2,563 research outputs found
Effect of eight weeks land and sand based plyometric training on selected physical and physiological variables
The purpose of the study was to analyze the effect of eight weeks land based and sand based plyometric training on selected physical and physiological variables among inter collegiate level sportspersons pursuing their graduation under Kuvempu University. Subjects for the study were thirty (30) intercollegiate level sportspersons pursuing their graduation in Shivamogga. Their age ranged between 20 to 25 years. Purposive random sampling was observed in order to ascertain minimum levels of fitness of the sportspersons. Fifteen students each were placed randomly into plyometric training groups namely Land (N=15) and Sand (N=15) surfaces. In order to examine the efficacy of plyometric training on different surfaces following tests were conducted on all the subjects under the study. The subjects underwent these tests twice during the course of study i.e pre-test and post-test. The variables selected for the study were speed, dynamic strength, lower body explosiveness, agility, body composition and resting heart rate. Suitable standard tests were selected for assessing attributes. Paired sample ‘t’ test was used as a statistical technique apart from descriptive statistics. Within the limitations of the present investigation it is concluded that the speed aspect of physical fitness can be significantly enhanced through sand based plyometric training as compared to land based plyometric training
Embedded Clusters in Giant Extragalactic HII Regions III. Extinction and Star Formation
A study of star formation is carried out on 35 giant extragalactic HII
regions (GEHRs) in seven galaxies using optical photometric data in BVR broad
bands and in the emission line of H alpha. Interstellar extinction, metallicity
and nebular contributions to the broad bands are estimated using spectroscopic
data on these objects. Dimensionless diagrams involving B-V and V-R colors and
the flux ratio of Balmer line to B band continuum are used to study star
formation. The cluster colors indicate reduced extinction towards stellar
continuum compared to the values derived from Balmer lines for the ionized gas.
The frequency of detection of classical young (t < 3 Myr) regions with only one
burst of star formation is found to be low as compared to young regions with an
accompanying population rich in red supergiants from a previous burst (t ~ 10
Myr). Reduced extinction towards cluster stars, destruction of ionizing photons
and the existence of older population, often spatially unresolvable from the
younger population, all conspire to make the observed Balmer line equivalent
widths low in a majority of the GEHRs. A scenario of star formation is
suggested which explains many of the observed properties of GEHRs, including
the core-halo structure, reduced extinction for the radiation from stars as
compared to that from the nebular gas, non-detection of young single burst
regions and the co-existence of two populations of different ages.Comment: 18 pages, AASTeX v4.0, 3 tables with aj_pt and 8 postscript figures.
Figure 9 is available on request from [email protected] or at the URL
http://tifrc3.tifr.res.in:2000/ydm/www/preprint.html To appear in
Astronomical Journa
Thermal Analysis of Small Re-Entry Probe
The Small Probe Reentry Investigation for TPS Engineering (SPRITE) concept was developed at NASA Ames Research Center to facilitate arc-jet testing of a fully instrumented prototype probe at flight scale. Besides demonstrating the feasibility of testing a flight-scale model and the capability of an on-board data acquisition system, another objective for this project was to investigate the capability of simulation tools to predict thermal environments of the probe/test article and its interior. This paper focuses on finite-element thermal analyses of the SPRITE probe during the arcjet tests. Several iterations were performed during the early design phase to provide critical design parameters and guidelines for testing. The thermal effects of ablation and pyrolysis were incorporated into the final higher-fidelity modeling approach by coupling the finite-element analyses with a two-dimensional thermal protection materials response code. Model predictions show good agreement with thermocouple data obtained during the arcjet test
Clinical course and management of postoperative methicillin-resistant Staphylococcus aureus keratitis in immunocompromised patients: two case reports
We describe the clinical course and successful treatment of two cases of methicillin- resistant Staphylococcus aureus (MRSA) keratitis. In case 1, MRSA keratitis occurred 5 days after cataract extraction, associated with endophthalmitis; in case 2, diagnosis was made 19 months after penetrating keratoplasty. Treatment in both cases consisted of topical fortified vancomycin and fortified bacitracin. A third topical antibiotic, polymyxin B-trimethoprim, was added to the therapeutic regimen in case 2, one month into the treatment. Oral doxycycline was prescribed to reduce collagenase activity and treat blepharitis. Mupirocin nasal ointment and skin antiseptics were used to decrease and eliminate potential MRSA colonization. Topical prednisolone acetate 1% was applied conservatively to mitigate inflammation in both cases. In case 2, topical cyclosporine A was also used for similar purposes. Keratitis may have worsened while on these immune-modulating drops, especially in case 2, and eradication of infection may have been slowed. Eventually both patients achieved full resolution of infection. Duration of keratitis was 3 and 1.5 months, respectively. Polyantimicrobial therapy is effective in eradicating MRSA-related postoperative keratitis. Topical fortified vancomycin and fortified bacitracin were used in both cases, with a third topical antibiotic, polymyxin B-trimethoprim, also required in case 2. Oral doxycycline, nasal mupirocin, and antiseptic soap may be useful adjuncts in management. Treatment time to achieve full resolution may be prolonged relative to other types of bacterial keratitis. Alterations in immune status may have lengthened the time of treatment. Our two patients were immune compromised and were also susceptible to endophthalmitis. It is possible that topical immune-modulating drops such as prednisolone acetate may potentiate MRSA infection, and if used, should be only done so with great caution
