Enginyeria Electrònica i Biomèdica: Envíos recientes
Mostrando ítems 41-60 de 787
Efficient WO3 photoanodes fabricated by pulsed laser deposition for photoelectrochemical water splitting with high faradaic efficiency
In this work, we present a systematic study on the synthesis of monoclinic gamma - WO3 obtained using pulsed laser deposition (PLD). A photocurrent of 2.4 mA/cm2 (60% of the optical maximum for a 2.7 eV gap material) was ...
UV‐selective optically transparent Zn(O,S)‐based solar cells
This work reports experimental evidence of a photovoltaic effect in transparent UV‐selective Zn(O,S)‐based heterojunctions. Zn(O,S) has a strong interest for the development of UV‐selective solar cells with high transparency ...
Efficient tunable laser operation of Tm:KGd(WO4)2 in the continuous-wave regime at room temperature
Tm:KGd(WO/sub 4/)/sub 2/ is studied as a three-level laser on the /sup 3/F/sub 4/ /spl rarr/ /sup 3/H/sub 6/ transition and a tunable source in the 2-/spl mu/m spectral range, operating at room temperature. An overall ...
Engineering transport in manganites by tuning local nonstoichiometry in grain boundaries
Interface-dominated materials such as nanocrystalline thin films have emerged as an enthralling class of materials able to engineer functional properties of transition metal oxides widely used in energy and information ...
1.48 and 1.84 µm thulium emissions in monoclinic KGd(WO4)2 single crystals
By exciting at 788 nm, we have characterized the near infrared emissions of trivalent thulium ions in monoclinic KGd(WO4)2 single crystals at 1.48 and 1.84 mm as a function of dopant concentration from 0.1% to 10% and ...
Catheter tip distensibility substantially influences the aspiration force of thrombectomy devices
Background A direct aspiration first pass thrombectomy (ADAPT) is a fast-growing technique for which a broad catalog of catheters that provide a wide range of aspiration forces can be used. We aimed to characterize different ...
Synthesis of ZnO nanowires and impacts of their orientation and defects on gas sensing properties
ZnO nanowires (NWs) oriented in three different directions were synthesized via the vapor-liquid-solid technique over c-, r- and a-plane sapphire substrates. Gas sensing properties of these samples against reducing and ...
Analysis of S-rich CuIn(S,Se)2 layers for photovoltaic applications: Influence of the sulfurization temperature on the crystalline properties of electrodeposited and sulfurized CuInSe2 precursors
This paper reports the microstructural analysis of S-rich CuIn(S,Se)2 layers produced by electrodeposition of CuInSe2 precursors and annealing under sulfurizing conditions as a function of the temperature of sulfurization. ...
Raman scattering and photoluminescence analysis of silicon on insulator structures obtained by single and multiple oxygen implants
An analysis of silicon on insulator structures obtained by single and multiple implants by means of Raman scattering and photoluminescence spectroscopy is reported. The Raman spectra obtained with different excitation ...
PdO and PtO doped WS2 boosts NO2 gas sensing characteristics at room temperature
In this work tungsten disulphide nanostructures loaded with platinum-oxide (PtO), or palladium-oxide (PdO) were grown directly onto alumina substrates. This was achieved using a combination of aerosol-assisted chemical ...
Defect study of SnO2 nanostructures by cathodoluminescence analysis: Application to nanowires
Defects in SnO2 nanowires have been studied by cathodoluminescence, and the obtained spectra have been compared with those measured on SnO2 nanocrystals of different sizes in order to reveal information about point defects ...
Mechanical oscillations in lasing microspheres
We investigate the feasibility of activating coherent mechanical oscillations in lasing microspheres by modulating the laser emission at a mechanical eigenfrequency. To this aim, 1.5%Nd3+:Barium-Titanium-Silicate microspheres ...
Energy transfer mechanism and Auger effect in Er3+ coupled silicon nanoparticle samples
We report a spectroscopic study about the energy transfer mechanism among silicon nanoparticles (Si-np), both amorphous and crystalline, and Er ions in a silicon dioxide matrix. From infrared spectroscopic analysis, we ...
Mejora de la implicación del alumnado en “Diseño y síntesis de sistemas digitales” usando e-learning colaborativo, gamificación y aprendizaje basado en problemas
[eng] During the last 3 years, it has been observed that the students do not have a solid base to understand the concepts that are introduced in the subject. In addition, the attitude of the students, in general, is ...
Assessment of 3D Printing Technologies for Millimeter Wave Reflectors
Three different 3D printing technologies: Stereolithography (SLA), Fused Deposition Modeling (FDM) and HP Multi Jet Fusion Technology (MJF) are compared to build a parabolic reflector operating at 100 GHz. Fabrication ...
BPSK to ASK signal conversion using injection-locked oscillators-part II: experiment
This paper demonstrates the feasibility of a new circuit for the conversion of binary phase-shift keying signals into amplitude-shift keying signals. In its simplest form, the converter circuit is composed by a power ...
Effects of prior hydrogenation on the structure and properties of thermally nanocrystallized silicon layers
Nanocrystalline silicon layers have been obtained by thermal annealing of films sputtered in various hydrogen partial pressures. The as-deposited and crystallized films were investigated by infrared, Raman, x-ray diffraction, ...
A transfer Hamiltonian model for devices based on quantum dot arrays
We present a model of electron transport through a random distribution of interacting quantum dots embedded in a dielectric matrix to simulate realistic devices. The method underlying the model depends only on fundamental ...
Drift compensation of gas sensor array data by common principal component analysis
A new drift compensation method based on Common Principal Component Analysis (CPCA) is proposed. The drift variance in data is found as the principal components computed by CPCA. This method finds components that are common ...
Optical and microstructural properties of MgF2 UV coatings grown by ion beam sputtering process
The optical, mechanical, and microstructural properties of MgF2 single layers grown by ion beam sputtering have been investigated by spectrophotometric measurements, film stress characterization, x-ray photoelectron ...
