A. Frova

Sapienza University of Rome

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M. Capizzi

Sapienza University of Rome

Mariapiera Marenzana

Jim McManus

Public Health Wales

A. Polimeni

Sapienza University of Rome

C. Coluzza

Sapienza University of Rome

Valentina Emiliani

Sapienza University of Rome

F. Evangelisti

Roma Tre University

F. Martelli

Institute for Microelectronics and Microsystems

F. Sarto

ENEA Frascati Research Centre

B. Bonanni

University of Rome Tor Vergata

Cooperative Institutions

Istituto Nazionale per la Fisica della Materia

113

Sapienza University of Rome

Istituto Nazionale di Fisica Nucleare

Mylan (Switzerland)

Milano University Press

Centre National de la Recherche Scientifique

University of Bologna

European Organization for Nuclear Research

University of Milan

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

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The Crystal Moon

Oxford University Press eBooks (2006)

A. Frova Mariapiera Marenzana Jim McManus

Abstract Galileo discovers the mountains of the moon. Aristotelian philosophers, refusing to accept that a celestial body can be other than spherical and smooth (canons of perfection), counter that the moon is like a transparent sphere of crystal within whose interior there are regions of higher and regions of lower density. After taking a look at the opening pages of Sidereus Nuncius, where the wonders of the telescope are described, this chapter will go on to illustrate some of the observations Galileo made using the telescope and, in closing, will present his arguments against the “crystal moon”.

Galileo (satellite navigation)

Celestial sphere

Perfection

Crystal (programming language)

10.1093/oso/9780198566250.003.0007

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Study of hydrogenation on near-surface strained and unstrained quantum wells

Journal of Applied Physics (1994)

Ying‐Lan Chang I.-H. Tan Evelyn L. Hu J. L. Merz Valentina Emiliani

We have studied the effects of hydrogenation on the luminescence efficiency of near-surface strained InGaAs/GaAs and unstrained GaAs/AlGaAs quantum wells (QWs). By using two different materials with an analogous structure, we have been able to clarify the effects of substrate temperature, ion dosage, strain profile in the material, and material quality on the local hydrogen concentration. This in turn modifies the behavior of hydrogen, the formation of hydrogen-related defects, and the variation of luminescence efficiency from the near-surface QW.

Quantum Efficiency

10.1063/1.356150

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Citations (9)

Brain natriuretic peptide (BNP)-like immunoreactivity in the central nervous system of the crested newt.

PubMed (1992)

Maria Fosca Franzoni Marcello Canonaco A. Frova Renata Tavolaro

The distribution of brain natriuretic peptide (BNP)-like immunoreactivity (ir) was studied in the brain of a urodele amphibian, the crested newt Triturus carnifex Laur. BNP-like immunoreactive neurons were found mainly in the caudal hypothalamus (retro- and supra-chiasmatic areas) and in the preoptic area. A widespread innervation throughout the brainstem as far as the spinal cord was also observed. By double immunostaining (after section incubation with a-BNP and a-tyrosine hydroxylase-TH-antibodies), close topographical relationships between BNP-like and TH-like immunoreactive neurons within the hypothalamus were found.

Immunostaining

Triturus

Preoptic area

Brain natriuretic peptide

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Excitation-induced absorption and luminescence at the GaSe exciton

Solid State Communications (1978)

J. L. Staehli A. Frova Ph. Schmid

10.1016/0038-1098(78)91071-2

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Citations (5)

E-h plasma luminescence in GaAs sub(1-x)P sub(x) above direct-indirect crossover

Journal of the Physical Society of Japan (1980)

S. Modesti A. Frova M. Capizzi Lucia G. Quagliano J. L. Staehli

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Quenching of excitonic lines in GaAs due to deuterium accumulation at the epilayer/substrate interface

Semiconductor Science and Technology (1993)

F. Sarto M. Capizzi A. Frova

Study of the excitonic spectra of a GaAs epilayer, via the 'luminescence self-absorption' technique, shows that heavy deuteration of the material leads to strong accumulation of deuterium at the epilayer/substrate interface and to the creation of an electric field. This causes full quenching of the free exciton and an Urbach tail extending below the fundamental edge by an energy of the order of the exciton Rydberg. This corresponds to a maximum attained field around the ionization value (5.7*103 V cm-1), and a fixed charge at the interface equal to about 0.1% of the locally accumulated deuterium.

Absorption edge

10.1088/0268-1242/8/7/008

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Citations (3)

Spectral changes in El of Au-GaP diodes and negative resistance

Solid State Communications (1973)

P. Migliorato P. Perfetti G. Margaritondo A. Frova

Saturation (graph theory)

Acceptor

Saturation current

10.1016/0038-1098(73)90383-9

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Citations (2)

Anomalous Franz-Keldysh effect in the electroreflectance of semiconductors

Solid State Communications (1968)

F. Evangelisti A. Frova

10.1016/0038-1098(68)90179-8

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Citations (19)

Crossed and Parallel‐Field Magneto‐Electro‐Reflectance of Germanium in Nonuniform Electric Fields

physica status solidi (b) (1969)

F. Evangelisti A. Frova

Abstract Room‐temperature magneto‐electro‐reflectance experiments near the fundamental edge of germanium have been performed in both the crossed and parallel‐field configuration, using a “day” field‐effect system to achieve zero‐to‐peak modulation of the electric field. The results show that the E ‖ H spectra can be described in terms of photon‐assisted tunneling at each of the Landau levels, although the interpretation of the data is not straightforward due to the strong nonuniformity of the electric field. For E ⊥ H the period of the Landau levels is smaller than in the E ‖ H case and there is evidence that quantization effects are absent in the region of high electric field immediately below the surface. The results suggest that the technique described here may be a convenient tool to investigate magneto‐electro‐effects.

Landau quantization

Magneto

10.1002/pssb.19690330216

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Citations (3)

Posthumous Self-Portrait of Galileo Galilei, Philosopher

Oxford University Press eBooks (2006)

A. Frova Mariapiera Marenzana Jim McManus

Abstract This self-portrait was never written by Galileo, of course, but it is what the authors of this book believe he would have sketched, had the times allowed him to express himself without formal respects and cautious attitudes. In compiling this autobiography, the authors have drawn widely upon letters written by Galileo and by his correspondents, as well as on biographies and documents of his time.

Galileo (satellite navigation)

Portrait

10.1093/oso/9780198566250.003.0001

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