Approximations of expressions of the form If := trace(W T f(A)W ), where A ∈ Rm×m is a large symmetric matrix, W ∈ Rm×k with k ≪ m, and f is a function, can be computed without evaluating f(A) by applying a few steps of the global block Lanczos method to A with initial block-vector W . This yields a partial global Lanczos decomposition of A. We show that for suitable functions f upper and lower...

The atom-bond connectivity (ABC) index is one of the most investigated degreebased molecular structure descriptors with a variety of chemical applications. It is known that among all connected graphs, the trees minimize the ABC index. However, a full characterization of trees with a minimal ABC index is still an open problem. By now, one of the proved properties is that a tree with a minimal AB...

The three primate species of Santa Rosa National Park, Costa Rica (Ateles geoffroyi, Alouatta palliata, Cebus capucinus) have diets in which fruits are major components. All three primate species defecated seeds of many fruiting species; the majority of which (60%) germinated under experimental conditions. The sampling of seed traps placed throughout he forest indicated that, on average, 392 la...

Ramón Zatarain-Cabada, Giner Alor-Hernández, María Lucía Barrón-Estrada, Ricardo Colomo-Palacios and Hao-Chiang Koong Lin Instituto Tecnológico de Culiacán, México // Instituto Tecnológico de Orizaba, México // Østfold University College, Norway // National Taipei University of Business, Taiwan // [email protected], [email protected] // [email protected] // ricardo.colomo...

Suárez, Jaime; Aispuro, Elvia; Carreño, Mónica; Sandoval, Andrés; Estrada, Italia; Hernández, Jesús; Aguilar, Javier; Valles, Yoshio; Ibarra, Emma E-Community: Mobile application for reporting incidents of public services of a city International Journal of Combinatorial Optimization Problems and Informatics, vol. 4, núm. 3, septiembre-diciembre, 2013, pp. 33-39 International Journal of Combinat...

Benjamin Habegger, Omar Hasan, Thomas Cerqueus, Lionel Brunie, Nadia Bennani, Harald Kosch, Ernesto Damiani 1 University of Lyon, CNRS, INSA-Lyon, LIRIS, UMR5205, F-69621, France {benjamin.habegger, omar.hasan, thomas.cerqueus, lionel.brunie, nadia.bennani}@insa-lyon.fr 2 Faculty of Informatics and Mathematics, University of Passau, Germany [email protected] 3 Department of Computer Te...

Neste texto pretende-se mostrar o movimento de tráfego que circulou pela Estrada Ferro Central da Bahia, no período 1865 a 1902. A estrada ferro partia Cachoeira e São Félix para interior com linha principal dirigida Chapada Diamantina um ramal, Feira Santana. empresa foi organizada inici- ativa privada, mas, posteriormente, teve ser encampada pelo governo federal. Apesar das dificuldades finan...