Effect of optical lattice potentials on the vortices in rotating dipolar Bose-Einstein condensates

We study the interplay of dipole-dipole interaction and optical lattice (OL) potential of varying depths on the formation and dynamics of vortices in rotating dipolar Bose-Einstein condensates. By numerically solving the time-dependent quasi-two dimensional Gross-Pitaevskii equation, we analyse the consequence of dipole-dipole interaction on vortex nucleation, vortex structure, critical rotation frequency and number of vortices for a range of OL depths. Rapid creation of vortices has been observed due to supplementary symmetry breaking provided by the OL in addition to the dipolar interaction. Also the critical rotation frequency decreases with an increase in the depth of the OL. Further, at lower rotation frequencies the number of vortices increases on increasing the depth of OL while it decreases at higher rotation frequencies. This variation in the number of vortices has been confirmed by calculating the rms radius, which shrinks in deep optical lattice at higher rotation frequencies.Comment: 10 pages, 7 figure

Instrumentation, Monitoring and Analysis of a Landslide − A Case Study

Powari Landslide which is situated at Km.367 on National Highway-22, on the right bank of river Sutlej in Kinnaur District of Himachal region of North-Western Himalaya has been active since 1987 and recurring every year in the months of July-Sept and March-May. The traffic interruption due to this slide was estimated in one year as 25 full days. 60 half days and 55 less than half days. Money spent each year only to clean the slided debris was estimated approximately from 70,000 to 2,00,000 in Indian rupees. Geological and geotechnical investigations followed by instrumentation and monitoring of this typical landslide was carried out to notice the nature, magnitude, rate and direction of movement on its surface and subsurface part from 1992 to 1995. Remedial measures recommended on the basis of such studies are also described

Modified electroconvulsive therapy as maintenance treatment

Depression is the most common psychiatric condition that significantly affects the quality of life of individual affected with it and it can present with various signs and symptoms. It usually presents with persistent and pervasive sadness of mood, anhedonia, sleep disturbance, reduced appetite, reduced concentration, multiple somatic symptoms, and suicidal thoughts. In this case report a 61-year-old gentleman presented with sadness of mood, loss of interest, sleep disturbance, multiple body aches, and abdominal pain which varied from 2 to 6 weeks. He had failed to respond to multiple classes of antidepressants, mood stabilizers, and antipsychotics. However, he would respond well to modified electroconvulsive therapy and he maintained well for 8-12 months before he had another episode. Since the patient responded well to modified electroconvulsive therapy and to reduce relapse maintenance-electroconvulsive therapy was considered

Vortex dynamics of rotating dipolar Bose-Einstein condensates

We study the influence of dipole-dipole interaction on the formation of vortices in a rotating dipolar Bose-Einstein condensate (BEC) of $^{52}$Cr and $^{164}$Dy atoms in quasi two-dimensional geometry. By numerically solving the corresponding time-dependent mean-field Gross-Pitaevskii equation, we show that the dipolar interaction enhances the number of vortices while a repulsive contact interaction increases the stability of the vortices. Further, an ordered vortex lattice of relatively large number of vortices is found in a strongly dipolar BEC.Comment: 15 pages, 10 figures, 1 tabl

A study on the prevalence of helicobacter pylori infection by rapid urease test in patients undergoing upper gastro intestinal endoscopy for dyspepsia in a tertiary care hospital of Southern Bihar

Background:  The epidemiology of H.pylori is poorly understood and it is a major health issue in developing countries such as India. There is a high incidence of morbidity and mortality due to complications of H.pylori infection. Prevalence of H.pylori differs from country to country, as well as from region to region in the same country. Methods: This observational study was carried out in an outpatient department in a tertiary care hospital of Southern Bihar, and included 163 patients who presented with dyspepsia and fulfilled the criteria of the study and were willing to undergo upper gastrointestinal endoscopy. Result:There is a high prevalence of H.pylori in southern Bihar with significant incidence in the male population and most commonly associated with dyspeptic symptoms.Increased incidence of gastritis was found in RUT positive patients on endoscopic examination

Fortran and C programs for the time-dependent dipolar Gross-Pitaevskii equation in an anisotropic trap

Many of the static and dynamic properties of an atomic Bose-Einstein condensate (BEC) are usually studied by solving the mean-field Gross-Pitaevskii (GP) equation, which is a nonlinear partial differential equation for short-range atomic interaction. More recently, BEC of atoms with long-range dipolar atomic interaction are used in theoretical and experimental studies. For dipolar atomic interaction, the GP equation is a partial integro-differential equation, requiring complex algorithm for its numerical solution. Here we present numerical algorithms for both stationary and non-stationary solutions of the full three-dimensional (3D) GP equation for a dipolar BEC, including the contact interaction. We also consider the simplified one- (1D) and two-dimensional (2D) GP equations satisfied by cigar- and disk-shaped dipolar BECs. We employ the split-step Crank-Nicolson method with real- and imaginary-time propagations, respectively, for the numerical solution of the GP equation for dynamic and static properties of a dipolar BEC. The atoms are considered to be polarized along the z axis and we consider ten different cases, e.g., stationary and non-stationary solutions of the GP equation for a dipolar BEC in 1D (along x and z axes), 2D (in x-y and x-z planes), and 3D, and we provide working codes in Fortran 90/95 and C for these ten cases (twenty programs in all). We present numerical results for energy, chemical potential, root-mean-square sizes and density of the dipolar BECs and, where available, compare them with results of other authors and of variational and Thomas-Fermi approximations.Comment: To download the programs click other and download sourc