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Showing papers by "University of Barcelona published in 1971"


Journal ArticleDOI
TL;DR: In this article, the complete sets of restrictions among structure functions which stem from the semi-positive definiteness of the electromagnetic and weak hadronic tensors are derived, and applications are made to inelastic scattering of electrons or muons from polarized nucleons.
Abstract: The complete sets of restrictions among structure functions which stem from the semi-positive definiteness of the electromagnetic and weak hadronic tensors are derived. Applications are made to inelastic scattering of electrons or muons from polarized nucleons, inelastic scattering of polarized electrons or muons from polarized nucleons and inelastic scattering of neutrinos from nucleons with subsequent analysis of the polarization of the outgoing muon.

48 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that the set D of vector fields on the configuration space B of a field whose 1-parameter groups locally associated are groups of fibre-preserving transformations of B that leave invariant that field in the sense of variational theory, is a Lie algebra with respect to ordinary addition, multiplication by real numbers and Lie brackets.
Abstract: We prove that the set D of vector fields on the configuration space B of a field whose 1-parameter groups locally associated are groups of fibre-preserving transformations of B that leave invariant that field in the sense of variational theory, is a Lie algebra with respect to ordinary addition, multiplication by real numbers and Lie brackets. We see that this Lie algebra structure can be carried over to the corresponding set ℐ of Noether invariants, which then becomes a Lie algebra in a natural way.

43 citations


Journal ArticleDOI
TL;DR: The relationship between mating speed and wing length is studied as part of a wider analysis of the correlations between wing length and the main components of fitness, aiming to get information about the selection mechanisms controlling size.
Abstract: Mating speed is an important component of fitness as shown by Prakash (1967) who found a positive correlation between fast mating, repeat mating, and fertility in Drosophila robusta. Maynard Smith (1956) has shown that the Drosophila subobscura female performs only one effective mating during its life, so mating speed in this species should be of special significance in the males. In this paper the relationship between mating speed and wing length is studied. This study is part of a wider analysis of the correlations between wing length and the main components of fitness, aiming to get information about the selection mechanisms controlling size. Preliminary results of these experiments have been published elsewhereby Monclus and Prevosti (1967).

30 citations



Journal ArticleDOI

7 citations




Journal ArticleDOI
TL;DR: In this paper, the extract of Thymus caespitititius, which did not distill off with water, has been fractioned into neutral and acidic fractions, and Saturated n -alkanes (19 from C 14 to C 36 ) were identified by mass spectrometer and gas chromatography in the neutral fraction.

3 citations


Journal ArticleDOI
TL;DR: In this article, the thermal behavior of [CoCO3(NH3)4]2SO4 · 3H2O was studied using X-ray diffraction diagrams, DTA, TG and heating at constant temperatures for different periods of time.
Abstract: The thermal behaviour of [CoCO3(NH3)4]2SO4 · 3H2O was studied using X-ray diffraction diagrams, DTA, TG and heating at constant temperatures for different periods of time. The X-ray study was made in order to characterize with the powder diagrams the phases obtained and to follow the reactions of the complex when heated in air up to 800‡. A parallel infrared spectral study was also made. The results obtained by the various experimental methods were compared with the theoretical weight losses.

2 citations


Journal ArticleDOI

2 citations