Mach cones composed of shear waves were observed experimentally in a two-dimensional screened-Coulomb crystal. Highly charged microspheres suspended in a plasma and interacting with a repulsive Yukawa potential arranged themselves in a triangular lattice with hexagonal symmetry. Mach cones were excited by applying a force from the radiation pressure of a moving laser beam. They had a single-con...

The Mach 3.0 I/O system represents a radical departure from its predecessor { Mach 2.5, which relied on the BSD Unix model of device management. The I/O interface in Mach 3.0 supports device drivers that are largely device-independent, implemented at user-level, and location-independent. Our approach to device management signiicantly reduces the size of the kernel's machine-dependent code, enab...

1Dipartimento di Bioscienze e Territorio, Università del Molise, Pesche, Italy; [email protected] 2Laboratorio di Xilogenesi, Istituto per la Valorizzazione Legno e delle Specie Arboree (IVALSA), Consiglio Nazionale delle Ricerche, Sesto Fiorentino, Italy 3Dipartimento di Bioscienze e Territorio, Università del Molise; The EFI Project Centre on Mountain Forests (MOUNTFOR), Edmund Mach F...

A spatially non-dissipative, implicit numerical method to simulate turbulent reacting flows over a range of Mach numbers, is described. The compressible Navier–Stokes equations are rescaled so that the zero Mach number equations are discretely recovered in the limit of zero Mach number. The dependent variables are co-located in space, and thermodynamic variables are staggered from velocity in t...

Even though real-time systems have the stringent constraint of completing tasks before their deadlines, many existing real-time operating systems do not implement fault tolerance capabilities. In this paper we summarize fault tolerant real-time scheduling policy for dynamic tasks with ready times and deadlines. Our focus in this paper is the implementation, which includes fault-tolerant schedul...

In order to investigate the supersonic internal flows with shock waves, a new supersonic wind tunnel (pressure-vacuum type, Mach 2.0 and 4.0) was designed and constructed in Muroran Institute of Technology. This paper describes firstly outlines of the new Mach 4 supersonic wind tunnel, and describes secondly the location, structure and characteristics of the Mach 2 and 4 pseudo-shock waves in a...

We have built a software layer on top of Mach 2.5 that recovers multitask Mach applications from fail-stop failures. The layer implements Optimistic Recovery (OR), a mechanism for transparent recovery from failing tasks and processors, based on asynchronous checkpointing and logging of inter{task messages. OR recovers from failure by restoring a checkpoint and replaying the logged messages. The...