Aspects of CPT-even Lorentz-symmetry violating physics in a supersymmetric scenario

Background fermion condensates in a landscape dominated by global SUSY are reassessed in connection with a scenario where Lorentz symmetry is violated in the bosonic sector (actually, the photon sector) by a $CPT$-even $k_F$-term. An effective photonic action is discussed that originates from the supersymmetric background fermion condensates. Also, the photino mass emerges in terms of a particular condensate contrary to what happens in the $k_{AF}$-violation. Finally, the interparticle potential induced by the effective photonic action is investigated and a confining profile is identified.Comment: 14 pages. arXiv admin note: text overlap with arXiv:1102.3777 by other author

Desorption Dynamics of Heavy Alkali Metal Atoms (Rb, Cs) off the Surface of Helium Nanodroplets

We present a combined ion imaging and density functional theory study of the dynamics of the desorption process of rubidium and cesium atoms off the surface of helium nanodroplets upon excitation of the perturbed $6s$ and $7s$ states, respectively. Both experimental and theoretical results are well represented by the pseudodiatomic model for effective masses of the helium droplet in the desorption reaction of m_eff/m_He~10 (Rb) and 13 (Cs). Deviations from this model are found for Rb excited to the 6p state. Photoelectron spectra indicate that the dopant-droplet interaction induces relaxation into low-lying electronic states of the desorbed atoms in the course of the ejection process.Comment: in press, J. Phys. Chem. A (2014

Repercussão das Colheitas de Sangue sobre os Valores de Hemoglobina em Recém-Nascidos de Muito Baixo Peso (RNMBP) Submetidos a Terapia Intensiva

A perda iatrogénica de sangue constitui um problema comum nas unidades de cuidados intensivos neonatais. O objectivo deste trabalho foi quantificaras espoliações de sangue para estudos analíticos em 22 RNMBP durante as primeiras três semanas de hospitalização. O número médio de colheitas por criança e por dia foi IA e o número médio de colheitas por criança no período estudado foi 29.7. O valor cumulativo médio de sangue espoliado pelo 21." dia foi 18,7 ml/kg. Os valores médios de hemoglobina nas primeiras 12 horas de tida e no 21." dia foram respectivamente 16.4 e 12.9 gr/d1. Verificou-se uma relação estreita entre o volume de sangue extraído e o volume de sangue transfundido. sugerindo este facto que. em geral. as transfusões são efectuadas por necessidade de compensar as perdas sanguíneas relacionadas com as colheitas de sangue. Conclui-se que as espoliações repetidas de sangue para análises laboratoriais se repercutem significativamente nos valores de hemoglobina dos recém-nascidos pretermo e de MBP sendo portanto desejável que tais espoliações sejam rigorosamente quantificadas e reduzidas ao mínimo tendo em conta os riscos das transfusões de sangue

Efeito da matéria orgânica (liter e séston) na metanogênese de um lago amazônico impactado por efluentes da lavagem da bauxita.

Este estudo investigou, em laboratório, o efeito da adição de matéria orgânica (litter e séston) na atividade metanogênica de amostras de sedimento do lago Batata (Oriximiná, PA; 1° 30? S e 56° 20? W). Durante 11 anos, cerca de 25.000 m3 de efluentes da lavagem de bauxita foram lançados, diariamente, assoreando 30% da área total do lago. Este efluente formou uma camada superior a 10 cm sob a superfície do sedimento natural. Para a realização dos experimentos, foram coletados 18 perfis (10 cm de água do lago + 10 cm de sedimento) na área impactada e não impactada do lago. As amostras foram separadas em 3 grupos: controle (sem adição de suplemento de carbono), grupo 1 (adição de 50 mg de séston) e grupo 2 (adição de 270 mg de litter). A concentração de metano na área natural foi signifi cativamente (Kruskall-Wallis; p < 0,05) maior que àquela mensurada na área impactada. Por sua vez, a adição de carbono causou um aumento significativo (Kruskall-Wallis; p < 0,05) na atividade metanogênica, o que resultou em elevadas concentrações de metano nas amostras dos grupos 1 e 2.Paine

Interacting Particles and Strings in Path and Surface Representations

Non-relativistic charged particles and strings coupled with abelian gauge fields are quantized in a geometric representation that generalizes the Loop Representation. We consider three models: the string in self-interaction through a Kalb-Ramond field in four dimensions, the topological interaction of two particles due to a BF term in 2+1 dimensions, and the string-particle interaction mediated by a BF term in 3+1 dimensions. In the first case one finds that a consistent "surface-representation" can be built provided that the coupling constant is quantized. The geometrical setting that arises corresponds to a generalized version of the Faraday's lines picture: quantum states are labeled by the shape of the string, from which emanate "Faraday`s surfaces". In the other models, the topological interaction can also be described by geometrical means. It is shown that the open-path (or open-surface) dependence carried by the wave functional in these models can be eliminated through an unitary transformation, except by a remaining dependence on the boundary of the path (or surface). These feature is closely related to the presence of anomalous statistics in the 2+1 model, and to a generalized "anyonic behavior" of the string in the other case.Comment: RevTeX 4, 28 page

Maxwell Chern Simons Theory in a Geometric Representation

We quantize the Maxwell Chern Simons theory in a geometric representation that generalizes the Abelian Loop Representation of Maxwell theory. We find that in the physical sector, the model can be seen as the theory of a massles scalar field with a topological interaction that enforces the wave functional to be multivalued. This feature allows to relate the Maxwell Chern Simons theory with the quantum mechanics of particles interacting through a Chern Simons fieldComment: 12 pages, LaTe

Use of granulocyte growth factors: recommendations of the Portuguese Society of Hematology

The administration of cytotoxic chemotherapy may be complicated by the emergence of neutropenia and febrile neutropenia, frequently determining hospital admission and intravenous treatment with broad spectrum antibiotics. Frequently, it is necessary to reduce the dose or to delay the administration of the cytotoxic drugs reducing the relative dose intensity of the chemotherapy regimen. Granulocyte growth factors stimulate the proliferation and differentiation of neutrophils and reduce the number of days of severe neutropenia and febrile neutropenia associated with cytotoxic chemotherapy. They are also indicated for the collection of hematopoietic progenitors for autologous and allogeneic transplantation, as well as in non malignant diseases associated with chronic neutropenia. This article reviews the evidence supporting the use of granulocyte growth factors in Hematology

Application of the penalty coupling method for the analysis of blood vessels

Due to the significant health and economic impact of blood vessel diseases on modern society, its analysis is becoming of increasing importance for the medical sciences. The complexity of the vascular system, its dynamics and material characteristics all make it an ideal candidate for analysis through fluid structure interaction (FSI) simulations. FSI is a relatively new approach in numerical analysis and enables the multi-physical analysis of problems, yielding a higher accuracy of results than could be possible when using a single physics code to analyse the same category of problems. This paper introduces the concepts behind the Arbitrary Lagrangian Eulerian (ALE) formulation using the penalty coupling method. It moves on to present a validation case and compares it to available simulation results from the literature using a different FSI method. Results were found to correspond well to the comparison case as well as basic theory

Invariants from classical field theory

We introduce a method that generates invariant functions from perturbative classical field theories depending on external parameters. Applying our methods to several field theories such as abelian BF, Chern-Simons and 2-dimensional Yang-Mills theory, we obtain, respectively, the linking number for embedded submanifolds in compact varieties, the Gauss' and the second Milnor's invariant for links in S^3, and invariants under area-preserving diffeomorphisms for configurations of immersed planar curves.Comment: 20 pages, 1 figure, to appear in J. Math. Phy