Aplicación del Sistema de Posicionamiento Global (GPS) al mapeo de barreras y barras intermareales, Rio Grande, Tierra del Fuego, Argentina

GPS mapping profiency of litoral features was analized during a planimetric survey in the Río Grande (Tierra del Fuego, Argentina) inlet. Two GPS Magellan Nav 5000 Pro were used applying differential processing. The expenence shows that: a) the method gives rapidly, and at a low cost, a litoral landforms measurement with a ( 5 m error; b) is weather independent and c) would allow for an inmediate mapping of significative morphological changes along the coast due to the occurrence of high energy waves

Elasticidad de la demanda de estacionamiento ante variaciones sistemáticas del ingreso en Montería, Colombia

This article analyzes on-street and private parking lots demand elasticityin the central business district of Monteria, Colombia, when fee andincome variations are considered.Estimated choice models were based on a stated preference survey.Elasticities were analyzed using a multinomial logit model, whichexplanatory variables were travel time, access time, fee and income.It was found that demand and income elasticities were -0,10 and -0,32for on-street and private parking lot, respectively. Those elasticitiesexperienced a 33,5 % change when users’ income variations are considered.This shows that a restrictive parking management policy wouldaffect lower income groups.El presente artículo analiza la elasticidad de la demanda de estacionamientosobre la vía pública y en parqueadero privado en la zona céntricade la ciudad de Montería, Colombia, considerando variaciones en latarifa y en el nivel de ingreso de los usuarios.Los modelos fueron estimados con base en datos de preferencias declaradas.Las elasticidades fueron analizadas con un modelo de tipo logitmultinomial, cuyas variables explicativas fueron el tiempo de viaje, eltiempo de acceso, el costo y el ingreso.Se encontró que las elasticidades entre la demanda y la tarifa fueronde -0,10 y -0,32 para parqueo sobre la vía pública y en parqueaderoprivado, respectivamente. Se evidenció además una diferencia del33,5 % en el valor de dichas elasticidades cuando son consideradasvariaciones de ingreso de los individuos. Esto muestra que una políticarestrictiva de gestión de precios de parqueo afectaría más a grupos conmenores ingresos

Diseño de pavimento flexible empleando polímeros etileno acetato de vinilo, en la avenida Jorge Bellota, sector Molina, anexo 22 Jicamarca – 2021

En el presente trabajo de investigación, titulada “Diseño de Pavimento Flexible Empleando Polímeros Etileno Acetato de Vinilo, en la Avenida Jorge Bellota, Sector Molina, Anexo 22 Jicamarca – 2021” tiene como objetivo general establecer la influencia del empleo del polímero etileno acetato de vinilo en el diseño de pavimentos en La Avenida Doctor Jorge Bellota Sector Molina, Jicamarca Anexo 22 - 2021. En este trabajo hemos utilizado una metodología que, comprendido un tipo de investigación aplicada, con un diseño no experimental de nivel descriptivo y con un enfoque cuantitativo. De la misma manera se efectuó una muestra considerando el tramo no pavimentado la avenida Doctor Jorge Bellota disponiendo como instrumentos formatos de conteo vehicular y fichas de investigación que ayudaron en el estudio de la via. Para la parte de diseño del pavimento flexible con polímeros Polímeros Etileno Acetato de Vinilo hemos utilizado los porcentajes de 15% y 20% de este aditivo teniendo como resultados que con el 20% le da mejor resistencia al pavimento

A fossil bone of a giant ground sloth from the last millennium of the pleistocene: New data from Salto department, Uruguay

