280 research outputs found
The Length and Age Composition of Spot, Leiostomus xanthurus, in the Pound Net Fishery of Lower Chesapeake Bay
Introduction
De 2000 Ă 2015, le C2RMF a participĂ© activement Ă un rĂ©seau (LabS-TECH), puis Ă des projets de recherche europĂ©ens (Eu-ARTECH, CHARISMA) ouvrant aux professionnels du patrimoine culturel un accĂšs transnational Ă des infrastructures et Ă©quipements de recherche rĂ©partis en Europe. Ces actions avaient pour objectif central de fĂ©dĂ©rer, puis associer et faire coopĂ©rer des institutions de pays membres de lâUnion europĂ©enne aux statuts divers (universitĂ©s, institutions publiques patrimoniales, musĂ©e..
Heterotic type IIA duality with fluxes - towards the complete story
In this paper we study the heterotic type IIA duality when fluxes are turned
on. We show that many of the known fluxes are dual to each other and claim that
certain fluxes on the heterotic side require that the type IIA picture is
lifted to M or even F-theory compactifications with geometric fluxes.Comment: 31 pages, references adde
Subphenotypes in patients with acute respiratory distress syndrome treated with high-flow oxygen
Acute respiratory distress syndrome; Biomarkers; High-flow nasal oxygenSĂndrome de dificultat respiratĂČria aguda; Biomarcadors; Oxigen nasal d'alt fluxSĂndrome de dificultad respiratoria aguda; Biomarcadores; OxĂgeno nasal de alto flujoBackground
Acute respiratory distress syndrome (ARDS) subphenotypes differ in outcomes and treatment responses. Subphenotypes in high-flow nasal oxygen (HFNO)-treated ARDS patients have not been investigated.
Objectives
To identify biological subphenotypes in HFNO-treated ARDS patients.
Methods
Secondary analysis of a prospective multicenter observational study including ARDS patients supported with HFNO. Plasma inflammation markers (interleukin [IL]-6, IL-8, and IL-33 and soluble suppression of tumorigenicity-2 [sST2]) and lung epithelial (receptor for advanced glycation end products [RAGE] and surfactant protein D [SP-D]) and endothelial (angiopoietin-2 [Ang-2]) injury were measured. These biomarkers and bicarbonate were used in K-means cluster analysis to identify subphenotypes. Logistic regression was performed on biomarker combinations to predict clustering. We chose the model with the best AUROC and the lowest number of variables. This model was used to describe the HAIS (High-flow ARDS Inflammatory Subphenotype) score.
Results
Among 41 HFNO patients, two subphenotypes were identified. Hyperinflammatory subphenotype (nâ=â17) showed higher biomarker levels than hypoinflammatory (nâ=â24). Despite similar baseline characteristics, the hyperinflammatory subphenotype had higher 60-day mortality (47 vs 8.3% pâ=â0.014) and longer ICU length of stay (22.0 days [18.0â30.0] vs 39.5 [25.5â60.0], pâ=â0.034). The HAIS score, based on IL-8 and sST2, accurately distinguished subphenotypes (AUROC 0.96 [95%CI: 0.90â1.00]). A HAIS scoreââ„â7.45 was predictor of hyperinflammatory subphenotype.
Conclusion
ARDS patients treated with HFNO exhibit two biological subphenotypes that have similar clinical characteristics, but hyperinflammatory patients have worse outcomes. The HAIS score may identify patients with hyperinflammatory subphenotype and might be used for enrichment strategies in future clinical trials.The princeps study was supported, in part, by a grant from Instituto de Salud Carlos III-Fondo Europeo de Desarrollo Regional (FEDER) (PI14/01420) and a grant from FederaciĂłn Española del Enfermo CrĂtico (FEEC) 2015. No specific support was done for this re-analysis
A TĂO DIFĂCIL ARTE DE LER OU DO MUNDO COMO TEXTO
Neste artigo tecemos reflexĂ”es sobre a relação entre leitura de mundo e leitura literĂĄria, numa paisagem pĂłs-moderna, em que os valores, as narrativas e as organizaçÔes se descentralizam, desordenam-se e passam a responder Ă s intimaçÔes do jogo. Com referencial teĂłrico pautado em autores que discutem o pĂłs-moderno e metodologia ensaĂsta de tradição filosĂłfica, o objetivo Ă© apontar, de um lado, como a literatura transita, aparece e submerge na paisagem contemporĂąnea e, de outro, como a leitura, enquanto prĂĄtica compreensiva e interpretativa, realiza-se em outros espaços.PALAVRAS-CHAVE: leitura, contemporaneidade, literatura, filosofi
Mixed carbon nanomaterial/epoxy resin for electrically conductive adhesives
The increasing complexity of printed circuit boards (PCBs) due to miniaturization, increased the density of electronic components, and demanding thermal management during the assembly triggered the research of innovative solder pastes and electrically conductive adhesives (ECAs). Current commercial ECAs are typically based on epoxy matrices with a high load (>60%) of silver particles, generally in the form of microflakes. The present work reports the production of ECAs based on epoxy/carbon nanomaterials using carbon nanotubes (single and multi-walled) and exfoliated graphite, as well as hybrid compositions, within a range of concentrations. The composites were tested for morphology (dispersion of the conductive nanomaterials), electrical and thermal conductivity, rheological characteristics and deposition on a test PCB. Finally, the ECAâs shelf life was assessed by mixing all the components and conductive nanomaterials, and evaluating the cure of the resin before and after freezing for a time range up to nine months. The ECAs produced could be stored at â18 °C without affecting the cure reaction.This research was funded by the Portugal Incentive System for Research and Technological Development,Project in Co-Promotion nâŠ039479/2019 (Factory of the Future: Smart Manufacturing 2019â202
Type II compactifications on manifolds with SU(2) x SU(2) structure
We study compactifications of type II theories on SU(2) x SU(2) structure
manifolds to six, five and four spacetime dimensions. We use the framework of
generalized geometry to describe the NS-NS sector of such compactifications and
derive the structure of their moduli spaces. We show that in contrast to SU(3)
x SU(3) structure compactifications, there is no dynamical SU(2) x SU(2)
structure interpolating between an SU(2) structure and an identity structure.
