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Start Over Coverage 289-291

2. Photosynthesis, transpiration, and water use efficiency of Leymus dasystachys on the Hunshandake desert

Creator:
Wang, R. Z., Liu, X. Q., Xing, Q., and Bai, Y.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
dry and rainy seasons, leaf age and insertion, and stomatal conductance
Language:
Multiple languages
Description:
Net photosynthetic rate (PN), transpiration rate (E), and stomatal conductance (gs) declined from upper leaves to the lower ones during dry and rainy seasons, indicating that long-term carbon budget should take into account PN variations for different leaf types. Relatively greater PN in the dry season suggested that this species is more able to maintain higher PN under drought, but the relatively higher E in the dry season might reduce water use efficiency (PN/E) for the species. Significant correlations between PN and gs indicated that gs may be the critical factor for PN variability in the desert region. and R. Z. Wang ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. The role of angular mementum transfer to determine the mass ratio of binaries

Creator:
Paolicchi, P., Bellesi, M., Ferrini, F., and Bossi, M.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
stellar astrophysics, thermodynamics, and mass ratio of binaries
Language:
Czech
Description:
A thermodynamical approach to the problem of star formation, presented in a previous paper, shows how, at least when the last stages of collapse are assumed as adiabatic, the characteristics of the outcomes depend on the initial conditions (thermal and rotational energies) and on the distribution of the angular momentum among the various parts of the system. In the case of a binary outcome, the distiribution can be profitably expressed in terms of two parameters, roughly corresponding to a) the spin ratio as function of the mass ratio and b) the fraction of a.m. involved in the orbital motion. A systematic exploration of these parameters allows us to analyze the different kinds of results. In this paper we present some preliminary results, assuming that both single and binary outcomes have an equilibrium Mc Laurin ellipsoidal shape, but not taking into account the possible formation of a system star+protoplanetary disc.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public