Listar por título
Mostrando publicaciones 3465-3484 de 5127
-
Obstáculos y errores conceptuales detectados en el proceso de aprendizaje de los números enteros y su operatoria, por parte de los estudiantes que terminan la enseñanza básica
(Universidad Católica del Maule, Facultad de Ciencias Básicas, 2014) -
Obtención y caracterización de carbones activados preparados a partir de cenizas volantes de una planta de cogeneración en Constitución, Chile
; abril, diana
(2013)
El alto costo de la producción de carbones activados (CA) ha llevado a la búsqueda de nuevas materias primas de bajo costo y alta disponibilidad, en donde las cenizas volantes (CV) surgen como una alternativa a ser ...
-
Occupational exposure to pesticides and health symptoms among family farmers in Brazil
(2020)OBJECTIVE: To explore the association of occupational pesticide exposure with acute and mental health symptoms. METHODS: Cross-sectional survey carried out with 78 Brazilian family farmers, who were pesticide applicators ...
-
Occupational exposure to pesticides and symptoms of depression in agricultural workers. a systematic review.
(2023)Background The use of pesticides can result in harm to both the environment and human health. There is a growing concern in the field of occupational health about the impact on the mental health of agricultural ...
-
Ocio, placer y (auto)movilidad en la construcción simbólica de los “alrededores de Santiago"
(2016)Partiendo del entendido de que la vida urbana puede extenderse a los territorios extraurbanos antes de que estos sean construidos e incorporados a la trama, se estudiarán los paseos de ocio a las afueras de Santiago, que ...
-
OFDM tolerance to additive white Gaussian and laser phase noises in optical heterodyning systems accompanied by the feasible pilot-assisted equalization
(2020)It is well known that the performance of orthogonal frequency division multiplexing (OFDM) is limited by phase noise, which depends on the laser linewidths for coherent-detection radio over fiber (RoF) systems. In this ...
-
Off-line writer verification based on simple graphemes
; Mora, Marco; (2018)
A method to writer verification based on handwritten stroke analysis is presented. The proposed descriptors correspond to an estimation of the pressure applied when writing using the grayscale image of the stroke. These ...
-
Off-line writer verification based on small segments of handwritten text and convolutional neural networks
; Mora, Marco; ; (2022)
This paper proposes a new method for writer identification based on small fragments of handwritten text randomly obtained from a paragraph. The main contribution of this work is to show that small fragments carry enough ...
-
Off-line writer verification using segments of handwritten samples and SVM
; ; Mora, Marco (2021)
This works presents a method to verify a person identity based on off-line handwritten strokes analysis. Its main contribution is that the descriptors are obtained from the constitutive segments of each grapheme, in contrast ...
-
On a logistic regression model with random intercept: diagnostic analytics, simulation and biological application
(2020)This article proposes a methodology for diagnostics in a logistic regression with random intercept motivated by a biological study. The methodology includes local and global influence techniques allowing us to contrast the ...
-
On a partial least squares regression model for asymmetric data with a chemical application in mining
(2019)In chemometrical applications, covariates in regression models are often correlated, causing a collinearity problem that can be solved by partial least squares (PLS) regression. In addition, high dimensionality in the space ...
-
On existence of semi-wavefronts for a non-local reaction–diffusion equation with distributed delay
(2018)We study the problem of existence of semi-wavefront solutions for a non-local delayed reaction–diffusion equation with monostable nonlinearity. In difference with previous works, we consider non-local interaction which can ...
-
On pharmacological neuroenhancement as part of the new neurorights' pioneering legislation in Chile: a perspective
(2023)The so-called neurorights are emerging human rights, or rather reconfigurations of already existing human rights, seeking to address the impact of the possible misuse of neurotechnologies, which have the potential to become ...
-
On some goodness-of-fit tests and their connection to graphical methods with uncensored and censored data
(2020)In this work, we present goodness-of-fit tests related to the Kolmogorov-Smirnov and Michael statistics and connect them to graphical methods with uncensored and censored data. The Anderson-Darling test is often empirically ...
-
On the nature of the enzyme–substrate complex and the reaction mechanism in human Arginase I. A combined molecular dynamics and QM/MM study
(2020)We present here a complete detailed theoretical analysis of l-arginine hydrolysis catalyzed by human arginase I (HARGI). Our study combines classical molecular dynamics (MD) simulations of different models for the ...
-
On the performance of angular diversity receivers in underground mining VLC systems
(2022)Visible Light Communications (VLC) have generated great interest in the scientific community in the last five years due to their great adaptation to harsh environments. Among the scenarios that can benefit from the advantages ...
-
On the performance of MIMO-VLC techniques in underground mining environments
(2023)Underground mining visible light communication (UM-VLC) is a promising solution to ensure the well-being of workers and facilitate their work. However, underground conditions present a significant divergence from widely ...
-
On the positive side of work-family interaction: development and validation of the Short Work-Family Enrichment Scale (SP-WFES-6) in Argentina
(2024)The purpose of this study was to develop and to, subsequently, validate a Spanish version of the Short Work-Family Enrichment Scale (sp-wfes-6). Using cross-sectional (n = 438) and multi-wave (n = 103) data from a sample ...
-
On the relationship between language learning strategies and language proficiency in indian universities
(2021)Language learning strategies (LLS) research began in the mid-1970s with the main idea of individual differences in learning a foreign language focusing primarily on the characteristics of a good language learner. In the ...
-
On the role of social media in spanish language learning in indian context
(2022)Research on social media in the foreign language classroom has grown significantly in the last decade. The usage of social media has increased many times during the pandemic due to known reasons. The aim of the present ...