897 research outputs found
How to Find Suitable Ontologies Using an Ontology-based WWW Broker
Knowledge reuse by means of outologies now faces three important problems: (1) there are no standardized identifying features that characterize ontologies from the user point of view; (2) there are no web sites using the same logical organization, presenting relevant information about ontologies; and (3) the search for appropriate ontologies is hard, time-consuming and usually fruitless. To solve the above problems, we present: (1) a living set of features that allow us to characterize ontologies from the user point of view and have the same logical organization; (2) a living domain ontology about ontologies (called ReferenceOntology) that gathers, describes and has links to existing ontologies; and (3) (ONTO)2Agent, the ontology-based www broker about ontologies that uses the Reference Ontology as a source of its knowledge and retrieves descriptions of ontologies that satisfy a given set of constraints. (ONTO)~Agent is available at http://delicias.dia.fi.upm.es/REFERENCE ONTOLOGY
Effectiveness of a program of romana’s Pilates for non-specific low back pain: A pilot study
Objetivo: comprobar la efectividad del método Pilates Romana para conseguir
una mayor flexibilidad de la columna, junto con una mejora en la movilidad de la
misma, así como del dolor que presentan en su vida diaria los pacientes.
Metodología: ensayo clínico con intención de tratar a treinta pacientes con dolor
lumbar inespecífico. Asistieron a 15 sesiones, 2 veces a la semana, del Método
Pilates Romana.. Se evaluaron parámetros tales como dolor, test de Schöber,
SRS-22 y distancia dedos- suelo.
Resultados. Se encontraron diferencias estadísticamente significativas con
respecto al dolor (escala EVA), distancia dedos- suelo, test de Schöber
(flexibilidad en plano sagital), flexión lateral (flexibilidad en plano frontal) y en
varios ítems de la escala SRS-22, con valores de p<0,001. Por ello, este método
puede ser usado para mejorar el dolor, la flexibilidad axial, la función y los
aspectos relacionados con la calidad de vidaAim: to test the effectiveness of the Romana’s Pilates method to obtain
increased flexibility, improvements in mobility, and reduced pain in daily life.
Methodology: a clinical trial with intention-to-treat thirty patients with nonspecific
low back pain. Participants attended 15 sessions, twice a week. The
Romana’s Pilates method was taught by an external physiotherapist.
Parameters such as pain, the Schober test, and the SRS-22 were evaluated.
Results: Statistically significant differences in pain (VAS), the Schober test
(flexibility in sagittal plane), lateral flexion (flexibility in frontal plane) and several
items of the SRS-22 scale were found, with p <0.001.
This method may be used to improve pain, axial flexibility, function and aspects
related to the quality of life of patient
(ONTO)2 Agent: an Ontology-based WWW broker to select ontologies
Knowledge reuse by means of ontologies now faces three
important problems: (1) there are no standardized identifying features that characterize ontologies from the user point of view; (2) there are no web sites using the same logical organization, presenting relevant information about ontologies; and (3) the search for appropriate ontologies is hard, timeconsuming and usually fruitless. To solve the above problems, we present: (1) a living set of features that allow us to characterize ontologies from the user point of view and have the same logical organization; (2) a living domain ontology about ontologies (called Reference Ontology) that gathers, describes and has links to existing ontologies; and (3) (ONTO)2Agent, the ontology-based www broker about ontologies that uses the Reference Ontology as a source of its knowledge and retrieves descriptions of ontologies that satisfy a given set of constraints. (ONTO)2Agent is available at http://delicias.dia.fi.upm.es/REFERENCE_ONTOLOGY
Crystallisation of amorphous Al-Y-Ni-(Cu)alloys
The nanocrystallisation behaviour and subsequent intermetallics formation
of an amorphous Al88-Y4-Ni8 alloy has been studied. A 1 at% of Al or Ni
was also substituted by Cu and its effect studied. Differential scanning
calorimetry has been used to measure the thermal stability of these
amorphous alloys. Transmission electron microscopy showed the smaller
size of the nanocrystals obtained during primary crystallisation when Cu is
added. Using three-dimensional atom probe, it has been checked that Cu is
homogeneously distributed in the amorphous matrix, not contributing to a
heterogeneous nucleation around Cu clusters during the formation of
nanocrystals. Transmission electron microscopy and X-rays diffraction are
used to study the controversial intermetallics occurrence at higher
temperatures. The sequence and characteristics of the intermetallics
appearing in these alloys were sensitive to the presence of Cu. The evolution
of these intermetallics, up to 600 ºC, has been studied. Findings are
compared with previous studies.Ministerio de Economía y Competitividad DPI2015-69550-C2-2-
Stability of nanoscale secondary phases in an oxide dispersion strengthened Fe-12Cr alloy
Transmission electron microscopy and atom-probe tomography were used to characterize on a near-atomic scale the microstructure and oxide and carbide phases that form during thermo-mechanical treatments of a model oxide dispersion strengthened Fe-12 wt.% Cr-0.4 wt.% Y₂O₃ alloy. It was found that some of the Y-rich nanoparticles retained their initial crystallographic structure but developed a Cr-enriched shell, while others evolved into ternary oxide phases during the initial processing. The Y- and Cr-rich oxide phases formed remained stable after annealing at 1023 K for 96 h. However, the number of Cr-rich carbides appeared to increase, inducing Cr depletion in the matrix.the FP6 Euratom
Research and Training Programme on Nuclear Energy
(VdC), The Engineering and Physical Sciences
Research Council (SLP) and The Royal Society (EAM).
