205 research outputs found
Reconsolidation of the soil surface after tillage discontinuity, with and without cultivation, related to erosion and its prediction with RUSLE
A Bayesian analysis of pentaquark signals from CLAS data
We examine the results of two measurements by the CLAS collaboration, one of
which claimed evidence for a pentaquark, whilst the other found no
such evidence. The unique feature of these two experiments was that they were
performed with the same experimental setup. Using a Bayesian analysis we find
that the results of the two experiments are in fact compatible with each other,
but that the first measurement did not contain sufficient information to
determine unambiguously the existence of a . Further, we suggest a
means by which the existence of a new candidate particle can be tested in a
rigorous manner.Comment: 5 pages, 3 figure
First measurement of direct photoproduction on the proton
We report on the results of the first measurement of exclusive
meson photoproduction on protons for GeV and GeV. Data were collected with the CLAS detector at the Thomas
Jefferson National Accelerator Facility. The resonance was detected via its
decay in the channel by performing a partial wave analysis of the
reaction . Clear evidence of the meson
was found in the interference between and waves at GeV. The -wave differential cross section integrated in the mass range of
the was found to be a factor of 50 smaller than the cross section
for the meson. This is the first time the meson has been
measured in a photoproduction experiment
Insulin binding characteristics in canine muscle tissue: effects of the estrous cycle phases
Characterization of rat heart alkaline phosphatase isoenzymes and modulation of activity
Unintended volunteers: The volunteering pathways of working class young people in community sport
Sport has become a major setting for youth volunteering in the UK. Volunteering has become understood as a means of enhancing responsible citizenship and of adding various capitals to young peopleâs identities. Much research on young peopleâs volunteering in sport has typically (and sometimes by default) focused on middle class experiences, highlighting the combination of instrumental and altruistic motives for volunteering, the importance of family and school in decisions about volunteering and its perceived longer-term benefits. This article focuses on the experiences of young working class volunteers and is based on an evaluation of five community sport projects that were part of the StreetGames Building a Participation Legacy from the London 2012 Olympic and Paralympic Games in Disadvantaged Areas initiative. Data from a combination of semi-structured interviews and focus groups were analysed to understand working class young peopleâs volunteering pathways, including their initial engagement, motives and understandings of challenges and benefits. The findings from this study indicate that, in contrast to middle class young people, these young peopleâs routes into volunteering were not part of a strategic career plan, but occurred contingently and with support from coaches. Young people subsequently suggested that volunteering and its scope for gaining formal training helped them to develop skills associated with desirable forms of social and cultural capital that might lead to labour market attachment, particularly in sport. These findings have important implications for understanding how social class shapes pathways into youth volunteering in the UK and for developing appropriate policy to encourage a wider range of young people to volunteer. KEY WORDS Volunteering Young people Community Sport Community Coaching Social Capita
Plasma Sex Steroid Levels and Steroidogenesis in the Gonad of the Self-fertilizing Fish Rivulus marmoratus
The mangrove killifish, Rivulus marmoratus, is the only known self-fertilizing vertebrate. This species is sexually dimorphic; sexually mature individuals are either hermaphrodite or primary and secondary males. Although the mangrove killifish has a unique reproductive strategy, there has been no study on the reproductive endocrinology of this species. Thus we investigated plasma sex steroid hormone levels and steroidogenesis in the gonads of R. marmoratus by enzyme linked immunosorbent assay (ELISA). Plasma 17ÎČ-estradiol (E2) and 11-ketotestosterone (11-KT) were detected both in hermaphrodite and in primary male. Ovarian follicles (follicle-enclosed oocytes) from hermaphrodites, which were categorized into early yolk stage and late yolk stage, and testis tissue of primary males were cultured with different concentrations of 17α-hydroxyprogesterone (OHP) or testosterone (T) for 24 h. Production of T, E2, 11-KT and 17α-20 ÎČ-dihydroxy-4-pregnen-3-one (17α,20ÎČ-P) in the medium from tissue culture were measured by ELISA. Early and late ovarian follicles of hermaphrodites and testis pieces of primary males synchronously secreted E2, 11-KT, and 17α,20ÎČ-P following incubation with OHP or T. We conclude that both hermaphrodite and primary male of the mangrove killifish secrete estrogen, androgen, and progestin synchronously
Deeply Virtual Compton Scattering Beam-Spin Asymmetries
The beam spin asymmetries in the hard exclusive electroproduction of photons
on the proton (ep -> epg) were measured over a wide kinematic range and with
high statistical accuracy. These asymmetries result from the interference of
the Bethe-Heitler process and of deeply virtual Compton scattering. Over the
whole kinematic range (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from
0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible
with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)].
This extensive set of data can thus be used to constrain significantly the
generalized parton distributions of the nucleon in the valence quark sector.Comment: 1 tex file (6 pages), 4 (eps) figure
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