1,721,256 research outputs found
Algorithms and Complexity
No full textThis special issue includes papers selected from the Sixth Italian Conference on Algorithms and Complexity (CIAC 2006), which was held at the Department of Computer Science of the “Sapienza” University of Rome, Italy from May 29 to May 31, 2006. CIAC is a series of international conferences that present original research contributions in all aspects of the use, design, analysis and experimentation of efficient algorithms and data structures.
This special issue include six papers invited from the 33 contributions accepted for presentation at the conference. The papers that appear in this volume are in a variety of different directions, reflecting the fact that research in algorithmics is very lively and relevant to many areas. The papers in this special issue are final, generally widely rewritten and expanded versions of the conference papers and have been fully refereed in accord with the high standards of the Journal of Discrete Algorithms.
We would like to thank all the colleagues who contributed to this special issue. In particular, we wish to thank the authors for the fine quality of their work, and their diligent efforts during the refereeing process. Our warmest appreciation also goes to the excellent job done by the numerous referees, who played a vital role in making this special issue live up to high quality standards. We hope the readers will enjoy the result
Preface: fluids and tectonics
No full textThe 8th International Conference on Gas Geochemistry provided the opportunity for scientists from different countries to meet each other, exchange ideas on the state of the art in gas geochemistry, and discuss advance in fluid geochemistry. The 8th ICGG meeting focused on three main geologic environments currently interacting with the human life: volcanoes, earthquakes and hydrocarbons. Ninety-four presentations gave participants chance to cover a variety of important research topics on gas geochemistry in geosciences including: gas migration in terrestrial and marine environments, Earth degassing and its relation to seismicity, volcanic eruptions, rare gases and application of isotope techniques, measurement and analytical techniques. This special issue of Annals of Geophysics collects some of the papers presented dealing with the general problem of the relation between fluids and tectonic activity. Since virtually all geodynamic processes are related to fluids, the conference constituted a further step to enhance our understanding of the special role of gases in the sesismogenic processes
Joint inversion of Gravity Gradient Tensor at Vredefort impact crater - We 21 C08
No full textIn recent years, Gravity Gradient Tensor (GGT) has been successfully used in applied and environmental geophysics, also in light of the development of gradiometers. In this paper, we aim at analyzing the inversion, either joint or separate, of different GGT components and of the sole gravity field vertical component. We perform our analysis by inspection of the Picard Plot, a well-known Singular Value Decomposition tool, and employ both synthetic data and gradiometer measurements carried out at the Vredefort structure, South Africa. We show that the main factors controlling the quality of the inversion are algebraic ambiguity and signal-to-noise ratio. Provided that algebraic ambiguity is kept low – by different combinations of GGT components and/or only gravity field data – the choice of components involved in the inversion is non-crucial to the quality of the reconstructions. Nonetheless, the use gradiometers allows a quicker and more effective way, with respect to the sole gravity field, to improve algebraic ambiguity
[Syndrome caused by surfactant deficiency and ventilatory dysfunction in the newborn infant. Clinico-radiological diagnostic problems]. FT Sindrome da deficit del surfactant e disfunzione ventilatoria del neonato. Problemi diagnostici clinico-radiologici.
No full textHydrothermal fluids vented at shallow depths at the Aeolian islands: relationships with volcanic and geothermal systems.
No full textScuba diving investigations carried out over the last two decades at the Aeolian islands
revealed the existence of submarine magmatic and late-magmatic hydrothermalism at all the islands,
despite the absence of on-shore activity at some of the islands. The results gained by diving
activities provided useful information to evaluate the volcanic and geothermal activity and to
manage the volcanic crisis occurred on November 2002 off the island of Panarea.PublishedFreiberg-Germanyope
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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