Amplification of Fluctuations in Unstable Systems with Disorder

We study the early-stage kinetics of thermodynamically unstable systems with quenched disorder. We show analytically that the growth of initial fluctuations is amplified by the presence of disorder. This is confirmed by numerical simulations of morphological phase separation (MPS) in thin liquid films and spinodal decomposition (SD) in binary mixtures. We also discuss the experimental implications of our results.Comment: 15 pages, 4 figure

Economic Aseismic Design of Rigid Retaining Wall

Rigid retaining walls experience significant displacements during earthquakes. Several investigators have developed 1- D and 2-D models to predict displacements. A critical review of the state of the art shows that these model may not predict realistic displacements Wu (1999). A new 2-D model, which considers strain dependant soil stiffness and material damping, sliding and rocking motions, and practical field water conditions behind the wall as per Eurocode (1994) has been developed (Wu 1999). This model represents a considerable advance over the existing solutions and is easily useable by the practicing engineer. It has been shown that walls inclined on the back fill offer several technical advantage

Displacement Analysis of Rigid Retaining Walls in Rocking

The paper presents a simple approach for computing rotational displacements of rigid retaining walls during an earthquake, an aspect that had not been considered so far (1981). The values of rotational displacements using the proposed method for various combinations of wall geometry, backfill material and ground motion parameters have been worked out. The values of rotational displacements have been compared with the values obtained by using available approaches for displacement analysis (sliding or overall) for rigid retaining walls and it is shown that the contribution of rotation to the overall displacement of the retaining wall may be quite significant in some cases and should therefore, be accounted for. The necessity to develop a rational displacement analysis considering combined rocking and sliding is stressed

Entanglement in the dispersive interaction of trapped ions with a quantized field

The mode-mode entanglement between trapped ions and cavity fields is investigated in the dispersive regime. We show how a simple initial preparation of Gaussian coherent states and a postselection may be used to generate motional non-local mesoscopic states (NLMS) involving ions in different traps. We also present a study of the entanglement induced by dynamical Stark-shifts considering a cluster of N-trapped ions. In this case, all entanglement is due to the dependence of the Stark-shifts on the ions' state of motion manifested as a cross-Kerr interaction between each ion and the field.Comment: 10 pages, 5 figures, corrected typo

Quantum ergodicity and entanglement in kicked coupled-tops

We study the dynamical generation of entanglement as a signature of chaos in a system of periodically kicked coupled-tops, where chaos and entanglement arise from the same physical mechanism. The long-time averaged entanglement as a function of the position of an initially localized wave packet very closely correlates with the classical phase space surface of section -- it is nearly uniform in the chaotic sea, and reproduces the detailed structure of the regular islands. The uniform value in the chaotic sea is explained by the random state conjecture. As classically chaotic dynamics take localized distributions in phase space to random distributions, quantized versions take localized coherent states to pseudo-random states in Hilbert space. Such random states are highly entangled, with an average value near that of the maximally entangled state. For a map with global chaos, we derive that value based on new analytic results for the typical entanglement in a subspace defined by the symmetries of the system. For a mixed phase space, we use the Percival conjecture to identify a "chaotic subspace" of the Hilbert space. The typical entanglement, averaged over the unitarily invariant Haar measure in this subspace, agrees with the long-time averaged entanglement for initial states in the chaotic sea. In all cases the dynamically generated entanglement is predicted by a unitary ensemble of random states, even though the system is time-reversal invariant, and the Floquet operator is a member of the circular orthogonal ensemble.Comment: 12 pages with 8 figure

Reproductive endocrine effects of intranasal administration of norethisterone to adult female rhesus monkeys (Macaca mulatta)

Intranasal administration of norethisterone at a daily dose of 9 μg between Days 5 and 14 of the menstrual cycles blocked ovulation in 10 out of 17 adult female monkeys. Serum concentrations of hormones indicated that ovulation was blocked due to a suppression of the mid-cycle, oestradiol-induced LH surge. Ovarian follicular activity in the treated menstrual cycles was not affected by norethisterone but there was a marked delay in the onset of the mid-cycle oestradiol surge in most of the treated animals. The duration of the menstrual cycle length after the oestradiol peak was significantly reduced in all the treated monkeys, indicative of a shortened luteal phase

