131,817 research outputs found
, 1428–1430 (1996)]
No full textWe have shown that adiabatic invariance is a consequence of the invariance of the functional under a certain rescaling of the time and space coordinates; as particular example, the adiabatic invariants of plasma physics are derived
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
[Conférence] “Script and the Shaping of History”, Brody Neuenschwander. Séminaire Carte blanche, séance n°2, mercredi 27 mars, 16h (INHA)
No full textSéminaire Carte blanche, séance n°2 "Script and the Shaping of History" Brody Neuenschwander en dialogue avec Karine Bouchy Le mercredi 27 mars à 16h INHA (salle Vasari) 2 Rue Vivienne, 75002 Paris La conférence se déroulera en anglais. Pour y assister, inscription obligatoire à l'adresse [email protected] : suite à votre inscription, vous recevrez un lien pour pouvoir visionner le documentaire L'Odyssée de l'écriture sur lequel portera la conférence. Les écritures manuscrites : le dessin d..
Laser machining of silicon with bursts of ultra-short laser pulses: Factors influencing the process efficiency and surface quality (Conference Presentation)
No full textFor silicon machined with 10 ps pulses at 1064nm it was found that the specific removal rate increases by a factor of about 2.5 when an 8-pulse burst is used instead of single pulses [1]. This increase in the specific removal rate directly scales with a higher surface roughness. For copper and a 3-pulse burst the absorptance of a machined surface increases to about 200% of the one obtained with single pulses [2]. This can serve as an explanation for the higher specific removal rate observed in this case [3]. Actual calorimetric measurements on silicon show that the fraction of the incoming energy which is converted to heat is almost independent on the number of pulses per burst (a behavior which was observed for copper too) and the absorptance depends on the number of pulses. However, as the observed variations in the absorptance are only in the order of a few % and do not monotonically increase with the number of pulses per burst the change in the absorptance cannot explain the increase in the specific removal rate for pulse bursts on silicon. Additional experiments including calorimetry with varying intra-burst time differences and pulse energies as well as experiments concerning reflectivity and transmission will help to understand this behavior of silicon.
[1] B. Jaeggi, D.J. Förster, B. Neuenschwander, OSA Technical Digest, CLEO (2018), AM1M.3
[2] B. Jaeggi, D. J. Foerster, R. Weber, B. Neuenschwander, Adv. Opt. Techn. 7, 175 (2018)
[3] B. Neuenschwander, B. Jaeggi, D.J. Foerster, Th. Kramer, S. Remund, to be published in Proc. of ICALEO (2018
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Probabilities on Simply Connected Nilpotent Lie Groups: On the Doeblin-Gnedenko Conditions for the Domain of Attraction of Stable Laws. With an Appendix on a New Proof of Siebert's Convergence Theorem for Generating Distributions
No full textThe classical Doeblin-Gnedenko conditions characterizing the domain of attraction of a non-Gaussian stable law have been proved to be sufficient for completely non-Gaussian stable continuous convolution semigroups (c.c.s. for short) on simply connected nilpotent Lie groups by Carnal [2]. His method was a translation of the extreme-value-theoretic approach due to Le Page, Woodroofe, Zinn [11]. In the present note, we give a generalization of the classical proof for the sufficiency of these conditions. Together with Neuenschwander
[13] this yields the fact that in case every eigenvalue of the square matrix A has real part strictly greater than 1/2, then for a completely non-Gaussian {tA}t>0-stable (in the not necessarily strict sense) semigroup on simply connected nilpotent Lie groups, the analogue of the Doeblin-Gnedenko conditions in fact characterize the non-strict {tA}t>0-domain of attraction. We take this opportunity to state a new proof of Siebert's Convergence Theorem for c.c.s. and their generating distributions for the special case of simply connected nilpotent Lie groups and related results
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