410 research outputs found
Repulsive Casimir force between silicon dioxide and superconductor
We have presented a detailed investigation of the Casimir interaction between
the superconductor Bi2Sr2CaCu2O8+{\delta} (BSCCO) and silicon dioxide with the
presence of bromobenzene in between. We found the dispersion force is repulsive
and the magnitude of the force can be changed by varying the thickness of
object and temperature. The repulsive force would provide a method to deal with
the stiction problems and bring much meaningful from practical views.Comment: 3 pages, 2 figure
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Improving tag recommendation using social networks
In this paper we address the task of recommending additional tags to partially annotated media objects, in our case images. We propose an extendable framework that can recommend tags using a combination of different personalised and collective contexts. We combine information from four contexts: (1) all the photos in the system, (2) a user's own photos, (3) the photos of a user's social contacts, and (4) the photos posted in the groups of which a user is a member. Variants of methods (1) and (2) have been proposed in previous work, but the use of (3) and (4) is novel.
For each of the contexts we use the same probabilistic model and Borda Count based aggregation approach to generate recommendations from different contexts into a unified ranking of recommended tags. We evaluate our system using a large set of real-world data from Flickr. We show that by using personalised contexts we can significantly improve tag recommendation compared to using collective knowledge alone. We also analyse our experimental results to explore the capabilities of our system with respect to a user's social behaviour
Glutamine-enriched enteral nutrition in very low birth weight infants, six years of follow-up
Fetter, W.P.F. [Promotor]Elburg, R.M. van [Copromotor
Repulsive Casimir forces between solid materials with high refractive index intervening liquids
In order to explore repulsive Casimir/van der Waals forces between solid
materials with liquid as the intervening medium, we analyze dielectric data for
a wide range of materials as for example PTFE, polystyrene, silica and more
than twenty liquids. Although significant variation in the dielectric data from
different sources exist, we provide a scheme based on measured static
dielectric constants, refractive indices, and applying Kramers Kronig (KK)
consistency to dielectric data to create accurate dielectric functions at
imaginary frequencies. The latter is necessary for more accurate force
calculations via the Lifshitz theory allowing reliable predictions of repulsive
Casimir forces.Comment: 20 pages, 7 figures, 1 tabl
Interspecific competition among juvenile salmonids: social behaviour and HORMONE LEVELS OF ATLANTIC SALMON AND TWO NON-NATIVE TROUT SPECIES
Competition with ecologically similar non-native salmonids may hinder efforts to restore Atlantic salmon (Salmo salar) in Lake Ontario. I examined the competitive effects of juvenile brown trout (S. truttci) and rainbow trout (Oncorhynchus mykiss), two non-native competitors, on aggression, dominance, growth, and hormone concentrations of three candidate strains of juvenile Atlantic salmon selected for réintroduction into Lake Ontario. Interspecific competition in semi-natural streams reduced aggression, dominance, and growth of Atlantic salmon, coincident with increasing concentrations of cortisol, a hormone that functions in part in the stress response. An aggression-associated hormone, 11-ketotestosterone, was largely unaffected. Interestingly, the most ecologically similar competitor, rainbow trout, had less impact on Atlantic salmon behaviour and growth, relative to brown trout. Atlantic salmon from Lac Saint-Jean were least affected, implicating genetic differences among strains and specific management recommendations. This study highlights the necessity of competition experiments to understand how competition may influence restoration of extirpated populations
A framework for future training in marine and coastal protected area management
Training, Protected areas, Marine environment, Coastal zone management
Combining Concept- with Content-based Multimedia Retrieval
The arrival of the XML standard opened new doors for structured document search. Common approach in XML retrieval is to directly exploit the documents structure. However this is likely to fail for two reasons. First of all, it neglects the rich multimedia character of documents on the Internet, where a wide variety of multimedia objects can be found such as text, images and streaming video. Secondly, using the document structure as the basis for searching the content of a document can easily lead to semantical misinterpretation of the document's content. This chapter discusses an approach for searching rich multimedia document collections, that tackles these two problems using a combination of conceptual search and content-based retrieval
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