Conjunctive query inseparability of OWL 2 QL TBoxes

The OWL2 profile OWL 2 QL, based on the DL-Lite family of description logics, is emerging as a major language for developing new ontologies and approximating the existing ones. Its main application is ontology based data access, where ontologies are used to provide background knowledge for answering queries over data. We investigate the corresponding notion of query inseparability (or equivalence) for OWL 2 QL ontologies and show that deciding query inseparability is PSpace-hard and in ExpTime. We give polynomial-time (incomplete) algorithms and demonstrate by experiments that they can be used for practical module extraction

Electrical conductance of molecular junctions by a robust statistical analysis

We propose an objective and robust method to extract the electrical conductance of single molecules connected to metal electrodes from a set of measured conductance data. Our method roots in the physics of tunneling and is tested on octanedithiol using mechanically controllable break junctions. The single molecule conductance values can be deduced without the need for data selection.Comment: 4 figure

Cleavage of the Oxanorbornene Oxygen Bridge with Lewis Acids: Computation and Experiment

Since the discovery of the biological activity of aminophosphonates, research started on the synthesis of more constraint azaheterocyclic phosphonates. We developed a route via an intramolecular Diels-Alder reaction towards α-aminophosphonates 1. [1] The obtained oxanorbornene skeleton is a valuable synthetic intermediate that has been used in various natural product syntheses. [2] An important synthetic transformation involves the cleavage of the oxygen bridge, used to construct substituted arenes and cyclohexenes. We wanted to investigate the ring opening of adducts 1 using different Lewis acids experimentally and get more insight in the reaction pathways towards the different products via computational experiments. In this presentation the results obtained with TiCl4 and FeCl3 catalyst are shown. The computational study started with the catalysts and their multiplicity. Next, the complexation energy with different binding sites was calculated. Therefore, a level of theory study was done using an ONIOM QM/QM approach. This shows the importance of the inclusion of electron correlation effects. B3LYP geometries and energies can be used as a good approximation. Bidentate coordination towards the most electronegative phosphonate oxygen and the oxygen bridge is favoured for both catalysts. Then, different reaction pathways were investigated via a static, gas-phase approach. The energy barrier towards the transition state using the TiCl4 catalyst, shown in Figure 1, is much lower than for the FeCl3 catalyst and very different products are formed. The computational results were compared with the experiments

Pengelolaan Dana Kelurahan Dengan Perspektif Community Driven Development di Kelurahan Kladufu Kota Sorong

Tujuan penelitian untuk mengetahui efektifitas pengelolaan dana kelurahan melalui perspektif Community Driven Development. Peneliti menggunakan metode kualitatif dengan teknik analisis triangulasi. Untuk mendapatkan data yang akurat dari informan, maka dilakukan Observasi dan wawancara. Informan dalam penelitian ini adalah perangkat kelurahan yaitu lurah, sekretaris kelurahan, dan perwakilan RT, dengan jumlah informan sebanyak 5 orang yang ditentukan dengan menggunakan teknik purposive sampling. Hasil penelitian menujukan bahwa pengelolaan dana kelurahan masih berfokus pada program fisik dan belum berfokus pada pengembangan pemberdayaan masyarakat. Program yang dilaksanakan masih merupakan program dari pemerintah kota Sorong, Belum seutuhnya berfokus kepada masyarakat, dimana program yang berdampak pada kesejahteraan masyarakat belum dilaksanakan, seperti pengembangan UMKM. Perencanaan dan perancangan dilakukan sepenuhnya oleh perangkat kelurahan. Wewenang kontrol atas sumberdaya terkait pengelolaan dana kelurahan masih sepenuhnya ditangan pemerintah kelurahan sedangkan masyrakat tidak memiliki wewenang kontrol atas sumber daya. Masyarakat dilibatkan hanya sebagai pekerja dalam pelaksanaan program pengeloalan dana kelurahan dan bukan dilibatkan secara luas dalam pengelolaan secara manajemen. Monitoring dan evaluasi dilakukan oleh pemerintah distrik (kecamatan) dan pemerintah kota Soron

School Social Fragmentation, Economic Deprivation and Social Cohesion and Adolescent Physical Inactivity: A Longitudinal Study

Objectives: To examine the independent influence of school economic deprivation, social fragmentation, and social cohesion on the likelihood of participating in no physical activity among students. Methods: Data are from a large-scale longitudinal study of schools based in disadvantaged communities in Quebec, Canada. Questionnaires were administered every year between 2002 and 2008 among n = 14,924 students aged 12 to 18 from a sample of 70 schools. Cross-sectional and longitudinal analyses were conducted. Multilevel modeling was utilized to account for the clustering of students within schools. Schools were categorized as being low, moderate or high economic deprivation, social fragmentation and social cohesion. Those who indicated that they do no participate in any physical activity during the week were identified as being physically inactive. Results: In baseline multilevel cross-sectional analyses, adolescents attending schools in the highest (compared to the lowest) levels of socioeconomic deprivation and social fragmentation were more likely to be physically inactive (OR = 1.33, 95% CI = 1.03, 1.72; and OR = 1.24, 95% CI = 0.98, 1.56, respectively). Conversely, students attending schools with the highest cohesion were less likely to be physically inactive (OR = 0.78, 95% CI = 0.61, 0.99). In longitudinal analysis, physically active students who attended schools with the highest social fragmentation were more likely to become physically inactive over two years (OR = 1.65, 95% CI = 1.09, 2.51). Conclusion: The school socioeconomic environment appears to be an important contextual influence on participation in no physical activity among adolescents. Following adolescents beyond two years is necessary to determine if these environments have a lasting effect on physical activity behavior