DSpace community: Universitat de Barcelona

Foreign migrations and new couples in Spain. Nuptiality and Gender Imbalance in the new century

Sat, 28 Jun 2008 22:58:59 GMT

title: Foreign migrations and new couples in Spain. Nuptiality and Gender Imbalance in the new century authors: Sarrible, Graciela D.
abstract: Nuptiality is not a central item in Migration Research now. In the past, especially for American countries, many scholars were really interested in marriages of immigrants, specially knowing the exchanges between different communities; that is, mixed marriages. Here is the Spanish case in nuptiality between foreign and local people.

Movimientos sociales e identificación demográfica de sujetos étnicos: una mirada desde Argentina

Fri, 08 Aug 2008 10:18:57 GMT

title: Movimientos sociales e identificación demográfica de sujetos étnicos: una mirada desde Argentina authors: Sarrible, Graciela D.
abstract: Contar a las personas que forman grupos o subpoblaciones no es un proceso neutro. Se ha reconocido que está condicionado por factores sociales. El relativo reciente interés de las autoridades de diversos países por conocer con más exactitud sus poblaciones nativas, con el fin de definir y llevar a cabo políticas concretas, ha dado como resultado un tratamiento específico en el recuento y cuantificación de estas poblaciones y la incorporación de preguntas censales, así como la realización de encuestas especiales para poder conocer estos grupos. Desde hace años y como consecuencia de una política de corrección, se ha optado por la autoidentificación como método para incorporar a los individuos en los diversos grupos de adscripción; o sea, la declaración del individuo sobre su pertenencia o no al grupo. Esto ha provocado algunos problemas, pero básicamente, se ha considerado la mejor opción. La hipótesis de este trabajo pone en relación al menos dos procesos que interactúan en una relación positiva de incremento. Por una parte, se reconoce un incremento de sujetos que no puede obedecer a los componentes del crecimiento de la población (e.j. migración). Por la otra, más personas se reconocen como indígenas. En un proceso de retro-alimentación, el reconocimiento de sus derechos y la realización de planes específicos, se acompaña de un incremento en la identificación de los individuos con el grupo. En este trabajo, se toma como ejemplo la evolución de las mediciones de los pueblos indígenas en la República Argentina. Cuando se explotaron los resultados del Censo del 2001, que ha vuelto a incorporar la pregunta, se pudo construir una muestra y realizar la Encuesta Complementaria de pueblos indígenas (ECPI) cuyos resultados han sido publicados. Los objetivos de este trabajo serían, en primer lugar, constatar el crecimiento de los efectivos, más allá de los factores demográficos usuales. En segundo lugar, analizar los resultados en la ECPI (2004-05) sobre cuestiones como pertenencia, descendencia y autoidentificación.

Spectral analysis of the luteinizing hormone in the blood samples

Tue, 05 Aug 2008 10:36:13 GMT

title: Spectral analysis of the luteinizing hormone in the blood samples authors: Liutsko, Liudmila
abstract: Generally, medicine books are concentrated almost exclusively in explaining methodology that analyzes fixed measures, measures done in a certain moment, nevertheless the evolution of the measurement and correct interpretation of the missed values are very important and sometimes can give the key information of the results obtained. Thus, the analysis of the temporary series and spectral analysis or analysis of the time series in the dominion of frequencies can be regarded as an appropriate tool for this kind of studies. In this work the frequency of the pulsating secretion of luteinizing hormone LH (that regulates the fertile life of women) were analyzed in order to determine the existence of the significant frequencies obtained by analysis of Fourier. Detection of the frequencies, with which the pulsating secretion of the LH takes place, is a quite difficult question due to presence of the random errors in measures and samplings, i.e. that pulsating secretions of small amplitude are not detected and disregarded. In physiology it is accepted that cyclical patterns in the secretion of the LH exist and in the results of this research confirm this pattern and determine its frequency presented in the corresponded periodograms to each of studied cycle. The obtained results can be used as key pattern for future sampling frequencies in order to “catch” the significant picks of the luteinizing hormone and reflect on time for productivity treatment of women.

What trees tell us: dendrochronological and statistical analysis of the data

Tue, 05 Aug 2008 10:19:36 GMT

title: What trees tell us: dendrochronological and statistical analysis of the data authors: Liutsko, Liudmila
abstract: Trees are a great bank of data, named sometimes for this reason as the “silent witnesses” of the past. Due to annual formation of rings, which is normally influenced directly by of climate parameters (generally changes in temperature and moisture or precipitation) and other environmental factors; these changes, occurred in the past, are “written” in the tree “archives” and can be “decoded” in order to interpret what had happened before, mainly applied for the past climate reconstruction. Using dendrochronological methods for obtaining samples of Pinus nigra from the Catalonian PrePirineous region, the cores of 15 trees with total time spine of about 100 - 250 years were analyzed for the tree ring width (TRW) patterns and had quite high correlation between them (0.71 – 0.84), corresponding to a common behaviour for the environmental changes in their annual growth. After different trials with raw TRW data for standardization in order to take out the negative exponential growth curve dependency, the best method of double detrending (power transformation and smoothing line of 32 years) were selected for obtaining the indexes for further analysis. Analyzing the cross-correlations between obtained tree ring width indexes and climate data, significant correlations (p<0.05) were observed in some lags, as for example, annual precipitation in lag -1 (previous year) had negative correlation with TRW growth in the Pallars region. Significant correlation coefficients are between 0.27- 0.51 (with positive or negative signs) for many cases; as for recent (but very short period) climate data of Seu d’Urgell meteorological station, some significant correlation coefficients were observed, of the order of 0.9. These results confirm the hypothesis of using dendrochronological data as a climate signal for further analysis, such as reconstruction of climate in the past or prediction in the future for the same locality.