Ψ(2s)\Psi(2s) production in p+Ap+A collisions

We have analyzed the data on $\psi'$ production in proton-nucleus ($p+A$) collisions, available from the NA50 Collaboration in the SPS energy domain. The investigated data sets include the absolute production cross sections as well as $\psi'$-to-Drell Yan (DY) cross section ratios. An adapted version of two component QVZ model has been employed to calculate $\psi'$ production cross sections. For both $\psi'$ and DY production, nuclear modifications to the free nucleon structure functions are taken into account. For $\psi'$, final state interaction of the produced $c\bar{c}$ pairs with the nuclear medium is also taken into account, in accordance with the previously analyzed $J/\psi$ data. A satisfactory description of the data in $p+A$ collisions is obtained. Model calculations are extrapolated to low energy regime to predict the $\psi'$ suppression in proton induced collisions at near threshold energies.Comment: 6 pages, 14 figures. Extensively revised, new figures adde

Ultrafast chemistry in complex and confined systems

Self-organized molecular assemblies play a crucial role in many natural and biological processes. Recent applications of ultrafast laser spectroscopy and computer simulations revealed that chemistry in a confined environment is fundamentally different from that in ordinary solutions. Many recent examples of slow dynamics in constrained environments and their biological implications are discussed

Sample dispersion in isotachophoresis with Poiseuille counterflow

A particular mode of isotachophoresis (ITP) employs a pressure-driven flow opposite to the sample electromigration direction in order to anchor a sample zone at a specific position along a channel or capillary. We investigate this situation using a two-dimensional finite-volume model based on the Nernst-Planck equation. The imposed Poiseuille flow profile leads to a significant dispersion of the sample zone. This effect is detrimental for the resolution in analytical applications of ITP. We investigate the impact of convective dispersion, characterized by the area-averaged width of a sample zone, for various values of the sample P\'{e}clet-number, as well as the relative mobilities of the sample and the adjacent electrolytes. A one-dimensional model for the area-averaged concentrations based on a Taylor-Aris-type effective axial diffusivity is shown to yield good agreement with the finite-volume calculations. This justifies the use of such simple models and opens the door for the rapid simulation of ITP protocols with Poiseuille counterflow

Failure of intrauterine contraception in a multigravida lady with an undiagnosed uterus didelphys: a case report

Uterus didelphys remains one of the rarest uterine anomalies partly because; majority women experience no symptoms with an uneventful reproductive life. Despite the cost-effectiveness and efficacy paired with fewer side effects and convenience of using an intrauterine contraceptive device, it is most likely to prove futile in an unsuspected case of didelphic uterus resulting in an unintended pregnancy. Hence, intrauterine contraception is generally considered a contraindication in cases of uterine malformations. We present a case of a multigravida mother (G7 P3 L3 A3) with a history of three term vaginal deliveries, with an undiagnosed uterus didelphys, carrying a single live intrauterine pregnancy of approximately 6 weeks period of gestation, in the right uterine horn and a copper containing intrauterine contraceptive device in the left uterine horn, willing to undergo medical termination of pregnancy. A high index of suspicion, on the part of the gynaecologist as well as the radiologist, is required to investigate concurrent pregnancy with a history of an intrauterine contraceptive device insertion, in order to rule out rarer uterine malformations like uterus didelphys. Thorough history taking and clinical examination accompanied by improved imaging techniques should be performed at the time of first pregnancy in order to avoid an unsuitable placement of an intrauterine contraceptive device

Isospin asymmetric nuclear matter and properties of axisymmetric neutron stars

Pure hadronic compact stars, above a limiting value ($\approx$1.6 M$_\odot$) of their gravitational masses, to which predictions of most of other equations of state (EoSs) are restricted, can be reached from the equation of state (EoS) obtained using DDM3Y effective interaction. This effective interaction is found to be quite successful in providing unified description of elastic and inelastic scattering, various radioactivities and nuclear matter properties. We present a systematic study of the properties of pure hadronic compact stars. The $\beta$-equilibrated neutron star matter using this EoS with a thin crust is able to describe highly-massive compact stars, such as PSR B1516+02B with a mass M=1.94$^{+0.17}_{-0.19}$ M$_\odot$ and PSR J0751+1807 with a mass M=2.1$\pm$0.2 M$_\odot$ to a 1$\sigma$ confidence level.Comment: 5 pages, 4 figure