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Search Results: 1 - 10 of 14042 matches for " Singh Onkar "
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STUDY OF BIODIESEL AS A FUEL FOR CI ENGINES AND ITS ENVIRONMENTAL EFFECTS: A RESEARCH REVIEW
Mukesh Kumar,Onkar Singh
International Journal of Advances in Engineering and Technology , 2013,
Abstract: Biodiesel will play an increasing role in fulfilling the world’s energy requirement. The world has experienced negative effect from the fossil fuel such as global warming and acid rain etc. With the increase in consumption of biodiesel, its impact on environment has raised a discussion around the world. Energy requirement of the world will increase in coming future and is projected to increase by 50% from 2005 to 2030. The paper presents the results of biodiesel combustion emission on the environment. A review of literature available in the field of vegetable oil usage has identified many advantages. Vegetable oil is produced domestically which helps to reduce costly petroleum imports, it is biodegradable, nontoxic, contains low aromatics and sulphur and hence, is environment friendly. The biodiesel shows no obvious NOx emission difference from the pure diesel fuel at low and medium engine loads. Biodiesel blend ratios have little effect on the NO/NOx ratio at medium and high engine loads. The CO emission of biodiesel increases at low engine loads. The HC emissions show a continuous reduction with increasing biodiesel blend ratios. There is a good correlation between smoke reduction and the ratio of the biodiesel blends. The addition of biodiesel fuel increases formaldehyde emission. A series of engine tests, with and without preheating have been conducted using each of the above fuel blends for comparative performance evaluation. The results of the experiment in each case were compared with baseline data of diesel fuel. Significant improvements have been observed in the performance parameters of the engine as well as exhaust emissions, when lower blends of karanja oil were used with preheating and also without preheating. Karanja oil blends with diesel (up to K50) without preheating as well as with preheating, can replace diesel for operating the CI engines.
Giant adrenal cortical carcinoma
Singh Onkar,Gupta Shilpi
Saudi Journal of Kidney Diseases and Transplantation , 2011,
Abstract:
Carcinoma colon presenting as cutaneous metastasis to an old operative scar of hysterectomy
Gupta Shilpi,Singh Onkar
Journal of Cancer Research and Therapeutics , 2010,
Abstract: Cutaneous metastases from asymptomatic colonic carcinoma have been documented rarely in the literature. But cutaneous metastasis to an already present operative scar as the mode of presentation of otherwise asymptomatic colon cancer is an extremely rare phenomenon which has been described only thrice till now. We report such a case of adenocarcinoma of sigmoid colon which presented as a large subcutaneous metastasis to an already existing scar of hysterectomy.
A Study of Performance Output of a Multivane Air Engine Applying Optimal Injection and Vane Angles
Bharat Raj Singh,Onkar Singh
International Journal of Rotating Machinery , 2012, DOI: 10.1155/2012/578745
Abstract: This paper presents a new concept of the air engine using compressed air as the potential power source for motorbikes, in place of an internal combustion engine. The motorbike is proposed to be equipped with an air engine, which transforms the energy of the compressed air into mechanical motion energy. A mathematical model is presented here, and performance evaluation is carried out on an air-powered novel air turbine engine. The maximum power output is obtained as 3.977?kW (5.50?HP) at the different rotor to casing diameter ratios, optimal injection angle 60°, vane angle 45° for linear expansion (i.e., at minimum air consumption) when the casing diameter is kept 100?mm, at injection pressure 6 bar (90?psi) and speed of rotation 2500?rpm. A prototype air engine is built and tested in the laboratory. The experimental results are also seen much closer to the analytical values, and the performance efficiencies are recorded around 70% to 95% at the speed of rotation 2500–3000?rpm. 1. Introduction As per recent survey in the populationwise largest state of Uttar Pradesh, India, there are more than 10.5 millions transport vehicles out of which about 8.2 millions are two wheelers/motorbikes, mostly driven by internal combustion (IC) engines. The total transport vehicles are generating about 77.8% air pollutants such as: carbon monoxide (CO), carbon dioxide (CO2), and unburned hydrocarbon (HC), out of which 80% pollutants is generated by motorbikes and released to the atmosphere. The study shows that the IC engines of motorbikes may generate up to two times more pollutants than those of automobiles. In order to reduce the air pollution and eliminate 50–60% of the emitted pollutants, this paper presents a new concept of an air engine using compressed air as the potential power source for motorbikes instead of an IC engine. Such motorbike is proposed to be equipped with an air engine, which transforms the energy of the compressed air into mechanical motion energy. The number of transport vehicles is increasing across the world every year and resulting into rapid and huge consumption of fossil-fuel quantities, thereby causing a threat to fast depletion to energy resources. A noted geophysicist Marion King Hubbert [1] was the first man who effectively applied the principles of geology, physics, and mathematics in 1956 for the future projection of oil production from the US reserve base. Hubbert indicated that conventional crude-oil production would attain peak oil in 1970 and thereafter start depleting. This may cause a serious threat to mankind within 40 years,
Critical Effect of Rotor Vanes with Different Injection Angles on Performance of a Vaned Type Novel Air Turbine
Bharat Raj Singh,,Onkar Singh
International Journal of Engineering and Technology , 2010,
Abstract: Globally faster consumption of hydrocarbon fuel in the transport sector is posing threat to environmental and ecological imbalances and thereby depletion of hydro-carbon fuel is causing another challenge to oil reserves. In view of these issues extensive researches are being carried out to explore the alternative energy source and or to find out appropriate energy conversion system. The atmospheric air once compressed, it is found as potential working fluid to produce shaft work for an air turbine and releases almost zero pollution in the environment. This paper details the athematical modeling of a small capacity compressed air driven novel multi-vanes type air turbine. Effect of expansion of high pressure air collected between two consecutive vanes at different vane angles and varying inlet pressure have been analyzed here. The study shows that the total shaft power is found optimum at injection angle 60o when vane angle θ=36o (10 vanes) and it reduces at injection angle 45o when vane angle θ=51.4o (7 vanes) and further goes down at injection angle 30o when vane angle θ=60o-72o (6-5 vanes), for injection pressure 6 bar and speed of rotation 2500 rpm.
