Studies on Magnesium Silicates, “Steatite”, Part IV

In situ X-ray di¡raction studies of dense hydrous magnesium silicates at mantle conditions

Lizardite was pressurized up to about 28 and 20 GPa and heated at 1310 ( þ 50) and 1100 ( þ 100)3C; antigorite was pressurized at about 25 and 22 GPa and heated at V10003C, with a Nd:YAG laser using the double-side laser heating technique. Samples were then examined in situ by energy dispersive synchrotron X-ray diffraction. Our results show that phase E, superhydrous phase B, and phase D are i...

Epidemiological research methods. Part IV. Case-control studies.

Cases* Controlst Total instead, available lists (cancer registers, admissions to hospital, notifications or registered deaths) are used, but then one cannot be sure that all cases have been assembled-for example a list of hospital admissions for ischaemic heart disease or for traumatic brain injuries would exclude deaths before' admission as well as mild episodes either not treated or treated b...

Trace element studies on Karachi population. Part IV: Blood copper, zinc, magnesium and lead levels in psychiatric patients with depression, mental retardation and seizure disorders.

Blood copper, zinc, magnesium and lead levels were determined by atomic absorption spectroscopy for 15 males and 16 females suffering from depression, 6 males and 1 female with mental retardation and 3 males and 4 females with seizure disorders. They were all under no medication and belonged to low income groups. No difference in copper levels was found between the sexes in any of the groups. T...

Steps toward interstellar silicate mineralogy V. Thermal evolution of amorphous magnesium silicates and silica

The thermally induced amorphous-to-crystalline transition has been studied for bulk sheets and micrometre-sized particles of magnesium silicate glass (MgSiO3), nanometresized amorphous magnesium silicate (MgSiO3 and Mg2SiO4 smokes) and amorphous silica particles (SiO2). Silicate glass was produced by the shock-quenching of melts. Samples of nanometre-sized smoke particles have been obtained by ...

On an Inequality of Diananda - Part IV