The Cwm Dulyn rhyolite, Snowdonia

A Data Quality Metamodel Extension to CWM

The importance of metadata has been broadly referred in the last years, mainly in the field of data warehousing and decision support systems. Contemporarily, in the adjacent field of data quality, several approaches and tools have been set out for the purpose of data profiling and cleaning. However, little effort has been made in order to formally specify metrics and techniques for data quality...

CWM global search - an internet search engine for the chemist

The Internet is a rich source of data and information for chemist. There are numerous multidisciplinary databases available for free on the Internet. Some examples of such data repositories are: PubChem, ChemSpider, eMolecules, Drugbank, KEGG, NIST, ChemSynthesis, PharmGKB, Free patents online ... It should be obvious that an end user is a) not aware of all the resources, and b) has not the tim...

Shock compression and isentropic release of rhyolite

Shock-wave equation of state of rhyolite

We have obtained new shock-wave equation of state (EOS) and release adiabat data for rhyolite. These data are combined with those of Swegle (1989, 1990) to give an experimental Hugoniot which is described by Us=2.53(±0.08)+3.393(±0.37)up for up<0.48 km s−1 , Us=3.85(±0.05)+0.65(±0.03)up for 0.48≤up<2.29 km s−1 , Us=1.52(±0.08)+1.67(±0.02)up for 2.29≤up<4.37 km s−1 , and Us=3.40(±034)+ 1.24(±0.0...

Thermodynamic and rheological properties of rhyolite and andesite melts

The heat capacities of a rhyolite and an andesite glass and liquid have been investigated from relativeenthalpy measurements made between 400 and 1800 K. For the glass phases, the experimental data agree with empirical models of calculation of the heat capacity. For the liquid phases, the agreement is less good owing to strong interactions between alkali metals and aluminum, which are not curre...