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- 저자 : Dagang Wang (검색결과 3 건)
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Zhi-long Wang,Ming-nian Wang,Dagang Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
Convergence-confinement method (CCM) has become a common method for tunnel design due to its simplicity and practicality. The ground reaction curve (GRC), the support characteristic curve (SCC) and the longitudinal deformation profile (LDP) are all considered in this method. One of these is the LDP, which serves as a unique identifier for the location of the tunnel support. The installation point of the tunnel support is one of the most important outcomes of the method. LDP is more impacted by the reinforcement of the tunnel face. However, more existing LDP calculation methods do not consider the reinforcement of the tunnel face. A study on methods for calculating LDP considering the tunnel face reinforcement was carried out to address this constraint of CCM. Firstly, the transformation of tunnel face extrusion deformation and pre-convergence deformation at the tunnel face is realized in accordance with equivalent volume. Then a model of LDP with the tunnel face extrusion deformation as the variable was established considering the tunnel face reinforcement effect. The proposed model's accuracy is assessed in comparison with other typical models. We conclude with parametric analyses concerning the tunnel face reinforcement's effects on the point of support installation, as well as convergence deformation of the tunnel. By taking into account tunnel faces' reinforcement effects, tunnel support design can be more accurate, and the construction costs can be reduced.
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Qian Wu,Hui Wang,Juanjuan Wu,Dagang Wang,Yongli Wang,Lei Zhang,Zhiping Huang,Deyue Yu 한국식물학회 2015 Journal of Plant Biology Vol.58 No.4
The evaluation and use of endogenous soybean genes is an effective strategy to minimize the yield losses caused by insects. Allene oxide cyclase (AOC) catalyzes the most important step in the biosynthesis of jasmonate (JA), which plays a crucial role in plant defense against insects. In this study, the role of GmAOC3 in plant insect resistance was evaluated. Real-time PCR results indicate that GmAOC3 was uniquely and rapidly activated and attained peak expression in leaves after attack by the common cutworm (CCW). In insect bioassays, transgenic lines overexpressing GmAOC3 were significantly less damaged than wild-type plants, and the relative growth rate of CCW fed with leaves from transgenic lines was significantly lower than that of CCW fed with leaves from wild-type plants. Electron microscopy revealed that the density of leaf trichomes in transgenic lines overexpressing GmAOC3 was greater than that in wild-type tobacco. Several physiological and morphological indicators, including JA, phenolic content and the relative expression levels of the putrescine N-methyltransferase (PMT) and proteinase inhibitor (PI) genes, phenylalanine ammonia lyase (PAL) activity and volatile substances, increased in the transgenic plants overexpressing GmAOC3. Our findings indicate that GmAOC3 plays an important role in soybean resistance to CCW and can be used as a resource for plant breeding.
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The Application of Atmospheric Plasma for Cotton Fabric Desizing
Xuemei Wang,Hongmei Zhao,Fuxing Chen,Xin Ning,Shaojuan Chen,Qunli Guan,Shouxiang Jiang,Dagang Miao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
Production process of cotton fabric involves numerous water and chemical consumptions, causing serious energywaste and environmental problem. In this study, a waterless atmospheric plasma treatment (APT) was applied on cottonfabric to desize the starch coated in the weaving process. Plasma parameters, i.e., plasma voltage, plasma duty cycle andoxygen flow rate, are varied in order to systematically evaluate their influence on fabric physical properties such as theimpurity removal, whiteness, capillary effect, tensile strength and breaking elongation of fabric. Optimal plasma parametersfor oxygen APT were determined, with plasma voltage of 320 V, plasma duty cycle of 60 % and oxygen flow rate of 1000 l/h. The APT desizing method attained comparable fabric performances with the traditional amylase desizing method. The resultswere further supported by the scanning electron microscope (SEM) and Fourier transfer infrared spectroscopy (FTIR)investigations.
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