1,090 research outputs found
Evidence on perceptual nature of the number sense, on groupitizing phenomenon and on the relationship between number sense, math abilities and math anxiety
Setting time of ecological bricks with different percentage PET
Raw materials and products environment friendly has led many authors to develop the area of bio-construction, especially in civil construction, using alternative materials to obtain new achievements. PET (Polyethylene terephthalate) bottles, widely used worldwide, have made it possible to produce very ambitious technological products for their energy and economic efficiency. This study is based on the application of discarded PET bottles for application in ecological building bricks. For this, samples with different PET percent were prepared. The samples were prepared in triplicate. These samples were subjected to tests to verify the optimum setting time/PET ratio. The tests were performed according to international standards and compared to the values of conventional bricks.Keywords: Environment friendly, set-up tests, bio-construction
Fostering impact-orientated interdisciplinary collaboration between design and care
Design can be defined as a practice (leading to artefacts and services) as well as a way to research but it also can be used to describe a way to look at the world (design thinking) (Bannon and Ehn 2012; Kimbell 2011). As an approach, design has been highlighted as a way to innovate within ill-structured problems (so-called wicked problems)(Rittel and Webber 1973) such as healthcare (PatrÃcio et al. 2020). Within this, the authors position themselves on the continuum between design and dementia that began to emerge in the 1980s and aligned to the paradigm shift taking place in dementia care; from a purely biomedical model towards a psychosocial-oriented approach that included recognizing the influence of the designed environment (Zeisel et al. 2020). Parallel to care’s person-centered-care approach (Kitwood 1988), was design’s shift toward being more human-centered and inclusive (Roth 1999)​​.
There are challenges, however, when design collaborates with professional care partners. Care’s full participation is sometimes ‘hindered’ by aspects related to design (such as academic jargon, time management, etc.) (Hendriks et al. 2017). When looking to move forward, the rules of engagement for collaboration need to be defined. It must resolve these issues but also consider the means to bridge similar challenges when working with other domains such as health policy making, care economics, human resources, logistics, etc.
Based on initial research into the intersection of these different domains, this paper identifies the challenges that come with these cross-discipline, impact-orientated collaborations in terms of the expectations, methodology, processes, organisational structures, and visions of impact from non-design partners in these projects. It reflects upon the inclusion of these non-design partners in design-orientated projects and offers a series of considerations as a means to better prepare and enhance impactful collaboration within care between design and other necessary domains.publishe
Efecto de una goma de mascar conteniendo xilitol sobre los niveles salivales del Streptococcus mutans
OBJETIVO: El presente estudio tiene como objetivo comparar el efecto de una goma
de mascar con y sin xilitol sobre los niveles salivales del Streptococcus mutans.
MATERIALES Y MÉTODOS: Este ensayo doble ciego controlado, se realizó en 22
voluntarios de entre 20 a 25 años de edad, con un mÃnimo de dos caries de II grado,
ausencia de enfermedad periodontal, prótesis u ortodoncia. Ellos fueron divididos en
dos grupos iguales. Se recogieron muestras de saliva antes del consumo de las gomas
de mascar y se hizo el recuento de unidades formadoras de colonias (UFC), registrando
los datos como referencia. Posteriormente, a un grupo se le pidió masticar una goma
de mascar con 60.5% de xilitol (1 g) y al otro, una goma de mascar sin xilitol, 5
minutos, una vez al dÃa, durante 3 dÃas. Las muestras de saliva se recogieron a las 24 y
72 horas para proceder a la inoculación y recuento de las colonias.
RESULTADOS: Los resultados obtenidos no mostraron diferencia estadÃsticamente
significativa al inicio del estudio (p=0.059), pero a las 24 y 72 horas las UFC del grupo
con xilitol con respecto a las UFC del grupo control disminuyeron significativamente
(p<0.001) sobre los niveles salivales del Streptococcus mutans.
CONCLUSIÓN: La goma de mascar con xilitol presentó disminución
estadÃsticamente significativa (p<0.001) sobre los niveles salivales del Streptococcus
mutans, en comparación con la goma de mascar sin xilitol.OBJECTIVE: The present study aims to compare the effect of chewing gum without
and with xylitol on salivary levels of Streptococcus mutans.
