• Title/Summary/Keyword: Multicomponent

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Fabrication and Properties of PbO Contained Multicomponent Glass Fiber (PbO함유 다성분계 Glass Fiber의 제조 및 특성평가)

  • 이회관;오영석;이용수;박만규;강원호
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.2
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    • pp.89-93
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    • 2002
  • PbO contained multicomponent glass and fibers have been obtained by melting process and double crucible method. PbO containing glass is most promising for fabrication of high-numerical aperture optical fiber. In this study, main composition is $SiO_2$, PbO and glass composition mix component oxide such as $K_2O$, $Na_2O$, $B_2O_3$, $A1_2O_3$. Also, the optical, mechanical and structural properties of manufactured fibers by double crucible method are investigated.

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System reliability estimation in multicomponent exponential stress-strength models

  • Pandit, Parameshwar V.;Kantu, Kala J.
    • International Journal of Reliability and Applications
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    • v.14 no.2
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    • pp.97-105
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    • 2013
  • A stress-strength model is formulated for a multi-component system consisting of k identical components. The k components of the system with random strengths ($X_1$, $X_2$, ${\ldots}$, $X_k$) are subjected to one of the r random stresses ($X_{k+1}$, $X_{k+2}$, ${\ldots}$, $X_{k+r}$). The estimation of system reliability based on maximum likelihood estimates (MLEs) and Bayes estimators in k component system are obtained when the system is either parallel or series with the assumption that strengths and stresses follow exponential distribution. A simulation study is conducted to compare MLE and Bayes estimator through the mean squared errors of the estimators.

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Transient Multicomponent Mixture Analysis Based On an ICE Numerical Technique for the Simulation of an Air Inggess Accident in an HTGR

  • Lim, Hong-Sik;No, Hee-Cheon
    • Nuclear Engineering and Technology
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    • v.36 no.5
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    • pp.375-387
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    • 2004
  • This paper presents a transient multicomponent mixture analysis tool developed to analyze the molecular diffusion, natural convection, and chemical reactions related to air ingress phenomena that occur during a primary-pipe rupture of a high temperature gas-cooled reactor (HIGR). The present analysis tool solves the one-dimensional basic equations for continuity, momentum, energy of the gas mixture, and the mass of each gas species. In order to obtain numerically stable and fast computations, the implicit continuous Eulerian scheme is adopted to solve the governing equations in a strongly coupled manner. Two types of benchmark calculations were performed with the data of prerious Japanese inverse U-tube experiments. The analysis program, based on the ICE technique, runs about 36 times faster than the FLUENT6 for the simulation of the two experiments. The calculation results are within a 10% deviation from the experimental data regarding the concentrations of the gas species and the onset times of natural convection.

Preparation of Paraelectric PLT Thin Films Using Reactive Magnetron Sputtering of Multicomponent Metal Target

  • Kim, H.H.;Sohn, K.S.;Casas, L.M.;Pfeffer, R.L.;Lareau, R.T.
    • Electrical & Electronic Materials
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    • v.11 no.10
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    • pp.53-59
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    • 1998
  • Paraelectric lead landthanum titanate(PLT) thin films have been prepared by a reactive dc magnetron sputtering system using a multicomponent metal target. The surface area control of each element on the target markedly facilitates the fabrication of thin films of complex ceramic compounds. A postdeposition heat-treatment was applied to all as-deposited PLT thin films at annealing temperatures up to 75$0^{\circ}C$ for crystalization. The composition of the PLT(28) thin filmannealed at $650^{\circ}C$ was: Pb, 0.73; La, 0.28; Ti, 0.88; O, 2.9. The dielectric constant and dissipation factor of the thin film(200 nm) at low filed measurements (500 Vcm-1) are 1216 and 0.018, respectively. The charge storage density using a typical Sawyer-Tower circuit with a 500 Hz sine wave was 12.5 $\mu$Ccm-2 at the electric field of 200 kVcm-1.

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