15,667 research outputs found
Septic Arthritis Caused by Legionella dumoffii in a Patient with Systemic Lupus Erythematosus-Like Disease
We describe a patient with systemic lupus erythematosus (SLE)-like disease on immunosuppressive treatment who developed septic arthritis of the knee involving Legionella dumoffii. Cultures initially remained negative. A broad-range 16S PCR using synovial fluid revealed L. dumoffii rRNA genes, a finding that was subsequently confirmed by positive Legionella culture results
Physical limitations to the spatial resolution of solid-state detectors
In this paper we explore the effect of -ray emission, fluctuations in
th e signal deposition on the detection of charged particles in silicon-based
detec tors. We show that these two effects ultimately limit the resolution that
can be achieved by interpolation of the signal in finely segmented
position-sensitive solid-state devices.Comment: 5 page
Method to make a single-step etch mask for 3D monolithic nanostructures
Current nanostructure fabrication by etching is usually limited to planar
structures as they are defined by a planar mask. The realisation of
three-dimensional (3D) nanostructures by etching requires technologies beyond
planar masks. We present a method to fabricate a 3D mask that allows to etch
three-dimensional monolithic nanostructures by using only CMOS-compatible
processes. The mask is written in a hard-mask layer that is deposited on two
adjacent inclined surfaces of a Si wafer. By projecting in single step two
different 2D patterns within one 3D mask on the two inclined surfaces, the
mutual alignment between the patterns is ensured. Thereby after the mask
pattern is defined, the etching of deep pores in two oblique directions yields
a three-dimensional structure in Si. As a proof of concept we demonstrate 3D
mask fabrication for three-dimensional diamond-like photonic band gap crystals
in silicon. The fabricated crystals reveal a broad stop gap in optical
reflectivity measurements. We propose how 3D nanostructures with five different
Bravais lattices can be realised, namely cubic, tetragonal, orthorhombic,
monoclinic, and hexagonal, and demonstrate a mask for a 3D hexagonal crystal.
We also demonstrate the mask for a diamond-structure crystal with a 3D array of
cavities. In general, the 2D patterns for the different surfaces can be
completely independent and still be in perfect mutual alignment. Indeed, we
observe an alignment accuracy of better than 3.0 nm between the 2D mask
patterns on the inclined surfaces, which permits one to etch well-defined
monolithic 3D nanostructures.Comment: 18 pages, 10 figure
Building a Socio-technical Perspective of Community Resilience with a Semiotic Approach
Situated in the diversity and adversity of real-life contexts facing crisis situations, this research aims at boosting the resilience process within communities supported by digital and social technology. In this paper, eight community leaders in different parts of the world are invited to express their issues and wishes regarding the support of technology to face social challenges. Methods and artefacts based on the Organisational Semiotics (OS) and the Socially-Aware computing have been applied to analyse and consolidate this data. By providing both a systemic view of the problem and also leading to the identification of requirements, the analysis evidences some benefits of the OS-based approach to consolidate perspectives from different real-life scenarios towards building a socio-technical solution
From Judgment to Justice: Implementing International and Regional Human Rights Decisions
Examines the European, Inter-American, and African human rights systems and United Nations treaty bodies; how well court decisions are implemented; and what monitoring mechanisms exist. Suggests ways to strengthen implementation and, in turn, legitimacy
The Kazhdan-Lusztig conjecture for W-algebras
The main result in this paper is the character formula for arbitrary
irreducible highest weight modules of W algebras. The key ingredient is the
functor provided by quantum Hamiltonian reduction, that constructs the W
algebras from affine Kac-Moody algebras and in a similar fashion W modules from
KM modules. Assuming certain properties of this functor, the W characters are
subsequently derived from the Kazhdan-Lusztig conjecture for KM algebras. The
result can be formulated in terms of a double coset of the Weyl group of the KM
algebra: the Hasse diagrams give the embedding diagrams of the Verma modules
and the Kazhdan-Lusztig polynomials give the multiplicities in the characters.Comment: uuencoded file, 29 pages latex, 5 figure
Cosmic rays studied with a hybrid high school detector array
The LORUN/NAHSA system is a pathfinder for hybrid cosmic ray research
combined with education and outreach in the field of astro-particle physics.
Particle detectors and radio antennae were mainly setup by students and placed
on public buildings. After fully digital data acquisition, coincidence
detections were selected. Three candidate events confirmed a working prototype,
which can be multiplied to extend further particle detector arrays on high
schools.Comment: 10 pages, 6 figures. Nigl, A., Timmermans, C., Schellart, P.,
Kuijpers, J., Falcke, H., Horneffer, A., de Vos, C. M., Koopman, Y., Pepping,
H. J., Schoonderbeek, G., Cosmic rays studied with a hybrid high school
detector array, Europhysics News (EPN), Vol. 38, No. 5, accepted on
22/08/200
An eccentric companion at the edge of the brown dwarf desert orbiting the 2.4 Msun giant star HIP67537
We report the discovery of a substellar companion around the giant star
HIP67537. Based on precision radial velocity measurements from CHIRON and FEROS
high-resolution spectroscopic data, we derived the following orbital elements
for HIP67537: msin = 11.1 M,
= 4.9 AU and = 0.59. Considering
random inclination angles, this object has 65% probability to be
above the theoretical deuterium-burning limit, thus it is one of the few known
objects in the planet to brown-dwarf transition region. In addition, we
analyzed the Hipparcos astrometric data of this star, from which we derived a
minimum inclination angle for the companion of 2 deg. This value
corresponds to an upper mass limit of 0.3 M, therefore the
probability that HIP67537 is stellar in nature is 7%. The large
mass of the host star and the high orbital eccentricity makes HIP67537 a
very interesting and rare substellar object. This is the second candidate
companion in the brown dwarf desert detected in the sample of intermediate-mass
stars targeted by the EXPRESS radial velocity program, which corresponds to a
detection fraction of = 1.6%. This value is larger than the
fraction observed in solar-type stars, providing new observational evidence of
an enhanced formation efficiency of massive substellar companions in massive
disks. Finally, we speculate about different formation channels for this
object.Comment: Accepted for publication to A&
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