Novel integrated approaches for predicting the compressibility of clay using cascade forward neural networks optimized by swarm- and evolution-based algorithms     

He  Ziguang  Nguyen  Hoang  Vu  Thai Ha  Zhou  Jian  Asteris  Panagiotis G.  Mammou  Anna 《Acta Geotechnica》2022,17(4):1257-1272

Acta Geotechnica - Soft soils are considered as disadvantages in construction, especially in clay layers. It requires many advanced techniques to treat the soft soils before construction, aiming to...  相似文献   

Fast large-scale reionization simulations     

Rajat M. Thomas  Saleem Zaroubi  Benedetta Ciardi  reas H. Pawlik  Panagiotis Labropoulos  Vibor Jeli&#;  Gianni Bernardi  Michiel A. Brentjens  A. G. de Bruyn  Geraint J. A. Harker  Leon V. E. Koopmans  Garrelt Mellema  V. N. Pandey  Joop Schaye  Sarod Yatawatta 《Monthly notices of the Royal Astronomical Society》2009,393(1):32-48

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Non-parametric foreground subtraction for 21-cm epoch of reionization experiments     

Geraint Harker  Saleem Zaroubi  Gianni Bernardi  Michiel A. Brentjens  A. G. de Bruyn  Benedetta Ciardi  Vibor Jeli&#;  Leon V. E. Koopmans  Panagiotis Labropoulos  Garrelt Mellema  ré Offringa  V. N. Pandey  Joop Schaye  Rajat M. Thomas  Sarod Yatawatta 《Monthly notices of the Royal Astronomical Society》2009,397(2):1138-1152

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THE DETERMINATION OF FLUORINE BY PROTON INDUCED GAMMA RAY EMISSION SPECTROMETRY (PIGE) IN EIGHTEEN CHINESE STANDARD REFERENCE SAMPLES OF STREAM SEDIMENTS, SOILS AND ROCKS: GSD 9-12, GSS 1-8 AND GSR 1-6     

Iwan ROELANDTS  Guy ROBAYE  Panagiotis ALOUPOGIANNIS  Georges WEBER  Jeanne-Marie DELBROUCK-HABARU 《Geostandards and Geoanalytical Research》1987,11(1):79-80

Eighteen new Chinese standard reference samples (including stream sediments, soils and rocks) have been analysed by an automated proton induced gamma ray emission (PIGE) method for fluorine. Results of determinations are reported and are generally in good agreement with the "usable values" previously published.  相似文献   

Enumeration of Cryptosporidium sp. and Giardia sp. (oo)cysts in a tropical eutrophic lake     

G. Ajeagah M.Sc  DEA  Ph.D.  T. Njine  S. Foto  C. F. Bilong Bilong  P. Karanis Ph.D. 《International Journal of Environmental Science and Technology》2007,4(2):223-232

The biodynamic of Cryptosporidium sp. oocysts and Giadia sp. cysts have been assessed in the municipal lake of Yaounde, which is an artificial eutrophic lake that has been constructed on the Mingoa stream of the Mfoundi River Basin of Cameroon. The oocysts were identified by the Ziehl-Neelsen method while the cysts were identified by the Lugol iodine coloration. The values obtained suggest an increase in (oo)cysts density from the surface to the bottom of the lentic ecosystem. The oocysts varied from 56 oocysts/L in the upper layer to 2640 oocysts/L of water in the lowest layer, while the cysts population dynamics ranged from 24 cysts/L at the surface layer of the lake to 1713 cysts/L at the lowest layers of the lake. There was a considerable reduction in the resistant forms of these emerging pathogenic protozoa between the surface water of the Mingoa stream entering the Lake and that coming out from the Lake. The highest value of Cyptosporidium oocysts determined at the entrance of the lake is 1480 oocysts/L while at the outlet the highest value of oocysts identified is 620 oocysts/L. The highest value of Giardia cysts determined at the entrance of the lake is 352 cysts/L while at the outlet the highest value recorded is 294 cysts/L.  相似文献   

Identification of lime plaster in prehistory using petrographic methods: A review and reconsideration of the data on the basis of experimental and case studies     

