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Hu Changxiong,Li Yiru,Chen Guohua,Duan Pan,Wu Daohui,Liu Qing,Yin Honghui,Xu Tianyang,Zhang Xiaoming 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3
Frankliniella occidentalis Pergrande is important invasive pests in China, causing damage to agricultural pro duction, and Orius similis Zheng is the dominant predator species of F. occidentalis. A two-year survey was conducted to determine the population density of F. occidentalis and O. similis, on chili (Capsicum annuum L.) and maize (Zea mays L.) crops and surrounding weed species, which included white clover (Trifolium repens L.), St. John’s wort (Hypericum beanii N. Robson), alfalfa (Medicago sativa L.) and beggarticks (Bidens pilosa L.) in Kunming, southern China. The activity of F. occidentalis on these 6 host plant species was determined using the quartile method. F. occidentalis mainly damaged plants during their flowering stage. The main activity period of F. occidentalis occurred earlier on H. beanii and T. repens than on C. annuum. The peak activity of F. occidentalis occurred in the middle of May (on T. repens). During the whole activity period, the highest thrips densities were recorded on H. beanii among all of the sampled host plant species, followed by C. annuum. The lowest density was recorded on B. pilosa. Dynamics of immature F. occidentalis were more irregular than that of adults. The highest density of O. similis was recorded on Z. mays. It was 2.27–26.43-fold (2017) and 2.01–19.09-fold (2018) higher than that on other host plant species. This study showed that F. occidentalis could migrate between C. annuum and surrounding weeds. The weeds were the main source of thrips on C. annuum. The results indicated that Z. mays can be planted around C. annuum fields as a potential banker plant, to attract O. similis to control F. occidentalis on C. annuum, T. repens and B. pilosa. The flowering period of plants and surrounding plant species has a great effect to the population activities of F. occidentalis and predator O. similis on crops.
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Valveless Piezoelectric Micropump of Parallel Double Chambers
Li Guo,Weiping Yan,Yinghua Xu,Yiru Chen 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
The driving performance of the piezoelectric actuator was simulated by ANSYS software, and the relationship between structure parameters and center displacement/frequency of piezoelectric actuator were obtained. The nozzle/diffuser pipes’structure parameters were optimized according to the results of ANSYS numerical simulation, and flow characteristic parameters such as flow rate and pressure distribution in the pipe were researched. The chamber was manufactured on glass, and nozzle/diffuser pipes were fabricated on <100> silicon by selective-wet etch using MEMS technology. These two components were glued with piezoelectric actuator together to form micropumps with single chamber and micropumps with parallel double chambers. The flow rates of micropumps in different conditions were measured by test system. Finally, a comparison between the test results of micropump with double chambers and that of the single chamber micropump is given.
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Zhang, Yumiao,Hong, Hao,Sun, Boyang,Carter, Kevin,Qin, Yiru,Wei,Wang, Depeng,Jeon, Mansik,Geng, Jumin,Nickles, Robert J.,Chen, Guanying,Prasad, Paras N.,Kim, Chulhong,Xia, Jun,Cai, Weibo,Lovell, Jonat The Royal Society of Chemistry 2017 Nanoscale Vol.9 No.10
<P>Surfactant-stripped, nanoformulated naphthalocyanines (nanonaps) can be formed with Pluronic F127 and low temperature membrane processing, resulting in dispersed frozen micelles with extreme contrast in the near infrared region. Here, we demonstrate that nanonaps can be used for multifunctional cancer theranostics. This includes lymphatic mapping and whole tumor photoacoustic imaging following intradermal or intravenous injection in rodents. Without further modification, pre-formed nanonaps were used for positron emission tomography and passively accumulated in subcutaneous murine tumors. Because the nanonaps used absorb light beyond the visible range, a topical upconversion skin cream was developed for anti-tumor photothermal therapy with laser placement that can be guided by the naked eye.</P>
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