CO 2 ‐Blick

Ein Blick in die Praxis: Das sagen Studierende der VWL

Schreiben fällt einer Studie von Dittmann et al. zufolge über 80 Prozent aller Studierenden schwer (Dittmann et al. 2003: 166-168). Knapp 22 Prozent der Befragten hätten deshalb ihre Hausarbeit nicht fertig geschrieben. Doch wie sieht es in der VWL aus? Die folgenden Einschätzungen und Aussagen von Studierenden geben einen Einblick in die größten Herausforderungen, die VWL-Studierende beim wiss...

Die deutsche UMTS-Auktion: Blick zurück im Zorn?

Photodesorption of ices I : CO , N 2 and CO 2

Context. A long-standing problem in astrochemistry is how molecules can be maintained in the gas phase in dense interand circum-stellar regions. Photodesorption is a non-thermal desorption mechanism, which may explain the small amounts of observed cold gas in cloud cores and disk mid-planes. Aims. The aim is to determine the UV photodesorption yields and to constrain the photodesorption mechani...

Co-ordering and Type 2 co-ordering

In [arXiv:1006.4939] the enumeration order reducibility is defined on natural numbers. For a c.e. set A, [A] denoted the class of all subsets of natural numbers which are co-order with A. In definition 5 we redefine co-ordering for rational numbers. One of the main questions there, was:"For a specific c.e. set A, consider set of all enumerations of it which is generated by some Turing machine {...

Crystal structure of [Co(NH3)6][Co(CO)4]2

Hexaamminecobalt(II) bis-[tetra-carbonyl-cobaltate(-I)], [Co(NH3)6][Co(CO)4]2, was synthesized by reaction of liquid ammonia with Co2(CO)8. The Co(II) atom is coordinated by six ammine ligands. The resulting polyhedron, the hexa-amminecobalt(II) cation, exhibits point group symmetry -3. The Co(-I) atom is coordinated by four carbonyl ligands, leading to a tetra-carbonyl-cobaltate(-I) anion in t...