Panagiotis Karkanas 《Geoarchaeology》2007,22(7):775-796

Most prehistoric plasters and mortars consist of very small amounts of burnt lime mixed with anthropogenic debris, soil, and sediment. To solve the problem of identification of such small amounts of lime in impure lime plasters, a series of experimental plasters were prepared and studied with petrographic methods. Samples of living floors from five prehistoric sites in Greece were also reanalyzed under the light of the experimental findings and compared with natural calcareous sediment. The most promising features for identifying lime are transitional textures of partially carbonized slaked lime that can be observed in the lime lumps and the binding matrix. They are usually in the form of ill‐crystallized portlandite and calcite mixtures or cryptocrystalline calcite. Well‐reacted calcitic groundmass, shrinkage fractures, and occasionally colloidal forms are also additional indications. The present experimental study shows that lime could be easily produced by heating porous, soft calcareous materials. This would probably account for the very frequent use (in small quantities) of lime in Greek prehistory. Plaster and mortars were made by mixing damp anthopogenic dirt as aggregate and fragments of quicklime, a technique known as “hot mixing.” © 2007 Wiley Periodicals, Inc.  相似文献   

Erratum to: A cervelleite-like mineral and other Ag-Cu-Te-S minerals [Ag2CuTeS and (Ag,Cu)2TeS] in gold-bearing veins in metamorphic rocks of the Cycladic Blueschist Unit, Kallianou, Evia Island, Greece     

Panagiotis Christos Voudouris  Paul G. Spry  Gregory Aarne Sakellaris  Constantinos Mavrogonatos 《Mineralogy and Petrology》2011,103(1-4):179-179

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Is the Palea Kavala Bi–Te–Pb–Sb ± Au district, northeastern Greece, an intrusion-related system?     

Andrew P. Fornadel  Paul G. Spry  Vasilios Melfos  Michael Vavelidis  Panagiotis Ch. Voudouris 《Ore Geology Reviews》2011,39(3):119-133

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Conditions of formation of the Mavrokoryfi high-sulfidation epithermal Cu�CAg�CAu�CTe mineralization (Petrota Graben, NE Greece)     

Panagiotis Christos Voudouris 《Mineralogy and Petrology》2011,101(1-2):97-113

The Mavrokoryfi Cu?CAg?CAu?CTe prospect, northeastern Greece, consists of atypical, high-sulfidation mineralization where precious metals were introduced contemporaneously with advanced argillic alteration from magmatic vapors. It occurs as veins of massive sulfides in zones of silicic and advanced argillic alteration spatially associated with an andesitic lava dome and hyaloclastites. Mineralogical data demonstrate an unusual ore and gangue mineralogy that is compatible with formation under very oxidizing conditions (logfO₂ values of >?31.8) at temperatures of 200°C to 250°C. Oxidizing conditions favored the formation of hypogene lead sulfates (anglesite and barian celestite) instead of galena. Selenian acanthite, cadmian freibergite, and argentian goldfieldite are the main carriers of silver in the deposit and are reported in Greece for the first time. They were deposited at logfS₂ of ?9 to ?7 and logfTe₂ values of ?9 to ?12.5 (250°C). Ag-poor goldfieldite at Mavrokoryfi has up to 3.7 apfu Te and is the most Te-rich goldfieldite yet reported. The mineralization is accompanied by aluminum?Cphosphate?Csulfate minerals of magmatic-hydrothermal origin and an unusual Pb-enrichment. Ore-forming components were likely derived from andesite porphyries.  相似文献   

Consistency of seven different GNSS global ionospheric mapping techniques during one solar cycle   总被引：1，自引：0，他引：1  

David Roma-Dollase  Manuel Hernández-Pajares  Andrzej Krankowski  Kacper Kotulak  Reza Ghoddousi-Fard  Yunbin Yuan  Zishen Li  Hongping Zhang  Chuang Shi  Cheng Wang  Joachim Feltens  Panagiotis Vergados  Attila Komjathy  Stefan Schaer  Alberto García-Rigo  José M. Gómez-Cama 《Journal of Geodesy》2018,92(6):691-706

In the context of the International GNSS Service (IGS), several IGS Ionosphere Associated Analysis Centers have developed different techniques to provide global ionospheric maps (GIMs) of vertical total electron content (VTEC) since 1998. In this paper we present a comparison of the performances of all the GIMs created in the frame of IGS. Indeed we compare the classical ones (for the ionospheric analysis centers CODE, ESA/ESOC, JPL and UPC) with the new ones (NRCAN, CAS, WHU). To assess the quality of them in fair and completely independent ways, two assessment methods are used: a direct comparison to altimeter data (VTEC-altimeter) and to the difference of slant total electron content (STEC) observed in independent ground reference stations (dSTEC-GPS). The main conclusion of this study, performed during one solar cycle, is the consistency of the results between so many different GIM techniques and implementations.  相似文献