120,629 research outputs found
Aprendizaje-servicio y misión cívica de la universidad. Una propuesta de desarrollo
No full text[ES] Recensión del siguiente libro: Santos Rego, M.A., Sotelino Losada, A. y Lorenzo Moledo, M.M. (2015). Aprendizaje-servicio y misión cívica de la universidad. Una propuesta de desarrollo. Barcelona: OctaedroRego Agraso, L. (2017). Aprendizaje-servicio y misión cívica de la universidad. Una propuesta de desarrollo. REDU. Revista de Docencia Universitaria. 15(1):373-376. https://doi.org/10.4995/redu.2017.6001SWORD37337615
Jet-installation noise and near-field characteristics of jet-surface interaction
No full textThe link between jet-installation noise and the near-field flow features of the corresponding isolated jet is studied by means of lattice-Boltzmann numerical simulations. The computational set-up consists of a flat plate placed in proximity to a jet, replicating the interaction benchmark study carried out at NASA Glenn. Installation effects cause low-frequency noise increase with respect to the isolated case, mainly occurring in the direction normal to the plate and upstream of the jet's exit plane. It is shown that the Helmholtz number, based on the wavelength of eddies in the mixing layer and their distance to the plate trailing edge, predicts the frequency range where installation noise occurs. Based on the isolated jet near field, scaling laws are also found for the far-field noise produced by different plate geometries. The linear hydrodynamic field of the isolated jet shows an exponential decay of pressure fluctuations in the radial direction; it is shown that the far-field spectrum follows the same trend when moving the plate in this direction. In the axial direction, spectral proper orthogonal decomposition is applied to filter out jet acoustic waves. The resultant hydrodynamic pressure fluctuations display a wavepacket behaviour, which can be fitted with a Gaussian envelope. It is found that installation noise for different plate lengths is proportional to the amplitude of the Gaussian curve at the position of the plate trailing edge. These analyses show that trends of jet-installation noise can be predicted by analysing the near field of the isolated case, reducing the need for extensive parametric investigations.Wind Energ
Levantamento semidetalhado dos solos do Campo Experimental de Monte Cristo do CPAF-Roraima.
No full textParte de: REGO, R. S.; RODRIGUES, T. E.; GAMA, J. R. N. F.; LIMA, A. A. C.; SILVA, J. M. L. da; BARRETO, W. de O. Caracterização e classificação dos solos do Campo Experimental Monte Cristo, da Embrapa Roraima, Boa Vista - Estado de Roraima. Belém, PA: Embrapa Amazônia Oriental, 2000. 40 p. (Embrapa Amazônia Oriental. Documentos, 58)
ReGO: Reference-Guided Outpainting for Scenery Image.
No full textWe present ReGO (Reference-Guided Outpainting), a new method for the task of sketch-guided image outpainting. Despite the significant progress made in producing semantically coherent content, existing outpainting methods often fail to deliver visually appealing results due to blurry textures and generative artifacts. To address these issues, ReGO leverages neighboring reference images to synthesize texture-rich results by transferring pixels from them. Specifically, an Adaptive Content Selection (ACS) module is incorporated into ReGO to facilitate pixel transfer for texture compensating of the target image. Additionally, a style ranking loss is introduced to maintain consistency in terms of style while preventing the generated part from being influenced by the reference images. ReGO is a model-agnostic learning paradigm for outpainting tasks. In our experiments, we integrate ReGO with three state-of-the-art outpainting models to evaluate its effectiveness. The results obtained on three scenery benchmarks, i.e. NS6K, NS8K and SUN Attribute, demonstrate the superior performance of ReGO compared to prior art in terms of texture richness and authenticity. Our code is available at https://github.com/wangyxxjtu/ReGO-Pytorch
Oedosphenella basuto Penado & Smit & Aguiar & Cravo & Rego & Santos & Boieiro 2020, new combination
No full textOedosphenella basuto (Munro 1957) new combination (Figs 1B, 1F) Bevismyia basuto Munro 1957: 49; Cogan & Munro 1980: 544; Norrbom et al. 1999: 105. Material examined. Holotype ♂: Original labels: “Little Bokong R. / Basutoland / 5 jan. 1947 / L. Bevis ”, “ ♂. 424. / W. 187.”, “ Holotype. / Bevismyia / basuto Mro. / det. HKMunro 1956”, “1055” (SANC). This species is only known from Lesotho.Published as part of Penado, Andreia, Smit, John, Aguiar, António Franquinho, Cravo, Délia, Rego, Carla, Santos, Renata & Boieiro, Mário, 2020, The fruit flies (Diptera, Tephritidae) of the Madeira archipelago with the description of a new Oedosphenella Frey, pp. 559-575 in Zootaxa 4810 (3) on page 567, DOI: 10.11646/zootaxa.4810.3.11, http://zenodo.org/record/394384
Mapa de aptidão agrícola das terras do Campo Experimental de Monte Cristo do CPAF-Roraima.
