Search results for "Ion source"
showing 10 items of 337 documents
Visibilidad y usabilidad de la literatura profesional en DoIS (Documents in Information Science)
2004
The fundamental aspect born with the generalization of information networks has been the phenomenon of the tooinformation, the availability of a great number of resources means that the people, whom deposit their documents in the network, establish appropriate mechanisms so the information is accessible and recovered. Over the last years in Library and Information Science, several LIS professionals work in DoIS, Documents in Information Science. The DoIS team has been working the visibility and usability of the site, to fulfill the objective to spread the service within the community of librarians and archivists.
Els manuscrits medievals : entre l'encís i la veneració
1998
In our cities samples and exhibitions have been seen that show to tthe citizens the obtained progresses of the last years and with assiduity, in them, some manuscripts are presents. A considerable part of the public admires them and contemplates astonished; and to others nor it interests to them.
Innovation among SMEs in Finland: The impact of stakeholder engagement and firm-level characteristics
2021
PURPOSE: The aim of the paper is to analyse the importance of both internal capabilities (resources) and external information sources in implementing product, process, marketing and organizational innovations aiming to maximize firm competitive advantage and create value for stakeholders. Furthermore, in particular, we examine the role of public organizations, business networks, firm size, and the industry sector, in the emergence of different types of product, process, marketing, and organizational innovations. The research was based on the typology of innovation (product, process, marketing, and organizational) adopted by the OECD. METHODOLOGY: The paper is based on data from 389 SMEs loc…
Early onset of deformation in the neutron-deficient polonium isotopes
2012
In-source laser spectroscopy has been performed at CERN-ISOLDE with the RILIS laser ion source on Po-191-204,Po-206,Po-208-211,Po-216,Po-218. New information on the beta decay of Po-199 were extracted in the process, challenging previous results. Large-scale atomic calculations were performed to extract the changes in the mean-square charge radius delta from the isotope shifts. The delta for the even-A isotopes reveal a large deviation from the spherical droplet model for N < 116.
Mirando la esfera de las horas: literatura, tiempo y antifascismo en el Bienio Negro
2019
This text attempts to be an invitation to think about a temporal experience that claims to be historically thought in order to articulate the resistance against fascism. First of all, I will introduce the discussion of the definition of the republican project, by studying the implications of the term it applied to itself: revolution. With this, I will introduce Ehrenburg’s view of the tensions of the time as a temporary pathology. Later, I will outline the antifascist political culture through the magazines Linea and Nueva Cultura. Then, I will approach Historia de un dia (Sender et al., 1935) and explain the link between the representations of time and the people. Afterwards, I will procee…
Ethnic differences in utilization of online health information sources : A test of the social inequality hypotheses
2023
The goal of the current study was to understand ethnic differences in use of online health information sources. Social stratification and social diversification hypotheses were used as study’s theoretical framework. The data were obtained from the 2017 Israel Social Survey (N = 2166). Multinomial and logistic regression techniques were used for the multivariate analysis. The results suggest that Israeli Arab respondents were less likely than Israeli-born Jewish respondents to seek health information using the Health Funds’ call centers or websites, other websites, and to utilize any number of the online health information sources. The findings provide a strong support for the social strati…
The identification of autoionizing states of atomic chromium for the resonance ionization laser ion source of the ISOLDE radioactive ion beam facility
2017
Abstract This paper presents the results of an investigation into autoionizing states of atomic chromium, in the service of the resonance ionization laser ion source (RILIS): the principal ion source of the ISOLDE radioactive ion beam facility based at CERN. The multi-step resonance photo-ionization process enables element selective ionization which, in combination with mass separation, allows isotope specific selectivity in the production of radioactive ion beams at ISOLDE. The element selective nature of the process requires a multi-step “ionization scheme” to be developed for each element. Using the method of in-source resonance ionization spectroscopy, an optimal three-step, three-reson…
Space-Charge Effects with REXTRAP
2001
The beam quality of radioactive ion beams produced by present target ion source technology is often not sufficient for direct post-acceleration. Furthermore, pulsed beams insure a more efficient use of an accelerator. In the case of REX-ISOLDE, the post accelerator at the CERN ISOLDE facility, a gas-filled Penning trap (REXTRAP) has been chosen for accumulation of the radioactive ions and conversion into cooled bunches. Radial centering of the ions is achieved by applying an rf field with a frequency equal to the cyclotron frequency of the desired ion species. The efficiency achieved in the first tests with different isotopes covering nearly the entire mass range was already >20%. Going to …
Radium ionization scheme development: The first observed autoionizing states and optical pumping effects in the hot cavity environment
2018
© 2018 The Authors This paper reports on resonance ionization scheme development for the production of exotic radium ion beams with the Resonance Ionization Laser Ion Source (RILIS) of the CERN-ISOLDE radioactive ion beam facility. During the study, autoionizing states of atomic radium were observed for the first time. Three ionization schemes were identified, originating from the 7s2 1S0 atomic ground state. The optimal of the identified ionization schemes involves five atomic transitions, four of which are induced by three resonantly tuned lasers. This is the first hot cavity RILIS ionization scheme to employ optical pumping effects. The details of the spectroscopic studies are described …
Carbon nanotubes embedded in a polyimide foil for proton acceleration with a sub-ns laser
2021
A series of thin films made of aligned carbon nanotubes (CNTs) embedded in a polyimide substrate was designed, fabricated and used for the first time to accelerate protons and C ions by interaction with a sub-nanosecond, high power laser beam (600 J energy and 300 ps pulse width) with peak intensity of about 3 × 1016 W/cm2 on target. Each target was 5 μm thick, and the composite material contained CNTs aligned in different directions in the substrate. The results obtained from the analysis of a Thomson Parabola spectrometer, and of the spots imprinted by ions on a series of PM355 nuclear track detectors, indicate high energies (up to 3 MeV for protons and 9 MeV for C ions) and a marked infl…