170,092 research outputs found
The emerging securities market in Russia
No full textAuthor's OriginalThis paper examines the Russian equity market from speculative infancy to its modern-day status as an asset in the global economy.Khambata, D. & Aybar, C. (1998). The Emerging Securities Market in Russia. Journal of
East-West Business, 4(3), 5-17. doi: 10.1300/J097v04n03_0
78. Adrados (F. R.), Gangutia (E.), Lopez Facal (J.) y Serrano Aybar (C.). Introduccion a la lexicografia griega
No full textGutierrez. J. 78. Adrados (F. R.), Gangutia (E.), Lopez Facal (J.) y Serrano Aybar (C.). Introduccion a la lexicografia griega. In: Revue des Études Grecques, tome 91, fascicule 434-435, Juillet-décembre 1978. pp. 577-578
Francisco R. Adrados (Dir.), Diccionario griego-español (DGE). Vol. III ; F. R. Adrados, E. Gangutia, J. Lopez Facal, C. Serrano Aybar, Introducción a la Lexicografia Griega
No full textMawet Francine. Francisco R. Adrados (Dir.), Diccionario griego-español (DGE). Vol. III ; F. R. Adrados, E. Gangutia, J. Lopez Facal, C. Serrano Aybar, Introducción a la Lexicografia Griega. In: L'antiquité classique, Tome 63, 1994. pp. 434-435
Hábitos y características deportivas de corredores de ultramaratones en el Noroeste Argentino
No full textFil: Aybar, Manuel. INSIBIO (CONICET).Fil: Isola, Leonardo. Salteños Corren.Fil: Morea, Guillermo. Universidad Nacional de La Plata
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
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
Influencia del reemplazo de agregados de la cantera Aybar y Posada sobre la compresión y el asentamiento de un concreto F’c=210 kg/cm2 para edificaciones, Trujillo 2022
No full textLa investigación tuvo como propósito determinar el impacto de la sustitución de agregado fino de la cantera Aybar y agregado grueso de la cantera Posada en la compresión y asentamiento del concreto modificado Trujillo 2022.
“La investigación fue aplicada, de diseño experimental, con probabilidad de muestreo, para ello se usó fichas validadas como instrumentos que se utilizaron para recolectar los datos, el problema principal es que para la elaboración del concreto convencional, donde se mezclan agregados finos y gruesos, agua y cemento para la construcción civil y vial, la gran mayoría de constructores y ciudadanos obtienen agregados de no óptimos para ser utilizados en la fabricación del concreto, por lo que se realizó 4 diseños de mezcla, un diseño patrón, un diseño con agregado fino de la cantera Aybar, un diseño con agregado grueso de la cantera Posada y un diseño con ambos agregados, para lo cual se elaboró 36 probetas cilíndricas de 15cmx30cm curadas a edades de 7, 14 y 28 días, y 12 ensayos de asentamiento.”
Obteniendo como resultados que el concreto con agregado fino de la cantera Aybar y agregado grueso de la cantera Posada logra obtener una mayor resistencia a la compresión a 28 días de curada con un valor de 240.5 kg/cm2 y una mayor trabajabilidad con 6.4 pulg. Concluyendo que el agregado fino de la cantera Aybar y el agregado grueso de la cantera Posada no influyen positivamente la compresión y el asentamiento de un concreto modificado f´c=210 kg/cm2, Trujillo 2022, siendo estos agregados óptimos para usarse para fabricar concreto para las edificacionesThe purpose of the investigation was to determine the impact of the substitution of fine aggregate from the Aybar quarry and coarse aggregate from the Posada quarry on the compression and settlement of the Trujillo 2022 modified concrete, for which an experimental design investigation was developed, with probability Of sampling.
