371 research outputs found
Effects of isothermal oxidation on the local wear behaviour of laser cladded Inconel 625 coatings
Ni-based alloys, such as Inconel superalloys, are characterized by high strength,
excellent fabricability (including joining), and outstanding corrosion resistance.
However, their use is limited by their high cost. Ni-based coatings are used on
carbon steel components in order to increase their service life under extreme
conditions. Laser cladding deposition has emerged as an excellent method for
processing Ni-based coatings. In this work, the evolution of the local wear behaviour
of Inconel 625 laser cladded coatings after high temperature isothermal oxidation
treatments have been investigated.The authors would like to thank the Spanish government CICYT through grants
MAT2010-18916 and MAT2013-41784-R, the Universidad Rey Juan Carlos project
URJC-CM-2010-CET-5550 and the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement number 605207 for financial
support
Implementing the Five-A Model of technical refinement: Key roles of the sport psychologist
There is increasing evidence for the significant contribution provided by sport psychologists within applied coaching environments. However, this rarely considers their skills/knowledge being applied when refining athletesâ already learned and well-established motor skills. Therefore, this paper focuses on how a sport psychologist might assist a coach and athlete to implement long-term permanent and pressure proof refinements. It highlights key contributions at each stage of the Five-A Modelâdesigned to deliver these important outcomesâproviding both psychomotor and psychosocial input to the support delivery. By employing these recommendations, sport psychologists can make multiple positive contributions to completion of this challenging task
A Reciprocal CellâCell Interaction Mediated by NT-3 and Neuregulins Controls the Early Survival and Development of Sympathetic Neuroblasts
Neurotrophin 3 (NT-3) can support the survival of some embryonic sympathetic neuroblasts before they become nerve growth factor dependent. We show that NT-3 is produced in vivo by nonneuronal cells neighboring embryonic sympathetic ganglia. NT-3 mRNA is produced by these nonneuronal cells in vitro and is up-regulated by platelet-derived growth factor, ciliary neurotrophic factor, and glial growth factor 2 (a neuregulin). Nonneuronal cellâconditioned medium promotes survival and induces TrkA expression in isolated sympathetic neuroblasts, and this activity is blocked by anti-NT-3 antibody. Neuroblasts also enhance NT-3 production by nonneuronal cells. Neuroblasts synthesize several forms of neuregulin, and antibodies to neuregulin attenuate the effect of the neuroblasts on the nonneuronal cells. These data suggest a reciprocal cellâcell interaction, in which neuroblast-derived neuregulins promote NT-3 production by neighboring nonneuronal cells, which in turn promotes neuroblast survival and further differentiation
Cosmic Swarms: A search for Supermassive Black Holes in the LISA data stream with a Hybrid Evolutionary Algorithm
We describe a hybrid evolutionary algorithm that can simultaneously search
for multiple supermassive black hole binary (SMBHB) inspirals in LISA data. The
algorithm mixes evolutionary computation, Metropolis-Hastings methods and
Nested Sampling. The inspiral of SMBHBs presents an interesting problem for
gravitational wave data analysis since, due to the LISA response function, the
sources have a bi-modal sky solution. We show here that it is possible not only
to detect multiple SMBHBs in the data stream, but also to investigate
simultaneously all the various modes of the global solution. In all cases, the
algorithm returns parameter determinations within (as estimated from
the Fisher Matrix) of the true answer, for both the actual and antipodal sky
solutions.Comment: submitted to Classical & Quantum Gravity. 19 pages, 4 figure
A Marketplace-based Approach to Cloud Network Slice Composition Across Multiple Domains
Cloud network slicing can be defined as the process that enables isolated end-to-end and on-demand networking abstractions, which: (a) contain both cloud and network resources, and (b) are independently controlled, managed and orchestrated. This paper contributes to the vision of the NECOS project and relevant platform, that aim to address the limitations of current cloud computing infrastructures to accomplish the challenging requirements of the slicing approach. The NECOS platform implements the Slice-as-a-Service model, enabling the dynamic creation of end-to-end (E2E) slices from a set of constituent slice parts contributed from multiple domains. A challenging issue is to define the facility that implements dynamic slice resource discovery, aligned to the requirements of the slice owner or tenant, over different infrastructure providers. Here, we propose a Marketplace-based approach implementing relevant federated interactions for the resource discovery and we detail its architecture, workflows, and information model. We also present its initial implementation details and provide both quantitative and qualitative experimental results validating its main operation
Designing Ultraflexible Perovskite X-Ray Detectors through Interface Engineering
X-ray detectors play a pivotal role in development and advancement of humankind, from far-reaching impact in medicine to furthering the ability to observe distant objects in outer space. While other electronics show the ability to adapt to flexible and lightweight formats, state-of-the-art X-ray detectors rely on materials requiring bulky and fragile configurations, severely limiting their applications. Lead halide perovskites is one of the most rapidly advancing novel materials with success in the field of semiconductor devices. Here, an ultraflexible, lightweight, and highly conformable passively operated thin film perovskite X-ray detector with a sensitivity as high as 9.3 ± 0.5 ”C Gyâ1 cmâ2 at 0 V and a remarkably low limit of detection of 0.58 ± 0.05 ÎŒGy sâ1 is presented. Various electron and hole transporting layers accessing their individual impact on the detector performance are evaluated. Moreover, it is shown that this ultrathin form-factor allows for fabrication of devices detecting X-rays equivalently from front and back side
Emissão de óxido nitroso em sistemas de manejo do solo e de rotação de culturas.
