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Search Results: 1 - 10 of 423233 matches for " K. S. Umesh "
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Development of a Speckle Interferometer and the Measurement of Fried's Parameter (r$_o$) at the Telescope Site
S. K. Saha,G. Sudheendra,A. Umesh Chandra,V. Chinnappan
Physics , 1999,
Abstract: A new optical speckle interferometer for use at the 2.34 meter Vainu Bappu Telescope (VBT), at Vainu Bappu Observatory (VBO), Kavalur, India, has been designed and developed. Provisions have been made for observation both at the prime focus (f/3.25), as well as at the Cassegrain focus (f/13) of the said telescope. The technical details of this sensitive instrument and the design features are described. An interface between the telescope and the afore-mentioned interferometer is made based on a concept of eliminating the formation of eddies due to the hot air entrapment. The performances of this instrument has been tested both at the laboratory, as well as at the Cassegrain end of the telescope. It is being used routinely to observe the speckle-grams of close-binary (separation $<$1 arc second) stars. The size of the Fried's parameter, r$_{o}$, is also measured.
Studies on Mechanical Properties and Tribological Characteristics of LM25-Graphite-Silicon Carbide and LM25-Flyash-Silicon Carbide-Hybrid MMC’s
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: Hybrid MMC’s have various advantages over conventional metals. Aluminum has a wide advantage in research field which is used as base metal in many MMC’s. Aluminum LM25 is used as base metal in this work. The studies were done using graphite and flyash by varying the percentage of Silicon Carbide and aluminum LM25 as base metal. Graphite and flyash are added for 2 % of aluminium weight seperately and Silicon carbide is varied for 2, 4, 6 and 8% weight of aluminium. The low density of Aluminum and hardness of Silicon carbide and graphite, and affinity of Flyash in Aluminum was to be evaluated as a hybrid structure. The mechanical properties such as tensile strength, Hardness and wear rate were increased after alloying with Graphite and Silicon carbide up to certain percentage. The primary advantage of the hybrid composite is the low density that is obtained after alloying.AlSiCFA is a lightweight material with a density one third of that of Cu alloys. The 2% SiC and 2% Graphite is the best combination of reinforcements that could be integrated in aluminum for best results. The hardness of the material increases with the combination of 2% addition of SiC and Graphite. The Silicon Carbide and Fly ash addition increases the tensile strength, hardness and wear resistance, but only up to a particular composition. The 2% SiC and 2% Fly ash is the best combination of reinforcements that could be integrated in aluminum for best results. The highest wear rate was measured in 8% SiC. Here the hardness of the alloy makes it unable to bear the wear. The AlSiCG and AlSiCFA hybrid composite materials preparation was cost effective and provides high performance related properties after testing for their mechanical behavior. The MMC’s were tested for the evaluationof composite materials ability to replace existing advantages of aluminium LM25. Also to evaluate the hybrid reinforcement property of composites for their better useage.
Microwave Synthesis, Characterization and Photocatalytic Properties of SnO2 Nanoparticles  [PDF]
Ashok K. Singh, Umesh T. Nakate
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.21012

In the present endeavour, SnO2 nanoparticles (NPs) were synthesized using microwave method. Synthesized SnO2 NPs were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrscopy (EDS) to find their structure, morphology and elemental composition. SnO2 NPs were of spherical morphology having crystallite size of 35.42 nm as obtained from Scherrer’s formula using most intense peak of XRD. Synthesized NPs were used for photodegradation of melthylene blue (MB) dye under UV light. The SnO2 NPs ware found to have photodegradation efficiency and apparent rate constant of 55.97% and 2.149 × 10_2 respectively.

Aldose Reductase Inhibition Prevents Metaplasia of Airway Epithelial Cells
Umesh C. S. Yadav,Leopoldo Aguilera-Aguirre,Kota V. Ramana,Istvan Boldogh,Satish K. Srivastava
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0014440
Abstract: Goblet cell metaplasia that causes mucus hypersecretion and obstruction in the airway lumen could be life threatening in asthma and chronic obstructive pulmonary disease patients. Inflammatory cytokines such as IL-13 mediate the transformation of airway ciliary epithelial cells to mucin-secreting goblet cells in acute as well as chronic airway inflammatory diseases. However, no effective and specific pharmacologic treatment is currently available. Here, we investigated the mechanisms by which aldose reductase (AR) regulates the mucus cell metaplasia in vitro and in vivo.
