2,551 research outputs found
Brasil x Espanha: consumo de energia térmica e emissões de CO2 envolvidos na fabricação de revestimentos cerâmicos
A demanda de energia térmica da indústria de revestimentos cerâmicos é bastante elevada, sendo atendida quase por completo pela combustão do gás natural. Os gastos com geração de energia térmica representam uma grande parte do custo de produção de revestimentos cerâmicos, e as emissões de CO2 resultantes desta atividade industrial são muito expressivas. Neste sentido, o aumento da eficiência térmica nos processos produtivos conhecidos atualmente deve ser buscado constantemente com o objetivo de reduzir o custo de fabricação e as emissões de CO2. Para isso, é necessário dispor de uma base de dados de consumos energéticos e emissões de CO2, a fim de conhecer a situação atual do setor e as possibilidades de aumentar a eficiência energética do processo. Dessa forma, o presente trabalho foi realizado com o objetivo de levantar dados baseados em medições diretas em equipamentos industriais consumidores de gás natural, no Brasil e na Espanha, utilizando a mesma metodologia. Foram visitadas 65 empresas e analisados 130 equipamentos, sendo possível estabelecer comparações entre o consumo de diversas tipologias de produtos, etapas do processo produtivo, distintas rotas de processamento, equipamentos com características construtivas diferenciadas, dentre outros. As informações obtidas constituem um inédito banco de dados que representa a real situação dos setores de revestimentos cerâmicos do Brasil e da Espanha, com respeito ao consumo energético e às emissões de CO2
Multiple Mini Interviews for Selection of Residents and Fellows in a Cardiovascular Center: A 5-year
Introducción: las mini entrevistas múltiples (MME) son un modelo para evaluar las habilidades no cognitivas en la selección de profesionales ingresantes a instituciones médicas. Objetivo: el objetivo de este trabajo fue evaluar la factibilidad, confiabilidad y la aceptabilidad de las MME para la selección de residentes y fellows en un centro cardiovascular en los últimos 5 años. Material y métodos: se realizó un estudio observacional, en el cual se incluyeron consecutivamente postulantes a la residencia de Cardiología y a las especialidades de Medicina Nuclear y Ultrasonido en los años 2018, 2019 y 2022. Se desarrollaron diez estaciones para evaluar diferentes dominios no cognitivos. La confiabilidad se evaluó mediante el coeficiente G de generalización. Además, se encuestó a postulantes y entrevistadores para evaluar la aceptabilidad de las MME, y se evaluó la factibilidad en términos de tiempo dedicado al proceso. Resultados: un total de 75 postulantes participaron de las MME. A partir del estudio G se obtuvieron coeficientes de confiabilidad de 0,62 y 0,61 acorde al diseño. Fue factible su implementación y el 92% de los postulantes valoró de manera muy positiva a las MME. El 90% de los entrevistadores refirió tener suficiente tiempo para evaluar a los participantes y que el proceso no era excesivamente agotador. Conclusión: las MME son un método novedoso en nuestro medio. Demostraron ser confiables y con un elevado nivel de aceptabilidad para la evaluación de habilidades no cognitivas en el proceso de selección de postulantes a residencia de Cardiología y de subespecialidades en un centro cardiovascular.Background: Multiple mini-interviews (MMIs) serve as a model to evaluate non-cognitive skills in the admission process of health care professionals. Objective: The aim of this study was to evaluate the feasibility, reliability and acceptability of the MMI model for the selection of residents and fellows in a cardiovascular center in the past 5 years. Methods: We conducted an observational study including applicants to the cardiology residency program and to the fellowship in Nuclear Medicine and Cardiovascular Ultrasound in 2018, 2019 and 2022. Ten stations were developed to evaluate different non-cognitive domains. Reliability was assessed using G-coefficient. Applicants and interviewers were also surveyed to assess the acceptability of the MMI model and its feasibility in terms of the time required for the process. Results: A total of 75 applicants participated in the MMIs. The G study showed reliability coefficients of 0.62 and 0.61 according to the design. Implementation was feasible; 92% of applicants gave positive reviews to the MMI model, and 90% of interviewers reported they had sufficient time to assess the participants and that the process was not an excessively exhausting. Conclusion: MMIs are a novel method in our setting, demonstrating reliability and a high level of acceptability for evaluating non-cognitive skills in the selection process of applicants to the cardiology residency program and fellowships in a cardiovascular center.Fil: Fasan, Martín A.. Instituto Cardiovascular de Buenos Aires; ArgentinaFil: Burgos, Lucrecia María. Instituto Cardiovascular de Buenos Aires; ArgentinaFil: Sigal, Alan. Instituto Cardiovascular de Buenos Aires; ArgentinaFil: Costabel, Juan Pablo. Instituto Cardiovascular de Buenos Aires; ArgentinaFil: Alves de Lima, Alberto Enrique. Instituto Cardiovascular de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Through-space hopping transport in an iodine-doped perylene-based metal-organic framework