During the Pleistocene-Holocene transition at ~10.0 uncalibrated, or ~11.7 calibrated kya, the Americas were undoubtedly inhabited by humans from north to south ends. The groups living in that time had cultural and adaptive differences in terms of subsistence and technological pursuits. Particularly in the southern cone of South America, archaeological remains witnessed hunter-gatherers living at ~11.0 - 10.0 uncalibrated kya. They mostly used the so-called “fishtail,” or just “Fell” points, a widespread Paleo-American marker. Despite that, they exploited different faunal species, including extant and extinct fauna. At the Salto Department in the northwestern region of Uruguay, on the Itaperibí Grande creek shore, archaeological remains of bones and stones were recovered. One of the most remarkable is a fragmented fossil femur of Lestodon armatus, a mega-mammal giant ground sloth. In its anterior face, this specimen shows diverse kinds of marks. However, no clear association among the findings was documented. Then, in order to check the possible relationship between the bone and the artifacts, the specimen was subjected to radiocarbon dating and it was analyzed in detail from a taphonomic perspective to evaluate the origin of the marks. The radiocarbon assay indicates that the specimen belongs to the last millennium of the Pleistocene. The date is relevant as it is one of the few assays obtained on a sample from that time. The taphonomic study revealed that the marks were not produced by human activity, hence, its primary relationship with the stone artifacts is uncertain. Despite that, these data make an important contribution to the knowledge about the fauna contemporaneously living with the earliest hunt er-gatherer that were foraging the regional landscape during one of the colonization events that populated the southern cone of South America.Fil: Nami, Hugo Gabriel. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Instituto de Geofísica "Daniel Valencio"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Chichkoyan, Karina Vanesa. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Lujan. Rectorado. Instituto de Investigaciones Geograficas; ArgentinaFil: Trindade, Mario. Museo de Arqueología y Ciencias Naturales; UruguayFil: Lanata, Jose Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio; Argentin

Detection of broken bars in three-phase motors by using curve fits and classification algorithms

Since they transform electrical energy into mechanical energy, three-phase induction motors are one of the main assets that companies have. Therefore, good monitoring of their conditions and diagnosing their faults is essential. In this article, we propose a curve fitting technique and classification algorithms for a current motor phase to detect broken bars inside the motor. The data set is in the IEEE database, where the data was acquired, simulating the conditions of healthy and broken bars by varying the load condition. The curve fitting technique gives me essential attributes such as the signal's amplitude, frequency, and phase shift, supported by the Fourier transform, which informs how the signal power is a function of frequency. Furthermore, we extracted attributes to train the classifiers, achieving 85% accuracy in classifying the number of broken bars within the engine. © 2022 IEEE

Nouvelle approche taphonomique sur les restes osseux du Pléistocène supérieur de la grotte de Pikimachay, bassin d’Ayacucho, Pérou: Possibles implications pour la colonisation humaine de l’ouest de l’Amérique du Sud

