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Shao Yazhou,Ning Anqi,An Yue,Hou Zhibo,Zhou Feng,He Chuyu,Zhang Ji,Liang Junyu 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.4
Indian meal moth, Plodia interpunctella (Lepidoptera: Pyralidae), is a worldwide omnivorous pest. It is the pri mary insect pest in many economically important stored crops. The insecticidal activity of essential oils (EOs) extracted from Ajania potaninii and Ajania fruticulosa were evaluated against Plodia interpunctella. EOs obtained by hydro-distillation were analyzed by GC–MS. Fumigant toxicity testing indicated that both EOs and their main components were toxic to P. interpunctella adults. 1,8-Cineole exhibited the strongest activity, having an LC 50 of 0.86 mg/L air and being twice as active as camphor. Myrtenol was also strongly toxic to P. interpunctella adults (LC 50 0.99 mg/L air), while camphor, verbenol, borneol, and the two complete EOs exhibited lower toxicity. None of the EOs or main components exhibited significant toxicity against the larvae of P. interpunctella. This study provides evidence of the individual active substances accounting for the insecticidal activity of EOs from A. potaninii and A. fruticulosa. These EOs have potential as biological insecticides for controlling insect pest damage in stored crops.
Yun-Lai Zhou,Shiqiang Qin,Jia Hu,Yazhou Zhang,Juntao Kang 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.5
This study proposed an improved particle swarm optimization (IPSO) method ensemble with kriging model for model updating. By introducing genetic algorithm (GA) and grouping strategy together with elite selection into standard particle optimization (PSO), the IPSO is obtained. Kriging metamodel serves for predicting the structural responses to avoid complex computation via finite element model. The combination of IPSO and kriging model shall provide more accurate searching results and obtain global optimal solution for model updating compared with the PSO, Simulate Annealing PSO (SimuAPSO), BreedPSO and PSOGA. A plane truss structure and ASCE Benchmark frame structure are adopted to verify the proposed approach. The results indicated that the hybrid of kriging model and IPSO could serve for model updating effectively and efficiently. The updating results further illustrated that IPSO can provide superior convergent solutions compared with PSO, SimuAPSO, BreedPSO and PSOGA.
Yu Jiang,Ruochen Wang,Renkai Ding,Yazhou Zhou 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.1
To improve the dynamic performance of non-pneumatic tire vehicle (NPTV) and recover the suspension vibration energy, a new self-powered electromagnetic suspension actuator matching non-pneumatic tire (NPT) with passive damping is proposed. Firstly, the mathematical model of the NPTV suspension system are established based on experiments. Secondly, the key performance parameters, passive damping and rated electromagnetic thrust, of the electromagnetic actuator are optimized, and its’ specific structure is designed. Then, a hybrid control strategy is proposed. Compared with the passive suspension, the body acceleration and suspension travel of NPTV are reduced by 9.09 % and 10.45 % respectively. Additionally, the proposed actuator can compensate the consumed power to realize self-power. Finally, a bench test is carried out, which verifies the effectiveness and superiority of the designed electromagnetic suspension actuator.