Electrically conductive metal-organic frameworks (MOFs) have emerged in the past few years as promising materials towards applications in (opto)electronics, electrocatalysis and energy storage, among others. One of the most common strategies for the design of conductive MOFs is based on the use of electroactive organic ligands and their partial oxidation/reduction to increase the number of charge carriers. Although perylene salts were reported as the first molecular conductors, they have been scarcely explored as building blocks for the construction of conductive MOFs. Herein we report the electrical conductivity enhancement of a microporous perylene-based MOF upon partial ligand oxidation by using two-probe single-crystal devices. The origin of the conductivity enhancement is rationalised by means of spectroscopic studies and quantum-chemical calculations, supporting a through-space hopping transport along the herringbone perylene packing. This study opens the way for the design of conductive MOFs based on perylene building blocks.This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, Grants UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. We thank FCT for funding the project PTDC/QUI-ELT/2593/2021. We acknowledge Spanish government (PID2020-119748GA-I00, funded by MICIN/AEI/10.13039/501100011033, and the Maria de Maeztu CEX2019-000919-M grant) and Generalitat Valenciana (GV/2021/027, GVPROMETEO2020-077). G. V. is grateful to FCT for a PhD grant (2020.08520.BD). A. P. is grateful to FCT for a PhD grant (2020.06159.BD). FCT is also acknowledged by M. I. for a Junior Researcher Position (CEECIND/00546/2018). We thank Celeste Azevedo for TGA and Raman measurements. We thank Prof. Luís Carlos and Prof. Carlos Brites (Phantom-G) for the use and assistance with spectrofluorimeter and quantum yield equipment. We thank Prof. Nikolai Sobolev for EPR measurements
Through-space hopping transport in an iodine-doped perylene-based metal–organic framework
Electrically conductive metal-organic frameworks (MOFs) have emerged in the past few years as promising materials towards applications in (opto)electronics, electrocatalysis and energy storage, among others. One of the most common strategies for the design of conductive MOFs is based on the use of electroactive organic ligands and their partial oxidation/reduction to increase the number of charge carriers. Although perylene salts were reported as the first molecular conductors, they have been scarcely explored as building blocks for the construction of conductive MOFs. Herein we report the electrical conductivity enhancement of a microporous perylene-based MOF upon partial ligand oxidation by using two-probe single-crystal devices. The origin of the conductivity enhancement is rationalised by means of spectroscopic studies and quantum-chemical calculations, supporting a through-space hopping transport along the herringbone perylene packing. This study opens the way for the design of conductive MOFs based on perylene building blocks.publishe
A seca e a crise hídrica de 2014-2015 em São Paulo
During most of the rainy season in 2014, the Southeast of Brazil – including the Cantareira reservoir system – received below-normal rainfall. The main cause leading to that heavy lack of rain was an intense, persistent and anomalous highpressure system blocking moisture flow from the Amazon and the development and passage of cold front systems and the South Atlantic Convergence Zone, which are responsible for rainfall in this region during summer. This blocking system lasted for 45 days, which is extremely rare. Low rainfall amounts coupled with an increased demand for water and an inefficient water management system led to the so-called “water crisis” during 2014, which extended into 2015A maior parte da estação chuvosa de 2014 transcorreu com valores de chuva inferiores à média histórica sobre a porção sudeste do país, incluindo o Sistema Cantareira. A causa principal para a grande falta de chuva foi a atuação de um intenso, persistente e anômalo sistema de alta pressão atmosférica que prejudicou o transporte de umidade da Amazônia, assim como a passagem/ desenvolvimento dos principais sistemas causadores de chuva, como a Zona de Convergência do Atlântico Sul e as frentes frias. Esse sistema, denominado de bloqueio atmosférico, teve uma duração de 45 dias, fato que resulta extremamente raro. A combinação dos baixos índices pluviométricos, o grande crescimento da demanda de água e o ineficiente gerenciamento desse recurso têm gerado uma “crise hídrica” durante os anos 2014 e 201