Gain calibration of CCD systems at VBO
The system gain of two CCD systems in regular use at the Vainu Bappu Observatory, Kavalur, is determined at a few gain settings. The procedure used for the determination of system gain and base-level noise is described in detail. The Photometrics CCD system at the 1-m reflector uses a Thomson-CSF TH 7882 CDA chip coated for increased ultraviolet sensitivity. The gain is programme-selected through the parameter ‘cgain’ varying between 0 and 4095 in steps of 1. The inverse system gain for this system varies almost linearly from 27.7 electrons DN-1 at cgain = 0 to 1.5 electrons DN-1 at cgain = 500. The readout noise is ≲ 11 electrons at cgain = 66. The Astromed CCD system at 2.3-m Vainu Bappu Telescope uses a GEC P8603 chip which is also coated for enhanced ultraviolet sensitivity. The amplifier gain is selected in discrete steps using switches in the controller. The inverse system gain is 4.15 electrons DN-1 at the gain setting of 9.2, and the readout noise ~ 8 electrons
Frugal Innovation and Social Innovation: Linked Paths to Achieving Inclusion Sustainably.
This Handbook emphasizes the fundamental shift needed in management scholarship to address global problems and achieve social impact by working towards the UN's Sustainable Development Goals.This will be an invaluable resource for those ..
Novel Constraints on Axions Produced in Pulsar Polar-Cap Cascades
Axions can be copiously produced in localized regions of neutron star
magnetospheres where the ambient plasma is unable to efficiently screen the
induced electric field. As these axions stream away from the neutron star they
can resonantly transition into photons, generating a large broadband
contribution to the neutron star's intrinsic radio flux. In this work, we
develop a comprehensive end-to-end framework to model this process from the
initial production of axions to the final detection of radio photons, and
derive constraints on the axion-photon coupling, , using
observations of 27 nearby pulsars. We study the modeling uncertainty in the
sourced axion spectrum by comparing predictions from 2.5 dimensional
particle-in-cell simulations with those derived using a semi-analytic model;
these results show remarkable agreement, leading to constraints on the
axion-photon coupling that typically differ by a factor of no more than . The limits presented here are the strongest to date for axion masses
, and crucially
do not rely on the assumption that axions are dark matter.Comment: v2: Updated to match published version. Added new SM sections on
analysis and uncertainties, updated plots, and corrected minor bugs and
typos. v1: 5 pages, 2 figures + Supplementary Materia
Detection and estimation of magnetization induced resonances in unilateral nuclear magnetic resonance (NMR) sensors
In this work a systematic identification of factors contributing to signal ringing in unilateral nuclear magnetic resonance (NMR) sensors is conducted. Resonant peaks that originate due to multiple factors such as NMR, electrical, magneto-acoustic, core material response, eddy currents and other factors were observed. The peaks caused by the measurement system or electrical resonances and induced magnet vibrations are further analyzed. They appear in every measurement and are considered as interference to signals received from the magnetic core. Forming a distinction between different peaks is essential in identifying the primary contribution to the captured resonant signal. The measurements for the magnetic core indicate that the magnetization induced resonant peaks of the core have relatively higher amplitudes and shorter decay times at low frequencies
Tuberculosis of the talus in a 2-year-old: a diagnostic dilemma
Extra-pulmonary tuberculosis involving the ankle and foot is a rare entity with its prevalence being ever rarer in the pediatric population. Here, we report the case of a two-year-old female child who presented with a gradually progressive non-traumatic swelling involving the right foot and ankle since two months. The patient was initially managed by a local doctor with immobilization of the foot and ankle in a slab for three weeks. Blood investigations were suggestive of an inflammatory process and a lytic lesion involving the talus was seen on radiographs. The patient was managed with debridement and curettage of the lesion along with anti-tubercular chemotherapy as per pediatric dosage for one year. The patient was asymptomatic at latest follow-up of one year and radiographs showed that lytic lesion had resolved
Combined effect of nonmagnetic and magnetic scatterers on critical temperatures of superconductors with different gap anisotropy
The combined effect of nonmagnetic and magnetic defects and impurities on
critical temperatures of superconductors with different gap anisotropy is
studied theoretically within the weak coupling limit of the BCS model. An
expression is derived which relates the critical temperature to relaxation
rates of charge carriers by nonmagnetic and magnetic scatterers, as well as to
the coefficient of anisotropy of the superconducting order parameter on the
Fermi surface. Particular cases of d-wave, (s+d)-wave, and anisotropic s-wave
superconductors are briefly discussed.Comment: 5 pages, Te
- …