Consequences of adolescent's evening preference on psychological functioning: a review

This review provides an overview of the role of circadian preference in psychological functioning of adolescents taking into account their shift to eveningness during this stage of life. After a brief explanation about morningness/eveningness and other terms related, an overview of the changes that occur on three of the most important areas in the adolescent‟s life is presented: school performance, personality styles, and health. Consequences of evening preference on school achievement are considered from the analysis of the relevance of sleep debt and time-of-day in cognition and mood aspects. In general, students who are able to choose activity times coinciding with their preferred times may have a greater opportunity to optimize their performance. The personality styles and health of morning and evening types are also important factors related to school and family adaptation. At last, some recommendations and conclusions in order to promote a healthy psychological functioning are described.

Nonclassical light revealed by the joint statistics of simultaneous measurements

Nonclassicality cannot be a single-observable property, since the statistics of any quantum observable is compatible with classical physics. We develop a general procedure to reveal nonclassical behavior of light states from the joint statistics arising in the practical measurement of multiple observables. Beside embracing previous approaches, this protocol can disclose nonclassical features for standard examples of classical-like behavior, such as SU(2) and Glauber coherent states. When combined with other criteria, this would imply that every light state is nonclassical.

US Antidumping Petitions and Revealed Comparative Advantage of Shrimp Exporting Countries

The paper explores the trade competitiveness of seven major shrimp exporting countries, namely Vietnam, China, Thailand, Ecuador, India, Indonesia and Mexico, to the USA. Specifically, we investigate whether the United States (US) antidumping petitions impact upon the bilateral revealed comparative advantage (RCA) indexes for each of the seven shrimp exporting countries with the USA. Monthly data from January 2003 to December 2014 and the panel data model are used to examine the determinants of the RCA for the shrimp exporting countries. The empirical results show the shrimp exporting countries have superior competitiveness against the shrimp market in the USA. Moreover, the RCA indexes are significantly negatively influenced by shrimp prices, and are positively affected by US income per capita. However, the EMS (Early Mortality Syndrome) shrimp disease, domestic US shrimp quantity, exchange rate, and US antidumping laws are found to have no significant impacts on the RCA indexes. In terms of policy implications, the USA should try to reduce production costs of shrimp in the US market instead of imposing antidumping petitions, and the shrimp exporting countries should maintain their comparative advantage and diversify into new markets.