Towards closure between measured and modelled UV under clear skies at four diverse sites

The purpose of this work is determine the extent of closure between measurements and models of UV irradiances at diverse sites using state of the art instruments, models, and the best available data as inputs to the models. These include information about aerosol optical depth (unfortunately not extending down as far into the UVB region as desirable because such information is not generally available), ozone column amounts, as well as vertical profiles of temperature. We concentrate on clear-sky irradiances, and report the results in terms of UV Index (UVI)

La necesidad de implementar principios de protección al consumidor en la Comunidad Andina

El presente trabajo, presenta un análisis que determina cual el medio para la iniciación de un proceso de armonización de normas especiales referentes a la protección de los derechos de los consumidores y usuarios en los Países miembros de la Comunidad Andina y tiene como fin último convertirse en una guía para la elaboración de una norma comunitaria de protección de los derechos de los consumidores y usuarios del acuerdo sub-regional andino. Es conforme dichos objetivos que el presente trabajo se inicia con un estudio de los principios de la doctrina respecto a los derechos de los consumidores y usuarios; y cuales derechos fundamentales se encuentran consagrados actualmente frente al desarrollo científico, tecnológico y sus efectos en los consumidores y usuarios. Posteriormente se elabora un estudio de las normas vigentes de los Países miembros de la Comunidad Andina, estudio del que derivan las relativas diferencias respecto a la normativa vigente en los países miembros del acuerdo, el mismo que llevó a estudiar normas genéricas como las elaboradas por Consumers International y Naciones Unidas. Asimismo se revisaron los procesos de implementación de normas comunes respecto a los derechos de los consumidores y usuarios en la Unión Europea y el Mercado Común del Sur, haciendo evidente la necesidad de iniciar el proceso de armonización de la normativa referente a la protección de los derechos de los consumidores y usuarios en la Comunidad Andina. Estableciéndose, las conclusiones del trabajo y determinándose la necesidad de establecer un proceso de armonización normativa entre los países miembros del acuerdo, proceso que frente a la experiencia de otros acuerdos de integración debe ser llevado a cabo por etapas, a través de la implementación de los derechos fundamentales de los consumidores dentro del marco normativo del acuerdo regional andino.

Formular e implementar una estrategia de desarrollo basado en un CRM para una MIPYMES comercializadora de productos de consumo masivo ubicado en el sector de la Floresta en Quito

La presente tesis se centra en diseñar, definir e implementar una estrategia de marketing basada en un software de CRM (Customer Relationship Manager), para un micromercado comercializador de productos de consumo masivo ubicado en el sector de la Floresta en Quito. En el capítulo I, se describe la importancia de la formulación de la estrategia corporativa y de marketing, en base a una adecuada segmentación por clúster a las bases de datos de clientes y como las mismas deben levantarse y construirse en la organización. En el capítulo II, se hace un análisis situacional del micromercado tomando en cuenta el macro ambiente, medio ambiente y micro ambiente, se realiza la definición de la estrategia de marketing del negocio, en la que se establecen los objetivos estratégicos de marketing de largo plazo 2.012 – 2.016 y los objetivos tácticos de marketing de corto plazo. En el capítulo III, se realiza una investigación de mercado con el objetivo de determina la factibilidad de implementar una estrategia de marketing basada en un software de CRM al micromercado y a las diferentes MIPYMES ubicadas en el sector de la Floresta. Determinada la factibilidad,en el capítulo IV,se define como se realiza dicha implementación en el micromercado, tomando como modelo los cuatro pilares básicos del CRM, a) estrategia, b) personas, c) proceso y d) tecnología. En el capítulo V, se realizan las conclusiones a la presente tesis y se sugieren las respectivas recomendaciones que se pueden seguir.

Brief and precarious lives: Infant mortality in contrasting sites from medieval and post-medieval England (AD 850-1859)

This study compares the infant mortality profiles of 128 infants from two urban and two rural cemetery sites in medieval England. The aim of this paper is to assess the impact of urbanization and industrialization in terms of endogenous or exogenous causes of death. In order to undertake this analysis, two different methods of estimating gestational age from long bone lengths were used: a traditional regression method and a Bayesian method. The regression method tended to produce more marked peaks at 38 weeks, while the Bayesian method produced a broader range of ages and were more comparable with the expected "natural" mortality profiles. At all the sites, neonatal mortality (28-40 weeks) outweighed post-neonatal mortality (41-48 weeks) with rural Raunds Furnells in Northamptonshire, showing the highest number of neonatal deaths and post-medieval Spitalfields, London, showing a greater proportion of deaths due to exogenous or environmental factors. Of the four sites under study, Wharram Percy in Yorkshire showed the most convincing "natural" infant mortality profile, suggesting the inclusion of all births (i.e., stillbirths and unbaptised infants).

