Chemische Untersuchung der Himbeeren, Fructus Rubi Idaei

Synthese und Untersuchung der Lanthanoidoxidnitrate

The lanthanide oxide nitrates LnONO3 with Ln = Pr, Nd, and Sm-Yb were synthesised by thermal decomposition of hydrated lanthanide nitrates. The compounds were refined isotypically to YONO3 in the tetragonal space group P4/nmm and the structure is closely related to the PbFCl-type. Because of the orientational disorder of NO3− in this structure refinement a possible superstructure is discussed. ...

Empirische Untersuchung der agilen Softwareentwicklung

Untersuchung von HelpDesk-Systemen der Kommunikationsbranche

The fast availability of technical solutions is important to businesses facing problems occurred in the IT infrastructure. The removal of these problems can be ensured by means of helpdesk systems (labor organization). The helpdesk system is supported by independently operating IT systems such as trouble ticket systems, network management systems, and network documentation systems. The subject ...

Empirische Untersuchung der Designgeschichte des WWW

Im vorliegenden Beitrag wird eine empirische Studie vorgestellt, in der auf der Basis der im Internet Archive (Wayback Machine) verfügbaren historischen Fassungen von Websites strukturelle Entwicklungen im Website-Design nachgezeichnet werden. Dazu wird das von Ivory & Megraw 2005 vorgestellte Modell des Website-Designs adaptiert und auf eine Stichprobe von Websites großer ITUnternehmen angewan...

Elektronendichte und chemische Verschiebung der Styryldiazin- und Diazaphenanthrenprotonen

Proton chemical shifts in styryldiazines and diazaphenanthrenes linearly correlate with SCF-?relectron densities of the attached carbon atom and with the electron densities of the hydrogen atom (calculated by the CNDO/2 method). The observed deviations from linearity are discussed in terms of ring current effect, steric effects and the paramagnetic effect of the nitrogen lone pair electrons. An...