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Search Results: 1 - 10 of 5151 matches for " Hugo; "
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A Generalization of Cramer’s Rule  [PDF]
Hugo Leiva
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2015, DOI: 10.4236/alamt.2015.54016
Abstract:

In this paper, we find two formulas for the solutions of the following linear equation \"\"\"\", where \"\" is a \"\" real matrix. This system has been well studied since the 1970s. It is known and simple proven that there is a solution for all \"\" if, and only if, the rows of A are linearly independent, and the minimum norm solution is given by the Moore-Penrose inverse formula, which is often denoted by \"\" ; in this case, this solution is given by \"\". Using this formula, Cramer’s Rule and Burgstahler’s Theorem (Theorem 2), we prove the following representation for this solution

\"\"

\"\", where \"\" are the row vectors of the matrix A. To the best of our knowledge and looking in to many Linear Algebra books, there is not formula for this solution depending on determinants. Of course, this formula coincides with the one given by Cramer’s Rule when \"\".

A Characterization of Semilinear Surjective Operators and Applications to Control Problems  [PDF]
Edgar Iturriaga, Hugo Leiva
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.14033
Abstract: In this paper we characterize a broad class of semilinear surjective operators given by the following formula where Z are Hilbert spaces, and is a suitable nonlinear function. First, we give a necessary and sufficient condition for the linear operator to be surjective. Second, we prove the following statement: If and is a Lipschitz function with a Lipschitz constant small enough, then and for all the equation admits the following solution .We use these results to prove the exact controllability of the following semilinear evolution equation , , where , are Hilbert spaces, is the infinitesimal generator of strongly continuous semigroup in the control function belong to and is a suitable function. As a particular case we consider the semilinear damped wave equation, the model of vibrating plate equation, the integrodifferential wave equation with Delay, etc.
Archaelogy, Paleoindian Research and Lithic Technology in the Middle Negro River, Central Uruguay  [PDF]
Hugo G. Nami
Archaeological Discovery (AD) , 2013, DOI: 10.4236/ad.2013.11001
Abstract: The Negro river is the most important inner fluvial course in Uruguay. Its basin, mainly the middle portion, has produced an unusual archaeological record characterized by a significant evidence of Paleoindian remains. Systematic archaeological research allowed conducting a number of field and laboratory activities. The identification of Paleoindian vestiges and buried sites was a significant focus of this investigation. The advances on surveys and excavations in Los Molles and Minas de Callorda sites are reported. Different dating methods yielded the first dates in the area and diverse technological analyses on lithic artifacts allow recognizing the existence of unreported techniques and reduction strategies. Functional studies with special attention to Paleo-South American vestiges permitted to identify diverse micro-wear clues. Finally, the role of river basins in the peopling of the eastern part of the southern cone and the hypothesis about the origin of the fishtail pattern is discussed.
New Records and Observations on Paleo-American Artifacts from Cerro Largo, Northeastern Uruguay and a Peculiar Case of Reclaimed Fishtail Points  [PDF]
Hugo G. Nami
Archaeological Discovery (AD) , 2015, DOI: 10.4236/ad.2015.33011
Abstract: A research program directed to deepening the knowledge and understanding of Paleo-American “fishtail” points is being carried out. In pursuit this goal, lithic remains from Cerro Largo department, northeastern Uruguay is examined. One of the samples comes from Paso Centurión, a surface site that has yielded the greatest number of fishtail points in Uruguay. There, and at the Paso Taborda site, several exemplars were reworked as scraping tools, constituting a peculiar case of stone tool recycling and reclaiming by post-Pleistocene hunter-gatherers. The examined collection shed new light on regional lithic assemblages, stone tool behavior and the early colonization of southeastern South America. Additionally, the study of other Uruguayan fishtails show the use of edge-to-edge and overshot flaking, technical features shared with Paleoindian fishtailed points from North and Central America. Similarities with other Paleoindian points from both hemispheres of the New World in relation to the SouthAmerican fishtail origins are discussed.
An International Survey of the Wellbeing of Employees in the Business Process Outsourcing Industry  [PDF]
Andrew Smith, Hugo Smith
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.81010
Abstract: The project described in this article was part of a larger program on wellbeing at work and involved an international survey of staff in the business process outsourcing industry. The survey used the Smith Wellbeing Questionnaire (SWELL) and the results showed that this measured both positive and negative aspects of wellbeing. The sample reported high levels of stress which was predicted by job demands and lack of control and support. High levels of control/support were associated with greater job satisfaction.
The Intercultural Effectiveness of University Students  [PDF]
Hugo M. Gonzales
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.812129
Abstract: Intercultural communication has reached new levels with economic globalization, increased sophistication of communication technologies, and “internationalization” of education. As a critical tool for intercultural effectiveness, having a multicultural personality shapes the nature of interaction with people from other cultural backgrounds. In the university context, to advance internationalization, tertiary institutions need to be real international centers for teaching and learning with respect to people’s world views. This study aimed to explore intercultural effectiveness of university students by using the Multicultural Personality Questionnaire (MPQ). With this purpose in mind, 493 students from the University of Notre Dame (ND), Sydney participated in a survey utilizing the MPQ. This study ascertained differences in dimensions of the MPQ for several demographic variables such as traditional (<24 years of age) vs. non-traditional (>24 years of age) university students, gender, religious affiliation, bicultural status, and level of study. This study confirmed significant differences in intercultural effectiveness across various countries as well as gender, non-traditional students, and bicultural study. It also stressed the role of curriculum changes at universities to strengthen intercultural effectiveness.
