2,128 research outputs found
Hadron Spectroscopy with COMPASS at CERN
The aim of the COMPASS hadron programme is to study the light-quark hadron
spectrum, and in particular, to search for evidence of hybrids and glueballs.
COMPASS is a fixed-target experiment at the CERN SPS and features a two-stage
spectrometer with high momentum resolution, large acceptance, particle
identification and calorimetry. A short pilot run in 2004 resulted in the
observation of a spin-exotic state with consistent with the
debated . In addition, Coulomb production at low momentum transfer
data provide a test of Chiral Perturbation Theory. During 2008 and 2009, a
world leading data set was collected with hadron beam which is currently being
analysed. The large statistics allows for a thorough decomposition of the data
into partial waves. The COMPASS hadron data span over a broad range of channels
and shed light on several different aspects of QCD.Comment: 4 pages, 5 figure
Electrical conductivity and phase diagram of binary alloys. 21: The system palladium-chromium
Pd-Cr alloys were investigated by thermal analysis, hardness measurements, X-ray analysis, microscopic examination of etched pieces, and temperature-resistance curves of the solid alloys. Only one compound, Pd2Cr3, m, 1389 deg, is formed. It possesses a cubic face centered lattice and forms with excess Pd a series of solid solutions with a minimum m.p. at 45 atoms% Pd. Hardness maximum appears at the Pd2Cr3 point. Pd2Cr3 forms no solid solutions with Cr but eutectic point appears at 25 atoms% Pd, m. 1320 deg. The sp. resistance of pure Cr in an atom of H, indicates no allotropic forms. Cr2O3 is solid in molten Cr. Pure Cr melts at 1890 plus or minus 10 deg but Cr contg. Cr2O3 starts to melt at 1770 to 1790 deg
Magnetic properties of single-crystalline CeCuGa3
The magnetic behavior of single-crystalline CeCuGa3 has been investigated.
The compound forms in a tetragonal BaAl4-type structure consisting of
rare-earth planes separated by Cu-Ga layers. If the Cu-Ga site disorder is
reduced, CeCuGa3 adopts the related, likewise tetragonal BaNiSn3-type
structure, in which the Ce ion are surrounded by different Cu and Ga layers and
the inversion symmetry is lost. In the literature conflicting reports about the
magnetic order of CeCuGa3 have been published. Single crystals with the
centrosymmetric structure variant exhibit ferromagnetic order below approx. 4 K
with a strong planar anisotropy. The magnetic behavior above the transition
temperature can be well understood by the crystal-field splitting of the 4f
Hund's rule ground-state multiplet of the Ce ions
Photobiont selectivity leads to ecological tolerance and evolutionary divergence in a polymorphic complex of lichenized fungi
Background and Aims The integrity and evolution of lichen symbioses depend on a fine-tuned combination of
algal and fungal genotypes. Geographically widespread species complexes of lichenized fungi can occur in habitats
with slightly varying ecological conditions, and it remains unclear howthis variation correlates with symbiont selectivity
patterns in lichens. In an attempt to address this question, .300 samples were taken of the globally distributed
and ecologically variable lichen-forming species complex Tephromela atra, together with closely allied species, in
order to study genetic diversity and the selectivity patterns of their photobionts.
\u2020 Methods Lichen thalli of T. atra and of closely related species T. grumosa, T. nashii and T. atrocaesia were
collected from six continents, across 24 countries and 62 localities representing a wide range of habitats. Analyses
of genetic diversity and phylogenetic relationships were carried out both for photobionts amplified directly from
the lichen thalli and from those isolated in axenic cultures. Morphological and anatomical traits were studied with
light and transmission electron microscopy in the isolated algal strains.
\u2020 Key Results Tephromela fungal species were found to associate with 12 lineages of Trebouxia. Five new clades
demonstrate the still-unrecognized genetic diversity of lichen algae. Culturable, undescribed lineageswere also characterized
by phenotypic traits. Strong selectivity of the mycobionts for the photobionts was observed in six monophyletic
Tephromela clades. Seven Trebouxia lineages were detected in the poorly resolved lineage T. atra sensu
lato, where co-occurrence of multiple photobiont lineages in single thalli was repeatedly observed.
