916 research outputs found
Dose-dependent effects of exogenous gonadotrophins on the endometrium of the rat
We compared the serwn levels of oestrogen and progesterone and the endometrial morphology of normal pregnant rats at 5,5 days' gestation with those of pregnant rats given either low (10 IU) or high (20 IU) doses of two gonadotrophins: follicle-stimulating hormone (FSH) and hwnan chorionic gonadotrophin (HCG). Evidence of ovarian hyperstimulation was observed in the high- but not the low-dose group; both treatment regimens caused significant changes in the endometrial surface, epithelial height, the microvillous border, the glycocalyx, the subepithelial stromal cells and the mitotic activity of the surface epithelial and stromal connective tissue cells. The effects of the highdose treatment were Inore severe than those of the low-dose treatment. The serum oestradiol and progesterone levels of the treated groups were not significantly different from those of the control group. The changes in the endometrium after both treatment regimens may interfere with normal trophoblastic-endometrial interactions and could influence the maintenance of pregnancy. This investigation demonstrated that even low doses of gonadotrophins, which do not cause obvious ovarian stimulation, affect uterine morphology. The findings haveimportant implications for in vitro fertilisation and embryo transfer programmes
Psychosocial functioning in adolescents with and without borderline personality disorder.
Little is known about the psychosocial functioning of adolescents with borderline personality disorder (BPD). The main objective of this paper is to compare the psychosocial functioning of a group of adolescents with BPD to a group of psychiatrically healthy adolescents.
The present cross-sectional study included 104 adolescent inpatients with BPD, compared with 60 age-matched psychiatrically healthy comparison subjects. All participants were rigorously diagnosed using three semi-structured interviews: the Structured Clinical Interview for DSM-IV Childhood Diagnoses, the Revised Diagnostic Interview for Borderlines and the Childhood Interview for DSM-IV Borderline Personality. All subjects were also interviewed using the adolescent version of the Background Information Schedule to assess multiple facets of psychosocial functioning.
Adolescents with BPD rated their relationships with their parents as significantly less positive, were more likely to date, but spent more time alone than their healthy counterparts. In addition, adolescents with BPD reported significantly more problems at work and school (i.e. lower frequency of having a good work or school history, higher frequency of being suspended or expelled from school) and significantly lower rates of participation in extra-curricular activities than their healthy counterparts.
Taken together, the results of this study suggest that adolescents with BPD are more impaired in both the social and vocational areas of functioning than psychiatrically healthy comparison subjects. They might also suggest that an overlooked area of strength concerns their relationships with peers. Copyright © 2017 John Wiley & Sons, Ltd
Fast ion transport during applied 3D magnetic perturbations on DIII-D
Measurements show fast ion losses correlated with applied three-dimensional (3D) fields in
a variety of plasmas ranging from L-mode to resonant magnetic perturbation (RMP) edge
localized mode (ELM) suppressed H-mode discharges. In DIII-D L-mode discharges with a
slowly rotating n = 2 magnetic perturbation, scintillator detector loss signals synchronized
with the applied fields are observed to decay within one poloidal transit time after beam turnoff indicating they arise predominantly from prompt loss orbits. Full orbit following using
M3D-C1 calculations of the perturbed fields and kinetic profiles reproduce many features of
the measured losses and points to the importance of the applied 3D field phase with respect
to the beam injection location in determining the overall impact on prompt beam ion loss.
Modeling of these results includes a self-consistent calculation of the 3D perturbed beam ion
birth profiles and scrape-off-layer ionization, a factor found to be essential to reproducing the
experimental measurements. Extension of the simulations to full slowing down timescales,
including fueling and the effects of drag and pitch angle scattering, show the applied n = 3
RMPs in ELM suppressed H-mode plasmas can induce a significant loss of energetic
particles from the core. With the applied n = 3 fields, up to 8.4% of the injected beam power
is predicted to be lost, compared to 2.7% with axisymmetric fields only. These fast ions,
originating from minor radii ρ > 0.7, are predicted to be primarily passing particles lost to
the divertor region, consistent with wide field-of-view infrared periscope measurements of
wall heating in n = 3 RMP ELM suppressed plasmas. Edge fast ion Dα (FIDA) measurements
also confirm a large change in edge fast ion profile due to the n = 3 fields, where the effect
was isolated by using short 50ms RMP-off periods during which ELM suppression was
maintained yet the fast ion profile was allowed to recover. The role of resonances between
fast ion drift motion and the applied 3D fields in the context of selectively targeting regions
of fast ion phase space is also discussed
Inclusive Production of Single Hadrons with Finite Transverse Momenta in Deep-Inelastic Scattering at Next-to-Leading Order
We calculate the cross section for the inclusive production of single hadrons
with finite transverse momenta in deep-inelastic scattering at next-to-leading
order (NLO), i.e. through O(alpha_s^2), in the parton model of QCD endowed with
non-perturbative parton distribution functions (PDFs) and fragmentation
functions (FFs). The NLO correction is found to produce a sizeable enhancement
in cross section, of up to one order of magnitude, bringing the theoretical
prediction to good agreement with recent measurements for neutral pions and
charged hadrons at DESY HERA. This provides a useful test for the universality
and the scaling violations of the FFs predicted by the factorization theorem.
