A5038512228- Nuclear Physics and Applications
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ion-surface interactions and analysis
- Atomic and Molecular Physics
- Advanced DC-DC Converters
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Advanced X-ray and CT Imaging
- Transition Metal Oxide Nanomaterials
- Advanced Memory and Neural Computing
- Medical Imaging Techniques and Applications
- Advancements in Photolithography Techniques
- Astronomical and nuclear sciences
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Multilevel Inverters and Converters
- Advanced X-ray Imaging Techniques
- Corrosion Behavior and Inhibition
- Radioactive contamination and transfer
- Electronic and Structural Properties of Oxides
Universidade de São Paulo
2014-2025
Universidade Federal do Maranhão
2025
Instituto Butantan
2024
Brazilian Center for Research in Energy and Materials
2015-2021
Brazilian Synchrotron Light Laboratory
2007-2020
Universidade Cidade de São Paulo
2011-2019
Japan External Trade Organization
2015
Universidade de Santo Amaro
2011
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2011
Abstract Clastic sedimentary systems and their characteristics are assumed not to have been modified by carbonate bioclastic grains until the Phanerozoic. Here, we show that presence of bioclasts produced disintegrated biomineralizing metazoans fine-grained siliciclastic facies in Late Ediacaran Tamengo Formation, Brazil, ca. 555–542 Ma. The analysis both polished sections thin shows sand-sized (< 2 mm) derived from metazoan Corumbella created diverse features later found Phanerozoic...
ABSTRACT Context Despite the benefits of exercise for older people’s health, there is little research on with elastic bands and arterial stiffness hemodynamic markers, specifically women. Such important because women tend to live longer than men comprise most adult population. Objective The aim this study investigate effects different protocols women’s stiffness, functional parameters, body composition. Design will be a randomized controlled trial. Setting This focuses possibilities low-cost...
This paper focuses on diamond-like carbon (DLC) films for space applications. Specifically, it reports the structure, morphology, adhesion, and high-vacuum tribological performance of several DLC with different hydrogen content. have been studied as a promising solid lubricant since liquid lubricants are ineffective undesirable many The were deposited by pulsed Direct Current Plasma Enhanced Chemical Vapor Deposition (DC PECVD) technique an additional cathode. An amorphous silicon interlayer...
Helium plasmas are attractive reagents for the removal of organics from hybrid materials because their minimal ablative power and relative inertness, compared to oxidizing feed gases such as O2 highly inert Ar. This work describes use dilute helium selectively remove organic ligands films colloidal nanoparticles (i.e., nanoparticle assemblies). We determine contribution etching different plasma species in a model system consisting ZrO2 capped with trioctylphosphine oxide. Unexpectedly, we...
We here describe a bottom-up approach to control the composition of solid/solid interfaces in nanostructured materials, and we test its effectiveness on tetragonal ZrO2, an inorganic phase great technological significance. Colloidal nanocrystals capped with trioctylphosphine oxide (TOPO) or oleic acid (OA) are deposited, organic fraction ligands is selectively etched O2 plasma. The resulting all-inorganic colloidal nanocrystal assemblies either nearly bare (for OA-capped nanocrystals)...
This work describes the new facility for applied nuclear physics at University of Sao Paulo, mainly irradiation electronic devices. It is a setup composed quadrupole doublet beam focusing/defocusing plus multiple scattering through gold foils to produce low intensity, large-area, and high-uniformity heavy-ion beams from 1H 107Ag. Beam intensities can be easily adjusted 102 particles cm2/s hundreds nA an area as large 2.0 cm2 uniformity better than 90%. Its chamber has high-precision...
Background: Resonances around $x\ensuremath{\alpha}$ thresholds in light nuclei are recognized to be important basic aspects of nuclear structure. However, there is scarce experimental information associated with them.Purpose: We study the $\ensuremath{\alpha}$-clustering phenomenon resonant states $4\ensuremath{\alpha}$ threshold (14.44 MeV) ${}^{16}\text{O}$ nucleus.Method: The ${}^{12}\text{C}{(}^{6}\text{Li},d){}^{16}\mathrm{O}$ reaction was investigated an unprecedented resolution at a...
This paper proposes an architecture of digital current regulator intended to be used control the power supplies new Brazilian synchrotron light source, called Sirius. It is based on a high-precision Digital Analog Converter and modern System Chip device, which has capability performing realtime tasks together with managing interface tasks. Despite this system will many kinds supplies, it was validated in 100 W supply, previously developed present Synchrotron Light Source.
We measured the cross sections for Au Lα, Lβ, Lγ, Lℓ and Lη x-ray production by impact of electrons with energies from L3 threshold to 100 keV using a thin film whose mass thickness was determined Rutherford Backscattering Spectrometry. The spectra were acquired Si drift detector, which allowed separate components Lγ multiplet lines. , L, then employed derive L1, L2 subshell ionization relative uncertainties 8%, 7% 7%, respectively; these figures include in atomic relaxation parameters....
This paper describes the kinetic limitations of etching ligands from colloidal nanocrystal assemblies (CNAs) by plasma processing. We measured kinetics a CNA model system (spherical ZrO2 nanocrystals, 2.5-3.5 nm diameter, capped with trioctylphosphine oxide) inductively coupled plasmas (He and O2 feed gases, powers ranging 7 to 30 W, at pressures 100 2000 mTorr exposure times between 6 168 h). The rate slows down about one order magnitude in first minutes etching, after which carbon removal...
In this work we present a combined experimental and theoretical study of $K$-shell ionization by electrons with energies close to the threshold. The cross sections $K$ shells Te, Ta, Bi atoms have been measured up 100 keV uncertainties ranging from 4% 8%. turn, calculations done using subconfiguration average distorted-wave (SCADW) method, which includes full two-body retarded electromagnetic interaction between projectile target electrons. predictions SCADW method are in good agreement...
Sirius is a Synchrotron Light Source Facility based on 4th generation low emittance storage ring that presently under construction in Campinas, Brazil. During the last year, accelerator activities concentrated R&D of various subsystem components. However, number components production or already delivered also increasing according to planning. The building started beginning 2015 and machine commissioning expected start mid 2018. In this paper we report present status project with emphasis...
Alpha resonant states in 13 C up to 15 MeV were excited by the 9 Be ( 6 Li , d ) reaction. The data taken at a bombarding energy of 25.5 employing São Paulo-Pelletron-Enge Split Pole facility and nuclear emulsion technique. resolution 50 keV allowed for separation contributions known 7/2 - (5/2 near + α threshold both associated with an L = 4 transfer. Several narrow alpha not previously measured detected, particular one 3α n populated 2 transfer, revealing 9Be component 1/2 cluster state...
We have used the low-energy beam line of Sao Paulo Microtron accelerator to study maximum energy transfer point (tip) electron–atom bremsstrahlung spectra for C, Al, Te, Ta and Au. Absolute cross sections differential in angle emitted photon were measured various electron kinetic energies between 20 100 keV, emission angles 35◦, 90◦ 131◦. The collected with three HPGe detectors their response functions evaluated analytically. Rutherford backscattering spectrometry allowed us obtain...