242 research outputs found
Über die Gelenkinfiltration maligner Knochentumoren unter besonderer Berücksichtigung der Inzidenzen, Infiltrationswege und radiologischen Charakteristika
Über die Gelenkinfiltration maligner Knochentumoren unter besonderer Berücksichtigung der Inzidenzen, Infiltrationswege und radiologischen Charakteristika In dieser Studie wurde die Inzidenz maligner Knochentumoren, die Infiltrationswege und die radiologischen Charakteristika der Gelenkinfiltration analysiert. Das Iliosakralgelenk zeigte eine höhere Infiltrationsrate als das Hüft- und Schultergelenk. Chondrosarkome und Osteosarkome zeigten eine höhere Rate an Gelenkinfiltrationen als Ewing-Sarkome. Die Gelenke wurden häufig über intraartikuläre Strukturen infiltriert. Verdächtige radiologische Befunde sollten zu der Annahme einer Gelenkinfiltration führen, und somit eine extraartikuläre Resektion nach sich ziehen. Dieses gilt insbesondere für Chondro- und Osteosarkome. Die Infiltrationsrate von Ewing-Sarkomen und kleinen Tumoren ist gering, so daß eine intraartikuläre Resektion durchgeführt werden kann, wenn radiologisch kein Verdacht einer Gelenkinfiltration besteht
A Further Perspective on Data Stewardship: Experiences and Challenges of "RDM-Stewards" in a Collaborative Project in Rhineland-Palatinate
Poster presented at the Data Stewardship Goes Germany Workshop at SLUB Dresden.This research and development project is funded by the German Federal Ministry of Education and Research (BMBF) within the funding measure Reuse and Management of Research Data at Universities of Applied Sciences (funding number 16FDFH104A) and financed within the Recovery and Resilience Facility of the European Union
Disparity of superconducting and pseudogap scales in low-Tc Bi-2201 cuprates
We experimentally study transport and intrinsic tunneling characteristics of
a single-layer cuprate Bi(2+x)Sr(2-y)CuO(6+delta) with a low superconducting
critical temperature Tc < 4 K. It is observed that the superconducting energy,
critical field and fluctuation temperature range are scaling down with Tc,
while the corresponding pseudogap characteristics have the same order of
magnitude as for high-Tc cuprates with 20 to 30 times higher Tc. The observed
disparity of the superconducting and pseudogap scales clearly reveals their
different origins.Comment: 5 page
Full-gap superconductivity robust against disorder in heavy-fermion CeCu2Si2
A key aspect of unconventional pairing by the antiferromagnetic
spin-fluctuation mechanism is that the superconducting energy gap must have
opposite sign on different parts of the Fermi surface. Recent observations of
non-nodal gap structure in the heavy-fermion superconductor CeCuSi were
then very surprising, given that this material has long been considered a
prototypical example of a superconductor where the Cooper pairing is
magnetically mediated. Here we present a study of the effect of controlled
point defects, introduced by electron irradiation, on the temperature-dependent
magnetic penetration depth in CeCuSi. We find that the
fully-gapped state is robust against disorder, demonstrating that low-energy
bound states, expected for sign-changing gap structures, are not induced by
nonmagnetic impurities. This provides bulk evidence for -wave
superconductivity without sign reversal.Comment: 5 pages, 4 figures + Supplemental Material (1 page, 1 figure). Will
appear in Phys. Rev. Let
Reply to Comment by Borisenko et al. on article `A de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs'
Recently, Borisenko et al have posted a Comment (arXiv:1108.1159) where they
suggest an alternative interpretation of our de Haas-van Alphen (dHvA)
measurements on the superconductor LiFeAs. In our original paper
(arXiv:1107.4375) we concluded that our measurements of the bulk Fermi surface
were not consistent with the surface bands observed thus far by ARPES.
Borisenko et al dispute this and suggest the two measurements are consistent if
some of the orbits we observe are due to magnetic breakdown. We argue here that
this scenario is inconsistent with the experimental data and therefore that our
original conclusion stands.Comment: 4 pages with figure
Correlation between Fermi surface transformations and superconductivity in the electron-doped high- superconductor NdCeCuO
Two critical points have been revealed in the normal-state phase diagram of
the electron-doped cuprate superconductor NdCeCuO by exploring
the Fermi surface properties of high quality single crystals by high-field
magnetotransport. First, the quantitative analysis of the Shubnikov-de Haas
effect shows that the weak superlattice potential responsible for the Fermi
surface reconstruction in the overdoped regime extrapolates to zero at the
doping level corresponding to the onset of superconductivity.
Second, the high-field Hall coefficient exhibits a sharp drop right below
optimal doping where the superconducting transition
temperature is maximum. This drop is most likely caused by the onset of
long-range antiferromagnetic ordering. Thus, the superconducting dome appears
to be pinned by two critical points to the normal state phase diagram.Comment: 9 pages; 7 figures; 1 tabl
Effect of a dopexamine induced increase in cardiac output on splanchnic hemodynamics in septic shock
Crossing the ballistic-ohmic transition via high energy electron irradiation
P.H.M. and M.D.B. received PhD studentship support from the UK Engineering and Physical Science Research Council via Grant No. EP/L015110/1. C.P. and P.J.W.M. are supported by the European Research Council under the European Union's Horizon 2020 research and innovation programme (Microstructured Topological Materials Grant No. 715730). E. Z. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Irradiation experiments performed on the SIRIUS platform were supported by the French National Network of Accelerators for Irradiation and Analysis of Molecules and Materials (EMIR&A) under Project No. EMIR 2019 18-7099.The delafossite metal PtCoO2 is among the highest-purity materials known, with low-temperature mean free path up to 5 μm in the best as-grown single crystals. It exhibits a strongly faceted, nearly hexagonal Fermi surface. This property has profound consequences for nonlocal transport within this material, such as in the classic ballistic-regime measurement of bend resistance in mesoscopic squares. Here, we report the results of experiments in which high-energy electron irradiation was used to introduce pointlike disorder into such squares, reducing the mean free path and therefore the strength of the ballistic-regime transport phenomena. We demonstrate that high-energy electron irradiation is a well-controlled technique to cross from nonlocal to local transport behavior and therefore determine the nature and extent of unconventional transport regimes. Using this technique, we confirm the origins of the directional ballistic effects observed in delafossite metals and demonstrate how the strongly faceted Fermi surface both leads to unconventional transport behavior and enhances the length scale over which such effects are important. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.Publisher PDFPeer reviewe
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