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- 저자 : Jiapeng Tang (검색결과 4 건)
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Rapid Design Method and System Development for Aircraft Wing Structure
Tang Jiapeng,Han Jing,Luo Mingqiang 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.1
This work is mainly done by too many manual operations in the aircraft structure design process resulting in heavy workload, low efficiency and quality, non-standardized processes and procedures. A top-down associated design method employing the template parametric technology is proposed here in order to improve the quality of design and efficiency of aircraft wing structure at the preliminary design stage. The appropriate parametric tool is chosen and the rapid design system of knowledgedriven aircraft wing structure is developed. First, a skeleton model of aircraft wing structure is rapidly built up through the template encapsulated design knowledge. Associated design is then introduced to realize the association between the typical structural part and skeleton model. Finally, the related elements are referenced from skeleton model, and a typical structural part reflecting an automatic response for design changes of the upstream skeleton model is quickly constructed within the template. The rapid design system proposed and developed in this paper is able to formalize the design standardization of aircraft wing structure and thus the rapid generation of different aircraft wing structure programs and achieve the structural design knowledge reuse as well.
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Yan Ge,Jiapeng Tang,Haihong Fu,Yijun Fu,Yuan-Yuan Wu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
In this paper, a notable chitosan/poly(ethylene oxide) nanofiber mats containing tea tree oil liposomes (TOLCENs)were successfully fabricated using electrospinning process. The microstructures and morphology were characterizedby scanning electron microscopy. The porosity, fluid absorbability, water vapor permeability and mechanical properties ofnanofiber mats were also estimated by ethanol density method, gravimetric method, dish method and tensile test,respectively. Compared to the chitosan/poly(ethylene oxide) composite freeze-dried sponges containing tea tree oilliposomes, TOL-CENs had greater porosity, water absorption, breathability and better mechanical properties. In addition, thecontrolled-release properties and long-term bactericidal capability of the material were also assessed. From the analysis of therelease kinetics and mechanism, it was found that the significant decreased terpinen-4-ol concentration gradient fromliposomal surface to the outside of material was the key to the sustained terpinen-4-ol release in virtue of liposomalencapsulation. TOL-CENs exhibited long-term and more excellent microbicidal effects against Staphylococcus aureus,Escherichia coli and Candida albicans than chitosan/poly(ethylene oxide) nanofiber mats. The combination of tea tree oilliposomes and chitosan in nanofiber mats synergistically destroyed cell membrane, prevented cell adhesion and caused theirregular aggregation of cytoplasm, resulting in cell disintegration observed by transmission electron microscope. Insummary, TOL-CENs had potential application value as a long-term antimicrobial nonwoven materials.
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Jihui Yao,Jiapeng Jiao,Ruiqiang Liu,Fei Zha,Xiaojun Guo,Xiaohua Tang,Haifeng Tian,Yue Chang 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.7
To improve the dispersion of metals and to enhance the catalytic performance of SAPO-34 molecular sieves, the template-assisted method was applied to synthesize Co, Ni and Zn modified SAPO-34 molecular sieves by using palygorskite as silicon source and tetraethylammonium hydroxide as template. The metal modified SAPO-34 molecular sieves were characterized by XRD, SEM, XPS, N2-adsorption-desorption, NH3-TPD, FTIR, ICP-AES and TG. The N atoms of tetraethylammonium hydroxide exhibited the different forces to three metal ions, thus the acidity of the molecular sieves was further regulated. Compared with metal modified SAPO-34 molecular sieves prepared by impregnation, metal modified SAPO-34 molecular sieves prepared by template-assisted maintained higher surface area, bigger pore volume and better dispersion of metals. The catalytic performance of metal modified SAPO-34 molecular sieves prepared by template-assisted method in the reaction of methanol-to-olefins (MTO) was investigated in the fixed bed reactor. Under the reaction conditions that the reaction temperature was 400 oC, the reaction pressure was 0.1 MPa, the feed WHSV was 2.0 h1 and the mass of catalyst was 0.5 g, Ni modified SAPO-34 molecular sieves exhibited great methanol conversion and high selectivity to light olefins. The selectivity of light olefins reached 95.7%.
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Yuelan Yao,Hanjie Ying,Jian Xiong,Yong Chen,Jiapeng Tang 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
The process of ATP biosynthesis from adenosine catalyzed by Saccharomyces cerevisiae was studied using an efficient energy regeneration system. A fractional factorial design (2^(9-5)) was used to evaluate the effects of different components in the medium. Magnesium chloride, toluene, and acetaldehyde were found to significantly influence ATP production. The concentrations of the three factors were then optimized using central composition design and response surface analysis. Based on the second-order polynomial model obtained from the experiments, the optimal parameters were obtained as follows: adenosine 20 g/L; glucose 67 g/L; S. cerevisiae cells 250 g/L; magnesium chloride 4.37 g/L;potassium dihydrogen phosphate 67 g/L; toluene 1.40 mL/L; acetaldehyde 2.67 mL/L; pH 7.0; and temperature 37.0 ℃. Under the condition, the yield and concentration of ATP reached 97.5% and 37 g/L, respectively. The yield was nearly 10% higher than the level before optimization and the concentration increased two-fold. In addition, the utilization efficiency of energy after optimization increased nearly 6%.
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