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Yang Hu,Jia-An CHENG,Zengrong Zhu,Kong Luen Heong,Qiang Fu,Jiachun He 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.4
The White-backed Planthopper (WBPH), Sogatella furcifera (Horváth (Hemiptera: Delphacidae)) has been the most serious pest threatening rice production in Asia since the late 1970s. A series of field experiments using the same research protocol was carried out to compare the effects of main environmental factors on population development of WBPH in tropical (Philippines) and subtropical (China) areas in 2010–2012 and to provide further evidences of ecological mechanisms involved that cause frequent outbreak in subtropical rice. Outcomes showed that WBPH population in subtropical area could be characterized as the higher population growth rates and higher peak densities. The average growth rate (116.60 ± 46.16) in subtropical area was significantly higher than that in tropical area (24.02± 11.25). The higher realized fecundity in subtropical area indicated that the higher growth rates and higher peak densities were mainly related to the poor natural regulating forces in subtropical area. Our results showed that resistant variety could significantly reduce the peak density in subtropical areas, but not in tropical areas. We inferred that the reason for not detecting the effect of resistant variety in tropical area was due to the dominant controlling effects provided by natural enemies,which means that the natural regulating effect in tropical areawas strong enough to disguise the effects of resistant variety. The significant interactions between plant resistance and location demonstrated that integration of natural enemies and use of plant resistance could play important roles for reducing outbreak frequency of WBPH effectively in subtropical rice.
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Xiaming Chen,Xiaonan Wang,Pengchen Huan,Zengrong Hu,Zhikang Wu,Bo Zhang,Hiromi Nagaumi 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
The difference in droplet transfer behavior between the traditional cold metal transfer plus pulse (CMT + P) process and thenew CMT mix synchro-pulse (CMT + SP) process, and its effect on the overall morphology, porosity, microstructure andmechanical properties of WAAM-ed AA2219 alloy are studied. Compared to the pulse stage (fP = 160 Hz) of the traditionalCMT + P process, the pulse stage of CMT + SP process consists of the low-frequency pulse and high-frequency pulse (HFP)stages. The high frequency (fH = 200 Hz) of the HFP stages formed a high arc force, enlarging the molten pool and enhancingthe convection of molten pool. This increased the melting depth between passes and facilitated the flow of the moltenpool to the sides and escaping of the pores. As a result, a highly symmetric WAAM-ed AA2219 alloy with a high effectiveheight (14.2 mm) and effective area (89.6 mm2),and low porosity (0.6 ± 0.2%) was manufactured by the CMT + SP process. Moreover, the fine grains (61 μm) with a 43% (area fraction) equiaxed grains were obtained with the CMT + SP process,leading to more θ′ phases precipitating. Thus, the average microhardness and tensile strength of the CMT + SP samplesincreased to 80.2 ± 6.7 HV and 265.0 ± 17.0 MPa, respectively.
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Zeng, Rong,Duan, Lei,Kong, Yu-Ke,Wu, Xiao-Lu,Wang, Ya,Xin, Gang,Yang, Ke-Hu Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15
Many studies have reported ${\beta}$-catenin involvement in the development of esophageal carcinoma (EC), but its prognostic significance for EC patients remains controversial. Therefore, we conducted this meta-analysis to explore the issue in detail. After searching PubMed, EMBASE, Web of Science, and Chinese Biomedical Literature Database, we included a total of ten relevant studies. We pooled the overall survival (OS) data using RevMan 5.2 software. The results showed that aberrant expression of ${\beta}$-catenin was associated with a significant increase of mortality risk (hazard ratio 1.71, 95%CI 1.46-2.01; p<0.00001). Subgroup analyses further suggested that aberrant expression of ${\beta}$-catenin resulted in poor OS of EC patients regardless of histological type of EC, study location or criteria for aberrant expression of ${\beta}$-catenin, and the sensitivity analyses revealed that the result was robust. The meta-analysis revealed that aberrant expression of ${\beta}$-catenin could be a predicative factor of poor prognosis for EC patients.
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