No full textParte de: REGO, R. S.; RODRIGUES, T. E.; GAMA, J. R. N. F.; LIMA, A. A. C.; SILVA, J. M. L. da; BARRETO, W. de O. Caracterização e classificação dos solos do Campo Experimental Monte Cristo, da Embrapa Roraima, Boa Vista - Estado de Roraima. Belém, PA: Embrapa Amazônia Oriental, 2000. 40 p. (Embrapa Amazônia Oriental. Documentos, 58)
Free-Stream Effects on Jet-Installation Noise of a Dual-Stream Engine
No full textAn investigation of the effects of free-stream on jet-installation noise is performed using a numerical solver based on the lattice-Boltzmann method. In order to simulate a realistic configuration, a high-lift wing comprised by a main element and a deployed flap (MD30P30N) is placed in the vicinity of a dual-stream engine (GE90-94B). The engine operating parameters are used as inputs to generate realistic exhaust flows. Far-field noise spectra from the isolated and installed jets, obtained through the Ffowcs-Williams and Hawkings analogy, are compared for different polar angles. In the absence of free-stream, the results show a low-frequency noise amplification, occurring mainly upstream of the jet axis. This noise increase is due to a dipole source at the flap trailing-edge, where hydrodynamic waves from the jet scatter as sound to the far-field. With free-stream, the wing produces a downward flow, which deflects the jet plume. There is a consequent change on the shear layer turbulence characteristics, which is responsible for altering the far-field spectral shape and directivity pattern of the overall configuration. Through a wavelet decomposition of the near-pressure field, coherent and chaotic fluctuations are splitted. Near-field spectra show the change in amplitude of fluctuations of coherent structures due to free-stream, which are in agreement with the farfield results.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Optimizing the removal of methylene blue from aqueous solutions using persulfate activated with nanoscale zero valent iron (nZVI) supported by reduced expanded graphene oxide(rEGO)
No full textBackground: To remove methylene blue (MB) from aqueous solutions, nanoscale zero-valent iron (nZVI) predicated
on reduced expanded graphene oxide (rEGO) was used as the activator of persulfate.
Methods: Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analyses were used to
investigate the surface morphology and to examine the surface elemental composition. X-ray diffraction (XRD) was
used to determine the chemical compositions of the synthesized compound. In this study, the effects of pH (3-9),
activator dose (0.4-1.6 g L-1), persulfate concentration (0.192-0.768 g L-1), and reaction time (0-60 minutes) on the
removal of 10 mg L-1 MB were studied by nZVI -reduced expanded graphene oxide/persulfate (nZVI@rEGO/PS)
process.
Results: The maximum removal efficiencies of MB at optimum operational conditions (pH 3, activator dose = 1.2 g
L-1, persulfate concentration = 0.576 g L-1, and reaction time = 20 minutes) by nZVI@rEGO/PS process was 96%. The
chemical method was used to prepare expanded graphene. The volume of natural flake graphite increased about 25
times after the process. SEM image of the nZVI@rEGO showed the presence of nZVI placed on the EGO surface in
chain structure with a diameter about 100 nm. The EDS analysis of the activator indicated the existence of Fe element
to an amount greater than 50%.
Conclusion: According to the results, nZVI@rEGO is considered as a promising activator of persulfate.
Keywords: Persulfate, Methylene blue, Graphite, Graphene oxide, Kinetic
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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