Editores tĂ©cnicos: Joseani Mesquita Antunes, Ana LĂdia Variani Bonato, MĂĄrcia Barrocas Moreira Pimentel
Floristic and forest inventory of Santa Catarina: species of evergreen rainforest.
O presente trabalho objetivou apresentar a lista de espĂ©cies da floresta pluvial subtropical (Floresta OmbrĂłfila Densa) em Santa Catarina, com base em 202 unidades amostrais implantadas pelo InventĂĄrio FlorĂstico Florestal de Santa Catarina para estudo do componente arbĂłreo-arbustivo e da regeneração, alĂ©m de coletas florĂsticas externas Ă s unidades amostrais. Foram registradas 1.473espĂ©cies, 19,0% das espĂ©cies citadas para esta tipologia florestal no Brasil, dentre estas trĂȘs gimnospermas e 1.470 angiospermas. As famĂlias mais ricas em espĂ©cies foram: Orchidaceae (143 espĂ©cies), Myrtaceae (142), Asteraceae (98), Melastomataceae (86), Fabaceae (78), Rubiaceae (65), Solanaceae (61), Bromeliaceae (57), Piperaceae (56) e Lauraceae (52). Entre as espĂ©cies registradas, oito constam na Lista Oficial das EspĂ©cies da Flora Brasileira Ameaçadas de Extinção: Aechmea blumenavii, Araucaria angustifolia, Billbergia alfonsijoannis, Euterpe edulis, Heliconia farinosa, Ocotea catharinensis, O. odorifera e O. porosa
Expression of trk in MAH Cells Lacking the p75 Low-Affinty Nerve Growth Factor Receptor is Sufficient to Permit Nerve Growth Factor-Induced Differentiation to Postmitotic Neurons
We have transfected MAH cells, an immortalized sympathoadrenal progenitor cell line, with a plasmid encoding the 140-kDa Trk protein, a nerve growth factor (NGF) receptor with protein-tyrosine kinase activity. NGF promotes neurite outgrowth and proliferation from such cells, indicating that Trk is sufficient to mediate such responses in the absence of significant levels of the endogenous 75-kDa low-affinity NGF receptor (p75). These initial NGF responses are indistinguishable from those evoked by basic fibroblast growth factor (bFGF). However, NGF is sufficient to promote terminal differentiation of a {approx}8% of trk-transfected MAH cells to postmitotic, NGF-dependent neurons, whereas all cells eventually die in medium with bFGF. Other environmental signals (such as depolarization or ciliary neurotrophic factor) can cooperate with NGF to enhance production of postmitotic NGF-dependent neurons in trk-transfected MAH cells. The terminal differentiation of sympathetic neurons thus involves sequential and cooperative actions of different growth and neurotrophic factors, as well as cell-intrinsic changes in the response to these factors
InventĂĄrio FlorĂstico Florestal de Santa Catarina: espĂ©cies da Floresta Estacional Decidual.
O presente trabalho visou apresentar e analisar a flora da Floresta Estacional Decidual em Santa Catarina, Brasil, tendo como fonte de dados os levantamentos realizados durante o InventĂĄrio FlorĂstico Florestal de Santa Catarina. Foram avaliadas as espĂ©cies de indivĂduos lenhosos de 79 unidades amostrais de 4.000 mÂČ. Foram feitas coletas extras de indivĂduos fĂ©rteis, no entorno e nas unidades amostrais, das demais formas de vida. Este esforço amostral registrou 420 espĂ©cies, abrangendo 90 famĂlias e 275 gĂȘneros. Nas unidades amostrais, registrou-se 233 espĂ©cies, sendo 204 com diĂąmetro na altura do peito (DAP) ? 10 cm e 162 com diĂąmetro na altura do peito DAP ? 10 cm e altura ? 1,50 m, portanto com espĂ©cies em comuns. A coleta de material extra registrou 332 angiospermas e uma gimnosperma (Araucaria angustifolia), demonstrando a importĂąncia de coletas externas Ă s ĂĄreas previamente delimitadas. Entre as ameaçadas de extinção foram registradas Ocotea odorifera e Araucaria angustifolia
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