Wasserzusatz

Ohne Zusammenfassung     

First glances at the transversity parton distribution through dihadron fragmentation functions

We present first observations of the transversity parton distribution based on an analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets. The extraction of transversity relies on the knowledge of dihadron fragmentation functions, which we take from electron-positron annihilation measurements. This is the first attempt to determine the transversity distribution in the framework of collinear factorization.     

Non-perturbative momentum dependence of the coupling constant and hadronic models

Models of hadron structure are associated with a hadronic scale which allows by perturbative evolution to calculate observables in the deep inelastic region. The resolution of Dyson-Schwinger equations leads to the freezing of the QCD running coupling (effective charge) in the infrared, which is best understood as a dynamical generation of a gluon mass function, giving rise to a momentum dependence which is free from infrared divergences. We use this new development to understand why perturbative treatments are working reasonably well despite the smallness of the hadronic scale.     

CONTRIBUTION A L'ÉTUDE DU RÔLE DE LA LUMIÈRE DANS LA SEXUALISATION DU GAMÉTOPHYTE DE MARCHANTIA POLYMORPHA L.

Abstract— Gemmae of Marchantia polymorpha L. were grown in artificial light (16 hr, 4000 lx), aseptic conditions, at the Phytotron of Liège. It was shown that:
(1) Two distinct phases are obvious in growth and development of the gemmae:
(a) A juvenile phase with a minimum length of 15 days in any kind of light quality, on a mineral nutrient medium.
(b) An inductive phase , during which the inception of primordia occurs in incandescent light.
(2) When 1% sucrose is added to the mineral nutrient medium, the length of the juvenile phase is reduced to 5 days; however, sucrose has no action when it is provided in the dark.
It is assumed that the inductive incandescent light may promote a high energy reaction which is required for sexual induction.     

Vibration-rotation bands of isotopic carbon disulfide at 4.6 μm

The 10⁰1-00⁰0 bands of ¹²C³⁴S₂ and ¹³C³⁴S₂ have been measured with a resolution of 0.03 cm^?1. The following “hot” bands associated with this transition were also measured and analyzed: 11¹1-01¹0, 20⁰1–10⁰0 for both isotopic forms. For ¹²C³⁴S₂, the Δ-Δ transition 12²1–02²0 has also been observed. In addition, the 10⁰1-00⁰0 bands of the isotopic species ¹²C³²S³⁴S and ¹²C³³S³⁴S were measured.     

The ν3 band of 16O12C34S and 16O13C34S

The ν₃ fundamental of OCS has been measured with a resolution of about 0.03 cm^?1 for the isotopic species ¹⁶O¹²C³⁴S and ¹⁶O¹³C³⁴S. The associated transition 01¹1-01¹0 has also been measured. The transition 10⁰1-00⁰0 is also reported for the ¹⁶O¹²C³⁴S species.     

High resolution infrared spectra of carbon disulfide: 13CS2

By using a “dual-grille” spectrometer, twelve transitions of ¹³CS₂ have been observed between 1400 and 3000 cm^?1. The position of eleven vibration levels have been fixed accurately. The molecular constants of ¹³CS₂ determined by vibrational and vibrorotational analysis are in good agreement with the constants issued from the ¹²CS₂ analysis.     

C2H3D—Some important features of the valence region: Interpretation of the Fermi doublet ν1 and ν2 + ν12; rotational and centrifugal distorsion parameters for the ν5, ν2 + ν3 and ν9 levels

The infrared absorption spectra of C₂H₃D is recorded between 3270 and 2830 cm^?1 with a resolution better than 0.030 cm^?1. Five absorption bands are observed and a number of local perturbations interpreted. Recent results concern the ν₁ and ν₂ + ν₁₂ Fermi doublet, the ν₅ which is badly overlapped by the ν₉ band, and the ν₂ + ν₃ weaker band. From the present work and the previously published ground-state parameters it is now possible to draw a precise picture of all this region and to determine the magnitude of some k_ijk and ζ_ij^α constants.