Browsing Articles  Science and Technology by Issue Date
Now showing items 120 of 780

Bifurcation and total stability
(C E D A M, 1984) 
Multiplicity of subharmonic solutions of forced Hamiltonian systems near an equilibrium
(Springer Verlag (Germany), 1989)We prove existence and multiplicity of long time periodic solutions for a class of nonlinear nonautonomous Hamiltonian systems locally near an equilibrium solution. The result relies on a variational principle and on the ... 
Multiplicity of kTperiodic solutions near a given Tperiodic solution for nonlinear Hamiltonian systems
(Khayyam Publishing, 1989) 
Forced oscillations for singular dynamical systems with an application to the restricted three body problem
(Elsevier, 1991)We consider forced dynamical systems with two degrees of freedom having singular potentials and we prove existence of infinitely many classical (noncollision) periodic solutions. These solutions have a prescribed rotation ... 
Homoclinics for Lagrangian systems on Riemannian manifolds
(Dynamic Publishers Atlanta, 1992) 
Homoclinic solutions of quasiperiodic Lagrangian systems
(Khayyam Publishing, 1995)We consider quasiperiodic positive definite Lagrangian systems and establish the existence of one or more solutions homoclinic (namely asymptotic as $t o \pm \infty$) to a quasiperiodic solution. These results are obtained ... 
Effect of soil humic substances on surface redox activity of oat roots
(1995)The effect of a low molecular weight (<5kDa, LMW) and a high molecular weight (>5kDa, HMW) humic fractions on surface redox activities of oat roots was studied. Oxidation of the electron donor NADH and reduction of the ... 
Plasma Membrane H+ATPase in Maize Roots Induced for NO3 Uptake
(1995)Plasma membrane H+ATPase was studied in maize (Zea mays L.) roots induced for NO3 uptake. Membrane vesicles were isolated by means of Suc density gradient from roots exposed for 24 h either to 1.5 mM NO3 or 1.5 mM SO4. ... 
Plasma Membrane H+ATPase in Maize Roots Induced for NO3 Uptake
(1995)Plasma membrane H+ATPase was studied in maize (Zea mays L.) roots induced for NO3 uptake. Membrane vesicles were isolated by means of Suc density gradient from roots exposed for 24 h either to 1.5 mM NO3 or 1.5 mM SO4. ... 
Pedogenic evolution and 137Cs contents in soils of the Eastern Alps (FriuliVenezia Giulia, Italy)
(1995)Two lithosequences were examined, starting from siliceous and calcareous parent material, respectively. The morphological and chemical soil properties allowed to evidentiate different evolutionary trends. Radioactivity ... 
Castration technique for Llamas
(SCHLUTERSCHE VERLAG DRUCKEREI, 1995)Llamas and alpakas have gained and maintained popularity in the United States and Europe. Castration is the most common surgical procedure performed on llamas. It decreases the number of undesirable genetic characteristics, ... 
Multiplicity of homoclinic solutions for singular second order conservative systems
(Cambridge University Press (CUP), 1996)We consider a class of secondorder systems , with q(t) ∊ℝn, for which the potential energy V: ℝn\S→ℝ admits a (possibly unbounded) singular set S ⊂ℝn and has a unique absolute maximum at 0 ∈ℝn. Under some conditions on S ... 
Marktorientiertes Produkt und Kostenmanagement: Target Costing – ein Hilfsmittel?
(1996)Die verschärften Wettbewerbsbedingungen durch den wachsenden Anteil an Billiganbietern aus Fernost sowie die Globalisierung der Märkte zwingen insbesondere mittelständische Unternehmen, schnell und kostengünstig am Markt ... 
Changes in plasma membrane H+ATPase activity during aeration of maize roots
(1996)Plasma membraneenriched vesicles were isolated by density gradient centrifugation from maize roots previously submersed for 2 h with or without aeration in a 1 mmol/L CaSO4 solution, a condition which can modify the rate ...