Search results for "Penn"
showing 10 items of 568 documents
Time Characteristics of the Ion Beam Cooler-Buncher at JYFL
2001
A beam cooler for low-energy ion beams was constructed to improve the ion optical properties of radioactive ion beams produced at the IGISOL facility in Jyvaskyla. The beam cooler is a buffer gas filled RF-quadrupole. The delay properties and the possibility to accumulate a continuous IGISOL beam and release it in short bunches is discussed.
Il canto e la memoria
2017
Il saggio prende le mosse dalle due "Canzoni natalizie etnee trascritte dalla memoria per 11 strumenti" op. 49 (1982-83) di Francesco Pennisi, analizzando la genesi, i retroscena autobiografici e i dettagli della struttura compositiva dei brani. Inoltre, vengono considerate le successive "apparizioni" della seconda canzone nell'ambito di altre composizioni per orchestra e per pianoforte. In appendice viene inoltre pubblicata, oltre a tre lettere inedite del compositore, anche il manoscritto autografo di "Un Pastorale etnea" (1995) che riprende la melodia di 'Na nuttata tanta ranni.
International competitiveness, job creation and job destruction—An establishment-level study of German job flows
2010
Abstract This study investigates the impact of international competitiveness on net employment, job creation, job destruction, and gross job flows for a representative sample of German establishments from 1993 to 2005. We find a statistically significant but economically small effect of real exchange rate shocks on employment, comparable to the one found in studies for the United States. However, contrary to the United States, the employment adjustment (among surviving firms) operates mainly through the job creation rather than the job destruction rate. Job destruction occurs essentially through discrete events such as restructuring, outsourcing and bankruptcy. We suggest that these finding…
Building relational worth in an online social community through virtual structural embeddedness and relational embeddedness
2021
Abstract This research explores the creation of relational worth in an online social community through the lens of social capital theory. Virtual structural embeddedness and relational embeddedness as dimensions of social capital are assessed through the concepts of media dependency and parasocial interaction. Both constructs are regarded as antecedents of relational worth in online social communities, which develops through their users’ self-connection to the community. To test the proposed conceptual model an analysis was undertaken of data from 370 personal interviews with online social community users. The results showed that structural and relational embeddedness are both associated wi…
The relationship between knowledge search strategies and absorptive capacity: A deeper look
2016
Abstract The present study analyzes how the breadth and depth of search strategies affect the dimensions of a firm's absorptive capacity: exploration, transformation and exploitation. Results of an analysis of a sample of 467 Spanish manufacturing firms reveal that openness of external knowledge search contributes to firms' exploratory, transformative and exploitative learning processes in different ways. In particular, a strong curvilinear effect of external knowledge search breadth on exploratory and exploitative learning was found. It is also important to establish deep relationships with external agents to achieve transformative and exploitative learning up to a certain point after whic…
A Barrier Framework for open E-Learning in public administrations
2015
A comprehensive literature review on E-Learning and OER in public administrations.A contextualized Barrier Framework about core barriers in the public sector.Lessons learned to improve implementation and adoption processes of open E-Learning.The relevance of organizational, social and technical barriers in the public sector. E-Learning and openness in education are receiving ever increasing attention in businesses as well as in academia. However, these practices have only to small extent been introduced in public administrations. The study addresses this gap by presenting a literature review on Open Educational Resources OER and E-Learning in the public sector. The main goal of the article …
Physical environment as a source for innovation: investigating the attributes of innovative space
2013
Purpose – The purpose of this paper is to investigate how physical spaces intersect with innovation and innovativeness, and what the most relevant attributes of physical space are for innovation. Design/methodology/approach – The paper reflects the changing nature of innovation, from technological advancements to services and meaning changes, and argues that the development of innovative spaces similarly embodies a diverse set of values such as collaboration, openness, and sustainability. Using a literature review, interviews, and benchmarking data, the paper examines the relationship between physical environment and innovation. Findings – The findings from both the literature review and t…
Why Do Teachers Use Game-Based Learning Technologies? The Role of Individual and Institutional ICT Readiness
2015
This paper investigates how different individual and institutional factors pertaining to ICT readiness influence teachers’ adoption of game-based learning technologies. The data were gathered from Finnish primary, lower secondary and upper secondary school teachers (N=1668) with an online survey. The results indicate that openness towards ICT, ICT attitude and the ICT compatibility with teaching positively influence the perceived value whereas openness towards ICT, supportive organizational ICT culture, ICT selfefficacy and ICT compatibility with teaching positively influenced the actual use of game-based learning technologies. However, the structural model could explain only little of the …
Accelerating Radioactive Ion Beams With REX-ISOLDE
2003
The post accelerator REX‐ISOLDE is installed at the ISOLDE facility at CERN, where a broad variety of radioactive ions can be addressed. Since the end of 2001 beams at the final energy of 2.2 MeV/u are available. REX‐ISOLDE uses a unique system of beam bunching and charge breeding. First a Penning trap accumulates and bunches the ions, which are delivered as a quasi‐continuous beam from the ISOLDE target‐ion‐source, and then an electron beam ion source (EBIS) charge‐breeds them to a mass‐to‐charge ratio below 4.5. This enables a very compact design for the following LINAC, consisting of a 4 rod RFQ, an IH structure and three 7‐gap‐resonators. The later ones allow a variation of the final en…
The Inchworm as a precision translator in a high magnetic field and UHV environment
1989
Abstract A new set-up has been designed and tested for on-line, high-precision mass measurements of short-lived radioactive isotopes via a determination of the ion cyclotron resonance. Ions delivered by the on-line isotope separator ISOLDE at CERN/Geneva are stored in a Penning trap installed in a superconducting solenoid. Due to severe space limitations in the bore of the solenoid, it is impossible to use conventional mechanical feedthroughs for the necessary manipulations inside the uhv chamber. Instead, a number of Inchworms, a high-precision positioning device based on the piezo-electric effect are employed. This publication reports on the first application of this device in a uhv envir…