Such comparisons can also be used to constrain the gluon PDF of the proton.Comment: 26 pages, 12 figure
Diffusion and Localization of Cold Atoms in 3D Optical Speckle
In this work we re-formulate and solve the self-consistent theory for
localization to a Bose-Einstein condensate expanding in a 3D optical speckle.
The long-range nature of the fluctuations in the potential energy, treated in
the self-consistent Born approximation, make the scattering strongly velocity
dependent, and its consequences for mobility edge and fraction of localized
atoms have been investigated numerically.Comment: 8 pages, 11 figure
Large- Heavy-Quark Production in Two-Photon Collisions
The next-to-leading-order (NLO) cross section for the production of heavy
quarks at large transverse momenta () in collisions is
calculated with perturbative fragmentation functions (PFF's). This approach
allows for a resummation of terms which
arise in NLO from collinear emission of gluons by heavy quarks at large
or from almost collinear branching of photons or gluons into
heavy-quark pairs. We present single-inclusive distributions in and
rapidity including direct and resolved photons for production of
heavy quarks at colliders and at high-energy colliders.
The results are compared with the fixed-order calculation for finite
including QCD radiative corrections. The two approaches differ in the
definitions and relative contributions of the direct and resolved terms, but
essentially agree in their sum. The resummation of the terms in the PFF approach leads to a softer
distribution and to a reduced sensitivity to the choice of the renormalization
and factorization scales.Comment: 17 pages, Latex, epsf, 7 figures appended as uuencoded file (hardcopy
can be obtained upon request from [email protected]
Large Scale Cross-Correlations in Internet Traffic
The Internet is a complex network of interconnected routers and the existence
of collective behavior such as congestion suggests that the correlations
between different connections play a crucial role. It is thus critical to
measure and quantify these correlations. We use methods of random matrix theory
(RMT) to analyze the cross-correlation matrix C of information flow changes of
650 connections between 26 routers of the French scientific network `Renater'.
We find that C has the universal properties of the Gaussian orthogonal ensemble
of random matrices: The distribution of eigenvalues--up to a rescaling which
exhibits a typical correlation time of the order 10 minutes--and the spacing
distribution follow the predictions of RMT. There are some deviations for large
eigenvalues which contain network-specific information and which identify
genuine correlations between connections. The study of the most correlated
connections reveals the existence of `active centers' which are exchanging
information with a large number of routers thereby inducing correlations
between the corresponding connections. These strong correlations could be a
reason for the observed self-similarity in the WWW traffic.Comment: 7 pages, 6 figures, final versio
Fragmentation Functions for Pions, Kaons, and Protons at Next-to-Leading Order
We present new sets of fragmentation functions for charged pions, charged
kaons, and protons, both at the leading and next-to-leading orders. They are
fitted to the scaled-momentum distributions of these hadrons measured in e+e-
annihilation on the Z-boson resonance at CERN LEP1 and SLAC SLC. These data
partly come as light-, charm-, bottom-quark-enriched and gluon-jet samples,
which allows us to treat all partons independently, after imposing the SU(2)
flavour symmetry relations. In order to gain sensitivity to the scaling
violation in fragmentation, we also include data from SLAC PEP, with
center-of-mass energy root(s)=29 GeV, in our fits. This allows us to also
determine the strong-coupling constant, with a competitive error. LEP1 data on
the longitudinal cross section as well as DESY DORIS and PETRA data at lower
energies nicely agree with theoretical predictions based on our fragmentation
functions.Comment: 28 pages, 11 eps figure
Fragmentation Functions for Light Charged Hadrons with Complete Quark Flavour Separation
We present new sets of next-to-leading order fragmentation functions
describing the production of charged pions, kaons and protons from the gluon
and from each of the quarks, obtained by fitting to all relevant data sets from
e+ e- annihilation. The individual light quark flavour fragmentation functions
are obtained phenomenologically for the first time by including in the data the
light quark tagging probabilities obtained by the OPAL Collaboration
Modulation of Localized States in Electroconvection
We report on the effects of temporal modulation of the driving force on a
particular class of localized states, known as worms, that have been observed
in electroconvection in nematic liquid crystals. The worms consist of the
superposition of traveling waves and have been observed to have unique, small
widths, but to vary in length. The transition from the pure conduction state to
worms occurs via a backward bifurcation. A possible explanation of the
formation of the worms has been given in terms of coupled amplitude equations.
Because the worms consist of the superposition of traveling waves, temporal
modulation of the control parameter is a useful probe of the dynamics of the
system. We observe that temporal modulation increases the average length of the
worms and stabilizes worms below the transition point in the absence of
modulation.Comment: 4 pages, 4 figure
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