3,221 research outputs found
Spectral weight function for the half-filled Hubbard model: a singular value decomposition approach
The singular value decomposition technique is used to reconstruct the
electronic spectral weight function for a half-filled Hubbard model with
on-site repulsion from Quantum Monte Carlo data. A two-band structure
for the single-particle excitation spectrum is found to persist as the lattice
size exceeds the spin-spin correlation length. The observed bands are flat in
the vicinity of the points in the Brillouin zone, in
accordance with experimental data for high-temperature superconducting
compounds.Comment: 4 pages, Revtex
The inverse Laplace transform as the ultimate tool for transverse mass spectra
New high statistics data from the second generation of ultrarelativistic
heavy-ion experiments open up new possibilities in terms of data analysis. To
fully utilize the potential we propose to analyze the -spectra of
hadrons using the inverse Laplace transform. The problems with its inherent
ill-definedness can be overcome and several applications in other fields like
biology, chemistry or optics have already shown its feasability. Moreover, the
method also promises to deliver upper bounds on the total information content
of the spectra, which is of big importance for all other means of analysis.
Here we compute several Laplace inversions from different thermal scenarios,
both analytically and numerically, to test the efficiency of the method.
Especially the case of a two component structure, related to a possible first
order phase transition to a quark gluon plasma, is closer investigated and it
is shown that at least a signal to noise ratio of is necessary to
resolve two individual components.Comment: 13 pages (PostScript, including figures), BNL-NTHES
Hardening a Soft Budget Constraint Through 'Upward Devolution' to a Supranational Institution: The Case of Italian State-Owned Firms and the European Union
Public enterprises, Soft budget constraint, State aid, European integration, Italy, Federalism
Reflection in and on nursing practices- how nurses reflect and develop knowledge and skills during their nursing practice
Introduction: This paper present some theoretical foundations for reflection and also present some findingsfrom some studies including nurses’ reflections in and on nursing practice in various areas of nursing care.Aims: The aim of this paper was to critically discuss and analyze the application of reflection to nursing practiceand how it could become visible and understandable.Method: A secondary analysis was performed on some studies whereas the author had been involved in. Thissecondary analysis on all data focused on identifying reflection in nursing practice.Results: Data was abstracted and analyzed in order to making reflection in nursing practice visible. The resultsshow that reflection in nursing practice could be identified as reflection on action, reflection in action andreflection as self-discovering. Sometimes the nurses made good caring activities by intuition; they made someactions that they by experiences knew will function, but they had difficulties to verbalize this, in other words;they have what we call silent knowledge.Conclusion: Using reflections can access our theories in use so enabling others to learn. In this way the risk oftaking practice for granted has the potential to be reduced. So what nurses’ do- can be explored and shared –nurses can share and develop knowledge and experiences- nurses will be able to learn from each other as well asfrom ourselves
Epicardially secreted fibronectin drives cardiomyocyte maturation in 3D-engineered heart tissues
Early anteroposterior regionalisation of human neural crest is shaped by a pro-mesodermal factor
Cytotoxic and proinflammatory responses induced by ZnO nanoparticles in in vitro intestinal barrier
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