Job schedulers improve the system utilization by requiring users to estimate how long their jobs will run and by using this information to better pack (or “backfill”) the jobs. But, surprisingly, many studies find that deliberately making estimates less accurate boosts (or does not affect) the performance, which helps explain why production systems still exclusively rely on notoriously inaccura...

Cosmic microwave anisotropy satellites promise extremely accurate measures of the amplitude of perturbations in the universe. We use a numerical code to test the accuracy of existing approximate expressions for the amplitude of perturbations produced by single-field inflation models. We find that the second-order Stewart– Lyth calculation gives extremely accurate results, typically better than ...

Objectives: After validation of impedance cardiography (ICG) in healthy children, this same device was tested in children with cystic fibrosis (CF) to validate its capability of measuring cardiac output (Q) in this population. Design: Comparative study of ICG vs the indirect Fick (C02) method. Setting: Tertiary care children's teaching hospital. Patients: Twenty-one CF children with mean FEVX o...