Search results for "Micro"
showing 10 items of 23412 documents
Programación de microrrobots por bloques
2016
Material docente perteneciente a los cursos y talleres de difusión llevados a cabo en la ETSE-UV dentro de los programas del Servei d'Informació i Dinamització (SeDi) de la Universitat de València (Aprén Emprén, Ciència ARA, Talleres de Secundaria, Conèixer y NauJove). En los entornos tecnológicos educativos, se viene adoptando la práctica del uso de robots como incentivo a la programación y diseño de sistemas/automatismos. Debido al atractivo que éstos suscitan en los estudiantes, se genera un clima propicio para el aprendizaje. La programación y el montaje de robots no sólo tienen su aplicación en sí mismos, sino que permiten dar una idea global del funcionamiento de sistemas que se desar…
Recent progress in metal-organic frameworks (MOFs) for CO2 capture at different pressures
2022
Global climate change ensued by the rise in atmospheric CO2 levels is one of the greatest challenges our planet is facing today. This worldwide distress demands technologies that can contribute to our society toward “negative carbon emissions”. Carbon capture and storage (CCS) technologies are in in important role for capturing CO2 from existing emission sources, such as industrial and energy production point sources, before new more prominent modifications to the energy infrastructure can be implemented. Recently, alongside point source capture, direct air capture (DAC) processes have emerged as highly sought-after technologies that are able to capture CO2 from the ambient air. Alongside t…
Hypervisor-Based White Listing of Executables
2019
We describe an efficient system for ensuring code integrity of an operating system (OS), both its own code and application code. The proposed system can protect from an attacker who has full control over the OS kernel. An evaluation of the system's performance suggests the induced overhead is negligible. peerReviewed
Reframing Teacher Education: Towards the Integration of Phenomenon-Based Curriculum Reform and Organizational Culture
2021
In this article, we report a case study of our experiences of a curriculum reform process based on the principles of phenomenon-based learning in higher education in the context of Finnish teacher education. We explore how democracy and participation were present in the decision making process, highlighting the challenges of promoting the phenomenon-based approach and collaboration. First, we describe the reform’s rationale, then the theoretical framework, methodology and the reform process. Next, we reflect on our experiences through documen tary and interview data. The change process included representative and participative democ racy approaches as well as an aristocratic approach. An in…
Conic optical fiber probe for generation and characterization of microbubbles in liquids
2021
A novel optical fiber probe has been developed to provide mechanical stability to microbubbles generated in fluids, the tip of the fiber is etched with hydrofluoric acid to pierce a truncated horn that fastens the microbubbles to the fiber tip and prevents misalignment or detachment caused by convection currents, vibrations or shocks in the liquid. Microbubbles are photo-thermally generated on the etched fiber and used as Fabry-Perot cavity sensor. Two methods were used to interrogate the probe: the first one, in the wavelength domain, is suitable for calibration in static or quasi static situations; the second one, in the time domain, can be used in dynamic environments. Experimental resul…
The relevance of point defects in studying silica-based materials from bulk to nanosystems
2019
The macroscopic properties of silica can be modified by the presence of local microscopic modifications at the scale of the basic molecular units (point defects). Such defects can be generated during the production of glass, devices, or by the environments where the latter have to operate, impacting on the devices’ performance. For these reasons, the identification of defects, their generation processes, and the knowledge of their electrical and optical features are relevant for microelectronics and optoelectronics. The aim of this manuscript is to report some examples of how defects can be generated, how they can impact device performance, and how a defect species or a physical phenomenon …
New advances in high-resolution optical microscopy
2015
La microscopio ía tiene como nalidad observar muestras que no pueden distinguirse a simple vista por el ojo humano dado que el tamaño de ellas es menor que su l mite de resoluci on. Un microscopio produce una imagen ampliada de la muestra a analizar. Debido a que la microscopía es un instrumento b asico para la ciencia de la vida y de los materiales, en esta Tesis se desarrolla un estudio exhaustivo de la microscopía óptica. Los microscopios opticos se pueden con gurar de diferentes formas para producir im agenes con diferentes caracter sticas. El microscopio de campo amplio, el m as simple de todos, presenta algunas limitaciones que debe ser superadas para obtener im agenes de mayor calida…
Structural and optical characterization of ZnS ultrathin films prepared by low-temperature ALD from diethylzinc and 1.5-pentanedithiol after various …
2019
The structural and optical evolution of the ZnS thin films prepared by atomic layer deposition (ALD) from the diethylzinc (DEZ) and 1,5-pentanedithiol (PDT) as zinc and sulfur precursors was studied. A deposited ZnS layer (of about 60 nm) is amorphous, with a significant S excess. After annealing, the stoichiometry improved for annealing temperatures &ge
Synthesis, Optical, and Morphological Studies of ZnO Powders and Thin Films Fabricated by Wet Chemical Methods
2020
Zinc oxide nanoparticles were prepared from Zn5(CO3)2(OH)6 precursor, capped with poly(vinylpyrrolidone) (PVP), and annealed at 600 °
Evolution of microstructure and related optical properties of ZnO grown by atomic layer deposition.
2013
A study of transmittance and photoluminescence spectra on the growth of oxygen-rich ultra-thin ZnO films prepared by atomic layer deposition is reported. The structural transition from an amorphous to a polycrystalline state is observed upon increasing the thickness. The unusual behavior of the energy gap with thickness reflected by optical properties is attributed to the improvement of the crystalline structure resulting from a decreasing concentration of point defects at the growth of grains. The spectra of UV and visible photoluminescence emissions correspond to transitions near the band-edge and defect-related transitions. Additional emissions were observed from band-tail states near th…