La grotte de Pikimachay dans le sud-est du Pérou a joué un rôle important dans les discussions concernant le premier peuplement de l’archéologie sud-américaine, et en particulier dans les Andes du Sud. Les fouilles effectuées par Richard MacNeish en 1969-1970 ont permis l’identification d’une séquence d’occupations humaines possibles et controversées du Pléistocène tardif aux temps historiques. Dans le cadre d’un programme de recherche visant à réévaluer les vestiges du Pléistocène supérieur de ce site, nous avons effectué des observations taphonomiques sur un échantillon osseux (n=40) appartenant à ses strates inférieures (couches h à k) comme suit : h (n=17), h1 (n=6), i (n=4), i1 (n=7), j (n=5) et k (n=1). Les datations au radiocarbone conventionnelles non calibrées initialement obtenues suggèrent que ces couches couvrent une période d’environ 14 à 25000 ans avant le présent (kybp). Chaque os a été minutieusement étudié pour connaître la nature de ses modifications, décrire l’état général des spécimens et les altérations, dans le but d’identifier une éventuelle intervention anthropique. À cette fin, nous avons considéré les modifications de surface enregistrant des fractures fraîches et post-dépositionnelles, différents types de marques, l’altération et la présence de taches de manganèse. Nous avons conclu que divers os (n=8) de la couche h étaient affectés par diverses modifications d’origine humaine. On peut donc supposer que ces nouvelles informations justifient l’hypothèse selon laquelle les os et les matériaux lithiques de la couche h auraient été produits au cours de l’Holocène inférieur/Pléistocène terminal entre ~≥9,0/10,0 et ~14,1, probablement à ~14,1 kybp ; un fait qui peut être considéré pour les restes de pierre des strates sous-jacentes h1 qui ont donné une date similaire. Les restes osseux des strates j à k ne présentent pas de modifications humaines. Ensuite, si la chronologie rapportée et son association avec les restes anthropiques sont vraies, Pikimachay pourrait encore être pertinent en ce qui concerne la discussion sur la question de la colonisation humaine dans l’ouest de l’Amérique du Sud à une époque acceptable pendant la période postglaciaire.The Pikimachay cave in south-eastern Peru had an important role in archaeological discussions concerning the first peopling of South America, and the Southern Andes in particular. The excavations by Richard MacNeish in 1969-1970 identified a sequence of possible but controversial Late Pleistocene human occupations up to historical times. As a part of a research programme aiming to re-assess the Late Pleistocene remains from this site, we made taphonomic observations on a sample of bones (n=40) from the lower strata (layers h to k) as follows: h (n=17), h1 (n=6), i (n=4), i1 (n=7), j (n=5), and k (n=1). The conventional uncalibrated radiocarbon dates initially obtained suggest that these layers span a period of ~14.0 to 25.0 thousand years before present (kybp). Each bone was thoroughly examined to determine the nature of modifications to them, and to describe alterations and the general condition of the specimens in order to identify possible anthropic intervention. For this purpose, we examined the surface modifications indicating fresh or post-depositional fractures, the different kinds of marks, weathering, and the presence of manganese staining. We concluded that several bones (n=8) from layer h showed various human-made modifications. We can therefore suggest that this new information justifies the assumption that the bones and lithic materials from layer h would have been produced during the Early Holocene/Late Pleistocene between ~≥9.0/10.0 and ~14.1, probably at ~14.1 kybp; an assumption that can also be considered for the stone remains from the underlying strata h1 that yielded a similar date. The bone remains from strata j to k do not show any human modifications. Furthermore, if the reported chronology and its association with the anthropic remains are true, the Pikimachay cave could still be relevant to the debate over the human colonisation of western South America that occurred within a similar timeframe during the postglacial era.Fil: Nami, Hugo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina. Universidad Nacional de Luján. Departamento de Ciencias Sociales; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; ArgentinaFil: Chichkoyan, Karina Vanesa. Universidad Nacional de Luján. Departamento de Ciencias Sociales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Chichkoyan, Karina Vanesa. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional Mayor de San Marcos; Perú. Universidad Nacional de Luján. Departamento de Ciencias Sociales; ArgentinaFil: Lanata, Jose Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio. Universidad Nacional de Río Negro. Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio; Argentin

Mobilization of ionophore antibiotics and glyphosate after a rainfall simulation on agricultural soils amended with poultry litter

Poultry litter (PL) is a majority waste of the intensive avian production, commonly used as an organic amendment in agricultural soils. We studied the input of pollutants from the PL, as inorganic P and ionophore antibiotics (IPA), and the influence on soil pollutants (GLP and AMPA) in real systems, after a rainfall simulation on an agronomic amended soil with PL at two residence times. Physicochemical parameters were altered in the runoff after the amendment. PL from commercial farms present a preliminary load of monensin and salinomycin. The mobility of IPA by surface runoff (0.8–31%) and leaching (0.4–38%) was determined, with monensin showing the maximum losses in both processes at both residence times. PL amendments act as a pollution diffuse source of IPA. Moreover, the amendment enhanced the mobility of GLP and AMPA in soils. Maximum losses of GLP in runoff increased from 0.56% to 9.84% in soil with PL treatment. The results were related to the amounts of P released in the surface runoff. Strategies for reducing the animal wastes and their antibiotic content must be investigated regarding the productive practice involving these residues, as water and soil conservation are proven to be a key asset in the sustainability and success of circular economy processes. This is the first study to demonstrate the combined release of pollutants from multiple origins, after the amendment with poultry litter on real agricultural soils.Fil: Navarro, Marcos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Centro de Investigaciones del Medio Ambiente; ArgentinaFil: Alonso, Lucas Leonel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Centro de Investigaciones del Medio Ambiente; ArgentinaFil: Capparelli, Alberto Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas; ArgentinaFil: Marino, Damian Jose Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Centro de Investigaciones del Medio Ambiente; Argentin

