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In the literature, frost hardiness (FH) studies in trees have often been restricted to one organ (buds, leaves, needles or twigs). To extend our knowledge and gain a unified view, FH differences between organs and tissues or throughout the life of the tree have to be characterized in relation to physiological changes. In this study, different organs and(More)
It has been hypothesized that the increase in temperature in this century could lead to an increase in frost damage to plant tissues. Several models have been proposed to describe the development of cold hardiness, but never taking into account extreme climatic and/or physiological events. Our results on walnut tree (Juglans regia L.) show that cold(More)
The objective of this study was to investigate the effects of future warming and drought on (1) the biochemical composition of above-ground biomass of forage plants (Festuca arundinacea and Dactylis glomerata), (2) the potential mineralization of this material in soil, and (3) its priming effect on native soil organic matter. We sampled above-ground plant(More)
High-resolution ultrasonic velocity measurements have been used to determine the temperature-magnetic-field phase diagram of the monoclinic multiferroic CuO. A new transition at T(N3)=230 K, corresponding to an intermediate state between the antiferromagnetic noncollinear spiral phase observed below T(N2)=229.3 K and the paramagnetic phase, is revealed.(More)
We report a microwave study of the longitudinal and transverse transport properties of the quasi-one-dimensional organic conductor (TMTSF)2PF6 in its normal phase. The contactless technique have provided a direct measurement of the temperature profile of the resistivity along the b’ direction and in magnetic fields up to 14 T. A characteristic energy scale(More)
2014 In this paper we predict new possible M1 E1 Stark interference effects which should appear in nS n’ S M1 forbidden transitions when a static magnetic field crossed with the static electric field is applied. In particular it becomes possible to measure the ratio M1/E1 Stark directly on the fluorescence intensity. These effects are also of importance for(More)
The behaviour of doubly excited circular atoms in weak parallel electric and magnetic fields has been studied. The Hamiltonian, including the e-e interaction between the two excited electrons, Stark and Zeeman effects, is diagonalized in a truncated basis. The Rydberg electron, initially in a circular state, experiences a mixing of its orbital and magnetic
Microwave absorption at 16.8 GHz has been measured on an epoxy sample containing 15 % in volume of superconducting single crystals YBa2Cu307 aligned in a magnetic field during resin solidification. The absorption data are found anisotropic and they have been studied as a function of the magnetic field up to 8.5 Teslas. They are discussed in relation to(More)
We present a Landau model that accounts for the unusual elastic properties of the quasi-one-dimensional antiferromagnetic compound CsNiCl3. The model’s predictions are tested using published strain measurements and recent high resolution sound velocity measurements realized as a function of temperature and pressure. In particular, we derive an analytical(More)