Los ricos, esos sí que son peligrosos : Entrevista a Juan Pegoraro

Fil: Oyhandy, Angela. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Rompecabezas : Teoría social, empiria y control social a la luz de Delito y Sociedad, Revista de Ciencias Sociales

La presente investigación tiene como propósito llevar a cabo una aproximación sobre la temática del control social a partir de un estudio exploratorio en cuanto a la utilización del término, razón por la cual no descansa en la intención de reponerlo en la exhaustividad del detalle. En efecto, debido al carácter polisémico que reviste este concepto, en el que subyacen diversas caracterizaciones y valoraciones, estimo que es propicio realizar un aporte por sistematizar su uso en las ciencias sociales en general, y en la sociología, en particular. Asimismo, creo que es relevante desarrollar una investigación alrededor de la temática del control social debido a la centralidad que está adoptando contemporáneamente en nuestro país como problemática social, si se la considera dentro del marco de la denominada seguridad ciudadana y del tratamiento del delito. Ahora bien, el presente trabajo versará sobre los distintos usos y sentidos del concepto control social, y se propone abordarlo tomando como objeto de estudio una serie de artículos publicados en distintos números de ?Delito y Sociedad, Revista de Ciencias Sociales?. En efecto, el objetivo general apuntará a explorar cuáles fueron los usos del concepto de control social a partir de un análisis teórico-metodológico de dichas publicaciones, el cual se encuentra lejos de sostener un binarismo como concepción epistemológica que pretenda disociar la teoría de la práctica

Seawater carbonate chemistry and maximum growth rates of Skeletonema marinoi and Alexandrium ostenfeldii, toxin composition of Alexandrium ostenfeldii in a laboratory experiment

Phytoplankton populations can display high levels of genetic diversity that, when reflected by phenotypic variability, may stabilize a species response to environmental changes. We studied the effects of increased temperature and CO2 availability as predicted consequences of global change, on 16 genetically different isolates of the diatom Skeletonema marinoi from the Adriatic Sea and the Skagerrak (North Sea), and on eight strains of the PST (paralytic shellfish toxin)-producing dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. Maximum growth rates were estimated in batch cultures of acclimated isolates grown for five to 10 generations in a factorial design at 20 and 24 °C, and present day and next century applied atmospheric pCO2, respectively. In both species, individual strains were affected in different ways by increased temperature and pCO2. The strongest response variability, buffering overall effects, was detected among Adriatic S. marinoi strains. Skagerrak strains showed a more uniform response, particularly to increased temperature, with an overall positive effect on growth. Increased temperature also caused a general growth stimulation in A. ostenfeldii, despite notable variability in strain-specific response patterns. Our data revealed a significant relationship between strain-specific growth rates and the impact of pCO2 on growth-slow growing cultures were generally positively affected, while fast growing cultures showed no or negative responses to increased pCO2. Toxin composition of A. ostenfeldii was consistently altered by elevated temperature and increased CO2 supply in the tested strains, resulting in overall promotion of saxitoxin production by both treatments. Our findings suggest that phenotypic variability within populations plays an important role in the adaptation of phytoplankton to changing environments, potentially attenuating short-term effects and forming the basis for selection. In particular, A. ostenfeldii blooms may expand and increase in toxicity under increased water temperature and atmospheric pCO2 conditions, with potentially severe consequences for the coastal ecosystem.

Stability and Transient Performance Assessment in a COTS-Module-Based Distributed DC/DC System

This paper introduces a method to analyze and predict stability and transient performance of a distributed system where COTS (Commercial-off-the-shelf) modules share an input filter. The presented procedure is based on the measured data from the input and output terminals of the power modules. The required information for the analysis is obtained by performing frequency response measurements for each converter. This attained data is utilized to compute special transfer functions, which partly determine the source and load interactions within the converters. The system level dynamic description is constructed based on the measured and computed transfer functions introducing cross-coupling mechanisms within the system. System stability can be studied based on the well-known impedance- related minor-loop gain at an arbitrary interface within the system.

Practical Characterization of Input-Parallel-Connected Converters with a Common Input Filter

The paper presents a method to analyze robust stability and transient performance of a distributed power system consisting of commercial converter modules interconnected through a common input filter. The method is based on the use of four transfer functions, which are measurable from the converter input and output terminals. It is shown that these parameters provide important information on the power module sensitivity to the interactions caused by the external impedances. Practical characterization for the described system structure is performed introducing special transfer functions utilized for the interactions assessment. Experimental results are provided to support the presented analysis procedure.