• 제목/요약/키워드: Engineering College

검색결과 25,706건 처리시간 0.053초

Discarded Egg Yolk as an Alternate Source of Poly(3-Hydroxybutyrate-co-3-Hydroxyhexanoate)

  • Hong, Yun-Gi;Moon, Yu-Mi;Hong, Ju-Won;Choi, Tae-Rim;Jung, Hye-Rim;Yang, Soo-Yeon;Jang, Dae-Won;Park, Ye-Rim;Brigham, Christopher J.;Kim, Jae-Seok;Lee, Yoo-Kyung;Yang, Yung-Hun
    • Journal of Microbiology and Biotechnology
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    • 제29권3호
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    • pp.382-391
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    • 2019
  • Many poultry eggs are discarded worldwide because of infection (i.e., avian flu) or presence of high levels of pesticides. The possibility of adopting egg yolk as a source material to produce polyhydroxyalkanoate (PHA) biopolymer was examined in this study. Cupriavidus necator Re2133/pCB81 was used for the production of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) or poly(3HHx), a polymer that would normally require long-chain fatty acids as carbon feedstocks for the incorporation of 3HHx monomers. The optimal medium contained 5% egg yolk oil and ammonium nitrate as a nitrogen source, with a carbon/nitrogen (C/N) ratio of 20. Time course monitoring using the optimized medium was conducted for 5 days. Biomass production was 13.1 g/l, with 43.7% co-polymer content. Comparison with other studies using plant oils and the current study using egg yolk oil revealed similar polymer yields. Thus, discarded egg yolks could be a potential source of PHA.

Use of rotating disk for Darcy-Forchheimer flow of nanofluid; Similarity transformation through porous media

  • Hussain, Muzamal;Sharif, Humaira;Khadimallah, Mohamed Amine;Ayed, Hamdi;Banoqitah, Essam Mohammed;Loukil, Hassen;Ali, Imam;Mahmoud, S.R.;Tounsi, Abdelouahed
    • Computers and Concrete
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    • 제30권1호
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    • pp.1-8
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    • 2022
  • The basic purpose of the current study is to compute the numerical analysis of heat source/sink for Darcy-Forchheimer three dimensional nanofluid flow with gyrotactic microorganism by rotatable disk via porous media under the slip conditions. Due to nanoparticles, random and thermophoretic motion phenomenon occurs. The governing mathematical model is handled numerically by shooting method. Additionally, the characteristics of velocities, mass, heat, motile microorganisms and associated parameters are thoroughly analyzed via plots and tables. Different physical parameters like Forchheimer number, slip parameters like velocity, porosity parameter, Prandtl number, Brownian number, thermophoresis parameter, heat sink/source parameter, bioconvected Rayleigh number, buoyancy parameteron dimensionless velocities, temperature. Approximate values of Sherwood microorganism are analyzed.

국내외 공과대학들의 교육목표 분석 (Analysis of the Education Objectives of Domestic and Foreign Colleges of Engineering)

  • 정은수;서종욱;이재호;이윤미;윤순종;김병주;정준기;한병기;정귀영
    • 공학교육연구
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    • 제11권3호
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    • pp.44-53
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    • 2008
  • 국내 대학과 외국대학의 공과대학들이 설정하고 있는 교육목표들의 현황과 특징을 살펴보았다. 대부분의 국내 공과대학들이 능력을 갖춘 인력 배출, 엔지니어로서의 기본 자질 교육, 높은 수준의 교육환경 실현을 목표로 설정하고 있다. 많은 외국 공과대학들은 "리더십"과 "진취성"에 많은 비중을 두고 있고, "창의성"과 "전문성"을 그리고 "봉사"를 강조하고 있는 추세이다. 외국과 국내 공과대학 교육목표는 특징이나 강조점에서 유사한 점이 많았다. 이들 교육목표에 대한 자료들은 장차 공과대학들이 지향하는 방향을 검토하는데 기초 자료가 될 수 있을 것이다.