2,163 research outputs found

    Web based system architecture for long pulse remote experimentation

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    Remote experimentation (RE) methods will be essential in next generation fusion devices. Requirements for long pulse RE will be: on-line data visualization, on-line data acquisition processes monitoring and on-line data acquisition systems interactions (start, stop or set-up modifications). Note that these methods are not oriented to real-time control of fusion plant devices. INDRA Sistemas S.A., CIEMAT (Centro de Investigaciones Energéticas Medioambientales y Tecnológicas) and UPM (Universidad Politécnica de Madrid) have designed a specific software architecture for these purposes. The architecture can be supported on the BeansNet platform, whose integration with an application server provides an adequate solution to the requirements. BeansNet is a JINI based framework developed by INDRA, which makes easy the implementation of a remote experimentation model based on a Service Oriented Architecture. The new software architecture has been designed on the basis of the experience acquired in the development of an upgrade of the TJ-II remote experimentation system

    Boundary K-matrices for the XYZ, XXZ AND XXX spin chains

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    The general solutions for the factorization equations of the reflection matrices K±(Ξ)K^{\pm}(\theta) for the eight vertex and six vertex models (XYZ, XXZ and XXX chains) are found. The associated integrable magnetic Hamiltonians are explicitly derived, finding families dependig on several continuous as well as discrete parameters.Comment: 13 page

    Calibration of semi-analytic models of galaxy formation using Particle Swarm Optimization

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    We present a fast and accurate method to select an optimal set of parameters in semi-analytic models of galaxy formation and evolution (SAMs). Our approach compares the results of a model against a set of observables applying a stochastic technique called Particle Swarm Optimization (PSO), a self-learning algorithm for localizing regions of maximum likelihood in multidimensional spaces that outperforms traditional sampling methods in terms of computational cost. We apply the PSO technique to the SAG semi-analytic model combined with merger trees extracted from a standard Λ\LambdaCDM N-body simulation. The calibration is performed using a combination of observed galaxy properties as constraints, including the local stellar mass function and the black hole to bulge mass relation. We test the ability of the PSO algorithm to find the best set of free parameters of the model by comparing the results with those obtained using a MCMC exploration. Both methods find the same maximum likelihood region, however the PSO method requires one order of magnitude less evaluations. This new approach allows a fast estimation of the best-fitting parameter set in multidimensional spaces, providing a practical tool to test the consequences of including other astrophysical processes in SAMs.Comment: 11 pages, 4 figures, 1 table. Accepted for publication in ApJ. Comments are welcom

    Throughflow Velocity Crossing the Dome of Erupting Bubbles in 2-D Fluidized Beds

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    A new non-intrusive method for measuring the throughflow velocity crossing the dome of erupting bubbles in freely bubbling 2-D fluidized beds is presented. Using a high speed video-camera, the dome acceleration, drag force and throughflow velocity profiles are obtained for different experiments, varying the superficial gas velocity. The acceleration profiles show greater values in the dome zone where the gravity component is negligible. The drag force and the throughflow velocity profiles show a uniform value in the central region of the dome (40 deg \u3c \u3c 140 deg) and the total throughflow increases with the superficial gas velocity

    Hydrodynamic Characteristics of a Fluidized Bed with Rotating Distributor

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    The performance of a novel rotating distributor fluidized bed is presented. The pressure drop and the standard deviation of pressure fluctuations, σp, were used to find the minimum fluidization velocity, Umf, and to characterize the quality of fluidization at different rotational speeds of the distributor plate. Experiments were conducted in the freely bubbling regime in a 0.19 m i.d. fluidized bed, operating with Group B particles according to Geldart’s classification. A decrease in Umf is observed when the rotational speed increases. Frequency analysis of pressure fluctuations shows that fluidization can be controlled by the adjustable rotational speed, at several excess gas velocities

    Generation of a Soluble Form of Human Endoglin Fused to Green Fluorescent Protein.

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    Endoglin (Eng, CD105) is a type I membrane glycoprotein that functions in endothelial cells as an auxiliary receptor for transforming growth factor ÎČ (TGF-ÎČ)/bone morphogenetic protein (BMP) family members and as an integrin ligand, modulating the vascular pathophysiology. Besides the membrane-bound endoglin, there is a soluble form of endoglin (sEng) that can be generated by the action of the matrix metalloproteinase (MMP)-14 or -12 on the juxtamembrane region of its ectodomain. High levels of sEng have been reported in patients with preeclampsia, hypercholesterolemia, atherosclerosis and cancer. In addition, sEng is a marker of cardiovascular damage in patients with hypertension and diabetes, plays a pathogenic role in preeclampsia, and inhibits angiogenesis and tumor proliferation, migration, and invasion in cancer. However, the mechanisms of action of sEng have not yet been elucidated, and new tools and experimental approaches are necessary to advance in this field. To this end, we aimed to obtain a fluorescent form of sEng as a new tool for biological imaging. Thus, we cloned the extracellular domain of endoglin in the pEGFP-N1 plasmid to generate a fusion protein with green fluorescent protein (GFP), giving rise to pEGFP-N1/Eng.EC. The recombinant fusion protein was characterized by transient and stable transfections in CHO-K1 cells using fluorescence microscopy, SDS-PAGE, immunodetection, and ELISA techniques. Upon transfection with pEGFP-N1/Eng.EC, fluorescence was readily detected in cells, indicating that the GFP contained in the recombinant protein was properly folded into the cytosol. Furthermore, as evidenced by Western blot analysis, the secreted fusion protein yielded the expected molecular mass and displayed a specific fluorescent signal. The fusion protein was also able to bind to BMP9 and BMP10 in vitro. Therefore, the construct described here could be used as a tool for functional in vitro studies of the extracellular domain of endoglin

