Hurricanes and labor market outcomes: Evidence for Mexico     

Eduardo Rodríguez-Oreggia 《Global Environmental Change》2013,23(1):351-359

Hurricanes are becoming frequent events that affect more people every time, and in this context the identification of the effects on the labor market may be important for the policy design of mechanisms to cope more effectively with these shocks. Using hurricanes as exogenous shocks and with microdata from 32 metropolitan areas in Mexico from 2000 to 2011, we analyze the effect on the returns for skill levels, hours worked and jobs with access to social security. Results show that the impact seems to be mostly positive on wages and formal jobs for low educated workers. There is no specific pattern of results for intensity of the hurricanes.  相似文献   

Multivariate Analysis in Hydrochemistry: An Example of the Use of Factor and Correspondence Analyses   总被引：7，自引：0，他引：7  

Eduardo J. Usunoff  Amado Guzmán-Guzmán 《Ground water》1989,27(1):27-34

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Personal Narratives as Interactive Texts: Collecting and Interpreting Migrant Life-Histories*     

Miranda Miles  Jonathan Crush 《The Professional geographer》1993,45(1):84-94

Life-history or personal narrative techniques have considerable potential as a way of recovering hidden histories, contesting academic androcentrism, and reinstating the marginalized and dispossessed as makers of their own past. Drawing on a large methodological literature on life-history collection, and applications of these techniques in Africa, we argue that geographers might explore these methodologies as a means of recovering lost geographies and venting alternative voices in academic texts. Drawing on our own project on Swazi migrant women, we suggest that life-histories cannot, however, be seen purely as vehicles for the delivery of uncontaminated fact about the past. Rather personal narratives should be viewed and interpreted as interactive texts. This leads us to a consideration of a number of methodological and interpretive issues surrounding life-history collection: the positional advantages of insider status, the “terrible assymetries” of the interview process, and the power (and pitfalls) of narrative forms of representation.  相似文献   

Evaluation of magmatic processes for the products of the Nevado del Ruiz Volcano, Colombia from geochemical and petrological data     

Nicole Vatin-Prignon  Pierre Goemans  Richard A. Oliver  Eduardo Parra Palacio 《Journal of Volcanology and Geothermal Research》1990,41(1-4)

Trace-element concentrations of the eruptive products from the Nevado del Ruiz volcano indicate that at least for the last 1 Ma, the major controlling factor in the evolution of the magma has been a simple fractional crystallization.The Zr/Hf ratios suggest that the source material is mantle-like in origin and whilst subduction-related contamination of the source material has taken place, there is no evidence that assimilation of continental crust has affected the series.No convincing geochemical evidence for magma mixing was found, and data on banded pumices of Pleistocene, Historic and the 1985 eruptions strongly support a crystal fractionation model to explain the compositional variation of their glasses. Therefore, if mixing has taken place it can only be a mixing of layers within a stratified or partially stratified magma chamber.Modeling of fractional crystallization using a stepwise program has been undertaken and least-squares approximations with small residuals are commensurate with analyzed samples. Crystal fractionation models with plagioclase dominating two-pyroxenes and iron oxides give good fits for all calculations. We conclude that simple crystal fractionation is the process most consistent with major- and trace-element variations in the Ruiz series. This closed-system model requires at least 77% crystal fractionation of a basaltic parent to generate the observed compositions of dacites.  相似文献   

Stochastic response of rigid foundations     

Artur Luna Pais  Eduardo Kausel 《地震工程与结构动力学》1990,19(4):611-622

While the study of kinematic interaction (i.e. the dynamic response of massless foundations to seismic loads) calls, in general, for advanced analytical and numerical techniques, an excellent approximation was proposed recently by Iguchi.^1,2 This approximation was used by the authors to analyse embedded foundations subjected to spatially random SH-wave fields, i.e. motions that exhibit some degree of incoherence. The wave fields considered ranged from perfectly coherent motions (resulting from seismic waves arriving from a single direction) to chaotic motions, resulting from waves arriving simultaneously from all directions. Additional parameters considered were the shape of the foundation (cylindrical or rectangular) and the degree of embedment. It was found that kinematic interaction usually reduces the severity of the motions transmitted to the structure, and that incoherent motions do not exhibit the frequency selectivity (i.e. narrow valleys in the foundation response spectra) that coherent motions do.  相似文献   

