2 precursor and silver nitrate as the dopant in a hydrothermal process. The Ag decoratedTiO2 nanoparticles were synthesized and deposited on the surfaces of PET filaments in the hydrothermal process at 120 oCfor 180 min. The morphology, phase structure, chemical binding state, and optical properties of the PET-Ag-TiO2nanoparticles composites were systemically studied by means of field emission scanning electron microscopy (FESEM), X-raydiffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL)spectroscopy, diffuse reflectance spectroscopy (DRS), and ultraviolet photoelectron spectroscopy (UPS) techniques. Thephotocatalytic activities of the PET-Ag-TiO2 nanoparticles composites were evaluated in the photodegradation of bothmethylene blue (MB) and methyl orange (MO) dyes under visible light irradiation. It was found that, unlike in the asobtainedTiO2 nanoparticles and Ag decorated TiO2 nanoparticles, the photoinduced holes (h+) were the major reactiveradical species in both PET-Ag-TiO2 composite photocatalyst and the PET filaments loaded with TiO2 nanoparticles in theMB photodegradation process. The experimental results also indicated that the PET-Ag-TiO2 nanoparticles composites led tothe improvement of the separation efficiency of photogenerated electron-hole pairs. The enhanced photocatalytic activity ofthe PET filaments coated with Ag decorated TiO2 nanoparticles was ascribed to both the incorporation of Ag nanoparticlesinto TiO2 nanoparticles and the possible infiltration of Ag/Ti nanoparticles into PET polymers. In addition, the wavelengthand intensity of monochromatic light had great influences on the photodegradation rate of dye used, which was closelycorrelated with the maximum absorption wavelength of the dye to be degraded.
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