An additive symmetric value b of a with respect to c satis1es c = (a + b)=2. Existence and uniqueness of such b are basic properties in exact arithmetic that fail when a and b are 8oating point numbers and the computation of c performed in IEEE-754-like arithmetic. We exhibit and prove conditions on the existence, the uniqueness and the consistency of an additive symmetric value when b and c ha...

⎯ This paper reports the speedup improvement of sorting of floating-point numbers. It shortens the computing time significantly by applying integer arithmetic on floating-point data with IEEE-754 standard or a similar kind. Our few Gigabyte sorting achieves about five-fold speedups on internal sort only, and two-fold or more improvement over NOW-sort. Potential applications of the method includ...

We present and analyze several implementations of the interval arithmetic narrowing function for multiplication. Starting from the Cleary algorithm for narrowing multiplication we describe two optimizations which produce code that is 10-15 times faster on the average. Finally, we propose a few simple RISC instructions which would allow eecient execution of interval arithmetic and narrowing rout...

1. Cnikkshank D W J. The analysis of the anisotropic thermal motion of molecules in crystals. Acta Crystallogr. 9:754-6, 1956. 2. Brenner H. Coupling between the translational and rotational Brownian motions of rigid particles of arbitrary shape. J. Colloid Interface Sci. 23:407-36, 1967. 3Trueblood K N. Analysis of molecular motion with allowance for intramolecular torsion. Acta Crystallogr. A...

AIM To define the sentinel node identification rate in breast cancer, the chronological evolution of this parameter and the influence of the introduction of a portable gamma camera. MATERIAL AND METHODS A retrospective study was conducted using a prospective database of 754 patients who had undergone a sentinel lymph node biopsy between January 2003 and December 2011. The technique was mixed ...

Frey HP and Zieloff K (1992) Qualitative und quantitative Du( nschicht-Chromatographie. Weinheim: VCH. Fried B and Sherma J (eds) (1996) Practical Thin Layer Chromatography: A Multidisciplinary Approach. Boca Raton, FL: CRC Press. Jork H, Funk W, Fischer W and Wimmer H (1990) Thin Layer Chromatography, vol. 1a. Physical and Chemical Detection Methods. Weinheim: VCH. Jork H, Funk W, Fischer W an...

We use Chandra data to derive a detailed gas temperature map of the nearby, hot, merging galaxy cluster A754. Combined with the X-ray and optical images, the map reveals a more complex merger geometry than previously thought, possibly involving more than two subclusters or a cool gas cloud sloshing independently from its former host subcluster. In the cluster central region, we detect spatial v...

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The fused multiply-add operation improves many calculations and therefore is already available in some generalpurpose processors, like the Itanium. The optimization of units dedicated to execute the multiply-add operation is therefore crucial to achieve optimal performance when running the overlying applications. In this paper, we present a single-precision floating-point fused multiply-add opt...

the measurement of wheat crop yield in large areas is time consuming and requires high expenses. one way to save time and cost, using geostatistical methods for mapping crop yield. in this research principle component analysis were used for identifying variables that have correlation with each other, and kriging and cokriging were used to map crop yield prediction. fourty six samples were used ...