A5077188569- Semiconductor Quantum Structures and Devices
- Quantum and electron transport phenomena
- Advanced MIMO Systems Optimization
- Autonomous Vehicle Technology and Safety
- Software-Defined Networks and 5G
- Quantum optics and atomic interactions
- Strong Light-Matter Interactions
- Robot Manipulation and Learning
- Advanced Wireless Communication Technologies
- Spectroscopy and Quantum Chemical Studies
- Traffic and Road Safety
- Cooperative Communication and Network Coding
- Semiconductor Lasers and Optical Devices
- Software System Performance and Reliability
- Occupational Health and Safety Research
- Quantum Dots Synthesis And Properties
- Telecommunications and Broadcasting Technologies
- Energy Harvesting in Wireless Networks
- Digital Transformation in Industry
- Muscle activation and electromyography studies
- Atomic and Molecular Physics
- Network Security and Intrusion Detection
- Magnetic properties of thin films
- Advanced Chemical Sensor Technologies
- Anomaly Detection Techniques and Applications
Ericsson (Sweden)
2021-2024
Universidade Federal de Pernambuco
2024
Universidade Federal do Pará
2024
Universidade de Pernambuco
2024
John Wiley & Sons (United Kingdom)
2021
University of California, Berkeley
1996-2003
Lawrence Berkeley National Laboratory
1997-2003
Universidade Estadual de Campinas (UNICAMP)
1991-2000
Autonomous Vehicles (AV) are expected to bring considerable benefits society, such as traffic optimization and accidents reduction. They rely heavily on advances in many Artificial Intelligence (AI) approaches techniques. However, while some researchers this field believe AI is the core element enhance safety, others imposes new challenges assure safety of these AI-based systems applications. In non-convergent context, paper presents a systematic literature review paint clear picture state...
The possibility of using a minimal-volume photoacoustic cell to perform spectroscopy samples is discussed. It shown that this alternative signal-to-noise-enhanced configuration allows one obtain both absorption and transmission spectra with minimal experimental arrangement machining requirements. theoretical model presented, the use which exemplified by complete optical thermal characterization leaves.
We present investigations of fs time resolved coherent wave mixing under high magnetic field. Our experiments reveal a new regime at field and low excitation density dominated by the Coulomb interaction. This is inconsistent with semiconductor Bloch equations. A model which includes exciton-exciton correlation successfully describes many features this regime.
This work proposes a scalable access point (AP) selection framework based on competitive mechanism that operates in two stages. Initially, the user equipment (UE) connects to an intermediate AP cluster, where matched-decision among APs and UEs establishes best connection terms of large-scale fading prevents from being dropped. Then, can expand their clusters by connecting more APs. We compare our method with baseline solutions considering different precoding techniques centralized...
Globalization, digitalization, and urbanization are progressing at a fast pace in cities regions across the world. New technologies innovations typically reach urban first, where Return on Investment (ROI) tends to be higher than remote or rural areas, which characterized by low population densities, potential revenues, large distances clusters societal service. This process has consistently increased digital urban-rural gap. As an example, Fifth Generation of Mobile Network (5G) recently...
IoT devices suffer from resource limitations, such as processor, RAM, and disc storage. These limitations become more evident when handling demanding applications, deep learning, well-known for their heavy computational requirements. A case in point is robot pose estimation, an application that predicts the critical points of desired image object. One way to mitigate processing storage problems compressing learning application. This paper proposes a new CNN estimation while applying...
We have calculated the electronic structure of spherical PbS, PbSe, and PbTe quantum dots using a four-band envelope-function formalism that accounts for band anisotropy. By comparing our results with an analytical calculation assumes approximation $\stackrel{\ensuremath{\rightarrow}}{k}\ensuremath{\cdot}\stackrel{\ensuremath{\rightarrow}}{p}$ Hamiltonian, we show effects anisotropy are more pronounced excited states increase confinement. also how same technique can be applied to ellipsoidal dots.
We study the transition from a dense continuum to sparse quasicontinuum in Fano problem. Transmission measurements on epitaxial layers of GaAs high magnetic field and calculations optical absorption show how interference disappears as quantum confinement discretizes states. The between quasi-one-dimensional quasi-zero-dimensional systems occurs at length scales which are unusually large for experiments.
The next generation of mobile communication system will allow a plethora new services and use cases. By offering support for high throughput connections, low latency response massive number the fifth network trigger applications unseen in any other network. However, one important application scenario is not being properly addressed by players responsible networks' standardization, that remote rural areas This requires large cells with throughput, flexibility to opportunistically exploit free...
We present a study of carrier dynamics in GaAs during and just after creation by ultrashort laser pulses. observe quasi-instantaneous spread the population momentum-energy space. Attempts to fit scattering rates relaxation time approximation result parameters outside range validity theory. interpret this as failure Boltzmann kinetic approach quantum regime.
Mean-field, Hartree-Fock theory has been successful in explaining many nonlinear optical experiments semiconductors. But recently have shown important cases where the mean-field (the semiconductor Bloch equations) fails. One such case is bulk GaAs a strong magnetic field. Here exciton-exciton interaction can be tuned by varying field, providing an excellent method for studying transition from regime valid to correlations must taken into account. We perform ultrafast time-resolved four-wave...
Fourier transform spectral interferometry is applied to measure both amplitude and phase of the electric field in different types semiconductor nanostructures, thus determining real imaginary parts dielectric function. The importance measuring shown discussed three studies. First, measurement used access directly refractive index across excitonic resonances bulk GaAs AlGaAs-GaAs quantum wells, with unprecedented resolution. Second, we density dependence full function a Fano resonance show...
We present simultaneous measurement of the refractive index and absorption coefficient in a AlGaAs/GaAs multiple quantum well structure near band gap by Fourier transform spectral interferometry. Both quantities were measured across heavy- light-hole excitons for temperatures ranging from liquid helium to room temperature. The experimental results are analyzed using an analytical expression complex dielectric function Wannier fractional dimension.
An open-cell photoacoustic (OCPA) spectroscopic technique is described which can assess genetically rooted differences in the response of live specimens corn (Zea Mays L.) to toxic action aluminium. Specimens from a susceptible and tolerant inbred line were examined. The their OCPA vivo leaf spectra evident an interpretation given based on controlled inbreds aluminium toxicity. earlier discrimination among obtained with this than has been possible so far previous techniques.
We investigated the optical properties of lattice-matched InGaAs/InP quantum wells grown by metalorganic molecular beam epitaxy on top patterned InP buffer layers with elongated features along [01̄1] direction. The resulting present a periodic thickness variation following features. Low temperature luminescence measurements exhibit double emission bands, attributed to distinct regions well. Temperature evolution photoluminescence spectra gives qualitative information about effect exciton...
We study the effects of photocarrier density on a magnetically induced Fano resonance in GaAs, using combined phase-amplitude transmission spectroscopy technique. By comparing our results to an extension model we measure relative contributions two, usually undistinguished, photocarriers: screening inter-Landau-level Coulomb coupling, and collisional broadening coupled discrete-state/continuum natural linewidth.
We present a study on the exciton dynamics in thin quantum well grown with self-assembled islands thicknesses ranging from 1 to 5 ML. The is investigated by combinining continuous-wave and time-resolved photoluminescence measurements as function of temperature. analyze through system rate equations we are able obtain quantitative information localization at interface roughness. \textcopyright{} 1996 American Physical Society.