Search results for "Oration"

Hawking radiation correlations in Bose-Einstein condensates using quantum field theory in curved space

2013

The density-density correlation function is computed for the Bogoliubov pseudoparticles created in a Bose-Einstein condensate undergoing a black hole flow. On the basis of the gravitational analogy, the method used relies only on quantum field theory in curved spacetime techniques. A comparison with the results obtained by ab initio full condensed matter calculations is given, confirming the validity of the approximation used, provided the profile of the flow varies smoothly on scales compared to the condensate healing length.

Black hole evaporation in a thermalized final-state projection model

2007

4 pages, 1 figure.-- PACS nrs.: 04.70.Dy; 03.67.-a.-- ISI Article Identifier: 000245333600044.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-th/0611152

Quantum geometry and microscopic black hole entropy

2006

9 pages, 6 figures.-- PACS nrs.: 04.60.Pp, 04.70.Dy.-- ISI Article Identifier: 000242448900013.-- Published online on Nov 28, 2006.

Evolución de la colaboración científica en la psicología española entre 1970 y 1989

2021

[EN]: The objective of this research is to analyse the evolution of scientific collaboration within Spanish psychology through papers signed by an author who belonged to a Spanish institution of psychology between 1970 and 1989. We analysed a total of 2891 papers published in 29 journals of psychology between 1970 and 1989, examining the scientific collaboration through network analysis, using the UCINET program and Netdraw software. The results indicated that there has been an increased number of papers, authors and signatures over the years, as well as an increased scientific collaboration. Between 1985 and 1989, co-authored papers overcame single-author papers. It is shown that the numbe…

Multiple approaches to identify bacteria in archaeological waterlogged wood

2013

This study was carried out in collaboration with Soprintendenza del Mare (SM) that started, since 2004, to plan and realize underwater archaeological parks, such as in the Sicilian islands of Pantelleria (Gadir), Levanzo (Cala Minnola), Ustica (Falconiera), Panarea (Basiluzzo) and Filicudi (Capo Graziano). In situ conservation, as well as virtual exhibitions of the same topics, can contribute to ensure the protection and best fruition of underwater cultural heritage. The focus of this study was the identification of bacterial colonies in waterlogged wood samples from the rostrum of a excellent workmanship, that is very likely one of the wrecks attributed to Sextus Pompey fleet (36 BC) and d…

Positive ion extraction across the superfluid-vapor helium interface

2009

The extraction efficiency of positive (219)Rn ions across the superfluid-vapor helium interface above similar to 1.3 K indicates that extraction results from thermal activation across a barrier of about 20 K. Below similar to 1.3 K, the extraction efficiency is constant at about 0.7%. The evaporation of the superfluid surface by second sound pulses has a negative impact on the ion extraction, but not on the ions themselves. It takes 3.2( 6) s at 1.60 K and 15( 6) s at 1.15 K for the extraction process to recover from a disturbed state of yet unknown nature.

2019

We investigate how and why the Nokia Corporation failed to develop a successful strategic response to the threats of Apple and Google in the smartphone business and instead worsened its situation t...

Seeing the Invisible: The Introduction and Development of Electron Microscopy in Britain, 1935–1945

2013

INTRODUCTIONSpring, 1941. The German campaigns in the Balkans are strengthening the Nazi domination of continental Europe. The Lend-Lease bill signed by Roosevelt on 1 1 March has broken any neutrality pretence of the USA. War material is being sold, transferred or leased to the Allied nations in the name of assisting US defence. The war is about to become global and US and British leaders discuss strategy in the event that the USA finally enters actively into the war. In this context, the British physicist Charles Galton Darwin (1887-1962) is appointed Director of the British Central Scientific Office in Washington - an institution conceived to promote closer contact and exchange of inform…

The Lure of Katanga Copper : Tanganyika Concessions Limited and the Anatomy of Mining and Mine Exploration 1899–1906

2016

This article provides a rare opportunity to follow the inception of mining and mine exploration economy in the first years of the European presence in colonial Zambia and Katanga as seen through the eyes of prospectors and mining experts working for the London-based company Tanganyika Concessions Limited. It draws on company records as well as the personal records of the early company employees who worked in North Western Rhodesia and adjoining Katanga until 1906. The most thought-provoking documents include diaries, letters and photographs, which depict the organisation and processes of early mining work, modes of mine exploration, and relations within the first mining communities and betw…

FIRST experiment: Fragmentation of Ions Relevant for Space and Therapy

2013

International audience; Nuclear fragmentation processes are relevant in different fields of basic research and applied physics and are of particular interest for tumor therapy and for space radiation protection applications. The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at SIS accelerator of GSI laboratory in Darmstadt, has been designed for the measurement of different ions fragmentation cross sections at different energies between 100 and 1000 MeV/nucleon. The experiment is performed by an international collaboration made of institutions from Germany, France, Italy and Spain. The experimental apparatus is partly based on an already existing setup made of the …