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Search Results: 1 - 10 of 465270 matches for " María A; "
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Can Character Solve Our Problems? Character Qualities and the Imagination Age  [PDF]
María García Alvarez
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.92012
Abstract: The emergence of new technology, incorporation of AI to the work floor and rapid pace of change and complexity around us, contribute to the need for a more sophisticated set of skills as key elements for the 21st century and centuries to come. This paper defends the idea that in the Imagination Age we will require more than just the mastery of traditional foundational literacies. Educational institutions should shift the focus towards the training of character qualities. Meta-competencies directly linked with character will provide students with the ability to deal with complex environments. While the importance of character qualities in education is not new, it will become more relevant to prepare the future generations. Educational institutions are urged to rethink their own methods and roles to prepare students to live and collaborate together with new forms of intelligence.
Soil and Leaf Micronutrient Composition in Contrasting Habitats in Podzolized Sands of the Amazon Region  [PDF]
María Antonieta Sobrado
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410235

Plant macronutrient distribution in podzolized sands of the Amazon caatinga has received attention in several studies; however, the distribution of micronutrients has not been assessed. Soil micronutrient availability has been hypothesized to reflect contrasting habitat characteristics as well as fundamental differences in substrate, and leaf micronutrient composition may reflect the macronutrient content needed to maintain balance for leaf cell functions. In this study, soil and leaf samples were obtained in a toposequence (valley, slope, and mound). Available soil micro- and macronutrients as well as total leaf content were measured by inductively coupled plasma-atomic emission spectrometer and mass spectroscopy. Soil Zn (<1.41 mg·kg-1) and B (<0.31 mg·kg-1) as well as Cu (<1.33 mg·kg-1) levels were very low. Soil Mn was low in the valleys and slopes (0.62-0.87 mg·kg-1), but higher in the mound (6.59 mg·kg-1). Soil Fe (11.48-21.13 mg·kg-1) was well above the critical level in all of

Urban Simulation Models: Contributions as Analysis-Methodology in a Project of Urban Renewal*  [PDF]
María Cecilia Marengo
Current Urban Studies (CUS) , 2014, DOI: 10.4236/cus.2014.23028
Abstract: The recent urban transformations produced in cities indicate the need to propose new theoretical and methodological approaches in physical planning. Based on the idea of complexity, it is required to integrate, in the analysis, multiplicity of interrelated factors involved in urban development, moreover, to develop planning tools that can incorporate variables not initially considered (for example when the norms were sanctioned) and instruments that would provide assessment alternatives to planning decisions in real time. The simulation models are suggested as tools to detect the elements, relationships and the dynamics in a simplified form that allow experiencing on the results. That is to say, a theoretical position on to a computer model is translated to investigate (in an experimental way) possible solutions derived from manipulating the variables, before the phenomenon is materialized. In the case of urban planning, this condition is of particular relevance, given the importance to anticipate unwanted effects in the intervention context that may arise when urban projects are built. The paper evaluates the application of a simulation methodology, based on the dynamics of systems and the application of software that can anticipate the effects of certain decisions in an urban renewal project in the city of Córdoba, Argentina. It applies the General Systems Theory that is a contribution to the notion of complex thought and is trans-disciplinary. Based on the idea of complex and multidimensional city, the effects of a real estate development are analyzed and conclusions on the limits and possibilities of using this tool during the processes of urban management are provided.
