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Search Results: 1 - 10 of 246339 matches for " Luis C. Alatorre "
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Spatial and Temporal Evolution of the Static Water Level of the Cuauhtemoc Aquifer during the Years 1973, 1991 and 2000: A Geographical Approach  [PDF]
Luis C. Alatorre, Rolando E. Díaz, Sonia Miramontes, Luis C. Bravo, Erick Sánchez
Journal of Geographic Information System (JGIS) , 2014, DOI: 10.4236/jgis.2014.65047
Abstract: In hydrogeology it is of great interest to examine the temporal and spatial evolution of aquifers. There are different ways of modeling an aquifer: physical models, models based on analog and mathematical techniques. Usually, mathematical techniques involve complex operations difficult to understand for some people, such as differential or partial equations. In contrast, our method requires only a basic knowledge of geometry and trigonometry. Moreover, it is only necessary to know the static level of the aquifer at three different dates. Of course, the results may be limited compared to those that use advanced mathematical methods; however, our method provides a first approximation to determine the behavior of the aquifer through time. Overall, our results allowed us to follow the evolution of the aquifer in detail of various areas of increased extraction and in which removal has been increasing, but also of areas with a considerable recharge during the study period.
Identification of Mangrove Areas by Remote Sensing: The ROC Curve Technique Applied to the Northwestern Mexico Coastal Zone Using Landsat Imagery
Luis C. Alatorre,Raquel Sánchez-Andrés,Santos Cirujano,Santiago Beguería,Salvador Sánchez-Carrillo
Remote Sensing , 2011, DOI: 10.3390/rs3081568
Abstract: In remote sensing, traditional methodologies for image classification consider the spectral values of a pixel in different image bands. More recently, classification methods have used neighboring pixels to provide more information. In the present study, we used these more advanced techniques to discriminate between mangrove and non?mangrove regions in the Gulf of California of northwestern Mexico. A maximum likelihood algorithm was used to obtain a spectral distance map of the vegetation signature characteristic of mangrove areas. Receiver operating characteristic (ROC) curve analysis was applied to this map to improve classification. Two classification thresholds were set to determine mangrove and non-mangrove areas, and two performance statistics (sensitivity and specificity) were calculated to express the uncertainty (errors of omission and commission) associated with the two maps. The surface area of the mangrove category obtained by maximum likelihood classification was slightly higher than that obtained from the land cover map generated by the ROC curve, but with the difference of these areas to have a high level of accuracy in the prediction of the model. This suggests a considerable degree of uncertainty in the spectral signatures of pixels that distinguish mangrove forest from other land cover categories.
Are Tent Cities an Illusion of Success? Clients’ Perceptions of Neoliberalism Strategies  [PDF]
Francisco J. Alatorre
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.411010
Abstract:
The term, neoliberalism has been used to describe the overarching political and economic framework in which services for the poor living outside institutional life has operated for roughly the past 30 years. This implies a unified intent to “manage the poor” to benefit the larger society, in particular the business sector and the wealthy which are the key actors in society according to neoliberal doctrine. This paper explores and questions the conventional ideology of “managing the poor” and thus inquires further about the identified objectives of such management: whether such programs are intended to help the homeless re-establish themselves or prevent them from impinging on the wealthier classes. This questioning is done by reporting on and analyzing the experiences of twenty homeless people who are currently being “managed” by services provided by the agency Mesilla Valley Community of Hope (MVCH) in Las Cruces, New Mexico. This agency, reflecting Neoliberal doctrines, has created and manages a tent city which provides services for people who are homeless and near homeless. These services include showers, laundry, mail, voice mail, phone, lockers, case management, training programs, and donated goods, including clothing, shoes, hygiene products and household goods. MVCH also has various housing programs including transitional and permanent housing for people who are homeless. The findings derived from the interviewed participants reveal that “the managed” provide a contrasting view with those who assess neoliberalism practices as only benefiting society.
