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Search Results: 1 - 10 of 18526 matches for " Alberto "
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Landfill Liner Failure: an Open Question for Landfill Risk Analysis  [PDF]
Alberto Pivato
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.23032
Abstract: The European Union Landfill regulations (1999/31/EC) are based on the premise that technological barrier systems can fully contain all landfill leachate produced during waste degradation, and thus provide complete protection to groundwater. The long-term durability of containment systems are to date unproven as landfill liner systems have only been used for about 30 years. Many recent studies have drawn attention to some of the deficiencies associated with artificial lining systems, particularly synthetic membrane systems. Consequently, failure modes of landfill liners need to be quantified and analysed. A probabilistic approach, which is usually performed for complex technological systems such as nuclear reactors, chemical plants and spacecrafts, can be applied usefully to the evaluation of landfill liner integrity and to clarify the failure issue (reliability) of liners currently applied. This approach can be suitably included into risk analysis to manage the landfill aftercare period.
Some Numerical Curiosities about the Universe  [PDF]
Alberto Coe
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.611169
Abstract: We try briefly the relationship between numbers and some aspects of physical reality. By means of a simple set of mathematical and physical tools what we wanted to find was dimensionless numbers that could fit with a particular symmetry. In this paper we describe a small sheaf of numerical results.
Sport Coaches Learn to Coach in Hong Kong  [PDF]
Alberto Cruz
Advances in Physical Education (APE) , 2017, DOI: 10.4236/ape.2017.74036
Abstract: Sport coaching is dynamic and complex. Sport coaches must develop a range of skills and knowledge to coach competently. Studies have shown that school sport coaches learn to coach through many different situations. School sport coaches seem to learn to coach through life experiences in various learning situations. To date, few studies have investigated the process by which school sport coaches in Hong Kong learn how to coach. Therefore, the present study examined the learning situations in which school sport coaches learn to coach and the factors that influence their coaching practice, using Moon’s generic view of learning.Twelve sport coaches with a minimum of one year’s experienceof coaching in schools were recruited in this study. Snowball sampling was employed to maximise variation of the sample. Two semistructured interviews were conducted to gather information concerning their sporting experiences, career paths, learning-to-coach processes, and coaching practice in schools. Deductive content analysis was used to organise and categorise the data. The trustworthiness of the study was established using peer debriefing and member checking.Findings indicated that school sport coaches learn to coach through formal coaching education courses and informal learning settings: mentoring and exchanging ideas with other coaches and physical education teachers. Sport coaches also reported that their past sporting and coaching experience helped their coaching practice. Number of participants, school equipment and facilities, and weather were major factors that influence the practice of school sport coaches.The findings of the study have implications for the training of sport coaches with respect to their specific learning needs and knowledge of how to coach in Hong Kong’s school system. Learning strategies should be provided to address different learning situations coaches might encounter and the factors that influence practice to
Optimal Selection and Allocation of Sectionalizers in Distribution Systems Using Fuzzy Dynamic Programming  [PDF]
Albornoz Esteban, Andreoni Alberto
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24040
Abstract: This paper describes a calculation strategy that allows determining the optimal number and placement of sectionalizing switches in MV radial distribution networks, in correspondence to technical, regulatory and economical aspects. A formulation that takes into account the investment, maintenance and power interruption costs has been developed, seeking for a reduction in total costs while taking care of the regulatory and technical aspects. A multicriteria optimization procedure allows incorporating in the calculating process various quality indicators which can be either global or individual indexes. This way of formulation makes the proposal flexible as well as applicable to allow including aspects that were not considered in previous papers. The solution methodology is mainly based on dynamic programming, fuzzy logic, heuristics and economic analysis techniques. Given its flexibility, the proposed tool is easily adapted to real distribution systems, by considering the individual requirements of each network. The solutions obtained in simulations are oriented to help decision-making for the operator.
Adjustment of Infiltration Models in Poorly Developed Soils  [PDF]
Alberto I. J. Vich
Open Journal of Modern Hydrology (OJMH) , 2013, DOI: 10.4236/ojmh.2013.31002

Infiltration is a fundamental component of the rainfall-runoff process. It was characterized through the adjustment and comparison of the Smith-Parlange, Green-Amptd, Philip, Horton and Kostiakov equations, using simulated rain in poorly developed soils from three geological formations and from different ages (Marino Fm., Mogotes Fm., quaternary cover). Trials with the rainfall simulator were run in piedmont areas west of the city of Mendoza. Adjustments were performed separately for each of the trials and globally for each surface cover. The adjustment was satisfactory when the observed and the simulated infiltration velocity curves were compared using lumped parameters. The Green-Amptd model exhibited the best behavior for the three covers, while the Smith-Parlange equation was the least accurate, al- though it had little dispersion in the prediction errors. The Kostiakov and Horton equations yielded satisfactory results in view of the fact that the development of the infiltration rate curve was simulated after the impoundment time was determined with the Green-Amptd formula. The Philip model is not consistent, with the exception of the results obtained for the Marino cover. In the post-calibration procedure the parameters showed no noticeable differences with respect to those obtained during calibration. In every case the relative squared error of the infiltration curve was very satisfactory, below 5%.

