Bradley S. Van Gosen, Philip L. Verplanck, Poul Emsbo,
First posted April 11, 2019 Revised April 15, 2019 For additional information, contact: U.S. Geological Survey, Mineral Resources Program12201 Sunrise Valley Dr., MS–300Reston, VA 20192 Because of their unique special chemical properties, many of the metals in the group of rare earth elements (REEs) have essential applications in 21st century technologies. Examples of products that use REEs are cell phones, computers, fluorescent and light-emitting-diode lights, flat-screen television and computer ...
Tópico(s): Clay minerals and soil interactions
2019 - United States Geological Survey | U.S. Geological Survey circular/U.S. Geological Survey Circular
Bas van Genabeek, Bas F. M. de Waal, Mark M. J. Gosens, Louis M. Pitet, Anja R. A. Palmans, E. W. Meijer,
Most of the theoretical and computational descriptions of the phase behavior of block copolymers describe the chain ensembles of perfect and uniform polymers. In contrast, experimental studies on block copolymers always employ materials with disperse molecular makeup. Although most polymers are so-called monodisperse, they still have a molecular weight dispersity. Here, we describe the synthesis and properties of a series of discrete length diblock co-oligomers, based on oligo-dimethylsiloxane (oDMS) ...
Tópico(s): Polymer Surface Interaction Studies
2016 - American Chemical Society | Journal of the American Chemical Society
Vijay Mishra, Filip Du Prez, E. Gosen, E. J. Goethals, L. H. Sperling,
Abstract Any simultaneous interpenetrating network (SIN) synthesis contains three key events. These are gelation of polymer I, gelation of polymer II, and phase separation of polymer I from polymer II. Metastable phase diagrams of SINs are developed, in which the time occurrence of these three events is represented. A polyurethane/poly(methyl methacrylate) (PU/PMMA) system was chosen as a model. Polymerization kinetics were followed in situ for both PU and PMMA using Fourier Transform Infrared Spectroscopy ( ...
Tópico(s): Advanced Polymer Synthesis and Characterization
1995 - Wiley | Journal of Applied Polymer Science
José Augusto Berrocal, Florent Di Meo, Miguel Garcı́a-Iglesias, Ronald P. J. Gosens, E. W. Meijer, Mathieu Linares, Anja R. A. Palmans,
We report the synthesis and self-assembly of chiral, conformationally flexible C3-symmetrical trisamides. A strong Cotton effect is observed for the supramolecular polymers in linear alkanes but not in cyclic alkanes. MD simulations suggest 2 : 1 conformations of the amides within the aggregates in both types of solvents, but a chiral bias in only linear alkanes.
Tópico(s): Supramolecular Chemistry and Complexes
2016 - Royal Society of Chemistry | Chemical Communications
Timothy Ault, Bradley S. Van Gosen, Steven Krahn, A.G. Croff,
AbstractThis paper reviews the front end of the thorium fuel cycle, including the extent and variety of thorium deposits, the potential sources of thorium production, and the physical and chemical technologies required to isolate and purify thorium. Thorium is frequently found within rare earth element–bearing minerals that exist in diverse types of mineral deposits, often in conjunction with other minerals mined for their commercial value. It may be possible to recover substantial quantities of ...
Tópico(s): Nuclear materials and radiation effects
2016 - Taylor & Francis | Nuclear Technology
R. Helen Zha, Ghislaine Vantomme, José Augusto Berrocal, Ronald P. J. Gosens, Bas de Waal, Stefan C. J. Meskers, E. W. Meijer,
Abstract Materials with highly ordered molecular arrangements have the capacity to display unique properties derived from their nanoscale structure. Here, the synthesis and characterization of azobenzene (AZO)‐functionalized siloxane oligomers of discrete length that form photoswitchable supramolecular materials are described. Specifically, synergy between phase segregation and azobenzene crystallization leads to the self‐assembly of an exfoliated 2D crystal that becomes isotropic upon photoisomerization ...