The social life of ruins: sites of memory and the politics of a Zimbabwean periphery

This article explores conflicts over a series of ruins located within Zimbabwe's flagship National Park. The relics have long been regarded as sacred places by local African communities evicted from their vicinity, and have come to be seen as their ethnic heritage. Local intellectuals' promotion of this heritage was an important aspect of a defensive mobilization of cultural difference on the part of a marginalized minority group. I explore both indigenous and colonial ideas about the ruins, the different social movements with which they have been associated and the changing social life they have given the stone relics. Although African and European ideas sometimes came into violent confrontation - as in the context of colonial era evictions - there were also mutual influences in emergent ideas about tribe, heritage and history. The article engages with Pierre Nora's notion of 'sites of memory', which has usefully drawn attention to the way in which ideas of the past are rooted and reproduced in representations of particular places. But it criticizes Nora's tendency to romanticize pre-modern 'memory', suppress narrative and depoliticize traditional connections with the past. Thus, the article highlights the historicity of traditional means of relating to the past, highlighting the often bitter and divisive politics of traditional ritual, myth, kinship, descent and 'being first'. It also emphasizes the entanglement of modern and traditional ideas, inadequately captured by Nora's implied opposition between history and memory. (c) 2005 Elsevier Ltd. All rights reserved.

Effect of pH on the development of acidic sites in clayey and sandy loam Oxisol from the Cerrado Region, Brazil

Titration curves were determined for soil from horizon samples of a clayey and a sandy loam Oxisol by (a) adding NaOH to soil suspensions and (b) incubating moist soils with Ca(OH)(2). The organic fraction was primarily responsible for buffering in both soils. Humic acids were more important than fulvic acids in buffering against NaOH additions. With Ca(OH)(2), greater buffer capacities were found due to carboxyl sites, primarily on fulvic acids, becoming complexed with Ca2+ so that in the clay soil humic and fulvic acids were equally important as buffering components while fulvic acids were more important in the sandy loam soil. The buffer capacity of organic matter against Ca(OH)(2) additions was 1.1 mol(c) kg(-1) pH(-1). In the incubated soils, exchangeable cations were also determined and changes in the amounts of exchangeable and non-exchangeable Ca2+ acidity and effective cation exchange capacity were calculated. Up to half the added Ca2+ became complexed and was nonexchangeable. Aluminum complexed by organic matter appears to be an important buffering component, together with non exchangeable H+. With the increase of pH the dissociated sites from the carboxyl groups could complex Ca2+. (c) 2005 Elsevier B.V. All rights reserved.

Estimating uncertainty in terrestrial critical loads and their exceedances at four sites in the UK

Critical loads are the basis for policies controlling emissions of acidic substances in Europe and elsewhere. They are assessed by several elaborate and ingenious models, each of which requires many parameters, and have to be applied on a spatially-distributed basis. Often the values of the input parameters are poorly known, calling into question the validity of the calculated critical loads. This paper attempts to quantify the uncertainty in the critical loads due to this "parameter uncertainty", using examples from the UK. Models used for calculating critical loads for deposition of acidity and nitrogen in forest and heathland ecosystems were tested at four contrasting sites. Uncertainty was assessed by Monte Carlo methods. Each input parameter or variable was assigned a value, range and distribution in an objective a fashion as possible. Each model was run 5000 times at each site using parameters sampled from these input distributions. Output distributions of various critical load parameters were calculated. The results were surprising. Confidence limits of the calculated critical loads were typically considerably narrower than those of most of the input parameters. This may be due to a "compensation of errors" mechanism. The range of possible critical load values at a given site is however rather wide, and the tails of the distributions are typically long. The deposition reductions required for a high level of confidence that the critical load is not exceeded are thus likely to be large. The implication for pollutant regulation is that requiring a high probability of non-exceedance is likely to carry high costs. The relative contribution of the input variables to critical load uncertainty varied from site to site: any input variable could be important, and thus it was not possible to identify variables as likely targets for research into narrowing uncertainties. Sites where a number of good measurements of input parameters were available had lower uncertainties, so use of in situ measurement could be a valuable way of reducing critical load uncertainty at particularly valuable or disputed sites. From a restricted number of samples, uncertainties in heathland critical loads appear comparable to those of coniferous forest, and nutrient nitrogen critical loads to those of acidity. It was important to include correlations between input variables in the Monte Carlo analysis, but choice of statistical distribution type was of lesser importance. Overall, the analysis provided objective support for the continued use of critical loads in policy development. (c) 2007 Elsevier B.V. All rights reserved.