642 research outputs found
Differentialdiagnose des pulmonalen Infiltrates nach Pneumothorax-Drainage
Zusammenfassung: Das Reexpansionsödem der Lunge stellt insgesamt eine seltene Komplikation sowohl im Rahmen der Pneumothoraxtherapie als auch bei der Behandlung des ausgedehnten Pleuraergusses dar. Die Pathogenese ist nicht vollstÀndig geklÀrt und scheint multifaktoriell zu sein. Bei Auftreten von Atembeschwerden nach Reexpansion einer zuvor kollabierten Lunge sollte unbedingt an ein Reexpansionsödem als mögliche Ursache gedacht werde
Applications of active microwave imagery
The following topics were discussed in reference to active microwave applications: (1) Use of imaging radar to improve the data collection/analysis process; (2) Data collection tasks for radar that other systems will not perform; (3) Data reduction concepts; and (4) System and vehicle parameters: aircraft and spacecraft
Discovery of the Vanadium Isotopes
Twenty-four vanadium isotopes have so far been observed; the discovery of
these isotopes is discussed. For each isotope a brief summary of the first
refereed publication, including the production and identification method, is
presented.Comment: to be published in At. Data. Nucl. Data Table
Novel Reconstruction Mechanism for Dangling-Bond Minimization: Combined Method Surface Structure Determination of SiC(111)-(3Ă3)
The SiC(111)â(3Ă3) phase was analyzed by scanning tunneling microscopy (STM), low-energy electron diffraction (LEED) holography, density functional theory (DFT), and conventional LEED. A single adatom per unit cell found in STM acts as a beam splitter for the holographic inversion of discrete LEED spot intensities. The resulting 3D image guides the detailed analyses by LEED and DFT which find a Si tetramer on a twisted Si adlayer with cloverlike rings. This twist model with one dangling bond left per unit cell represents a novel (nĂn)-reconstruction mechanism of group-IV (111) surfaces
LEED Holography applied to a complex superstructure: a direct view of the adatom cluster on SiC(111)-(3x3)
For the example of the SiC(111)-(3x3) reconstruction we show that a
holographic interpretation of discrete Low Energy Electron Diffraction (LEED)
spot intensities arising from ordered, large unit cell superstructures can give
direct access to the local geometry of a cluster around an elevated atom,
provided there is only one such prominent atom per surface unit cell. By
comparing the holographic images obtained from experimental and calculated data
we illuminate validity, current limits and possible shortcomings of the method.
In particular, we show that periodic vacancies such as cornerholes may inhibit
the correct detection of the atomic positions. By contrast, the extra
diffraction intensity due to slight substrate reconstructions, as for example
buckling, seems to have negligible influence on the images. Due to the spatial
information depth of the method the stacking of the cluster can be imaged down
to the fourth layer. Finally, it is demonstrated how this structural knowledge
of the adcluster geometry can be used to guide the dynamical intensity analysis
subsequent to the holographic reconstruction and necessary to retrieve the full
unit cell structure.Comment: 11 pages RevTex, 6 figures, Phys. Rev. B in pres
High Resolution Heavy Ion Track Structure Imaging
The difference in the relative biological efficincy (RBE) of ions of same
linear energy transfer (LET) but different atomic number (Z) can be attributed
to the difference in the radial ionisation distribution. In this contribution
we present data from measurements of the spatial ionisation pattern of heavy
ions of various Z but similar LET and compare the results with track structure
data obtained by Monte Carlo simulations. The measurements were made with a
time projection chamber with optical readout (Optical Avalanche Chamber, OPAC)
which is able to quantitatively capture the spatial ionisation pattern of an
ion traversing the chambe
Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar
The positron-neutrino correlation in the decay of
Ar was measured at ISOLDE by analyzing the effect of lepton recoil on
the shape of the narrow proton group following the superallowed decay. Our
result is consistent with the Standard Model prediction. For vanishing Fierz
interference we find , which yields improved
constraints on scalar weak interactions
The f_LT Response Function of D(e,e'p)n at Q^2=0.33(GeV/c)^2
The interference response function f_LT (R_LT) of the D(e,e'p)n reaction has
been determined at squared four-momentum transfer Q^2 = 0.33 (GeV/c)^2 and for
missing momenta up to p_miss= 0.29 (GeV/c). The results have been compared to
calculations that reproduce f_LT quite well but overestimate the cross sections
by 10 - 20% for missing momenta between 0.1 (GeV/c) and 0.2 (GeV/c) .Comment: 12 Pages, 10 figure
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