Pablo M. Jacovkis

• Ph. D.
• Professor Emeritus at University of Buenos Aires

Air pollution constitutes an environmental risk, evidenced in large urban centers. This work applies a methodology capable of detecting the areas of emission of pollutants when episodes of poor urban air quality are observed. This is carried out coupling air quality indices proposed by United States Environmental Protection Agency with the receptor...

Air pollution constitutes an environmental risk, evidenced in large urban centres. This work applies a methodology capable of detecting the areas of emission of pollutants when episodes of poor urban air quality are observed. This is carried out coupling air quality indices proposed by United States Environmental Protection Agency with the receptor...

We assert that, from a pragmatic point of view, mathematicians treat mathematical objects as if they were real. If a theory is consistent, theorems are discovered (sometimes with analyses not necessarily different from those applied in sciences) and proofs are invented; modern technology cannot exist without accepting the law of excluded middle; a...

During the 1960s but mainly in the 1970s, large mathematical dynamic global models were implemented in computers to simulate the entire world, or large portions of it. Several different but interrelated subjects were considered simultaneously, and their variables evolved over time in an attempt to forecast the future, considering decades as time ho...

Se discute en este trabajo la existencia de un nuevo contexto social que pueda demandar un nuevo modo de investigación y un nuevo perfil de las universidades. Se indica que el modo de investigación no ha cambiado, salvo desde el punto de vista “social” (la manera y velocidad de relacionarse de los investigadores), pero que debe tenerse en cuenta, p...

El documento es el resultado final de un proceso iniciado en julio de 2012 con la presentación de un documento para el debate en el VI Foro Iberoamericano de Responsables de Educación Superior, Ciencia e Innovación celebrado en Cádiz, enmarcado en la XXII Cumbre Iberoamericana de Jefes de Estado y de Gobierno. El documento analiza la situación de l...

Information on spatial and time dependent concentration patterns of hazardous substances, as well as on the potential effects on population, is necessary to assist in chemical emergency planning and response. To that end, some models predict transport and dispersion of hazardous substances, and others estimate potential effects upon exposed populat...

The adverse health effects of the release of hazardous substances into the atmosphere continue being a matter of concern, especially in densely populated urban regions. Emergency responders need to have estimates of these adverse health effects in the local population to aid planning, emergency response, and recovery efforts. For this purpose, mode...

La Red de Indicadores de Ciencia y Tecnología Iberoamericanos e Interamericanos (RICYT) anuncia que se encuentra disponible la edición 2011 de su publicación anual: El Estado de la Ciencia - Principales Indicadores de Ciencia y Tecnología - Iberoamericanos / Interamericanos. Para la edición de este libro se contó con la colaboración de la Agencia...

Resumen Clementina fue la primer computadora con nes académicos y cientícos en llegar a la Argentina. Llegó al país a nes de 1960 y fue instalada en el Pabellón 1 de la Ciudad Universitaria de la Universidad de Buenos Aires. En el presente trabajo se analiza el contexto histórico en el cual se produjo su llegada, tanto a nivel nacional como univers...

The calculation of damage level due to the exposure to a toxic cloud is usually not included in most popular software, or it is included using techniques that do not take into account the variation in concentration over a period of time. In this work, a method is introduced for calculating the temporal evolution of the potential damage level and to...

SUMMARY The implicit methods for the numerical solution of the quasilinear hyperbolic equations of hydrodynamics (Saint-Venant equations) used to analyse reaches of one-dimensional rivers or channels over fixed beds (unsteady case) may be reduced, for each time step (under most finite differences schemes currently applied), to the solution of a lin...

A novel numerical model based on solid deformation is presented in this paper. This thermo-mechanical model can simulate the tectonic evolution of crust and (lithospheric and asthenospheric) mantle under different conditions. Our implementation uses the finite element method (FEM) in order to solve the equations. As a Lagrangian approach is employe...

In this paper we shall briefly describe some aspects of the history, evolution and problems of applied mathematics in Argentina.

The oceans represent a huge energy reservoir consistent of stored solar and gravitational energy in several forms, causing ceaseless movements of an enormous volume of water. This energy is generally diffuse but, in many cases, significantly more concentrated than other forms of renewable energy already being successfully exploited on land. Among t...

Computer science has a curious history in Argentina: it began late (more than ten years later than in USA), had a ten-year span of flowering, was completely destroyed by the military dictatorship in 1966 and, disregarding some advances in small universities in the 1970s, began to weakly revive in 1983. In this article we shall analyze the ten-years...