Clinical Utility of Intra-Operative 6 Hydroxyethyl Starch (130 / 0.4) Supplementation in Hypoxemic Femur Injury Patients: A Preliminary Report of Twenty Cases

Abstract: Posttraumatic intravasation of fat and debris can lead to a cascade of events. Hydroxyethyl starches (HES) markedly suppress neutrophil influx by decreasing pulmonary capillary permeability and facilitating tissue oxygenation by improving microcirculation. It was hypothesized that in hypoxemic femur injury patients undergoing operative stabilization, HES administration will prevent the deterioration of respiratory variables and facilitates recovery. This prospective, double-blind, randomized preliminary study, enrolled twenty posttraumatic hypoxemic patients (room air PaO2 5) scheduled for femur fracture stabilization under general anesthesia. Patients were allocated to receive either; 6% HES 130/0.42, 15 mL/kg or 0.9% normal saline (NS) to maintain their central venous pressure (CVP) 12 + 2 mm Hg. Blood was transfused according to the maximum allowable blood loss and by serial hematocrit estimations. Perioperative Glasgow Coma Scale (GCS), physiological variables, arterial oxygen saturation (SpO2), arterial blood gas (ABG), SS and P/F ratios were recorded until recovery. The partial pressure of oxygen in arterial blood / fraction of inspired oxygen ratio (PaO2/FiO2) improved from a preoperative value of 273.33 ± 13.05 to 435.70 in the 6% Hydroxyethyl starch group (HES) and from 275.24 ± 15.34 to 302.25 ± 70.35 in the NS group over a period of six days (P values =0.970, 0.791, 0.345, 0.226, 0.855, 0.083, 0.221). Time taken to achieve a P/F ratio > 300 and for persistent reduction of Murray’s lung injury score (LIS) were comparable (P = 0.755 and 0.348, respectively). The number of ventilator, intensive care unit (ICU) and hospital stay days, did not differ (P value = 0.234, 1.00, 0. 301, respectively). There were no adverse sequelae or mortalities. A trend showing relatively fast improvement in the P/F ratio and an early reduction in LIS values was observed in hypoxemic, femur injury patients receiving intraoperative colloid supplementation

Bogoliubov transformations and exact isolated solutions for simple non-adiabatic Hamiltonians

We present a new method for finding isolated exact solutions of a class of non-adiabatic Hamiltonians of relevance to quantum optics and allied areas. Central to our approach is the use of Bogoliubov transformations of the bosonic fields in the models. We demonstrate the simplicity and efficiency of this method by applying it to the Rabi Hamiltonian.Comment: LaTeX, 16 pages, 1 figure. Minor additions and journal re

Double intra venous cannula versus single needle technique of aspiration and methylprednisolone injection in the treatment of wrist ganglion: a comparative study

Background: Ganglion is the one of the common soft tissue swellings in the hand and wrist. Treatment options available include reassurance, nonsurgical means like aspiration with or without steroid or hyaluronidase injection and surgical or arthroscopic excision. All current treatment options produce suboptimal results. This study endeavours to compare the outcome and recurrence rate and other complications after treatment of wrist ganglion by aspiration and methylprednisolone injection by double Intravenous cannula versus single needle technique.Methods: A prospective comparative clinical study was done with a total of 72 patients. 36 patients in group 1 were treated with double intravenous cannula technique and 36 patients in group 2 were treated with single needle technique. All the patients were followed up for 6 months to look for recurrence and any complication. The patient’s age, sex and various characteristics of the ganglion cyst like side, site, size, etc. were recorded.Results: In group 1, recurrence was seen in 6 patients (15.7%) while in group 2, recurrence were seen in 14 (38.8%) patients. There was statistical significant difference between the two groups with p value of 0.04. No complication was seen in both groups due to methylprednisolone injection.Conclusions: Inspired by the results we advise to use aspiration and methylprednisolone injection by double intravenous cannula technique in the treatment of wrist ganglion before any surgical intervention. It is safe, simple, cost effective method and is less invasive and less time consuming with recurrence rate comparable to surgical and arthroscopic interventions