171,012 research outputs found
Fallo: “Aroca, José Eduardo c/Estado Provincial y Correa Peralta, Ana Gabriela, titular de Gabiola Empresa Constructora s/Amparo ambiental”
No full textEn el presente trabajo se aborda la temática relativa a la legitimación activa del
accionante Sr. José Eduardo Aroca, frente al derecho ambiental, promoviendo un recurso de
amparo en contra del Estado Provincial de Catamarca y de la Sra. Ana Gabriela Correa
Peralta en condición de titular de Gabiola Empresa Constructora, (Aroca, José Eduardo
c/Estado Provincial y Correa Peralta, Ana Gabriela, titular de Gabiola Empresa Constructora
s/Amparo ambiental), estudiando los alcances del ámbito de aplicación de la Ley General del
Ambiente No 25.675 y de la ley provincial de Catamarca No 5034, por otro lado nos muestra
cómo la Administración infringe los derechos colectivos de participación ciudadana y abusa
de sus competencias discrecionales traspasando la norma y violando derechos y garantías
esenciales de orden jerárquico no respetando los procedimientos adecuados
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
Migration, trade, and foreign investment in Mexico
No full textPart of the rationale for the North American Free Trade Agreement (NAFTA) was that it would increase trade and foreign direct investment (FDI) flows, creating jobs and reducing migration to the United States. Since poor data on illegal flows to the United States make direct measurement difficult, Aroca and Maloney instead evaluate the mechanism behind these predictions using data on migration within Mexico where the census data permit careful analysis. They offer the first specifications for migration within Mexico, incorporating measures of cost of living, amenities, and networks. Contrary to much of the literature, labor market variables enter very significantly and as predicted once the authors control for possible credit constraint effects. Greater exposure to FDI and trade deters out-migration with the effects working partly through the labor market. Finally, the authors generate some tentative inferences about the impact on increased FDI on Mexico-U.S. migration. On average, a doubling of FDI inflows leads to a 1.5-2 percent fall in migration.Economic Theory&Research,Health Monitoring&Evaluation,Environmental Economics&Policies,Banks&Banking Reform,Municipal Financial Management
TAILORING THE MAGNETIC DOMAIN PATTERNS AND MAGNETIC ANISOTROPY OF SPUTTERED TbFeGa ALLOYS
No full textThe control of the domain patterns in systems with perpendicular magnetic anisotropy (PMA) is of great interest because of their applications on magnetic storage or spintronic devices.
Amorphous Tb-Fe alloys exhibit a pretty large PMA constant that reachs 106 J/m3. Recently, it has been reported a constant of at least 1×105 J/m3 in TbFeGa alloys [1]. We have deposited TbFeGa films by cosputtering using two targets with a composition of TbFe2 and Fe3Ga. Two series of samples were obtained by applying a different type of power source (DC or pulsed) in each target. The evaporation of TbFe2 by means of the DC source enhances the out of plane component of the magnetization. The results indicate that this can be due to the Tb enrichment of the TbFe2-based phases present in the alloys.
Magnetic force microscopy (MFM), which shows the presence of stripe domains, has been used to investigate the rotatable anisotropy of these films. A magnetic field of variable intensity placed at 90 degrees with respect to the stripes direction has been applied, while in-field MFM images were recorded. The results clearly show the correlation between OOP and rotatable anisotropies, which allows to tailor the magnetic domain patterns by changing the films preparation conditions
Tuning the magnetic domain patterns of sputtered TbFeGa alloys
No full textThe control of the magnetic domain patterns together with their time and temperature stability are key issues for the development of new devices. Materials systems with perpendicular magnetic anisotropy (PMA) are of great interest because of their applications on patterned media for magnetic storage or in spintronic devices. Nowadays, different approaches are analyzed to reach this high magnetic anisotropy, leading to various structures such as FePt and CoPt layers, multilayers comprising magnetic transition metals (Co, Fe, CoFe) and noble metals (Pt, Pd, Au) or FeCoB layers with PMA.
