1,721,131 research outputs found
Le dromadaire dans l'Ancien Orient.
No full textEpstein H. Le dromadaire dans l'Ancien Orient.. In: Revue d'histoire des sciences et de leurs applications, tome 7, n°3, 1954. pp. 247-268
Loops in de Sitter space
Full text linkWe discuss general one and two-loops banana diagrams with arbitrary masses on the de Sitter spacetime by using direct methods of dS quantum field theory in the dimensional regularization approach. In the one-loop case we also compute the effective potential for an O(N) model in d = 4 dimension as an explicit function of the cosmological constant Λ, both exactly and perturbatively up to order Λ. For the two-loop case we show that the calculation is made easy thanks to a remarkable Källén-Lehmann formula that has been in the literature for a while. We discuss the divergent cases at d = 3 using a contiguity formula for generalized hypergeometric functions and we extract the dominant term at d = 4 proving a general formula to deal with a divergent hypergeometric series
Analyticity properties and thermal effects for general quantum field theory on de Sitter space-time
No full textLoops in anti de Sitter space
Full text linkWe discuss general one and two-loop banana diagrams and one-loop diagrams with external lines with arbitrary masses on the anti de Sitter spacetime by using methods of AdS quantum field theory in the dimensional regularization approach. The banana diagrams explicitly computed in this paper are indeed the necessary ingredients for the evaluation of the two-loop effective potential of the Standard Model and can be used to extend the flat space results in presence of a negative cosmological constant. In the one-loop case we also compute the effective potential for an O(N) model in d = 4 dimension as an explicit function of the cosmological constant Λ, both exactly and perturbatively up to order Λ. In the two-loop case we show the explicit calculation is possible thanks to a remarkable discrete Källén-Lehmann formula which we found and proved sometimes ago and whose domain of applicability we extend in the present paper
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Epstein, H. — Domestic Animals of China. — Farnham Royal, Commonwealth Agricultural Bureaux, 1969
No full textBourlière François. Epstein, H. — Domestic Animals of China. — Farnham Royal, Commonwealth Agricultural Bureaux, 1969. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 23, n°3, 1969. p. 364
Epstein, H. — Domestic Animals of Nepal. New York & London, Holmes and Meier. Publishers, 1977
No full textBourlière François. Epstein, H. — Domestic Animals of Nepal. New York & London, Holmes and Meier. Publishers, 1977. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 31, n°4, 1977. p. 673
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