Elaboración de instrumentos para determinar alturas

Este taller consiste en la elaboración de diferentes actividades que pueden ser desarrolladas en el aula, con el fin de determinar la altura de objetos, infraestructuras urbanas o árboles, utilizando materiales de fácil acceso para su elaboración, o bien, involucrando algunos elementos tecnológicos para agilizar el cálculo de datos. En el proceso de implementación, se pondrán en práctica conceptos de geometría y trigonometría, enfatizando en el aprendizaje cooperativo, dándole un papel de participación a cada integrante del grupo (líder, medidor, expositor, secretario) durante la actividad, procurando que realicen en conjunto los cálculos matemáticos, para así promover discusión y determinación de logros

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

La gestión estratégica: de la incertidumbre a la previsión organizada y pertinente (Revisión)

The current article represents a conceptual revision about satrategic management and planning rol in the educational institutions, by using the perspective of some authors who have contributed to the topic, and considering it from a general way to fanally aim it in the educational field and especially, those activities of management that involve schools at any lvel of curriculum execution. Finally, it arrives to some conclusions about the imortance of strategic planning as a phase of strategic management inorder to optimize their good performance and continuous improvement.El presente artículo constituye una revisión conceptual en torno a la gestión estratégica y la planeación en las instituciones educativas, haciendo uso de la posición de diferentes autores que han contribuido con el tema, partiendo desde el tema a nivel general para finalmente centrarlo en el campo de la educación y en particular de las actividades de gestión queconciernen a las instituciones educativas en cualquier nivel de concreción del currículo. Finalmente, se llega a algunas conclusiones sobre la importancia de la planificación estratégica como fase de la gestión estratégica en procura de optimizar su buen andar y fortalecer su mejoramiento continuo

Actitud del docente de educación secundaria hacia la historia de las matemáticas: validación de un instrumento de recolección de información

Esta ponencia corresponde a un avance de investigación, se presentan los resultados de un estudio piloto que tiene como fin determinar la confiabilidad y validación de un cuestionario construido para describir la actitud, la formación y el uso de la historia de las matemáticas manifestadas por los docentes de educación secundaria, en Costa Rica. Los componentes cognitivo, afectivo y comportamental que conforman una actitud, permitirán establecer la actitud del docente hacia la historia de las matemáticas, que será clasificada en positiva o negativa. En este avance se describe la experiencia de los investigadores en el proceso de validación del instrumento y como resultados principales de la prueba piloto se destacan un Alfa de Cronbach de 0,931 y una actitud positiva hacia la historia de las matemáticas por parte del profesorado

Análisis económico del uso de clorhidrato de zilpaterol en la alimentación de corderas

Con el objetivo de realizar un análisis económico sobre el uso de clorhidrato de zilpaterol en ovinos se realizó una investigación con datos provenientes de la engorda de 24 corderas Dorper - Pelibuey en finalización mediante la técnica de costos, ingresos y rentabilidad. Los animales se dividieron en dos grupos de 12 corderas cada uno: Testigo (T1), alimentados con una dieta basal + 100 g de trigo molido, y (T2), que recibieron la dieta basal + 100 g de trigo molido con 10 mg de clorhidrato de zilpaterol (CZ) cada animal durante 24 horas, por 34 días. El contenido de la dieta tuvo 15.8% de proteína cruda (PC) y 2.8 Mcal/kg de energía metabolizable (EM), con un costo de producción de $3.96 por kg. Las variables de interés fueron peso inicial, peso final, ganancia de peso, conversión alimenticia y peso en canal. Para T1 el costo de producción, ingreso y ganancia/animal, por venta en canal, fueron de$823.1, $918.4 y$95.3, mientras que para T2 fueron de $863.8,$1,111.0 y $247.1, respectivamente. Asimismo,la relación beneficio-costo (RB/C) en canal para T1 fue de 1.11 y para T2 de 1.29. Se concluye que la rentabilidad fue mayor en animales suplementados en la dieta con clorhidrato de zilpaterol en relación con los animales testigo

Validation of models with constant bias: an applied approach

Objective. This paper presents extensions to the statistical validation method based on the procedure of Freese when a model shows constant bias (CB) in its predictions and illustrate the method with data from a new mechanistic model that predict weight gain in cattle. Materials and methods. The extensions were the hypothesis tests and maximum anticipated error for the alternative approach, and the confidence interval for a quantile of the distribution of errors. Results. The model evaluated showed CB, once the CB is removed and with a confidence level of 95%, the magnitude of the error does not exceed 0.575 kg. Therefore, the validated model can be used to predict the daily weight gain of cattle, although it will require an adjustment in its structure based on the presence of CB to increase the accuracy of its forecasts. Conclusions. The confidence interval for the 1-α quantile of the distribution of errors after correcting the constant bias, allows determining the top limit for the magnitude of the error of prediction and use it to evaluate the evolution of the model in the forecasting of the system. The confidence interval approach to validate a model is more informative than the hypothesis tests for the same purpose