Density and Housing: Comparative Evaluation towards a Residential Quality Index. The Case of Collective Dwellings in Córdoba—Argentina  [PDF]
María Cecilia Marengo
Current Urban Studies (CUS) , 2017, DOI: 10.4236/cus.2017.51003
Abstract: The crisis on infrastructure systems, mobility and the demands of service provision in increasingly remote areas with less values of urbanity that result from the dispersed city model, leads to reexamining the consolidated and dense tissues. While presenting a more compact land-use, there should be conditions of urban habitability of higher quality than those in the new undifferentiated and diffuse peripheries. In this context, the research analyzes comparatively different residential proposals of collective dwellings as a function of density. The objective of the work is to evaluate, from an architectural design dimension, significant cases of collective housing built in Córdoba city that offer higher levels of densification in relation to the building environment where they are located. It seeks to identify the advantages in terms of residential quality in the different housing proposals that integrate the cases of study and link it with the density adopted in its design. The methodological approach integrates an evaluation matrix that compares housing complexes with different density values. Analytical dimensions related to urban indicators are selected and others with indicators relating to the design of collective housing. Weighting criteria are used to construct a residential quality index (RQI), and to integrate in a simulation model of the concepts: Density and Residential quality. Finally, the results obtained in this first analytical approach of the problem of study are evaluated new interrogations proposed to advance in the analysis of the different levels of densification that are presented in the proposals and their adequacy.
Zeno of Elea Shines a New Light on Quantum Weirdness  [PDF]
María Esther Burgos
Journal of Modern Physics (JMP) , 2017, DOI: 10.4236/jmp.2017.88087
Abstract: After a brief reference to the quantum Zeno effect, a quantum Zeno paradox is formulated. Our starting point is the usual version of Time Dependent Perturbation Theory. Although this theory is supposed to account for transitions between stationary states, we are led to conclude that such transitions cannot occur. Paraphrasing Zeno, they are nothing but illusions. Two solutions to the paradox are introduced. The first as a straightforward application of the postulates of Orthodox Quantum Mechanics; the other is derived from a Spontaneous Projection Approach to quantum mechanics previously formulated. Similarities and differences between both solutions are highlighted. A comparison between the two versions of quantum mechanics, supporting their corresponding solutions to the paradox, shines a new light on quantum weirdness. It is shown, in particular, that the solution obtained in the framework of Orthodox Quantum Mechanics is defective.
Unravelling the Quantum Maze  [PDF]
María Esther Burgos
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.98106
Abstract: The restoration of philosophical realism as the basis of quantum mechanics is the main aim of the present study. A spontaneous projection approach to quantum theory previously formulated achieved this goal in cases where the Hamiltonian does not depend explicitly on time. After discussing the most relevant flaws of orthodox quantum mechanics, a formulation of the spontaneous projections approach in the general case is introduced. This approach yields experimental predictions which in general coincide with those of the orthodox version and overcomes its main flaws.
A Review of Water Quality Indices Used to Assess the Health Status of High Mountain Wetlands  [PDF]
María Custodio
Open Journal of Ecology (OJE) , 2019, DOI: 10.4236/oje.2019.93007
Abstract: The health status of wetlands depends to a large extent on the permanence and quality of water. However, natural and anthropogenic pressures on these ecosystems are transforming them and driving them to generate timely and reliable information. The aim of this study is to provide a review of water quality indices used to assess the health status of high mountain wetlands. To this end, an exhaustive search was initially carried out for studies with significant contributions to the knowledge of high mountain wetlands in Peru. In total, 90 articles on wetlands published in the last decade (2007-2017) were reviewed through bibliographic managers, of which 25% corresponded to wetland studies in Peru and of these only 6% to water quality in high Andean wetlands.
Microalbuminuria in pediatric patients with hypertension  [PDF]
Nata?a Mar?un Varda
Health (Health) , 2013, DOI: 10.4236/health.2013.54A006

Microalbuminuria in adults has been found to be an early indicator of both renal and systemic vascular disease, as well as significant cardiovascular risk predictor and therapeutic marker. Its role in essential hypertension in adults has also been well established. As diseases like hypertension and obesity have their roots in childhood and are already present in children, influencing the morbidity in adulthood, the role of microalbuminuria has been extensively investigated in children as well. Most investigations have been performed in diabetic children, confirming its clinical significance. There is also enough evidence to suggest that microalbuminuria in obese children should be taken as seriously as in children with diabetes. In children with hypertension rare studies also indicate that its presence identifies hypertensive children with higher risk, although the exact role has to be confirmed in prospective and larger studies. The mechanisms of microalbuminuria onset could be the result of renal damage secondary to hypertension or underlying renal and systemic endothelial dysfunction. Evidence from small intervention studies in children with microalbuminuria also suggests that early intervention with antihypertensive drugs is likely to be beneficial, pointing out the role of microalbuminuria as a therapeutic marker in children too. In addition, we have to stress the importance of follow-up of children with microalbuminuria, confirmation of its persistence and identification of progression. However, longitudinal prospective studies in children, investigating its future cardiovascular risk, are still lacking.

