We simulate penetration of large projectiles into dry granular media using two-dimensional soft particle molecular dynamics. We systematically vary the physical parameters of the projectile (density, size, impact energy). Our results confirm the recently observed scaling of the crater depth with impact energy as observed by Uehara et al. (2003) and the effect of constant deceleration of the bal...

Spectral cascade and energy dissipation of Alfven turbulence is studied using a massively parallel gyrokinetic particle simulation. The simulation observes a magnetic energy spectrum with a power law index of ”-5/3” in the long wavelength, which agrees with magnetohydrodynamic results in the inertial range. In the dissipation range, the simulation finds a spectral break point on the ion gyrorad...

Recent fineand microstructure observations indicate enhanced finescale shear and strain in conjunction with bottom intensified turbulent dissipation above regions of rough bathymetry. Such observations implicate the bottom boundary as an energy source for the finescale internal wavefield. They also pose a question. Can the vertical profile of turbulent dissipation be predicted from a model of w...

We adress the problem of interactions between the longitudinal velocity increment and the energy dissipation rate in fully developed turbulence. The coupling between these two quantities is experimentally investigated by the theory of stochastic Markovian processes. The so–called Markov analysis allows for a precise characterization of the joint statistical properties of velocity increment and ...

Crack fronts play a fundamental role in engineering models for fracture: they are the location of both crack growth and the energy dissipation due to growth. However, there has not been a rigorous mathematical definition of crack front, nor rigorous mathematical analysis predicting fracture paths using these fronts as the location of growth and dissipation. Here, we give a natural weak definiti...

Register file is a hot spot in contemporary microprocessors. As the number of instructions present in the processor at a given time increases, the size of the register file increases and it becomes a more important source of power dissipation inside the processor. Therefore it is important to pursue techniques that reduce the energy dissipation of register files. In this paper we present a tech...

A self-generation mechanism of magnetic dipoles and the anomalous energy dissipation of fast electrons in a magnetized beam-plasma system are presented. Based on two-dimensional particle-in-cell simulations, it is found that the magnetic dipoles are self-organized and play important roles in the beam electron energy dissipation. These dipoles drift slowly in the direction of the return flow wit...

Although division is less frequent than addition and multiplication, because of its longer latency it dissipates a substantial part of the energy in floating-point units. In this paper we explore the relation between the radix and the energy dissipated. Previous work has been done on radix-4 and radix-8 division. Here we extend this study to a radix16 scheme with two overlapped radix-4 stages a...

TOBUREN, MARK CHRISTOPHER. Power Analysis and Instruction Scheduling for Reduced di/dt in the Execution Core of High-Performance Microprocessors. (Under the direction of Dr. Thomas M. Conte.) Power dissipation is becoming a rst-order design issue in high-performance microprocessors as clock speeds and transistor densities continue to increase. As power dissipation levels rise, the cooling and r...

The continuing revolution in computer hardware is packing ever more logic gates in ever smaller volumes. Unfortunately this produces ever more heat, which will limit the feasible packing density and performance unless the energy dissipated by each logic operation can also be dramatically reduced. To reduce the energy dissipation of a logic operation below ln(2) kT (near thermal noise) requires ...