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Search Results: 1 - 10 of 198556 matches for " Iván Medri "
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One-dimensional singular problems involving the p-Laplacian and nonlinearities indefinite in sign
Uriel Kaufmann,Iván Medri
Mathematics , 2015,
Abstract: Let $\Omega$ be a bounded open interval, let $p>1$ and $\gamma>0$, and let $m:\Omega\rightarrow\mathbb{R}$ be a function that may change sign in $\Omega $. In this article we study the existence and nonexistence of positive solutions for one-dimensional singular problems of the form $-(\left\vert u^{\prime}\right\vert ^{p-2}u^{\prime})^{\prime}=m\left( x\right) u^{-\gamma}$ in $\Omega$, $u=0$ on $\partial\Omega$. As a consequence we also derive existence results for other related nonlinearities.
An Ethical Approach to the Concept of Toleration: Understanding Tolerance as a Political Virtue  [PDF]
Ivón Cepeda Mayorga
Open Journal of Philosophy (OJPP) , 2014, DOI: 10.4236/ojpp.2014.44059
Abstract: The concept of toleration is commonly argued in political discourses and debates, when people refer to diversity and pluralism, as a form of respect and understanding. However, this does not represent an improvement at the moment of dealing with issues where a variety of values, conceptions and beliefs arises. In addition, even though when the idea of toleration was developed during Enlightenment, nowadays it seems to lead to a misconception of the term, following a connotation of a passive indifference about diversity. Due to this, the main objective of this text is to analyze the concept of toleration from an ethical perspective that allows thinking about it in terms of a political virtue needed to face the challenges of diversity inside society. In order to show this, the text presents an analysis of different conceptions of the term, in order to highlight the positive notion of toleration; after that, the text moves on, reviewing the idea of toleration from a hermeneutical perspective, as a form to reinforce the positive characteristics of the term, and path to solve the query between tolerance and intolerance. Finally, as a conclusion, it underlines that understanding the concept of toleration from an ethical perspective implies a praxis develop in daily circumstances.
The Difficult Airway: A New Simplified Approach to an Old Complex Problem  [PDF]
Iván Mauricio Alvarado Arteaga
Open Journal of Anesthesiology (OJAnes) , 2017, DOI: 10.4236/ojanes.2017.78023
Abstract: Difficult airway situations are a major cause of morbidity, mortality and malpractice claims in anesthetic practice and other critical care settings. Although infrequent, they are serious and complex situations where many variables interact. Among these variables, quick and accurate rescuer decision-making is a major outcome determinant. Emerging evidence, recent advances in technology and development of new devices have provided new tools to deal with the problem, but still, basic underlying principles of management remain. Based on the available evidence and expert consensus, multiple guidelines and algorithms have been published, but they may have limited applicability, contain confusing and ambiguous recommendations or address very specific clinical situations. This narrative review attempts to summarize, organize and consolidate current trends and supported recommendations of the updated guidelines in one practical, concise and unified guide, proposing a simple, intuitive and novel algorithm.
A Mathematical Model for the Removal of Organic Mater in Stabilization Ponds
Medri, Waldir;Medri, Vandir;
Brazilian Archives of Biology and Technology , 2002, DOI: 10.1590/S1516-89132002000100014
Abstract: this work presents an application to systemize the construction of ponds systems for treatment of domestic sewage. it consisted of two anaerobic ponds operated in parallel during may/97 to april/99. these were connected in series with a chicaned facultative pond. the treatment system was controlled with samples collected from the crude sewage (compound sample), in the affluents and effluents of the ponds and along the flux of the anaerobic and facultative ponds. the following parameters were analyzed: ph, biochemical oxygen demand, chemical oxygen demand, total solids, sedimentable solids, total coliforms, oxygen consumed in acid medium (ocam) and temperature.