Planck intermediate results. XXIII. Galactic plane emission components derived from Planck with ancillary data
Galactic structure, stellar clusters and populations.-- et al.Planck data when combined with ancillary data provide a unique opportunity to separate the diffuse emission components of the inner Galaxy. The purpose of the paper is to elucidate the morphology of the various emission components in the strong star-formation region lying inside the solar radius and to clarify the relationship between the various components. The region of the Galactic plane covered is l = 300° → 0° → 60° wherestar-formation is highest and the emission is strong enough to make meaningful component separation. The latitude widths in this longitude range lie between 1° and 2°, which correspond to FWHM z-widths of 100−200 pc at a typical distance of 6 kpc. The four emission components studied here are synchrotron, free-free, anomalous microwave emission (AME), and thermal (vibrational) dust emission. These components are identified by constructing spectral energy distributions (SEDs) at positions along the Galactic plane using the wide frequency coverage of Planck (28.4−857 GHz) in combination with low-frequency radio data at 0.408−2.3 GHz plus WMAP data at 23−94 GHz, along with far-infrared (FIR) data from COBE-DIRBE and IRAS. The free-free component is determined from radio recombination line (RRL) data. AME is found to be comparable in brightness to the free-free emission on the Galactic plane in the frequency range 20−40 GHz with a width in latitude similar to that of the thermal dust; it comprises 45 ± 1% of the total 28.4 GHz emission in the longitude range l = 300° → 0° → 60°. The free-free component is the narrowest, reflecting the fact that it is produced by current star-formation as traced by the narrow distribution of OB stars. It is the dominant emission on the plane between 60 and 100 GHz. RRLs from this ionized gas are used to assess its distance, leading to a free-free z-width of FWHM ≈ 100 pc. The narrow synchrotron component has a low-frequency brightness spectral index βsynch ≈ −2.7 that is similar to the broad synchrotron component indicating that they are both populated by the cosmic ray electrons of the same spectral index. The width of this narrow synchrotron component is significantly larger than that of the other three components, suggesting that it is generated in an assembly of older supernova remnants that have expanded to sizes of order 150 pc in 3 × 105 yr; pulsars of a similar age have a similar spread in latitude. The thermal dust is identified in the SEDs with average parameters of Tdust = 20.4 ± 0.4 K, βFIR = 1.94 ± 0.03 (> 353 GHz), and βmm = 1.67 ± 0.02 (< 353 GHz). The latitude distributions of gamma-rays, CO, and the emission in high-frequency Planck bands have similar widths, showing that they are all indicators of the total gaseous matter on the plane in the inner Galaxy.The development of Planck has been supported by: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MICINN, JA and RES (Spain); Tekes, AoF and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); and PRACE (EU). The research leading to these results has received funding from an STFC Consolidated Grant (No. ST/L000768/1), as well as the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement Nos. 267934
and 307209.Peer Reviewe
The CALIFA survey across the Hubble sequence: Spatially resolved stellar population properties in galaxies
© ESO, 2015. Various different physical processes contribute to the star formation and stellar mass assembly histories of galaxies. One important approach to understanding the significance of these different processes on galaxy evolution is the study of the stellar population content of today's galaxies in a spatially resolved manner. The aim of this paper is to characterize in detail the radial structure of stellar population properties of galaxies in the nearby universe, based on a uniquely large galaxy sample, considering the quality and coverage of the data. The sample under study was drawn from the CALIFA survey and contains 300 galaxies observed with integral field spectroscopy. These cover a wide range of Hubble types, from spheroids to spiral galaxies, while stellar masses range from MBlack star ∼ 109 to 7 × 1011 M⊙. We apply the fossil record method based on spectral synthesis techniques to recover the following physical properties for each spatial resolution element in our target galaxies: the stellar mass surface density (μBlack star), stellar extinction (AV), light-weighted and mass-weighted ages ('log age'L, 'log age'M), and mass-weighted metallicity ('log ZBlack star'M). To study mean trends with overall galaxy properties, the individual radial profiles are stacked in seven bins of galaxy morphology (E, S0, Sa, Sb, Sbc, Sc, and Sd). We confirm that more massive galaxies are more compact, older, more