Nano-electromechanical (NEM) relays are an alternative to CMOS transistors as the fabric of digital circuits. Circuits with NEM relays offer energy-efficiency benefits over CMOS since they have zero leakage power and are strategically designed to maintain throughput that is competitive with CMOS despite their slow actuation times. The floating-point unit (FPU) is the most complex arithmetic uni...

This paper presents the performance of DSP, image and 3D applications on recent general-purpose microprocessors using streaming SIMD ISA extensions (integer and oating point). The 9 benchmarks benchmark we use for this evaluation have been optimized for DLP and caches use with SIMD extensions and data prefetch. The result of these cumulated optimizations is a speedup that ranges from 1.9 to 7.1...

We consider FPU-type atomic chains with general convex potentials. The naive continuum limit in the hyperbolic space-time scaling is the p-system of mass and momentum conservation. We systematically compare Riemann solutions to the p-system with numerical solutions to discrete Riemann problems in FPU chains, and argue that the latter can be described by modified p-system Riemann solvers. We all...

1. Models of coupled oscillators 2. Two main classes (a) Models with on-site potentials; e.g. Frenkel-Kontorova or discrete NLS (b) Models with only nearest neighbor coupling; e.g. FPU type models 3. Focus on: (a) localized oscillations (b) traveling waves 4. Numerical experiments of Kruskal and Zabusky and the discovery of solitons. 5. The formal approximation of the FPU model by the KdV equat...

1 Linux is a popular operating system for embedded systems. Some embedded systems use processors without floating point accelerators (FPA) or floating point units (FPU), in order to satisfy cost and power consumption requirements. This paper describes and compares optimization options for software implementation of floating point operations on systems without FPA or FPU. Our results show that s...

13 Cellulase production in cultures of Acremonium cellulolyticus was significantly 14 improved by using waste milk pack (MP) that had been pretreated with cellulase. When 15 MP cellulose pretreated with cellulase (3 FPU/g MP) for 12 h was used as the sole 16 carbon source for A. cellulolyticus culture in a 3-L fermentor, the cellulase activity was 17 16 FPU/ml. This was 25-fold higher (0.67 FPU...

with potential V (x) = γe + V1x + V2 and γ, δ, V1, V2 ∈ R constants. The Toda lattice has been introduced by Toda [12] and studied extensively in the sequel. It is an FPU lattice, i.e. a Hamiltonian system of particles in one space dimension with nearest neighbor interaction. Models of this type have been studied by Fermi-Pasta-Ulam [FPU]. In numerical experiments they found recurrent features ...

We present an analytical study of the Fermi–Pasta–Ulam (FPU) α– model with periodic boundary conditions. We analyze the dynamics corresponding to initial data with some low frequency Fourier modes excited. We show that, correspondignly, a pair of KdV equations constitute the resonant normal form of the system. We also use such a normal form in order to prove the existence of a metastability phe...

We present a detailed analysis of the modulational instability of the zone-boundary mode for one and higher-dimensional Fermi-Pasta-Ulam (FPU) lattices. Following this instability, a process of relaxation to equipartition takes place, which we have called the Anti-FPU problem because the energy is initially fed into the highest frequency part of the spectrum, at variance with the original FPU p...