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Le Dinamiche Temporali della Condivisone di Conoscenza in contesti di lavoro virtuale: uno studio empirico longitudinale
La gestione della conoscenza aziendale viene ormai unanimemente riconosciuta dagli studiosi di economia aziendale come un’importante leva strategica e competitiva per l’impresa. Tuttavia, nonostante lo sforzo di ricerca profuso sul tema in questi anni, sembra che in letteratura non si siano ancora formate opinioni condivise e stabili circa le modalità più efficaci di gestione, misurazione e valutazione delle conoscenze in azienda. Di contro, gli studi in materia sembrano essere spesso divisi da opinioni divergenti e talvolta opposte sul concetto stesso di conoscenza cui fare riferimento e sugli obiettivi analitici da assegnare alla ricerca scientifica sul tema. Si ritiene che le divergenze analitiche ed epistemologiche che fino ad oggi hanno caratterizzato la letteratura aziendale sul Knowledge Management costituiscano un limite più che un’opportunità al fine di favorire un’efficace comprensione e gestione della conoscenza aziendale da parte del mondo manageriale. A nostro parere, infatti, il top management e i principali livelli direzionali aziendali potrebbero beneficiare di una lettura integrata e organica dei diversi contributi offerti sul tema dalla letteratura accademica, con particolare riferimento alle tecniche di misurazione della conoscenza. Al fine di delineare i primi elementi di questa prospettiva integrata, in vista di una sistematizzazione unitaria dei diversi approcci al tema, in questo lavoro discuteremo i risultati di un caso empirico di Knowledge Management aziendale. Per fare questo, il presente lavoro è stato articolato in due momenti, il primo di analisi teorica, il secondo di analisi empirica. Il primo momento consiste in un’analisi dei principali approcci al tema del Knowledge Management emersi nella letteratura aziendale, al fine di metterne in luce limiti e opportunità . Il secondo momento consiste nell’esposizione e discussione delle evidenze empiriche riscontrate sul campo. Nelle conclusioni verranno discusse alcune possibili implicazioni pratiche e teoriche dell’indagine empirica
Braneworld Cosmological Perturbation Theory at Low Energy
Homogeneous cosmology in the braneworld can be studied without solving bulk
equations of motion explicitly. The reason is simply because the symmetry of
the spacetime restricts possible corrections in the 4-dimensional effective
equations of motion. It would be great if we could analyze cosmological
perturbations without solving the bulk. For this purpose, we combine the
geometrical approach and the low energy gradient expansion method to derive the
4-dimensional effective action. Given our effective action, the standard
procedure to obtain the cosmological perturbation theory can be utilized and
the temperature anisotropy of the cosmic background radiation can be computed
without solving the bulk equations of motion explicitly.Comment: 10 pages, Based on a talk presented at ACRGR4, the 4th Australasian
Conference on General Relativity and Gravitation, Monash University,
Melbourne, January 2004. To appear in the proceedings, in General Relativity
and Gravitatio
Electric Polarization Induced by a Proper Helical Magnetic Ordering in a Delafossite Multiferroic CuFe1-xAlxO2
Multiferroic CuFe1-xAlxO2 (x=0.02) exhibits a ferroelectric ordering
accompanied by a proper helical magnetic ordering below T=7K under zero
magnetic field. By polarized neutron diffraction and pyroelectric measurements,
we have revealed a one-to-one correspondence between the spin helicity and the
direction of the spontaneous electric polarization. This result indicates that
the spin helicity of the proper helical magnetic ordering is essential for the
ferroelectricity in CuFe1-xAlxO2. The induction of the electric polarization by
the proper helical magnetic ordering is, however, cannot be explained by the
Katsura-Nagaosa-Balatsky model, which successfully explains the
ferroelectricity in the recently explored ferroelectric helimagnets, such as
TbMnO3. We thus conclude that CuFe1-xAlxO2 is a new class of magnetic
ferroelectrics.Comment: 4 pages, 4 figure
Spin nematic interaction in multiferroic compound BaCoGeO
We demonstrate the existence of the spin nematic interactions in an
easy-plane type antiferromagnet BaCoGeO by exploring the
magnetic anisotropy and spin dynamics. Combination of neutron scattering and
magnetic susceptibility measurements reveals that the origin of the in-plane
anisotropy is an antiferro-type interaction of the spin nematic operator. The
relation between the nematic operator and the electric polarization in the
ligand symmetry of this compound is presented. The introduction of the spin
nematic interaction is useful to understand the physics of spin and electric
dipole in multiferroic compounds.Comment: 5 pages, 4 figure
Higher Curvature Corrections to Primordial Fluctuations in Slow-roll Inflation
We study higher curvature corrections to the scalar spectral index, the
tensor spectral index, the tensor-to-scalar ratio, and the polarization of
gravitational waves. We find that the higher curvature corrections can not be
negligible in the dynamics of the scalar field, although they are energetically
negligible. Indeed, it turns out that the tensor-to-scalar ratio could be
enhanced and the tensor spectral index could be blue due to the Gauss-Bonnet
term. We estimate the degree of circular polarization of gravitational waves
generated during the slow-roll inflation. We argue that the circular
polarization can be observable with the help both of the Gauss-Bonnet and
parity violating terms. We also present several examples to reveal
observational implications of higher curvature corrections for chaotic
inflationary models.Comment: 12 pages, 4 figure
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