55 documents found, page 1 of 6
Al2O3 ultra-thin films deposited by PEALD and ThALD for rubidium optically pump...
Cunha, F. M.; Silva, M. F.; Correia, J. H.[Excerpt] The Atomic Layer Deposition (ALD) technique can be used to improve the rubidium optically pumped atomic magnetometers (OPMs) cell lifetime with a conformal deposition of Al2O3 ultra-thin film on the internal cell walls as a protective coating avoiding the disappearance of the alkaline metal vapor over time. In this work, 10 nm thick Al2O3 ultra thin-films by ThALD and by PEALD were deposited and compa...
Effects of nanoscale spatial inhomogeneity in strongly correlated systems
Silva, M. F.; Lima, N. A.; Malvezzi, A. L. [UNESP]; Capelle, K.Made available in DSpace on 2022-04-28T20:00:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-03-15; We calculate ground-state energies and density distributions of Hubbard superlattices characterized by periodic modulations of the on-site interaction and the on-site potential. Both density-matrix renormalization group and density-functional methods are employed and compared. We find that small variati...
Detection of low-magnetic fields by rubidium (87Rb) vapor cell
Maciel, Marino Jesus Correia; Silva, M. F.; Pimenta, Sara Filomena Ribeiro; Correia, J. H.This paper describes the work carried out to assess the use of a quartz reference rubidium (87Rb) vapor cell for non-invasively magnetoencephalography, avoiding cryogenically cooled sensors as the Superconducting Quantum Interference Devices (SQUIDs). An experimental setup based on a cylindrical glass vapor cell of 87Rb (l = 75 mm, d =19 mm) was developed. The 87Rb cell was heated to around 75°C and it was opti...
Natural additives can replace the conventional growth promoters in cattle feedl...
D'Aurea, A. P.; Fernandes, L. B.; Oliveira, A. P.; Ferreira, L. E.; Lima, M. M. [UNESP]; Limede, A. C.; Silva, M. F.; Chizzotti, M. L.Made available in DSpace on 2021-06-25T11:51:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01; Premix(R) Company; The objective of this research was to evaluate a natural additive to replace the conventional growth promoters in finishing beef cattle diets. Eighty Nellore bulls were assigned into two treatments, where the only difference was the additive used: either natural additive (N = Fator P ...
The missing study: a characterization of peer education practice
Silva, M. F.; Matos, A. D.; Henriques, S.Peer education interventions have grown significantly in recent decades, but sociological studies on the subject are limited. To respond to this need, we carried out an exhaustive inventory and characterization of 67 peer education projects developed in Portugal. The information given by the project managers was processed using a content analysis technique. This practice is growing, benefiting from public and p...
Stability of BEC Systems in Nonlinear Optical Lattices
Tomio, Lauro [UNESP]; Abdullaev, F. K.; Luz, H. L. F. da; Gammal, A.; Machado, JAT; Luo, ACJ; Barbosa, R. S.; Silva, M. F.; Figueiredo, L. B.Made available in DSpace on 2020-12-10T19:33:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-01-01; The dynamics and stability of a Bose-Einstein Condensate, described by a two-dimensional nonlinear Schrodinger equation in a one-dimensional conservative plus dissipative nonlinear optical lattice, are investigated. In the case of focusing media (with attractive atomic systems), the collapse of the wave...
Ecofisiologia da germinação e crescimento inicial de Physocalymma scaberrimum P...
Silva, M. F.Submitted by Alison Souza (alisonsouza@ufgd.edu.br) on 2020-02-04T15:40:40Z No. of bitstreams: 1 FrancieliMoreiradaSilva.pdf: 1109755 bytes, checksum: b6ebbdc125844a21f12ab1abaff0747d (MD5); Made available in DSpace on 2020-02-04T15:40:40Z (GMT). No. of bitstreams: 1 FrancieliMoreiradaSilva.pdf: 1109755 bytes, checksum: b6ebbdc125844a21f12ab1abaff0747d (MD5) Previous issue date: 2015-02-27; Devido à carência de...
High-performance μ-thermoelectric device based on Bi2Te3/Sb2Te3 p-n junctions
Vieira, Eliana Maria Fernandes; Pires, A. L.; Silva, José Pedro Basto; Magalhães, V. H.; Grilo, J.; Brito, F.P.; Silva, M. F.; Pereira, A. M.A flexible and ultralight planar thermoelectric generator based on 15 thermocouples composed of n-type bismuth telluride (Bi2Te3) and p-type antimony telluride (Sb2Te3) legs (each with 400 nm thick) connected in series, on 25 μm thick Kapton substrate, was fabricated with impressive power factor values of 2.7 and 0.8 mW K-2 m-1 (at 298 K) for Bi2Te3 and Sb2Te3 films, respectively. The p-n junction thermoelectri...
Photodynamic therapy at low-light fluence rate: "in vitro" assays on colon canc...
Rodrigues, J. A.; Amorim, Ricardo; Silva, M. F.; Baltazar, Fátima; Wolffenbuttel, R. F.; Correia, J. H.This paper presents the results of in vitro photodynamic therapy assays on RKO and HCT-15 cell lines. The envisaged implementation is in autonomous medical microdevices, such as endoscopic capsules for clinical treatment of several types of gastrointestinal tract tumors. Because of their very limited device volume, light fluence and fluence rate needed to destroy tumor cells should be minimized. Foscan or meta-...
Design and fabrication of thin-walled reservoir based on microcasting assisted ...
Rodrigues, José Artur Oliveira; Silva, M. F.; Puga, Hélder; Correia, J. H.This paper presents a solution to implement neutral argon plasma (NAP) in minimally invasive medical devices for therapeutic endoscopy. The NAP system is composed of compressed inert gas (argon), two electrodes, and a high-voltage source to ionise the argon. The miniaturisation of an argon reservoir is required. Finite-element method simulations of small reservoirs of an aluminium alloy with thicknesses of 0.2,...