A Survey on Recent Trends, Process and Development in Data Masking for Testing
Ravikumar G K,Manjunath T N,Ravindra S Hegadi,Umesh I M
International Journal of Computer Science Issues , 2011,
Abstract: In today's information age, the data is an important asset of the organization so the security of the data is a vital role in the industry. In order to achieve the above aspect, the data masking is used. The data masking is mainly the data is replaced with realistic but not the original data. The main objective is to make sensitive information is not made available outside of the environment. The data masking is to just provide the copy of the production data in support of the development environment and thus it controls the leakage of the data. Data masking are designed to be repeatable so referential integrity is maintained. We have explored the data masking architecture, techniques with realistic data and order of masking. We hope this paper will help quality analyst in pulling data from production environments into test environment for quality analysis by safe guarding the original information.
Design and Analysis of DWH and BI in Education Domain
Manjunath T N,Ravindra S Hegadi,Umesh I M,Ravikumar G K
International Journal of Computer Science Issues , 2011,
Abstract: Data warehouse acting as a decision support systems, Data warehouses standardize the data across the organization so that there will be one view of information. Data warehouses can provide the information required by the decision makers. Developing a data warehouse for educational institute is the less focused area as educational institutes are non-profit and service oriented organizations. In present day scenario where education has been privatized and cut throat competition is prevailing, institutes needs to be more organized and need to take better decisions. Educational institute's enrollments are increasing as a result of increase in the number of branches and intake. Today, any reputed Institute's enrollments count in to thousands. The management challenges include meeting diverse student needs, increased complexity in academic processes. The complexity of these challenges requires continual improvements in operational strategies based on accurate, timely and consistent information. The cost of building a data warehouse is expensive for any educational institution as it requires data warehouse tools for building data warehouse and extracting data using data mining tools from data warehouse. The present study provides an option to build data warehouse and extract useful information using data warehousing and data mining open source tools.
Paranasal Sinus Neuroendocrine Carcinoma: A Case Report and Review of the Literature
Nagesh T. Sirsath,K. Govind Babu,Umesh Das,C. S. Premlatha
Case Reports in Oncological Medicine , 2013, DOI: 10.1155/2013/728479
Experimental Investigation on Usage of Palm Oil as a Lubricant to Substitute Mineral Oil in CI Engines
K. S. V. Krishna Reddy,Naval Kabra,Umesh Kunchum,T. Vijayakumar
Chinese Journal of Engineering , 2014, DOI: 10.1155/2014/643521
Abstract: Due to growing environmental concerns, vegetable oils are finding their way into lubricants for industrial and transportation applications. The substitution of mineral oil with vegetable oil as a base stock for an environment friendly lubricant in a CI engine is explored in this study without adding any additives. The experiments have been conducted with a mixture of palm oil and mineral oil, at different compositions. Blends of palm oil and mineral oil in different compositions, 0, 25, and 50 (by vol %) were added to base SAE20W40 mineral oil to obtain different lubricant blends. The parameters evaluated include brake thermal efficiency, brake specific fuel consumption, volumetric efficiency, and mechanical efficiency and exhaust emissions. The engine performance and emission tests were carried out on a single cylinder, water cooled, 4-stroke CI engine. Compared to mineral oil, the palm oil-based lubricant revealed appreciable expedience on engine and emission performance. 