Repositorio UMAYOR: Envíos recientes
Mostrando ítems 21-40 de 7213
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Occurrence, source estimation, and risk assessment of Polycyclic Aromatic Hydrocarbons in coastal seawaters from the Quintero Industrial Complex (Valparaiso, Chile)
(ELSEVIER, 2023-06-20)In the 1960s, the Quintero industrial complex was inaugurated in Chile. This began a history of dramatic anthropo-genic impacts on the Chilean coast. Among the known, we could mention high atmospheric emissions of chemicals ... -
Climate variability of the southern Amazon inferred by a multi-proxy tree-ring approach using Cedrelafissilis Vell
(ELSEVIER, 2023-02-01)The analysis of climate variability and development of reconstructions based on tree-ring records in tropical forests have been increasing in recent decades. In the Amazon region, ring width and stable isotope long-term ... -
Spin-lattice-dynamics analysis of magnetic properties of iron under compression
(NATURE PORTFOLIO, 2023-08-31)Compression of a magnetic material leads to a change in its magnetic properties. We examine this effect using spin-lattice dynamics for the special case of bcc-Fe, using both single- and poly-crystalline Fe and a bicontinuous ... -
Simulated nanoindentation into single-phase fcc FexNi1-x alloys predicts maximum hardness for equiatomic stoichiometry
(NATURE PORTFOLIO, 2023-06-16)We investigate by molecular dynamics simulation the mechanical behavior of concentrated alloys under nanoindentation for the special example of single-phase fcc FexNi1-x alloys. The indentation hardness is maximum for the ... -
Influence of mobile genetic elements and insertion sequences in long- and short-term adaptive processes of Acidithiobacillus ferrooxidans strains
(NATURE PORTFOLIO, 2023-07-05)The recent revision of the Acidithiobacillia class using genomic taxonomy methods has shown that, in addition to the existence of previously unrecognized genera and species, some species of the class harbor levels of ... -
Combined association of physical activity and sitting time with cardiometabolic risk factors in Chilean adults
(NATURE PORTFOLIO, 2023-06-07)In this study we examined the combined association of physical activity and sitting time with cardiometabolic risk factors in adults in Chile. This is a cross-sectional study based on 3201 adults aged from 18 to 98 years ... -
Imaging the subsurface architecture in porphyry copper deposits using local earthquake tomography
(NATURE PORTFOLIO, 2023-04-26)An essential part of the world's remaining mineral resources is expected to reside deep in the crust or under post-mineralization cover. For porphyry copper deposits, the world's primary source of Cu, Mo, and Re, identifying ... -
Machine learning modeling for the prediction of plastic properties in metallic glasses
(NATURE PORTFOLIO, 2023-01-07)Metallic glasses are one of the most interesting mechanical materials studied in the last years, but as amorphous solids, they differ strongly from their crystalline counterparts. This matter can be addressed with the ... -
Fast simultaneous electrochemical detection of Bisphenol-A and Bisphenol-S in urban wastewater using a graphene oxide-iron nanoparticles hybrid sensor
(PERGAMON-ELSEVIER SCIENCE LTD, 2023-11-10)In this work, a novel and sensitive electrochemical sensor was developed for the simultaneous determination of low concentration levels of Bisphenol-A (BPA) and Bisphenol-S (BPS) in a secondary effluent from a wastewater ... -
Electrochemical fabrication of nanowires poly (Indole-6-carboxylic acid) adorned with nanorod MnO2 for evaluation of its capacitive properties
(PERGAMON-ELSEVIER SCIENCE LTD, 2023-10-01)A poly(indole-6-carboxy acid) nanowire composite with & beta;-MnO2 nanorod (6-PICA|& beta;-MnO2-NRs) was prepared by an electrochemical method and hydrothermal. The incorporation of & beta;-MnO2-NRs and the formation of ... -
Pubertal development at age 14 is associated with male adolescents' combustible cigarette smoking and dual use, but not with e-cigarette use - Findings from the UK Millennium Cohort Study
(ELSEVIER IRELAND LTD, 2023-12-01)Background: Adolescent nicotine exposure via electronic cigarettes (e-cigarettes) is a global health concern. Pubertal development earlier than peers increases the risk of tobacco smoking compared to peers experiencing ... -
Does substance use disorder treatment completion reduce the risk of treatment readmission in Chile?
(ELSEVIER IRELAND LTD, 2023-07-01)Background: Recovery from substance use disorders (SUD) often entails multiple treatment episodes, which clashes with a context of a treatment system with limited resources and long waiting. Treatment retention and completion ... -
Probing radiation resistance in simulated metallic core-shell nanoparticles
(ELSEVIER, 2023-08)We present molecular dynamics (MD) simulations of radiation damage in Fe nanoparticles (NP) and bimetallic FeCu core-shell nanoparticles (CSNP). The CSNP includes a perfect body-centered cubic (bcc) Fe core coated with a ... -
Plastic behavior of a nanoporous high-entropy alloy under compression
(ELSEVIER, 2023-06-25)Nanoporous High-entropy alloys (HEA) have attracted increasing attention in recent years due to their remark-able mechanical properties and their capability as storage devices. However, chemical complexity involves ... -
Genome sequencing reveals molecular subgroups in oral epithelial dysplasia
(SOCIEDADE BRASILEIRA DE PESQUISA ODONTOLOGICA, 2023-07-16)This study aimed to analyze the molecular characteristics of oral epithelial dysplasia (OED), highlighting the pathways and variants of genes that are frequently mutated in oral squamous cell carcinoma (OSCC) and other ... -
Whole-exome sequencing of oral epithelial dysplasia samples reveals an association with new genes
(SOCIEDADE BRASILEIRA DE PESQUISA ODONTOLOGICA, 2023-03-23)The genetic basis of oral epithelial (OED) is unknown, and there is no reliable method for evaluating the risk of malignant transformation. Somatic mutations are responsible for the transformation of dysplastic mucosa to ... -
A method to deconvolve stellar profiles The non-rotating line utilizing Gaussian sum approximation
(EDP SCIENCES S A, 2023-08-04)Context. Currently, one of the standard procedures used to determine stellar and wind parameters of massive stars involves to comparing the observed spectral lines with a grid of synthetic lines. These synthetic lines are ... -
A Monte Carlo code for the collisional evolution of porous aggregates (CPA)
(EDP SCIENCES S A, 2023-03-29)Context. The collisional evolution of submillimeter-sized porous dust aggregates is important in many astrophysical fields.Aims. We have developed a Monte Carlo code to study the processes of collision between mass-asymmetric, ... -
V4142 Sgr: Double periodic variable with an accretor surrounded by the accretion disk's atmosphere
(EDP SCIENCES S A, 2023-02-10)Context. A detailed study of the close interacting binary V4142 Sgr, based on photometric and spectroscopic analyses, indicates that this system belongs to the enigmatic class of Algol-like variables exhibiting a long ... -
Implementación de una jornada virtual de telesalud y capacitación masiva para personas mayores chilenas y estudiantes de la salud: impacto en la cobertura
(SOC MEDICA SANTIAGO, 2023-02)Background: Aging increases the vulnerability to diseases and environmental changes such as the COVID-19 pandemic. Telehealth and tele-education are vital to prevent the deleterious effects of prolonged confinement, and ...