126,744 research outputs found
Catálogo de los manuscritos jurídicos de la Biblioteca Capitular de La Seu d’Urgell
No full textelaborado bajo la dirección de Antonio García y García por Martin Bertram, Gérard Fransen, Antonio García y García, Domenico Maffei, Paola Maffei, Benigne Marqués Sala, Antonio Pérez Martín; revisado, completado y aumentado por Martin Bertram y Paola Maffei, con la colaboración de Benigne Marqués Sala y Marta Pavón Ramírez; índices: Andrea Bartocc
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
The extinction and distance of Maffei 1
No full textWe have obtained low- and high-resolution
spectra of the core of the highly reddened
elliptical galaxy Maffei 1. From these data, we
have obtained the first measurement of the
Mg2 index and have measured the
velocity dispersion and radial velocity with
improved accuracy. To evaluate the extinction, a
correlation between the Mg2 index and
effective V-I color has been established for
elliptical galaxies. Using a new method for
correcting for effective wavelength shifts, the
V-I color excess reveals that the optical depth
of Galactic dust at 1 mu;m is 1.69+/-0.07.
Thus, AV=4.67+/-0.19 mag, which is
lower by 0.4 mag than previously thought. To
establish the distance, the fundamental plane for
elliptical galaxies has been constructed in I.
The velocity dispersion of Maffei 1, measured to
be 186.8+/-7.4 km s-1, in combination
with modern wide-field photometry in I, leads to
a distance of 2.92+/-0.37 Mpc. The
Dn- sigma; relation, which is
independently calibrated, gives 3.08+/-0.85 and
3.23+/-0.67 Mpc from photometry in B and K',
respectively. The weighted mean of the three
estimates is 3.01+/-0.30 Mpc, which is lower
than distances judged with reference to M32 and
the bulge of M31 from the brightest stars seen
at K'. Since the luminosity of asymptotic giant
branch stars at K' is strongly dependent on age,
the lower distance suggests that the last epoch
of star formation in Maffei 1 occurred farther
in the past than in these other systems. The
distance and luminosity make Maffei 1 the
nearest giant elliptical galaxy. In the absence
of extinction, the galaxy would be among the
brightest in the sky and would have an apparent
size 2/3 that of the full Moon. The radial
velocity of Maffei 1 is +66.4+/-5.0 km
s-1, significantly higher than the
accepted value of -10 km s-1. The
Hubble distance corresponding to the mean
velocity of Maffei 1, Maffei 2, and IC 342 is
3.5 Mpc. Thus, it is unlikely that Maffei 1 has
had any influence on Local Group dynamics
The extinction and distance of Maffei 1
No full textWe have obtained low- and high-resolution spectra of the core of the highly reddened elliptical galaxy Maffei 1. From these data, we have obtained the first measurement of the Mg-2 index and have measured the velocity dispersion and radial velocity with improved accuracy. To evaluate the extinction, a correlation between the Mg-2 index and effective V-I color has been established for elliptical galaxies. Using a new method for correcting for effective wavelength shifts, the V-I color excess reveals that the optical depth of Galactic dust at 1 mum is 1.69 +/- 0.07. Thus, A(V) = 4.67 +/- 0.19 mag, which is lower by 0.4 mag than previously thought. To establish the distance, the fundamental plane for elliptical galaxies has been constructed in I. The velocity dispersion of Maffei 1, measured to be 186.8 +/- 7.4 km s(-1), in combination with modern wide. field photometry in I, leads to a distance of 2.92 +/- 0.37 Mpc. The D-n-sigma relation, which is independently calibrated, gives 3.08 +/- 0.85 and 3.23 +/- 0.67 Mpc from photometry in B and K', respectively. The weighted mean of the three estimates is 3.01 +/- 0.30 Mpc, which is lower than distances judged with reference to M32 and the bulge of M31 from the brightest stars seen at K'. Since the luminosity of asymptotic giant branch stars at K' is strongly dependent on age, the lower distance suggests that the last epoch of star formation in Maffei 1 occurred farther in the past than in these other systems. The distance and luminosity make Maffei 1 the nearest giant elliptical galaxy. In the absence of extinction, the galaxy would be among the brightest in the sky and would have an apparent size 2/3 that of the full Moon. The radial velocity of Maffei 1 is + 66.4 +/- 5.0 km s(-1), significantly higher than the accepted value of -10 km s(-1). The Hubble distance corresponding to the mean velocity of Maffei 1, Maffei 2, and IC 342 is 3.5 Mpc. Thus, it is unlikely that Maffei 1 has had any influence on Local Group dynamics
Dual-phase steel rebars for high-ductile r.c. structures, Part 1: Microstructural and mechanical characterization of steel rebars
No full textThe considerable influence of steel's mechanical behaviour on the dissipative capacity of r.c. structures has led to increasing interest in optimizing the mechanical properties of the reinforcing bars used for seismic applications.
The work presented herein is part of a broad-ranging study on the potential utilization of highly innovative types of steel for reinforced concrete earthquake-resistant structures. In particular, we present the main results obtained in experimental trials on a low-C, Mn-Si steel in the form of concrete reinforcing bars subjected to intercritical tempering treatment in a temperature range between 740 and 820 degrees C to obtain various dual-phase ferrite-martensite structures. The samples were characterized via mechanical tests and metallographic analyses in order to correlate the bars' characteristics with the microstructure of the steel itself.
Experimental characterization of this steel has allowed for the development of a mathematical model to enable the evaluation of the ductility performance of concrete structural elements reinforced with dual-phase steel bars
Felicità e letteratura a Venezia. Maffei, Conti, Goldoni
No full textIl libro ricostruisce la rete letteraria della città di Venezia, considerata come un formidabile laboratorio culturale, teatrale e politico. Da Padova e Verona Conti e Maffei si spostano, facendo la spola con Venezia, oltre che con le grandi capitali europee. Accanto al mito della repubblica, Venezia è idealizzata come la città erede della romanità, come il luogo delle origini della nazione italica, celebrato con favole e versi cui partecipa anche Goldoni. Fra conversazioni, salotti e teatri, si elaborano grandi progetti che riguardano i governi e dunque la pubblica felicità. Quest’ultima si dispiega nell’idea che la letteratura e soprattutto il teatro dovessero riacquistare il buon gusto per educare alla felicità. Così i letterati creano favole nelle quali la felicità ha il prezzo della virtù, cui si accede con la rinuncia alle passioni individuali, e si cimentano nella scrittura di personaggi filosofi, paghi e felici nella loro atarassia che unisce l’aplomb inglese con la memoria dell’antico. Le lettere rendono felici: in questo slogan scelto dalla Felicità delle lettere, la più grande libreria e stamperia veneziana fondata da Smith e Pasquali, si annida il senso profondo dell’antiquaria e dell’indagine filosofica che attraversa pratiche e scoperte di quegli anni
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