Furthermore, we formulate type II compactifications on SU(2) x SU(2) structures
in the context of exceptional generalized geometry which makes the U-duality
group manifest and naturally incorporates the scalar degrees of freedom arising
in the Ramond-Ramond sector. Via this formalism we derive the structure of the
moduli spaces as it is expected from N=4 supergravity.Comment: 69 pages, v2 published versio
Generalized Geometry and Partial Supersymmetry Breaking
This review article consists of two parts. In the first part we use the
formalism of (exceptional) generalized geometry to derive the scalar field
space of SU(2)xSU(2)-structure compactifications. We show that in contrast to
SU(3)xSU(3) structures, there is no dynamical SU(2)xSU(2) structure
interpolating between an SU(2) structure and an identity structure.
Furthermore, we derive the scalar manifold of the low-energy effective action
for consistent Kaluza-Klein truncations as expected from N=4 supergravity.
In the second part we then determine the general conditions for the existence
of stable Minkowski and AdS N=1 vacua in spontaneously broken gauged N=2
supergravities and construct the general solution under the assumption that two
appropriate commuting isometries exist in the hypermultiplet sector.
Furthermore, we derive the low-energy effective action below the scale of
partial supersymmetry breaking and show that it satisfies the constraints of
N=1 supergravity. We then apply the discussion to special quaternionic-Kahler
geometries which appear in the low-energy limit of SU(3)xSU(3)-structure
compactifications and construct Killing vectors with the right properties.
Finally we discuss the string theory realizations for these solutions.Comment: 117 pages, Ph.D. thesis (Advisor: Jan Louis); v2: references adde
Nanofluid Based on GlucoseâDerived Carbon Dots Functionalized with [Bmim]Cl for the Next Generation of Smart Windows
The design of new advanced materials and technologies is essential for the development of smart windows for the next generation of energyâefficient buildings. Here, it is demonstrated that the functionalization of glucoseâderived carbon dots with 1âbutylâ3âmethylimidazolium chloride results in a selfâstanding, waterâsoluble, viscous, reusable nanofluid with selfâimproving conductivity, thermotropy around 30â40 °C, and ultraviolet blocking ability. Its synthesis is straightforward, clean, fast, and cheap. At 36 °C (hot summer day), a sunâactuated thermotropic (TT) device incorporating a 95% w/w nanofluid aqueous solution exhibits a transmittance variation (ÎT ) of 9% at 550/1000 nm, which is amplified to 47/31% via the surface plasmon resonance effect. An integrated selfâhealing system enabling independent sunâactuated TT and voltageâactuated electrochromic (EC) operation is also produced. The lowâenergy EC device offers bright hot and dark cold modes (ÎT = 68/64%), excellent cycling stability, unprecedented coloration efficiency values (â1.73 Ă 106/â1.67 Ă 106 cm2 Câ1 (coloring) and +1.12 Ă 107/+1.08 Ă 107 cm2 Câ1 (bleaching) at ±2.5 V), and impressive memory effect. The disruptive design and sustainable synthesis of the new nanofluid proposed here will foster the agile development of novel products with improved ecological footprint.This research was funded by the National Funds by Foundation for Science and Technology (FCT) and by the FEDER funds through POCI-COMPETE 2020-Operational Programme Competitiveness and Internationalization in Axis I: Strengthening research, technological development and innovation (UID/QUI/00616/2013, UID/QUI/50006/2019, UID/Multi/00709/2013, UID/QUI/00313/2019, UID/CTM/50025, POCI-01-0145-FEDER-007491, POCI-01-0145-FEDER-007688, UID/CTM/50025, POCI-01-0145-FEDER-016884, PTDC/CTM-NAN/0956/2014, SAICT/PAC/0032/2015, POCI-01-0145-FEDER-016422, and NORTE-01-0145-FEDER-030858). R.F.P.P. acknowledges FCT-MCTES for SFRH/BPD/87759/2012 grant. R. Rego and M. Fernandes (UTAD, Vila Real) and E. Pereira (FCUP, Porto) are acknowledged for their assistance.info:eu-repo/semantics/publishedVersio
A new 3D positioner for the analytical mapping of non-flat objects under accelerator beams
We report the development of a 3D positioner for the elemental mapping of non-flat surfaces of heritage targets and its implementation in the external beam of the AGLAE accelerator, a joint research activity of the IPERION-CH European program.The positioner operates in two steps: 1) object surface is digitized using a 3D scanner implemented in the beamline. Surface points are interpolated onto a rectangular grid suitable for beam scanning. 2) Object is scanned under the beam using X/Y/Z stages holding a hexapod robot for rotations. During scanning, target surface is positioned with the Z stage and oriented perpendicular to the beam using hexapod rotations. Areas up to 100 à 100 mm 2 with a resolution of 50 ” m and 30° curvature of can be mapped on objects of 200 mm and 5 kg max. System operation was tested by recording PIXE maps on the polychrome decoration of a curved porcelain pot
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