Aprendre economia des del més proper : construcció d'un índex de preus. 'Aprender economía desde lo más cercano : construcción de un índice de precios'.

Resumen de la autora en catalán

Estratègies per un ensenyament-aprenentatge viu i proper. 'Estrategias para una enseñanza-aprendizaje viva y cercana'.

Resumen de las autoras en catalán

Reliability, sufficiency, and the decomposition of proper scores

Scoring rules are an important tool for evaluating the performance of probabilistic forecasting schemes. A scoring rule is called strictly proper if its expectation is optimal if and only if the forecast probability represents the true distribution of the target. In the binary case, strictly proper scoring rules allow for a decomposition into terms related to the resolution and the reliability of a forecast. This fact is particularly well known for the Brier Score. In this article, this result is extended to forecasts for finite-valued targets. Both resolution and reliability are shown to have a positive effect on the score. It is demonstrated that resolution and reliability are directly related to forecast attributes that are desirable on grounds independent of the notion of scores. This finding can be considered an epistemological justification of measuring forecast quality by proper scoring rules. A link is provided to the original work of DeGroot and Fienberg, extending their concepts of sufficiency and refinement. The relation to the conjectured sharpness principle of Gneiting, et al., is elucidated.

Proper evaluation of the external convective heat transfer for the thermal analysis of cool roofs

Cool materials are characterized by high solar reflectance and high thermal emittance; when applied to the external surface of a roof, they make it possible to limit the amount of solar irradiance absorbed by the roof, and to increase the rate of heat flux emitted by irradiation to the environment, especially during nighttime. However, a roof also releases heat by convection on its external surface; this mechanism is not negligible, and an incorrect evaluation of its entity might introduce significant inaccuracy in the assessment of the thermal performance of a cool roof, in terms of surface temperature and rate of heat flux transferred to the indoors. This issue is particularly relevant in numerical simulations, which are essential in the design stage, therefore it deserves adequate attention. In the present paper, a review of the most common algorithms used for the calculation of the convective heat transfer coefficient due to wind on horizontal building surfaces is presented. Then, with reference to a case study in Italy, the simulated results are compared to the outcomes of a measurement campaign. Hence, the most appropriate algorithms for the convective coefficient are identified, and the errors deriving by an incorrect selection of this coefficient are discussed.

Lorentz violation and the proper-time method

In this Letter, we apply the proper-time method to generate the Lorentz-violating Chern-Simons terms in the four-dimensional Yang-Mills and non-linearized gravity theories. It is shown that the coefficient of the induced Chern-Simons term is finite but regularization dependent. (C) 2008 Elsevier B.V. All rights reserved.

Directors' duty to use their powers for proper or permissable purposes

This article focuses generally on the interaction among several internal company law doctrines such as the supremacy of the articles of association; that other organs cannot interfere with powers exclusively conferred upon a particular organ; that courts will not readily interfere with internal company matters; that directors are under a duty to act in good faith and in the best interest of the company as a whole and under a duty to use their powers for proper or permissible purposes; and that there are some remedies available to shareholders if directors did not perform their powers for a proper or permissible purpose. The specific aim with the article is to establish when and why the courts will be prepared to set aside decisions by directors if they have taken them for an improper or impermissible purpose. The article concludes that the courts will be prepared to set the decisions of directors aside when they have used a particular power substantially or primarily for an improper or impermissible purpose. When the exercise of directors' powers is challenged under circumstances where there were both permissible and impermissible purposes for exercising a particular power, there is no alternative for the court but to inquire into the complex area of the state of mind of those who acted and the motive on which they acted. This is, in fact, second-guessing the decisions of directors.

Corporate donations, the best interest of the company and the proper purpose doctrine

Corporate philanthropy is illegitimate spending by powerful corporate elite of someone else’s money; an attempt to bypass democratic allocation of taxes; philanthropy by individuals is laudable, but not by corporations.

Just as I wouldn’t want you to implement your personal judgments by writing checks on my bank account for charities of your choice, I feel it inappropriate to write checks on your corporate ‘bank account’ for the charities of my choice.

Avoiding the Fog of Crisis: A Protocol for the Proper Domestic Use of the Military

Failure to contemplate and define an appropriate role for the armed forces of the national government in domestic crises of this sort is a serious problem. It is all the more serious now as these potential crises seem to multiply in character and scope. This thesis will explore the history of this problem and its recent implications. It will argue the need for a comprehensive, operational framework, codified in law, which defines the various alternative uses of all emergency services, both civilian and military, and is applicable to “all hazards.” I will attempt to provide a blue-print for what such a framework should look like.

‘It would be okay if they came through the proper channels’: community perceptions and attitudes toward asylum seekers in Australia

Australia's humanitarian programme contributes to UNHCR's global resettlement programme and enhances Australia's international humanitarian reputation. However, as the recent tragedy on Christmas Island has shown, the arrival of asylum seekers by boat continues to stimulate debate, discussion and reaction from the Australian public and the Australian media. In this study, we used a mixed methods community survey to understand community perceptions and attitudes relating to asylum seekers. We found that while personal contact with asylum seekers was important when forming opinions about this group of immigrants, for the majority of respondents, attitudes and opinions towards asylum seekers were more influenced by the interplay between traditional Australian values and norms, the way that these norms appeared to be threatened by asylum seekers, and the way that these threats were reinforced both in media and political rhetoric.

Model updating of the non-linear vibrating structures through Volterra series and proper orthogonal decomposition

Classical procedures for model updating in non-linear mechanical systems based on vibration data can fail because the common linear metrics are not sensitive for non-linear behavior caused by gaps, backlash, bolts, joints, materials, etc. Several strategies were proposed in the literature in order to allow a correct representative model of non-linear structures. The present paper evaluates the performance of two approaches based on different objective functions. The first one is a time domain methodology based on the proper orthogonal decomposition constructed from the output time histories. The second approach uses objective functions with multiples convolutions described by the first and second order discrete-time Volterra kernels. In order to discuss the results, a benchmark of a clamped-clamped beam with an pre-applied static load is simulated and updated using proper orthogonal decomposition and Volterra Series. The comparisons and discussions of the results show the practical applicability and drawbacks of both approaches.