Enginyeria Electrònica i Biomèdica: Recent submissions
Now showing items 61-80 of 787
Colorimetric sensor for bad odor detection using automated color correction
Colorimetric sensors based on color-changing dyes offer a convenient approach for the quantitative measurement of gases. An integrated, mobile colorimetric sensor can be particularly helpful for occasional gas measurements, ...
The effect of substrate on high-temperature annealing of GaN epilayers: Si versus sapphire
We have studied the effects of rapid thermal annealing at 1300¿°C on GaN epilayers grown on AlN buffered Si(111) and on sapphire substrates. After annealing, the epilayers grown on Si display visible alterations with ...
New Approach to Designing Functional Materials for Stealth Technology: Radar Experiment with Bilayer Absorbers and Optimization of the Reflection Loss
Microwave power absorption by a two-layer system deposited on a metallic surface is studied in the experimental setup emulating the response to a radar signal. Layers containing hexaferrite and iron powder in a dried paint ...
Nitrogen incorporation effects in Fe(001) thin films
Nitrogen incorporates into Fe thin films during reactively sputtered TiN capping layer deposition. The influence that this nitrogen incorporation has both on the structure and magnetic properties is discussed for a series ...
ZnO nanorods for efficient third harmonic UV generation.
ZnO nanorods grown by both high temperature vapour phase transport and low temperature chemical bath deposition are very promising sources for UV third harmonic generation. Material grown by both methods show comparable ...
Toward RGB LEDs based on rare earth-doped ZnO
By using ZnO thin films doped with Ce, Tb or Eu, deposited via radiofrequency magnetron sputtering, we have developed monochromatic (blue, green and red, respectively) light emitting devices (LEDs). The rare earth ions ...
Effect of stress and composition on the Raman spectra of etch-stop SiGeB layers
Si1−(x+y)GexBy strained layers on Si (x≤3.4%, y≤0.4%) have been analyzed by Raman spectroscopy. Stress in the layers has not been observed to affect the Fano interaction parameters of the first‐order Si–Si Raman line. These ...
Readout schemes for low noise single-photon avalanche diodes fabricated in conventional HV-CMOS technologies
Three different pixels based on single-photon avalanche diodes for triggered applications, such as fluorescence lifetime measurements and high energy physics experiments, are presented. Each pixel consists of a 20µm x 100µm ...
Chemical source localization fusing concentration information in the presence of chemical background noise
We present the estimation of a likelihood map for the location of the source of a chemical plume dispersed under atmospheric turbulence under uniform wind conditions. The main contribution of this work is to extend previous ...
Very compact 3D-printed folded branch-line hybrid coupler based on loaded helical-microstrip transmission lines
This paper presents a 3D topology for high miniaturization of the well-known hybrid branch-line coupler at the UHF band. A preliminary work already proposed the use of helical-microstrip TLs combined with a folded structure ...
Size-dependent recombination dynamics in ZnO nanowires.
A deep understanding of the recombination dynamics of ZnO nanowires NWs is a natural step for a precise design of on-demand nanostructures based on this material system. In this work we investigate the influence of ...
Fish scale-based carbon dots with g-C3N 4 as a photo-catalyst for oxidation of herbicide 2,4-dichloro phenoxy acetic acid under visible light.
2,4-dichloro phenoxy acetic acid (2,4-D) has been employed as an herbicide to increase crop yields and ensure large-scale food production; however, it is highly toxic and persistent in the environment. This work deals with ...
Large Magnetoresistance in Fe/MgO/FeCo(001) Epitaxial Tunnel-Junctions on GaAs(001).
We present tunneling experiments on Fe~001!/MgO~20 Å!/FeCo~001! single-crystal epitaxial junctions of high quality grown by sputtering and laser ablation. Tunnel magnetoresistance measurements give 60% at 30 K, to be ...
Portable flow multiplexing device for continuous, in situ biodetection of environmental contaminants
A compact, low-cost and low-powered device was developed and arranged for multiplexed biodetection of sea water contaminants from continuous flow mode. Electronics, mechanics and fluidics were designed to guarantee identical ...
Towards high performance Cd-free CZTSe solar cells with a ZnS(O,OH) buffer layer: the influence of thiourea concentration on chemical bath deposition cells
High performance kesterite (CZTSe) based solar cell devices usually employ an absorber/buffer heterostructure using toxic CdS deposited by chemical bath deposition (CBD)as buffer layer. This is due to the favourable spike ...
Spatial mapping of the collagen distribution in human and mouse tissues by force volume atomic force microscopy
Changes in the elastic properties of living tissues during normal development and in pathological processes are often due to modifications of the collagen component of the extracellular matrix at various length scales. ...
The Power of Models: Modeling Power Consumption for IoT devices
Low-energy technologies in the Internet of Things (IoTs) era are still unable to provide the reliability needed by the industrial world, particularly in terms of the wireless operation that pervasive deployments demand. ...
Localized self-heating in large arrays of 1D nanostructures
One dimensional (1D) nanostructures offer a promising path towards highly efficient heating and temperature control in integrated microsystems. The so called self-heating effect can be used to modulate the response of solid ...
Raman scattering of InSb quantum dots grown on InP substrates
In this paper we present the Raman scattering of self-assembled InSb dots grown on (001) oriented InP substrates. The samples were grown by pulsed molecular beam epitaxy mode. Two types of samples have been investigated. ...
Detection of diverse mould species growing on building materials by gas sensor arrays and pattern recognition
This work explores the detection of moulds growing in different building materials by using a metal oxide sensor array. Four moulds species have been considered. Pattern classification provides detection rates on the order ...