metal rich, and less reddened by dust. Additionally, we find that these trends are preserved spatially with the radial distance to the nucleus. Deviations from these relations appear correlated with Hubble type: earlier types are more compact, older, and more metal rich for a given MBlack star, which is evidence that quenching is related to morphology, but not driven by mass. Negative gradients of 'log age'L are consistent with an inside-out growth of galaxies, with the largest 'log age'L gradients in Sb-Sbc galaxies. Further, the mean stellar ages of disks and bulges are correlated and with disks covering a wider range of ages, and late-type spirals hosting younger disks. However, age gradients are only mildly negative or flat beyond R ∼ 2 HLR (half light radius), indicating that star formation is more uniformly distributed or that stellar migration is important at these distances. The gradients in stellar mass surface density depend mostly on stellar mass, in the sense that more massive galaxies are more centrally concentrated. Whatever sets the concentration indices of galaxies obviously depends less on quenching/morphology than on the depth of the potential well. There is a secondary correlation in the sense that at the same MBlack star early-type galaxies have steeper gradients. The μBlack star gradients outside 1 HLR show no dependence on Hubble type. We find mildly negative 'log ZBlack star'M gradients, which are shallower than predicted from models of galaxy evolution in isolation. In general, metallicity gradients depend on stellar mass, and less on morphology, hinting that metallicity is affected by both - the depth of the potential well and morphology/quenching.Support from the Spanish Ministerio de Economia y Competitividad, through projects AYA2010-15081 (PI R.G.D.), and Junta de Andalucia FQ1580 (PI R.G.D.), AYA2010-22111-C03-03, and AYA2010-10904E (S.F.S.). We also thank the Viabilidad, Diseno, Acceso y Mejora funding program, ICTS-2009-10, for funding the data acquisition of this project. R.C.F. thanks the hospitality of the IAA and the support of CAPES and CNPq. R.G.D. acknowledges the support of CNPq (Brazil) through Programa Ciencia sem Fronteiras (401452/2012-3). A.G. acknowledges support from EU FP7/2007-2013 under grant agreement n.267251 (AstroFIt) and from the EU Marie Curie Integration Grant >SteMaGE> Nr. PCIG12-GA-2012-326466. C.J.W. acknowledges support through the Marie Curie Career Integration Grant 303912. E.P. acknowledges support from the Guillermo Haro program at INAOE. Support for L.G. is provided by the Ministry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. L.G. acknowledges support by CONICYT through FONDECYT grant 3140566. J.I.P. acknowledges financial support from the Spanish MINECO under grant AYA2010-21887-C04-01 and from Junta de Andalucia Excellence Project PEX2011-FQM7058. I.M., J.M. and A.d.O. acknowledge support from the project AYA2013-42227-P. RAM is funded by the Spanish program of International Campus of Excellence Moncloa (CEI). J.M. A. acknowledges support from the European Research Council Starting Grant (SEDmorph; P.I. V. Wild).Peer Reviewe
Seeds of Life in Space (SOLIS) VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
Context: Low-mass protostars drive powerful molecular outflows that can be observed with millimetre and submillimetre telescopes.
Various sulfuretted species are known to be bright in shocks and could be used to infer the physical and chemical conditions throughout
the observed outflows.
Aims: The evolution of sulfur chemistry is studied along the outflows driven by the NGC 1333-IRAS4A protobinary system located
in the Perseus cloud to constrain the physical and chemical processes at work in shocks.
Methods: We observed various transitions from OCS, CS, SO, and SO2 towards NGC 1333-IRAS4A in the 1.3, 2, and 3 mm bands
using the IRAM NOrthern Extended Millimeter Array and we interpreted the observations through the use of the Paris-Durham shock
model.
Results: The targeted species clearly show different spatial emission along the two outflows driven by IRAS4A. OCS is brighter
on small and large scales along the south outflow driven by IRAS4A1, whereas SO2 is detected rather along the outflow driven by
IRAS4A2 that is extended along the north east–south west direction. SO is detected at extremely high radial velocity up to +25 km s−1
relative to the source velocity, clearly allowing us to distinguish the two outflows on small scales. Column density ratio maps estimated
from a rotational diagram analysis allowed us to confirm a clear gradient of the OCS/SO2 column density ratio between the IRAS4A1
and IRAS4A2 outflows. Analysis assuming non Local Thermodynamic Equilibrium of four SO2 transitions towards several SiO emission peaks suggests that the observed gas should be associated with densities higher than 105
cm−3
and relatively warm (T > 100 K)
temperatures in most cases.
