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2017-04-28
11:28
[PUBDB-2017-02077] Dissertation / PhD Thesis
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Dynamics of colloidal systems ofmagnetic nanoparticles underinfluence of magnetic fieldsinvestigated by XPCS
i - 187 (2017)
This thesis investigates structural properties and the underlying microscopic dynamicsof suspensions ofα-FeOOH goethite platelets in water under the influence of magneticfields. Goethite particles show unusual physical properties and a rich phase diagram,which makes their suspensions an object of high interest for research in the area of”smart nanoparticles”. [...]
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2017-04-25
18:11
OpenAccess [PUBDB-2017-01894] Journal Article
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Pressure-induced structural change in liquid GaIn eutectic alloy
ddc:000
Synchrotron x-ray diffraction reveals a pressure induced crystallization at about 3.4 GPa and apolymorphic transition near 10.3 GPa when compressed a liquid GaIn eutectic alloy up to ~13 GPa atroom temperature in a diamond anvil cell. Upon decompression, the high pressure crystalline phaseremains almost unchanged until it transforms to the liquid state at around 2.3 GPa. [...]
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2017-04-24
16:59
OpenAccess [PUBDB-2017-01848] Journal Article
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Elucidation of the helical spin structure of FeAs
ddc:530
We present the results of resonant x-ray scattering measurements and electronic structure calculations on the monoarsenide FeAs. We elucidate details of the magnetic structure, showing the ratio of ellipticity of the spin helix is larger than previously thought, at 2.58(3), and reveal both a right-handed chirality and an out-of-plane component of the magnetic moments in the spin helix. [...]
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2017-04-18
13:48
[PUBDB-2017-01676] Journal Article
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Photoionization of Ne Atoms and Ne$^{+}$ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections
ddc:520
Single, double, and triple photoionization of Ne$^{+}$ ions by single photons have been investigated at the synchrotron radiation source PETRA III in Hamburg, Germany. Absolute cross-sections were measured by employing the photon–ion merged-beams technique. [...]
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2017-03-29
09:21
[PUBDB-2017-01494] Journal Article
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Role of Sputter Deposition Rate in Tailoring Nanogranular Gold Structures on Polymer Surfaces
ddc:540
The reproducible low-cost fabrication of functional polymer–metal interfaces via self-assembly is of crucial importance in organic electronics and organic photovoltaics. In particular, submonolayer and nanogranular systems expose highly interesting electrical, plasmonic, and catalytic properties. [...]

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2017-03-29
09:17
OpenAccess [PUBDB-2017-01493] Journal Article
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Transparent polycrystalline cubic silicon nitride
ddc:000
Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe conditions [...]
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2017-03-21
11:50
[PUBDB-2017-01428] Journal Article
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Study of pattern transition in nanopatterned Si(100) produced by impurity-assisted low-energy ion-beam erosion
ddc:530
In this work, formation of self-organized Si nanostructures induced by pure Fe incorporation during normal incidence low-energy (1keV) Ar$^{+}$ ion bombardment is presented. It has been observed that the incorporation of Fe affects the evolution of the surface topography [...]
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2017-03-15
09:30
OpenAccess [PUBDB-2017-01375] Journal Article
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Opening a nodal gap by fluctuating spin-density wave in lightly doped La$_{2−x}$Sr$_x$CuO$_4$
ddc:530
We investigate whether the spin or charge degrees of freedom are responsible for the nodal gap in underdoped cuprates by performing inelastic neutron scattering and x-ray diffraction measurements on La$_{2−x}$Sr$_x$CuO$_4$, which is on the edge of the antiferromagnetic phase. We found that a fluctuating incommensurate spin-density wave (SDW) with a bottom part of an hourglass dispersion exists even in this magnetic sample [...]
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2017-03-13
13:36
[PUBDB-2017-01362] Journal Article
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Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy
ddc:540
Using X-ray absorption near edge structure (XANES) spectroscopy, information on the local chemical structure and oxidation state of an element of interest can be acquired. Conventionally, this information can be obtained in a spatially resolved manner by scanning a sample through a focused X-ray beam [...]

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2017-03-13
13:28
[PUBDB-2017-01361] Journal Article
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Simplex Volume Maximization (SiVM): A matrix factorization algorithm with non-negative constrains and low computing demands for the interpretation of full spectral X-ray fluorescence imaging data
ddc:540
Technological progress allows for an ever-faster acquisition of hyperspectral data, challenging the users to keep up with interpreting the recorded data. Matrix Factorization, the representation of data sets by bases (or loads) and coefficient (or score) images is long used to support the interpretation of complex data sets. [...]
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