Quasinormal modes of slowly-rotating black holes in dynamical Chern-Simons gravity

The detection of gravitational waves from compact binary mergers by the LIGO/Virgo collaboration has, for the first time, allowed us to test relativistic gravity in its strong, dynamical and nonlinear regime, thus opening a new arena to confront general relativity (and modifications thereof) against observations. We consider a theory which modifies general relativity by introducing a scalar field coupled to a parity-violating curvature term known as dynamical Chern-Simons gravity. In this theory, spinning black holes are different from their general relativistic counterparts and can thus serve as probes to this theory. We study linear gravito-scalar perturbations of black holes in dynamical Chern-Simons gravity at leading-order in spin and (i) obtain the perturbed field equations describing the evolution of the perturbed gravitational and scalar fields, (ii) numerically solve these equations by direct integration to calculate the quasinormal mode frequencies for the dominant and higher multipoles and tabulate them, (iii) find strong evidence that these rotating black holes are linearly stable, and (iv) present general fitting functions for different multipoles for gravitational and scalar quasinormal mode frequencies in terms of spin and Chern-Simons coupling parameter. Our results can be used to validate the ringdown of small-spin remnants of numerical relativity simulations of black hole binaries in dynamical Chern-Simons gravity and pave the way towards future tests of this theory with gravitational wave ringdown observations

Bilateral internal iliac artery ligation: the procedure of choice in life threatening postpartum haemorrhage

Background: The present study was to assess the indication and study the intraoperative and postoperative complications of bilateral internal iliac artery ligation. Aim of this study was to evaluate the effectiveness of internal iliac artery ligation in arresting postpartum haemorrhage.Methods: This is a retrospective study carried out between January 2015 to December 2018 at Shrimati Kashibai Navale Medical College and General Hospital, Pune. This study included 48 patients with life-threatening PPH. Bilateral internal iliac artery ligation was done by anterior approach in 7 patients and by posterior approach in 41 patients.Results: Intraoperative and postoperative complications were noted in all patients. Of the total patients, 10 required massive blood transfusion and 12 underwent obstetrical hysterectomies (n=12; 25%). Internal iliac vein injury was seen in 1 patient (n=1; 2.08%) and external vein thrombosis was noted in 3 patients (n=3; 6.25%). Maternal mortality was observed in 1 patient due to DIC on day 9 (n=1; 2.08%). The uterine salvage rate was 75%.Conclusions: Internal iliac artery ligation (IIAL) safe, rapid, effective, time tested method of controlling bleeding from genital tract

Research Notes : Heritability and correlation estimates for protein, oil, and crushing hardness in photo-sensitive and insensitive groups of soybean

Protein, oil, and crushing hardness as an indicator of cooking quality are the important seed attributes for which soybean is valued in all parts of the world. Protein and oil content have been reported to be influenced by genetic and climatic factors (Chapman et al., 1976; Shorter et al., 1977) but with respect to crushing hardness attribute of soybean seed, information available in the literature is as good as nil. In the present communication, attempts have been made to understand the nature of genetic effect through heritability and other genetic parameters of variability for both photosensitive and insensitive groups of soybean. Association of these attributes has also been studied

RELATIVE CONTRIBUTIONS TO BASEBALL CATCHER POP TIMES: HIGH SCHOOL AND MAJOR LEAGUE BASEBALL COMPARISON

Pop time (POP) is the measure of how long it takes a catcher to throw to 2nd base calculated from when the ball arrives in his mitt to when it arrives in the fielder’s glove at 2nd base. It has recently been suggested that greater emphasis should be placed on throwing velocity development instead of the ball exchange and throwing motion. The present study determined if the differences in POP characteristics between high school (HS) and Major League Baseball (MLB) catchers indicate a greater contribution from throwing velocity. HS catchers had slower POP characteristics in both exchange and throw phases. Exchange and throw times relative to pop times were nearly identical for HS and MLB, 36.6% and 36.0%, and 63.4% and 64.0%, respectively. The exchange phase exhibited the greatest variability and the most room for improvement. POP percent contribution from the exchange and throw phases between HS and MLB catchers did not change and their absolute values both improved equally. Therefore, it may be beneficial for coaches to design programs that not only strengthen the arm, but also develop efficient ball exchange and catcher throwing mechanics prior to ball release.  Article visualizations

The Use of an Optical Measurement System to Monitor Sports Performance

The purpose of this study was to compare ground contact time between an optical measurement system and a force platform. Participants in this study included six collegiate level athletes who performed drop jumps and sprint strike steps for a total of 15 repetitions each. Ground contact data was simultaneously collected from an optical measurement system and a force platform, at a sampling frequency of 1000 Hz. Data was then analyzed with Pearson’s correlation and paired sample t-tests. The measures from the optical measurement system were found to be significantly higher (p \u3c 0.001) than measures from the force platform in both conditions. Although significantly different, the extremely large relationships (0.979, 0.993) found between the two devices suggest the optical sensor is able to detect similar changes in performance to that of a force platform. Practitioners may continue to utilize optical sensors to monitor performance as it may provide a superior user-friendly alternative to more traditional based monitoring procedures, but must comprehend the inherent limitations due to the design of the optical sensors

Implementing Eccentric Resistance Training—Part 1: A Brief Review of Existing Methods

The purpose of this review was to provide a physiological rationale for the use of eccentric resistance training and to provide an overview of the most commonly prescribed eccentric training methods. Based on the existing literature, there is a strong physiological rationale for the incorporation of eccentric training into a training program for an individual seeking to maximize muscle size, strength, and power. Specific adaptations may include an increase in muscle cross-sectional area, force output, and fiber shortening velocities, all of which have the potential to benefit power production characteristics. Tempo eccentric training, flywheel inertial training, accentuated eccentric loading, and plyometric training are commonly implemented in applied contexts. These methods tend to involve different force absorption characteristics and thus, overload the muscle or musculotendinous unit in different ways during lengthening actions. For this reason, they may produce different magnitudes of improvement in hypertrophy, strength, and power. The constraints to which they are implemented can have a marked effect on the characteristics of force absorption and therefore, could affect the nature of the adaptive response. However, the versatility of the constraints when prescribing these methods mean that they can be effectively implemented to induce these adaptations within a variety of populations