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Search Results: 1 - 10 of 325383 matches for " S. Sridharan "
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High Frequency Charging Techniques—Grid Connected Power Generation Using Switched Reluctance Generator  [PDF]
S. Sridharan, S. Sudha
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.714352
Abstract: Power generation becomes the need of developed, developing and under developed countries to meet their increasing power requirements. When affordability increases their requirement of power increases, this happens when increased per capita consumption. The existing power scenario states that highest power is produced using firing of coals called thermal energy. A high efficiency Switched Reluctance Generator (SRG) based high frequency switching scheme to enhance the output for grid connectivity is designed, fabricated and evaluated. This proposed method generates the output for the low wind speed. It provides output at low speed because of multi-level DC-DC converter and storage system. It is an efficient solution for low wind power generation. The real time readings and results are discussed.
Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)
S. Sridharan,S. Sathishkumar
Annales Geophysicae (ANGEO) , 2008,
Abstract: The Mesosphere and Lower Thermosphere (MLT) winds acquired by medium frequency (MF) radar at Tirunelveli (8.7° N, 77.8° E) for the years 1993–2007 are used to study seasonal and interannual variabilities of gravity wave (GW) variances in the altitude region 84–94 km. The GW variances in zonal and meridional winds show semiannual oscillation with maximum variance during March–April and August–September and minimum during June–July and November–December months. The wind variances, in general, are observed to be enhanced during and after the year 1998 and they undergo large interannual variability, in particular, during spring equinox months. An enhancement of GW variances is observed during spring equinox months of the years 2000, 2004 and 2006. These larger GW enhancements, most of the times, coincide with eastward phase of zonally averaged stratospheric QBO at 30 hPa over equator and sudden stratospheric warming occurred at high latitudes. From the zonal and meridional variances, the perturbation ellipses are calculated and they show that the predominant direction of propagation of gravity waves is in SE-NW plane.
Advances in the management of pectus deformities in children  [PDF]
Natalie Swergold, Prasanna Sridharan, Marios Loukas, Ronald S. Chamberlain
Open Journal of Pediatrics (OJPed) , 2013, DOI: 10.4236/ojped.2013.33038

Pectus excavatum (PE) and pectus carinatum (PC) are relatively common deformities involving the anterior chest wall, occurring in 1:1000 and 1:1500 live births, respectively. While the etiology remains an enigma, the association of pectus deformities with other skeletal abnormalities suggests that connective tissue disease may play a role in their pathogenesis. Clinical features of these deformities vary with severity, as determined by the Haller index and Backer ratio, but frequently include cardiac and respiratory abnormalities. Importantly, there exist profound psychosocial implications for children afflicted with these defofrmities, including but not limited to feelings of embarrassment and maladaptive social behaviors. These debilitating characteristics have prompted the development of novel medical and surgical corrective techniques. The correction of pectus deformities reduces the incidence of physiological complications secondary to chest wall malformation, while simultaneously improving body image and psychosocial development in the affected pediatric population. The Ravitch (open) and Nuss (minimally invasive) procedures remain the most frequently employed methods of pectus deformity repair, with no difference in overall complication rates, though individual complication rates vary with treatment. The Nuss procedure is associated with a higher rate of recurrence due to bar migration, hemothorax, and pneumothorax. Postoperative pain management is markedly more difficult in patients who have undergone Nuss repair. Patients undergoing the Ravitch procedure require less postoperative analgesia, but have longer operation times and a larger surgical scar. The cosmetic

results of the Nuss procedure and its minimally invasive nature make it preferable to the Ravitch repair. Newer treatment modalities, including the vacuum bell, magnetic mini-mover procedure (3MP), and dynamic compression bracing (DCB) appear promising, and may ultimately provide effective methods of noninvasive repair. However, these modalities suffer from a lack of extensive published evidence, and the limited number of studies currently published fail to adequately define their long-term effectiveness.

