The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Marko Simonović - One of the best experts on this subject based on the ideXlab platform.

  • Could Quasar Lensing Time Delays Hint to a Core Component in Halos, Instead of H 0 Tension?
    The Astrophysical Journal, 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, Marko Simonović
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

  • Could quasar lensing time delays hint to a Core Component in halos, instead of H0 tension?
    The Astrophysical Journal, 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, Marko Simonović
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

Kfir Blum - One of the best experts on this subject based on the ideXlab platform.

  • Could Quasar Lensing Time Delays Hint to a Core Component in Halos, Instead of H 0 Tension?
    The Astrophysical Journal, 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, Marko Simonović
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

  • Could quasar lensing time delays hint to a Core Component in halos, instead of H0 tension?
    The Astrophysical Journal, 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, Marko Simonović
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

  • Could Quasar Lensing Time Delays Hint to a Core Component in Halos, Instead of H 0 Tension?
    'American Astronomical Society', 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, M. Simonovic
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H 0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large-scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H 0 into accordance with the CMB/LSS value

Emanuele Castorina - One of the best experts on this subject based on the ideXlab platform.

  • Could Quasar Lensing Time Delays Hint to a Core Component in Halos, Instead of H 0 Tension?
    The Astrophysical Journal, 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, Marko Simonović
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

  • Could quasar lensing time delays hint to a Core Component in halos, instead of H0 tension?
    The Astrophysical Journal, 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, Marko Simonović
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

  • Could Quasar Lensing Time Delays Hint to a Core Component in Halos, Instead of H 0 Tension?
    'American Astronomical Society', 2020
    Co-Authors: Kfir Blum, Emanuele Castorina, M. Simonovic
    Abstract:

    The time delay measured between the images of gravitationally lensed quasars probes a combination of the angular diameter distance to the source-lens system and the mass density profile of the lens. Observational campaigns to measure such systems have reported a determination of the Hubble parameter H 0 that shows significant tension with independent determination based on the cosmic microwave background (CMB) and large-scale structure (LSS). We show that lens mass models that exhibit a Cored Component, coexisting with a cusp, probe a degenerate direction in the lens model parameter space, being an approximate mass sheet transformation. This family of lens models has not been considered by the cosmographic analyses. Once added to the model, the cosmographic error budget should become dependent on stellar kinematics uncertainties. We propose that a Core Component coexisting with a cusp could bring the lensing measurements of H 0 into accordance with the CMB/LSS value

Masayuki Naganuma - One of the best experts on this subject based on the ideXlab platform.

  • Design factor using a SiC/SiC composites for Core Component of gas cooled fast reactor. I: Hoop stress
    2006
    Co-Authors: Jae-kwang Lee, Masayuki Naganuma
    Abstract:

    As a part of the design study on Gas cooled Fast Reactor (GFR), Core Component designs of helium gas cooled fast reactor are being researched. The most promising structural materials of Core Components have been identified as ceramics, especially Silicon Carbide fiber reinforced Silicon Carbide matrix composites (SiC/SiC) have an encouraging characteristics. However, the existing design factors for Fast Breeder Reactor (FBR) were based on isotropic properties of metal. Therefore, the design factors of Core Components of GFR considered characteristics of ceramic composites was searched and investigated. Hoop stress of assumed fuel pin model (cylindrical laminated composites tube using SiC/SiC) one of the design factors, it was estimated by thin or thick-walled pressure vessel theory and FEM analysis respectively. The stress of multi-directional laminates was changed at the interface of elements. If it assumes that each element are the ply of 2D weaving fiber, the changing of stress in, the interface will act as laminar shear stress. Therefore, it was considered that to confirm inter-laminar shear strength of composites when we design fiber sequence of SiC/SiC composites is significant point. Through these work, reliability and safety of Core Component will be increased. It was confirmed that applicability of SiC/SiC composites for fuel sub-assembly structural material. Feasible mechanical properties of unirradiatied SiC/SiC composites will have enough strength to the environment in the range of present study. These results are not only to design Core Components of GFR but also to indicate an improvement direction of SiC/SiC composites.

  • design factor using a sic sic composites for Core Component of gas cooled fast reactor i hoop stress
    Ceramic engineering and science proceedings, 2006
    Co-Authors: Jae-kwang Lee, Masayuki Naganuma
    Abstract:

    As a part of the design study on Gas cooled Fast Reactor (GFR), Core Component designs of helium gas cooled fast reactor are being researched. The most promising structural materials of Core Components have been identified as ceramics, especially Silicon Carbide fiber reinforced Silicon Carbide matrix composites (SiC/SiC) have an encouraging characteristics. However, the existing design factors for Fast Breeder Reactor (FBR) were based on isotropic properties of metal. Therefore, the design factors of Core Components of GFR considered characteristics of ceramic composites was searched and investigated. Hoop stress of assumed fuel pin model (cylindrical laminated composites tube using SiC/SiC) one of the design factors, it was estimated by thin or thick-walled pressure vessel theory and FEM analysis respectively. The stress of multi-directional laminates was changed at the interface of elements. If it assumes that each element are the ply of 2D weaving fiber, the changing of stress in, the interface will act as laminar shear stress. Therefore, it was considered that to confirm inter-laminar shear strength of composites when we design fiber sequence of SiC/SiC composites is significant point. Through these work, reliability and safety of Core Component will be increased. It was confirmed that applicability of SiC/SiC composites for fuel sub-assembly structural material. Feasible mechanical properties of unirradiatied SiC/SiC composites will have enough strength to the environment in the range of present study. These results are not only to design Core Components of GFR but also to indicate an improvement direction of SiC/SiC composites.

Joseph M Gattas - One of the best experts on this subject based on the ideXlab platform.

  • experimental investigation of a novel concrete timber floor panel system with digitally fabricated frp timber hollow Core Component
    Construction and Building Materials, 2019
    Co-Authors: Ya Ou, Dilum Fernando, Joseph M Gattas
    Abstract:

    Abstract Concrete-timber composite floor systems have become increasingly popular due to their high sustainability and ease of construction. This paper presents a novel lightweight concrete-timber floor panel system with a fibre reinforced polymer-timber waffle-shaped Core between the concrete and timber layers. Digital fabrication techniques and computer-numerical control machines were used in the Core Component fabrication, resulting in ease of fabrication, high accuracy, and streamlined manufacture process. Four 2.25 m span floor panels were manufactured and tested under four-point bending to investigate their flexural behaviour. Results show that the proposed system has an excellent flexural capacity, and demonstrated a high ductility before ultimate failure. Comparison shows the proposed system outperformed the equivalent reinforced concrete and hybrid timber-concrete panels regarding weight specific moment capacity. The consistent flexural behaviour of the tested specimens also proved the effective quality control from CNC manufacturing.