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Yuetao Zhao,Wenyao Yang,Yujiu Zhou,Yan Chen,Yajie Yang,Jianhua Xu,Yadong Jiang 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
The molecular weight shows great influence on dielectricand energy storage performance of poly(vinylidenefluoride) (PVDF) films and related devices. In this letter,the influences of molecular weight on the dielectric andenergy storage properties of PVDF films were studied. Ithas been found that, under a 1000 kV/cm electric field,the low-molecular-weight PVDF film presents a muchhigher energy storage efficiency as high as 80.10%,nearly three times as much as the high-molecular-weightPVDF film. Moreover, the low-molecular-weight PVDFfilm also shows high resistivity, representing an order ofmagnitude improvement over the high-molecular-weightPVDF film, which is more desirable and promising forhigh performance pulse discharge capacitor application.
Effects of transport time and feeding type on weight loss, meat quality and behavior of broilers
Fu Yajie,Yin Jingwen,Zhao Ning,Xue Ge,Zhang Runxiang,Li Jianhong,Bao Jun 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.7
Objective: The purpose of this study is to determine the optimal time of transportation of floor-feed and scatter-feed broilers. Methods: Eighty healthy Arbor Acres (AA) broilers (21-day-old, 624.4 g, male, standard error = 6.65) were selected and randomly divided into two experimental groups (floor-feed and scatter-feed), then fed for three weeks. The experiment comprised a 2×4 factorial design with 2 feed patterns (floor-feed and scatter-feed) and 4 transport periods (2, 3, 4, and 5 h), and 4 replicates of 5 broilers (54-day-old, 2243 g, standard error = 46.65) was used to compare weight loss, meat quality and behavior index of different groups. Results: It appeared that drip loss, meat color and resting behavior of experimental broilers changed as length of transportation (p<0.05), however, weight loss and pH were not significantly transformed (p>0.05). Compared with floor-feed group, broilers in scatter-feed group had lower pH at 24 hours (3 h) and different behavioral indicators (p<0.05). Especially indicators after 3 h transportation, there were obvious differences between the two feeding modes in the behavior reaction of stress events before slaughter with different transport duration (p<0.05). The fluctuation of data on resting behavior with scatter-feed was significantly higher than that of floor-feed broilers. There was no interaction between transport time and different feeding methods for index tested of our experiment (p>0.05). Conclusion: Comprehensive analysis showed that the maximum transport duration of floor-feed and scatter-feed broilers should not exceed 3 h, and scatter-feed broilers were more likely prone to fear. Objective: The purpose of this study is to determine the optimal time of transportation of floor-feed and scatter-feed broilers.Methods: Eighty healthy Arbor Acres (AA) broilers (21-day-old, 624.4 g, male, standard error = 6.65) were selected and randomly divided into two experimental groups (floor-feed and scatter-feed), then fed for three weeks. The experiment comprised a 2×4 factorial design with 2 feed patterns (floor-feed and scatter-feed) and 4 transport periods (2, 3, 4, and 5 h), and 4 replicates of 5 broilers (54-day-old, 2243 g, standard error = 46.65) was used to compare weight loss, meat quality and behavior index of different groups.Results: It appeared that drip loss, meat color and resting behavior of experimental broilers changed as length of transportation (p<0.05), however, weight loss and pH were not significantly transformed (p>0.05). Compared with floor-feed group, broilers in scatter-feed group had lower pH at 24 hours (3 h) and different behavioral indicators (p<0.05). Especially indicators after 3 h transportation, there were obvious differences between the two feeding modes in the behavior reaction of stress events before slaughter with different transport duration (p<0.05). The fluctuation of data on resting behavior with scatter-feed was significantly higher than that of floor-feed broilers. There was no interaction between transport time and different feeding methods for index tested of our experiment (p>0.05).Conclusion: Comprehensive analysis showed that the maximum transport duration of floor-feed and scatter-feed broilers should not exceed 3 h, and scatter-feed broilers were more likely prone to fear.
Fengming Qin,Yajie Li,Wenwu He,Xiaodong Zhao,Huiqin Chen 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
The aging precipitation behavior in Mn18Cr18N austenitic stainless steel was investigated at temperatures from600 °C to 900 °C. During isothermal aging treatment, the primary precipitate was Cr2N with a = 0.478 nm and c =0.444 nm, and it preferentially nucleates along initial grain boundaries and gradually grows towards the interior ofgrains in discontinuous cellular way. Meanwhile, a small amount of granular face-centred cubic M23C6 with a =1.066 nm also were observed, which mainly form along grain boundaries. The effect of these precipitates onmechanical properties of the alloy was studied. It was found that precipitates result in degeneration of the matrixhardness. Meanwhile, the SEM morphologies of aged tensile sample show that the brittle fracture predominatesduring deformation, i.e. the fracture mode transforms from intergranular fracture to transgranular fracture with theincreasing of aging time. Compared with the solution-treated sample, the strength of the aged tensile samplesslightly decreases and plasticity remarkably deteriorates.