Experimental investigation of the reactions 25 Mg(alpha,n)28 Si, 26 Mg(alpha,n)29 Si, 18 O(alpha,n)21 Ne and their impact on stellar nucleosynthesis

In der vorliegenden Dissertation werden die Kernreaktionen 25Mg(alpha,n)28Si, 26Mg(alpha,n)29Si und 18O(alpha,n)21Ne im astrophysikalisch interessanten Energiebereich von E alpha = 1000 keV bis E alpha = 2450 keV untersucht.rnrnDie Experimente wurden am Nuclear Structure Laboratory der University of Notre Dame (USA) mit dem vor Ort befindlichen Van-de-Graaff Beschleuniger KN durchgeführt. Hierbei wurden Festkörpertargets mit evaporiertem Magnesium oder anodisiertem Sauerstoff mit alpha-Teilchen beschossen und die freigesetzten Neutronen untersucht. Zum Nachweis der freigesetzten Neutronen wurde mit Hilfe von Computersimulationen ein Neutrondetektor basierend auf rn3He-Zählrohren konstruiert. Weiterhin wurden aufgrund des verstärkten Auftretens von Hintergrundreaktionen verschiedene Methoden zur Datenanalyse angewendet.rnrnAbschliessend wird mit Hilfe von Netzwerkrechnungen der Einfluss der Reaktionen 25Mg(alpha,n)28Si, 26Mg(alpha,n)29Si und 18O(alpha,n)21Ne auf die stellare Nukleosynthese untersucht.rn

Flora of Illinois, containing keys for identification of flowering plants and ferns.

no.7

A manual of the mosses of western Pennsylvania and adjacent regions.

no.6

The reptiles of Ohio.

no.5

Guanchias Limitada : a case study of an agrarian reform cooperative and its long-term relationship with a multinational firm in Honduras /

"PN-AAL-046"--Cover.

Democracy or anarchy? : A study of proportional representation /

Mode of access: Internet.

The Fifth Republic; [a political study of modern France.

Includes bibliography.

Notre-Dame du Perpétuel Secours : vierge miraculeuse vénérée dans l'église de Saint Alphonse, a Rome.

Mode of access: Internet.

Saint Bernward of Hildesheim,

v.1. His life and times.--v.2. His works of art. Bibliography (p. 453-486).--v.3. Album.

Titles of literature concerning the fixation of free nitrogen by plants /

In v. 37 of a series of botanical tracts collected and bound together by Rev. Julius A. Nieuwland, University of Notre Dame.

Annual progress report to Office of Naval Research. Period of report: January 1, 1958 to December 31, 1958.

At head of title: Lobund Institute, University of Notre Dame, Notre Dame, Indiana.

Notre-Dame; oder, Die Liebfrauenkirche zu Paris : ein historischer Roman /

Translation of: Notre Dame de Paris.

Observations of a Catholic, occasioned by the First report of the managers of, the Kentucky Auxiliary, Bible Society.

Authorship attributed to Badin from letters in the University of Notre Dame archives of J.B. David to S.W. Bruté dated June 9, 1817 and July 20, 1817.

An illustrated history of St. Joseph's Church, South Bend, Indiana.

Includes advertisements for local busineses.

Project-based organization as adaptation to risk and opportunity in small firms

Recent years have seen a rapid increase in SMEs working collaboratively in inter-organizational projects. But what drives the emergence of such projects, and what types of industries breed them the most? To address these questions, this paper extends the long running literature on the firm and industry antecedents of new venturing and alliance formation to the domain of project-based organization by SMEs. Based on survey data collected among 1,725 small and medium sized organizations and longitudinal industry data, we find an overall pattern that indicates that IOPV participation is primarily determined by a focal SME’s scope of innovative activities, and the munificence, dynamism and complexity of its environment. Unexpectedly, these variables have different effects on whether SMEs are likely to engage in IOPVs, compared to with how many there are in their portfolio at a time. Implications for theory development are discussed.