Tópico(s): Polydiacetylene-based materials and applications
2017 - Wiley | Advanced Functional Materials
Matthew B. Baker, Ronald P. J. Gosens, Lorenzo Albertazzi, Nicholas M. Matsumoto, Anja R. A. Palmans, E. W. Meijer,
The formation of multicomponent and bioactive supramolecular polymers is a promising strategy for the formation of biomaterials that match the dynamic and responsive nature of biological systems. In order to fully realize the potential of this strategy, knowledge of the location and behavior of bioactive components within the system is crucial. By employing synthetic strategies to create multifunctional monomers, coupled with FRET and STORM techniques, we have investigated the formation and behavior ...
Tópico(s): Molecular Sensors and Ion Detection
2015 - Wiley | ChemBioChem
In the southwestern part of the Sierra de San Luis, clastic sediments of the Phyllite Group are assigned to the Late Precambrian–Early Cambrian interval and contain acid meta-mamatic dykes. Deposits of the Micaschist Group are interpreted as deeper crustal equivalents. Lower Ordovician intrusions of the Bemberg and Las Verbenas Tonalites, as well as the Lower Devonian La Escalerilla Granite pluton, led to a thermal overprint in the Phyllite Group. A first deformation, pegmatitic injections, and ...
Tópico(s): Geological and Geophysical Studies Worldwide
1998 - Elsevier BV | Journal of South American Earth Sciences
Structural analyses of the Phyllite and Micaschist Group with intercalated intrusions in the Sierra de San Luis (Sierras Pampeanas, western Argentina) reveal a multi-stage magmato-tectonic evolution during Early Paleozoic times. The Tamboreo Tonalite intruded the undeformed clastic sediments of both groups and led to the development of a contact aureole. The Paso del Rey Granite and associated pegmatite dikes are interpreted as pre-kinematic with respect to the first deformation of the micaschists. ...
Tópico(s): earthquake and tectonic studies
1998 - Elsevier BV | Journal of South American Earth Sciences
[1] In the Sierra Norte de Córdoba, Argentina, at the inferred western pre-Andean Gondwana margin, structural analyses show that Upper Proterozoic–Lower Cambrian strips of metamorphic clastic rocks underwent two stages of a compressive deformational history. The D1 deformation led to the formation of an S1 cleavage/foliation and affected an older granite. It is related to F1 folding around ∼N-S to NE-SW trending axes that partly record a steep plunge. Reconstructed fold structures display maximum ...
Tópico(s): Geological formations and processes
2010 - Wiley | Tectonics
Werner von Gosen, César Prozzi,
Tópico(s): Geological and Tectonic Studies in Latin America
2005 - E. Schweizerbart | Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
Abstract The Western Basement Complex of the Sierra de San Luis underwent a complex deformational and metamorphic history of presumed Proterozoic age. The Phyllite Group and equivalents consist of a thick clastic sequence, whose time of deposition is compared with that of the Late Precambrian-Early Cambrian Puncoviscana Formation. This is intruded by early Famatinian magmatic arc tonalites to granodiorites, whereas an eastern basement unit was affected by early Famatinian mafic/ultramafic intrusions, ...
Tópico(s): Geological formations and processes
1998 - Geological Society of London | Geological Society London Special Publications
Werner von Gosen, W. Loske, C. Prozzi,
U–Pb datings of zircons from intrusions in the metamorphic complex of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina) suggest that the depositional, tectonic, metamorphic, and magmatic history in this part of the Pampean Terrane spans the Proterozoic through Early Paleozoic time interval. The Paso del Rey Granite intruded a clastic succession at 608+26/−25 Ma and, afterward, was deformed together with the country rocks. The intrusions of the Rı́o Claro Granite and La Escalerilla Granite ...
