Combustion in homogeneous charge compression ignition (HCCI) engine is controlled auto ignition of well-mixed fuel, air and residual gas. Since onset of HCCI combustion depends on the auto ignition of fuel/air mixture, there is no direct control on the start of combustion process. Therefore, HCCI combustion becomes unstable rather easily especially at lower and higher engine load. Charge strati...

Enterprise-system upgrades are unreliable and often produce downtime or data-loss. Errors in the upgrade procedure, such as broken dependencies, constitute the leading cause of upgrade failures. We propose a novel upgradecentric fault model, based on data from three independent sources, which focuses on the impact of procedural errors rather than software defects. We show that current approache...

After six years of operation the electron proton collider HERA had reached a luminosity of 1:4 10 cm s , very close to the design value. We present an overview on the HERA upgrade project that pursues the goal to further increase the luminosity three-fold by the year 2000. The increase is achieved by reducing the beam cross sections at the IP to 120 30 m (RMS values). If furthermore design curr...