Diamond detectors with subnanosecond time resolution for heavy ion spill diagnostics

The application of CVD diamonds as radiation-hard particle detectors with outstanding properties for heavy ion beamline diagnostics is presented. Synchrotron particle spills ranging from a single ion to well beyond $10^8$  pps can be analyzed while maintaining single-particle time resolution below fractions of a nanosecond. With segmented electrode structures on the diamond surface, higher particle count rates and improved monitoring of x/y beam profiles can be achieved. Diamond detectors with areas up to $30 \times 30$ mm$^2$ for a precise measurement system for beam intensity, beam profiles, and spill time-structure are described

Towards a Hexagonal SiGe Semiconductor Laser

Hexagonal SiGe is shown to feature a direct bandgap with a radiative strength comparable to InP. Surprisingly, it features a temperature independent emission strength, thus promising a silicon compatible laser tunable from 1.8 to 3.5μm

Universality, Tolerance, Chaos and Order

What is the minimum possible number of edges in a graph that contains a copy of every graph on n vertices with maximum degree a most k? This question, as well as several related variants, received a considerable amount of attention during the last decade. In this short survey we describe the known results focusing on the main ideas in the proofs, discuss the remaining open problems, and mention a recent application in the investigation of the complexity of subgraph containment problems