    VINEDA—Volcanic INfrasound Explosions Detector Algorithm

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    Infrasound is an increasingly popular tool for volcano monitoring, providing insights of the unrest by detecting and characterizing acoustic waves produced by volcanic processes, such as explosions, degassing, rockfalls, and lahars. Efficient event detection from large infrasound databases gathered in volcanic settings relies on the availability of robust and automated workflows. While numerous triggering algorithms for event detection have been proposed in the past, they mostly focus on applications to seismological data. Analyses of acoustic infrasound for signal detection is often performed manually or by application of the traditional short-term average/long-term average (STA/LTA) algorithms, which have shown limitations when applied in volcanic environments, or more generally to signals with poor signal-to-noise ratios. Here, we present a new algorithm specifically designed for automated detection of volcanic explosions from acoustic infrasound data streams. The algorithm is based on the characterization of the shape of the explosion signals, their duration, and frequency content. The algorithm combines noise reduction techniques with automatic feature extraction in order to allow confident detection of signals affected by non-stationary noise.We have benchmarked the performances of the new detector by comparison with both the STA/LTA algorithm and human analysts, with encouraging results. In this manuscript, we present our algorithm and make its software implementation available to other potential users. This algorithm has potential to either be implemented in near real-timemonitoring workflows or to catalog pre-existing databases.This research was partially funded by KNOWAVES TEC2015- 68752 (MINECO/FEDER), by NERC Grant NE/P00105X/1, by Spanish research grant MECD Jose Castillejo CAS17/00154 and by VOLCANOWAVES European Union’s Horizon 2020 Research and Innovation Programme Under the Marie Sklodowska-Curie Grant Agreement no 798480

    Re-routing of cooling water pipeline

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    This thesis was made for WĂ€rtsilĂ€ Finland Oy department of Power Plants. The purpose of this thesis was to compare different solutions and to find the best and cost-efficient solution for cooling water pipelines when radiators were located on the roof of the power plant. Making this thesis began by gathering all the possible solutions together and di-vides into different groups depending on the solution. There were five different groups and five different solutions were selected for a closer inspection. While searching the best route for cooling water pipelines I gathered information by in-terviewing designers, pipe-experts and engineers. The result is a well-defined matrix table where the comparison and all the differ-ent pipeline solutions were gathered. Prices for pipelines (€/m and €/kg), entry to Power House, entry from top or under the hall and directness were taken into ac-count in the comparison. The result of this thesis is good basis to start standardiz-ing the certain solution. The matrix is not included in this thesis because the in-formation is classified.TĂ€mĂ€ pÀÀttötyö tehtiin WĂ€rtsilĂ€ Finland Oyj Power Plants yksikölle. Tavoitteena oli vertailla eri ratkaisutapoja ja löytÀÀ paras ja edullisin ratkaisu jÀÀhdytys-vesiputkistolle, kun jÀÀhdyttimet sijaitsivat voimalaitoksen katolla. PÀÀttötyön tekeminen alkoi kerÀÀmĂ€llĂ€ kaikki tĂ€mĂ€n hetkiset ratkaisumahdolli-suudet yhteen ja jakamalla ne ryhmiin kĂ€ytetyn ratkaisumallin mukaan. RyhmiĂ€ tuli 5 ja sieltĂ€ valittiin 5 erilaista ratkaisua lĂ€hempÀÀn tarkasteluun. Parasta putki-tusreittiĂ€ suunniteltaessa tietoa haettiin haastattelemalla suunnittelijoita, putkiasi-antuntijoita ja insinöörejĂ€. Lopputuloksena saatiin selkeĂ€ matriisitaulukko, johon on koottu kaikki erilaiset putkitusmahdollisuudet ja niistĂ€ tehty vertailu. Vertailussa on otettu huomioon putkitushinnat (€/m ja €/kg), putkituksen sisÀÀntuloreitti, sisÀÀntulo halliin ylĂ€- tai alaosasta sekĂ€ reitin suoruus. TĂ€mĂ€n tutkimustyön tuloksia on helppo kĂ€yttÀÀ jat-kossa, kun tiettyĂ€ putkitusratkaisua aletaan standardoida. Taulukkoa ei ole liitetty tĂ€hĂ€n työhön, koska tiedot ovat luottamuksellisia
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