176,535 research outputs found
C-Sections, Obesity, and Health-Care Specialization: Evidence from Mexico
No full textReplication files for "C-Sections, Obesity, and Health-Care Specialization: Evidence from Mexico," by Herrera-Almanza, Marquez-Padilla, and Prina, published in the World Bank Economic Review
Marc Marquez : Si Semut Merah Pemecah Rekor
No full textBuku biografi ini membahas tentang Marc Marquez seorang olahragawan, pembalap motoGP. Di dalam buku akan dibahas banyak hal mengenai Marc mulai dari kehidupan hingga inspirasinya menjadi seorang pembalap. Buku ini juga akan disertai dengan komentar beberapa pembalap tersohor tentang Marc.112 p. : col. ill. 24 c
Tailored synthesis of nanostructured WC/a-C coatings by dual magnetron sputtering
No full textNanostructured coatings with variable contents of tungsten carbide (WC) and amorphous carbon (a-C) are prepared by controlling the sputtering power ratio using WC and graphite targets. XRD and TEM/ED analysis shows that increasing the C incorporation, the WC nanocrystalline phases evolve from γ-W2C to β-WC1.x. Further C enrichment leads to a nanocomposite structure of small WC1-x crystals dispersed in a-C matrix. The a-C at.% is estimated by XPS analysis and correlated with the observed tribo-mechanical properties. The hardness and friction properties vary from hard/high friction (36-40GPa; μ=0.6-0.8) to moderate-hard/low friction (16-20GPa; μ~0.2) coatings depending on the film composition. The transition point is found for a-C content of 10at.%. This correlates with a change from nanocrystalline WC to nanocomposite WC1-x/a-C coatings. The overall study will help to understand the previous literature data and will serve as guide for a tailored synthesis of these WC/a-C nanocomposites
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
Retrato de Serafín González, Juan de Figueira y Vicente Marquez
No full textRetrato de los Sargentos de artillería Serafín González, Juan de Figueira y Vicente Marquez y al fondo cañónReverso: Sagto. Serafín González Rodríguez. S. Juan de Figueira, Art. 3 Cartagena. Ferrol / Sgto. Vicente Márquez Moreno, Barriada de la Cinta C. Oviedo 19, Huelva, Art. 31Reproducción digital. Madrid : Red.es : Ministerio de Defensa, 201
Theoretical Evidence for C-F Bond Activation by a Fluoro-calix[4]pyrrole-<i>tert</i>-amine Macrocycle
No full textDensity functional theory as well as highly correlated ab initio molecular orbital theory was used to explore
the possibility of activating C−F bonds in fluoroalkanes by organic macrocycles. The results indicate that
the reaction between fluoro-calix [4]pyrrole-tert-amine and CH3F via a Menshutkin displacement mechanism
is highly favorable and competitive from a thermochemical point of view with the very efficient C−Cl activation
by a simple macrocyclic amine recently reported in the literature (Stanger, L. J.; Noll, B. C.; Gonzalez, C.;
Marquez, M.; Smith, B. D. J. Am. Chem. Soc. 2005, 127, 4184)
Modulating motor learning through transcranial direct-current stimulation: An integrative view
No full textMotor learning consists of the ability to improve motor actions through practice playing a major role in the acquisition of skills required for high-performance sports or motor function recovery after brain lesions. During the last decades, it has been reported that transcranial direct-current stimulation (tDCS), consisting in applying weak direct current through the scalp, is able of inducing polarity-specific changes in the excitability of cortical neurons. This low-cost, painless and well-tolerated portable technique has found a wide-spread use in the motor learning domain where it has been successfully applied to enhance motor learning in healthy individuals and for motor recovery after brain lesion as well as in pathological states associated to motor deficits. The main objective of this mini-review is to offer an integrative view about the potential use of tDCS for human motor learning modulation. Furthermore, we introduce the basic mechanisms underlying immediate and long-term effects associated to tDCS along with important considerations about its limitations and progression in recent years
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
The memory of Alvaro B. Marquez, forever, has works published, Researcher
No full textNota bibliográfica "The memory of Alvaro B. Marquez, forever, has works published, Researcher
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