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Search Results: 1 - 10 of 131781 matches for " Sandeep V. Rode "
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A Review on Techniques for Reduction of Harmonic Distortion
Sandeep V. Rode,Siddharth. A. Ladhake
International Journal of Electrical and Power Engineering , 2012, DOI: 10.3923/ijepe.2011.62.64
Abstract: In recent decades, the growing and widespread use of electronic equipment by different segment of society is perceptible. This equipment present itself as nonlinear impedesdances to its supplying electrical systems and generates harmonics with well-known adverse effects such as low power factor, electromagnetic interface, voltage distortion, etc. These disturbances have required researchers to present solution to minimize or eliminate them. This study has reviewed, the aim and techniques for reduction of harmonic distortion. Wide arrays of approaches have been discussed.
Is the ultra-fast transformation of bismuth non-thermal?
E. G. Gamaly,A. V. Rode
Physics , 2009,
Abstract: Transient state of femtosecond laser excited bismuth has been studied by various groups with time-resolved optical, x-ray, and electron probes at the deposited energy density from below through up to several times the equilibrium enthalpy of melting. However, the interpretations of the experimental results are controversial: the optical probes reveal the absence of transition to the melting phase while the authors of x-ray and electron diffraction experiments claim the observation of ultrafast non-thermal melting. The presented analysis, based on temperature dependence of bismuth optical properties, unequivocally shows a purely thermal nature of all the observed fs-laser induced transformations in bismuth.
Aqueous Interleukin-6 (IL-6) Level Is a Marker for Treatment Resistance to Bevacizumab in Age-Related Macular Degeneration —Aqueous Cytokines after Bevacizumab  [PDF]
Kakarla V. Chalam, Sandeep Grover, Sankarathi Balaiya, Ravi K. Murthy
Open Journal of Ophthalmology (OJOph) , 2014, DOI: 10.4236/ojoph.2014.41005
Abstract:

Background: To prospectively evaluate the effect of intravitreal bevacizumab on aqueous levels of interleukin-6 (IL-6) and vascular endothelial growth factor (VEGF) in patients with exudative age-related macular degeneration (AMD) and to correlate clinical outcomes of patients and aqueous cytokine levels before and after injection. Methods: The study group consisted of 30 eyes from 30 patients with exudative AMD who underwent intravitreal injection of bevacizumab three times at monthly intervals. The aqueous samples prior to the 1st injection (baseline) and 3rd injection were analyzed for VEGF and IL-6 levels, evaluating the effect of 2 doses of intravitreal bevacizumab. Study patients were sub-grouped based upon change in central subfield (CSF) macular thickness on SD-OCT, at 8 weeks. Group 1 included patients (n = 14) with a decrease in CSF thickness greater than 10% from the baseline and were categorized to have improved. Group 2 included patients (n = 16) who had a decrease in CSF thickness 10% or less and were considered treatment-resistant. Results: There was no statistically significant change in aqueous VEGF and IL-6 levels after intravitreal bevacizumab. In sub-group analysis, in both Groups 1 and 2 patients, aqueous IL-6 levels showed a better correlation with CSF thickness on SD-OCT (r =

