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Li Liangliang,Zhang Yanan,Chen Yang,Guo Yi,Wang Yinghui,Hu Gengwang,Kang Chengtao,Jiangfeng Wang,Wang Yu 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Sarcophaga peregrina Robineau-Desvoidy, 1830 (Diptera: Sarcophagidae) is a widely distributed species in the Palearctic, Oriental and Australian regions. Numerous studies and case reports have confirmed the value of this species in forensic investigations, but methods for estimating the age of the intrapuparial period of this species are lacking. In this study, S. peregrina pupae were sampled at 16 ◦ C, 19 ◦ C, 22 ◦ C, 25 ◦ C, 28 ◦ C, 31 ◦ C, and 34 ◦ C. Morphological changes within the puparium were observed under a stereomicroscope. The results of the study showed that S. peregrina could complete its intrapuparial development at each of the seven tested constant temperatures. As the temperature increased, the average minimum duration of the intrapuparial period of S. peregrina decreased from 706.7 ± 28.1 h at 16 ◦ C to 170.7 ± 4.6 h at 34 ◦ C. The intrapuparial morphological changes of S. peregrina can be divided into 12 sub-stages. While some structures such as the compound eyes, mouthparts, antennae, thorax, legs, wings, and abdomen can be used individually to estimate intrapuparial age, we observed all these structures with local magnification photographs and classified the developmental process of these structures into 6–11 stages. The time range for the appearance of each sub-stage or structure was recorded in detail. The results of this study provide important basic data for estimating the minimum postmortem interval using the intrapuparial morphology of S. peregrina.
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Erosion-corrosion behaviors of Z2CN19·10N austenitic stainless steel in liquid–solid two-phase flow
Wu Xiangfeng,Li Chengtao,Luo Kunjie,Fang Kewei,Qiao Yanxin 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.4
The erosion-corrosion behaviors of Z2CN19·10N austenitic stainless steel in a 3.5-wt% NaCl solution with various sediment contents (7 wt%, 10 wt%, 20 wt%) and flow rates (1 m/s, 3 m/s, 5 m/s) were studied using a rotary disk erosion-corrosion test device, scanning election microscopy (SEM), potentiodynamic polarization test and potentiostatic polarization test. The results showed that sediment concentration had a smaller influence on the electrochemical corrosion behavior of Z2CN19·10N stainless steel than the flow rate and that the flow rate mainly affected the pitting potential and passivation range, but it had little influence on the potential-constant polarization. When the erosion velocity was lower than 5 m/s, mechanical erosion was the main influencing factor, and no critical flow velocities appeared.
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