Tài liệu HIGH PERFORMANCE DRIVES Chapter4 pdf

... mechanical energy by means of electrical drives, and about 20 % HIGH PERFORMANCE DRIVES  E Levi, 2001 10 of drives are variable speed drives. Variable speed drives which were for an extended period ... the considerations of this sub-section and discussion of high performance DC motor drives, the following statements can be made: • High performance operation requires tha...

Ngày tải lên: 26/12/2013, 01:17

... under consideration. HIGH PERFORMANCE DRIVES  E Levi, 2001 69 () T dom 4 005 450 10 250 1 6 σ ==>> − . x When this ratio is much larger than one (this is in general always the case in vector controlled drives) , the ... constant: () () LX LX LLL TLR mm rr rmr rrr === === =+= == = 2 50 132 100 0 42 2 50 12.6 100 0 04 046 046 63 73ms π π ππ γγ γ /. /. . ./. H H H HIGH PERFORMA...

Ngày tải lên: 23/01/2014, 06:20

... High Performance MySQL: Optimi- zation, Backups, Replication, and More, Second Edition, by Baron Schwartz et al. Copyright 2008 O’Reilly Media, Inc., 9780596101718.” 156 | Chapter 4: Query Performance ... join strategy later in this chapter.) 160 | Chapter 4: Query Performance Optimization Query Execution Basics If you need to get high performance from your MySQL server, one of the...

Ngày tải lên: 10/12/2013, 06:15

... for the connection of the latest, highly reliable, high performance peripheral devices such as RAID disks. FC offers the advantages of connectivity to newer high performance RAID stor- age systems ... Nisshin-cho, Fuchu, Tokyo, Japan, 4 NEC High Performance Computing Europe GmbH, Prinzenallee 11, D-40549 D¨usseldorf, Germany Abstract In 2003, the High Performance Computing Cent...

Ngày tải lên: 15/12/2013, 13:15

... to thank Uwe K¨uster of the High Performance Comput- ing Center Stuttgart’ (HLRS) for his continuing interest and most helpful advice and the staff of ‘NEC – High Performance Computing Europe’ ... Computing (5)65 (2005) 553–563 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. The...

Ngày tải lên: 24/12/2013, 19:15

... of FEM performance. Comput Methods Appl Mech Eng 51 (1985) 3–29 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com ... carrying out 3D simu- lations for complex geometries and flow with high Reynolds number is nowadays time consuming even for high performance computers, Fig. 1. Therefore, DNS is unlikely to...

Ngày tải lên: 24/12/2013, 19:15

... Comp. Phys. 117 (1995) 1–19 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Toward TFlop ... 128k Fig. 3. Scaling of IMD on the Itanium (top) and Xeon (bottom) systems Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. 188 M. Bernreuther, J. Vrabec in most...

Ngày tải lên: 24/12/2013, 19:15

... while positive values denote damping. Figure 16 shows that the highest amplification Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Direct Numerical Simulation of ... grid-stretching-parameters is nontrivial. 5Performance Good computational performance of a parallel code is first of all based on its single processor performance. As the NEC SX-8 is a vector c...

Ngày tải lên: 24/12/2013, 19:15

... purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Part I Introduction Please purchase PDF Split-Merge ... been able to finish this book. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark...

Ngày tải lên: 21/01/2014, 18:20

... continue. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Part V Other Data-Intensive Applications Please purchase PDF Split-Merge on www.verypdf.com to remove this ... the underlying dimensions. The higher the cardinality, the greater is the number of subtotals that need to be computed. Please purchase PDF Split-Merge on www.verypdf.com to remove this water...

Ngày tải lên: 21/01/2014, 18:20