The paper presents an analysis of the value form based in ideas of metric spaces and symmetry preserving operations in these spaces. This is related to the concept of symmetry in systems governed by conservation laws.

In this study we investigate the time-scale at which NAO and ENSO are associated with the precipitation in Galicia (Northwestern of Spain), looking for possible climate predictors. The existence of preferred frequencies in all series was analyzed by using SS…

How might development influence and be influenced by domestic service? Part I poses potential connections between the two phenomena, followed by general trends in the domestic service industry. Characteristics of domestic servants and service are discussed in Part II. Part…

In this work we report measurements of atmospheric pollutants in Puebla City, including those registered during the period characterized by intense volcanic activity from Popocatépetl volcano between December 2000 and January 2001. We used a gaussian air dispersion model to…

During the last decade of the 20th Century, diverse campaigns for measuring the atmospheric energy balance were performed in downtown México City (School of Mines and Preparatory School No. 7), in the southern suburbs (University Reserve) and in the surrounding…

Precipitation zone systems exist for México based on seasonality, quantity of precipitation, climates and geographical divisions, but none are convenient for the study of the relation of precipitation with phenomena such as El Niño. An empirical set of seven exclusively…

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