106 research outputs found
The Jena Library of Biological Macromolecules - JenaLib
The JenaLib database ("www.fli-leibniz.de/IMAGE.html":http://www.fli-leibniz.de/IMAGE.html) offers value-added information for all Protein Data Bank (PDB) and Nucleic Acid Database (NDB) entries. This includes:
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Mining and developing nations: does mining contribute to socioeconomic development?
The hypothesis that an active mining industry results in decreased economic benefits to developing countries has often been supported by the theory commonly referred to as the Resource Curse. Data from the World Bank provides some support to the argument that there is a negative relationship between natural resource exploitation and economic development, but more recently it appears this relationship does not hold true. With the advent of corporate social responsibility and sustainable development there is increasing evidence that affirms an alternate hypothesis; that an active mining industry results in increased socioeconomic benefits to developing countries. In order to test this hypothesis this study relies on analysis of macroeconomic data primarily obtained from the World Bank, and in order to analyse measures relating to social development and welfare, examination of alternative measures using the United Nations’ Human Development Index and Millennium Development Goals. Investigation, using a sub-group of sub-Saharan developing countries as the sample selection, supports the alternative hypothesis
Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films
The angular-dependent critical current density, Jc(theta), and the upper
critical field, Hc2(theta), of epitaxial Ba(Fe1-xCox)2As2 thin films have been
investigated. No Jc(theta) peaks for H || c were observed regardless of
temperatures and magnetic fields. In contrast, Jc(theta) showed a broad maximum
at theta=90 degree, which arises from intrinsic pinning. All data except at
theta=90 degree can be scaled by the Blatter plot. Hc2(theta) near Tc follows
the anisotropic Ginzburg-Landau expression. The mass anisotropy increased from
1.5 to 2 with increasing temperature, which is an evidence for multi-band
superconductivity.Comment: Accepted in Physical Review B rapid communication
Influenced of Fe buffer thickness on the crystalline quality and the transport properties of Fe/Ba(Fe1-xCox)2As2 bilayers
The implementation of an Fe buffer layer is a promising way to obtain
epitaxial growth of Co-doped BaFe2As2 (Ba-122). However, the crystalline
quality and the superconducting properties of Co-doped Ba-122 are influenced by
the Fe buffer layer thickness, dFe. The well-textured growth of the Fe/Ba-122
bilayer with dFe = 15 nm results in a high Jc of 0.45 MAcm at 12 K in
self-field, whereas a low Jc value of 61000 Acm is recorded for the
bilayer with dFe = 4 nm at the corresponding reduced temperature due to the
presence of grain boundaries
The superconducting gaps in FeSe studied by soft point-contact Andreev reflection spectroscopy
FeSe single crystals have been studied by soft point-contact
Andreev-reflection spectroscopy. Superconducting gap features in the
differential resistance dV/dI(V) of point contacts such as a characteristic
Andreev-reflection double-minimum structure have been measured versus
temperature and magnetic field. Analyzing dV/dI within the extended two-gap
Blonder-Tinkham-Klapwijk model allows to extract both the temperature and
magnetic field dependence of the superconducting gaps. The temperature
dependence of both gaps is close to the standard BCS behavior. Remarkably, the
magnitude of the double-minimum structure gradually vanishes in magnetic field,
while the minima position only slightly shifts with field indicating a weak
decrease of the superconducting gaps. Analyzing the dV/dI(V) spectra for 25
point contacts results in the averaged gap values = 1.8+/-0.4meV and
=1.0+/-0.2 meV and reduced values 2/kTc=4.2+/-0.9 and
2/kTc=2.3+/-0.5 for the large (L) and small (S) gap, respectively.
Additionally, the small gap contribution was found to be within tens of percent
decreasing with both temperature and magnetic field. No signatures in the dV/dI
spectra were observed testifying a gapless superconductivity or presence of
even smaller gaps.Comment: 8 pages, 4 figs., 3 tables. Shortened version without fig.4 and Table
3 is accepted for publication in Phys. Rev.
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