The uplift and evolution of a noncollisional orogen developed along a subduction zone, such as the Andean system, is a direct consequence of the interrelation between plate tectonic stresses and erosion. Tectonic stresses are related to the convergence velocity and thermal state, among other causes. In this paper a new model designed to investigate...

We applied the perturbative theory to perform sensitivity analysis of the shallow water equations. The numerical solution of these equations was found via the mass lumping finite element technique. Then, the adjoint system of the shallow water equations was derived for the one-dimensional case and the expression of the sensitivity coefficient of a...

We applied the perturbative theory to perform sensitivity analysis of the shallow water equations. The numerical solution of these equations was found via the mass lumping finite element technique. Then, the adjoint system of the shallow water equations was derived for the one-dimensional case and the expression of the sensitivity coefficient of a...

Palabras clave: Trayectorias atmosféricas, dinámica de fluidos, algoritmos paralelos, modelos isentrópicos Resumen. En el presente trabajo desarrollamos modelos computacionales bidimensionales y tridimen-sionales para el problema de transporte de trazadores en la atmósfera. Éstos son modelos de trayectorias lagrangianas y hemos programado versiones...

En este trabajo, presentamos el modelado de procesos tectónicos asociados con deformación cortical en un marco numérico para orógenos del tipo andino formados sin participación de colisiones. Los principales objetivos de este marco numérico son desarrollar un modelo capaz de representar deformaciones a gran escala en zonas de subducción de tipo and...

In this work, the modeling of plate tectonic processes associated with crustal deformation through a numerical framework for non-collisional Andean type orogens is presented. The main objectives of the numerical framework are to develop a numerical model in order to represent large-scale deformation in Andean type subduction zones, to include appro...

In this article we argue that the computer not only works as a powerful tool for numerical modeling of problems in experimental science, but also in a certain sense applied mathematics may be considered an experimental science, whose laboratory is the computer, and therefore computer mathematical models are or may become tools to better know phenom...

Natural time series usually show either a combination of periodic phenomena with stochastic components or chaotic behavior. In many cases, when nonlinear characteristics are computed, they will essentially indicate the most remarkable effects and the results will underestimate or overestimate the real complexity of the system. For that reason signa...

The aim of this work is to formulate a dynamical model of mobile beds in natural channels. The proposed model is based on a simplified form of the rivers hydrodynamic equations and is similar to the generalized logistic map. As a natural consequence, the two parameters of the model are the control variables and they are related to properties of the...

Constant-curl Laplacian equation is a new approach to study the behaviour of flows around bodies that do not present boundary-layer separation. It owns the simplicity and linearity of a potential analysis but also includes the rotational effects induced by a rotational displacement of the body such as turbine blades, maneuvering aircrafts, etc. It...

This work aims to apply the disturbance theory to accomplish sensitivity computations in problems of pollutant transported in liquid media modeled through the advection-diffusion-reaction equation. The numerical solution of the differential equation that describes the behavior of the system was found via the SUPG ("Streamline Unwinding Petrov Galer...

We applied the disturbance theory to perform sensitivity computations of the viscous kinematic wave equation to shallow water problems. The numerical solution of the equation was found via the SUPG finite element technique. Then, the adjoint equation of the viscous kinematic wave equation was derived for the one-dimensional case and the expression...

En este trabajo se implemento un modelo cuasitridimensional de aguas poco profundas para modelizar el vortice polar austral. El sistema de ecuacionesresuhante se integro mediante un metodo espectral basado en las autofunciones del operador de aguas poco profundas sobre la esfera y en la vertical se emple6 interpolacion de trazadores cubicos entre l...

Since 1970 several aerodynamic prediction models have been formulated for the Darrieus turbine. We can identify two families of models: stream-tube and vortex. The former needs much less computation time but the latter is more accurate. The purpose of this paper is to show a new option for modelling the aerodynamic behaviour of Darrieus turbines. T...

We applied the disturbance theory to perform sensitivity computations of the viscous Burgers equation with constant source. The numerical solution of the equation was found via the SUPG finite element technique. Then, the adjoint equation of the viscous Burgers equation was derived for the one-dimensional case and the expression of the coefficient...

A wavelet filter was employed for removing the strong annual wave in the Atuel river runoff data to analyze for other wavelength phenomena of interest and to examine the influence of the ENSO events. After this removal, the influence of ENSO signal in different frequency bands and indications of climatic changes in bands larger than 10 years could...

