RESUMEN A pesar de los numerosos esfuerzos dirigidos durante las últimas décadas a investigar los factores determinantes de la oferta informativa empresarial, existe una amplia variabilidad en los resultados obtenidos por los distintos estudios, no siendo concluyente la evidencia respecto al efecto de variables como el endeudamiento, concentración del accionariado o rentabilidad, lo que limita sobremanera el desarrollo de una teoría general y el avance en la investigación empírica en esta área. El objetivo del presente trabajo es integrar, mediante la técnica del meta-análisis, los resultados de la literatura previa, examinando los efectos que moderan la relación entre revelación de información y sus principales factores determinantes. Los resultados ponen de manifiesto que el tipo de información revelada, el sistema legal y el periodo temporal de la muestra ejercen una fuerte influencia en la variabilidad de los resultados obtenidos en este prolífico campo de investigación. PALABRAS CLAVE Revelación de información; Meta-análisis; Divulgación voluntaria; Mercados de capitales.
High-intensity laser facilities, such as the National Ignition Facility (NIF), enable the experimental investigation of plasmas under extreme, high-energy-density conditions. Motivated by validating models for collisional heat-transfer processes in high-energy-density plasmas, we have developed an exploding pusher platform for use at the NIF in the polar-direct-drive configuration. The baseline design employs a 3 mm-diameter capsule, an 18 μm-thick CH ablator, and Ar-doped D2 gas to achieve several keV electron-ion temperature separations with relatively low convergence ratios. In an initial series of shots at the NIF—N160920–003, -005, and N160921–001—the ratio of the laser intensity at different polar angles was varied to optimize the symmetry of the implosion. Here we summarize experimental results from the shot series and present pre- and post-shot analysis. Although the polar-direct-drive configuration is inherently asymmetric, we successfully tuned a post-shot 1D model to a set of key implosion performance metrics. The post-shot model has proven effective for extrapolating capsule performance to higher incident laser drive. Overall, the simplicity of the platform and the efficacy of the post-shot 1D model make the polar-direct-drive exploding pusher platform attractive for a variety of applications beyond the originally targeted study of collisional processes in high-energy-density plasmas.
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