Results 131 to 140 of about 68,132 (365)

Nueva información palinológica sobre la Formación Poti (Viseano superior) en el arroyo Roncador, Cuenca Parnaíba, noreste de Brasil [PDF]

open access: yes, 2014
Se presenta el resultado del análisis palinológico de seis muestras de superficie de la Formación Poti expuesta en el arroyo Roncador (Jerumenha, Piauí), noreste de Brasil.
Di Pasquo Lartigue, Maria, Iannuzzi, R.
core   +1 more source

The Upper Palaeozoic pebbly mudstone facies of peninsular Thailand and western Malaysia - Continental margin deposits of Palaeoeurasia [PDF]

open access: yes, 1986
Die devonische bis unterpermlsche Phuket Group in Thailand und deren Äquivalent in Malaysia, die Singha Formation, gehören zum SE-asiatischen "pebbly mudstone Gürtel", welcher sich vom südlichen Tibet bis Sumatra erstreckt. Diese ca.
Altermann, Wladyslaw
core   +1 more source

Numerical Studies of Influencing Factors on the Homogeneity of the Powder Mixture during the Powder Spreading Process of Powder Bed Fusion–Laser Beam/Metal

open access: yesAdvanced Engineering Materials, EarlyView.
AISI 304L stainless steel powder is mixed with silicon nitride (Si3N4) powder and processed by PBF‐LB/M, allowing partial retention of Si3N4. The numerical approach effectively predicts the Si3N4 powder homogeneity and N content distribution on the powder bed. Recent studies have focused on the alloying of nitrogen (N) in high‐alloy stainless steels by
Yuanbin Deng   +7 more
wiley   +1 more source

Carboniferous algaflora in the Urals and its stratigrafical meaning

open access: yesЛитосфера, 2016
In the Urals Carboniferous 11 algae zones allowing to make interregional and intercontinental correlation of coeval deposits are established by author. For more fractional dividing of carbonate profiles on algoflora for the first time akmezones have been
R. M. Ivanova
doaj  

Tomographic Reconstruction of Carboniferous Arthropods

open access: yes, 2011
Carboniferous fossils are often found as three-dimensional voids within siderite (FeCO3) nodules. Traditional techniques of study – splitting the host concretion and inspecting the surfaces revealed – do not allow the investigation of morphology within the part / counterpart, and prevent complete data recovery. X-ray micro-tomography (XMT) and 'virtual
Garwood, Russell, Garwood, Russell
openaire   +5 more sources

II.—Notes on Carboniferous Mollusca [PDF]

open access: yesGeological Magazine, 1876
Specific Chars.—Polyzoarium composed of small cylindrical stems occupied by oval to hexagonal cells arranged usually in quincunx; or in oblique ascending lines; periphery of the cells erect, sharp, and granular; granules minute, numerous, and closely arranged.
openaire   +4 more sources

Hydrogel‐Based Capacitive Sensor Model for Ammonium Monitoring in Aquaculture

open access: yesAdvanced Engineering Materials, EarlyView.
Traditional techniques for monitoring aquaculture water quality, particularly ammonium levels, harm fish. This work presents a novel capacitive sensor with an ionic hydrogel transducer to monitor ammonium concentration in real time based on the ammonium‐induced hydrogel dissociation and osmotic pressure. Monitoring aquaculture water quality, especially
Mohammad Mirzaee   +3 more
wiley   +1 more source

Carboniferous Glaciation in Gondwanaland [PDF]

open access: yesGeological Magazine, 1963
Refutes interpretations by M. M. Anderson of earlier statements on early Carboniferous glaciation in Ghana and northern Brazil and reiterates the conclusion that it would have been only peripheral to the great glaciation in Gondwanaland.
openaire   +2 more sources

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