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Listar por Patrocinador "Helmholtz Association of German Research Centers"

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Acceleration of PageRank with customized precision based on mantissa segmentation

Gruetzmacher, Thomas; Cojean, Terry; Flegar, Goran; Anzt, Hartwig; Quintana-Orti, Enrique S. (Association for Computing Machinery, 2020-03)

[EN] We describe the application of a communication-reduction technique for the PageRank algorithm that dynamically adapts the precision of the data access to the numerical requirements of the algorithm as the iteration ...
Adaptive Precision Block-Jacobi for High Performance Preconditioning in the Ginkgo Linear Algebra Software

Flegar, Goran; Anzt, Hartwig; Cojean, Terry; Quintana-Ortí, Enrique S. (Association for Computing Machinery, 2021-04)

[EN] The use of mixed precision in numerical algorithms is a promising strategy for accelerating scientific applications. In particular, the adoption of specialized hardware and data formats for low-precision arithmetic ...
Adaptive precision in block-Jacobi preconditioning for iterative sparse linear system solvers

Anzt, Hartwig; Dongarra, Jack; Flegar, Goran; Higham, Nicholas J.; Quintana Ortí, Enrique Salvador (John Wiley & Sons, 2019-03-25)

[EN] We propose an adaptive scheme to reduce communication overhead caused by data movement by selectively storing the diagonal blocks of a block-Jacobi preconditioner in different precision formats (half, single, or ...
Bulk transport and oxygen surface exchange of the mixed ionic-electronic conductor Ce1 xTbxO2-d (x=0.1, 0.2, 0.5)

Balaguer Ramírez, María; Yoo, C.Y.; Bouwmeester, H.J.M; Serra Alfaro, José Manuel (Royal Society of Chemistry, 2013)

Bulk ionic and electronic transport properties and the rate of oxygen surface exchange of Tb-doped ceria have been evaluated as a function of Tb concentration, aiming to assess the potential use of the materials as ...
Characterisation of the Hamamatsu photomultipliers for the KM3NeT Neutrino Telescope

Aiello,S.; Akrame, S. E.; Ameli, F.; Anassontzis, E. G.; Andre, M.; Androulakis, G.; Anghinolfi, M.; Anton, G.; Ardid Ramírez, Miguel; Aublin, J.; Avgitas, T.; Baars, M.; Bagatelas, C.; Barbarino, G.; Baret, B.; Martínez Mora, Juan Antonio (IOP Publishing, 2018-05)

[EN] The Hamamatsu R12199-02 3-inch photomultiplier tube is the photodetector chosen for the first phase of the KM3NeT neutrino telescope. About 7000 photomultipliers have been characterised for dark count rate, timing ...
Compression and load balancing for efficient sparse matrix-vector product on multicore processors and graphics processing units

Aliaga, José I.; Anzt, Hartwig; Grützmacher, Thomas; Quintana-Ortí, Enrique S.; Tomás Domínguez, Andrés Enrique (John Wiley & Sons, 2022-06-25)

[EN] We contribute to the optimization of the sparse matrix-vector product by introducing a variant of the coordinate sparse matrix format that balances the workload distribution and compresses both the indexing arrays and ...
Development of CO2 Protective Layers by Spray Pyrolysis for Ceramic Oxygen Transport Membranes

García Torregrosa, Iván; Lobera González, Maria Pilar; Solis Díaz, Cecilia; Atienzar Corvillo, Pedro Enrique; Serra Alfaro, José Manuel (Wiley-VCH Verlag, 2011)

[EN] Ceramic mixed ionic¿electronic conducting (MIEC) membranes enable very selective oxygen separation from air at high temperatures. Two major potential applications of oxygen-transport membranes are: i) oxygen production ...
Engineering microstructure and redox properties in the mixed conductor Ce0.9Pr0.1O2-d+Co 2 mol %

Balaguer Ramírez, María; Solis Díaz, Cecilia; Roitsch, Stefan; Serra Alfaro, José Manuel (Royal Society of Chemistry, 2014)

10% Praseodymium doped ceria exhibits a combination of mixed ionic and electronic conductivity, redox catalytic properties and chemical compatibility with water and carbon dioxide at high temperatures. Minor additions of ...
Enhanced H2 Separation through Mixed Proton Electron Conducting Membranes Based on La5.5W0.8M0.2O11.25 d

Escolástico Rozalén, Sonia; Seeger, J.; Roitsch, S.; Ivanova, M.; Meulenberg, Wilhem Albert; Serra Alfaro, José Manuel (Wiley-VCH Verlag, 2013-08)

La5.5WO11.25- is a proton-conducting oxide that shows high protonic conductivity, sufficient electronic conductivity, and stability in moist CO2 environments. However, the H-2 flows achieved to date when using La5.5WO11.25- ...
Ethylene Production by ODHE in Catalytic Modified Ba0.5Sr0.5Co0.8Fe0.2O3 Membrane Reactors

Lobera González, Maria Pilar; Escolástico Rozalén, Sonia; García Fayos, Julio; Serra Alfaro, José Manuel (Wiley-VCH Verlag, 2012)

[EN] Process intensification by the integration of membranes and high-temperature reactors offers several advantages with regard to conventional process schemes, that is, energy saving, safe operation, reduced plant/unit ...
Functional properties of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ proton conductors where X is an alkaline earth cation

