Some theorems on stability of discrete circulatory systems

Stability theorems established for static and dynamic losses in discrete, linear, elastic system

Destabilizing effect of velocity-dependent forces in nonconservative continuous systems Technical report no. 65-4

Velocity dependent force destabilizing effect in cantilevered continuous pipe conveying fluid at constant velocit

FLAGCAL:A flagging and calibration package for radio interferometric data

We describe a flagging and calibration pipeline intended for making quick look images from GMRT data. The package identifies and flags corrupted visibilities, computes calibration solutions and interpolates these onto the target source. These flagged calibrated visibilities can be directly imaged using any standard imaging package. The pipeline is written in "C" with the most compute intensive algorithms being parallelized using OpenMP.Comment: 15 Pages, 6 figures, 2 Tables, Accepted for publication in the Experimental Astronomy Journa

Instability of Rotationally Tuned Dipolar Bose-Einstein Condensates

The possibility of effectively inverting the sign of the dipole-dipole interaction, by fast rotation of the dipole polarization, is examined within a harmonically trapped dipolar Bose-Einstein condensate. Our analysis is based on the stationary states in the Thomas-Fermi limit, in the corotating frame, as well as direct numerical simulations in the Thomas-Fermi regime, explicitly accounting for the rotating polarization. The condensate is found to be inherently unstable due to the dynamical instability of collective modes. This ultimately prevents the realization of robust and long-lived rotationally tuned states. Our findings have major implications for experimentally accessing this regime.Comment: 9 pages with 5 figure

Efficacy of bipolar hemiarthroplasty in the elderly people: a study in a tertiary care centre

Background: Intertrochanteric fractures are associated with severe displacement and comminution are very common among the elderly patients especially women. Hemiarthroplasty is a procedure, where the head of the femur is replaced with a prosthetic implant. This study was performed to evaluate the efficacy of the bipolar hemiarthroplasty among the elderly patients with intra capsular fractures.Methods: Bipolar hemiarthroplasty with or without cement was performed on 77 patients above the age of 60 years with femoral neck fractures.Results: Out of the 77 patients, 79.2% were females and 20.8% were males. The mean age of all the patients was 68.4 years. Type IV was found to be most common among the elderly. The outcome of the surgery was excellent in more than 75% of the cases. Only one patient had a poor outcome. The most common complication of the surgery was limb shortening in 5.2% patients followed by superficial infections in 2.6%. Conclusions: Bipolar hemiarthroplasty for the unstable hip fractures in the elderly has good results with early mobilizations and minimal complications. This ultimately affects the general health of the patients and reduces morbidity and mortality

Treatment of open tibial shaft fractures using intra medullary interlocking

Background: It has been estimated that annual incidence of open fractures of long bones is 11.5 per 100 000 personswith 40% occurring in the lower limb and commonest site is the tibial diaphysis. This study was performed to evaluate clinical outcome of patients with open fracture of shaft of tibia.Methods: It was a hospital based observational prospective study was performed on a total of 30 study participants were enrolled and out of them 2 were lost to follow up. After discharge follow up was done every four weeks for clinical, radiological progress of bony union and soft tissue healing.Results: Majority of the study participants were in the age group of 31-40 years (37%). Males were the main study participant (63.3%). The process of healing took for about 13-16 weeks in 57.1% of the study participants were as in 18% of them it healed within 12 weeks. In 25% of the study participants the healing was completed in more than 16 weeks. Conclusions: It has been observed from the study that interlocked intramedullary nailing is a very effective and safe and technique for the management of open tibial fractures

A study to assess epidemiological, clinical profile and outcome of Monteggia fracture dislocation in adults: a retrospective study

Background: Among all the forearm fractures Monteggia fractures account for approximately 1-2%. Early recognition with anatomical reduction and stable internal fixation is most important in the management of Monteggia fractures. This study was performed to evaluate clinical profile and functional outcome of Monteggia fracture dislocation.Methods: This retrospective study was done on 381 forearm fractures, out of which 31 were Monteggia fracture dislocation. All adults patients who were >20 years were included in the study.Results: During the study period, of 381 cases 31 (8.1%) were having Monteggia fracture dislocation. Most of the study participants were males in (61.2%) compared to females (39%). The cause of the fracture in most of the cases was road traffic accidents accounted by 45%. In most of the cases, the outcome of the operation was excellent (61.3%). Conclusions: If the injury is properly classified and if stable anatomical reduction is achieved at the proper time then the results will always be excellent. In present study all the patients achieved excellent results after surgery