Optimization of pond systems for the treatment of swine waste
Waldir Medri,Vandir Medri
Semina : Ciências Exatas e Tecnológicas , 2004,
Abstract: This article discusses the results of a 12-month study involving the monitoring of three pond systems for the treatment of swine waste. The objective of the study was to find operational parameters to optimize the treatment systems. The first system included two anaerobic and one optional pond, and the second and third systems included two anaerobic ponds, two optional ponds and one maturation pond, in a series, with 90% of DQO and 76% of total nitrogen removal efficiency, on average, for the three systems. A mathematical model to minimize residue treatment costs based on economy concepts was developed.
A Mathematical Model for the Removal of Organic Mater in Stabilization Ponds
Medri Waldir,Medri Vandir
Brazilian Archives of Biology and Technology , 2002,
Abstract: This work presents an application to systemize the construction of ponds systems for treatment of domestic sewage. It consisted of two anaerobic ponds operated in parallel during May/97 to April/99. These were connected in series with a chicaned facultative pond. The treatment system was controlled with samples collected from the crude sewage (compound sample), in the affluents and effluents of the ponds and along the flux of the anaerobic and facultative ponds. The following parameters were analyzed: pH, Biochemical Oxygen Demand, Chemical Oxygen Demand, Total Solids, Sedimentable Solids, Total Coliforms, Oxygen Consumed in Acid Medium (OCAM) and temperature.
Conditions Where the Chaotic Set Has a Non-Empty Residual Julia Set for Two Classes of Meromorphic Functions  [PDF]
Patricia Domínguez, Iván Hernández
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.411A2004
Abstract:

We define the Fatou and Julia sets for two classes of meromorphic functions. The Julia set is the chaotic set where the fractals appear. The chaotic set can have points and components which are buried. The set of these points and components is called the residual Julia set, denoted by \"\", and is defined to be the subset of those points of the Julia set, chaotic set, which do not belong to the boundary of any component of the Fatou set (stable set). The points of \"\" are called buried points and the components of \"\" are called buried components. In this paper we extend some results related with the residual Julia set of transcendental meromorphic functions to functions which are meromorphic outside a compact countable set of essential singularities. We give some conditions where \"\".

Bilinear Model Proposal for Seismic Analysis Using Triple Friction Pendulum (TFP) Bearings  [PDF]
Iván Delgado, Roberto Aguiar, Pablo Caiza
Open Journal of Civil Engineering (OJCE) , 2017, DOI: 10.4236/ojce.2017.71002
Abstract:
An analytical model is presented for seismic analysis of triple friction pendulum bearings and validated using 81 bearing tests, each subjected to three cycles, with a duration of 12 seconds and using 250, 200 and 100 tons vertical loads. The main objective is to develop formulas for bilinear behavior using maximum, average and minimum friction coefficients to check which is the closest to the real behavior in the laboratory tests and comparatives curves plotting to observe the standard derivation. Parameters such as friction coefficients, effective stiffness, damping factor and vibration periods are analyzed to understand the structural behavior of the TPF bearings.
John Gray “Misa negra. La religión apocalíptica y la muerte de la utopía”
Iván Garzón
Revista Enfoques : Ciencia Política y Administración Pública , 2010,
Abstract: Review of the book Misa negra. La religión apocalíptica y la muerte de la utopía written by John Gray
La fenomenología como atavismo
Galán, Iván
Arbor : Ciencia, Pensamiento y Cultura , 2009, DOI: 10.3989/arbor.2009.i736.280
Abstract: This paper deals with phenomenology as a result of phenomenological freedom in its possibility of understanding a phenomenon as wild phenomenon. From this perspective, we are enabled to transcend established symbolic systems and to pose the question on the existence of a sense which is immature, not-saturated and imperfect without exception. El artículo pretende mostrar la vigencia de la fenomenología como expresión de la libertad fenomenológica, como posibilidad siempre abierta de acceder al fenómeno en cuanto fenómeno puro, registro arquitectónico en el que, saltando por sobre los sistemas simbólicos instituidos, nos es permitido plantear en toda su radicalidad la pregunta por la existencia de un sentido siempre prematuro, no saturado y jamás clausurable.
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