• 제목/요약/키워드: Combination ratio

검색결과 1,610건 처리시간 0.031초

디이젤 기관용 다공연료 분사 밸브의 분사율 측정 (On Rate of Multi-Hole Injector for Diesel Engine)

  • 정달순;안수길;권기린
    • 수산해양기술연구
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    • 제22권1호
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    • pp.41-48
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    • 1986
  • Ifis recommended that the injection rate should be accurate and reliable in the input data of the performance simulation in diesel engine. Matsuoka Sin improved W. Bosch's injection ratio measurement system. Matsuoka Sin reduced length of the test pipe and set the orifice. However, it was not measured accurately to measure the injection ratio due to reflection wave. In the present thesis, the improved measurement system with combination of the conventional W. Bosch type injection ratio measurement system and Matsuoka Sin type corrected W. Bosch type was practically made. The location of orifice and throttle valve was modified and set one more back pressure valve in order to reduce the effect of reflection wave. The results according to injection condition of multi-hole nozzle are following: 1. Measurement error of injection ratio measurement system in this thesis was $\pm$ 1 %, therefore, its reliability was good. 2. The form of injetion ratio is changed from trapezoidal shape to triangle shape with increase of revolution per minute when injection amount is constant. 3. In the case of constant rpm, the initial injection ratio is almost constant regardless of the amount, meanwhile the injection period becomes longer with increase of the amount. 4. The injection pressure of nozzle isn't largely influenced with injection ratio in the case of constant injection amount and rpm, otherwise the initial injection amount is increased by 3-4% when the injection pressure is low. 5. The injection ratio isn't nearly influenced with back pressure.

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복합하중상태에 있는 복합재료 원통형 쉘의 좌굴 거동 (Buckling Analysis of Laminated Composite Cylindrical Shell under Combined Load State)

  • 여경수;양원호;조명래;성기득
    • 한국자동차공학회논문집
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    • 제7권9호
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    • pp.119-130
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    • 1999
  • This paper deals buckling behavior of laminated composite cylindrical shells subjected to combination of axial compression and torison. Linear and nonlinear finite element analysis are carried out . the influence of load type, load ratio, fiber orientation angle, stacking sequence, and intial imperfect on buckling behavior is discussed.

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조합하중을 받는 해양구조물 원통부재의 최동강도 해석 (Utimate strength analysis of cylindrical members of offshore structure subject to combined loads)

  • 박치모
    • 한국해양공학회지
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    • 제11권2호
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    • pp.11-17
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    • 1997
  • Simple and efficient way of nonlinear analysis considering elasto-plastic large deformation is introduced to calculate the strength of ring-stiffened cylinears subject to combined load of axial compression and lateral pressure. Parametric study gives various collapse modes according to the combination ratio of axial compression and lateral pressure, interaction between axial compression and lateral pressure and imperfection sensitivity of ultimate strength.

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2축면내 인장력을 받는 철근콘크리슬래브의 펀칭전단강도 (Punching shear strength of Reinforced concrete slabs subjected to Blaxial In-plane Tension)

  • 김우;모귀석;김대중
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1990년도 봄 학술발표회 논문집
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    • pp.102-107
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    • 1990
  • The research program is directed at studying the behavior and the strength of reinforced concrete slabs subjected to certain combination of punching shear and in-plane tension. Major variables to be investigated are the shear span to depth ratio of reinforced concrete slabs and the degree of the in-plane tensile force which is acting tangent to the slabs. The experimental results are used for understanding of the degree of the interaction between the two loadings, and for developing a new practical design equation.

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Synergistic effect of lysozyme on bactericidal activity of magnolol and honokiol against a cariogenic bacterium, streptococcus mutans OMZ 176

  • Bae, Ki-Hwan;Oh, Hong-Rock
    • Archives of Pharmacal Research
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    • 제13권1호
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    • pp.117-119
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    • 1990
  • A combination of magnolol or honokiol with lysozyme isolated from the egg white of the Korean Ogol fowl (Korean natural monument No.265) exhibited synergistic effect of bactericidal activity against a typical cariogenic bacterium, Streptococcus mutans OMZ 176. The synergistic ratio increased with time dependence.

