On the r−r-stability of spacelike hypersurfaces

In this paper we study the strong stability of spacelike hypersurfaces with constant $r$-th mean curvature in Generalized Robertson-Walker spacetimes of constant sectional curvature. In particular, we treat the case in which the ambient spacetime is the de Sitter space

Crossbreeding and new beef cattle breeds in Brazil.

Crossbreeding and new beef cattle breeds in Brazil.198

Efeito do teor proteíco do concentrado no consumo de cana-de-açúcar com uréia e ganho de peso de novilhas em crescimento.

O efeito de diferentes suplementos proteicos no consumo de cana-de-acucar com ureia foi avaliado em novilhas mesticas de Holandes-Zebu , durante a estacao seca. Dezoito novilhas com peso medio inicial de 288kg e idade variando entre 15 a 22 meses foram suplementados com farelo de soja ou com concentrado contendo 28,7% de proteina bruta.\

Caracterização molecular de Potyvirus que infectam maracujazeiro (Passiflora sp.) no estado da Bahia.

Inúmeras doenças afetam a cultura do maracujazeiro no Brasil, causando grandes prejuízos de ordem econômica, sendo que a virose do endurecimento dos frutos é uma das mais limitantes à produção. Essa doença sempre esteve associada a uma única espécie de Potyvirus, o Passionfruit woodiness virus (PWV). Porém, estudos conduzidos ao longo dos anos demonstraram que mais duas espécies de Potyvirus, o Cowpea aphid-borne mosaicvirus (CABMV) e o East asian passiflora virus (EAPV) também podem causar a mesma doença

Robustness of bipartite Gaussian entangled beams propagating in lossy channels

Subtle quantum properties offer exciting new prospects in optical communications. Quantum entanglement enables the secure exchange of cryptographic keys and the distribution of quantum information by teleportation. Entangled bright beams of light attract increasing interest for such tasks, since they enable the employment of well-established classical communications techniques. However, quantum resources are fragile and undergo decoherence by interaction with the environment. The unavoidable losses in the communication channel can lead to a complete destruction of useful quantum properties -- the so-called "entanglement sudden death". We investigate the precise conditions under which this phenomenon takes place for the simplest case of two light beams and demonstrate how to produce states which are robust against losses. Our study sheds new light on the intriguing properties of quantum entanglement and how they may be tamed for future applications.Comment: To be published - Nature Photonic