1,721,435 research outputs found
Measurements of optical characteristics of dilute suspensions and dry deposits of clay particles with a polar nephelometer
No full textOptical characteristics and dimensional ranges of Clay Spur Montmorillonite particles have been determined by means of light-scattering experiments. We have taken advantage of an Aerodynamic Sampler that allows dimensional separation of the particles on a filter that is then made transparent in acetone vapours
On the possibility of using VLBI phase referencing to observe GNSS satellites
No full textThe phase referencing technique is an ob-
serving method that could contribute to improve ac-
curacy in GNSS satellite positioning and to obtain
satellite coordinates directly in ICRF. However, the
strong power emitted by the satellites compared to the
very low emission of natural radio sources (calibrators)
could represent a limiting factor. In fact, the satellite
signal can be easily detected through near sidelobes
when observing, at the same satellite frequency, the
natural calibrator in the main beam. With this work we
have run some simulations for some European VLBI
antennas using the GRASP (General Reflector antenna
Analysis Software Package) v.10 software to assess
the relative power contribution of satellites in the near
sidelobes when observing in L-band a natural calibra-
tor in the main beam. For each examined station, we
have evaluated the minimum angular distance between
the satellite and the calibrator to avoid near-sidelobes
straylight contamination from the satellite emission
when the calibrator is tracked. A discussion of the ob-
tained results is presented and possible observational methods are suggested
Flessibilità e produttività: il caso del lavoro in somministrazione. ASTRIL working paper 4/2012, Università Roma Tre
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“Strategie narrative: il messaggio pubblicitario come testo. Indagine sulla rappresentazione dello psicologo nel contesto pubblicitario”
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