Entrevista com Tully Ehlers

Estudio experimental de la efectividad de la entrevista abierta frente a la entrevista independiente de contexto

Resumen. OBJETIVO: Estudiar la efectividad relativa de las técnicas de entrevista abierta y entrevista independiente de contexto en la identificación de requisitos para sistemas software. MÉTODO: Experimento controlado ensayando dos factores: “tipo de entrevista” (abierta e independiente de contexto) y “tipo de problema” (identificación de requisitos para dos sistemas software distintos). Debid...

Baryonic Tully-Fisher Relations

I describe the disk mass–rotation velocity relation which underpins the familiar luminosity–linewidth relation. Continuity of this relation favors nearly maximal stellar mass-to-light ratios. This contradicts the low mass-to-light ratios implied by the lack of surface brightness dependence in the same relation. 1. Searching for the Physical Basis of the Tully-Fisher Relation The Tully-Fisher (T...

Tully–Fisher Relation

Michael Ehlers

Michael Ehlers Biogen Michael Ehlers is Executive Vice President for Research & Development at Biogen, a leading biotechnology company. Dr. Ehlers grew up rural Nebraska and earned his bachelor’s degree in chemistry from Caltech. He holds MD and PhD degrees from the Johns Hopkins University School of Medicine, where he trained with Rick Huganir. Prior to joining Biogen in 2016, Dr. Ehlers was S...

Tully-Fisher relation

Detailed neutral hydrogen observations have been obtained of the large barred spiral galaxy NGC 3992 and its three small companion spiral galaxies, UGC 6923, UGC 6940, and UGC 6969. Contrary to the large galaxy, for the companions the H i distribution ends quite abruptly at the optical edges. Velocity fields have been constructed from which rotation curves have been derived. Assuming a reasonab...