Una tipología de casos para enseñar la administración

Objetivo principal de este artículo es proponer una tipología de casos de enseñanza útil para estudiarel impacto del método de casos sobre el aprendizaje. Con base en la teoría de clasificación y la teoríaconstructivista se diseña la clasificación que sirve para construir la tipología. Se identifican y se caracterizanlos tipos ideales de casos. La tipología propuesta está libre de los defectos de las taxonomíasexistentes y puede ser usada en los estudios de impacto del método de casos sobre el aprendizaj

Chemical Detection of Short-Lived Species Induced in Aqueous Media by Atmospheric Pressure Plasma

Non-thermal atmospheric pressure plasmas are widely used in biomedical research and clinical applications. Such plasmas generate a variety of reactive oxygen and nitrogen species upon interaction with ambient surroundings. These species further interact with a biological substrate and are responsible for the biomedical effects of plasma. Liquid water is an essential part of any biological systems. Some of the most reactive species induced by plasma in aqueous media are radicals and atoms. Hence, the presence of certain chemical components in a plasma ‘cocktail’ presents an important task for both understanding and further development of plasma systems with specific purposes. In this chapter, we discuss various methods of detection of the plasma-generated short-lived reactive species. We dissert various plasma-induced radicals and atoms (•OH, O2•−/•OOH, •NO, O), together with non-radical short-lived species (−OONO, O3, 1O2). Electron paramagnetic resonance (EPR) is the most direct method of radical detection in water-based media. Special attention is paid to the limitations of the detection methods, with an emphasis on spin trapping used in EPR analysis

Plasma-treated liquids in medicine: let's get chemical

Fundamental and applied research on plasma-treated liquids for biomedical applications was boosted in the last few years, dictated by their advantages with respect to direct treatments. However, often, the lack of consistent analysis at a molecular level of these liquids, and of the processes used to produce them, have raised doubts of their usefulness in the clinic. The aim of this article is to critically discuss some basic aspects related to the use of plasma-treated liquids in medicine, with a focus on their chemical composition. We analyze the main liquids used in the field, how they are affected by non-thermal plasmas, and the possibility to replicate them without plasma treatment.Peer ReviewedObjectius de Desenvolupament Sostenible::3 - Salut i BenestarPostprint (published version

Sunspots, unemployment, and recessions, or Can the solar activity cycle shape the business cycle?

Over the last 77 years (from 1935), all 7 cyclical maximums of the solar activity overlapped closely with the US recessions, thus predicting (or triggering?) 8 out of 13 recessions officially identified by NBER (including one “double-deep” recession). Over the last 64 years (from 1948), all 6 maximums of the solar activity were preceded by minimums of the US unemployment rate, and the spikes in the unemployment rate followed with lags of 2-3 years. On the world scale, over the last 44 years (for which the data is available), all 4 maximums of the solar activity overlapped with minimums of the unemployment rate in the G7 countries, followed by its spikes within 2-3 years. From 1965, when consistent recession dating is available for all G7 countries, nearly 3/5 of the recessions started in the 3 years around and after the sunspot maximums. Was it a mere coincidence or a part of a broader pattern? This paper explores the correlation between the solar activity cycles (as measured by the number of sunspots on the sun surface) and the timing of recessions in the US and other economies. It finds out that the probability of recessions in G7 countries greatly increased around and after the solar maximums, suggesting that they can cause deterioration in business conditions and trigger recessions. This opens new approach for projecting recessions, which can be applied and tested with regard to the next solar maximum in 2013. Caution: This research is not in the “mainstream” of the economic thought. Read at your own risk

Can solar activity influence the occurrence of economic recessions?

This paper revisits evidence of solar activity influence on the economy. We examine whether economic recessions occur more often in the years around and after solar maximums. This research strand dates back to late XIX century writings of famous British economist William Stanley Jevons, who claimed that “commercial crises” occur with periodicity matching solar cycle length. Quite surprisingly, our results suggest that the hypothesis linking solar maximums and recessions is well anchored in data and cannot be easily rejected

Can solar activity influence the occurrence of economic recessions?

This paper revisits evidence of solar activity influence on the economy. We examine whether economic recessions occur more often in the years around and after solar maximums. This research strand dates back to late XIX century writings of famous British economist William Stanley Jevons, who claimed that “commercial crises” occur with periodicity matching solar cycle length. Quite surprisingly, our results suggest that the hypothesis linking solar maximums and recessions is well anchored in data and cannot be easily rejected

Una tipología de casos para enseñar la administración

Objetivo principal de este artículo es proponer una tipología de casos de enseñanza útil para estudiarel impacto del método de casos sobre el aprendizaje. Con base en la teoría de clasificación y la teoríaconstructivista se diseña la clasificación que sirve para construir la tipología. Se identifican y se caracterizanlos tipos ideales de casos. La tipología propuesta está libre de los defectos de las taxonomíasexistentes y puede ser usada en los estudios de impacto del método de casos sobre el aprendizaj

Sunspots, unemployment, and recessions, or Can the solar activity cycle shape the business cycle?

Over the last 77 years (from 1935), all 7 cyclical maximums of the solar activity overlapped closely with the US recessions, thus predicting (or triggering?) 8 out of 13 recessions officially identified by NBER (including one “double-deep” recession). Over the last 64 years (from 1948), all 6 maximums of the solar activity were preceded by minimums of the US unemployment rate, and the spikes in the unemployment rate followed with lags of 2-3 years. On the world scale, over the last 44 years (for which the data is available), all 4 maximums of the solar activity overlapped with minimums of the unemployment rate in the G7 countries, followed by its spikes within 2-3 years. From 1965, when consistent recession dating is available for all G7 countries, nearly 3/5 of the recessions started in the 3 years around and after the sunspot maximums. Was it a mere coincidence or a part of a broader pattern? This paper explores the correlation between the solar activity cycles (as measured by the number of sunspots on the sun surface) and the timing of recessions in the US and other economies. It finds out that the probability of recessions in G7 countries greatly increased around and after the solar maximums, suggesting that they can cause deterioration in business conditions and trigger recessions. This opens new approach for projecting recessions, which can be applied and tested with regard to the next solar maximum in 2013. Caution: This research is not in the “mainstream” of the economic thought. Read at your own risk