20,418 research outputs found
Investigation into the molecular mechanism of the antiapoptotic functions of CTCF in breast cancer cells using a proteomics approach
Endometrial polyps in postmenopausal women
The malignancy risk of endometrial polyps in postmenopausal women was correlated with the presence or absence of abnormal uterine bleeding. Of 481 postmenopausal women who presented with endometrial polyps at diagnostic hysteroscopy between 2004 and 2007, 48.9% were asymptomatic and 51.1% had postmenopausal uterine bleeding. Transvaginal ultrasound revealed abnormal endometrial thickness in 60.0% vs. 57.7%, polyps in 37.9% vs. 32.9%, endometrial tumors in 1.3% vs. 0.8%, and submucosal myomas in 0.9% vs. 2.0% by the absence or presence of bleeding. Around three-fourth of the polyps were removed. Histopathologic diagnoses showed mucous polyps in 93.7 of asymptomatic women compared to 80.7% of those with bleeding, while endometrial tumors were only seen in those bleeding (7.2%). The malignancy risk within endometrial polyps in postmenopausal women varies with the presence of vaginal bleeding, and is minimal in asymptomatic women
Spin texture and magnetoroton excitations at nu=1/3
Neutral spin texture (ST) excitations at nu=1/3 are directly observed for the first time by resonant inelastic light scattering. They are determined to involve two simultaneous spin flips. At low magnetic fields, the ST energy is below that of the magnetoroton minimum. With increasing in-plane magnetic field these mode energies cross at a critical ratio of the Zeeman and Coulomb energies of eta(c)=0.020 +/- 0.001. Surprisingly, the intensity of the ST mode grows with temperature in the range in which the magnetoroton modes collapse. The temperature dependence is interpreted in terms of a competition between coexisting phases supporting different excitations. We consider the role of the ST excitations in activated transport at nu=1/3
Paraovarian tumor of borderline malignancy: a case report
A case of a 23-year-old woman with a paraovarian tumor is presented. The patient complained of pelvic pain and abdominal swelling. Cystectomy was the initial surgical treatment, but after the histological diagnosis, a staging surgery was carried out. The clinical aspects and subsequent management of related cases are discussed, and a literature review is made
Universal Conductance Distribution in the Quantum Size Regime
We study the conductance (g) distribution function of an ensemble of isolated
conducting rings, with an Aharonov--Bohm flux. This is done in the discrete
spectrum limit, i.e., when the inelastic rate, frequency and temperature are
all smaller than the mean level spacing. Over a wide range of g the
distribution function exhibits universal behavior P(g)\sim g^{-(4+\beta)/3},
where \beta=1 (2) for systems with (without) a time reversal symmetry. The
nonuniversal large g tail of this distribution determines the values of high
moments.Comment: 13 pages+1 figure, RevTEX
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Interaction of Void Spacing and Material Size Effect on Inter-Void Flow Localization
The ductile fracture process in porous metals due to growth and coalescence of micron scale voids is not only affected by the imposed stress state but also by the distribution of the voids and the material size effect. The objective of this work is to understand the interaction of the inter-void spacing (or ligaments) and the resultant gradient induced material size effect on void coalescence for a range of imposed stress states. To this end, three dimensional finite element calculations of unit cell models with a discrete void embedded in a strain gradient enhanced material matrix are performed. The calculations are carried out for a range of initial inter-void ligament sizes and imposed stress states characterised by fixed values of the stress triaxiality and the Lode parameter. Our results show that in the absence of strain gradient effects on the material response, decreasing the inter-void ligament size results in an increase in the propensity for void coalescence. However, in a strain gradient enhanced material matrix, the strain gradients harden the material in the inter-void ligament and decrease the effect of inter-void ligament size on the propensity for void coalescence
Fundamental Aspects of the ISM Fractality
The ubiquitous clumpy state of the ISM raises a fundamental and open problem
of physics, which is the correct statistical treatment of systems dominated by
long range interactions. A simple solvable hierarchical model is presented
which explains why systems dominated by gravity prefer to adopt a fractal
dimension around 2 or less, like the cold ISM and large scale structures. This
has direct relation with the general transparency, or blackness, of the
Universe.Comment: 6 pages, LaTeX2e, crckapb macro, no figure, uuencoded compressed tar
file. To be published in the proceeedings of the "Dust-Morphology"
conference, Johannesburg, 22-26 January, 1996, D. Block (ed.), (Kluwer
Dordrecht
Vortex Depinning in a Two-Dimensional Superfluid
\ua9 The Author(s) 2024.We employ the Gross–Pitaevskii theory to model a quantized vortex depinning from a small obstacle in a two-dimensional superfluid due to an imposed background superfluid flow. We find that, when the flow’s velocity exceeds a critical value, the vortex drifts orthogonally to the flow before subsequently moving parallel to it away from the pinning site. The motion of the vortex around the pinning site is also accompanied by an emission of a spiral-shaped sound pulse. Through simulations, we present a phase diagram of the critical flow velocity for vortex depinning together with an empirical formula that illustrates how the critical velocity increases with the height and width of the pinning site. By employing a variety of choices of initial and boundary conditions, we are able to obtain lower and upper bounds on the critical velocity and demonstrate the robustness of these results
Interaction of Void Spacing and Material Size Effect on Inter-Void Flow Localization
The ductile fracture process in porous metals due to growth and coalescence
of micron scale voids is not only affected by the imposed stress state but also
by the distribution of the voids and the material size effect. The objective of
this work is to understand the interaction of the inter-void spacing (or
ligaments) and the resultant gradient induced material size effect on void
coalescence for a range of imposed stress states. To this end, three
dimensional finite element calculations of unit cell models with a discrete
void embedded in a strain gradient enhanced material matrix are performed. The
calculations are carried out for a range of initial inter-void ligament sizes
and imposed stress states characterised by fixed values of the stress
triaxiality and the Lode parameter. Our results show that in the absence of
strain gradient effects on the material response, decreasing the inter-void
ligament size results in an increase in the propensity for void coalescence.
However, in a strain gradient enhanced material matrix, the strain gradients
harden the material in the inter-void ligament and decrease the effect of
inter-void ligament size on the propensity for void coalescence
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