Behavior of ionophore antibiotics in aquatic environments in Argentina: The distribution on different scales in water courses and the role of wetlands in depuration

We studied for the first time three ionophore anticoccidial drugs: monensin (MON), lasalocid (LAS), and salinomycin (SAL) as emerging pollutants originating from animal and plant husbandry in surface waters (n = 89) in one of the most extensive hydrological basins in South América (Del Plata basin). The soluble fraction of ionophores was pretreated by solid-phase extraction and analyzed by LC-MS/MS at a limit of detection of 1.7 ng·L−1. A statistical approach noted the need to report parameters calculated by methods based on the number of observations and the censorship percentage over substitution methods for more precise estimations of environmental data with a high percentage of left-censored data. Water collectors adjacent to intensive-husbandry facilities, placed in direct runoffs from animal excreta, or in wastewater emissions contained median concentrations of MON and SAL approximately 70 times higher than those found in regional tributaries and main courses of 5 sub-basins of the pampas and mesopotamic regions, thus exhibiting a relevance to other similar agricultural pollutants widely reported as pesticides. Chemical speciation of these compounds in surface water was characterized especially for MON and SAL, where the pH and chemical oxygen demand of the natural water body was associated with the concentration of the soluble fraction. The concentrations in abundant rivers such as the Gualeguay deliver a contribution to a natural wetland such as the Paraná-River delta, which registered only one sample with a [MON] ≤ the limit of quantification. Since wetlands possess a limited removal capability, these affluent contributions recorded strongly indicate that attention must be paid to the development of guidelines involving quality criteria for assessing the impact of ionophore antibiotics on such ecosystems.Fil: Alonso, Lucas Leonel. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Centro de Investigaciones del Medio Ambiente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Demetrio, Pablo Martin. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Química. Centro de Investigaciones del Medio Ambiente; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Capparelli, Alberto Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata; ArgentinaFil: Marino, Damian Jose Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata; Argentin

Tuning the Thermal Relaxation of Transition-Metal Ferrite Nanoparticles Through Their Intrinsic Magnetocrystalline Anisotropy

Monodispersed ferrite nanoparticles of Fe3O4, MnFe2O4, and CoFe2O4 (near to 10 nm), were synthesized by organometallic synthesis, showing the same homogeneous chemical, morphological, and crystalline characteristics. The study and correlation of the thermal relaxation processes were analyzed through static and dynamic measurements. Due to the intrinsic chemical characteristics and magnetocrystalline anisotropy of the ferrite nanoparticles, the energy barrier can be tuned to a range between 1100 K EB 7300 K, showing an alternative approach for tuning the magnetic dynamic properties, in contrast to the well-known mechanism through particle-size-effects. Specific loss power efficiencies were evaluated for the three ferrite samples. Comparing the three samples at the maximum ac frequency of ¼10 kHz, MnFe2O4 exhibits the single-peak maximum of loss with the value of 273 erg/s g at T¼65 K, whereas for the CoFe2O4 , a maximum of 132 erg/s g (T¼ 217 K) was determined. A considerable drop in the efficiency was determined for the Fe 3O4 nanoparticles, with the value of 20 erg/s g at T¼ 43.5 K