Improved Upper Limit on the Neutrino Mass from a Direct Kinematic Method by KATRIN.

We report on the neutrino mass measurement result from the first four-week science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are energy analyzed by a high-resolution MAC-E filter. A fit of the integrated electron spectrum over a narrow interval around the kinematic end point at 18.

Single-Electron Detection and Spectroscopy via Relativistic Cyclotron Radiation.

It has been understood since 1897 that accelerating charges must emit electromagnetic radiation. Although first derived in 1904, cyclotron radiation from a single electron orbiting in a magnetic field has never been observed directly. We demonstrate single-electron detection in a novel radio-frequency spectrometer.

Changing priorities for improvement: the impact of low response rates in patient satisfaction.

Background: A disturbing trend in patient satisfaction research has been a willingness to accept low response rates as inevitable. However, it may not be appropriate to generalize data based on low responses to the full population of patients, since to do so may threaten the validity of the findings.

Method: Satisfaction data were collected from 19,556 inpatients discharged in 1994 from 76 hospitals using the 69-item NCG Patient Viewpoint Survey, an instrument that primarily uses a set of five response options, which are transformed to a 0- to 100-point scale.