Conclusions: The observed chemical differentiation between the two outflows of the IRAS4A system could be explained by a different chemical history. The outflow driven by IRAS4A1 is likely younger and more enriched in species initially formed in interstellar
ices, such as OCS, and recently sputtered into the shock gas. In contrast, the longer and likely older outflow triggered by IRAS4A2 is
more enriched in species that have a gas phase origin, such as SO2
The Mice at play in the CALIFA survey: A case study of a gas-rich major merger between first passage and coalescence
We present optical integral field spectroscopy (IFS) observations of the
Mice, a major merger between two massive (>10^11Msol) gas-rich spirals NGC4676A
and B, observed between first passage and final coalescence. The spectra
provide stellar and gas kinematics, ionised gas properties and stellar
population diagnostics, over the full optical extent of both galaxies. The Mice
provide a perfect case study highlighting the importance of IFS data for
improving our understanding of local galaxies. The impact of first passage on
the kinematics of the stars and gas has been significant, with strong bars
likely induced in both galaxies. The barred spiral NGC4676B exhibits a strong
twist in both its stellar and ionised gas disk. On the other hand, the impact
of the merger on the stellar populations has been minimal thus far: star
formation induced by the recent close passage has not contributed significantly
to the global star formation rate or stellar mass of the galaxies. Both
galaxies show bicones of high ionisation gas extending along their minor axes.
In NGC4676A the high gas velocity dispersion and Seyfert-like line ratios at
large scaleheight indicate a powerful outflow. Fast shocks extend to ~6.6kpc
above the disk plane. The measured ram pressure and mass outflow rate
(~8-20Msol/yr) are similar to superwinds from local ULIRGs, although NGC4676A
has only a moderate infrared luminosity of 3x10^10Lsol. Energy beyond that
provided by the mechanical energy of the starburst appears to be required to
drive the outflow. We compare the observations to mock kinematic and stellar
population maps from a merger simulation. The models show little enhancement in
star formation during and following first passage, in agreement with the
observations. We highlight areas where IFS data could help further constrain
the models.Comment: 23 pages, 13 figures, accepted to A&A. A version with a complete set
of high resolution figures is available here:
http://www-star.st-and.ac.uk/~vw8/resources/mice_v8_astroph.pd
Interactive translation prediction versus conventional post-editing in practice: a study with the CasMaCat workbench
[EN] We conducted a field trial in computer-assisted professional translation to
compare interactive translation prediction (ITP) against conventional post-editing (PE)
of machine translation (MT) output. In contrast to the conventional PE set-up, where
an MT system first produces a static translation hypothesis that is then edited by a
professional (hence "post-editing"), ITP constantly updates the translation hypothesis
in real time in response to user edits. Our study involved nine professional translators
and four reviewers working with the web-based CasMaCat workbench. Various new
interactive features aiming to assist the post-editor/translator were also tested in this
trial. Our results show that even with little training, ITP can be as productive as
conventional PE in terms of the total time required to produce the final translation.
Moreover, translation editors working with ITP require fewer key strokes to arrive at
the final version of their translation.This work was supported by the European Union’s 7th Framework Programme (FP7/2007–2013) under grant agreement No 287576 (CasMaCat ).Sanchis Trilles, G.; Alabau, V.; Buck, C.; Carl, M.; Casacuberta Nolla, F.; Garcia Martinez, MM.; Germann, U.... (2014). Interactive translation prediction versus conventional post-editing in practice: a study with the CasMaCat workbench. Machine Translation. 28(3-4):217-235. https://doi.org/10.1007/s10590-014-9157-9S217235283-4Alabau V, Leiva LA, Ortiz-Martínez D, Casacuberta F (2012) User evaluation of interactive machine translation systems. In: Proceedings of the 16th Annual Conference of the European Association for Machine Translation, pp 20–23Alabau V, Buck C, Carl M, Casacuberta F, García-Martínez M, Germann U, González-Rubio J, Hill R, Koehn P, Leiva L, Mesa-Lao B, Ortiz-Martínez D, Saint-Amand H, Sanchis-Trilles G, Tsoukala C (2014) Casmacat: A computer-assisted translation workbench. 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