Analysis of the Temporal and Spatial Evolution of Recovery and Degradation Processes in Vegetated Areas Using a Time Series of Landsat TM Images (1986-2011): Central Region of Chihuahua, Mexico  [PDF]
L. C. Alatorre, E. Sánchez, J. P. Amado, L. C. Wiebe, M. E. Torres, H. L. Rojas, L. C. Bravo, E. López, E. López
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.52016
Abstract: This paper analyzed the temporal and spatial evolution of vegetation dynamics in various land covers in the basin of the Laguna Bustillos, Region of Cuauhtémoc, Chihuahua, Mexico. We used an NDVI time series for the months of March to April (early spring). The series was constructed from Landsat TM images for the period 1986-2011. The results show an increase of NDVI for vegetated areas, especially in conifer cover, while shrub and grassland showed a positive trend but with lower statistical significance. The increase in minimum temperatures in early spring, during the study period, was the most important factor in explaining the increase of NDVI in vegetated areas. A spatially distributed analysis shows large areas without an NDVI trend, corresponding to areas with sparse vegetation cover (degraded areas). Moreover, there are also areas with a negative trend (loss of vegetation), explained by the exploitation of trees to produce firewood which is mainly carried out by the ejidos in the region. These results help to focus human and financial resources in places where the benefit will be greatest.
L’Art du détour selon Shakespeare : les déviations de Troilus and Cressida, d’Othello et de The Tempest Interpretative Deviations in Shakespeare’s Troilus and Cressida, Othello, and The Tempest
Sophie Alatorre
Revue LISA / LISA e-journal , 2009, DOI: 10.4000/lisa.393
Abstract: If Shakespeare’s Renaissance contemporaries were keen on efficiency and “progress” (in the sense of “onward movement in space”), they also particularly enjoyed labyrinthine ways which distracted them from their primary purposes. I therefore propose to explore the deviations in three very different plays: Shakespeare’s Troilus and Cressida (1602), Othello (1603-1604) and The Tempest (1611). Keeping in mind that “to discourse” first meant “to run, move, or travel over a space”, today’s readers and spectators can still examine the twists and turns of seductive Shakespearean discourses pervaded by irregularities, amplification, irony and perversion. But not only is the dramatic world of the Elizabethan and Jacobean era based on stylistic erring, it is also deeply rooted in the art of perspective: we are continually made to change our points of view when we probe Shakespeare’s universes, teeming with deviant characters. Indeed, a labyrinthine scene necessarily echoes a problematic text. Oblique strategies are thus used by the playwright to generate extra-ordinary emotions: weaving a dramatic web to ensnare the spectators, Shakespeare creates a subversive art which fascinates precisely because of its refusal to follow well-traced, ordinary paths. Either in real life or on stage, only unexpected meanders can provoke men’s amazement…
Christopher R. Fee & David A. Leeming. Gods, Heroes, and Kings. The Battle for Mythic Britain
Sophie ALATORRE
E-rea : Revue électronique d’études sur le Monde Anglophone , 2006,
Abstract: A reassessment of British mythology has long been overdue, and Gods, Heroes and Kings is to be regarded as a stimulating contribution which helps to situate Anglo-Saxon tales in the mainstream of Medieval literature. Myths, pagan and Judeo-Christian beliefs, classical narratives: such vast material forms the backcloth Christopher F. Fee and David A. Leeming have undertaken to explore, thanks to an erudite comparative approach. Obviously, their book first aims at giving readers a new image of ...
An approach to Renaissance margins: some representations of the labyrinth on the Elizabethan stage
Sophie ALATORRE
E-rea : Revue électronique d’études sur le Monde Anglophone , 2008, DOI: 10.4000/erea.95
Abstract: Alors que la notion de centre, très liée à celle du pouvoir, a longtemps été au c ur des enjeux culturels, sociaux et littéraire, l’importance des marges, lieu métamorphique de transition et de différence, est désormais réhabilitée. Durant la Renaissance, l’espace marginal s’assimile fréquemment à celui du labyrinthe, figure mythique tant attractive que répulsive, ré-inventée et remaniée à l’envi comme tant d’autres mythes au cours du seizième siècle. Les textes de trois grands dramaturges que furent Marlowe, Peele et Shakespeare en témoignent : lorsqu’ils abordent des thèmes tels que la réclusion, l’intimité, la déviance ou les stratégies de l’oblique, l’image du labyrinthe est convoquée et permet de décrire une réalité marginale où la parole se délie et le regard critique se développe, et qui, insensiblement, se mue peu à peu vers le centre. On peut dès lors se demander si les méandres où évoluent les personnages ne constituent pas, dans une moindre mesure, une véritable passerelle vers le pouvoir : errer dans l’espace liminal des marges, à la Renaissance, revient aussi à conquérir une individualité et une liberté qu’il faut parfois payer au prix fort. C’est cette thématique féconde et complexe à la fois que nous nous proposons d’aborder dans cet article, en prenant appui sur les textes de l’époque, afin de mieux comprendre les sensibilités et les représentations des contemporains de Shakespeare.
