نتایج جستجو برای: dental deposits
تعداد نتایج: 189075 فیلتر نتایج به سال:
The 26th December 2004 Indian Ocean Tsunami (IOT) emanated from an Mw 9.2 earthquake that generated a 1600 km-long rupture along the Sumatran Megathrust and generated tsunami waves up to 30 m high. The IOT directly impacted the Bay of Bengal and east Africa, with over 283,000 people perishing. At the time, this catastrophic event was considered unprecedented and sparked intense investigations t...
Category 1 – General Domain This is a system in the geology domain. Main General Function PROSPECTOR is an expert system designed for decision-making problems in mineral exploration. It aids geologists in evaluating the favorability of an exploration site or region for occurrences of ore deposits of particular types. Once a site has been identified, PROSPECTOR can also be used for drilling-site...
From its Icelandic origins in the study of visible tephra horizons, tephrochronology took a remarkable step in the late 1980 s with the discovery of a ca. 4300-year-old microscopic ash layer in a Scottish peat bog. Since then, the search for these cryptotephra deposits in distal areas has gone from strength to strength. Indeed, a recent discovery demonstrates how a few fine-grained glass shards...
Geology of this area is ranging from Precambrian age for the rocks of granite, gneisses, schist and quartzite rocks, to recent age overlain by thick layers of alluvial deposits. This study aims to evaluate geological and structural influences on groundwater of Chamarajanagar taluk. It is an essential resource in outcrop and structures of the area, because of local field conditions, such as rock...
and principal rock types (colors). (a) Reflectance. Maturity trends in norite (red) and mare (green) are indicated by solid (fresh), dashed (intermediate), and dotted (degraded) lines. (b) Scaled reflectance (same spectra as a). Spectra have been scaled (multiplicative) to unity at 750 nm. This scheme emphasizes trends in band strength and shape, which are apparent for all three suites of spect...
Marked changes in human dispersal and development during the Middle to Upper Paleolithic transition have been attributed to massive volcanic eruption and/or severe climatic deterioration. We test this concept using records of volcanic ash layers of the Campanian Ignimbrite eruption dated to ca. 40,000 y ago (40 ka B.P.). The distribution of the Campanian Ignimbrite has been enhanced by the disc...
We present new observations of pyroclastic deposits on the surface of Mercury from data acquired during the orbital phase of the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission. The global analysis of pyroclastic deposits brings the total number of such identified features from 40 to 51. Some 90% of pyroclastic deposits are found within impact craters. The loca...
High-accuracy age estimations of tsunami deposits are very important for tsunami deposit research because the recurrence interval and frequency of tsunami deposits allow us to assess the devastating impacts of tsunamis in a populated country such as Japan. The correlation of tsunami events between remote coastal areas further enables us to constrain tsunami scenarios and fault segmentation alon...
As documented by radiocarbon dating and geoarchaeological investigations, the now hyperarid northwestern Sudan and southwestern Egypt experienced a period of greater effective moisture during early and middle Holocene time, about 10-5 ka. We have used the uranium-series technique to date lacustrine carbonates from Bir Tarfawi, Bir Sahara East, Wadi Hussein, Oyo Depression, and the Great Selima ...
Introduction The application of recently developed research techniques to the study of tumour invasion and metastasis has uncovered new and surprising information which has focused increasing clinical and scientific interest on this aspect of neoplasia. The magnitude of the effect of this problem on health is revealed by reference to the annual mortality statistics published by the Registrar Ge...
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