نتایج جستجو برای: geological context

تعداد نتایج: 449057  

2016

Teach the Earth: The Science Education Resource Center (SERC) Portal for Geoscience Faculty (Carleton College). This portal is the gateway to thousands of pages of activities, workshops, course descriptions and more http://serc.carleton.edu/teachearth/index.html [1] See the SERC site Bringing Research on Learning to the Geosciences for a searchable database of articles on effective learning and...

2009
Sildomar T. Monteiro Fabio Ramos

This paper investigates an approach that combines ensemble methods with graphical models to analyse multiple sensor measurements in the context of mine automation. Drill sensor measurements used for drilling automation have the potential to provide an estimate of the subsurface geological properties of the rocks being drilled. A Boosting algorithm is used as a local classifier mapping drill mea...

2001
D. A. FREEDMAN P. B. STARK

What is the chance that an earthquake of magnitude 6.7 or greater will occur before the year 2030 in the San Francisco Bay Area? The U.S. Geological Survey estimated the chance to be 0.7 ± 0.1 (USGS, 1999). In this paper, we try to interpret such probabilities. Making sense of earthquake forecasts is surprisingly difficult. In part, this is because the forecasts are based on a complicated mixtu...

2013
J. Tyler Faith Christian A. Tryon Daniel J. Peppe David L. Fox

Aim Within the last several decades, Grévy’s zebra (Equus grevyi) has undergone a massive reduction in geographical range and population size, largely as the result of human impacts. To place its recent decline in a deeper prehistoric context, and to understand the factors mediating its range and abundance over geological time frames, this study examines the fossil history of Grévy’s zebra in e...

2002
A. Sinclair

Lead isotopic data for galena-bearing deposits and showings in the southern end of the Coast Crystallin,e Belt have been discussed in a regional context by Godwin, et a/. (1980) as part of an evaluation of lead isotopic data in Bctish Columbia. Here we consider in more detail the geological implications of the!;e data. General characteristics of the mineral deposits in question are summarized i...

Journal: :Computers & Geosciences 2012
Xiaogang Ma Emmanuel John M. Carranza Chonglong Wu Freek D. van der Meer

Geological maps are increasingly published and shared online, whereas tools and services supporting information retrieval and knowledge discovery are underdeveloped. In this study, we developed an ontology of geological time scale by using a RDF (Resource Description Framework) model to represent the ordinal hierarchical structure of the geological time scale and to encode collected annotations...

2014
LV Xikui ZHou Xiaoping

The regional engineering geological conditions and geological hazard evaluation is the important part of realizing the railway geological selection, However, the accuracy of the evaluation largely depends on the reliability of basic information and reasonable mathematical model. Remote sensing provides reliable geological information and accurately reflects the geological conditions along the r...

Journal: :JSW 2014
Zhangang Wang Zixing Wu Honggang Qu Yongbo Zhang

A wide range of methodologies and software applications have been developed to generate 3-Dimensional (3D) geological model data. One of the main open issues is the exchange of these heterogeneous data from different sources, which influences the sharing and integration of 3D geodata. It is also a necessity to take into consideration the semantics of 3D geological data to enable its full exchan...

Journal: :Collegium antropologicum 2004
Roberto Macchiarelli Luca Bondioli Dean Falk Peter Faupl Bernard Illerhaus Ottmar Kullmer Wolfram Richter Hasen Said Oliver Sandrock Katrin Schäfer Christoph Urbanek Bence T Viola Gerhard W Weber Horst Seidler

A fossil hominid tooth was discovered during survey at Galili, Somali region, Ethiopia. The geological and faunal context indicate an Early Pliocene age. The specimen (GLL 33) consists of an almost complete lower right third molar likely representing a male individual of advanced age-at-death. Its comparative metrical, morphological and (micro)structural analysis (supported by a microtomographi...

Journal: :Molecular ecology 2004
Anne D Yoder Ziheng Yang

The lemurs of Madagascar are a unique radiation of primates that show an extraordinary diversity of lifestyles, morphologies and behaviours. However, very little is known about the relative antiquity of lemuriform clades due to the lack of terrestrial fossils for the Tertiary of Madagascar. Here, we employ a Bayesian method to estimate divergence dates within the lemuriform radiation using seve...

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