10,614,242 research outputs found
Transport of a quantum degenerate heteronuclear Bose-Fermi mixture in a harmonic trap
We report on the transport of mixed quantum degenerate gases of bosonic 87Rb
and fermionic 40K in a harmonic potential provided by a modified QUIC trap. The
samples are transported over a distance of 6 mm to the geometric center of the
anti-Helmholtz coils of the QUIC trap. This transport mechanism was implemented
by a small modification of the QUIC trap and is free of losses and heating. It
allows all experiments using QUIC traps to use the highly homogeneous magnetic
fields that can be created in the center of a QUIC trap and improves the
optical access to the atoms, e.g., for experiments with optical lattices. This
mechanism may be cascaded to cover even larger distances for applications with
quantum degenerate samples.Comment: 7 pages, 8 figure
A new analysis of scattering from Roy and Steiner type equations
With the aim of generating new constraints on the OZI suppressed couplings of
chiral perturbation theory a set of six equations of the Roy and Steiner type
for the - and -waves of the scattering amplitudes is derived. The
range of validity and the multiplicity of the solutions are discussed. Precise
numerical solutions are obtained in the range E\lapprox 1 GeV which make use
as input, for the first time, of the most accurate experimental data available
at GeV for both and amplitudes.
Our main result is the determination of a narrow allowed region for the two
S-wave scattering lengths. Present experimental data below 1 GeV are found to
be in generally poor agreement with our results. A set of threshold expansion
parameters, as well as sub-threshold parameters are computed. For the latter,
matching with the SU(3) chiral expansion at NLO is performed.Comment: 45 pages, 17 figures. v2: New title, minor correction
Measurement of the Strong Coupling alpha s from Four-Jet Observables in e+e- Annihilation
Data from e+e- annihilation into hadrons at centre-of-mass energies between
91 GeV and 209 GeV collected with the OPAL detector at LEP, are used to study
the four-jet rate as a function of the Durham algorithm resolution parameter
ycut. The four-jet rate is compared to next-to-leading order calculations that
include the resummation of large logarithms. The strong coupling measured from
the four-jet rate is alphas(Mz0)=
0.1182+-0.0003(stat.)+-0.0015(exp.)+-0.0011(had.)+-0.0012(scale)+-0.0013(mass)
in agreement with the world average. Next-to-leading order fits to the
D-parameter and thrust minor event-shape observables are also performed for the
first time. We find consistent results, but with significantly larger
theoretical uncertainties.Comment: 25 pages, 15 figures, Submitted to Euro. Phys. J.
Results of a study of bivalve molluscs of central Asia = Итоги исследования двустворчатых моллюсков Центральной Азии
The article is devoted to many years’ research (1972 - 2001) of bivalve mollusks of Central Asia. It is established that it is inhabited by 51 species of molluscs belonging to 16 genera, 8 families and three orders. Among them 13 species and 1 subgenus are described as new for science. Their ecology, distribution by basin types, byotopes, life forms and economic significance have been studied
Social and environmental factors influencing in-prison drug use
Purpose – There is a strong political imperative to regard the prison as a key social setting for health promotion, but evidence indicates that drug misuse continues to be a significant issue for many prisoners. This paper aims to examine the social and environmental factors within the setting that influence individuals' drug taking. Design/methodology/approach – Focus groups and interviews were conducted with prisoners and staff in three male training prisons in England. The sampling approach endeavoured to gain “maximum variation” so that a broad based understanding of the prison setting could be gathered. The data were analysed in accordance with Attride-Stirling's thematic network approach. Findings – The findings suggest a myriad of social and environmental factors influencing drug use. While staff recognised the scale of the drugs problem, they struggled to cope with creative inmates who were not perturbed by taking risks to gain their supplies. Fellow prisoners played a major role in individuals' decision making, as did the boredom of institutional life and Mandatory Drug Testing (MDT) policies within the institutions. Practical implications – Drug treatment is an essential component of prison healthcare, but it only forms a small part of creating a health-promoting setting. If the health-promoting prison is to be fully realised, a more radical, upstream and holistic outlook is required. Originality/value – The settings approach is an important theoretical and practical approach in health promotion. In comparison to other settings (such as schools), however, there has been limited research on the prison as a health-promoting environment
Are Airlines' Price Setting Strategies Different?
Using a sample of fare quotes for non-stop travel from New York to London, this paper investigates the dynamics of offered fares as the departure date nears. We find that the general trend is toward fare increase at an accelerated rate as the departure date approaches. Clear differences in price-setting strategies among the carriers competing on a particular route are documented
Why Do We Study Soil
The purpose of this resource is to introduce students to the importance of soil. In the first activity, students generate a list of why soils are important. In the second activity, students are asked to describe the five factors that form a unique soil profile and to explore these concepts. In the third activity, students are shown a demonstration of how much soil there is on Earth that is available for human use. Educational levels: Primary elementary, Intermediate elementary, Middle school, High school
Circular 100
Factors influencing calf survival are predation,
insects, weather, diseases, and-ultimately-dam condition. In addition, reindeer calves on the
Seward Peninsula are also subjected to annual herding
and handling. The effects of any of these factors
were unknown in reindeer herds on the Seward Peninsula.
Our objectives were to determine the causes
of mortality, particularly through purportedly high grizzly bear (Ursus arctos) predation; and to determine
the survival rates of reindeer calves in one
herd and provide management recommendations,
based on a simple model, attempting to increase
the herd numbers
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