Análisis de la evolución espacio-temporal del NDVI sobre áreas vegetadas y zonas de riesgo de erosión en el Pirineo Central
Alatorre, L. C.,Beguería, S.,Vicente-Serrano, S. M.
Pirineos : Revista de Ecología de Monta?a , 2010,
Abstract: The temporal evolution of vegetation activity on various land cover classes in the Spanish Pyrenees was analyzed. Two time series of the normalized difference vegetation index (NDVI) were used, corresponding to March (early spring) and August (the end of summer). The series were generated from Landsat TM and Landsat ETM+ images for the period 1984-2007. An increase in the NDVI in March was found for vegetated areas, and the opposite trend was found in both March and August for degraded areas (badlands and erosion risk areas). The rise in minimum temperature during the study period appears to be the most important factor explaining the increased NDVI in the vegetated areas. In degraded areas, no climatic or topographic variable was associated with the negative trend in the NDVI, which may be related to erosion processes taking place in these regions. En este trabajo se ha analizado la evolución temporal y espacial de la dinámica vegetal sobre varias coberturas de suelo en el Pirineo central, Espa a. Se han utilizado dos series temporales de NDVI, la primera corresponde al mes de Abril (inicio de primavera) y la segunda al mes de Agosto (final de verano). Las series fueron construidas a partir de imágenes Landsat TM y ETM+ para el periodo del 1984-2007. Los resultados muestran un incremento del NDVI en el mes de Marzo para las áreas vegetadas, mientras que las áreas degradadas (cárcavas y zonas de riesgo de erosión) presentaron una tendencia negativa del NDVI. El incremento de las temperaturas mínimas durante el periodo de estudio fue el factor más importante para explicar el incremento del NDVI en las áreas vegetadas. En las áreas degradadas, no se encontró ninguna variable climática o topográfica que explicará la tendencia negativa del NDVI, lo cual se ha relacionado con los procesos de erosión acelerada que tienen lugar en la región.
Soil erosion and sediment delivery in a mountain catchment under land use change: using point fallout 137Cs for calibrating a spatially distributed numerical model
L. C. Alatorre,S. Beguería,N. Lana-Renault,A. Navas
Hydrology and Earth System Sciences Discussions , 2011, DOI: 10.5194/hessd-8-11131-2011
Abstract: Soil erosion and sediment yield are strongly affected by land use/land cover (LULC). Spatially distributed erosion models are useful tools for comparing erosion resulting from current LULC with a number of alternative scenarios, being of great interest to assess the expected effect of LULC changes. In this study the soil erosion and sediment delivery model WATEM/SEDEM was applied to a small experimental catchment in the Central Spanish Pyrenees. Model calibration was carried out based on a dataset of soil redistribution rates derived from 137Cs inventories along three representative transects, allowing capture differences per land use in the main model parameters. Model calibration showed a good convergence to a global optimum in the parameter space. Validation of the model results against seven years of recorded sediment yield at the catchment outlet was satisfactory. Two LULC scenarios where then modeled to reproduce the land use at the beginning of the twentieth Century and a hypothetic future scenario, and to compare the simulation results to the current LULC situation. The results show a reduction of about one order of magnitude in gross erosion (3180 to 350 Mg yr 1) and sediment delivery (11.2 to 1.2 Mg yr 1 ha 1) during the last decades as a result of the abandonment of traditional land uses (mostly agriculture) and subsequent vegetation re-colonization. The simulation also allowed assessing differences in the sediment sources and sinks within the catchment.
Programa de gestión ambiental de sustancias tóxicas de atención prioritaria
Alatorre Rocío
Salud Pública de México , 1999,
Abstract:
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