Agronomic, economic and ecological aspects of the papaya (Carica papaya) production in Tabasco, Mexico

The cultivation of papaya is important in the tropic because it provides source of income to the farmer within a short time. Statistical data were obtained from farmers located in the Chontalpa, Rios and Centro-Sierra regions; the size of the survey was 67 farmers. The study shows the results of the farmers’ problem in a drastic reduction of their productivity because of the virosis and low prices in commercialization. The farmers were classified into three levels of technology, “low”, “middle” and “high”. The first one covers 88% of the farmers in seasonal conditions in contrast with the high technology that concentrates 4.5% in irrigation conditions. According to the technology used, the fertilizer shows more yields. Economically, the high technology had an internal tax return of 0.43 in comparison with the low technology of 0.25, which means that the investment is recovered with different yields. However, the use of high technology makes the system more competitive. Key words

Language and translation practices of Spanish-language newspapers published in the U.S. borderlands between 1808 and 1930

This article examines the impact of the anglicizing language policies implemented after the annexation of the U.S. borderlands to the United States on language use by describing the language and translation practices of Spanish-language newspapers published in the U.S. borderlands across different sociohistorical periods from 1808 to 1930. Sixty Hispanic-American newspapers (374 issues) from 1808 to 1980 were selected for analysis. Despite aggressive anglicizing legislation that caused a societal shift of language use from Spanish into English in most borderland states after the annexation, the current study suggests that the newspapers resisted assimilation by adhering to the Spanish language in the creation of original content and in translation

Shell beads of the Last Hunter-Gatherers and Earliest Farmers in South-Western Europe

This paper analyses the suspended objects of adornment made from marine mollusc shells that have been recorded at Mesolithic and Neolithic sites in southwest Europe. Particular attention will be given to taxonomic determination, technological aspects and the strategies utilised to obtain the raw materials for these objects. The distribution of certain species and the types of ornamentation used by the last hunter-gatherers and first farming communities will also be discussed

Bivariate orthogonal polynomials in the Lyskova class

AbstractClassical orthogonal polynomials in two variables can be characterized as the polynomial solutions of a matrix second-order partial differential equation involving matrix polynomial coefficients. In this work, we study classical orthogonal polynomials in two variables whose partial derivatives satisfy again a second-order partial differential equation of the same type

Semiclassical orthogonal polynomials in two variables

AbstractIn this work, semiclassical orthogonal polynomials in two variables are defined as the orthogonal polynomials associated with a quasi definite linear functional satisfying a matrix Pearson-type differential equation. Semiclassical functionals are characterized by means of the analogue of the structure relation in one variable. Moreover, non trivial examples of semiclassical orthogonal polynomials in two variables are given

El Síndrome de "Burnout" o el desgaste profesional.

El término inglés "burnout", hace referencia a una disfunción psicológica que parece suceder de forma más común, entre los trabajadores cuya labor se realiza en relación directa con la gente. Es la consecuencia de altos niveles de tensión en el trabajo, frustración personal e inadecuadas actitudes de enfrentamiento a las situaciones conflictivas. Supone un coste personal, organizacional y social importantes. A través de este artículo hemos intentado hacer un acercamiento a este síndrome, exponiendo sus principales características, así como los modelos teóricos que aportan una explicación y las variables estudiadas que parecen contribuir a su aparición. Por último hemos realizado una breve exposición sobre los resultados de los estudios sobre el "burnout" en diversas profesiones