SignificancePeople with Parkinson's disease (PD) experience changes in fine motor skills, which is viewed as one of the hallmark signs this disease. Due to its non-invasive nature and portability, functional near-infrared spectroscopy (fNIRS) a promising tool for assessing related skills.AimWe aim compare activation patterns primary cortex using fNIRS, comparing volunteers PD sex- age-matched control participants during task walking. Moreover, inter intrahemispheric connectivity (FC) was...

à la diffusion de documents scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement et recherche français étrangers, laboratoires publics privés.

Seebeck nanoantennas, which are based on the thermoelectric effect, have been proposed for electromagnetic energy harvesting and infrared detection. The responsivity frequency dependence of three types nanoantennas is obtained by simulation different materials. Results show that square spiral antenna has widest bandwidth highest induced current analyzed geometries. However, geometry presented temperature gradient was bowtie antenna, favors effect in a nanoantenna. results also these devices...

In this work, we report the fabrication of self-assembled zinc oxide nanorods grown on pentagonal faces silver nanowires by using microwaves irradiation. The nanostructures resemble a hierarchal nanoantenna and were used to study far near field electrical metal-semiconductor behavior from radiation pattern resulting phase map reconstruction obtained off-axis electron holography. As comparison, use electric numerical approximations methods for finite number ZnO Ag show that intensities maps...

Precipitation of silver nanoparticles at 70°C was carried out by dosing a 1.3 M sodium borohydride aqueous solution over bicontinuous microemulsions formed with mixture bis(2‐ethylhexyl) sulfosuccinate (AOT) and dodecylsulfate (SDS) as surfactants, 0.5 nitrate solution, toluene. Weight ratios 2.5/1 3/1 AOT/SDS were used in the precipitation reactions. Silver characterized transmission electronic microscopy, X‐ray diffraction, atomic absorption spectroscopy. A isolated spheroidal ( ≈ 15 wt.%)...

We compared 9 × arrays of bimetallic Ni(Nickel)-Pt(Platinum) nanoantennas for a classic and evolutive dipole configuration. fabricated the by e-beam lithography characterized them with solar simulator to analyze I − V curves. From these curves, thermoelectric voltage dependence associated configuration was observed. show that (EDN) generate up three times more in contrast nanoantenna (CDN). Indeed, is 1.3 efficient than its classical counterpart. The results are corroborated absorbance 20 36...

Printed circuit antennas have been used for the detection of electromagnetic radiation at a wide range frequencies that go from radio (RF) up to optical frequencies. The design printed has done by using rules derived frequency domain which do not take into account dispersion material parameters This can make traditional RF antenna suitable design. work presents results genetic algorithm (GA) obtaining an optimized geometry (unconventional geometries) may be as regime capture waves. patterns...

A drive converter for light emitting diodes (LEDs) is presented. The driver based on a half-bridge self-oscillating (SOC) and uses variable frequency to reduce the output current fluctuation due input voltage ripple coming from previous power factor corrector (PFC) stage. proposal prototype employs discrete circuit with series resonant tank simple control circuit. topology no electrolytic capacitors experimental results shows feasibility of proposal.

Nanoantennas have been fabricated by scaling down traditional antenna designs using nanolithographic techniques and testing them at different optical wavelengths, these particular nanoantennas shown responses in a broad range of frequencies going from visible wavelengths to the terahertz. Some self-assembled nanostructures exist that exhibit similar shapes properties those structures. In this work emission absorption made zinc oxide nanorods on silver nanowires, which resemble dipole...

Recently thermo-electrical nanoantennas, also known as Seebeck have been proposed an alternative for solar energy harvesting applications. In this work we present the optical and thermal analysis of metallic nanoantennas operating at infrared wavelengths, study is performed by numerical simulations using COMSOL Multiphysics. Several different nanoantenna designs were analyzed including dipoles, bowties square spiral antennas. Results show that can be tuned to absorb electromagnetic...

The field of plasmonics, an optics discipline that studies the interaction light with matter for structures dimensions similar to wavelength electromagnetic radiation affecting them, has been further developed support computational technologies are capable performing calculations large volumes data solve complex problems this discipline. Some in plasmonics require use algorithmic techniques can simultaneously handle more than one function tend not present their maximum or minimum at same...

