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- 검색키워드
- 저자 : Dapeng ZHENG (검색결과 3 건)
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Research on Fixture Hole Drilling Quality of Printed Circuit Board
Xiaohu Zheng,Dapeng Dong,Lixin Huang,Qinglong An,Xibin Wang,Ming Chen 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Printed circuit board (PCB) fixture hole is used for installing PCB board or fixing PCB board during drilling process. The drilling quality parameters involve burr size, hole wall roughness et al. In order to improve drilling quality, proper drilling parameters and tool geometries are important especially the tool geometries. In this study, the drilling machinability of PCB fixture hole is studied,effects of drilling parameters on thrust force, drilling temperature and quality are discussed. The experimental results show that resin will be melted during the drilling process. The increase in spindle speed will lead to drilling temperature rise. The fuzzing and spalling of glass fibers result in the generation of hole wall roughness. The exit burrs and enter burrs are generated from drilling copper foils which located in the upper and lower surfaces. The heights of exit burrs are increased with the elevated feed. Drilling experiments are carried out with 9 drill bits which have different point angles, helix angles and length of chisel edges. Analysis of variance (ANOVA) is carried out for hole quality parameters. Desirability function method is used in multiple response optimization to obtain the optimal tool geometry parameters.
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Qing-Qing Li,JIN SHENG,Pengcheng Li,Dapeng Li,Cheng-Chao Zheng,Dequan Li,Huairui Shu 한국식물학회 2012 Journal of Plant Biology Vol.55 No.4
Alcohol acyltransferase (AAT) plays an important role in ester biogenesis in ripening fruit. In apple, MdAAT2 is up-regulated in response to treatment with defense-related hormones. We cloned a novel MdAAT2 promoter via thermal asymmetric interlaced PCR (TAIL-PCR). Sequence analysis indicated the presence of salicylic acid (SA)- and methyl jasmonate (MeJA)-responsive elements in the promoter region. To examine further the operational mechanism for transcription factors (TFs) in regulating expression of the MdAAT2 promoter, we isolated and investigated six potential stress-induced TFs -- MdMYB1, MdMYB2, MdMYB6,MdERF1, MdERF2, and WRKY. These were monitored during various stages of fruit development as well as under several hormonal treatments. Reverse transcription-polymerase chain reaction (RT-PCR) analysis showed that all of these TF genes, as well as MdAAT2, were detectable in the stigmas. Levels of expression by MdMYB1, MdMYB2, and MdERF1were significantly correlated with that by MdAAT2 during fruit ontogeny. Moreover, transcription of three TFs (MdMYB1,MdMYB6, and MdERF1) was significantly correlated with that of MdAAT2 upon exposure to ethephon, SA, or MeJA. Sequence analysis demonstrated that CAAT, CCAAT elements,and several MYB transcription factor binding sites (CNGTTmotif,AACCA, and CTAACCA elements) existed in the MdAAT2 promoter region. Using that analysis, we performed modeling of MdMYB1 and MdMYB6 based on PROTEINDNA complex1 and complex3 (PDB Accession Numbers 1H88 and 1H8A). There, similarities were found with the protein complex of CAAT or CCAAT consensus sequences. Thus, we propose that two TFs -- MdMYB1 and MdMYB6-- are directly or indirectly involved in the activation of MdAAT2 expression in apple fruit.
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Modeling and Evaluation of Inertia Emulation Control for DFIG Wind Turbine
Haoshu SHAO,Xu CAI,Jianwen Zhang,Yunfeng Cao,Fangquan RAO,Dapeng ZHENG,Dangsheng ZHOU,Yan WANG 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
With the increasing penetration of renewable energy generators in power grid, many inertia emulation control strategies have been raised to solve the problem of reduced power system inertia. A co-simulation research platform is built based on RTDS and GH Bladed, detailed comparisons are made in terms of inertia response performance, weak grid operation stability, secondary frequency drop and wind tower load analysis. Research results point out that different control schemes are similar in inertia response while virtual synchronous generator control (VSG) and inertial synchronization control (ISynC) can improve weak grid operation stability, VSG strategy is also effective in reducing frequency secondary drop and wind tower fatigue load, the combination of VSG and ISynC can get the best control results.
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