The crack tip driving force of a crack growing from a pre-crack that is perpendicular to and terminating at an interface between two materials is investigated using a linear fracture mechanics theory. The analysis is performed both for a crack penetrating the interface, growing straight ahead, and for a crack deflecting into the interface. The results from finite element calculations are compared

To find a controller that provides the maximal stability margin to an LTI system under rank-one perturbations is a quasiconvex problem. In the paper, the dual quasiconvex problem is obtained, using the convex duality arguments in the Hardy space H∞. It is shown that the dual problem can be viewed as minimization of a "length" of uncertainties that destabilize the system. Several examples establish

We present the results of 3D high-resolution calculations of the last inspiral stages and the final coalescence of neutron star binary systems. The equations of hydrodynamics are solved using the smoothed particle hydrodynamics method with up to 106 particles. Using Newtonian gravity, but adding the forces emerging from the emission of gravitational waves, we focus on the impact of microphysics on

From an engineering point of view, uncertainty is present in all areas of design (products, processes and organizations). Computer-based design analysis, here confined to quantitative computer-based structural design analysis within mechanical engineering, serves as an important source of information in decisions taken during the design activity; importantly, it aims at giving confidence in critic

This paper describes a MSc level digital ASIC project course. The majority of the course participants are international students, having a wide spread in previous knowledge in the field of digital HW-design. A course outline adapting to this fact has been developed, changing from one joint VLSI project towards smaller individual projects. The diversity in previous knowledge is evened out by adding

Popular Abstract in Swedish Antibiotikaresistens hos pneumokocker har utvecklats till ett problem i hela världen. Interkontinental spridning av ett fåtal resistenta kloner verkar stå för den snabba ökningen av förekomsten av pneumokocker med nedsatt känslighet för penicillin (PNSP). Förekomst av PNSP har reducerat behandlingsalternativen för såväl vanliga luftvägsinfektioner som invasiva infektionPneumococcal resistance to antibiotics has become a worldwide problem. The rapid increase in frequency seems to be caused by intercontinental spread of a few resistant clones. Resistance to antibiotics in pneumococci has reduced the therapeutic arsenal for common respiratory tract infections as well as for invasive infections. Problems of specific clinical concern are meningitis due to penicillin-