Rolf Johan Witting. 1879-1944

Selected Writings of Sir Arthur Hurst (1879–1944)

Selected Writings of Sir Arthur Hurst (1879-1944), ed. by THOMAS HUNT, London, British Society of Gastroenterology, 1970, pp. xiv, 218, illus., £2X00 (E1X50 to members of the Society). Hurst was probably the most original thinker of his contemporary physicians. Indomitable in the face of deafness and chronic asthma he was an iconoclast, destroying long-held beliefs based on flimsy foundations. ...

Urlaub , Rolf Backofen and Anita

Johan Petersson

This paper presents a tentative framework for understanding a particular environment of electronic commerce activities the local electronic marketplace. This type of marketplace is Internet-based and dedicated to consumer-oriented commerce. The framework consists of two main components: marketplace functions and marketplace practice. Viewing an electronic marketplace in this way means adopting ...

Martin Rosner Æ Rolf

The isotopic analysis of boron from material that carries only trace amounts of boron requires low boron blank levels. Large efforts are taken to keep blank levels low by purifying reagents. We performed exposure experiments and determined procedure blanks before and after the air-handling system was modified from silicate glass filters to polyethylene/polystyrole and active carbon filters. Our...

2 Rolf Niedermeier And

Notions of unambiguity for uniform circuits and AuxPDAs are studied and related to each other. In particular, a coincidence for counting and unambiguous versions of AuxPDAs and semi-unbounded fan-in circuits is shown. Moreover, an improved simulation of LOGUCFL (the class of languages logspace many-one reducible to unambiguous context-free languages) by unambiguous circuits and AuxPDAs is devel...