• Title/Summary/Keyword: 피크피드

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A Study on the Optimal Cutting conditions for Mild Materials (연질재료의 최적 절삭조건설정에 관한 연구)

  • 최상련
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.1
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    • pp.112-118
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    • 1999
  • Aluminum alloy, which is advantageous to machining and injection, makes a great contribution to shortening in delivery time, infection cycle time and reducing expense. This study presents machining conditions for mild materials and describes the difference between theoretical and practical machined surface roughnesses affected by various machining conditions. Machining results have been evaluated and analyzed under varying machining conditions. Special properties of the mild materials have been presented by the quantitative analysis and the optimal machining condition has been proposed for the mild materials.

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난각질 개선을 위한 사료영양 관리기법(II)

  • Kim, Sam-Su
    • Feed Journal
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    • v.2 no.5
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    • pp.96-99
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    • 2004
  • 상품가치를 높일 수 있는 우수한 난각질을 갖추고 있는 계란을 생산하기 위해서는 육추시부터 계획된 영양관리를 실시해야 한다. 닭 개량의 성과로 현대의 산란계는 고성능 기계와 다름없다. 126일령에 시산하고, 140일령에 산란 50%, 160일령에 산란 90%, 180일령에 산란피크 95%에 올라간다. (중략)

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Voltammetric Determination of Dopamine with the N-Hydroxysuccinimide Modified Carbon Paste Electrode (N-히드록시숙신이미드로 수식한 탄소반죽전극을 이용한 도파민의 전기화학적 측정)

  • Yoo Jae Hyun;Yoo Byung Wook;Kim Soon Shin;Uhm Jung Hee;Nam Hakhyun;Cha Geun Sig
    • Journal of the Korean Electrochemical Society
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    • v.4 no.3
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    • pp.109-112
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    • 2001
  • An activated carbon paste electrode was modified with the N-Hydroxysuccinimide(NHS) layer and applied to determine the dopamine in the presence of an excess ascorbic acid using square-wave voltammetry. The electrochemical properties of the modified electrode were examined in the solution containing dopamine/ascorbic acid using cyclic voltammetry(CV): the separation between the oxidation peaks of dopamine and ascorbic acid was largely dependent on the pH of the sample solution and became maximum at pH 4.0. Hence, the square-wave voltammetric determination of dopamine was carried out in a pH 4.0, 100mM phosphate buffer saline(PBS) containing 140mM NaCl. The detection limit and response slop were improved from $1.0{\mu}M\;to\;5.0\times10^{-2}{\mu}M\;and\;from\;0.93{\mu}A/{\mu}M\;to\;6.1{\mu}A/{\mu}M$, respectively, upon modification of the electrode surface by NHS.