• Title/Summary/Keyword: Korean song

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Rotordynamic Characteristics of High Pressure Multistage Pump (고압 다단펌프 축계 진동 특성 고찰)

  • Song, Ae Hee;Song, Jin Dae;Lim, Woo Seop;Yang, Bo Suk
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.10a
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    • pp.592-596
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    • 2012

  • This paper presents numerical analysis result of rotor-bearing system of a multi-stage high pressure pump. Especially resonance possibility, stability and damping factor are estimated for a selected commercial multi-stage high pressure pump. The result shows that it is not easy to avoid resonance of rotor-bearing system against main excitation forces which are residual unbalance force and pressure pulsation. This makes damping effect be more important.

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Characteristic rheological responses of PVA solutions in water-containing solvents

  • Song, Song-Ie;Kim, Byoung-Chul
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10b
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    • pp.181-182
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    • 2003

  • Poly(vinyl alcohol) (PVA) is a semicrystalline polymer whose hydroxyl groups produce inter-and intramolecular hydrogen bonding. The extent of hydrogen bonding is greatly affected by stereoregularity of hydroxyl groups, so-called tacticity, of PVA[1-3]. Hydrogen bonding has a profound effect on the rheological and mechanical properties of the polymer, which is largely determined by the density and spatial arrangement of hydroxyl groups. (omitted)

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Two Phase Oxidation of Aldehydes with Chromic Acid

  • Jae Soon Kim;Tae Soung Huh;Nung Min Yoon
    • Journal of the Korean Chemical Society
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    • v.15 no.2
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    • pp.65-68
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    • 1971

  • The possibility of the two-phase oxidation of an aldehyde to carboxylic acid was studied. Thus the ether solutions of representative aldehydes (2.0M) were treated with 1.5 mole equivalent of chromic acid solution (1.0M) for 30 minutes at room temperature. Of the ten aldehydes tested,m butanal, benzaldehyde, tolualdehyde, o-, m-, p-nitrobenzaldehyde and cinnamaldehyde could be oxidized conveniently to the corresponding carboxylic acid giving an 80-90% yield. But furfural gave only a 30% yield of furoic acid and the oxidation of salicylaldehyde was unsuccessful.

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Fundamental Study on the Compressive Strength of Low Cement Concrete for Typical Floor (지상층용 저시멘트 콘크리트의 압축강도 특성에 관한 기초적 연구)

  • Song, Young-Chan;Kim, Yong-Ro;Min, Choong-Siek;Song, Yong-Won;Park, Jong-Ho;Jeong, Yong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.11a
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    • pp.46-47
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    • 2013

  • In this research, it is investigated strength development by replacement ratio of mineral admixture contents, types of superplastisizer and strength improvement material contents based on industrial byproduct to expand use of low cement concrete for typical floor.

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