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Subsequent to a comparative examination of recent bone material the author has recently completed the paleobiogeochemical evaluation of classical Quaternary and Pliocene terrestrial fossils of vertebrata from Hungary. A derivatograph (MOM) has been used to determine two thermoanalytical parameters which are closely associated with the passage of geological time: the total bound organic-matter content of the fossil and the fossilization cofficient.
Abstract
HDPE based composites were produced with 10-20-30 and 40% composite mass of wood fiber. The coupling agents were epolene and silane. The thermal behavior of composite samples was analyzed as a function of the coupling agent content, the exposure time and the wood fibers content by means of differential scanning calorimetry. Calorimetric curves of all samples of first and second heating shows a similar behavior. Some significant relation has been observed between the exposure time and the degree of crystallinity for the same percentage of fiber samples. A linear relation between the melting enthalpy average vs. content in cellulosic fibers is detected. Nevertheless, the fibers non-pretreated with coupling agent show a lower loss of crystallinity of the HDPE matrix at low wood fiber content (10%). A slight diminution of the melting peak temperature is detected as increasing the exposure time.
Abstract
Roman ancient mortars have been widely studied, in connection with both diagnosis and application required for restoring. Thermoanalytical experiments performed on mortars from Pompeii and Herculaneum provided a very good understanding of the technology employed. The mortars from Pompeii were obtained by the proper mixing of lime and marble grains while mortars of Herculaneum by lime and silicates compounds. The position of the endothermic peak of calcite decomposition showed important variations in the different samples studied, which was assigned to the different crystallinity and particle sizes. Experiments under CO2 flow confirmed the presence of magnesium calcium carbonates.
Abstract
The advances made in electronic dissemination of nuclear structure and decay data are described.
-00061). MAP concerned with the analysis of historical parchments and pointed towards the necessity of accelerated ageing studies. This was then developed in IDAP and damage assessment techniques for macro-, micro-, meso-, nanoscopic and molecular levels of
Abstract
Laser microprobe mass spectrometry (LMMS) detection limits for mercury have been determined using mercury-doped Spurr's tissue embedding medium. Actual mercury concentrations were confirmed via INAA. Procedures have also been developed to measure lithium and indium concentrations in thin films of polymerized Spurr's samples via PIGE and PIXE. These elements are currently being investigated as laser power density internal standards in the analysis of human tissue for studies of trace element involvement in neurological diseases.
Abstract
Fission track dating was used to determine the ultimate rock-forming epoch of Mahanshan Group of metamorphic rocks and involved granitite in NW China. The quartz and hornblende fission tracks revealed that Mahanshan metamorphic rocks were formed during 3.66-3.56.108 years before. Xiaoshima granitite rock body was dated 3.30-3.41.108 years which present the migmatization time in Mahan Shan Mountains area. Geological and geographical features indicate that the latter regional geological process should be dominated with physical tectonic activities including uplifting and fracturing.