New Evidence on Rotational Dynamics  [PDF]
Luis Alberto Pérez
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.33016

In this paper, the author confirmed a new theory to explain the mechanical behavior of macroscopic bodies. The confirmed hypothesis is the Theory of Dynamics Interaction by the Professor Gabriel Barceló. Barceló explained his theory in an article called “Analysis of Dynamics Fields in Noninertial Systems”, World Journal of Mechanics, Vol. 2, No. 3, 2012, pp. 175-180. This hypothesis holds that the mechanical behavior of macroscopic bodies in a non-inertial environment opens new assumptions on inertial fields and rotational dynamics. An associated experiment was presented to support the discussion in the paper. The author first became aware of the proposals of Professor Gabriel Barceló’s Theory of Dynamics Interaction through his 2006 article on Saturn planet rings, which suggested unsolved phenomena in rotational dynamics and the inception of a novel theory [1]. Intuitively, the author realized himself about the fact that the cosmos is mechanical from its smallest to its widest comprehensible appreciation. If material behavior is mechanical everywhere and every time, from a subatomic particle, wave or string, to a cluster of galaxies, then our understandable solutions must comply with the Laws of Motion, it could be believed.

Globalization, Cultural Change and Religion: The Case of Pentecostalism  [PDF]
Alberto da Silva Moreira
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.24043
Abstract: The challenges faced by this paper are two folds: to understanding how cultural changes brought about by globalization can influence religions and, conversely, how religions can influence broader cultural change. Globalization has spread powerful cultural forms, such as international popular consumer culture, media culture and the culture of the individual. These cultural forms or horizons interact with and transform local cultures which are often intertwined with traditional religions. Throughout this process, traditional religion can weaken its potential to express local cultures, but can also become a vehicle used to express strategies of identity affirmation. Many modalities of globalization-compatible religion, like Pentecostalism, are also consistently penetrated by consumer culture, media culture and individualism. When they interact with traditional religion, they often function as a critical dissolving factor. Therefore, Pentecostalism and similar religions have themselves become active factors in (global) cultural change processes.
The Better Accuracy of Strassen-Winograd Algorithms (FastMMW)  [PDF]
Paolo D’Alberto
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2014, DOI: 10.4236/alamt.2014.41002
The first error theory and bounds for Fast Matrix Multiplication based on the Strassen-Winograd algorithms (FastMMW) were formulated in the 70s. The theory introduces the concept, which is now known as weakly-stable error analysis, where the error bounds must use matrix norms instead of component-wise bounds. While the theory debunked the instability myth by using matrix scaling and a clean and simple analysis, its bounds are available only as properties of the whole matrices, which are too coarse, pessimistic, at times used to suggest instability, and are not used for algorithm optimization. We build on top of the original theory in order to reformulate the bounds: we show that tighter norm-wise and component-wise bounds are achievable by orthogonal algorithm optimizations. To achieve even better discrimination and circumvent the use of norm bounds, we develop an error theory by using communication and statistics concepts: we investigate lower and upper bounds, we estimate the practical bounds, and we investigate the algorithmic nature of the error for the class of random matrices. The theory and tools are not limited to random matrices and we can foresee further investigations to different matrix classes and algorithms. We propose new and more accurate algorithms. We show that we can improve theoretically and empirically the maximum absolute error of any FastMMW algorithm by 10% - 20% per recursion (we reduce the error by half for 4 recursions). Our theory and practice, in turn, will provide a kick start for the development of hybrid algorithms as accurate as the vendor GEMM implementation, and in certain cases even more accurate for random matrices.
State Variable Model for Considering the Parasitic Inductor Resistance on the Open Loop Performance of DC to DC Converters  [PDF]
Carlos Alberto Lozano Espinosa
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.213006

This paper shows DC and small-signal circuit models for the PWM DC to DC buck, boost and back/ boost converters with the equivalent series resistance of the inductor. The DC voltage transfer function and the efficiency of the converter are derived from the DC model. Small-signal open-loop characteristics are derived from the small-signal model based on a state variable model. A design example proves the performance of the circuit and verification of the model.

The Crisis of Religious Identity and Religious Landscape in Contemporary Brazil  [PDF]
Alberto da Silva Moreira
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.210003
Abstract: Inserted in the processes of economic, political and cultural globalization, there is a crisis within traditional meaning-producing and identity-creating institutions, such as the state, family, school and traditional religions, going on in Brazil and in other Latin American countries. If in the 1930s being Brazilian and Catholic were considered two sides of the same national religious identity coin, which could be applied, mutatis mutandis, to other countries in the region, today Brazil is rapidly becoming a multi-cultural and multi-religious country. It remains the largest Catholic country, but is also already the largest Pentecostal and the largest Spiritualist country in the world. In addition, other religious minorities, such as African-Brazilian religions, Buddhists, Muslims and Jews increasingly occupy the public sphere. Parallel to this shift, there is a significant effort being put forth by many Brazilian and South American religious communities to expand on a global level, such as the Pentecostals, charismatic Catholics, Spiritualists and Afro-Brazilian communities. This presentation analyzes the causes and the data related to this religious and identity change and highlights some trends for the future.
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