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Shaking Table Test of Water Supply Pipes Installed in a Full-Scale Masonry Structure
Houli Wu,Endong Guo,Dezhang Sun,Chenxi Mao,Haoyu Zhang,Zhibin Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
The seismic performance of indoor water supply pipes plays a significant role during earthquakes, and the failure of pipes causes severe economic losses and other disasters. This paper presents shaking table test research on water supply pipes installed in a full-scale masonry structure. Three different material pipes and three different material fillers were combined to evaluate the difference in seismic performance. In this study, normalized floor response spectra and pipe acceleration amplification factors obtained from experimental data were compared with code provisions. Spectrum analysis was used to evaluate the pipeline seismic response, and the results showed that the combination of pipes and fillers with similar material properties vibrated partially at multiple frequencies. In contrast, the combination of pipes and fillers with very different material properties only vibrated near the predominant structural period.
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Contact toxicity of a new acaricide, SYP-9625, to the natural predator, Chrysopa pallens
Feng Yanjiao,Zhang Lisheng,Chen Hongyin,Wang Mengqing,Liu Chenxi,Li Yuyan,Song Yuquan,Mao Jianjun 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2
SYP-9625 is a novel acaricide synthesized by using cyenopyrafen as lead compound. It is characterized by high acaricidal activity and low toxicity to mammals and has been widely used in Chinese farming areas. However, to date, the toxicity of SYP-9625 to natural enemy insects remained unclear. Here, we evaluated the effects of SYP-9625 on survival, growth, metamorphosis and reproduction of a common natural predator, Chrysopa pallens. Contact toxicity bioassay revealed that SYP-9625 had no significant detrimental impacts on egg hatchability, larval survival and duration, pupation rate, pupal mass, emergence rate, digestive enzyme activity, reproductive output and offspring quality, but drastically reduced adult survival rate, adult lifespan, secondary follicle size and vitellogenin (Vg) transcripts by 27.8%, 15.4%, 33.4% and 59.4%, respectively, suggesting a low contact toxicity of SYP-9625 to C. pallens. This study will strengthen the compatibility of chemical acaricide and natural enemy insects in integrated pest management.
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