John Norris Bahcall 1935–2005

John , III , Amy L . Tucker , Pamela M . Norris and J . Randall Moorman Cristina

The Scientific Life of

This article follows the scientific life of John Norris Bahcall, including his tenacious pursuit of the solar neutrino problem, his contributions to our understanding of galaxies, quasars, and their emissions, and his leadership of and advocacy for astronomy and astrophysics.

Bruno Rossi and Norris

HE purpose of the experiment described in the present paper was to determine the disintegration curve of mesotrons at rest. The experiment was performed by investigating the delayed emission of the disintegration electrons, which takes place after the absorption of mesotrons by matter. Experiments more or less closely related to the present one have been reported previously by Montgomery, Ramse...

Another Look at Norris and Ortega ( 2000 )

Since Norris and Ortega‟s (2000) seminal work on the effectiveness of second language instruction, there has been a proliferation of meta-analyses in the field of applied linguistics. Subsequent meta-analysts, however, have uncritically followed the methodological choices made by Norris and Ortega. This paper suggests a critical reevaluation of the methodological procedures underlying the Norri...

Mark Norris Lance and Philip Kremer

'Entailment' can be said in many ways. In the present paper, we sketch a linguistic theory which motivates taking 'A entails B' to mean 'commitment to A is, in part, commitment to B', and we present four formal systems designed to capture this concept. These four systems turn out (somewhat surprisingly) to be the strict implicational fragments of the modal logics K, T, K4, and $4 (see Hughes an...