2,765 research outputs found
The Charter of Nice in the law in action: an investigation into the judges’ statement of reasons (2000-2008). WP C.S.D.L.E. "Massimo D'Antona" .INT - 74/2009
The first part of this work is dedicated to European Courts decisions and to the Advocate General’s Conclusions; the second part is dedicated to domestic judges' decisions. The abovementioned division of the work aims to highlight if and to what extent the attitude demonstrated in comparisons of the same "phenomenon" by supranational judiciary and national judiciary – who are considered EU judges of the first level – is different, and to identify the various consequences that it determines
The Role of Temperature in the occurrence of some Zeno Phenomena
Temperature can be responsible for strengthening effective couplings between
quantum states, determining a hierarchy of interactions, and making it possible
to establish such dynamical regimes known as Zeno dynamics, wherein a strong
coupling can hinder the effects of a weak one. The relevant physical mechanisms
which connect the structure of a thermal state with the appearance of special
dynamical regimes are analyzed in depth
Genuine Tripartite Entanglement in a Spin-Star Network at Thermal Equilibrium
In a recent paper [M. Huber {\it et al}, Phys. Rev. Lett. {\bf 104}, 210501
(2010)] new criteria to find out the presence of multipartite entanglement have
been given. We exploit these tools in order to study thermal entanglement in a
spin-star network made of three peripheral spins interacting with a central
one. Genuine tripartite entanglement is found in a wide range of the relevant
parameters. A comparison between predictions based on the new criteria and on
the tripartite negativity is also given.Comment: 8 pages, 13 figure
Sensitivity of Measurement-Based Purification Processes to Inner Interactions
The sensitivity of a repeated measurement-based purification scheme to
additional undesired couplings is analyzed, focusing on the very simple and
archetypical system consisting of two two-level systems interacting with a
repeatedly measured one. Several regimes are considered and in the strong
coupling (i.e., when the coupling constant of the undesired interaction is very
large) the occurrence of a quantum Zeno effect is proven to dramatically
jeopardize the efficiency of the purification process.Comment: 12 pages, 6 figure
Oscillations of the purity in the repeated-measurement-based generation of quantum states
Repeated observations of a quantum system interacting with another one can
drive the latter toward a particular quantum state, irrespectively of its
initial condition, because of an {\em effective non-unitary evolution}. If the
target state is a pure one, the degree of purity of the system approaches
unity, even when the initial condition of the system is a mixed state. In this
paper we study the behavior of the purity from the initial value to the final
one, that is unity. Depending on the parameters, after a finite number of
measurements, the purity exhibits oscillations, that brings about a lower
purity than that of the initial state, which is a point to be taken care of in
concrete applications.Comment: 5 pages, 3 figure
Geometric phase accumulation-based effects in the quantum dynamics of an anisotropically trapped ion
New physical effects in the dynamics of an ion confined in an anisotropic
two-dimensional Paul trap are reported. The link between the occurrence of such
manifestations and the accumulation of geometric phase stemming from the
intrinsic or controlled lack of symmetry in the trap is brought to light. The
possibility of observing in laboratory these anisotropy-based phenomena is
briefly discussed.Comment: 10 pages. Acta Physica Hungarica B 200
N USE AND PARTITIONING IN CORIANDER (CORIANDRUM SATIVUM L.) AFTER ORGANIC AND CONVENTIONAL N FERTILIZATION
In coriander, a well known spice herb, many studies concerning the effect of N fertilization have been conducted in special areas where the cultivation of such plant has a major importance, such as India. Limited information is available as concerns the response of coriander to N fertilization under Mediterranean climatic conditions, above all when organic N fertilizers (mandatory when organic cropping management is chosen) are used. This work refers about some observations realised from 2004 to 2006 by an experiment on organic and mineral N fertilization techniques in coriander, carried on in the experimental farm “Sparacia”
(Cammarata, AG, Sicily). Similarly to what suggested for other species, each year at harvest time, for each fertilizer treatment, seeds yield and plant biomass were weighed and the respective N content was determined in order to compare N plant uptake with total and mineral N measured in the soil before and after cropping cycle. From such data a few indices were calculated in order to get information about the efficiency of use by plants of the tested N forms. Some differences in N partitioning and use efficiency according to treatment were noticed, suggesting an overall higher efficiency of N chemical fertilizers
Revealing non-classical behaviours in the oscillatory motion of a trapped ion
The possibility of revealing non-classical behaviours in the dynamics of a
trapped ion via measurements of the mean value of suitable operators is
reported. In particular we focus on the manifestation known as `` Parity
Effect\rq\rq which may be observed \emph{directly measuring} the expectation
value of an appropriate correlation operator. The experimental feasibility of
our proposal is discussed.Comment: 5 pages, 2 figure
Dynamics of a two-state system through a real level crossing
The dynamics of a two-state system whose energies undergo a real crossing at
some instant of time is studied. At this instant, both the coupling and the
detuning vanish simultaneously, which leads to an exact degeneracy of the
eigenenergies of the system. It is found that the dynamics of the system is
primarily determined by the manner in which the degeneracy occurs. This
interesting behavior is reminiscent of a symmetry breaking process, since the
totally symmetric situation occurring at the crossing is significantly altered
by infinitesimal quantities, which remove the degeneracy, with very important
dynamical implications from there on. A very simple analytical formula is
derived, which is found to describe the population changes very accurately
EFFECTS OF ORGANIC AND CONVENTIONAL N-FERTILIZATION ON QUALITY TRAITS IN CORIANDER (CORIANDRUM SATIVUM L.)
In organic cropping management of Medicinal and Aromatic Plants, the best quality expression is crucial to gain satisfactory incomes. Coriander (Coriandrum sativum L.) is an annual herbaceous plant with a commercial value due to the typical scent of its fruits (commonly termed “seeds”), rich in a pale yellow oil (1-2% in small-sized types, 0.2-0.5% in large-sized ones). Several studies have been done for determining the composition of volatile fraction of Coriander, which was found to vary also as a consequence of cropping techniques, including nitrogen fertilization. In order to gain useful information about the effects, if present at all, of organic N fertilization on Coriander quality in terms of volatiles composition pattern, a three-year trial (2004-2006) was carried out using different types and rates of organic and conventional N fertilizers. Volatile composition of fruits was obtained by means of GC-MS and data were evaluated by multivariate statistical analysis. The most representative compound are linalool, followed by camphor, geranyl acetate and geraniol. The group partition was mainly due to different quantitative ratio of compounds; the differences in volatile composition, however, followed a scheme more resembling the cropping year than the fertilization management
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