1,720,983 research outputs found
Effects of Pressure On Electronic Bubbles In Liquid Neon
No full textA calculation is performed for the ground state energy of an electronic bubble in liquid neon as a function of temperature and pressure, and using experimentally determined electron-neon scattering cross sections. The density of the compressed liquid is calculated from an equation of corresponding states. It is found that the electronic bubble should collapse at temperatures near Tc with a few atmospheres of overpressur
Macchina per la preparazione di bevande
No full textUn sistema basato su celle di peltier per raffreddare immediatamente dopo la produzione caffè o infusi (tè camomilla ecc). Il vantaggio è una produzione di bevande calde di qualità più elevata rispetto agli altri sistemi attualmente in uso
The Influence of the Cell Geometry On the Signal Shape In Electron-drift Velocity-measurements
Full text linkSimple Photoelectronic Source For Swarm Experiments In High-density Gases
No full textA simple photocathode for electron injection into high‐density gas is described. Relatively large electronic current pulses have been obtained by using a commerical low‐power xenon flash lamp. The photocathode efficiency has been studied as a function of the metal film thickness. The device has been used in swarm experiments at pressures up to 10 MPa in the temperature range 40–300 K
A study of the LiNH2 - MgH2 system for solid state hydrogen storage
No full textAbstract
The influence of different high energy milling times and of the addition of catalysts such as Nb2O5, TiCl3 and graphite on the hydrogen absorption/desorption (A/D) kinetics of a mixture of 2LiNH2 + 1.1MgH2 has been studied in the temperature range 220–240 °C. It is found that a prolonged milling time is effective in improving the A/D kinetics, irrespective of the presence or not of any kind of tested additive. The enthalpy of decomposition reaction results to be about 40.4 kJ/mol, as derived from van’t Hoff plot using the values of the plateau pressures measured in desorption mode. This thermodynamic parameter fits well with the current literature data
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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