Ivanova, Mariya E; Meulenberg, Wilhelm A.; Palisaitis, Justinas; Sebold, Doris; Solis Díaz, Cecilia; Ziegner, Mirko; Serra Alfaro, José Manuel; Mayer, Joachim; Hänsel, Michael; Guillon, Olivier (Elsevier, 2015-04)

Lanthanum niobates with general formulas of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ (X = Mg, Ca, Sr or Ba) were synthesized via the conventional solid state reaction. Specimens with relative density ...
Ginkgo: A Modern Linear Operator Algebra Framework for High Performance Computing

Anzt, Hartwig; Cojean, Terry; Flegar, Goran; Göbel, Fritz; Grützmacher, Thomas; Nayak, Pratik; Ribizel, Tobias; Tsai, Yuhsiang Mike; Quintana-Ortí, Enrique S. (Association for Computing Machinery, 2022-03)

[EN] In this article, we present GINKGO, a modern C++ math library for scientific high performance computing. While classical linear algebra libraries act on matrix and vector objects, Gnswo's design principle abstracts ...
High Ethylene Production through ODHE Membrane Reactors based on Fast Oxygen-Ion Conductors

Lobera González, Maria Pilar; Escolástico Rozalén, Sonia; Serra Alfaro, José Manuel (Wiley-VCH Verlag, 2011-09-19)

[EN] High ethylene productivity through the oxidative dehydrogenation of ethane has been achieved in a catalytic membrane reactor based on a highly solid-state oxygen permeable material (Ba0.5Sr0.5Co0.8Fe0.2O3 d). ...
Hydrogen separation in La5.5WO11.25-delta membranes

Escolástico Rozalén, Sonia; Solis Díaz, Cecilia; Scherb, Tobias; Schumacher, Gerhard; Serra Alfaro, José Manuel (Elsevier, 2013-10-01)

Tungstates Ln(6)WO(12) are proton conducting crystalline materials which show significant mixed protonic and electronic conductivity and stability in moist CO2 environments. These materials are promising candidates for ...
Hydrogen separation through tailored dual phase membranes with nominal composition BaCe0.8Eu0.2O3-delta:Ce0.8Y0.2O2-delta at intermediate temperatures

Ivanova, Mariya E.; Escolástico Rozalén, Sonia; Balaguer Ramírez, María; Palisaitis, Justinas; Sohn, Yoo Jung; Meulenber, Wilhelm A.; Guillon, Olivier; Mayer, Joachim; Serra Alfaro, José Manuel (Nature Publishing Group, 2016-11-04)

[EN] Hydrogen permeation membranes are a key element in improving the energy conversion efficiency and decreasing the greenhouse gas emissions from energy generation. The scientific community faces the challenge of identifying ...
Ionic transport through chemically functionalized hydrogen peroxide-sensitive asymmetric nanopores

Ali, Mubarak; Ahmed, Ishtiaq; Nasir, Saima; Ramirez Hoyos, Patricio; Niemeyer, Christof M; Mafe, Salvador; Ensinger, Wolfgang (American Chemical Society, 2015-09)

We describe the fabrication of a chemical-sensitive nanofluidic device based on asymmetric nanopores whose transport characteristics can be modulated upon exposure to hydrogen peroxide (H2O2). We show experimentally and ...
Metal-Specific Reactivity in Single-Atom Catalysts: CO Oxidation on 4d and 5d Transition Metals Atomically Dispersed on MgO

Sarma, Bidyut B.; Plessow, Philipp N.; Agostini, Giovanni; Concepción Heydorn, Patricia; Pfänder, Norbert; Kang, Liqun; Wang, Feng R.; Studt, Felix; Prieto González, Gonzalo (American Chemical Society, 2020-09-02)

[EN] Understanding and tuning the catalytic properties of metals atomically dispersed on oxides are major stepping-stones toward a rational development of single-atom catalysts (SACs). Beyond individual showcase studies, ...
Nd5.5W1xUxO11.25-delta system: Electrochemical characterization and hydrogen permeationstudy

Escolástico Rozalén, Sonia; Serra Alfaro, José Manuel (Elsevier, 2015-09-01)

This work presents the structural and electrochemical characterization of mixed conducting materials based on the system Nd5.5W1-xUxO11.25-delta where x = 0.1, 0.5 and 1. The evolution of the crystalline structure is studied ...
One Pot Cooperation of Single Atom Rh and Ru Solid Catalysts for a Selective Tandem Olefin Isomerization - Hydrosilylation Process

Sarma, Bidyut B.; Kim, Jonglack; Amsler, Jonas; Agostini, Giovanni; Weidenthaler, Claudia; Pfaender, Norbert; Arenal, Raul; Concepción Heydorn, Patricia; Plessow, Philipp; Studt, Felix; Prieto González, Gonzalo (John Wiley & Sons, 2020-03-27)

[EN] Realizing the full potential of oxide-supported single-atom metal catalysts (SACs) is key to successfully bridge the gap between the fields of homogeneous and heterogeneous catalysis. Here we show that the one-pot ...
One-Pot Synthesis of nickel-modified carbon nitride layers toward efficient photoelectrochemical cells

Zhang, Wenyao; Albero-Sancho, Josep; Xi, Lifei; Lange, Kathrin M.; García Gómez, Hermenegildo; Wang, Xin; Shalom, Menny (American Chemical Society, 2017-09-27)

[EN] A new method to significantly enhance the photoelectrochemical properties of phenyl-modified carbon nitride layers via the insertion of nickel ions into carbon nitride layers is reported. The nickel ions: are embedded ...