196,209 research outputs found
1914-1921 c’lebis Tpilisis lit’erat’urul-k’ult’uruli cxovreba
No full textThe essay deals with the rich artistic, literary and cultural life which took place in Tiflis in the Teens and Twenties of the 20th century
Note sul poema "Il cavaliere dalla pelle di leopardo" di Shota Rustaveli
No full textL'articolo tratta di tre problemi relativi al poema "Il cavaliere dalla pelle di leopardo" di Shota Rustaveli: 1)Probabile ascendenza di altre opere di letterature orientali e occidentali sull'autore; 2) Possibile impostazione dualistica di bene e male nella concezione religosa di Rustaveli; 3)Individuazione di quale animale fosse la pelle portata sulle spalle dall'ignoto cavaliere del poema
Numerical suite for the design, simulation and optimization of cathode-less plasma thrusters
No full textA numerical suite developed for the analysis and design of cathodeless plasma thrusters is presented. The suite includes a Global Model that estimates the thruster's propulsive performance by means of a balance of electron energy and population density, and a 3D numerical strategy to assess plasma behavior. The suite incorporates a FLUID and EM modules to solve plasma transport and electromagnetic wave propagation within the discharge chamber. The PLUME module, managed by the Starfish code, handles plasma dynamics in the magnetic nozzle using the electrostatic particle-in-cell approach. The suite has been validated against thrust measurements from a Helicon Plasma Thruster demonstrating the suite's potential for optimizing the design and operation of cathodeless plasma thrusters for space propulsion applications
Neonatal leukemoid reaction and early development of bronchopulmonary dysplasia in a very low-birth-weight infant
No full text
Semi-Analytical Model of a Helicon Plasma Thruster
No full textThis article is devoted to the presentation of a semianalytical model of a helicon plasma thruster based on: 1) a 0-D global source model (GSM) for the simulation of the plasma source; 2) a monodimensional acceleration model for the plasma expansion and thrust production in the magnetic nozzle; and 3) a detachment criterion for the identification of the location in the nozzle where the plasma separates from the magnetic field lines. The developed GSM permits the simulation of magnetic topologies provided for radial cusps in the source region. Three different acceleration models presented in the literature have been implemented and employed for component 2) of the full thruster model. Two detachment criteria have also been considered for component 3). A comparison between the characteristics and the results of the different models employed has been carried out. Finally, the results obtained by all the combinations of acceleration models and detachment criteria presented have been compared against the solutions of a numerical fluid code and experimental thrust measurements. A maximum relative deviation between the results of the acceleration models of 3% was found, while a thrust variation of up to 20%-30% was recorded by changing the detachment criteria. A maximum relative error between the model's predictions and the experimental measurements of 25% was obtained
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