Division and conquer

Integer division is an important arithmetic operation on microprocessors. To derive integer division algorithms we present an unconvential approach: a derivation technique in a calculational style, that guarantees that the derived algorithms are correct. Four different algorithms are derived using this method: restoring division, non-restoring divsion, radix-4 division and division by multiplication. We translate these to descriptions into combinatorial circuits, expressed in Verilog code. Then the circuits are compiled on a Spartan-3 Generation FPGA. At the end, we compare the propagation delays and area requirements for these circuits. We show that the division by multiplication is much faster than the other methods, however it only works for 18 bit integers. Integer division is an important arithmetic operation on microprocessors. To derive integer division algorithms we present an unconvential approach: a derivation technique in a calculational style, that guarantees that the derived algorithms are correct. Four different algorithms are derived using this method: restoring division, non-restoring divsion, radix-4 division and division by multiplication. We translate these to descriptions into combinatorial circuits, expressed in Verilog code. Then the circuits are compiled on a Spartan-3 Generation FPGA. At the end, we compare the propagation delays and area requirements for these circuits. We show that the division by multiplication is much faster than the other methods, however it only works for 18 bit integers

REMARKS ON THE MORPHOLOGY OF THE TEAK MOTH, HYBLAEA PUERA CR.

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A pelvic paraganglioma presenting as a hypertensive emergency in pregnancy

No Abstract

Dislocation Structure And Mobility In Hcp He 4

Using path-integral Monte Carlo simulations, we assess the core structure and mobility of the screw and edge basal-plane dislocations in hcp He4. Our findings provide key insights into recent interpretations of giant plasticity and mass flow junction experiments. First, both dislocations are dissociated into nonsuperfluid Shockley partial dislocations separated by ribbons of stacking fault, suggesting that they are unlikely to act as one-dimensional channels that may display Lüttinger-liquid-like behavior. Second, the centroid positions of the partial cores are found to fluctuate substantially, even in the absence of applied shear stresses. This implies that the lattice resistance to motion of the partial dislocations is negligible, consistent with the recent experimental observations of giant plasticity. Further results indicate that both the structure of the partial cores and the zero-point fluctuations play a role in this extreme mobility. © 2016 American Physical Society.117

VALIDATION OF A 5-DOF INSTRUMENTED SPEED SKATE; TOWARDS A POWER METER FOR SPEED SKATING

Speed skates are the most important part of equipment of a speed skater, where weight, rocker and bend are just a few characteristics that are to a high degree individualized. This poses a challenge for any type of research in speed skating where forces have to be measured in a reliable manner. For this purpose, a 5 degrees of freedom (DoF) instrumented speed skate (VU-Skate) has been designed and validated, weighing only 130 gram extra. Skaters use their own blades and shoes, something skaters are very keen on. A calibration tool has been developed to calibrate the 5 DoF. The quality of the data has been validated in 2 ways: 1. With the use of force plates and 2. By comparing the signals to another (also newly developed) Ultra-light Forces sensor. The results are remarkably good. This is the first step in being able to measure power continuously during each stroke

Welfare, social citizenship, and the spectre of inequality in Amsterdam

This article explores how notions of citizenship are negotiated in encounters between parents and youth care professionals in Amsterdam in the context of heated debates over citizenship and belonging. We draw on ethnographic research on Egyptian migrant parents' interactions with the welfare state, and on the work of youth care professionals. We found that both parents and professionals were invested in universal forms of citizenship. Parents wanted to be treated like their fellow citizens regardless of their background, while professionals wanted to care for all children. While parents feared and suspected that their children were subject to unfair treatment, professional practices left little space for disagreement or a consideration of racialized aspects of their encounters with clients. We conclude that notions of equal citizenship provide a primary, but uncertain ground for the elaboration of citizenship and belonging in parenting encounters, which is haunted by the spectre of difference and inequality.Horizon 2020(H2020)Global Challenges (FSW

Temperature effects on dislocation core energies in silicon and germanium

Temperature effects on the energetics of the 90-degree partial dislocation in silicon and germanium are investigated, using non-equilibrium methods to estimate free energies, coupled with Monte Carlo simulations. Atomic interactions are described by Tersoff and EDIP interatomic potentials. Our results indicate that the vibrational entropy has the effect of increasing the difference in free energy between the two possible reconstructions of the 90-degree partial, namely, the single-period and the double-period geometries. This effect further increases the energetic stability of the double-period reconstruction at high temperatures. The results also indicate that anharmonic effects may play an important role in determining the structural properties of these defects in the high-temperature regime.Comment: 8 pages in two-column physical-review format with six figure