Hypertension in Adolescent  [PDF]
Nata?a Mar?un Varda
Health (Health) , 2016, DOI: 10.4236/health.2016.811110
Abstract: Hypertension in adolescents is, as in other patients, one of the important cardiovascular risk factors, associated with hypertension in adults and with appearance of cardiovascular complications later in life. In recent years it is in increase, in parallel with occurrence of overweight in this age group. There is mostly essential or obesity-related hypertension. It is often asymptomatic, therefore it holds true also for adolescents, that it has to be actively searched, especially in risk groups such as overweight adolescents, adolescents with positive family history or some of the other classical cardiovascular risk factors. If we have normal-weight adolescent with important hypertension or symptomatic adolescent without positive family history, the possibility of secondary hypertension has to be thinking of and extended, on possible cause focused and stepwise diagnostics performed. In this case, the treatment is etiological. Otherwise, the first-line treatment in adolescents comprises nonpharmacological treatment measures. Sometimes, because of poor nonpharmacological treatment compliance and presence of hypertensive-target organ damage, antihypertensive medications have to be introduced. However, preventive actions represent the most important task, in the form of primary and primordial prevention. In this article, diagnostic approach, prevention and treatment strategies in adolescents are shortly presented.
Extreme Rainfall Indices in the Hydrographic Basins of Brazil  [PDF]
María C. Valverde, José A. Marengo
Open Journal of Modern Hydrology (OJMH) , 2014, DOI: 10.4236/ojmh.2014.41002
Abstract: The authors analyze climate extremes indices (CEI) of rainfall over the largest basins of the Brazilian territory: Amazon (AMA), S?o Francisco (SF), Tocantins (TO) and Paraná (PAR) rivers. The CEI represent the frequency of heavy precipitation events (R30mm and R95p) and short duration extreme rainfall (RX5day and RX1day). Droughts (CDDd) are identified based on two indicators: The longest dry period (CDD) and the annual cycle. The results demonstrate that CDDd, RX1day and RX5day occurred with more frequency and intensity in SF basin during El Ni?o events. CDDd was of greater magnitude in the TO basin during La Ni?a events, while an increase of RX1day occurred in El Ni?o. The strong El Ni?o events (1983 and 1997) caused more intense and frequent RX1day and R30mm over the PAR basin. Amazon droughts occurred in two out of the six El Ni?o events. Moreover, the relationship between the positive (negative) sea superficial temperatures anomalies in North (South) Tropical Atlantic and drought in AMA basin was corroborated. A gradual warming of SST was observed at the start of 2003 until it achieved a maximum in 2005 associated with the southwestern Amazon drought. The second highest anomaly of SST was in 2010 linked with drought that was more spatially extensive than the 2005 drought. The spatial distribution of annual trends showed a significant increase of CDD in south-eastern AMA, Upper SF, northern PAR and throughout the TO basins. R20mm, RX1day and RX5day tend to increase significantly in southwestern (northeast) PAR (AMA) and northwestern TO basins. Comparisons between CEI derived from daily precipitation data from Climate Prediction Center (CPCp) and of the ETA_HadCM3 model showed that the model overestimated RX1day, RX5day and CDD, in the four basins. Future scenarios show that dry periods will occur with greatest magnitude in all the basins until 2071-2099 time slice, while RX1day will be more intense in the TO and SF basins.
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