Reply by authors to M. D. Trifunac     

Eduardo Reinoso  Mario Ordaz And  Francisco J. Sanchez-Sesma 《地震工程与结构动力学》1991,20(8):804-804

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On the effect of the rigid sidewall on the dynamic stiffness of embedded circular footings     

John L. Tassoulas  Eduardo Kausel 《地震工程与结构动力学》1983,11(3):403-414

The effect of the rigid sidewall, which is usually combined with embedded footings, on the dynamic stiffness of the footings is considered. An efficient numerical technique is used to calculate the static and dynamic stiffness of circular footings embedded in a stratum. The results show that the increase in static stiffness with increasing height of the sidewall is most significant in the case of rocking. The dynamic stiffness coefficients change considerably, if the sidewall extends higher than about half the depth of embedment. The damping coefficients corresponding to vertical vibrations and rocking are likewise affected by the height of the sidewall. The damping coefficients corresponding to torsional and horizontal vibrations increase considerably with increasing height of the sidewall.  相似文献   

Coastal processes and environmental hazards: the Buenos Aires (Argentina) and Venetian (Italy) littorals   总被引：1，自引：0，他引：1  

Jorge Pousa  Luigi Tosi  Eduardo Kruse  Dardo Guaraglia  Maurizio Bonardi  Andrea Mazzoldi  Federica Rizzetto  Enrique Schnack 《Environmental Geology》2007,51(8):1307-1316

The Buenos Aires (Argentina) and Venice (Italy) coastlands have experienced significant saltwater contamination of the phreatic aquifer, coastal erosion, hydrodynamic changes and relative sea level rise processes due to natural and man-induced factors. These factors expose coastal areas to morpho-hydro-geological hazards, such as soil desertification, frequency and degree of flooding, littoral erosion, and the silting of river mouths and channels. Man-made interventions and actions, such as beach mining, construction of coastal structures and exploitation of aquifers without an adequate knowledge of the hydrology setting and an adequate management program, worsen these natural hazards. Uncontrolled human activity induces environmental damage to the overall coastal plains. The coastal plains play an important role in the social/economic development of the two regions based on land use, such as agriculture, horticulture, breeding, and tourism, as well as industry. Results of investigations on saltwater contamination, sea level rise and morphological changes recently performed in these two coastal areas are presented here.  相似文献   

Morphology of the Itapeva to Tramandai transgressive dunefield barrier system and mid‐ to late Holocene sea level change     

Patrick A. Hesp  Sergio Rebello Dillenburg  Eduardo Guimaraes Barboza  Luiz C. P. Clerot  Luiz J. Tomazelli  Ricardo Norberto Ayup Zouain 《地球表面变化过程与地形》2007,32(3):407-414

The surface morphology of the transgressive dunefield barrier extending from Itapeva to Tramandai along the northern littoral of Rio Grande do Sul, is examined and an attempt is presented to link morphological changes across the barrier to Holocene sea level changes. The 4·5 km wide Holocene barrier displays two typical morphologies: an inner part dominated by large‐scale, continuous alongshore, overlapping dunefield phases comprising sand sheets, dunes, deflation plains and precipitation ridges; and an outer part dominated by discontinuous, medium‐ to small‐scale, triangular to lobate transgressive dunefield phases, cut by both active and relict (palaeo‐) creeks or washouts. Holocene sea level in the region rose to c. +1 to +3 m above present reaching a maximum around 5100 years bp and then progressively fell to the present level. We argue that the effect on barrier development was to suppress the development of a drainage system during the rising and maximum stages, and encourage the development of an organized drainage system in the form of regularly spaced washouts during the falling period, and that this change in sea level from rising to falling therefore produced the large‐scale differences in barrier morphology. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

The meromictic Lake La Cruz (Central Spain). Patterns of stratification     

María A. Rodrigo  María R. Miracle  Eduardo Vicente 《Aquatic Sciences - Research Across Boundaries》2001,63(4):406-416

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