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Semi-empirical scattering correction model for MSCT
SPIE Proceedings, 2007Scattering in CT is a major process that may result in severe image artifacts. In order to suppress this scattering, most CT scanners are equipped with post collimation anti-scatter grid along the fan beam direction. In the longitudinal direction (z-direction) no hardware solution has been implemented since the scattering is negligible in narrow ...
O. Amir, I. Sabo-Napadensky
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The semi-empirical thermosphere model DTM2013
2014Atmospheric density models are used in satellite orbit determination and prediction programs to compute the atmospheric drag force, as well as in upper atmosphere studies. They represent temperature and (partial) density as a function of altitude, latitude, local solar time, day-of-year, and parameters related to the state of atmospheric heating due to
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A simple semi-empirical model for the magnetospheric substorm
Planetary and Space Science, 1981Abstract A first order description of the behaviour of the electric and magnetic fields in the magnetotail during substorms is obtained taking into account the known experimental information. For the growth phase the spatial distribution of the electric field and the temporal evolution of the neutral sheet current density are studied.
V.S. Semenov, V.A. Sergeev
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A semi-empirical convection model for northward IMF
Journal of Atmospheric and Terrestrial Physics, 1986Abstract Observations of convective electric fields and Birkeland currents during northward IMF are unified in a semi-empirical quantitative model, in which the total potential is regarded as the summation of three parts: φ v , viscous convection with two crescent cells around the polar cap boundary; φ n , positive B z convection with ...
Min-Yun Zi, Chang-Shou Shen
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Semi-empirical modeling of apertures by use of FDTD
1999 IEEE International Symposium on Electromagnetic Compatability. Symposium Record (Cat. No.99CH36261), 2003A novel method to include models of complex apertures into the finite-difference time-domain method is presented. Instead of resolving the geometrical details of the aperture, the aperture is treated as a magnetic dipole. The properties of the magnetic dipole moment are determined using the measured transmission cross section of the aperture. This semi-
T. Martin, M. Backstrom
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Semi-Empirical Model for the Thermally tunable LPFG
2007 Conference on Lasers and Electro-Optics - Pacific Rim, 2007We propose a semi-empirical model for the analysis of a temperature-tuned long-period fiber gratings (LPFG) filter. Applying the multi-port lattice model to LPFGs, meanwhile utilizing the empirically determined temperature-dependence of core-to-clad mode-coupling coefficients, we achieve a precise, practical means of the transmission spectrum analysis ...
Junkye Bae +5 more
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Semi-empirical groundwork of the bond-valence model
Acta Crystallographica Section B Structural Science, 1995The bond-valence model (BVM) which relates the length R of a bond to its bond valence s is a widely used empirical approach to the interpretation and prediction of atomic arrangements in crystals. However, a theoretical foundation of the BVM appears to be fairly inadequate so far.
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Semi-empirical model of the rill erosion of soils
Eurasian Soil Science, 2007Semi-empirical equations for describing the erosive and transporting capacities of low-depth flows with account for their interaction with eroded soil were developed and experimentally and theoretically substantiated. These equations can form the basis for a unified model of rill erosion under irrigation, rainfall, and snowmelt runoff conditions.
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A Semi-Empirical Model for Dynamic Stall
Journal of the American Helicopter Society, 1989J. G. Leishman, T. S. Beddoes
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Semi-empirical Modelling of Hydrogen Sorption Isotherms
2021Solid-state hydrogen storage is the key to environmentally-friendly fuel economy. Several reports have demonstrated adsorption within micropores can densify hydrogen past the solid phase [1] moving the field closer to practical hydrogen storage. However, determination of adsorbate hydrogen density is difficult, expensive and time-consuming.
Brewster, Charlie D +4 more
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