Effect of Different Vane Angles on Rotor- Casing Diameter Ratios to Optimize the Shaft Output of A Vaned Type Novel Air Turbine
Bharat Raj Singh,,Onkar Singh
International Journal of Engineering Science and Technology , 2010,
Abstract: This paper deals with new concept of compressed air energy storage system using atmospheric air at ambient temperature as a zero pollution power source for running motorbikes. The proposed motorbike is equipped with an air turbine in place of an internal combustion engine, and transforms the energy of the compressed air into shaft work. The mathematical modeling and performance evaluation of such small capacity compressed air driven vaned type novel air turbine is presented here. The effect of isobaric admission and adiabatic expansion of high pressure air for different rotor to casing diameter ratios with respect to different vane angles (number of vanes) have been considered and analyzed. It is found that the shaft work output is optimum for some typical values of rotor to casing diameter ratios at a particular vane angle (i.e. no. of vanes). In this study, when casing diameter is considered 100 mm, and rotor to casing diameter ratios are kept 0.70 to 0.55, the average maximum power is obtained to the order of 4.95 kW (6.6 HP) which is sufficient to run motorbikes.
Study of Effect of Injection Angles to Rotor-Casing Diameter Ratios on Performance of a Vaned Type Novel Air Turbine
Bharat Raj Singh,Onkar Singh
International Journal of Engineering Science and Technology , 2010,
Abstract: This paper describes the performance evaluation of a small capacity compressed air driven vaned type novel air turbine which is suitable for use as prime-mover to run motorcycles. A mathematical model is presented here for studying the influence of rotor / casing dimensions with respect to different injection angles. The effect of expansion and steady fluid flow action of high pressure air have been considered and analyzed here. The results show that shaft work output of such novel air turbine is optimum for some typical values of rotor / casing diameter ratios at a particular injection angle and themaximum power is obtained as 3.6 kW, 4.3 kW, 4.9 kW, 5.5 kW and 6.0 kW for the particular rotor / casing diameter ratios of 0.75, 0.70, 0.65, 0.60 and 0.55 respectively when injection pressure is kept 6 bar, speed of rotation 2500 rpm, nos. of vanes 8 and casing diameter 100 mm.
Urethral Foreign Body Causing Urethral Fistula
Onkar Singh,Shilpi Singh Gupta
Urology Journal , 2012,
Abstract: No Abstract
Analysis of the Effect of Rotor-to-Casing Diameter Ratio on the Power Output of a Vaned-Type Air Turbine-II
Bharat Raj Singh,Onkar Singh
Research Journal of Applied Sciences, Engineering and Technology , 2011,
Abstract: This study describes new results of the performance evaluations of an air powered vane type rotary novel air turbine/engine. The mathematical model with different parametric values such as; different rotor to casing diameter (d/D) ratios at optimum vane angle of 45o and injection angle of 45o, have been considered and analyzed. The optimum power output is obtained at some typical values of rotor/casing diameter ratios without consumptions of excessive air. The study shows that the optimum power developed under such conditions would be 4.3-5.5 kW (5.84-7.47 HP) at linear expansion (without excessive air consumption) when d/D ratios are between 0.85 to 0.80 and casing diameter is kept 150 mm, injection pressure as 6 bar (90 psi) and speed of rotation as 2500 rpm. This power output is enough to drive any motorbike or light vehicle.
Effect of Helix Pitch Angle on the Modal Dispersion Characteristic of Step-Index Optical Fiber  [PDF]
Ashish Kumar Mishra, Deepak Kumar, Onkar Nanth Singh
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.47038
Abstract: The general characteristic equation is derived for the helically cladded step-index optical fiber. The dispersion curves are drawn for the different pitch angles Ψ and mode order ν = 1. The effect of helix pitch angle on the dispersion characteristics and also on the modal cut-off condition is examined. Except for the lowest order mode, all the modes appear in pairs. The lowest order mode displays the negative dispersion for the some value of normalized frequency V and depends on the helix pitch angle Ψ.
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