Zilpaterol hydrochloride improves growth performance and carcass traits without affecting wholesale cut yields of hair sheep finished in feedlot

Growth of the sheep meat industry throughout the world has been slow compared with meat industries of other domestic animals. Therefore, increasing productivity and efficiency of sheep meat production are key factors to enhance the competi- tiveness of this industry (Montossi et al. 2013). The use of β2- adrenergic agonists (β2-AA) as growth promoters has demon- strated to increase sheep meat production by improving protein deposition in muscle (Domínguez-Vara et al. 2013). The use of such technology in the lamb fattening systems could be a nutritional strategy to improve their competitiveness.Fourteen Dorper × Pelibuey ram lambs (initial body weight [BW] = 37.4 ± 1.0 kg and age = 4.5 mo) were housed in individual pens during a 30-d feeding period, and then slaughtered to determine the effects of zilpaterol hydrochloride (ZH) supplementation on productive performance, carcass characteristics and wholesale cut yields. Lambs were assigned under a randomized complete block design (initial BW as blocking factor) to one of two dietary treatments: basal diet without (control) or with 10 mg daily of ZH/lamb. Lambs fed ZH had greater (P ≤ .04) final BW, average daily gain and dry matter intake, but similar (P = .24) feed efficiency compared with control lambs. Hot and cold carcass weight, dressing percentage, longissimus muscle area and leg perimeter were greater (P ≤ .05) for ZH-fed lambs than for control lambs. With exception of blood percentage which decreased (P < .01) with ZH, wholesale cut yields and non-carcass components were unaffected (P ≥ .12) by ZH supplementation. In conclusion, ZH can be used to improve growth rate and dressing percentage, but not to increase wholesale cut yields in feedlot finishing ram lambs.This study was supported by PROMEP-SEP under the thematic network ‘Uso de Promotores de Crecimiento en Ovinos de Pelo (2014–2017

Factores que determinan la adopci?n de la facturaci?n electr?nica v?a SMS por las MYPES de Lima

La Superintendencia Nacional de Administraci?n Tributaria (SUNAT), es la encargada, entre otras funciones, de recaudar impuestos de diferente origen en nuestro pa?s. En la actualidad esta se puede realizar de manera f?sica y/o electr?nica; siendo esta ultima la que brinda mejores capacidades sobre todo por temas de automatizaci?n; cre?ndose un ecosistema, en el que empresas como proveedores de servicios electr?nicos (PSE) brindan servicios de emisi?n electr?nica. La SUNAT prev? a largo plazo que la facturaci?n electr?nica reemplace a la facturaci?n f?sica el 100% de los casos; sin embargo, la realidad de nuestro pa?s hace notoria diversas dificultades para este cometido, principalmente por la conectividad a internet. Ante ello se plantea una soluci?n que no requiera conexi?n a internet, simplemente red telef?nica, como es una arquitectura basada en emisi?n por SMS, cubri?ndose as? un mayor territorio. Creemos que las empresas m?s grandes tendr?an alguna dificultad para usar este sistema ya que emiten muchas facturas en periodos cortos y una soluci?n de SMS al menos en una soluci?n b?sica ser?a poco usable. Adem?s de ello, estas tienen la capacidad de obtener servicios de una PSE por su fuerte financiero

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.Centro de Investigaciones del Medioambient

Efeito relativo da idade em crianças e jovens participantes de jogos estudantis

O Efeito Relativo da Idade (ERI) tem sido observado em diversos escalões etários e modalidades esportivas. Neste trabalho averiguou-se a incidência e a extensão do ERI nas equipes campeãs e finalistas dos Jogos Estudantis de Castro – PR (JECA). Para isto, foram levantas as datas de nascimento de 358 atletas de ambos os sexos e praticantes das modalidades: basquetebol, futsal e voleibol. Através do software SPSS 20.0 foram produzidas estatísticas descritivas de tendência central, frequências, percentagens e o teste Qui-quadrado com nível de significância pré-estabelecido em p≤0,05. Apesar do baixo nível de competitividade verificou-se uma frequência significativamente superior de participantes nascidos no primeiro semestre do ano vigente para competição quando se observou: a amostra total, amostra masculina, para o agrupamento G2 (12,2±0,5 anos de idade), para a amostra feminina do agrupamento G2, para os praticantes de basquetebol e para os basquetebolistas do gênero masculino. Estes resultados alertam para a necessidade de se rever os modelos de seleção esportiva e de divisão dos escalonamentos etários para que todas as crianças e jovens tenham as mesmas condições de participar e de se desenvolverem dentro do esporte