A compactness theorem for complete Ricci shrinkers

We prove precompactness in an orbifold Cheeger-Gromov sense of complete gradient Ricci shrinkers with a lower bound on their entropy and a local integral Riemann bound. We do not need any pointwise curvature assumptions, volume or diameter bounds. In dimension four, under a technical assumption, we can replace the local integral Riemann bound by an upper bound for the Euler characteristic. The proof relies on a Gauss-Bonnet with cutoff argument.Comment: 28 pages, final version, to appear in GAF

Pointwise characterizations of curvature and second fundamental form on Riemannian manifolds

Let $M$ be a complete Riemannian manifold possibly with a boundary \pp M. For any $C^1$-vector field $Z$, by using gradient/functional inequalities of the (reflecting) diffusion process generated by L:=\DD+Z, pointwise characterizations are presented for the Bakry-Emery curvature of $L$ and the second fundamental form of \pp M if exists. These extend and strengthen the recent results derived by A. Naber for the uniform norm \|\Ric_Z\|_\infty on manifolds without boundary. A key point of the present study is to apply the asymptotic formulas for these two tensors found by the first named author, such that the proofs are significantly simplified

data.europeana.eu - The Europeana Linked Open Data Pilot

data.europeana.eu is an ongoing effort of making Europeana metadata available as Linked Open Data on the Web. It allows others to access metadata collected from Europeana data providers via standard Web technologies. The data are represented in the Europeana Data Model (EDM) and the described resources are addressable and dereferencable by their URIs. Links between Europeana resources and other resources in the Linked Data Web will enable the discovery of semantically related resources. We developed an approach that allows Europeana data providers to opt for their data to become Linked Data and converts their metadata to EDM, benefiting from Europeana efforts to link them to semantically related resources on the Web. With that approach, we produced a first Linked Data version of Europeana and published the resulting datasets on the Web. We also gained experiences with respect to EDM, HTTP URI design, and RDF store performance and report them in this paper

Europeana Linked Open Data -- data.europeana.eu

Europeana is a single access point to millions of books, paintings, films, museum objects and archival records that have been digitized throughout Europe. The data.europeana.eu Linked Open Data pilot dataset contains open metadata on approximately 2.4 million texts, images, videos and sounds gathered by Europeana. All metadata are released under Creative Commons CC0 and therefore dedicated to the public domain. The metadata follow the Europeana Data Model and clients can access data either by dereferencing URIs, downloading data dumps, or executing SPARQL queries against the dataset. They can also follow the links to external linked data sources, such as the Swedish cultural heritage aggregator (SOCH), GeoNames, the GEMET thesaurus, or DBPedia. © 2012 - IOS Press and the authors. All rights reserved

El "Idealismo" de Santo Tomás de Aquino

The use of widely-used metadata standards is essential to guarantee the visibility and retrieval of documents stored in open repositories. Attention should be paid to the creation and exchange of meaningful metadata to enhance interoperability amongst repositories and provide value added services. Since 2005 the Food and Agriculture Organization of the United Nations (FAO) provides the agricultural information management com-munity with standards, services and tools to assist open reposito-ries in benefiting from the advantages offered by Semantic Web publishing. This paper presents the work that FAO carries out in recommending standards for the encoding and exchange of metadata while also reviewing techniques to help navigate within open repositories and services. It talks about how to improve the visibility of repository content and explains the benefits of inte-grating subject vocabulary tools expressed in SKOS. It concludes with a presentation of use cases integrating these recommenda-tions into DSpace and Drupal customizations