Results 221 to 230 of about 190,484 (257)

On the Earth-Space Site Diversity Modeling: A Novel Physical-Mathematical Outage Prediction Model

IEEE Transactions on Antennas and Propagation, 2012
A novel model based on the bivariate inverse Gaussian (IG) distribution is presented for the prediction of the outage performance of a dual site diversity Earth-space system. In the present paper, the exceeded rain attenuation induced on each Earth-space path is assumed that follows the IG distribution. The joint rain attenuation exceedance probability
Charilaos I. Kourogiorgas, Athanasios D. Panagopoulos, John D. Kanellopoulos   +2 more
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Heat and mass transfer in hydrothermal systems, physical-mathematical models and experiments

Geothermics, 1970
Abstract In order to investigate processes of heat and mass transfer as well as the dynamics of the formation of temperature fields of natural hydrothermal systems physico-mathematical models were developed which accounted for actual conditions of contemporary hydrothermal processes (temperature, pressure, thermo-physical properties or rocks, latent ...
V.N. Kochergin, V.D. Pampura
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Physical–mathematical modelling of fluid and particle transportation for DNA vaccination

International Journal of Engineering Science, 2006
Abstract The powdered injection system (PowderJect) is a novel needle-free device for the delivery of micron DNA vaccines. The underlying principle is to harness energy from compressed Helium gas to accelerate a pre-measured dose of DNA vaccine coated in micro-gold particles to an appropriate momentum in order to penetrate the outer layer of the skin
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Some Unifying Concepts in Reliablity Physics, Mathematical Models, and Statistics

Fifth Annual Symposium on the Physics of Failure in Electronics, 1966
The basic concepts of dimensional analysis are used to make a general examination of reliability physics, mathematical models, and statistics. Beginning with reliability physics, an examination of Eyring's equation is made using Buckingham's Pi theorem. The Arrhenius equation is then seen to be an approximation to the Eyring equation.
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Physical–mathematical model of Lorentz factor for the integrated intensity of single crystal diffraction

Computational Materials Science, 2014
Abstract The Lorentz factor is a sensitive issue of X-ray diffraction because it is taking into account some factors which influence the intensity of diffracted X-radiation, such as: (i) the geometry of the experiment and also (ii) the single crystal or poly-crystals size in the irradiation case of a set of crystallites (crystalline powder).
Florina Violeta Anghelina, Ileana Nicoleta Popescu, Vasile Bratu, Constantin C. Anghelina, Carmen Otilia Rusanescu   +4 more
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Physical, mathematical, and numerical modeling

2021
Alexandru Morega, Mihaela Morega, Alin Dobre   +2 more
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A physical-mathematical model for the performances of an oscillating fertilizer spreader

2001
This paper describes the development of approximating equations for the spread patterns of an oscillating fertilizer spreader for granular fertilizer.
VENTURI, ADRIANA, CIONI, ALDO, FALCIANI, ROBERTO   +2 more
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Application of a semi-empirical physical-mathematical model in determining the activity concentration of 226Ra in granites

Applied Radiation and Isotopes
This study aimed to estimate the activity concentration of 226Ra in granite samples collected from various regions of Brazil, using a simplified semi-empirical physical-mathematical model. The importance of such an assessment lies in the fact that granite, widely used in construction, can be a source of radioactive contamination due to the presence of ...
Ricardo Rossasi Geraldo, Sergei Anatolyevich Paschuk, Janine Nicolosi Correa, Valeriy Denyak, Monique Soares de Oliveira, Guilherme Soares Zahn   +5 more
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Physical–Mathematical Modelling and Its Role in Learning Physics

2021
Pospiech, Gesche, Fischer, Hans E.
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Physical-mathematical modelling the breakdown formation in high current gas filled diode

Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum, 2002
A model of breakdown formation in a high current gas filled diode has been developed. The model enables calculation of some parameters and properties of the plasma formation, the distribution of the potential during the gap evolution of the space charge, as well as the instant magnitude of the current and voltage at any time.
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