The Comunidad de Madrid, through the ESTRUMATCM
(MAT-77) programme, and the use of the Chemical
Database Service at DaresburyPublicad
Analytical characterization of secondary phases and void distributions in an ultrafine-grained ODS Fe─14Cr model alloy
Proceedings of the: The 14th International Conference on Fusion Reactor Materials (ICFRM-14) was held at the Sapporo Convention Center in Sapporo, Japan from 7 to 12 September 2009.Two model Fe─14Cr alloys, one containing 0.3 wt.% of Y₂O₃ particles, were fabricated by mechanical alloying of Fe and Cr elemental powders under a He atmosphere. They were subsequently consolidated and thermomechanically treated to produce ultra-fine grained materials. Cr-carbides and oxides were found in both alloys. The oxide dispersion-strengthened (ODS) alloy also contained a fine dispersion of nanoparticles, some of them having a Y─O rich core and a Cr-rich shell. Nanometric sized voids were found in both materials, often attached to secondary phases, dislocations and grain boundaries. Their sizes were significantly smaller in the ODS alloy.This research has been supported by the Fusion Energy Materials Science (FEMaS) FP7 coordination action and the IP3 FP6 ESTEEM project under Contract No. 026019. The financial support from European Fusion Development Agreement (Contract No. 09-240), the Ministerio de Innovacion y Ciencia (Project No. ENE 2008-06403-C06-04 and Juan de la Cierva programme) and the Comunidad de Madrid, through the program ESTRUMAT-CM, Grant S-0505/MAT/0077Publicad
Imine-palladacycles as phosphine-free precatalysts for low temperature Suzuki-Miyaura synthesis of nucleoside analogues in aqueous media
The synthesis and characterization of new water-soluble dinuclear palladacycles of the general formula [{Pd(R-C^N-SO3Na)(μ-AcO)}2] (R = H (1), OMe (2), Cl (3)) incorporating an ortho-metalated sodium 4-(N-benzylideneamino)benzenesulfonate moiety is reported. These complexes have been revealed to be excellent phosphine-free catalysts for the synthesis of functionalized nucleoside analogues involving a low-temperature Suzuki–Miyaura coupling of 5-iodo-2′-deoxyuridine with different arylboronic acids in neat water. The potential of 1–3 as synthetic precursors was also tested, and bridging acetates were cleaved by reaction with neutral PPh3, yielding the corresponding mononuclear derivatives [Pd(R-C^N-SO3Na)(AcO)(PPh3)] (R = H (4), MeO (5), Cl (6)). Analytical and spectroscopic techniques confirmed the proposed formulas and reactivities reported for complexes 1–6. Structural characterization by X-ray diffraction of single crystals grown from samples of 4 and 6 produced the unexpected but valuable crystallization-mediated compounds 4cm and 6cm that also supported the results presented here.This work has been partially supported by RTI2018-098233-B-C21 (MICINN) and
20790/PI/18 (Fundación SENECA CARM) grants. A.R.K would like to acknowledge
SERB for EMR grant (EMR/2016/005439). Professor Gregorio Sánchez, who recently
passed away, is gratefully acknowledged for his contribution to this work and his wise
and continuous advise and suppor
Role of starting phase of boron on the mechanical alloying of FeNbB composition
Mechanical alloyed Fe75Nb10B15 systems, prepared with crystalline or commercial
amorphous boron and a similar composition with the same Fe/Nb ratio but no boron,
have been studied as a function of milling time in the aim of enhancing the
homogenization of boron and determining its role on the mechanical alloying process.
Neither boron addition nor boron phase used affect the developed microstructure at very
early stages. After 4 h milling at 350 rpm, the formation of an amorphous phase was
observed for boron containing compositions while for the boron-free alloy a
supersaturated solid solution was found in the final microstructure. The alloy prepared
using commercial amorphous boron showed a larger fraction of amorphous phase than
that prepared using crystalline boron for the same milling time, suggesting that
amorphous boron accelerates the formation of the amorphous phase during mechanical
alloyin
Analytical characterisation of oxide dispersion strengthened steels for fusion reactors
Special issue articleReduced activation ferritic/martensitic and ferritic steels strengthened by a dispersion of oxide nanoparticles have been considered viable structural materials for fusion applications above 550°C. However, the microstructural stability and mechanical behaviour of these steels subjected
to the aggressive operating conditions of these reactors are not well known. An accelerated development of these materials is crucial if they are going to be used in future power reactors.
Then, it is indispensable to understand their atomic scale evolution under high temperature and irradiation conditions. The present paper reviews how the combination of transmission electron microscopy and atom probe tomography has been successfully applied for the characterisation of these steels at the near atomic scale, to reveal the nanoparticle structure, grain boundary
chemistry and void distribution.The present research has been supported by the FP6
Euratom Research and Training Programme on Nuclear
Energy, the Fusion Energy Materials Science (FEMaS)
FP7 coordination action, the IP3 FP6 ESTEEM project
under contract no. 026019 and the Consejería de
Educación de la Comunidad de Madrid, through the
program ESTRUMAT-CM S2009MAT-1585. EAM
thanks the Royal Society for the financial support (RS
Dorothy Hodgkin fellowship)
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