Mercante I.T.,National University of Cuyo |
Bovea M.D.,Jaume I University |
Ibanez-Fores V.,Jaume I University |
Arena A.P.,University of Mendoza
International Journal of Life Cycle Assessment | Year: 2012
Purpose The aim of this study is to develop and analyse a life cycle inventory of construction and demolition waste (C&DW) management systems based on primary data collected directly from Spanish enterprises involved in the life cycle of this type of waste material. Special emphasis is placed on assessing the environmental profile of inert waste sorting and treatment (IWST) facilities. Methods Taking the management of 1 t of C&DW as the functional unit, this study describes the boundaries of the C&DW management system and the scope of the research, which includes all stages from the temporary storage of waste in containers to its recovery or disposal on landfills. Primary data were collected directly from some Spanish enterprises involved in the life cycle of C&DW management: two firms that manufacture containers and bags, two companies responsible for the temporary storage of waste and transporting it, five firms devoted to sorting and treating the waste and two enterprises that operate inert landfills. Special attention was given to the IWST facilities, whose inventory data were related to four phases: pre-treatment and the primary, secondary and tertiary sectors. Finally, indicators were obtained for different impact categories. Results The environmental profiles of IWST facilities for mixed C&DW show that the greatest environmental impacts are produced in primary and tertiary sectors. From the life cycle analysis of C&DW management, it can be seen that transport, sorting and disposal make a net contribution to the environmental impact. Savings are due to the recycling of plastics, metals, aggregates and wood for all the impact assessment categories, except global warming in the case of wood and cardboard. Conclusions Impact of IWST can be reduced by selective collection at source, since it avoids the separation of light fractions at plants. Life cycle assessment of C&DW shows that transportation stage plays a decisive role and recycling is not always beneficial. © 2011 Springer-Verlag.
Mera Y Sierra R.,University of Mendoza |
Mera Y Sierra R.,National University of Cuyo |
Agramunt V.H.,University of Valencia |
Cuervo P.,University of Mendoza |
Mas-Coma S.,University of Valencia
Parasites and Vectors | Year: 2011
In Argentina, human fascioliasis has never been adequately analysed, although having a physiography, climate, animal prevalences and lymnaeids similar to those of countries where the disease is endemic such as Bolivia, Peru and Chile. We performed a literature search identifying 58 reports accounting for 619 cases, involving 13 provinces, their majority (97.7%) from high altitudes, in central mountainous areas and Andean valleys, concentrated in Cordoba (430 cases), Catamarca (73), San Luis (29) and Mendoza (28), the remaining provinces being rarely affected. This distribution does not fit that of animal fascioliasis. Certain aspects (higher prevalence in females in a local survey, although a trend non-significant throughout Argentina) but not others (patient's age 3-95 years, mean 37.1 years) resemble human endemics in Andean countries, although the lack of intensity studies and surveys in rural areas does not allow for an adequate evaluation. Human infection occurs mainly in January-April, when higher precipitation and temperatures interact with field activities during summer holidays. A second June peak may be related to Easter holidays. The main risk factor appears to be wild watercress ingestion (214) during recreational, weekend outings or holiday activities, explaining numerous family outbreaks involving 63 people and infection far away from their homes. Diagnosis mainly relied on egg finding (288), followed by serology (82), intradermal reaction (63), surgery (43), and erratic fluke observation (6). The number of fascioliasis-hydatidosis co-infected patients (14) is outstanding. Emetine appears as the drug most used (186), replaced by triclabendazole in recent years (21). Surgery reports are numerous (27.0%). A long delay in diagnosis (average almost 3.5 years) and high lithiasis proportion suggest that many patients are frequently overlooked and pose a question mark about fascioliasis detection in the country. High seroprevalences found in recent random surveys suggest human endemic situations. This analysis highlights that human fascioliasis may have been overlooked in the past and its real epidemiological situation in high risk rural, mainly altitudinal areas, may currently be underestimated. Results provide a valuable baseline on which to design appropriate multidisciplinary studies on humans, animals and lymnaeids to assess up to which level and in which areas, human fascioliasis may represent a health problem in Argentina. © 2011 Mera y Sierra et al; licensee BioMed Central Ltd.
