4,058 research outputs found
BREVE TRATTATO / A SHORT TREATISE, NAPOLI 1613
In his monumental History of Economic Analysis, Joseph A. Schumpeter calls Serra “the first to compose a scientific treatise … on economic principles and policy.” This working paper, available only hardcopy and upon request, brings the first ever English translation of Antonio Serra’s Breve Trattato. However, the translation is designed to be used in a workshop to take place in Venice in 2007, sponsored by The Other Canon Foundation, which will produce a final English translation of the text for publication.
Magnetic Thomas-Fermi-Weizs\"acker model for quantum dots: a comparison with Kohn-Sham ground states
The magnetic extension of the Thomas-Fermi-Weizs\"acker kinetic energy is
used within density-functional-theory to numerically obtain the ground state
densities and energies of two-dimensional quantum dots. The results are
thoroughly compared with the microscopic Kohn-Sham ones in order to assess the
validity of the semiclassical method. Circular as well as deformed systems are
considered.Comment: EPJ LateX, revised EPJ-
Magnetic dipole and electric quadrupole responses of elliptic quantum dots in magnetic fields
The magnetic dipole (M1) and electric quadupole (E2) responses of
two-dimensional quantum dots with an elliptic shape are theoretically
investigated as a function of the dot deformation and applied static magnetic
field. Neglecting the electron-electron interaction we obtain analytical
results which indicate the existence of four characteristic modes, with
different -dispersion of their energies and associated strengths.
Interaction effects are numerically studied within the time-dependent
local-spin-density theory, assessing the validity of the non-interacting
picture.Comment: 11 pages, 3 GIF figure
Composizione biochimica di quattro specie fitoplanctoniche impiegate in acquicoltura
The protein, lipid, carbohydrate, and amino acid content of four algae of the genus Chlorella,
Dunaliella, Nannochloris and Tetraselmis was determined: each species was grown on Walne's
media containig two different levels of nitrogen. The results show how tbe media influenced the
biochemical composition of the algae
Electron spin precession in semiconductor quantum wires with Rashba spin-orbit coupling
The influence of the Rashba spin-orbit coupling on the electron spin dynamics
is investigated for a ballistic semiconductor quantum wire with a finite width.
We monitor the spin evolution using the time-dependent Schr\"odinger equation.
The pure spin precession characteristic of the 1D limit is lost in a 2D wire
with a finite lateral width. In general, the time evolution in the latter case
is characterized by several frequencies and a nonrigid spin motion.Comment: 7 pages, 9 figure
Collective oscillations in quantum rings: a broken symmetry case
We present calculations within density functional theory of the ground state
and collective electronic oscillations in small two-dimensional quantum rings.
No spatial symmetries are imposed to the solutions and, as in a recent
contribution, a transition to a broken symmetry solution in the intrinsic
reference frame for an increasingly narrow ring is found. The oscillations are
addressed by using real-time simulation. Conspicuous effects of the broken
symmetry solution on the spectra are pointed out.Comment: ReVTeX, 5 embedded eps, two gifs. Accepted in EPJ
Il Presente e il futuro della legge sulle societĂ in Italia
Nell’ordinamento italiano non si può parlare – come a tutti noto – di una legge sulle
società di capitali, in quanto la disciplina di tali società è contenuta all’interno del sistema
codicistico, che contempla sia le societĂ personali sia le societĂ di capitali. La distinzione,
articolata per tipi di societĂ (tre tipi di societĂ personali a fronte di tre tipi di societĂ di capitali)
ed integrata dalla disciplina delle società mutualistiche e consortili, è stata confermata anche
nella recente riforma del diritto societario italiano, la quale ha riguardato esclusivamente le
societĂ di capitali (societĂ per azioni, societĂ in accomandita per azioni e societĂ a
responsabilitĂ limitata) e le societĂ cooperative.
Pertanto, in questa sede, si farĂ riferimento alle disposizioni della riforma (d.legvo 17
gennaio 2003, n. 6) per tracciare un quadro della disciplina vigente in Italia e delle sue
prospettive, con espressa esclusione dell’esame relativo alla disciplina delle società con azioni
quotate (d. leg.vo 24 febbraio 1998, n. 58) ed a quella delle cooperative
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