Revista Brasileira De Zootecnia-brazilian Journal of Animal Science, 2003
Sixty crossbred piglets, with average initial weight of 15.1 ± 0.50 kg and 56 ± 3.6 days old were... more Sixty crossbred piglets, with average initial weight of 15.1 ± 0.50 kg and 56 ± 3.6 days old were used to evaluate the dietary crude protein levels, for barrows in the initial growing phase, under low temperature environment (15ºC). The animals were allotted to a randomized blocks design, with five treatments, six replications and two animals per experimental unit. The treatments consisted of diets with 17.0, 18.0, 19.0, 20.0, and 21.0% crude protein (CP). The dietary crude protein levels affected daily weight gain, that increased in a quadratic way up to 19.6%. Feed:gain ratio also changed in a quadratic way, increasing up to 20.0%. Daily feed and digestible energy intakes were not influenced by the treatments. The best fit was obtained with the LRP discontinuous model, which estimated the crude protein level at 20%, when the data reached a plateau. The treatments influenced the protein deposition rate, that increased linearly, while the fat deposition rate did not change. It was concluded that the dietary crude protein level of 20.0%, associated to a daily intake of 10.7g total lysine, showed the best results of performance for barrows from 15 to 30 kg, under low temperature environment.
Many systems, ranging from engineering to medical to societal, can only be properly characterized... more Many systems, ranging from engineering to medical to societal, can only be properly characterized by multiple interdependent networks whose normal functioning depends on one another. Failure of a fraction of nodes in one network may lead to a failure in another network. This in turn may cause further malfunction of additional nodes in the first network and so on. Such a cascade of failures, triggered by a failure of a small faction of nodes in only one network, may lead to the complete fragmentation of all networks. We introduce a model and an analytical framework for studying interdependent networks. We obtain interesting and surprising results that should significantly effect the design of robust real-world networks. For two interdependent Erdos-Renyi (ER) networks, we find that the critical average degree below which both networks collapse is <k_c>=2.445, compared to <k_c>=1 for a single ER network. Furthermore, while for a single network a broader degree distribution of the network nodes results in higher robustness to random failure, for interdependent networks, the broader the distribution is, the more vulnerable the networks become to random failure.
Hydrodynamical simulations are presented of a pulsar wind emitted by a supersonically moving puls... more Hydrodynamical simulations are presented of a pulsar wind emitted by a supersonically moving pulsar. The pulsar moves through the interstellar medium or, in the more interesting case, through the supernova remnant created at its birth event. In both cases there exists a three-fold structure consisting of the wind termination shock, contact discontinuity and a bow shock bounding the pulsar wind nebula. Using hydrodynamical simulations we study the behaviour of the pulsar wind nebula inside a supernova remnant, and in particular the interaction with the outer shell of swept up interstellar matter and the blast wave surrounding the remnant. This interaction occurs when the pulsar breaks out of the supernova remnant. We assume the remnant is in the Sedov stage of its evolution. Just before break-through, the Mach number associated with the pulsar motion equals Mpsr = 7/sqrt {5}, independent of the supernova explosion energy and pulsar velocity. The bow shock structure is shown to survive this break-through event.
Revista Brasileira De Zootecnia-brazilian Journal of Animal Science, 2003
Sixty crossbred piglets, with average initial weight of 15.1 ± 0.50 kg and 56 ± 3.6 days old were... more Sixty crossbred piglets, with average initial weight of 15.1 ± 0.50 kg and 56 ± 3.6 days old were used to evaluate the dietary crude protein levels, for barrows in the initial growing phase, under low temperature environment (15ºC). The animals were allotted to a randomized blocks design, with five treatments, six replications and two animals per experimental unit. The treatments consisted of diets with 17.0, 18.0, 19.0, 20.0, and 21.0% crude protein (CP). The dietary crude protein levels affected daily weight gain, that increased in a quadratic way up to 19.6%. Feed:gain ratio also changed in a quadratic way, increasing up to 20.0%. Daily feed and digestible energy intakes were not influenced by the treatments. The best fit was obtained with the LRP discontinuous model, which estimated the crude protein level at 20%, when the data reached a plateau. The treatments influenced the protein deposition rate, that increased linearly, while the fat deposition rate did not change. It was concluded that the dietary crude protein level of 20.0%, associated to a daily intake of 10.7g total lysine, showed the best results of performance for barrows from 15 to 30 kg, under low temperature environment.
Many systems, ranging from engineering to medical to societal, can only be properly characterized... more Many systems, ranging from engineering to medical to societal, can only be properly characterized by multiple interdependent networks whose normal functioning depends on one another. Failure of a fraction of nodes in one network may lead to a failure in another network. This in turn may cause further malfunction of additional nodes in the first network and so on. Such a cascade of failures, triggered by a failure of a small faction of nodes in only one network, may lead to the complete fragmentation of all networks. We introduce a model and an analytical framework for studying interdependent networks. We obtain interesting and surprising results that should significantly effect the design of robust real-world networks. For two interdependent Erdos-Renyi (ER) networks, we find that the critical average degree below which both networks collapse is <k_c>=2.445, compared to <k_c>=1 for a single ER network. Furthermore, while for a single network a broader degree distribution of the network nodes results in higher robustness to random failure, for interdependent networks, the broader the distribution is, the more vulnerable the networks become to random failure.
Hydrodynamical simulations are presented of a pulsar wind emitted by a supersonically moving puls... more Hydrodynamical simulations are presented of a pulsar wind emitted by a supersonically moving pulsar. The pulsar moves through the interstellar medium or, in the more interesting case, through the supernova remnant created at its birth event. In both cases there exists a three-fold structure consisting of the wind termination shock, contact discontinuity and a bow shock bounding the pulsar wind nebula. Using hydrodynamical simulations we study the behaviour of the pulsar wind nebula inside a supernova remnant, and in particular the interaction with the outer shell of swept up interstellar matter and the blast wave surrounding the remnant. This interaction occurs when the pulsar breaks out of the supernova remnant. We assume the remnant is in the Sedov stage of its evolution. Just before break-through, the Mach number associated with the pulsar motion equals Mpsr = 7/sqrt {5}, independent of the supernova explosion energy and pulsar velocity. The bow shock structure is shown to survive this break-through event.
Uploads
Papers by Rony Dias