Results 101 to 110 of about 9,629,822 (348)

Geological, geochemical and mineralogical characteristics of REE-bearing Las Mercedes bauxite deposit, Dominican Republic

, 2017
Bauxite deposits, traditionally the main source of aluminum, have been recently targeted for their remarkable contents in rare earth elements (REE). With ∑REE (lanthanoids + Sc + Y) concentrations systematically higher than ∼1400 ppm (av.
L. Torró, J. Proenza, T. Aiglsperger, T. Bover‐Arnal, C. Villanova-de-Benavent, D. Rodríguez-García, A. Ramírez, J. Rodríguez, L. Mosquea, R. Salas   +9 more
semanticscholar   +1 more source

Resonance‐induced restoration of rock permeability degraded by heavy components of crude oil

Deep Underground Science and Engineering, EarlyView.
Resonance‐induced changes occur in filtration properties of sedimentary rocks in crude paraffin oil flow under acoustic vibrations. Experimental data on (a) pressure drop; (b) permeability; (c) pressure at the rock inlet; and (d) pressure at the rock outlet are presented.
Evgenii Riabokon, Qian Yin, Mikhail Guzev, Mikhail Turbakov, Evgenii Kozhevnikov, Nadezhda Riabokon, Ivan Panteleev   +6 more
wiley   +1 more source

Mineralogical Characteristics and Colouration Mechanism of Blue Opals from Peru

Yankuang ceshi, 2017
In recent years, the study of blue opal has been limited to the mineral composition and coloration mechanism. However, the chemical composition, infrared spectrum, and Raman spectrum of the blue opal have not been studied in details.
XING Ying-ying, QI Li-jian, WANG Hai-tao
doaj   +1 more source

Remote Stratigraphic Analysis: Combined TM and AIS Results in the Wind River/bighorn Basin Area, Wyoming [PDF]

, 1985
An in-progress study demonstrates the utility of airborne imaging spectrometer (AIS) data for unraveling the stratigraphic evolution of a North American, western interior foreland basin.
Adams, S., Lang, H. R., Paylor, E. D.
core   +1 more source

Rockburst prediction based on data preprocessing and hyperband‐RNN‐DNN

Deep Underground Science and Engineering, EarlyView.
A data preprocessing workflow is proposed to address challenges in rockburst data analysis. Coupled algorithms preprocess the data set, and hyperband optimization is used to enhance RNN performance. Results show that preprocessing improves accuracy, while dense layers enhance model stability and prediction performance.
Yong Fan, Chenxi Yin, Guangdong Yang, Shengyong Ding, Bin Tian   +4 more
wiley   +1 more source

Magneto-mineralogical characteristics, classification and use of natural magnetic sands

Геофизический журнал, 2011
Magnetic sands are a new object of studies due to possibility of their utilization in many branches of national economy. Experimental magneto-mineralogical studies have been performed for the samples of sand from the Black Sea region, Russia and Egypt ...
Yu. A. Kurnikov, M. I. Orlyuk
doaj   +1 more source

First mineralogical maps of 4 Vesta [PDF]

, 2012
Before Dawn arrived at 4 Vesta only very low spatial resolution (~50 km) albedo and color maps were available from HST data. Also ground-based color and spectroscopic data were utilized as a first attempt to map Vesta’s mineralogical diversity [1-4]. The
Ammannito, E., Barucci, M. A., Blewett, D., Capaccioni, F., Capria, M. T., Combe, J. P., De Sanctis, Maria Cristina, Denevi, B., Frigen, A., Jaumann, Ralf, Keller, H. U., Le Corre, L., Li, J. Y., Marchi, S., McCord, T. B., McFadden, L.A., McSween, H.Y., Nathues, A., Palomba, E., Pieters, Carle M., Raymond, C.A., Reddy, V., Russell, C.T., Stephan, K., Sunshine, J.M., Toplis, M., Tosi, Nicola, Yingst, A., Zambon, A.   +28 more
core  

Creep properties and constitutive model of diabase in deep water conveyance tunnels

Deep Underground Science and Engineering, EarlyView.
The axial and lateral creep characteristics of diabase were analyzed based on compression creep tests. The nonlinear viscoelastic‐plastic model capable of describing the whole creep process was established based on the fractional derivative and damage theories.
Zhigang Tao, Pengxiao Guan, Xiaojie Yang, Keyuan Liu, Mingjiu Cai, Hong Yang   +5 more
wiley   +1 more source

Study of Mortars Made with Natural and Artificial Pozzolans [PDF]

, 2019
The objective of this work is to evaluate the thermal activation potential of clay soils, particularly the clay fraction of dam mud, for the production of artificial pozzolan which can be substituted to cement in concrete and mortars applications and ...
BENAZZOUK, Amar, LAOUFI, Imene, LAOUFI, Laïd, SENHADJI, Yassine   +3 more
core  

The metagenomics of biosilicification: causes and effects [PDF]

, 2008
In order to determine the links between geochemical parameters controlling the formation of silica sinter in hot springs and their associated microbial diversity, a detailed characterisation of the waters and of in situ-grown silica sinters was combined ...
D. J. Tobler, Her, Hjorleifsdottir, L. G. Benning   +3 more
core   +2 more sources