The Utility of Procalcitonin as a Biomarker to Limit the Duration of Antibiotic Therapy in Adult Sepsis Patients  [PDF]
Ronald S. Chamberlain, Brian J. Shayota, Carl Nyberg, Prasanna Sridharan
Surgical Science (SS) , 2014, DOI: 10.4236/ss.2014.58057

Introduction: With rising global antibiotic resistance, stewardship programs aimed at controlling multi-drug resistant (MDR) pathogens have begun to gain acceptance. These programs stress appropriate antibiotic selection, dosage and duration. A growing literature suggests serum procalcitonin (PCT) levels may be useful in guiding antibiotic duration and de-escalation. This report sought to evaluate the evidence-based data available from prospective randomized controlled trials (RCT) on the role of PCT in guiding reductions in antibiotic duration in adult sepsis patients. Methods: A comprehensive search of all published prospective RCT(s) on the use of PCT as a tool for guiding antibiotic therapy in adult sepsis patients was conducted using PubMed, Medline Plus and Google Scholar (2007-2013). Keywords searched included, “procalcitonin”, “sepsis-therapy”, “sepsis biomarker”, “antibiotic duration”, “drug de-escalation”, and “antimicrobial stewardship”. Results: Four RCT(s) involving 826 adult sepsis patients have evaluated the role of serum PCT levels to guide criteria for cessation of antibiotic therapy based either on specific PCT levels or PCT kinetics. Bouadma et al. (N = 621) stopped antibiotics when the PCT concentration was <80% of the peak PCT value, or the absolute PCT concentration was <0.5 μg/L. The PCT arm showed a 2.7-day reduction in antibiotics. Schroeder et al. (N = 27) discontinued antibiotics if clinical signs of infection improved and the PCT value decreased to <1 ng/mL or to <35% of the initial value within three days. The PCT arm had a 1.7-day reduction in antibiotics. Hochreiter