MATERIALS AND METHODS: This double-blind, controlled study was performed
in 22 volunteers aged 20-25 years old, with at least two cavities of II degree, absence
of periodontal disease, prothesis or orthodontics. They were randomly divided into two
equal groups. Saliva samples were collected before consumption of chewing gums and
counting colony forming units (CFU) was made, recording the baseline. Subsequently,
a group was asked to chew a chewing gum with xylitol 60.5% (1 g) and the other, a
chewing gum without xylitol, 5 minutes, once daily, for 3 days. They were inoculated
and the colonies counted.
RESULTS : The results did not show statistically significant at baseline ( p = 0.059)
difference, but at 24 and 72 hours the CFU group with xylitol to the CFU in the control
group decreased significantly (p < 0.001 ) on salivary levels of Streptococcus mutans.
CONCLUSION: Chewing gum with xylitol showed statistically significant reduction
(p<0.001) on salivary levels of Streptococcus mutans compared with chewing gum
without xylitol.Tesi
Correlacion entre potenciales evocados auditivos estado estable y la audiometria tonal clasica en las frecuencias de 2000 y 2004 hz en sujetos normoyentes
51 p.En el presente estudio se comparó la AudiometrÃa Tonal Liminar (ATL) con el
Potencial Evocado Auditivo estado estable (PEAee), con la finalidad de inferir umbrales
audiométricos y determinar si es confiable mediante un análisis de correlación con la
ATL. Para la realización del estudio se evaluaron 40 oÃdos pertenecientes a 20 sujetos
de la Universidad de Talca obteniendo umbrales auditivos mediante ATL y PEAee a
multifrecuencia de forma binaural. Para efectos de esta investigación se analizaron las
frecuencias de 2000 y 4000 Hz. Los resultados obtenidos no indican correlación entre
ambos métodos diagnósticos. Además los umbrales electrofisiológicos son levemente
mayores a los umbrales conductuales. Esta diferencia de umbrales disminuye en la
frecuencia de 4000 Hz. En conclusión esta investigación no muestra evidencia
significativa que permita establecer el PEAee como la principal medida
electrofisiológica de la valoración de la audición en adultos jóvenes. Se sugieren
realizar nuevas investigaciones con una muestra superior al de este estudio
considerando el tipo de hipoacusia y el rango etáreo
The effect of the self-assessment cycle in the literal reading comprehension of a1 high school students
131 Páginas.​​El objetivo de este proyecto fue determinar el efecto del ciclo de auto-evaluación en​ la comprensión lectora literal y la lectura auto dirigida en los estudiantes de dos colegios públicos de Bogotá, Colombia. 71 estudiantes de noveno y décimo grado entre 14 y 16 años y cuyo nivel de inglés como lengua extranjera corresponde al nivel A1 según el Marco Común Europeo de Referencia para las Lenguas participaron en la investigación. Siguiendo un modelo de investigación acción participación, los investigadores llevaron a cabo diez sesiones donde se implementó el ciclo de auto-evaluación con el propósito de generar cambios en la práctica de enseñanza y aprendizaje del proceso de comprensión de lectura literal. Se recolectaron datos cuantitativos y cualitativos por medio de cuestionarios diagnósticos y finales, pruebas de comprensión de lectura literal inicial y final, diarios de estudiantes, observaciones de clase de los profesores, entrevistas de grupo focalizadas y muestras del trabajo de los estudiantes que incluÃan pruebas de lectura literal cada sesión. El análisis de los datos revelo que los estudiantes se familiarizaron con el ciclo de autoevaluación el cual promovió la lectura auto dirigida de los participantes ya que les permitió ser conscientes de sus debilidades y fortalezas, establecer su propias metas de lectura y aprender a monitorearlas en un proceso cÃclico. Este además afecto de forma moderada la comprensión de lectura literal considerando que la mayorÃa de ellos no alcanzo una mejorÃa significativa, no obstante los estudiantes mostraron progreso y reportaron haber adquirido más herramientas para enfrentarse a tareas de comprensión de lectura literal
Adaptacion de la norma internacional ISO 9001 a la version 2000 en Cartulinas CMPC S.A.