Some years ago, Tb-Fe alloys were greatly investigated because of their large out-of-plane anisotropy constant. In spite of this high PMA, for industrial applications it is desirable to have materials with a reduced heavy rare earth content. Some works on bulk TbFeGa alloys have focused on their magnetostrictive properties but the magnetic anisotropy of TbFeGa thin films has just started to be studied.
In this work, we present our investigations on the magnetic properties of TbFeGa thin films. The alloys were obtained by the cosputtering technique using two targets with a composition of TbFe2 and Fe3Ga. Different compositions can be achieved by modifying the power in each sputtering target. Moreover, we have also observed that the magnetic anisotropy and domain patterns also depends on the type of power source used (DC or pulsed). In particular, the evaporation of TbFe2 by means of the DC source enhances the out of plane component of the magnetization being obtained an anisotropy constant of at least 1×10^6 erg/cm3 . The results indicate that this is due to the Tb enrichment of the TbFe2-based phases present in the alloys. Therefore, the magnetic domain pattern can be tailored by means of the composition and the type of power source used in each sputtering target
TAILORING THE MAGNETIC DOMAIN PATTERNS OF SPUTTERED TbFeGa ALLOYS
No full textThe control of the domain patterns in systems with perpendicular magnetic anisotropy (PMA) is of great interest because of their applications on magnetic storage or spintronic devices. Different approaches are investigated to achieve a high magnetic stability. In systems comprised of noble metals such as Pt or Pd, the principal drawback is the high spin orbit interaction that increases the magnetic damping constant.
Amorphous Tb-Fe alloys exhibit a pretty large PMA constant that reaches 106 J/m3. Recently, it has been reported a constant of at least 1×105 J/m3 in TbFeGa alloys [1]. We have deposited TbFeGa films by cosputtering using two targets with a composition of TbFe2 and Fe3Ga. Two series of samples were obtained by applying a different type of power source (DC or pulsed) in each target. In particular, the evaporation of TbFe2 by means of the DC source enhances the out of plane component of the magnetization (Fig. 1). The results indicate that this can be due to the Tb enrichment of the TbFe2-based phases present in the alloys. Therefore, the magnetic domain pattern can be tailored by means of the composition and the type of power source used in each sputtering target
STRIPES ROTATION AND MAGNETIC ANISOTROPY OF TbFeGa ALLOYS
No full textMagnetic films with perpendicular magnetic anisotropy (PMA) are attractive materials for applications in the fields of high density magnetic recording and spintronics. The magnetic domains orientation is known to affect the signal propagation through these materials when used in spintronic devices.
Recently, the PMA of TbFeGa alloys has been demonstrated [1]. In this work TbFeGa films were deposited by cosputtering, using two targets of TbFe2 and Fe3Ga. The effect of the type of power source (DC or pulsed) used in each target on the magnetic domain configuration has been investigated. It was found that the evaporation conditions strongly influence the out of plane (OOP) anisotropy of the films. Magnetic force microscopy (MFM), which shows the presence of stripe domains (fig. 1), has been used to investigate the rotatable anisotropy of these alloys. A magnetic field of variable intensity placed at 90 degrees with respect to the stripes direction has been applied, while in-field MFM images were recorded. The results clearly show the correlation between OOP and rotatable anisotropies, which allows to control the stripe domains rotation process and therefore the stripes orientation, by changing the films preparation conditions
Tailoring the magnetic anisotropy and domain patterns of sputtered TbFeGa alloys
No full textWe report the magnetic anisotropy and domain configuration of cosputtered TbFeGa alloys. The layers were deposited from two targets with compositions TbFe2 and Fe3Ga, respectively. The structural and magnetic properties do not only depend on the composition but also on the growth conditions. Alloys with the same composition but deposited using a DC or a pulsed power source in the TbFe2 target exhibit a different magnetic anisotropy. The perpendicular magnetic anisotropy, the size and topology of domain patterns can be tailored by changing the evaporation parameters of TbFe2. The width of the stripe domain increases from 235 to 835 nm when using the DC source in the TbFe2. We correlate this effect with Tb enrichment of the TbxFe1−x phases present in the samples
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
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
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