1. Introduction Vegetable oil lubricants provide a renewable source of environmentally friendly lubricants, relating to the lubricant’s ability to biodegrade into harmless products. Recently there has been an increased concern in enhancing the use of biodegradable vegetable oils in lubricants, mostly by environmental as well as health and safety issues, emerging due to changes in economic and supply factors. From the viewpoint of emissions, biodegradable lubricants are expected to behave differently from conventional lubricants, mainly with respect to SOF emissions (soluble organic fraction of particulate emissions). Polycyclic aromatic hydrocarbons, which are absent in vegetable oils, pose a great contingency to human health. Vegetable oils are also low in potential pollutants like sulphur-containing compounds which can damage both environment and catalytic converter. The advantages of vegetable oils as base oil in lubricants as compared to mineral oils are nontoxicity, biodegradability, resource renewability, affordable application cost, high viscosity index, and so forth. Vegetable oils are usually much cheaper than ester based oils and therefore provide more potential for the successful implementation as lubricants in base oil. 1.1. Literature Review Many researchers have worked on these methods, with positive results. Cheenkachorn and Fungtammasan [1] investigated the use of palm oil as base oil for an environmentally friendly lubricant for small four-stroke motorcycle engines. Their study showed that, compared to mineral-based commercial oil, the palm oil-based lubricant showed
Paranasal Sinus Neuroendocrine Carcinoma: A Case Report and Review of the Literature
Nagesh T. Sirsath,K. Govind Babu,Umesh Das,C. S. Premlatha
Case Reports in Oncological Medicine , 2013, DOI: 10.1155/2013/728479
Abstract: Neuroendocrine neoplasms are defined as epithelial neoplasms with predominant neuroendocrine differentiation. They can arise in almost every organ of the body although they are most commonly found in the gastrointestinal tract and respiratory system. Nasal cavity and paranasal sinuses are a rare site for neuroendocrine carcinoma. In contrast to the other regions, neuroendocrine tumours of the sinuses have been reported to be recurrent and locally destructive. Very few cases of paranasal sinus neuroendocrine carcinoma have been reported till date. Difficulty in pathologic diagnosis and rarity of this malignancy have hindered the progress in understanding the clinical course and improving outcomes. We herein report a case of poorly differentiated neuroendocrine tumour of ethmoid and sphenoid sinus with invasion of orbit and intracranial extension. The patient had complete response at the end of chemoradiation and he was disease-free for 9 months duration after which he developed bone metastasis without regional recurrence. 1. Introduction In the nasal and paranasal sinus regions, squamous cell carcinoma is the most common tumor, followed by adenocarcinoma, malignant lymphoma, sinonasal undifferentiated carcinoma, malignant melanoma, and olfactory neuroblastoma [1]. Primary sinonasal neuroendocrine carcinomas are rare and represent a histological spectrum of differentiation. Neuroendocrine neoplasms are classified into well-differentiated (typical carcinoid), moderately differentiated (atypical carcinoids), and poorly differentiated (small and nonsmall cell types). Well-differentiated and, to a lesser extent, moderately differentiated neuroendocrine carcinomas carry better prognosis. Small-cell neuroendocrine carcinoma (SNEC), that is, poorly differentiated neuroendocrine carcinoma, was first described in the 19th century in the context of lung cancer. Head and neck SNEC have been described only since 1965 [2]. Poorly differentiated sinonasal neuroendocrine carcinoma is an extremely rare and aggressive neoplasm with a high recurrence rate and a tendency to metastasize to other sites via the lymphatic system and blood stream [3]. Because of the rarity of sinonasal neuroendocrine carcinoma, no agreement for adequate management has been reached among oncologists. The purpose of this paper is to analyse available information regarding this uncommon malignancy. The epidemiology, clinical features, pathological findings, differential diagnosis, and evolution of treatment of this rare neoplasm will be discussed. The paper presents recent treatment trends that may
Modified Newton's rings: II
T. Sai Chaitanya,Rajiv kumar,V. Sai Krishna,B Shankar Anandh,K. S. Umesh
Physics , 2010,
Abstract: In an earlier work (Shankar kumar Jha, A Vyas, O S K S Sastri, Rajkumar Jain & K S Umesh, 'Determination of wavelength of laser light using Modified Newton's rings setup', Physics Education, vol. 22, no.3, 195-202(2005)) reported by our group, a version of Newton's rings experiment called Modified Newton's rings was proposed. The present work is an extension of this work. Here, a general formula for wavelength has been derived, applicable for a plane of observation at any distance. A relation between the focal length and the radius curvature is also derived for a plano-convex lens which is essentially used as a concave mirror. Tracker, a video analysis software, freely downloadable from the net, is employed to analyze the fringes captured using a CCD camera. Two beams which give rise to interference fringes in conventional Newton's rings and in the present setup are clearly distinguished.
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