Climates differing from the present may result in other run-off systems, resulting in a change on any scale of river networks. While this is only of minor importance in the case of small creeks, large rivers adjusting to new equilibria may result in significant changes in erosion, sedimentation, and water discharge. Knowing more about such changes...

We describe the numerical approximations and applications of a mathematical model that governs the flow of oil towards a well. The flow of a single-phase fluid in a porous medium is governed by a parabolic equation obtained by combining the Darcy's and the continuity equations. In order to account for the spatial variations of porosity and permeabi...

This paper deals with the understanding of well-test response in flow through bounded, heterogeneous reservoirs, in the presence of gravity effects. To generate these insights, we solve the two dimensional flow of oil by finite differences. The resulting system of linear equations is solved by a method based on Taylor Series of Matrix Functions (TS...

In this paper we study a family of finite difference schemes in two dimensions to model the single phase flow of oil through heterogeneous porous media. That family depends on one parameter θ, 0 ≤ θ ≤ 1. Using a suitable order of equations and unknowns, a linear system of equations, with a particular structure, is obtained. The corresponding matrix...

The radial flow of oil towards a well in one and two dimensions is modeled by a family of finite difference schemes. This family depends on one parameter θ, 0 ≤ θ ≤ 1. The stability of the proposed schemes is analyzed applying the matrix method, which takes into account boundary conditions. Particularly, in the 2-D case, an “almost pentadiagonal” m...

The objective of this work is to determine the effect of permeability and porosity spatial variations on well test pressure response. Data from three wells and synthetic data are used. Field data consist of permeability and porosity as functions of depth and pressure transient test measurements from the same wells. To achieve the objective, two dif...

In the last decade many efforts have been devoted to obtain a more reliable prediction of reservoir behavior by including in the numerical simulators a better characterization of rock heterogeneities. In this paper we study the influence of permeability and porosity spatial variations on well test pressure response. With this aim, a numerical simul...

The one-dimensional hydrodynamic flow in complex networks that include many branches, junction points, and open boundary points is studied. The shallow-water equations are linearized, and the compatibility conditions at junction points and the boundary conditions at some or all of the open boundary points are analysed. Existence and uniqueness of s...

The shallow water hydrodynamic models with fixed and mobile bed are analyzed. It is shown that, with appropriate simplifying assumptions, they both may be represented by scalar quasilinear hyperbolic equations, written as conservation laws. They may also be easily calibrated, provided that enough data are available. Some generalizations are introdu...

This paper describes an integrated mathematical model, Oper, for use in the analysis and planning of multipurpose water resources systems. A typical system consists of reservoirs, hydropower stations, irrigated land, artificial and navigation channels, etc., over a reach of a river or a river basin. The model takes into account the hydrological, te...

A linear-programming model for use in analysis and planning of multiobjective water resources systems is described in this paper. A typical system consists of reservoirs, hydropower stations, irrigated land, artificial and navigation channels, etc., over a reach of a river or a river basin. The linear programming approach is studied and compared wi...

A hydrological forecasting model of the Uruguay River lower basin was developed for the main contractor of the civil works of the Salto Grande Argentinian-Uruguayan dam. The main purpose of the model was to provide forecasts of incoming floods so that the necessary measures could be taken at the work site during the dam construction. The model, com...

Several multivariate clustering methods are analyzed in which each cluster may have a different metric depending on its covariance matrix. Numerical experiments show that the only reliable method among these is one using a metric suggested by Rohlf [1970] based on the within cluster covariance matrix normalized for unit determinant. (12 references....

In this work simulations of tracer transport through a two-dimensional space were carried on, simulating water diffusion through a biological membrane. Two models were studied: a pure fosfolipidic membrane a nd a membrane with transmembrane proteins. Every membrane was simulated by means of an o ccupation matrix in which every element represents th...

The Río de la Plata can be, has been, and must be, modeled from different viewpoints, with separate or integrated models. On the one hand, it is a typical region for a hydrodynamic two dimensional shallow water modeling; on the other hand, several phenomena related to water quality, dispersion of pollutants, erosion, sedimentation and dredging sugg...

El desarrollo y levantamiento de un or · ogeno como la Cordillera de los Andes tiene su origen en el proceso de subducci· on asociado por el cual la losa oce· anica se hunde por debajo de la placa continental. La deformaci· on de la corteza provocada por la compresi · on resultante de la convergencia de estas dos placas, las velocidades relativas d...