Small intestinal strictures as a complication of mesenteric vessel thrombosis: two case reports
Sandeep Patel, Shashank V Gurjar
Journal of Medical Case Reports , 2009, DOI: 10.4076/1752-1947-3-8623
Abstract: We present two cases of abdominal pain, one acute and one chronic, in which the eventual diagnosis was of bowel strictures secondary to arterial and venous vessel thrombosis. In both patients, a Caucasian male aged 67 and a Caucasian female aged 78, the diagnosis was delayed because of the infrequency of their presentation. Both patients eventually underwent a resection of the affected portion of bowel with primary anastamosis and made uneventful recoveries.There are multiple medical and surgical management options for small bowel strictures and these depend on the aetiology of the stricture. Ischaemic small bowel strictures represent a difficult diagnosis and the potential resulting delay may be partially responsible for increased morbidity. Barium small bowel follow-through should be used in making the diagnosis.Small intestinal strictures secondary to mesenteric vessel thrombosis are a rare entity and thus often result in delayed diagnosis. The patient often presents with chronic bouts of abdominal pain associated with symptoms of intermittent small bowel obstruction. Results of routine investigations are often normal and subsequently diagnosis and often treatment can be difficult. We present two cases and highlight possible investigative and management strategies.A 67-year-old Caucasian man presented acutely with a 5-day history of recurrent bouts of epigastric pain, nausea and vomiting. His previous surgical history included coronary artery bypass surgery, appendicectomy and open cholecystectomy with subsequent surgery for recurrent incisional hernia. No personal or family history of thrombosis-related conditions was given. On examination, he had low grade pyrexia but was cardiovascularly stable. Abdominal examination revealed mild distension with tenderness in the epigastrium and right hypochondrium.Initial investigations revealed leucocytosis and a raised C-reactive protein level. He underwent medical review to rule out a cardiac aetiology (normal electrocard
Trust Negotiations Using Cryptographic Approach
Sandeep.V,,Gitanjali .J
International Journal on Computer Science and Engineering , 2011,
Abstract: Security involves , any person or an organization has certain entities or attributes which cannot be disclosed directly to any other organization or third person , so the main idea of our project is to safe guard or encrypt the very sensitive entities of a person or organization by encrypting them by using the public key generated and decrypting them by using the private key which is generated at the initial key generation stage. After which public key is used for the encryption and generated private key pair is used at the time of decryption.
The covert set-cover problem with application to Network Discovery
Sandeep Sen,V. N. Muralidhara
Computer Science , 2012,
Abstract: We address a version of the set-cover problem where we do not know the sets initially (and hence referred to as covert) but we can query an element to find out which sets contain this element as well as query a set to know the elements. We want to find a small set-cover using a minimal number of such queries. We present a Monte Carlo randomized algorithm that approximates an optimal set-cover of size $OPT$ within $O(\log N)$ factor with high probability using $O(OPT \cdot \log^2 N)$ queries where $N$ is the input size. We apply this technique to the network discovery problem that involves certifying all the edges and non-edges of an unknown $n$-vertices graph based on layered-graph queries from a minimal number of vertices. By reducing it to the covert set-cover problem we present an $O(\log^2 n)$-competitive Monte Carlo randomized algorithm for the covert version of network discovery problem. The previously best known algorithm has a competitive ratio of $\Omega (\sqrt{n\log n})$ and therefore our result achieves an exponential improvement.
Efficient Beam Converter for the Generation of Femtosecond Vortices
Vladlen G. Shvedov,Cyril Hnatovsky,Wieslaw Krolikowski,Andrei V. Rode
Physics , 2010,
Abstract: We describe an optical beam converter for an efficient transformation of Gaussian femtosecond laser beams to single- or double-charge vortex beams showing no spatial or topological charge dispersion. The device achieves a conversion efficiency of 75% for single- and 50% for double-charge vortex beams and can operate with high energy broad bandwidth pulses. We also show that the topological charge of a femtosecond vortex beam can be determined by analyzing its intensity distribution in the focal area of a cylindrical lens.
Materials processing with tightly focused femtosecond vortex laser beams
Cyril Hnatovsky,Vladlen G. Shvedov,Wieslaw Krolikowski,Andrei V. Rode
Physics , 2010, DOI: 10.1364/OL.35.003417
Abstract: This letter is the first demonstration of material modification using tightly focused femtosecond laser vortex beams. Double-charge femtosecond vortices were synthesized with the polarization-singularity beam converter described in Ref [1] and then focused using moderate and high numerical aperture optics (viz., NA = 0.45 and 0.9) to ablate fused silica and soda-lime glasses. By controlling the pulse energy we consistently machine high-quality micron-size ring-shaped structures with less than 100 nm uniform groove thickness.
Materials processing with a tightly focused femtosecond vortex laser pulse
Cyril Hnatovsky,Vladlen G. Shvedov,Wieslaw Krolikowski,Andrei V. Rode
Physics , 2010,
Abstract: This letter is the first demonstration of material modification using tightly focused femtosecond laser vortex beams. Double-charge femtosecond vortices were synthesized with the polarization-singularity beam converter described in Ref [1] and then focused using moderate and high numerical aperture optics (viz., NA = 0.45 and 0.9) to ablate fused silica and soda-lime glasses. By controlling the pulse energy we consistently machine high-quality micron-size ring-shaped structures with less than 100 nm uniform groove thickness.
Influence of Supernova SN Ia Rate and the Early Star Formation Rate on the Galactic Chemical Evolution  [PDF]
Sandeep Sahijpal
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33038
Abstract:

Based on the recently developed numerical approach to understand the formation and the chemical evolution of the milky-way galaxy in the solar neighborhood we study the influence of the supernova type SN Ia rates on the galactic chemical evolution. Supernova SN Ia plays an important role in producing the iron inventory of the galaxy. We also study the dependence of the chemical evolution on the star formation rate prevailing during the initial one billion years of the evolution of the galaxy. This era marks the formation of the galactic halo and the thick disk. A comparison of the elemental abundance distributions of the dwarf stars in the solar neighborhood is made among the various models simulated in the present work. In order to explain the majority of the observed elemental evolutionary trends, specifically those related with the galactic evolution of iron and oxygen, it would be essential to incorporate a major component of prompt SN Ia to the galactic evolution. The prompt SN Ia would produce significant fraction of SN Ia within the initial ~100 million years from the time of star formation. The essential requirement of prompt SN Ia would result in a significant enhancement of SN Ia rates during the earliest epoch of the galaxy. The elemental evolutionary trends also favor an enhancement in the star formation rate during the initial one billion years of the galaxy at least by a factor of three compared to the trend prevailing during the latter evolutionary time of the galaxy.

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