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| 1 | An efficient enhanced k-means clustering algorithm显示文摘In k-means clustering, we are given a set of n data points in d-dimensional space úd and an integer k and the problem is to determine a set of k points in úd, called centers, so as to minimize the mean squared distance from each data point to its nearest center. In this paper, we present a simple and efficient clustering algorithm based on the k-means algorithm, which we call en- hanced k-means algorithm. This algorithm is easy to implement, requiring a simple data structure to keep some information in each iteration to be used in the next iteration. Our experimental results demonstrated that our scheme can improve the computational speed of the k-means algorithm by the magnitude in the total number of distance calculations and the overall time of computation. | FAHIM A.M SALEM A.M TORKEY F.A RAMADAN M.A | 2006 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2006，7，10： | 28 |
| 2 | Semi-solid processing of hypereutectic A390 alloys using novel rheoforming process显示文摘The feasibility of semi solid processing of hypereutectic A390 alloys using a novel rheoforming process was investigated.A combination of the swirl enthalpy equilibration device (SEED) process, isothermal holding using insulation and addition of solid alloy during swirling was introduced as a novel method to improve the processability of semi solid slurry.The effects of isothermal holding and the addition of solid alloy on the temperature gradient between the centre and the wall and on the formation of α(Al) particles were examined.In additional tests, phosphorus and strontium were added to the molten metal to refine the primary and eutectic silicon structure to facilitate semi solid processing.The results show that the combination of the SEED process with two additional processing steps can produce semi-solid A390 alloys that can be rheoprocessed.The microstructure reveals an adequate amount of non-dendritic α(Al) globules surrounded by liquid, which greatly improves the processability of semi-solid slurry. | M.TEBIB J.B.MORIN F.A JERSCH X.GRANT CHEN | 2010 | Transactions of Nonferrous Metals Society of China2010，20，9： | 10 |
| 3 | Heavy metal contents of livestock feeds and animal manures in England and Wales显示文摘 | F.A Nicholson B.J Chambers J.R Williams R.J Unwin | 1999 | Bioresource Technology1999，，1： | 2 |
| 4 | Identifying Organizational Identification显示文摘 | Mael F.A Ashforth B.E | | 0，，04： | 1 |
| 5 | Precipitation modification of major urban areas显示文摘 | Huff F.A S.A.Changnon | | 0，，： | 1 |
| 6 | How sovereign is sovereign credit risk显示文摘 | Longstaff F.A Pan J Pedersen L.H Singleton K.J | | 0，，： | 1 |
| 7 | Risk-based assessment of soil and ground water quality in the Netherlands:standards and remediation urgency显示文摘 | Swartjes F.A | | 0，，06： | 1 |
| 8 | Preparation and NMR characterization of superporous hydrogels (SPH) and SPH composites显示文摘 | F.A Dorkoosh J Brussee J.C Verhoef G Borchard M Rafiee-Tehrani H.E Junginger | 2000 | Polymer2000，，23： | 1 |
| 9 | Reprocessing and enhanced interpretation of the initial COCORP Southern Appalachians traverse显示文摘 | Cook F.A Vasudevan K | | 0，，： | 1 |
| 10 | Diagnostic accuracy of endoscopic ultrasound-guided fine-needle aspiration in patients with presumed pancreatic cancer显示文摘 | Chandrajit P. Raut M.D. M.Sc. Ana M. Grau M.D. Gregg A. Staerkel M.D. Madhukar Kaw M.D. Eric P. Tamm M.D. Robert A. Wolff M.D. Jean-Nicolas Vauthey M.D. F.A.C.S. Jeffrey E. Lee M.D. F.A.C.S. Peter W. T. Pisters M.D. F.A.C.S. Douglas B. Evans M.D. F.A | 2003 | Journal of Gastrointestinal Surgery2003，，1： | 1 |
| 11 | Ataxia in prion protein (PrP)-deficient mice is associated with upregulation of the novel PrP-like protein doppel 1 1 Edited by P. E. Wright显示文摘 | Richard C Moore Inyoul Y Lee Gregory L Silverman Paul M Harrison Robert Strome Cornelia Heinrich Amila Karunaratne Stephen H Pasternak M.Azhar Chishti Yan Liang Peter Mastrangelo Kai Wang Arian F.A Smit Shigeru Katamine George A Carlson Fred E Cohen Stanl | 1999 | Journal of Molecular Biology1999，，4： | 1 |
| 12 | Immunocytochemical loca-lization of carbonic anhydrase in myelinated fiber in pe-ripheral nerves of rat and mouse显示文摘 | Cammer W Tansey F.A | | 0，，08： | 1 |
| 13 | A technical note on artificial milk feeding of rabbit kits weaned at 14 days显示文摘 | Ferguson F.A Lukefahr S.D McNitt J.I | | 0，，： | 1 |
| 14 | Valuing American Options by Simulation:A Simple Least-squares Approach显示文摘 | Longstaff F.A Schwartz E.S | | 0，，： | 1 |
| 15 | Assumptions Commonly Underlying Government Quality Assessment Practices显示文摘 | Schmidtlein F.A | | 0，，04： | 1 |
| 16 | A new Andean deep ice core from Nevado Illimani (6350 m), Bolivia显示文摘 | E Ramirez G Hoffmann J.D Taupin B Francou P Ribstein N Caillon F.A Ferron A Landais J.R Petit B Pouyaud U Schotterer J.C Simoes M Stievenard | 2003 | Earth and Planetary Science Letters2003，，3： | 1 |
| 17 | 查看详情显示文摘 | Torre G.D.L Váquez P López F.A Torres T | | 0，，： | 1 |
| 18 | The use of knowledge in society显示文摘 | Hayek F.A | | 0，，04： | 1 |
| 19 | Antibacterial and Antioxidant Activities of Quercetin Oxidation Products from Yellow Onion (Allium cepa) Skin显示文摘 | Ramos F.A Takaishi Y | | 0，，54： | 1 |
| 20 | Epitaxial superconductors on rolling-assisted biaxially-textured substrates (RABiTS): a route towards high critical current density wire显示文摘 | A Goyal D.P Norton D.K Christen E.D Specht M Paranthaman D.M Kroeger J.D Budai Q He F.A List R Feenstra H.R Kerchner D.F Lee E Hatfield P.M Martin J Mathis C Park | 1997 | Applied Superconductivity1997，，： | 1 |
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