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RISS 인기검색어
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- 저자 : ( Yongyu Li ) (검색결과 5 건)
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Yugong Dang,Yongyu Yao,Xiaozhong Deng,Genggeng Li,Chuang Jiang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
Special cold rotary forging method for the fabrication of the big wheels of hypoid gears is proposed. The proposed method is established on the basis of the requirements of antifatigue manufacturing processes and the tooth profile characteristics of hypoid gears combined with the movement and forming methods of cold rotary forging. The geometric grid model is constructed on the basis of the basic theory of elastic-plastic thermo-mechanical coupling finite element for metal. Reasonable process parameters and boundary conditions are established. Thus, the cold rotary forging finite element model is built. The springback tooth surface is reconstructed through the results of finite element numerical simulation. The size and distribution of the springback error is the detected. In the springback process, a large displacement and large rotation can occur, so a comprehensive displacement compensation algorithm is adopted to modify the rotary forging die, and a springback error compensation iteration system is constructed based on the modified algorithm. In the case of a camion driving axle gear, the correction of the rotary forging die is analyzed. Results show that the error is already within the allowed range through only three iterations, which proves the efficiency of the system. The modified die is used for machining experiments. The measurement results of the experiment gear are consistent with the simulation results, which proves the reliability of the system. The LTCA of the gear further proves its reliability in compensating for springback error using numerical simulation technique.
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The effect of chlorfenapyr exposure on Solenopsis invicta Buren (Hymenoptera: Formicidae)
Liang Yuling,Liang Mingrong,Li Panpan,Song Yunbo,Lu Yongyue 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Red imported fire ant (RIFA), Solenopsis invicta Buren, pose a serious risk to the agriculture, environment, and public health in areas invaded by this species. Chemical insecticides have been widely used to prevent and control this plaguing pest. To discover a novel and cost-effective compound for controlling fire ants, we examined the toxic effect of chlorfenapyr on fire ants. While chlorfenapyr exhibited an insufficient horizontal toxicity transfer and knockdown effect to fire ants, feeding with chlorfenapyr solution increased fire ant workers’ gathering abilities while decreasing their walking, climbing, and adhesion ability. The mortalities of the small, medium, and large-size workers were 84.17%, 98.75%, and 82.08%, respectively, after 72 h of treatment with 25, 50, and 200 μg/ml chlorfenapyr. Additionally, females and males exhibited more higher tolerance than workers to chlorfenapyr; meanwhile, females showed a higher resistance than males. That is, the mortality of males was 100% after 120 h of treatment with 6.25 μg/ml chlorfenapyr. In contrast, the mortality of females was 79.05% after 144 h of treatment with 100 μg/ml chlorfenapyr. In addition, the chlorfenapyr bait exhibited significant toxicity on fire ants. Treated with 0.01% chlorfenapyr bait showed a better toxic effect than 0.025% during the period of 2 d-7 d. However, the weight of ant corpses was 1.32 and 1.23 g at 12 d of treatment with 0.025% and 0.01% chlorfenapyr bait, respectively. The present research showed that chlorfenapyr appeared to be an effectively potential toxic compound for developing bait to manage S. invicta.
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Yan Sun,Kai-Min Shao,Yongyue Lu,Qun-Hui Shi,Wen-Kai Wang,Li Chen 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2
The red imported fire ant, Solenopsis invicta produces an alarm pheromone component, 2-ethyl-3,6- dimethylpyrazine, and responds to its pyrazine analogs in a similar manner but at varied detection thresholds. Herein, the responses of fire ant workers by electroantennogram (EAG) and behavior were tested with twelve structurally-related oxygen-containing pyrazines (alkoxypyrazines) and the synthetic alarm pheromone. All tested compounds elicited a dose-dependent EAG response, with S. invicta responding greatest to the synthetic alarmpheromone. Chemical structure of pyrazines influenced the EAG response but not always alarmbehavioral response. Among the 13 tested compounds, 7 compounds displayed significantly greater EAG response than 2- isopropyl-3-methoxypyrazine and 2-ethoxy-3-isopropylpyrazine at the dose of 1000 μg. Four of these 7 compounds, 2-ethyl-3,6-dimethylpyrazine, 2-methoxy-3-methylpyrazine, 2-ethoxy-3(5 or 6)-methylpyrazine, and 2-chloro-3-methoxypyrazinewith characteristic substituents on pyrazine ringwere further subjected to bait discovery bioassay.Hotdog bait containing pyrazines attracted significantlymore fire antworkers in the first 15-min period, resulting in quicker recruitment to food block than hexane control. The potential of using alkoxypyrazines in fire ant control is discussed.
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( Liaoyuan Zhang ),( Zewang Guo ),( Huifang Gao ),( Xiaoqian Peng ),( Yongyu Li ),( Shujing Sun ),( Jung-kul Lee ),( Wenxiong Lin ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.12
Many plant-pathogenic bacteria are dependent on quorum sensing (QS) to evoke disease. In this study, the population of QS and quorum quenching (QQ) bacteria was analyzed in a consecutive monoculture system of Pseudostellaria heterophylla. The isolated QS strains were identified as Serratia marcescens with SwrIR-type QS system and exhibited a significant increase over the years of monoculture. Only one QQ strain was isolated from newly planted soil sample and was identified as Bacillus thuringiensis, which secreted lactonase to degrade QS signal molecules. Inoculation of S. marcescens to P. heterophylla root could rapidly cause wilt disease, which was alleviated by B. thuringiensis. Furthermore, the expression of lactonase encoded by the aiiA gene in S. marcescens resulted in reduction of its pathogenicity, implying that the toxic effect of S. marcescens on the seedlings was QS-regulated. Meanwhile, excess lactonase in S. marcescens led to reduction in antibacterial substances, exoenzymes, and swarming motility, which might contribute to pathogensis on the seedlings. Root exudates and root tuber extracts of P. heterophylla significantly promoted the growth of S. marcescens, whereas a slight increase of B. thuringiensis was observed in both samples. These results demonstrated that QS-regulated behaviors in S. marcescens mediated by root exudates played an important role in replanting diseases of P. heterophylla.
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