For this, validated sheets were used as instruments that were used to collect the data, the main problem is that for the preparation of conventional concrete, where fine and coarse aggregates, water and cement are mixed for civil and road construction, the vast majority of Builders and citizens obtain non-optimal aggregates to be used in the manufacture of concrete, for which 4 mix designs were made, a standard design, a design with fine aggregate from the Aybar quarry, a design with coarse aggregate from the Posada quarry. and a design with both aggregates, for which 36 15cmx30cm cylindrical specimens cured at ages of 7, 14 and 28 days were prepared, and 12 settlement tests,
Obtaining as a result that the concrete with fine aggregate from the Aybar quarry and coarse aggregate from the Posada quarry achieves greater compressive strength at 28 days of curing with a value of 240.5 kg/cm2 and greater workability with 6.4 in.
Concluding that the fine aggregate from the Aybar quarry and the coarse aggregate from the Posada quarry do not positively influence the compression and settlement of a modified concrete f'c=210 kg/cm2, Trujillo 2022, these aggregates being optimal to be used to manufacture concrete. for the buildings.
Key Words: Quarry, Aggregates, ConcreteTesi
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
Public hospital costs and quality in the Dominican Republic
No full textMeasuring costs in public hospitals in developing countries is hampered by the lack of an appropriate costing system, or of any systematic cost accounting. Invoices for goods and services, prices for inputs, and patient records are generally absent. As a result, cost measures have historically been based on budget figures - the only available financial data. But budget allocations bear little relationship to the resources actually required to provide services to hospital patients. The patient-based methodology described by the authors circumvents this problem by measuring actual hospital resources allocated to patients. Their study was conducted in a single Dominican hospital during a one week period in April 1989. Their approach documents and gives prices for goods, services, and personnel time provided by the hospital to emergency patients, inpatients, and outpatients. They used the following to measure quality and efficiency: (a) the qualifications and relative costs of medical manpower delivering services; (b) the extent and nature of shortages; (c) comparisons of physician orders and actual services provided; and (d) (for selected diagnoses) the specifics of clinical practices in the hospital, compared with accepted clinical norms for the Dominican Republic. They found that average and total costs of services understate the true costs - because of shortages, inappropriate and underused personnel, and nonfunctioning equipment. Quality of care measures suggest low quality and poor efficiency. Norms of medical practice were not followed in more than 80 percent of the cases examined. Rates of completion for diagnostic tests were below 50 percent for outpatient services and between 60 and 70 percent for inpatient and emergency services. The study registered significant monthly savings of 824 for nonavailability of drugs. Policy recommendations of the authors center on the need to reform the organization and delivery of health care as well as physician payment practices - and to giving more authority to hospital administrators. To make Dominican hospitals more efficient, there must be greater authority and accountability for hospital directors and better incentives for improving medical and management performance. Quality assurance needs great improvement if the Dominican system is to ensure a basic standard of care.Health Monitoring&Evaluation,Health Systems Development&Reform,Business Environment,Business in Development,Health Economics&Finance
Juan Valverde de Amusco: Pioneering the Transfer of Post-Vesalian Anatomy
No full textThis article delves into the life and accomplishments of Juan Valverde de Amusco (c. 1525–c. 1587), a Spanish anatomist. Specifically, it focuses on his book titled HISTORIA de la composición del cuerpo humano. The book was the first anatomy opus published after Andreas Vesalius’ De humani corporis fabrica libri septem, written in a Romance language, the Castilian Spanish language, making it the most renowned post-Vesalian anatomy book in Europe and beyond during the 16th and 17th centuries. Compiling complete editions and reproductions of figures, it had 19 editions and several translations. One of its principal contributions was the initial graphical representation of the stapes ossicle. It provided the first accurate description of the pulmonary circulation, vomer bone, and four extraocular rectus muscles. Throughout the book, Valverde corrected numerous of Vesalius’ anatomical observations. HISTORIA de la composición del cuerpo humano was the first anatomy book to use chalcographic illustrations, which are of superior anatomical quality than those printed from engraved wood in Andreas Vesalius’ book. Next, many anatomy textbooks of that time incorporated Valverde’s book illustrations. Valverde’s book was practical, timely, and well referenced, making it a valuable resource for scholars and non-scholars. The conclusion is that Juan Valverde de Amusco merits a place as a pioneer in scientific knowledge transferDepto. de Anatomía y EmbriologíaFac. de MedicinaTRUEpubDescuento UC
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