Xalapa del Marqués y la presa Benito Juárez : un estudio de vida cotidiana

Trabajo terminal (Licenciatura en Sociología) - Universidad Autónoma Metropolitana, Unidad Azcapotzalco, División de Ciencias Sociales y Humanidades, Departamento de Sociología, 1997. 1 archivo PDF (60 páginas)Este trabajo trata sobre la vida cotidiana de un pueblo zapoteca de la región del istmo de Tehuantepec, en el Estado de Oaxaca, que a principios de la década de los sesenta sufrió un obligado reacomodo geográfico, luego que se construyera una presa en el territorio que ocupaba. De un momento a otro sus habitantes cambiaron su modo, ritmo y estilo de vida. Perdieron sus casas, sus tierras de cultivo, amplias zonas de caza y recolección de leña, los dos ríos que les proveían de agua y pesca abundante (además de un importante espacio de interacción), un templo y convento dominico del siglo XVI y, en fin, todo aquello que les daba vida y certidumbres. Hablamos de Xalapa del Marqués, un pueblo cuyo origen se remonta a más atrás del siglo XIV de la cuenta cristiana. El análisis se enfoca a tres ámbitos generales de la vida cotidiana de los xalapeños: economía, política y sociedad. UAMADCSHD

Logarithmic asymptotics of contracted Sobolev extremal polynomials on the real line

12 pages, no figures.-- MSC2000 codes: 41A60, 46E35.MR#: MR2271726 (2007h:41031)Zbl#: Zbl 1106.41031For a wide class of Sobolev type norms with respect to measures with unbounded support on the real line, the contracted zero distribution and the logarithmic asymptotic of the corresponding re-scaled Sobolev orthogonal polynomials is given.G. López, F. Marcellán, and H. Pijeira were supported by Ministerio de Ciencia y Tecnología of Spain under Grant BFM 2003-06335-C03-02. G. López and F. Marcellán were also partially supported by INTAS Research Network NeCCA INTAS 03-51-6637 and NATO PST.CLG.979738.Publicad

Geranium's response to compost based substrates

8 páginas, 2 figuras, 3 tablas, 10 referencias.-- International Symposium on Composting and use of Composted Materials for Horticulture, celebrado del 5-11 de abril 1997, en Ayr, Scotland, United Kingdom.The effects of compost based substrates on growth and nutrition of geranium (Pelargonium zonale cv Lucky Break F2) were investigated. Substrates of manure compost, cotton gin trash compost, municipal solid waste compost and pine bark utilized as potting media for domestic use, produced an underdevelopment of geranium plants with respect to the control. This behaviour is related to the inferior physical properties of the compost-based potting media, nitro gen immobilization due to the high C/N ratio of pine bark, and probably lack of available phosphorus originated by high calcium and high pH of the compost-based media. Nitrogen fertilization and a longer period of cultivation diminished the differences between plants grown in the control and in compost-based media. Plants grown in compost mixtures which were rich in K showed K and Ca leaf contents closer to the optimum range than did control plants.This work was supported by the Agencia de Medio Ambiente of the Junta de Andalucía and by Fertilizantes Orgánicos Melguizo, S. L.Peer reviewe

Nitrogen mineralization in soils amended with organic by-products of olive oil and sugarbeet processing industries

Mineralization of organic-N supplied te two different types of soils by an alpechín (olive-oil mill waste water)-compost and a beet vinasse after three consecutive years was studied. Results were compared with those obtained for a mineral fertilizer treatment and a control (unfertilized). N-mineralization can be described by a first order kinetic model. Both organic residues produced an important increase in me organic-N loading of the soils which is slowly released over a time.Peer Reviewe

Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete

This work develops the manufacture of self-compacting concrete (SCC) with 50% cement reduction. As an alternative binder to cement, the viability of using an alkali-activated combination of stainless steel slag (SSS) and fly ash (FA) has been demonstrated. SSS was processed applying three different treatments. Binders were manufactured mixing 35% SSS with 65% FA, as precursors, and a hydroxide activating solution. This binder was replaced by the 50% cement for the manufacture of SCC. The results obtained show good mechanical properties and durability. The study shows a reduction in the use of cement in the manufacture of SCC reusing two wastes

“To be, or not be… satisfied in NPOs”: a serial multiple mediation and clustering analysis of paid staff and volunteers' profiles

IntroductionNon-profit organizations (NPOs) are a complex working context whose main characteristic resides in the dichotomy between paid staff and volunteers. Despite its benefits for goal achievement, this circumstance can be also a challenge, for both groups' interaction, for their comprehension of their own role and to HR management. The aim of this study was to explore factors that may contribute to promote job satisfaction among NPOs' members.MethodsCombining two different data analyses, serial multiple mediation analyses and cluster analyses, first we analyze whether there are differences between paid staff and volunteers in perceived intrapersonal conflict and performance and its effect on job satisfaction, and second, we analyze whether there is an additional profiles distribution that reflects more adequately the reality of NPOs, despite the formal roles that coexist in these organizations (paid staff and volunteers).ResultsResults confirm that paid staff and volunteers differ on their perceived job satisfaction level, with volunteers being more satisfied. This relationship is serially mediated by role conflict, role ambiguity, and performance. Another characteristic of the NPOs is that the dichotomy between paid staff and volunteers does not capture well the reality of the labor relations between members of both groups and the organization. To explore this phenomenon, we perform a cluster analysis based on paid staff and volunteers' perceptions. Cluster analyses demonstrate the existence of three rather homogenous profiles.DiscussionAdditionally, practical implications for HR management in NPOs and future research lines to understand this organizational context dynamics are also discussed

