A5111527382- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Photorefractive and Nonlinear Optics
- Advanced Optical Imaging Technologies
- Particle accelerators and beam dynamics
- Metal and Thin Film Mechanics
- Heavy Metals in Plants
- Archaeology and ancient environmental studies
- Air Quality Monitoring and Forecasting
- Economic and Social Development
- Photonic and Optical Devices
- Heavy metals in environment
- Semiconductor Lasers and Optical Devices
- Cocoa and Sweet Potato Agronomy
- Environmental and Ecological Studies
- Public Policy and Governance
- Environmental and Cultural Studies in Latin America and Beyond
- Sensory Analysis and Statistical Methods
- Semiconductor materials and devices
- Ion Channels and Receptors
- Cultural Heritage Materials Analysis
- Stress and Burnout Research
- Mobile Learning in Education
Tecnológico de Monterrey
2024
Universidad Nacional de Colombia
2024
Universidad Nacional Autónoma de México
2008-2021
Autonomous University of Tlaxcala
2020
Universidad Técnica del Norte
2017
Pontificia Universidad Católica del Ecuador
2015
Central Bank of Venezuela
2003
Instituto Politécnico Nacional
1998
Instituto de Ciencia y Tecnología de Polímeros
1994
Consejo Superior de Investigaciones Científicas
1993
Urban gardening has been used as a practical theme for science education. However, limited research exists on the use of this remote delivery laboratory education during COVID-19 pandemic. Thus, study investigated effects introducing agriCHEMture—a home-based, urban gardening-themed e-learning material—on students' General Chemistry achievement within learning environment. A quasi-experimental one-group pre-test and post-test design was utilised. Fifty-one senior high school students...
Abstract One of the problems involved in increasing photopolymer sensitivity, is oxygen inhibition. In this paper we present a photochemical process which two dye-sensitizer photoinitiator system leads to suppression inhibiting effect oxygen. Additionally, presents possibility panchromatic with light sensitivity green and red lines. Diffraction efficiencies 40% 514 633 nm lines are obtained less than 10 mJ cm−2.
The composition and the holographic behavior of a new photopolymer with high diffraction efficiencies (30% at 514 60% 633 nm) are described.
Due to the demands of better (accurate and precise) analytical results using X-ray Fluorescence (XRF) at Aerosol Laboratory, Instituto de Física, UNAM, it was necessary carry out improvements in instrumentation procedures x-ray spectrometer located this facility. A new turbomolecular vacuum system installed, which allows reaching working pressure a shorter time. Characteristic x-rays are registered with Silicon Drift Detector, or SDD, (8 mm thick Be window, 140 eV 5.9 keV resolution),...
Elemental analyses of samples Mexican varieties dried chili peppers were carried out using X-ray Fluorescence (XRF). Several specimens Capsicum annuum L., chinense, and pubescens analyzed the results compared to previous studies elemental contents in other (ancho, morita, chilpotle, guajillo, pasilla, árbol). The first set was bought packaged markets. In present work, study focuses on home-grown árbol chilpotle varieties, commercial habanero (Capsicum chinense), as well manzano pubescencs)....
Abstract Fractal development during polymerization of a dimethacrylate system (Bis‐GMA/TEGDMA) has been studied through the analysis time series obtained sequentially by pulsed photoacoustics. The photoacoustic signals as in situ photopolymerization Bis‐GMA/TEDGMA were analyzed rescaled range analysis, dispersion and detrended fluctuation methods. reveals presence more than one scaling parameter and, therefore, belongs to complex process known multifractal. evolution fractality was compared...
A study was performed in the Winter of year 2015 a Southwestern site MAMC (Ciudad Universitaria), collecting PM2.5 samples with Mini Vol. As part wider focused to fully characterize aerosols at this site, an X-ray Fluorescence (XRF) spectrometer (based on Rh tube) built analyze environmental samples, used sample set. total 16 elements (Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, and Pb) were detected most mean concentrations calculated. Cluster analysis also applied elemental...
In this paper we present the experimental results obtained for optimization of an acrylamide photopolymer use in real time holography. The optimum energetic sensitivity is by decreasing inhibition time, which achieved including a second sensitizing system, and carrying out pre-exposure. way it possible to eliminate all oxygen sample fundamental cause process. We have 3 mJ/cm<SUP>2</SUP> at 633 nm.
En el ámbito deportivo, la mejora de los reflejos se considera un componente crucial durante entrenamiento. Para ello, utilizan diversas herramientas tecnológicas para entrenar capacidad reacción ojo-mano, una comúnmente asociada a atleta. Los dispositivos utilizados estas tareas basan principalmente en sistemas iluminación controlados manera remota, combinados con sensores táctiles electrónicos. Sin embargo, algunos estos presentan limitaciones físicas términos estimación del tiempo Por lo...