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

What have two decades of laboratory life-history evolution studies on Drosophila melanogaster taught us?

A series of laboratory selection experiments on Drosophila melanogaster over the past two decades has provided insights into the specifics of life-history tradeoffs in the species and greatly refined our understanding of how ecology and genetics interact in life-history evolution. Much of what has been learnt from these studies about the subtlety of the microevolutionary process also has significant implications for experimental design and inference in organismal biology beyond life-history evolution, as well as for studies of evolution in the wild. Here we review work on the ecology and evolution of life-histories in laboratory populations of D. melanogaster, emphasizing how environmental effects on life-history-related traits can influence evolutionary change. We discuss life-history tradeoffs-many unexpected-revealed by selection experiments, and also highlight recent work that underscores the importance to life-history evolution of cross-generation and cross-life-stage effects and interactions, sexual antagonism and sexual dimorphism, population dynamics, and the possible role of biological clocks in timing life-history events. Finally, we discuss some of the limitations of typical selection experiments, and how these limitations might be transcended in the future by a combination of more elaborate and realistic selection experiments, developmental evolutionary biology, and the emerging discipline of phenomics

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