Agosta E.,CONICET |
Canziani P.,CONICET |
Cavagnaro M.,Equipo Interdisciplinario para el Estudio de Procesos Atmosfericos en el Cambio Global |
Cavagnaro M.,University of Mendoza
Journal of Applied Meteorology and Climatology | Year: 2012
Mendoza Province is the major Argentinian vitivinicultural region, and its grape production is fundamental for the national vintage. The 1979-2009 climate-annual grape yield relationships are analyzed, and total grape yield is shown to depend significantly on regional "summer"(October-March) precipitation. Precipitation negatively affects yields through plant disease and damage/destruction by hail. At interannual scales, summer regional precipitation variability can explains 25% of the yield variance. Summer precipitation modulates yield with a 6-8-yr period: wet (dry) summers can be associated with larger (smaller) grape damage/loss probability during the summer preceding the vintage, as well as lower (higher) grape yields in the subsequent annual campaign because of bud damage. With respect tomonthlymean precipitation atMendozaObservatory, wetter Novembers/Decembers can lead to lower yields. Hail during the summer of the previous harvest and during December could lower yields.Winter, late spring, and early summer mean maximum temperatures can impact current and subsequent annual yields: warmer (colder) months are linked to enhanced (decreased) yields. These relationships can be associated with circulation and SST conditions in the equatorial and extratropical Pacific Ocean basin and southern South America: SSTs within the southeastern South Pacific are related to western equatorial Pacific SSTs and convection, which modify circulation and water vapor transport over southern South America. Statistical multilinear modeling shows that the observed relationships among yield, precipitation, and temperature can explain at least 60%of the observed interannual yield variability. It is thus possible to quantitatively estimate, some months in advance, the upcoming vintage's yield. © 2012 American Meteorological Society.
Carrara R.,CONICET |
Carrara R.,University of Mendoza |
Vazquez D.P.,CONICET |
Vazquez D.P.,University of Mendoza
Ecography | Year: 2010
Species-energy theory posits that energy availability regulates population sizes, extinction rates and ultimately species richness. This theory has focused mostly on total energy as a measure of energy availability. However, because energy variation can also influence population sizes and extinction rates, species-energy theory should arguably consider simultaneously both total energy and its variation. Using data on species richness of land birds and mammals, we compared the fit of three species-energy models including total energy, energy variation or both combined. We show that the combination of total energy and energy variation has greater predictive power than any of them considered separately. We also evaluate three crucial assumptions of this modified species-energy theory and show that they are supported by available data. These results illuminate the current debate on climate change, given that both average conditions and variability of climatic conditions are likely to change in the future. © 2010 The Authors.
Gao Y.,University of Kaiserslautern |
Ruestes C.J.,National University of Cuyo |
Tramontina D.R.,National University of Cuyo |
Tramontina D.R.,University of Mendoza |
Urbassek H.M.,University of Kaiserslautern
Journal of the Mechanics and Physics of Solids | Year: 2014
Using molecular-dynamics simulation, we study nanoindentation in fcc (Cu and Al) and bcc (Fe and Ta) metals by a spherical indenter and investigate the size of the plastic zone generated. We find that while it does not strongly depend on crystal structure, surface orientation, and indentation parameters, the extent of the plastic zone is substantially larger before the retraction of the indenter. After retraction, the results are in good agreement with available published data. Plasticity develops by the generation, propagation and reaction of dislocations; they fall into two groups, those that adhere to the indentation pit, and those that have been emitted either into the substrate interior or glide along the surface. The total length of the dislocation network generated roughly follows available geometrical estimates; results for individual surface orientations may, however, differ quite strongly. The radial distribution of the dislocations attached to the indentation pit is computed; as a rule it shows a maximum at some depth below the indentation pit. © 2014 Elsevier Ltd.
Gonzalez R.,University of Mendoza |
Giribet J.I.,University of Buenos Aires |
Patino H.D.,National University of San Juan
Mathematical and Computer Modelling of Dynamical Systems | Year: 2015
New solutions to the navigation problem related to low-cost integrated navigation systems (INS) are often published. Since these new solutions are generally compared with ad hoc mathematical models that are not fully exposed, one cannot be sure of the relative improvements. In this work, complete mathematical model for a low-cost INS is suggested to be used as a benchmarking. As far as the authors’ knowledge, a benchmarking for low-cost INS has not been previously reported. Shown INS comprises a strapdown inertial navigation system, loosely coupled to a GPS receiver. The INS mathematical model is based upon classical navigation equations and classical sensor models, both from recognized authors. The algorithm that details the INS operation is also presented. The benchmarking is provided as an open-source toolbox for MATLAB. Additionally, this work can be taken as a starting point for new practitioners in the INS field. To validate the INS mathematical model, real-world data sets from three different Micro Electro-Mechanical Systems (MEMS) inertial measurement units (IMU) and a GPS receiver are processed. It is observed that obtained RMS errors from the three INS are coherent with the quality of corresponding MEMS IMU. This confirms that the proposed benchmarking is a suitable tool to evaluate objectively new solutions to low-cost INS. © 2014, © 2014 Taylor & Francis.