\u2020Conclusions Lowselectivity apparently allows widespread lichen-forming fungi to establish successful symbioses
with locally adapted photobionts in a broader range of habitats. This flexibility might correlate with both lower phylogenetic
resolution and evolutionary divergence in species complexes of crustose lichen-forming fungi
Immunological characterization of chromogranins A and B and secretogranin II in the bovine pancreatic islet
Antisera against chromogranin A and B and secretogranin II were used for analysing the bovine pancreas by immunoblotting and immunohistochemistry. All three antigens were found in extracts of fetal pancreas by one dimensional immunoblotting. A comparison with the soluble proteins of chromaffin granules revealed that in adrenal medulla and in pancreas antigens which migrated identically in electrophoresis were present. In immunohistochemistry, chromogranin A was found in all pancreatic endocrine cell types with the exception of most pancreatic polypeptide-(PP-) producing cells. For chromogranin B, only a faint immunostaining was obtained. For secretorgranin II, A-and B-cells were faintly positive, whereas the majority of PP-cells exhibited a strong immunostaining for this antigen. These results establish that chromogranins A and B and secretogranin II are present in the endocrine pancreas, but that they exhibit a distinct cellular localization
The Impact of SAP on the Utilisation of Business Process Management (BPM) Maturity Models in ERP projects
The SAP Enterprise Resource Planning (ERP) system is a leading software solution for corporate business functions and processes. Business Process Management (BPM) is a management approach designed to create and manage organizations’ business processes. Both promise an improvement of business processes in companies and can be used together in organizations. In conjunction with the SAP ERP system and BPM approach, BPM maturity models can be used as diagnostic tools that allow an organization to assess and monitor the maturity of its business processes. This research analyses the complex relationships between SAP, BPM and BPM maturity models. The aim is to investigate and analyse the interaction between the use of the SAP ERP software package and the deployment of BPM maturity models. The research adopts a multiple case study approach, based on semi-structured expert interviews, and provides an in-depth insight into how a small number of organizations use SAP, BPM and BPM maturity models
Managing Process Change and Standardisation in ERP Projects: An Assessment of the SAP Template Approach
The use of templates for process alignment in ERP
projects is an established practice and many companies have used this approach when implementing the SAP ERP software system. This research paper deals with the question of how companies use a template in a business process management environment and, more specifically, what happens when there are requests for changes to the template. Based on a literature review and personal interviews, this article assesses the commitments that manufacturing companies make regarding template implementation within SAP business process management. It suggests that "Defend the template!" may be an appropriate overarching goal
Management Guidelines for Better Application of Business Process Management in SAP ERP projects
The SAP Enterprise Resource Planning (ERP)
system is a leading software solution for corporate business functions and processes. Business Process Management (BPM) is a management approach designed to create and manage organizations’ business processes. Both promise an improvement of business processes in companies and can be used together in organizations. In conjunction with the SAP ERP system and BPM approach, BPM maturity models can be used as diagnostic tools that allow an organization to assess and monitor the maturity of its business processes. The aim is to investigate and analyse the interaction between the use of the SAP ERP software package and the utilization of BPM.
Findings derive from an analysis of eleven semi-structured
expert interviews and a validation of the guidelines via an online survey with 151 participants that use SAP, BPM and/or BPM maturity models. This research analyses the complex relationships between SAP, BPM and BPM maturity models and develops management guidelines for improved use of BPM in SAP ERP projects
Theory of Umklapp-assisted recombination of bound excitons in Si:P
We present the calculations for the oscillator strength of the recombination
of excitons bound to phosphorous donors in silicon. We show that the direct
recombination of the bound exciton cannot account for the experimentally
measured oscillator strength of the no-phonon line. Instead, the recombination
process is assisted by an umklapp process of the donor electron state. We make
use of the empirical pseudopotential method to evaluate the Umklapp-assisted
recombination matrix element in second-order perturbation theory. Our result is
in excellent agreement with the experiment. We also present two methods to
improve the optical resolution of the optical detection of the spin state of a
single nucleus in silicon.Comment: 9 pages, 6 EPS figures, Revtex
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