The Affective Moral Judgment  [PDF]
Victor Hugo Robles Francia
Open Journal of Philosophy (OJPP) , 2018, DOI: 10.4236/ojpp.2018.83017
Abstract: The affective though and the intuition in moral judgment has been discovered lately (Haidt, 2001). This article analyzes the Moral Judgment theory (Kohlberg, 1964) and the basic logical operations (Piaget, 1950). The rational stages with a few intervention of emotion have been historically assumed by moral judgment theory, which judges the affective as a mistaken notion and as a simple cognitive extension (Greene & Haidt, 2002). This paper demonstrates that the Piagetian basic operations, seriation and categorization are applicable to an affective system. In addition, the intuition is a moral determinant and finally, that neuronal activity confirms an intuitional cognition for the resolution of social problems. It is expected that the present deliberation guides and stimuli researches on the intuition and emotion in moral judgment.
Paleomagnetic Results from Archaeological Sites in Argentinean Patagonia: Evidence for the Holocene Geomagnetic Excursions in Southern South America and Its Chronostratigraphic Implications  [PDF]
Hugo G. Nami
Archaeological Discovery (AD) , 2019, DOI: 10.4236/ad.2019.72008
Abstract: Detailed palaeomagnetic research performed in archaeological and paleontological sites in southern South America yielded a number of highly fluctuating paleosecular variation records with geomagnetic field excursion(s) during the Holocene. To assess this topic a variety of sections of recent sediments were sampled. In the case presented here they belong from diverse continental sedimentary sequences formed in coastal marine and cave’s environments. Paleomagnetic samplings were performed in several deposits in San Blas Bay and Pali Aike areas, respectively located in the northern and southern parts of Argentinean Patagonia region. To collect samples, cylindrical plastic containers 2.5 cm long and 2 cm diameter were carefully pushed into the sections, overlying each other by about 50 percent. Their strike and dip were measured using a Brunton compass and inclinometer; they were consolidated with sodium silicate after removal and numbered from top to bottom. All samples were subjected to progressive AF demagnetization in steps of 3, 6, 9, 12, 15, 20, 25, 30, 40 and 60 mT in a 3-axis static degausser attached to a 2 G cryogenic magnetometer. Additional steps from 80 to 120 mT were used in some samples. Characteristic remnant magnetization was calculated using principal-components analysis, with the best-fitting line going to the origin in the Zijderveld diagrams. In general, maximum angular deviations were generally within low values. Some samples had univectorial behavior, while some showed two or three components. Most of the sections show normal and intermediate polarity directions far from the present GF, while reversed polarities were recorded at San Blas 2, La Serranita 1 and Punta Rubia 2 sites in San Blas Bay as well Saenz cave in the Pali Aike area. They show similar directions observed in nearby sites from southern Patagonia in Argentina and Chile. In fact, previous results obtained at Mylodon, Cueva del Medio, Don Ariel and Las Buitreras caves yielded remanence directions corresponding to obliquely normal, obliquely reversed and reversed field polarity directions with similar VGPs. This situation strengthens the hypothesis of the existence of the Mylodon excursion in southern Patagonia. On the other hand, the presence of intermediate and reverse VGPs in San Blas records and other sites also supports its regional extent in the southern cone of South America. If the presented paleomagnetic features are true GMF behavior, the remarkably PSV record can serve to correlate regional stratigraphies, and to determine relative and absolute chronologies.
Tratamiento con eritropoyetina humana recombinante
Donato,Hugo; Ferro,Hugo;
Medicina (Buenos Aires) , 2006,
Abstract: recombinant human erythropoietin (rhuepo) has become the most widely used cytokine in the world. following the success of its use in patients with end-stage renal disease, the usefulness of rhuepo to ameliorate other anemias was assessed, including pediatric patients and newborn infants. the treatment or prevention of anemia of prematurity with rhuepo resulted in a significant reduction in the number of transfusions and donor exposure. a clear definition of which premature babies must receive therapy needs yet to be established. other indications in neonatal period include hyporegenerative and hemolytic anemias. with the exception of chronic renal failure, in older children the efficacy of rhuepo has not been evaluated as in adults. while an impressive amount of studies were carried out during the last years in adult patients with cancer-related or hiv-infection-related anemias, allowing to establish clear conclusions on its efficacy, only a few trials with small number of patients have been reported in children. up to date, results in pediatric patients suggest that rhuepo therapy is as useful as in adult patients, but prospective, randomized trials including large number of patients are essential to achieve definitive conclusions. results of studies designed to evaluate the efficacy of rhuepo for sustaining an adequate dose of ribavirin in patients receiving treatment for hepatitis c are encouraging. the potential for use of the non-hematopoietic effects of rhuepo in newborn infants is a novel and exciting issue. the role of rhuepo as a tissue protective factor for central nervous system and intestinal mucosa is under exhaustive investigation.
Fishtail Points, Technology and Microwear Analysis from the Negro River Basin, Uruguay  [PDF]
Hugo G. Nami, Alicia Castro
Archaeological Discovery (AD) , 2014, DOI: 10.4236/ad.2014.23008
Abstract: Ongoing research performed in the central part of Uruguay added new Paleo-Southamerican finds from the Negro River basin. A number of lithic exemplars were analyzed to determine their technology and function. The examined artifacts provided a new perspective on Fisthail points. Microwear analysis showed that there is a difference in the location of microscopic polishing between the blade and stem in the examined points. Polishing in the stem’s border might be attributed to leather or a similar substance, probably the leather cord or sinew used to bind the points in the foreshaft. The surface of the stem shows a coarse micro-topography and has patches of black residues. The coarse micro-topography suggests the use of an adhesive substance covering the whole stem, while the black patches are probably the residue used to glue the points in the foreshafts. Most remarkable is the discovery of the use of edge-to-edge and overshot flaking for bifacial reduction, technical features shared with Paleoindian fishtailed points from North and Central America.
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