Tópico(s): earthquake and tectonic studies
2002 - Elsevier BV | Journal of South American Earth Sciences
Bradley S. Van Gosen, Heather Lowers, Stephen J. Sutley,
Tópico(s): Clay minerals and soil interactions
2004 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Werner von Gosen, César Prozzi,
Tópico(s): Geochemistry and Geologic Mapping
2009 - E. Schweizerbart | Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
Werner von Gosen, William C. McClelland, W. Loske, Juan Cruz Martínez, C. Prozzi,
U-Pb zircon data (secondary ion mass spectrometry [SIMS] and thermal ionization mass spectrometry [TIMS] analyses) from igneous rocks with differing structural fabrics in the Sierra Norte de Córdoba, western Argentina, suggest that the sedimentary, tectonic, and magmatic history in this part of the Eastern Sierras Pampeanas spans the late Neoproterozoic–Early Cambrian. A deformed metarhyolite layer in metaclastic sedimentary rocks gives a crystallization age of 535 ± 5 Ma, providing a limit on the timing ...
Tópico(s): earthquake and tectonic studies
2014 - Geological Society of America | Lithosphere
Bradley S. Van Gosen, Richard B. Berg, Jane M. Hammarstrom,
For the last several years, Montana has been the leading talc producing state in the United States (U.S. Geological Survey, 1996). For example, in 1992 Montana supplied about 40 percent of the U.S. mine production of talc (Virta, 1992). All of this production has come from the large deposits of high purity talc in the southwestern part of the state. All Montana talc is currently (1997) extracted from four mines, each within the study area of this map—the open pit operations of the Treasure State, Regal, ...
Tópico(s): Geochemistry and Geologic Mapping
1998 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Werner von Gosen, Werner Buggisch, César Prozzi,
Tópico(s): Paleontology and Stratigraphy of Fossils
2009 - E. Schweizerbart | Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
Tyler L. Spano, Travis A. Olds, Susan M. Hall, Bradley S. Van Gosen, Anthony R. Kampf, Peter C. Burns, Joe Marty,
Abstract Finchite (IMA2017-052), Sr(UO2)2(V2O8)·5H2O, is the first uranium mineral known to contain essential Sr. The new mineral occurs as yellow-green blades up to ~10 µm in length in surface outcrops of the calcrete-type uranium deposit at Sulfur Springs Draw, Martin County, Texas, U.S.A. Crystals of finchite were subsequently discovered underground in the Pandora mine, La Sal, San Juan County, Utah, U.S.A., as diamond-shaped golden-yellow crystals reaching up to 1 mm. The crystal structure of ...
Tópico(s): Nuclear Materials and Properties
2022 - Mineralogical Society of America | American Mineralogist
Flemming R. Cassee, Hedwig M. Braakhuis, Margriet V. Park, Agnes G. Oomen, Ilse Gosens, Wim H. de Jong,
Tópico(s): Computational Drug Discovery Methods
2016 - Elsevier BV | Toxicology Letters
Jane M. Hammarstrom, Bradley S. Van Gosen,
Geochemical data on rocks associated with mineral occurrences provide signatures that aid in recognition of the types of mineral deposits that may be present in an area.They also indicate metals, minor elements, or trace elements that may be mobilized from rocks to soils or to waters as rocks are exposed to natural (weathering, landslides) or human-induced (surface disturbance such as road construction or mining) processes.As part of an ongoing study to provide federal land managers with a perspective ...
Tópico(s): Clay minerals and soil interactions
1998 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Myrte N. Gosen, Maaike Besselse, Kees de Glopper, Jan Berenst,
When children enter school at the age of four, they are expected to differ in their experience with reading-aloud of picture books and stories. Experience with reading-aloud influences their further development. Therefore, insight in the amount of experience with reading-aloud is useful. Until now, there was no measurement instrument available for children in the age range of 4 to 6 years old. This paper describes the development, design and measurement qualities of such an instrument. The reliability ...
Tópico(s): Child Development and Digital Technology
2009 - John Benjamins Publishing Company | Toegepaste Taalwetenschap in Artikelen
Jordi Minnema, Christiaan Delmaar, Ilse Gosens, Flemming R. Cassee, LS Tran, Bas Bokkers,
Tópico(s): Computational Drug Discovery Methods
2021 - Elsevier BV | Toxicology Letters
Ilse Gosens, Christiaan Delmaar, Wouter ter Burg, Jacqueline W.H. Biesterbos, Natalie von Goetz, Martine Bakker, Cees de Heer, Gerlienke Schuur,
Certified reference materials (CRMs) of water content are widely used in the calibration and validation of Karl Fischer coulometry and volumetry. In this study, the water content of the water saturated 1-octanol (WSO) CRM was certified by Karl Fischer coulometry, volumetry and quantitative nuclear magnetic resonance (Q NMR). The water content recovery by coulometry was 99.76% with a diaphragm-less electrode and Coulomat AG anolyte. The relative bias between the coulometry and volumetry results was ...