In this work, the bolometric parameters of Sierpinski fractal antenna-coupled SWCNT semi-metallic films are obtained by thermoelectric characterization, in order to find out performance as bolometer. The method was based on an experimental setup considering a line-of-sight wireless link between two identical planar antennas, infrared thermography, and electrical resistance measurements. considered antennas resonant frequencies. Both transmitting receiving antenna were third-iteration dipoles...

Abstract The biotechnology sector is focusing on developing biosensors that allow us to detect and monitor substances in vivo using non-invasive methods. For example, detection the label-less method, radiation mid-infrared (mid-IR) has been used obtain vibrational fingerprint. In this work, we propose use plasmonic nanoantennas called spaceship develop a SEIRA substrate can be disease detection. were fabricated electron beam lithography. A potential device was with Au based crop circles...

Objetivo. Dimensionar y caracterizar la pobreza energética en población indígena del Estado de San Luis Potosí, México. Metodología. Se diseñó, validó aplicó, mediante muestreo estadístico aleatorio, un instrumento tipo cuestionario los cinco municipios indígenas con mayores tasas marginación. Los datos recolectados fueron capturados analizados estadísticamente. Resultados. La vertiente más grave está el acceso a combustibles no contaminantes, dado que uso leña hogares alcanza 93.2 %,...

We have used photoreflectance-anisotropy (PRA) spectroscopy as an optical probe for the characterization of heterostructure lasers with active region consisting InAs quantum dots (QDs) embedded in a series three stacked In <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.15</inf> Ga xmlns:xlink="http://www.w3.org/1999/xlink">0.85</inf> As wells (QWs). By probing in-plane anisotropy, we demonstrate that PRA has ability to detect and...

A study on the geometry of antennas is proposed in order to find those that provide optimal conditions operation for applications terahertz range. We used an analysis based evolutionary algorithms purpose, showing geometries are not similar radio frequency applications.

We present an analogy between the one dimensional Poisson equation in inhomogeneous media and Dirac space dimension with a Lorentz scalar potential for zero energy. illustrate how energy state Jackiw-Rebbi model can be implemented simple electrostatic setting by using electric permittivity infinite charged sheet. Our approach provides novel insight into helpful view teaching this important quantum field theory basic electrostatics.

En este trabajo se reporta la fabricación de un dispositivo láser semiconductores III-V confinamiento separado. La heteroestructura creció usando técnica epitaxia por haces moleculares y caracterizó óptica, topográfica eléctricamente medio fotoluminiscencia, microscopia tunelamiento, electroluminiscencia, relaciones corriente-voltaje corriente-potencia, respectivamente. El electrónico es llevado a cabo emparedamiento del área activa con pozos cuánticos InGaAs una composición que permite...

Se presenta el estudio de nanoantenas geometría estelar como elementos plasmónicos amplificadores y direccionales del campo electromagnético. El se llevó a cabo con análisis numérico basado en la técnica elemento finito. Fueron analizados varios materiales, dimensiones arreglos geométricos frecuencias para simulación datos. La fue elegida base propiedad autoensamblado los materiales plata-óxido zinc (Ag-ZnO). direccionalidad amplificación eléctrico fueron simulados tanto cercano...

Se presenta un método para modelado geométrico aplicando algoritmo genético en el que la población (individuos) son los puntos de control curvas Bézier primer, segundo o tercer grado. Con aplicación este se obtienen figuras sólidas, continuas y suavizadas discuten algunas aplicaciones van desde ingeniería nanomateriales, pasando por prótesis hasta macro estructuras mecánicas complejas ciencias sociales.

We report the visualization of interface optical anisotropies in III-V semiconductor based coupled double quantum wells by using photoreflectance anisotropy spectroscopy. Interfacial were detected from buried layers with dimensions at room temperature through a piezoelectric shear strain. The discrete transitions associated to observed near-infrared range, specifically second telecommunication band. propose use this extended spectroscopy polarization contrast as simple and complementary...