TiAs2-type Phases

Earth Abundant Element Type I Clathrate Phases

Earth abundant element clathrate phases are of interest for a number of applications ranging from photovoltaics to thermoelectrics. Silicon-containing type I clathrate is a framework structure with the stoichiometry A8-xSi46 (A = guest atom such as alkali metal) that can be tuned by alloying and doping with other elements. The type I clathrate framework can be described as being composed of two...

Vortex - glass phases in type - II superconductors ∗

A review is given on the theory of vortex-glass phases in impure type-II superconductors in an external field. We begin with a brief discussion of the effects of thermal fluctuations on the spontaneously broken U (1) and translation symmetries, on the global phase diagram and on the critical behaviour. Introducing disorder we restrict ourselves to the experimentally most relevant case of weak u...

SN 1996N - A type Ib supernova at late phases

We present photometric and spectroscopic observations of the Type Ib supernova (SN Ib) 1996N in NGC 1398. The supernova has been observed at several occasions between 179 and 337 days after discovery. The light curves in V , R and I have decline rates of 1.67±0.23, 1.72±0.10 and 1.93±0.24 mag (100d)−1 respectively, substantially faster than the decay rate of 56Co. The late light curves of SN 19...

Geometric Phases

Phases beyond

It is agued that there is crosslinguistic variation regarding what counts as a phase in the traditional Noun Prase (TNP) which tracks independent crosslinguistic variation regarding the categorial status of the TNP assumed under the DP/NP parameter, on which languages without articles lack DP. In particular, it is argued that DP is a phase in DP languages, and NP is a phase in NP languages. How...