• 제목/요약/키워드: Cross-sections

검색결과 1,475건 처리시간 0.024초

Phase Shift Analysis of 6Li Elastic Scattering on 12C and 28Si at Elab = 318 MeV

  • Kim, Yong Joo
    • 새물리
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    • 제68권12호
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    • pp.1331-1337
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    • 2018

  • We present a three-parameter phase shift model whose form is the same as that of Coulombmodified Glauber model obtained from Gaussian nuclear densities. This model is applied to the $^6Li+^{12}C$ and the $^6Li+^{28}Si$ elastic scatterings at $E_{lab}=318MeV$. The calculated differential cross sections provide quite a satisfactory account of the experimental data. The diffractive oscillatory structures observed at forward angles can be explained as being due to the strong interference between the near-side and the far-side scattering amplitudes. The optical potentials for two systems are predicted by using the method of inversion. The calculated inversion potentials are found to be in fairly good agreements with the results determined from the optical model analysis in the surface regions around the strong absorption radius. We also investigate the effects of parameters in the three-parameter phase shift model on the elastic scattering cross sections.

  • https://doi.org/10.3938/NPSM.68.1331 인용 KSCI

Dimensionless analysis of composite rectangular and circular RC columns

  • Massumi, Ali;Badkoubeh, Alireza
    • Steel and Composite Structures
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    • 제19권2호
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    • pp.327-348
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    • 2015

  • A numerical procedure is presented that provides ultimate curvature and moment domains for composite rectangular and circular cross-sections of reinforced concrete columns with or without an embedded steel section subjected to combined axial loading and biaxial bending. The stress resultants for the concrete and reinforcement bars are calculated using fiber analysis and the stress resultants for the encased structural steel are evaluated using an exact integration of the stress-strain curve over the area of the steel section. A dimensionless formula is proposed that can be used for any section with similar normalized geometric and mechanical parameters. The contribution of each material to the bearing capacity of a section (resistance load and moments) is calculated separately so that the influence of each geometric or mechanical parameter on the bearing capacity can be investigated separately.

  • https://doi.org/10.12989/scs.2015.19.2.327 인용 KSCI

Method of the known cross sections for calibration of the fast neutron spectrometer with a single-crystal stilbene based detector

  • I.V. Urupa;E.V. Ryabeva;R.F. Ibragimov;V.D. Sapozhnikov
    • Nuclear Engineering and Technology
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    • 제56권9호
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    • pp.3602-3607
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    • 2024

  • The present work is devoted to implementation of the stilbene-based neutron spectrometer energy calibration method. The results of experiments with portable neutron generators and 238PuBe source and scattering materials with known cross sections are used for this method. It is shown that the submitted method makes it possible to carry out fast neutron spectrometry in the energy range from 1 to 15 MeV with the uncertainty of the unfolded neutron energy no more than 200 keV. Neutron spectra unfolding was carried out based on the measured spectra and a Geant4 simulated response matrix. Unfolded spectra were compared with the literature data and reference spectra.

  • https://doi.org/10.1016/j.net.2024.04.010 인용 PDF

Entropy Generation Analysis for Various Cross-sectional Ducts in Fully Developed Laminar Convection with Constant Wall Heat Flux

  • Haghgooyan, M.S.;Aghanajafi, C.
    • Korean Chemical Engineering Research
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    • 제52권3호
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    • pp.294-301
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    • 2014

  • This study focuses on analysis and comparison of entropy generation in various cross-sectional ducts along with fully developed laminar flow and constant uniform wall heat flux. The obtained results were compared in ducts with circular, semicircular, and rectangular with semicircular ends, equilateral triangular, and square and symmetrical hexagonal cross-sectional areas. These results were separately studied for aspect ratio of different rectangular shapes. Characteristics of fluid were considered at average temperature between outlet and inlet ducts. Results showed that factors such as Reynolds number, cross section, hydraulic diameter, heat flux and aspect ratio were effective on entropy generation, and these effects are more evident than heat flux and occur more in high heat fluxes. Considering the performed comparisons, it seems that semicircular and circular cross section generates less entropy than other cross sections.

  • https://doi.org/10.9713/kcer.2014.52.3.294 인용 PDF KSCI

Cross-flow Analogy and Euler Solutions for Missile Body Aerodynamics

  • Lee, Jae-Myung;Park, Seung-O;Kim, In-Sun
    • International Journal of Aeronautical and Space Sciences
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    • 제1권2호
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    • pp.9-16
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    • 2000

  • For aerodynamic design of missile bodies of non-circular cross-section, the combination of the slender body theory and the cross-flow analogy can hardly be applied owing to the lack of experimental data. An alternative is to utilize the Euler solution in the design stage. For enhanced accuracy, however, an adequate viscous correction is necessary to the Euler solution. In this work, such a procedure is examined to compensate the viscous effect by utilizing the concept of proportionality factor in cross-flow analogy. Predictions of aerodynamic coefficients combining the Euler solution and the viscous correction via proportionality factor are made for a missile body of elliptic cross-section. Results indicate that the present approach can be adopted in designing missile bodies of non-circular cross-sections.

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