1,720,994 research outputs found
Home-based cooperative cache for parallel I/O applications
No full textRecently, there has been much research about cluster computing to get high performance using low-cost nodes connected with high-speed networks. In many research fields, many I/O subsystems which access disks slower than any other component in cluster computing have been proposed such as parallel distributed file systems and Cooperative Cache. In many I/O subsystems, Cooperative Cache was proposed to reduce servers' load and to achieve high performance by sharing nodes' caches. Previous researches about Cooperative Cache focus on how to efficiently manage read caches and do not care about the write policy. In parallel I/O applications, which use cluster computing, there are many write accesses as well as read accesses. To improve the overall I/O performance, it is necessary to improve write performance as well is read performance. In this paper. we propose the home-based Cooperative Cache. In the home-based Cooperative Cache, every block has its static home. The home node of a block does the read caching and the write buffering of the block. We apply the home-based Cooperative Cache to Parallel Virtual File System (PVFS) and Cooperative Cluster File System (CCFS). Also, we evaluate and analyze the performance of the home-based Cooperative Cache in PVFS and in CCFS. (C) 2005 Elsevier B.V. All rights reserved
Characterization of zeolite-supported Pt-Ir bimetallic catalysts prepared by decoration of Ir
No full textCharacterization of zeolite supported Pt-Zr bimetallic catalyst prepared by Ir decolation
No full textSelective catalytic reduction with hydrocarbon over mutiple metal oxide and metal supported metal oxide catalysts
No full textCharacterization of zeolite supported Pt-Ir bimetallic clustere prepared by decoration of Ir
No full textDEACTIVATION CHARACTERISTICS IN N-HEPTANE REFORMING REACTION CATALYZED OVER SMALL PT, IR AND PT-IR BIMETALLIC CLUSTERS IN NAY
No full textThe deactivation characteristics of highly dispersed (about 1 nm) Pt, Ir and Pt-Ir bimetallic clusters in NaY were studied by hydrogen chemisorption, coke analysis and temperature programmed oxidation of used catalyst in n-heptane reforming reaction. As the Ir content was increased, the amount of coke decreased. Most of coke was located around the metal cluster and this coke decreased the selectivity of dehydrocyclization in n-heptane reaction. The higher activity and more improved activity maintenance of Pt-Ir/NaY bimetallic catalysts than those of Pt/NaY are related to the less amount of coke formation
Water-Dispersible Magnetite-Reduced Graphene Oxide Composites for Arsenic Removal
No full textMagnetite-graphene hybrids have been synthesized via a chemical reaction with a magnetite particle size of similar to 10 nm. The composites are superparamagnetic at room temperature and can be separated by an external magnetic field. As compared to bare magnetite particles, the hybrids show a high binding capacity for As(III) and As(V), whose presence in the drinking water in wide areas of South Asia has been a huge problem. Their high binding capacity is due to the increased adsorption sites in the M-RGO composite which occurs by reducing the aggregation of bare magnetite. Since the composites show near complete (over 99.9%) arsenic removal within 1 ppb, they are practically usable for arsenic separation from water.X1111321028sciescopu
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