Search results for "abs"
showing 10 items of 6504 documents
Biased graph walks for RDF graph embeddings
2017
Knowledge Graphs have been recognized as a valuable source for background information in many data mining, information retrieval, natural language processing, and knowledge extraction tasks. However, obtaining a suitable feature vector representation from RDF graphs is a challenging task. In this paper, we extend the RDF2Vec approach, which leverages language modeling techniques for unsupervised feature extraction from sequences of entities. We generate sequences by exploiting local information from graph substructures, harvested by graph walks, and learn latent numerical representations of entities in RDF graphs. We extend the way we compute feature vector representations by comparing twel…
Molecule-like photodynamics of Au102(pMBA)44 nanocluster.
2015
Photophysical properties of a water-soluble cluster Au102(pMBA)44 (pMBA = para-mercaptobenzoic acid) are studied by ultrafast time-resolved mid-IR spectroscopy and density functional theory calculations in order to distinguish between molecular and metallic behavior. In the mid-IR transient absorption studies, visible or near-infrared light is used to electronically excite the sample, and the subsequent relaxation is monitored by studying the transient absorption of a vibrational mode in the ligands. Based on these studies, a complete picture of energy relaxation dynamics is obtained: (1) 0.5-1.5 ps electronic relaxation, (2) 6.8 ps vibrational cooling, (3) intersystem crossing from the low…
Electronic Structure and Optical Properties of the Intrinsically Chiral 16-Electron Superatom Complex [Au20(PP3)4]4+
2014
The recently solved crystal structure of the [Au20(PP3)4]Cl4 cluster (PP3: tris(2-(diphenylphophino)ethyl)phosphine) is examined using density functional theory (DFT). The Au20 core of the cluster is intrinsically chiral by the arrangement of the Au atoms. This is in contrast to the chirality of thiolate-protected gold clusters, in which the protecting Au-thiolate units are arranged in chiral patterns on achiral cores. We interpret the electronic structure of the [Au20(PP3)4]Cl4 cluster in terms of the superatom complex model. The 16-electron cluster cannot be interpreted as a dimer of 8-electron clusters (which are magic). Instead, a superatomic electron configuration of 1S(2) 1P(6) 1D(6) …
A DFT Study of Linear Gold–Thiolate Superclusters Absorbing in the Therapeutic NIR Window
2015
A series of linear clusters up to an aspect ratio of 1:6, formed as multimers of smaller clusters with an icosahedral Au13(5+) core having an eight-electron superatom configuration, are computationally predicted to have a greatly enhanced size-dependent absorption in the near-infrared (NIR) region extending to the biologically important NIR window. A novel structural model is presented for the previously isolated thiol-stabilized Au54(SR)30 cluster, where the metal core is formed as a heterodimer of the cores of the known Au25(SR)18(-/0) and Au38(SR)24 clusters.
Estimating Regional Input Coefficients and Multipliers: The Use of FLQ is Not a Gamble
2014
Flegg A. T. and Tohmo T. Estimating regional input coefficients and multipliers: the use of FLQ is not a gamble, Regional Studies. This paper re-examines the Finnish evidence presented by Lehtonen and Tykkylainen on the use of location quotients (LQs) in estimating regional input coefficients and multipliers. They argue that the choice of an LQ-based method is a gamble and that there is no single method that can be recommended for general use. It is contended here that this evidence is erroneous and that the FLQ (Flegg's location quotient) yields results far superior to those from competing formulae, so it should provide a satisfactory way of generating an initial set of input coefficients.…
Does innovativeness reduce startup survival rates?
2015
There are two competing hypotheses explaining how innovativeness influences the survival of startups: On the one hand, innovativeness is argued to foster survival-enhancing attributes (e.g., market power and cost efficiency) and capabilities (e.g., absorptive capacity). On the other hand, an innovative startup faces (and bears the associated risks of) liabilities of newness and smallness that exceed those of its non-innovative counterparts. The available empirical literature addressing this theoretical tension mostly supports the former hypothesis; we suggest that this finding is, in part, driven by the common practice of employing an ex post measure that already embodies a degree of succes…
Motown, Disco, and Drumming : An Exploration of the Relationship Between Beat Salience, Melodic Structure, and Perceived Tempo
2019
In a study of tempo perception, London, Burger, Thompson, and Toiviainen (2016) presented participants with digitally ‘‘tempo-shifted’’ R&B songs (i.e., sped up or slowed down without otherwise altering their pitch or timbre). They found that while participants’ relative tempo judgments of original versus altered versions were correct, they no longer corresponded to the beat rate of each stimulus. Here we report on three experiments that further probe the relation(s) between beat rate, tempo-shifting, beat salience, melodic structure, and perceived tempo. Experiment 1 is a replication of London et al. (2016) using the original stimuli. Experiment 2 replaces the Motown stimuli with disco mus…
The Territorial Dimension of Living Lab Approaches: Starting the European “Participant Observatory”
2011
Territory production can be intended as any process of spatial transformation deriving from a sustainable and reciprocal dialogue between local communities and their spatial context along history time; the territory is a dynamic but durable balance between human settlements and their environments. Territory intended in this way - maybe the major competitive factor of regions and their economic actors too - depends less on merely technological advances, rather than socio-technical innovations able to generate better life quality in cities and regions. This is why in the CIP project “Periphèria”, started in November 2010, a European Observatory of LLs and Smart Cities will be set up, conceive…
Participatory planning in Palermo for social innovation and technologic enhancement. A living Lab territorial game toward city plan
2012
The approach that is offered by Living Labs, particularly for their territorial perspective, can represent one of the ways in which to set the transition from the stage of a “free game”, about scenarios and visions, to the definition of the plan social demand, specifically within the framework of a real experience of the citizenship life. In this sense, such an approach may represent the guarantee of an effectiveness of the plan. Despite the limits, which the previous failures represent, we can remark that through the dimension of openness, roles co-presence and competence of those stakeholders that are involved in Living Labs, the participation processes – from the perspective of a plannin…