نتایج جستجو برای: mesozoic refractory sand

تعداد نتایج: 88414  

Journal: :MATEC web of conferences 2022

Binder Jetting is an Additive manufacturing (AM) technique in which binding liquid jetted on layers of powdered materials, selectively according to the Computer Aided Design (CAD) model form a 3D part. One applications binder jetting technology sand moulds for casting known as Rapid Sand Casting. Silica often used both Casting and traditional moulding due its good refractory properties coupled ...

2015
Thomas Hadlari Graeme T. Swindles Jennifer M. Galloway Kimberley M. Bell Kyle C. Sulphur Larry M. Heaman Luke P. Beranek Karen M. Fallas Axel K Schmitt

Detrital zircon studies are providing new insights on the evolution of sedimentary basins but the role of sedimentary recycling remains largely undefined. In a broad region of northwestern North America, this contribution traces the pathway of detrital zircon sand grains from Proterozoic sandstones through Phanerozoic strata and argues for multi-stage sedimentary recycling over more than a bill...

Journal: :Geology 2021

Abstract The terrestrial sedimentary record provides a valuable archive of how ancient depositional systems responded to and recorded changes in Earth's atmosphere, biosphere, geosphere. However, the these environmental eolian successions is poorly constrained largely unquantified. Our study presents first global-scale, quantitative investigation architecture through geological time via analysi...

2012
Zhuo Yan Georgiy V. Nikolajev Dong Ren

A new genus and species of fossil Glaphyridae, Cretohypna cristatagen. et sp. n., is described and illustrated from the Mesozoic Yixian Formation. This new genus is characterized by the large body; large and strong mandibles; short labrum; elytra without longitudinal carina; and male meso- and possible metatibia apically modified. A list of described fossil glaphyrids of the world is provided. ...

2016
Roger B. J. Benson Richard J. Butler John Alroy Philip D. Mannion Matthew T. Carrano Graeme T. Lloyd Anthony D. Barnosky

How did evolution generate the extraordinary diversity of vertebrates on land? Zero species are known prior to ~380 million years ago, and more than 30,000 are present today. An expansionist model suggests this was achieved by large and unbounded increases, leading to substantially greater diversity in the present than at any time in the geological past. This model contrasts starkly with empiri...

2016
Luis A. Buatois

The Mesozoic lacustrine revolution (MLR) represents a major evolutionary event in the continental realm (Cohen 2003 ). The decline in taxic diversity at the family level in lacustrine environments that took place during the late Paleozoic–Middle Triassic was reversed later in the Mesozoic, with diversifi cation seeming to have continued to the Quaternary, although potential biases may have affe...

Journal: :Current Biology 2015
Enrique Peñalver Antonio Arillo Ricardo Pérez-de la Fuente Mark L. Riccio Xavier Delclòs Eduardo Barrón David A. Grimaldi

The great evolutionary success of angiosperms has traditionally been explained, in part, by the partnership of these plants with insect pollinators. The main approach to understanding the origins of this pervasive relationship has been study of the pollinators of living cycads, gnetaleans, and basal angiosperms. Among the most morphologically specialized living pollinators are diverse, long-pro...

Journal: :Chemosphere 2015
G Xhixha M Baldoncini I Callegari T Colonna F Hasani F Mantovani F Shala V Strati M Xhixha Kaçeli

The Naturally Occurring Radioactive Materials (NORMs) that are potentially generated from oil and gas extractions in Albania have been disposed of without regulations for many decades, and therefore, an extensive survey in one of the most productive regions (Vlora-Elbasan) was performed. A total of 52 gamma ray spectrometry measurements of soil, oil-sand, sludge, produced water and crude oil sa...

2002
Robert Hardy

The Sheep Creek camp straddles the eastern boundary o' the Kootenay arc. This arcuate belt of deformed and meta morphosed rocks has had a complex history of Mesozoic ant1 Paleocene compressional and transpressional defo!nnatiol~ overprinted by Eocene extensional tectonics. The rocks an: believed to represent both a distal continental margin and part of a late Paleozoic to early Mesozoic back-ar...

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