Results 31 to 40 of about 215,735 (298)
Cosmic Crystallography with a Pullback [PDF]
Phys.Lett. A261 (1999) 235-239, 1999 We present a modified version of the cosmic crystallography method, especially useful for testing closed models of negative spatial curvature. The images of clusters of galaxies in simulated catalogs are ``pulled back'' to the fundamental domain before the set of distances is calculated.
arxiv +1 more source
Zeitschrift für Kristallographie, 2012 We summarize exploratory work on multigrain crystallography. The experimental arrangement comprises a monochromatic beam, a fully illuminated sample with up to several hundred grains in transmission geometry on a rotary table and a 2D detector. Novel algorithms are presented for indexing, integration and filtering with emphasis on handling the ...
Sørensen, Henning Osholm +10 more
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Fluorescent Bis(guanidine) Copper Complexes as Precursors for Hydroxylation Catalysis
Inorganics, 2018 Bis(guanidine) copper complexes are known for their ability to activate dioxygen. Unfortunately, until now, no bis(guanidine) copper-dioxygen adduct has been able to transfer oxygen to substrates.
Florian Strassl +8 more
doaj +1 more source
Characterization of crystal structure and precipitation crystallography of a new MgxAl2-xGd phase in Mg97Al1Gd2 alloy [PDF]
Journal of applied crystallography, 2016, 2016 The composition, crystal structure and precipitation crystallography of a newly found precipitate are characterized by a Cs-corrected scanning transmission electron microscopy (STEM). The composition of the plate-like precipitate could be expressed as MgxAl2-xGd (x = 0.38), and its crystal structure is the same as the fcc type Laves phases Mg2Gd and ...
arxiv +1 more source
Quasi-Periodic Crystals—The Long Road from Discovery to Acceptance
Rambam Maimonides Medical Journal, 2013 [Extract] Three surprising discoveries on the nature of matter and its properties were published in the mid-1980s. All these discoveries led to Nobel prizes. The first discovery was in 1985, when fullerenes were discovered by Robert F.
Daniel Schechtman
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, 2003 Crystallography has proven a rich source of ideas over several centuries. Among the many ways of looking at space groups, N. David Mermin has pioneered the Fourier-space approach. Recently, we have supplemented this approach with methods borrowed from algebraic topology. We now show what topology, which studies global properties of manifolds, has to do
arxiv +1 more source
Amplification of UV radiation and gain mechanisms in ZnO films with loose-packed structure
Компьютерная оптикаThe modern demands for miniaturization of optoelectronic devices, in particular, for the UV range, are inextricably linked with the improvement of fabrication technologies for the corresponding photonic nano/micro objects and the study of their radiative
L.A. Zadorozhnaya +3 more
doaj +1 more source
Frontiers in Earth Science, 2018 Although carbonate-precipitating cyanobacteria are ubiquitous in aquatic ecosystems today, the criteria used to identify them in the geological record are subjective and rarely testable.
Jan-Filip Päßler +3 more
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Frontiers in Chemistry, 2021 The synthesis and characterization of three aromatic oligoamides, constructed from the same pyridyl carboxamide core but incorporating distinct end groups of acetyl (Ac) 1, tert-butyloxycarbonyl (Boc) 2 and amine 3 is reported.
Pierre Delfosse +6 more
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ESSENTIALS OF CRYSTALLOGRAPHY. [PDF]
Journal of the American Chemical Society, 1907 n ...
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