Search results for "Citation"

Assessment of Researchers Through Bibliometric Indicators: The Area of Information and Library Science in Spain as a Case Study (2001–2015)

2018

Research activities are subject to constant processes of evaluation, which increasingly include the use of bibliometric indicators to support decision-making. This paper presents a model for the individual evaluation of different facets of researchers' work and discusses the interest in using “control” parameters to identify deviations suggesting inappropriate conduct. The proposed model is illustrated through an empirical example that analyzes the activity of Spanish researchers in the area of Library and Information Science. There are important differences among the most productive authors, and in many cases, there is no association between the degree of participation in high-impact journ…

Regional Systems of Innovation: a Literature Review

2012

Though various authors have offered reviews of the Regional Innovation Systems (RIS) literature and some have described their personal intellectual voyage amongst the building blocks that constitute this area of scientific enquiry (for example, Cooke 2008), these often illuminating illustrations are nonetheless subjective and, thus, suffer from biases which pertain to the actor performing the analysis. The study proposed in this paper aims to overcome the aforementioned limitation by elaborating an objective review of the main contributions to the RIS field of research, highlighting the main themes studied and the principal approaches followed. The analysis has been conducted following the …

Penning-trap-assisted study of excitations in $^{88}$Br populated in β decay of $^{88}$Se

2017

Excited levels of 88Br populated in the β decay of 88Se have been studied by means of βγ and γ γ spectroscopy methods. Neutron-rich parent 88Se nuclei were produced with proton-induced fission of 238U using the Ion Guide Isotope Separator On-Line (IGISOL) method and separated from contaminants using a dipole magnet and the coupled JYFLTRAP Penning trap at the Accelerator Laboratory of the University of Jyvaskyl ¨ a. The level scheme ¨ of 88Br has been constructed and log f t values of levels were determined. The ground-state spin of 88Br is now firmly determined to be 1−. Low-energy levels in 88Br were interpreted as members of the πp3/2(νd5/2) 3, πp−1 3/2(νd5/2) 3, πf −1 5/2 (νd5/2) 3, and…

Latvijas zinātnieku produktivitāte medicīnas nozarē

2017

Maģistra darba tēma ir “Latvijas zinātnieku produktivitāte medicīnas nozarē”. Svarīgi gūt nepieciešamo finansējumu pētījumu veikšanai, zinātniskās publikācijas publicēt starptautiski atzītos zinātniskajos medicīnas nozares izdevumos, lai kvalitatīvāk iekļautos Eiropas pētniecības telpā. Mērķis: noteikt Latvijas zinātnieku produktivitāti medicīnas nozarē, tās vietu Baltijā, citu zinātnes nozaru vidū Latvijā, kuras medicīnas apakšnozares ir produktīvākās. Teorētisko bāzi veido metateorija pragmatisms un citēšanas teorija. Pētījumam izvēlēta kvantitatīvā stratēģija. Metodes: bibliometrija un tās virziens – citēšanas analīze. Rezultāti parāda, ka Latvijas zinātnieku produktivitātes palielināšan…

Indexations et diffusions internationales de Synergies Algérie, revue du Gerflint : état des lieux en 2018

2018

Toute étude prenant pour objet la revue Synergies Algérie place auteurs, chercheurs et lecteurs dans l’un des centres les plus productifs de la francophonie scientifique internationale en sciences humaines et sociales. Le nombre élevé et la diversité de ses indexations depuis sa fondation en 2007 ainsi que la qualité de la diffusion de ses articles en témoignent. À la frontière éditoriale entre le 26e numéro et le 27e , cette contribution offre un bilan de ces reconnaissances et de cette visibilité désormais inscrites dans la durée, permettant d’envisager un avenir prometteur. La d&…

Excitation energy transfer in isolated chlorosomes from Chloroflexus aurantiacus

2009

Abstract Chlorosomes from green photosynthetic bacteria Chloroflexus aurantiacus have been studied by time-resolved femtosecond transient absorption spectroscopy. The fastest kinetics of 200–300 fs resolved, was interpreted to stem for intra-chlorosomal excitation energy transfer. Energy transfer from the antenna to the baseplate appeared as a major 9.2 ps rise component detected at the baseplate probe wavelength. Excitation energy transfer rates were evaluated for a model chlorosome. Calculated rod to rod, and rods to baseplate rate constants of 200–400 fs and 10–20 ps, respectively, are in accord with the experimental results.

Excitation Energy Transfer in Isolated Chlorosomes from Chlorobaculum tepidum and Prosthecochloris aestuarii

2012

Excitation energy transfer in chlorosomes from photosynthetic green sulfur bacteria, Chlorobaculum (Cba.) tepidum and Prosthecochloris (Pst.) aestuarii, have been studied at room temperature by time-resolved femtosecond transient absorption spectroscopy. Bleach rise times from 117 to 270 fs resolved for both chlorosomes reflect extremely efficient intrachlorosomal energy transfer. Bleach relaxation times, from 1 to 3 ps and 25 to 35 ps, probed at 758 nm were tentatively assigned to intrachlorosomal energy transfer based on amplitude changes of the global fits and model calculations. The anisotropy decay constant of about 1 ps resolved at 807 nm probe wavelength for the chlorosomes from Chlo…

Charge Transfer Transitions in Neutral and Ionic Polypeptides:  A Theoretical Study

2001

We report on the vertical electronic excitation spectra of neutral polypeptides and their radical ions. Model systems including tri-, tetra-, and octamers in an α-helix and β-sheet alike conformation are studied by various computational methods. The results allow us to assign the band centered at about 7.5 eV in the absoption spectra of proteins to charge transfer states. The calculations also support conclusions from recent experiments which propose charge transfer as a possible mechanism for photoinduced electron transfer in polypeptide cations.

Friedrich Wilhelm Ahnefeld

2013

Microspectroscopy and spectromicroscopy with photoemission electron microscopy using a new kind of imaging energy filter

2001

The use of an imaging retarding field analyser attached to the FOCUS IS-PEEM is described. This kind of energy filter is a simple, powerful tool to obtain microspectra from areas of down to about 1 μm using (V)UV and X-ray excitation sources. First results of microspectroscopy measured by excitation with a laboratory as well as a synchrotron X-ray source are presented.