Variaciones de lo figural: El pensamiento plástico de Jean Epstein,Stephen Dwoskin y Philippe Grandrieux

En Discurso,Figura, Jean François Lyotard acuña un término: “figural”, que teóricos como Nicole Brenez y Philippe Dubois han llevado al terreno del análisis de la imagen cinematográfica. El pensamiento figural hace de la materialidad de la imagen, de su plasticidad, su objeto de estudio privilegiado. Los cineastas Jean Epstein, Philippe Grandrieux o Stephen Dwoskin en sus figuraciones fílmicas del cuerpo y del rostro, pero también en sus reflexiones teóricas sobre el cine en forma de artículos o, incluso, documentos directamente asociados al rodaje como su registro filmado, han erigido un espacio privilegiado en que este concepto de lo figural se despliega en múltiples variaciones.

Effect of expiratory flow limitation on respiratory mechanical impedance: a model study

Large phasic variations of respiratory mechanical impedance (Zrs) have been observed during induced expiratory flow limitation (EFL) (M. Vassiliou, R. Peslin, C. Saunier, and C. Duvivier. Eur. Respir. J. 9: 779-786, 1996). To clarify the meaning of Zrs during EFL, we have measured from 5 to 30 Hz the input impedance (Zin) of mechanical analogues of the respiratory system, including flow-limiting elements (FLE) made of easily collapsible rubber tubing. The pressures upstream (Pus) and downstream (Pds) from the FLE were controlled and systematically varied. Maximal flow (Vmax) increased linearly with Pus, was close to the value predicted from wave-speed theory, and was obtained for Pus-Pds of 4-6 hPa. The real part of Zin started increasing abruptly with flow (V) >85%Vmax and either further increased or suddenly decreased in the vicinity of V¿max. The imaginary part of Zin decreased markedly and suddenly above 95%Vmax. Similar variations of Zin during EFL were seen with an analogue that mimicked the changes of airway transmural pressure during breathing. After pressure andV measurements upstream and downstream from the FLE were combined, the latter was analyzed in terms of a serial (Zs) and a shunt (Zp) compartment. Zs was consistent with a large resistance and inertance, and Zp with a mainly elastic element having an elastance close to that of the tube walls. We conclude that Zrs data during EFL mainly reflect the properties of the FLE.

Dynamics of turing patterns under spatiotemporal forcing

We study, both theoretically and experimentally, the dynamical response of Turing patterns to a spatiotemporal forcing in the form of a traveling-wave modulation of a control parameter. We show that from strictly spatial resonance, it is possible to induce new, generic dynamical behaviors, including temporally modulated traveling waves and localized traveling solitonlike solutions. The latter make contact with the soliton solutions of Coullet [Phys. Rev. Lett. 56, 724 (1986)] and generalize them. The stability diagram for the different propagating modes in the Lengyel-Epstein model is determined numerically. Direct observations of the predicted solutions in experiments carried out with light modulations in the photosensitive chlorine dioxide-iodine-malonic acid reaction are also reported.

Dynamics of turing patterns under spatiotemporal forcing

We study, both theoretically and experimentally, the dynamical response of Turing patterns to a spatiotemporal forcing in the form of a traveling-wave modulation of a control parameter. We show that from strictly spatial resonance, it is possible to induce new, generic dynamical behaviors, including temporally modulated traveling waves and localized traveling solitonlike solutions. The latter make contact with the soliton solutions of Coullet [Phys. Rev. Lett. 56, 724 (1986)] and generalize them. The stability diagram for the different propagating modes in the Lengyel-Epstein model is determined numerically. Direct observations of the predicted solutions in experiments carried out with light modulations in the photosensitive chlorine dioxide-iodine-malonic acid reaction are also reported.

Experimental evidence of localized oscillations in the photosensitive chlorine dioxide-iodine-malonic acid reaction

The interaction between Hopf and Turing modes has been the subject of active research in recent years. We present here experimental evidence of the existence of mixed Turing-Hopf modes in a two-dimensional system. Using the photosensitive chlorine dioxide-iodine-malonic acid reaction (CDIMA) and external constant background illumination as a control parameter, standing spots oscillating in amplitude and with hexagonal ordering were observed. Numerical simulations in the Lengyel-Epstein model for the CDIMA reaction confirmed the results.

Pensamiento constructivo y desarrollo emocional en los estudiantes universitarios

El presente estudio tiene como objetivo comprobar la relación entre el Inventariode Pensamiento Constructivo (CTI) de Epstein (1987) y el Cuestionario de Desarrollo Emocionalpara Adultos (CDE-A) elaborado por el GROP (Grupo de Investigación en Orientación Psicopedagógicade la Universidad de Barcelona). Ambos instrumentos fueron utilizados como medidaspara evaluar la Inteligencia Emocional, en la búsqueda por sustentar acciones formativasque favorezcan la promoción y el desarrollo competencias socioemocionales y por consiguiente,el bienestar personal y social de aquellas personas con las que tenemos ocasión de trabajar.Se presentan ambos instrumentos, así como un estudio correlacional en función de los resultadosofrecidos por una muestra de estudiantes universitarios del Grado de Pedagogía de laUniversidad de Barcelona, lo que da lugar a una interesante discusión en torno a la cuestión¿Por qué y para qué utilizar instrumentos de medidas afines a la Inteligencia Emocional?