Eco-Efficient Cement-Based Materials Using Biomass Bottom Ash: A Review

In recent years the use of biomass for electricity generation in thermal and cogeneration plants has increased worldwide because it is an environmentally clean fuel whose impact measured in greenhouse gas emissions is practically zero. However, biomass bottom ash, a waste produced during combustion, has also increased considerably, which has both a negative economic and environmental impact, due to landfill transport and management of this by-product. Although biomass bottom ash has potential characteristics for application in the manufacture of construction materials, its full-scale application is difficult because of the wide range in physicochemical properties, depending on the type of biomass burned, such as wood residue, olive waste, waste paper sludge, cocoa shell, etc., and the type of combustion process in the plant. This study reviews the influence on the physicochemical properties, mechanical behavior, and durability of different cement-based materials, such as mortars, concrete, and cement-treated granular material, manufactured from biomass bottom ash. The previous studies demonstrate the feasibility of substituting natural materials for biomass bottom ash in cement-based materials, presenting adequate mechanical behavior and durability properties to comply with the required technical specifications in different building materials

Cotton fertilization with compost of (sugarbeet) vinasse and agricultural residues

A concentrated depotassified beet vinasse was mixed with each of ten solid agricultural residues. The ten mixtures were composted for 7 months. The composts obtained after this period were used to fertilize a cotton crop. A mineral treatment was used for comparison and a treatment without fertilization was used as control. The nitrate content of petiole determined before the first top dressing revealed significant differences between treatments. All treatments produced higher yields than the control. Analysis of fibre quality did not show significant differences between treatments

Morphometric analysis of the submarine landslides in the central Great Barrier Reef margin, north-eastern Australia

The morphometric characterization of the submarine landslides on a mixed siliciclastic-carbonate margin, the Great Barrier Reef (NE Australia), is presented in this study. The landslides cover about the 27% of the slope in the study region, removing in some examples up to 33 km 3 of sediment. Spearman rank correlation coefficients show meaningful correlations among landslide size parameters. However, there is no relationship between the unfailed slope in the source area and the size of the landslide. The mobility of the landslides is within the normal range observed in other submarine landslides worldwide. The results of this study represent a preliminary step to understand the sedimentary processes, preconditioning factors and triggering mechanisms for submarine landslide generation in mixed marginse presentan los resultados de la caracterización morfométrica de los deslizamientos submarinos en un margen continental mixto siliciclástico-carbonatado, el margen de la Gran Barrera de Arrecifes (NE Australia). Los deslizamientos abarcan aproximadamente el 27% de la superficie del talud en la zona de estudio, removilizando en algunos casos volúmenes de sedimento de hasta 33 km3. El análisis de correlación de Spearman indica que existe buena correlación entre los parámetros relacionados con las dimensiones del deslizamiento. Sin embargo, no se observa relación directa entre la pendiente del talud y las dimensiones de los deslizamientos. La movilidad de los deslizamientos se encuentra dentro del rango observado en otros deslizamientos submarinos. Los resultados de este trabajo constituyen un primer paso para entender los procesos sedimentarios y mecanismos de generación de deslizamientos en los márgenes de tipo mixt

Effect of Processed Volcanic Ash as Active Mineral Addition for Cement Manufacture

In the last quarter of 2021, there was a very significant eruption of the Cumbre Vieja volcano on the island of La Palma, belonging to the Canary Islands, Spain. It generated a large amount of pyroclastic volcanic materials, which must be studied for their possible applicability. This work studies the properties and applicability of the lava and volcanic ash generated in this process. The need for reconstruction of the areas of the island that suffered from this environmental catastrophe is considered in this study from the point of view of the valuation of the waste generated. For this purpose, the possibility of using the fine fraction of ashes and lava as a supplementary cement material (SCM) in the manufacture of cement is investigated. The volcanic material showed a chemical composition and atomic structure suitable for replacing clinker in the manufacture of Portland cement. In this study, the cementing and pozzolanic reaction characteristics of unprocessed volcanic materials and those processed by crushing procedures are analysed. To evaluate the cementitious potential by analysing the mechanical behaviour, a comparison with other types of mineral additions (fly ash, silica fume, and limestone filler) commonly used in cement manufacture or previously studied was carried out. The results of this study show that volcanic materials are feasible to be used in the manufacture of cement, with up to a 22% increase in pozzolanicity from 28 to 90 days, showing the high potential as a long-term supplementary cementitious material in cement manufacturing, though it is necessary to carry out crushing processes that improve their pozzolanic behaviour