Saravi F.D.,Bone Densitometry Unit |
Saravi F.D.,University of Mendoza |
Sayegh F.,University of Mendoza
Journal of Osteoporosis | Year: 2013
Weight-bearing and resistance physical activities are recommended for osteoporosis prevention, but it is unclear whether an intensity level above current recommendations has a positive effect on adult premenopausal women. Body composition and bone mineral density (BMD) by DXA were compared in three groups of women as follows: Sedentary, Maintenance exercise, and federated Sport Team (n=16 for each group). Physical activity was estimated from the International Physical Activity Questionnaire (IPAQ). The groups did not differ in age, height, weight, or body mass index. Bone mineral content and non-fat soft tissue mass were higher and fat mass was lower in the Sport Team group than in the other groups. The same was true for BMD of total skeleton, lumbar spine, femoral neck, and total hip. A test for linear trend of body composition and BMD showed significant results when including all three groups. Simple and multiple regression analyses showed significant associations between physical activity level (or alternatively, years of participation in programmed physical activity) and bone mass measures at all sites except for the middle third of radius. It is concluded that a level of physical activity higher than that usually recommended benefits bone health in adult premenopausal women. © 2013 Fernando D. Saraví and Fabiana Sayegh.
Schluter F.,University of Mendoza
Artificial Intelligence Review | Year: 2012
The problem of learning the Markov network structure from data has become increasingly important in machine learning, and in many other application fields. Markov networks are probabilistic graphical models, a widely used formalism for handling probability distributions in intelligent systems. This document focuses on a technology called independence-based learning, which allows for the learning of the independence structure of Markov networks from data in an efficient and sound manner, whenever the dataset is sufficiently large, and data is a representative sample of the target distribution. In the analysis of such technology, this work surveys the current state-of-the-art algorithms, discussing its limitations, and posing a series of open problems where future work may produce some advances in the area, in terms of quality and efficiency. © 2012 Springer Science+Business Media B.V.
Monclus M.A.,University of Mendoza |
Fornes M.W.,University of Mendoza
Molecular Reproduction and Development | Year: 2016
In many mammalian and non-mammalian species, mature sperm interact within the female reproductive tract or inside the epididymal lumen using cohesive forces. This phenomenon, known as "sperm conjugation," is sometimes confused with sperm agglutination, which is the result of the interaction of epididymal or ejaculate spermatozoa upon release into culture medium. In addition to "agglutination," the terms "association," "rouleaux," or "rosettes" are employed interchangeably to describe the conjugation phenomenon, which inevitably causes confusion due to the non-unifying nomenclature. This variety of descriptions is likely due to a poor understanding of the molecular mechanisms involved in such conspicuous cell-cell interaction as well as the different morphologies that result from such interactions among species. Here, we summarize the published data regarding mammalian sperm conjugation, considering the organisms in which sperm interaction was observed; the particular terminology employed; findings regarding the components that enable sperm to adhere; sperm behavior when deposited in the female reproductive tract; and hypotheses formulated to clarify the biological function and, when known, the mechanisms for sperm interaction. We also propose a new classification system for this phenomenon that might clearly unify the criteria used to describe this behavior. © 2016 Wiley Periodicals, Inc.
Schluter F.,University of Mendoza |
Bromberg F.,University of Mendoza |
Edera A.,University of Mendoza
Annals of Mathematics and Artificial Intelligence | Year: 2014
In this work we consider the problem of learning the structure of Markov networks from data. We present an approach for tackling this problem called IBMAP, together with an efficient instantiation of the approach: the IBMAP-HC algorithm, designed for avoiding important limitations of existing independence-based algorithms. These algorithms proceed by performing statistical independence tests on data, trusting completely the outcome of each test. In practice tests may be incorrect, resulting in potential cascading errors and the consequent reduction in the quality of the structures learned. IBMAP contemplates this uncertainty in the outcome of the tests through a probabilistic maximum-a-posteriori approach. The approach is instantiated in the IBMAP-HC algorithm, a structure selection strategy that performs a polynomial heuristic local search in the space of possible structures. We present an extensive empirical evaluation on synthetic and real data, showing that our algorithm outperforms significantly the current independence-based algorithms, in terms of data efficiency and quality of learned structures, with equivalent computational complexities. We also show the performance of IBMAP-HC in a real-world application of knowledge discovery: EDAs, which are evolutionary algorithms that use structure learning on each generation for modeling the distribution of populations. The experiments show that when IBMAP-HC is used to learn the structure, EDAs improve the convergence to the optimum. © 2014, Springer International Publishing Switzerland.