Results 51 to 60 of about 7,982,343 (363)
Efficient Sorting, Duplicate Removal, Grouping, and Aggregation
ACM Transactions on Database Systems, 2022 Database query processing requires algorithms for duplicate removal, grouping, and aggregation. Three algorithms exist: in-stream aggregation is most efficient by far but requires sorted input; sort-based aggregation relies on external merge sort; and hash aggregation relies on an in-memory hash table plus hash partitioning to temporary storage.
Thanh Do, Goetz Graefe, Jeffrey Naughton
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Oxygen control and improved denitrification efficiency by means of a post-anoxic reactor [PDF]
, 2015 The presence of dissolved oxygen (DO) in biological denitrification reactors determines inhibition effects on the denitrification rate. The article shows the results of an experimental study to control the DO concentration in the pre-denitrification ...
Gavasci, Renato +2 more
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Rudarsko-geološko-naftni ZbornikA bauxite reserve with an Al2O3 grade less than 50% is classified as low-grade bauxite due to the presence of impurities such as silica and iron oxide, thus pretreatment before concentration (Bayer process) is required to reduce SiO2 and Fe2O3.
Amirhossein Ashrafi +2 more
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Toxics, 2023 The intensive use of antibiotics (for human, veterinary, and agricultural purposes) has steadily increased over the last 30 years. Large amounts of antibiotic residues are released into aquatic systems, mostly due to inefficient wastewater treatment ...
Luyanda L. Ndlela +3 more
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Experimental study on nitrification in a submerged aerated biofilter [PDF]
, 2004 The aim of the present work was to evaluate the performance of a semi-pilot scale BAF in order to obtain a highly polished effluent in terms of removal of organic matter, suspended solids and ammonia and to observe the influence of temperature, pH and ...
Chiavola, Agostina +3 more
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Plants, 2020 Arsenic is considered to be a toxic and heavy metal that exists in drinking water and can lead to acute biotoxicity. Water mimosa (Neptunia oleracea) has been widely identified as a feasible phytoremediator to clean up aquatic systems.
Narges Atabaki +4 more
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Efficient, Proximity-Preserving Node Overlap Removal
Journal of Graph Algorithms and Applications, 2010 Summary: When drawing graphs whose nodes contain text or graphics, the non- trivial node sizes must be taken into account, either as part of the initial layout or as a post-processing step. The core problem in avoiding or removing overlaps is to retain the structural information inherent in a layout while minimizing the additional area required.
Gansner, Emden, Hu, Yifan
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Chicken Cartilage-Derived Carbon for Efficient Xylene Removal
International Journal of Molecular Sciences, 2023 Chicken cartilage was used for the first time as a raw material for the microwave-assisted synthesis of biochar and activated carbon. Various microwave absorbers, i.e., commercial active carbon, scrap tyres, silicon carbide, and chicken bone-derived biochar, as well as various microwave powers, were tested for their effect on the rate of pyrolysis and ...
Joanna Dobrzyńska +2 more
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Experimental on the Electrokinetic Remediation of Pb(II) Contaminated Loess
International Journal of Electrochemical Science, 2021 Pb(II) accumulates in the human body through the food chain or drinking water and thus causes damage to the nervous, hematological, gastrointestinal, cardiovascular, and renal systems.
Gang Li +4 more
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Ant species that remove diaspores alone are more efficient removers
Sociobiology, 2022 Secondary diaspore removal on the ground is an important ecosystem process. In this process, solitary foraging ants with larger body sizes are more efficient because they may remove more diaspores, faster and carry them at greater distances. Therefore, we sought to test the effects of the sizes of the morphological traits of ants, removal strategy, and
Wilker, Icaro +3 more
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