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복합방진벽에 의한 Rayleigh파의 차단 (Screening of Rayleigh Waves by Composite Barriers)

  • 이종세
    • 한국지진공학회:학술대회논문집
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    • 한국지진공학회 1997년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 1997
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    • pp.133-140
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    • 1997
  • Based on the Green's function technique, an analytical approach is developed to examine the surface wave screening effectiveness of composite wave barriers. The composite barrier consists of a high velocity layer sandwiched between two thin layers of low shear velocity materials. The high velocity layer is represented by differential matrix operators which relate the wave fields on each side of the layer. The low velocity layers are modeled by non-rigid contact conditions which allow partial sliding at the interfaces. Screening ratio of barriers with various combination of material, geometric, and non-rigidness parameters are compared and discussed in some detail.

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A Large Trans/cis Conversion Ratio In Redox-Conjugated Single-Light Reversible Isomerization of a Cobalt Complex with meta-Bipyridylazobenzene Ligands

  • Kume, Shoko;Kurihara, Masato;Nishihara, Hiroshi
    • 전기화학회지
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    • 제5권4호
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    • pp.189-191
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    • 2002
  • Reversible trans-cis isomerization of meta-bipyridylazobenzene coordinated to cobalt was achieved by a combination of photoirradiation with a single UV light source and a Co(II)/Co(III) redox reaction. The trans/cis conversion performance was significantly improved in the meta-form compared with the meta-form ligated to cobalt.

THE DISSOCIATION RATE OF $^1O_2(^1Δg)$ DIMOL IN SOLUTION PHASE

  • Chou, Pi-Tai;Chen, Youn-Chan
    • Journal of Photoscience
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    • 제6권3호
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    • pp.135-139
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    • 1999
  • The ratio of dissociation rate $textsc{k}$-acversus the radiative decay rate $textsc{k}$D of the 1O2(1Δg) dimol has been determined to be $1.5\times$109 by its relaxation dynamcis in combination with a two-step O2((1Δg) sensitizing tetratert-butylphthalocoyanine luminescence. Consequently, with a known $textsc{k}$D value of 1.2 $\times$103S-1 , 10$textsc{k}$-ac has been extracted to be 1.8 $\times$1012S-1 CDCl3.

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연약지반의 입도 혼합비를 고려한 압밀특성평가 (Evaluation of Consolidation Characteristics Considering the Mixed Gradation Ratio of Soft Ground)

  • 박영목;윤상종;채종길
    • 한국지반공학회논문집
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    • 제25권10호
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    • pp.99-110
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    • 2009
  • 부산 신항만 북컨테이너 지역에서 연직배수공법에 의한 연약지반개량을 위해 설계된 제반사항을 검토하고, 현장시험시공을 실시하여 현장계측 결과를 이용한 압밀침하 특성을 검토하였다. 설계치와 현장계측치의 비교검토에서, 설계 압밀도에 비해 실측압밀도가 약 7% 높게 나타났다. 그 차이는 설계당시의 지반정수가 전체적인 지반의 입도 혼합비를 고려하지 않고 점토성분이 많은 시료를 이용하여 보수적으로 적용되었기 때문이라고 판단하여 다양한 입도 혼합비별로 실내 압밀시험을 실시하였다. 실험결과, 점토시료의 실트 및 모래혼합비 증가에 따라 압밀진척도가 증가하는 경향이 나타났으며, 실측 압밀도와 가장 잘 맞은 입도 혼합비는 모래 10%, 실트 50%, 점토 40%였고, 이는 시험시공구역의 평균입도분포와 거의 일치하는 것으로 나타났다. 따라서 모래, 실트 및 점토가 혼재된 연약지반을 개량하는 경우 설계단계에서 전체적인 지층의 특성 및 입도의 혼합비를 충분히 고려할 필요가 있다는 것을 제시했다.