Magnetic tracking of eye position in freely behaving chickens
Jason S. Schwarz,Devarajan Sridharan
Frontiers in Systems Neuroscience , 2013, DOI: 10.3389/fnsys.2013.00091
Abstract: Research on the visual system of non-primates, such as birds and rodents, is increasing. Evidence that neural responses can differ dramatically between head-immobilized and freely behaving animals underlines the importance of studying visual processing in ethologically relevant contexts. In order to systematically study visual responses in freely behaving animals, an unobtrusive system for monitoring eye-in-orbit position in real time is essential. We describe a novel system for monitoring eye position that utilizes a head-mounted magnetic displacement sensor coupled with an eye-implanted magnet. This system is small, lightweight, and offers high temporal and spatial resolution in real time. We use the system to demonstrate the stability of the eye and the stereotypy of eye position during two different behavioral tasks in chickens. This approach offers a viable alternative to search coil and optical eye tracking techniques for high resolution tracking of eye-in-orbit position in behaving animals.
Variabilities of mesospheric tides and equatorial electrojet strength during major stratospheric warming events
S. Sridharan, S. Sathishkumar,S. Gurubaran
Annales Geophysicae (ANGEO) , 2009,
Abstract: The present study demonstrates the relationship between the high latitude northern hemispheric major sudden stratospheric warming (SSW) events and the reversal in the afternoon equatorial electrojet (EEJ), often called the counter-electrojet (CEJ), during the winter months of 1998–1999, 2001–2002, 2003–2004 and 2005–2006. As the EEJ current system is driven by tidal winds, an investigation of tidal variabilities in the MF radar observed zonal winds during the winters of 1998–1999 and 2005–2006 at 88 km over Tirunelveli, a site close to the magnetic equator, shows that there is an enhancement of semi-diurnal tidal amplitude during the days of a major SSW event and a suppression of the same immediately after the event. The significance of the present results lies in demonstrating the latitudinal coupling between the high latitude SSW phenomenon and the equatorial ionospheric current system with clear evidence for major SSW events influencing the day-to-day variability of the CEJ.
Influence of gravity waves and tides on mesospheric temperature inversion layers: simultaneous Rayleigh lidar and MF radar observations
S. Sridharan, S. Sathishkumar,S. Gurubaran
Annales Geophysicae (ANGEO) , 2008,
Abstract: Three nights of simultaneous Rayleigh lidar temperature measurements over Gadanki (13.5° N, 79.2° E) and medium frequency (MF) radar wind measurements over Tirunelveli (8.7° N, 77.8° E) have been analyzed to illustrate the possible effects due to tidal-gravity wave interactions on upper mesospheric inversion layers. The occurrence of tidal gravity wave interaction is investigated using MF radar wind measurements in the altitude region 86–90 km. Of the three nights, it is found that tidal gravity wave interaction occurred in two nights. In the third night, diurnal tidal amplitude is found to be significantly larger. As suggested in Sica et al. (2007), mesospheric temperature inversion seems to be a signature of wave saturation in the mesosphere, since the temperature inversion occurs at heights, when the lapse rate is less than half the dry adiabatic lapse rate.
Rayleigh lidar observations of enhanced stratopause temperature over Gadanki (13.5° N, 79.2° E) during major stratospheric warming in 2006
S. Sridharan, S. Sathishkumar,K. Raghunath
Annales Geophysicae (ANGEO) , 2009,
Abstract: Rayleigh lidar observations of temperature structure and gravity wave activity were carried out at Gadanki (13.5° N, 79.2° E) during January–February 2006. A major stratospheric warming event occurred at high latitude during the end of January and early February. There was a sudden enhancement in the stratopause temperature over Gadanki coinciding with the date of onset of the major stratospheric warming event which occurred at high latitudes. The temperature enhancement persisted even after the end of the high latitude major warming event. During the same time, the UKMO (United Kingdom Meteorological Office) zonal mean temperature showed a similar warming episode at 10° N and cooling episode at 60° N around the region of stratopause. This could be due to ascending (descending) motions at high (low) latitudes above the critical level of planetary waves, where there was no planetary wave flux. The time variation of the gravity wave potential energy computed from the temperature perturbations over Gadanki shows variabilities at planetary wave periods, suggesting a non-linear interaction between gravity waves and planetary waves. The space-time analysis of UKMO temperature data at high and low latitudes shows the presence of similar periodicities of planetary wave of zonal wavenumber 1.
Septic Arthritis of Hip Caused by Salmonella typhi: A Case Report
M. Shanthi,Uma Sekar,K. S. Sridharan
Case Reports in Infectious Diseases , 2012, DOI: 10.1155/2012/464527
Abstract: Salmonella typhi usually produces enteric fever and gastroenteritis. The infection may spread through blood stream and present as local suppurative lesions which may involve any site including the bone and joints. We report a case of septic arthritis of hip in a patient with systemic lupus erthematosis. The case is presented for its rarity and to highlight the atypical manifestations of Salmonella typhi in endemic regions.
Septic Arthritis of Hip Caused by Salmonella typhi: A Case Report
M. Shanthi,Uma Sekar,K. S. Sridharan
Case Reports in Infectious Diseases , 2012, DOI: 10.1155/2012/464527
Abstract: Salmonella typhi usually produces enteric fever and gastroenteritis. The infection may spread through blood stream and present as local suppurative lesions which may involve any site including the bone and joints. We report a case of septic arthritis of hip in a patient with systemic lupus erthematosis. The case is presented for its rarity and to highlight the atypical manifestations of Salmonella typhi in endemic regions. 1. Introduction Infection with Salmonella typhi can result in various presentations such as enteric fever, septicemia with and without local suppurative lesions, gastroenteritis, and the carrier state. The local suppurative lesions may involve any site in the body including the osteoarticular tissue. Though dissemination of infection can occur, septic arthritis due to Salmonella typhi is rare. Most patients with such metastatic infective lesions have underlying chronic disease or immunosuppressive state [1, 2]. We report a case of septic arthritis of hip due to Salmonella typhi in a patient with systemic lupus erythematosis (SLE) who was on long term steroid therapy. 2. Case A 40-year-old male patient was admitted to the orthopedic ward with chief complaints of pain, restriction of movements, and difficulty to bear weight on the left hip. The patient was a known case of SLE and on treatment with prednisolone 40?mg twice daily over the previous 6 years. In addition, he also had complaints of rashes over the trunk and pain in small joints of both hands for 2 months. The patient did not report any episode of fever over the preceding months. There was no history of trauma, prior surgery, or abdominal discomfort. There was no history of illness suggestive of typhoid fever in any of his family members. Local examination of the left hip region showed tenderness and the movements were painfully restricted. The laboratory findings were haemoglobin 9.8?gm%, white blood cell count 13,180 cells/cu.mm with neutrophilic leukocytosis. Peripheral smear showed microcytic normochromic anemia. Pus aspirated from the hip joint was inoculated in brain heart infusion broth, nutrient agar, 5% sheep blood agar, and MacConkey agar and incubated for 24 hours at 37°C. The gram stained smear of the pus showed plenty of polymorphonuclear leucocytes and gram negative bacilli. The culture yielded nonlactose fermenting colonies which was confirmed as Salmonella typhi by biochemical methods and serological typing. It was susceptible to ampicillin, trimethoprim-sulphamethoxazole, chloramphenicol, ciprofloxacin, cefotaxime, and ceftriaxone and resistant to nalidixic
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