100 p.El presente estudio denominado "Adaptación de la norma internacional ISO 9001:1994 a la versión 2000 en Cartulinas CMPC S.A." constituye un trabajo que responde a las necesidades de la empresa para enfrentar las calla vez mas
exigentes condiciones del mercado nacional e internacional en cuanto a calidad. Para su implementación fue necesario realizar en primer termino un acabado estudio de su situación actual y posteriormente formular el Sistema de Gestión
de la Calidad, el cual esta constituido por un Manual de Calidad y un conjunto de procedimientos e instructivos. Entre los resultados del trabajo destacan el compromiso de la alta dirección asÃ
como de los jefes de unidades y operativos de la empresa respecto de la importancia de contar con una normativa de calidad, que asegura el mejoramiento continuo de sus procesos productivos y de la satisfacción del cliente
Parameter sensitivity of the WRF–LETKF system for assimilation of radar observations: Imperfect-model observing system simulation experiments
Specification of suitable initial conditions to accurately forecast high-impact weather events associated with intense thunderstorms still poses a significant challenge for convective-scale forecasting. Radar data assimilation has been showing encouraging results to produce an accurate estimate of the state of the atmosphere at the mesoscale, as it combines high-spatiotemporal-resolution observations with convection-permitting numerical weather prediction models. However, many open questions remain regarding the configuration of state-of-the-art data assimilation systems at the mesoscale and their potential impact upon short-range weather forecasts. In this work, several observing system simulation experiments of a mesoscale convective system were performed to assess the sensitivity of the local ensemble transform Kalman filter to both relaxation-to-prior spread (RTPS) inflation and horizontal localization of the error covariance matrix. Realistic large-scale forcing and model errors have been taken into account in the simulation of reflectivity and Doppler velocity observations. Overall, the most accurate analyses in terms of RMSE were produced with a relatively small horizontal localization cutoff radius (;3.6–7.3 km) and large RTPS inflation parameter (;0.9–0.95). Additionally, the impact of horizontal localization on short-range ensemble forecast was larger compared to inflation, almost doubling the lead times up to which the effect of using a more accurate state to initialize the forecast persisted.Fil: Maldonado, Paula Soledad. Instituto Franco-argentino sobre Estudios del Clima y sus Impactos; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Ruiz, Juan Jose. Instituto Franco-argentino sobre Estudios del Clima y sus Impactos; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Centro de Investigaciones del Mar y la Atmósfera. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Centro de Investigaciones del Mar y la Atmósfera; ArgentinaFil: Saulo, Andrea Celeste. Ministerio de Defensa. Secretaria de Planeamiento. Servicio Meteorológico Nacional; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas; Argentin
Molecular features similarities between SARS-CoV-2, SARS, MERS and key human genes could favour the viral infections and trigger collateral effects
In December 2019, rising pneumonia cases caused by a novel β-coronavirus (SARS-CoV-2) occurred in Wuhan, China, which has rapidly spread worldwide, causing thousands of deaths. The WHO declared the SARS-CoV-2 outbreak as a public health emergency of international concern, since then several scientists are dedicated to its study. It has been observed that many human viruses have codon usage biases that match highly expressed proteins in the tissues they infect and depend on the host cell machinery for the replication and co-evolution. In this work, we analysed 91 molecular features and codon usage patterns for 339 viral genes and 463 human genes that consisted of 677,873 codon positions. Hereby, we selected the highly expressed genes from human lung tissue to perform computational studies that permit to compare their molecular features with those of SARS, SARS-CoV-2 and MERS genes. The integrated analysis of all the features revealed that certain viral genes and overexpressed human genes have similar codon usage patterns. The main pattern was the A/T bias that together with other features could propitiate the viral infection, enhanced by a host dependant specialization of the translation machinery of only some of the overexpressed genes. The envelope protein E, the membrane glycoprotein M and ORF7 could be further benefited. This could be the key for a facilitated translation and viral replication conducting to different comorbidities depending on the genetic variability of population due to the host translation machinery. This is the first codon usage approach that reveals which human genes could be potentially deregulated due to the codon usage similarities between the host and the viral genes when the virus is already inside the human cells of the lung tissues. Our work leaded to the identification of additional highly expressed human genes which are not the usual suspects but might play a role in the viral infection and settle the basis for further research in the field of human genetics associated with new viral infections. To identify the genes that could be deregulated under a viral infection is important to predict the collateral effects and determine which individuals would be more susceptible based on their genetic features and comorbidities associated.Fil: Maldonado, Lucas Luciano. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en MicrobiologÃa y ParasitologÃa Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologÃa y ParasitologÃa Médica; ArgentinaFil: Mendoza Bertelli, Andrea Cristina. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en MicrobiologÃa y ParasitologÃa Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologÃa y ParasitologÃa Médica; ArgentinaFil: Kamenetzky, Laura. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Investigaciones en MicrobiologÃa y ParasitologÃa Médica. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Investigaciones en MicrobiologÃa y ParasitologÃa Médica; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biociencias, BiotecnologÃa y BiologÃa Traslacional; Argentin
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