dispersive liquid-liquid microextraction technique based on solidification of a floating organic drop (dllme-sfo) combined with flame atomic absorption spectrometry was developed for determination of thallium in water sample. an appropriate mixture of acetone and 1-undecanol was rapidly injected into an aqueous sample containing tlcl4- which forms an ion pair with brilliant green reagent and as...

This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract Idealized large-eddy simulations were performed to investigate the impact of different mountain geometries on daytime pollution transport by thermally driven winds. The main objective was to determine interactions bet...

The research reported in this chapter takes part of the results of the project Cultura, Matemática e Cognição — Pensar a Aprendizagem em Portugal e Cabo Verde, especially in what concerns understanding the idea of “learning as an integral part of generative social practice in the lived-in world” (Lave & Wenger, 1991, p.35) together with the perspective that addresses “learning as increasing par...

We consider the Green functions G for second-order coercive differential operators on homogeneous manifolds of negative curvature, being a semi-direct product of a nilpotent Lie group N and A = R+. Estimates for derivatives of the Green functions G with respect to the N and A-variables are obtained. This paper completes a previous work of the author (see [12, 13]) where estimates for derivative...

The early detection and identification of plant borne pathogens is an integral part of successful disease management and this is especially important in relation to the importation of foreign plant material. The rapid identification of a plant pathogen, allows for the appropriate control measures to be applied prior to the further spread of the disease or its introduction. Since most plant-base...

Various Green functions of the Dirac equation with a magnetic-solenoid field (the superposition of the Aharonov-Bohm field and a collinear uniform magnetic field) are constructed and studied. The problem is considered in 2 + 1 and 3 + 1 dimensions for the natural extension of the Dirac operator (the extension obtained from the solenoid regularization). Representations of the Green functions as ...

The thermal Euclidean Green functions for Photons propagating in the Rindler wedge are computed employing an Euclidean approach within any covariant Feynman-like gauge. This is done by generalizing a formula which holds in the Minkowskian case. The coincidence of the found (β = 2π)-Green functions and the corresponding Minkowskian vacuum Green functions is discussed in relation to the remaining...

Guided by the large-N C limit of QCD, we construct the most general chiral resonance Lagrangian that can generate chiral low-energy constants up to O(p 6). By integrating out the resonance fields, the low-energy constants are parametrized in terms of resonance masses and couplings. Information on those couplings and on the low-energy constants can be extracted by analysing QCD Green functions o...