524 research outputs found
Treaty of Amity, Commerce, and Navigation Between Brazil and the U.S.
This Article deals with the analytical history of the Treaty of Amity, Commerce and Navigation between the U.S. and Brazil. In the first part of the Article, the author analyzed all the provisions of the Treaty entered into between the two countries on December 12, 1828. The second part examined the historical causes for the early termination of the Treaty, 13 years after its execution. It suggests and evidences that the historical cause lies in a political factor, that is, the conflicts between a Republican form of government and the Brazilian Imperial political system. The third and final part of the Article deals with the economic history of investments and business between the two countries. It finalizes to suggest the economic losses to both countries in the absence of a new Treaty in force. It also makes an exhortation to both countries to enter into a new Treaty of Amity, Commerce and Navigatio
Treaty of Amity, Commerce, and Navigation Between Brazil and the U.S.
This Article deals with the analytical history of the Treaty of Amity, Commerce and Navigation between the U.S. and Brazil. In the first part of the Article, the author analyzed all the provisions of the Treaty entered into between the two countries on December 12, 1828. The second part examined the historical causes for the early termination of the Treaty, 13 years after its execution. It suggests and evidences that the historical cause lies in a political factor, that is, the conflicts between a Republican form of government and the Brazilian Imperial political system. The third and final part of the Article deals with the economic history of investments and business between the two countries. It finalizes to suggest the economic losses to both countries in the absence of a new Treaty in force. It also makes an exhortation to both countries to enter into a new Treaty of Amity, Commerce and Navigatio
Excitation of the odd-parity quasi-normal modes of compact objects
The gravitational radiation generated by a particle in a close unbounded
orbit around a neutron star is computed as a means to study the importance of
the modes of the neutron star. For simplicity, attention is restricted to
odd parity (``axial'') modes which do not couple to the neutron star's fluid
modes. We find that for realistic neutron star models, particles in unbounded
orbits only weakly excite the modes; we conjecture that this is also the
case for astrophysically interesting sources of neutron star perturbations. We
also find that for cases in which there is significant excitation of quadrupole
modes, there is comparable excitation of higher multipole modes.Comment: 18 pages, 21 figures, submitted to Phys. Rev.
A new measure of health motivation influencing food choices and its association with food intakes and nutritional biomarkers in European adolescents
Objective:To develop a scale to assess health motivation influencing food choices and to explore its performance in the associations with food intakes and nutritional biomarkers.
Design:Psychometric study using cross-sectional self-report questionnaires and nutritional biomarkers.
Setting:Multi-centre investigation conducted in ten European cities.
Participants:2954 adolescents who were included in the HELENA study and completed the Food Choices and Preferences (FCP) questionnaire.
Results:Nineteen out of 124 items of the FCP questionnaire were in the same dimension. Sixteen presented adequate parameters for the Scale of evaluatiOn of Food choIcEs (SOFIE). The scores were positively associated with the intakes of cereals, dairy products, meats and eggs, and fish, as well as with blood concentrations of vitamin C, ß-carotene, n-3 fatty acids, cobalamin, holo-transcobalamin and folate; scores were negatively associated with the intake of alcohol.
Conclusions:SOFIE can improve the assessment of motivation influencing food choices based on items with the best performance and is proposed as a new measure to health-related studies
On the critical behavior of disordered quantum magnets: The relevance of rare regions
The effects of quenched disorder on the critical properties of itinerant
quantum antiferromagnets and ferromagnets are considered. Particular attention
is paid to locally ordered spatial regions that are formed in the presence of
quenched disorder even when the bulk system is still in the paramagnetic phase.
These rare regions or local moments are reflected in the existence of spatially
inhomogeneous saddle points of the Landau-Ginzburg-Wilson functional. We derive
an effective theory that takes into account small fluctuations around all of
these saddle points. The resulting free energy functional contains a new term
in addition to those obtained within the conventional perturbative approach,
and it comprises what would be considered non-perturbative effects within the
latter. A renormalization group analysis shows that in the case of
antiferromagnets, the previously found critical fixed point is unstable with
respect to this new term, and that no stable critical fixed point exists at
one-loop order. This is contrasted with the case of itinerant ferromagnets,
where we find that the previously found critical behavior is unaffected by the
rare regions due to an effective long-ranged interaction between the order
parameter fluctuations.Comment: 16 pp., REVTeX, epsf, 2 figs, final version as publishe
Quantum Griffiths effects and smeared phase transitions in metals: theory and experiment
In this paper, we review theoretical and experimental research on rare region
effects at quantum phase transitions in disordered itinerant electron systems.
After summarizing a few basic concepts about phase transitions in the presence
of quenched randomness, we introduce the idea of rare regions and discuss their
importance. We then analyze in detail the different phenomena that can arise at
magnetic quantum phase transitions in disordered metals, including quantum
Griffiths singularities, smeared phase transitions, and cluster-glass
formation. For each scenario, we discuss the resulting phase diagram and
summarize the behavior of various observables. We then review several recent
experiments that provide examples of these rare region phenomena. We conclude
by discussing limitations of current approaches and open questions.Comment: 31 pages, 7 eps figures included, v2: discussion of the dissipative
Ising chain fixed, references added, v3: final version as publishe
Electron Dynamics in NdCeCuO: Evidence for the Pseudogap State and Unconventional c-axis Response
Infrared reflectance measurements were made with light polarized along the a-
and c-axis of both superconducting and antiferromagnetic phases of electron
doped NdCeCuO. The results are compared to
characteristic features of the electromagnetic response in hole doped cuprates.
Within the CuO planes the frequency dependent scattering rate,
1/, is depressed below 650 cm; this behavior is a
hallmark of the pseudogap state. While in several hole doped compounds the
energy scales associated with the pseudogap and superconducting states are
quite close, we are able to show that in NdCeCuO
the two scales differ by more than one order of magnitude. Another feature of
the in-plane charge response is a peak in the real part of the conductivity,
, at 50-110 cm which is in sharp contrast with the
Drude-like response where is centered at . This
latter effect is similar to what is found in disordered hole doped cuprates and
is discussed in the context of carrier localization. Examination of the c-axis
conductivity gives evidence for an anomalously broad frequency range from which
the interlayer superfluid is accumulated. Compelling evidence for the pseudogap
state as well as other characteristics of the charge dynamics in
NdCeCuO signal global similarities of the cuprate
phase diagram with respect to electron and hole doping.Comment: Submitted to PR
Impedance spectroscopy measurements to study physio-chemical processes in lime-based composites
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