Tópico(s): Radioactive Decay and Measurement Techniques
2012 - Elsevier BV | Toxicology Letters
Structural analyses in the northeastern segment of the North Patagonian Massif (southern Argentina) show that the simply deformed and metamorphosed phyllitic succession of the Late Precambrian–Cambrian El Jagüelito Formation has been intruded by Ordovician granitoids that are not ductilely deformed. The unconformable cover of the Silurian–Lower Devonian Sierra Grande Formation suggests that the Early Paleozoic Famatinian deformation of western Argentina did not affect this sector of the North Patagonian ...
Tópico(s): Paleontology and Stratigraphy of Fossils
2002 - Elsevier BV | Journal of South American Earth Sciences
In the northeastern segment of the North Patagonian Massif (southern Argentina), S to SW directed thrusting affected a Late Proterozoic to Cambrian phyllite succession and the Silurian to Lower Devonian Sierra Grande formation. Thrust tectonics was partly combined with the formation of mylonites and followed by the intrusion of the Navarrete granodiorite. Mylonites of the Tardugno granitoids are attributed to a ductile shear horizon in the subsurface. As second stage of deformation after cessation ...
Tópico(s): Geological and Geophysical Studies Worldwide
2003 - Wiley | Tectonics
Werner von Gosen, Karsten Piepjohn,
Besides the ∼W‐E trending Kap Cannon Thrust Zone and Harder Fjord Fault Zone, the 300 km long and NW‐SE striking Wandel Hav Mobile Belt represents the third major fault zone in north Greenland. Structural analyses in several areas of this belt suggest that compressive deformation is characterized by transpressive dextral strike‐slip kinematics. This is demonstrated by a combination of folding around ∼W‐E axes, approximately north and south directed reverse faulting, and dextral strike‐slip displacements ...
Tópico(s): High-pressure geophysics and materials
2003 - Wiley | Tectonics
Claudia Beatriz Zaffarana, Mónica G. López de Luchi, Rubén Somoza, R. C. Mercader, Raúl Eduardo Giacosa, R. Martino,
... The results mostly agree with the findings von Gosen and Loske (2004) in that rocks spatially and ...
Tópico(s): Geology and Paleoclimatology Research
2010 - Elsevier BV | Journal of South American Earth Sciences
Flemming R. Cassee, Arezoo Campbell, A. John F. Boere, Steven G. McLean, Rodger Duffin, Petra Krystek, Ilse Gosens, Mark R. Miller,
Cerium oxide (CeO2) nanoparticles improve the burning efficiency of fuel, however, little is known about health impacts of altered emissions from the vehicles. Atherosclerosis-prone apolipoprotein E knockout (ApoE−/−) mice were exposed by inhalation to diluted exhaust (1.7 mg/m3, 20, 60 or 180 min, 5 day/week, for 4 weeks), from an engine using standard diesel fuel (DE) or the same diesel fuel containing 9 ppm cerium oxide nanoparticles (DCeE). Changes in hematological indices, clinical chemistry, atherosclerotic ...
Tópico(s): COVID-19 impact on air quality
2012 - Elsevier BV | Environmental Research
The western and southwestern parts of the Argentine Precordillera display complex geometries which are not consistent with those of a typical high-level fold-and-thrust belt. They are the result of a polyphase structural evolution which spans the Early Paleozoic to Late Tertiary period. After an Early Paleozoic folding and shearing event under a greenschist facies metamorphism, uplift, erosion, and deposition of Late Carboniferous to Early Permian clastics were accompanied by extensional faulting. ...
Tópico(s): earthquake and tectonic studies
1995 - Elsevier BV | Journal of South American Earth Sciences