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Search Results: 1 - 10 of 371889 matches for " R. G. Jivani "
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Multi-Objective Optimization of Two-Stage Helical Gear Train Using NSGA-II
R. C. Sanghvi,A. S. Vashi,H. P. Patolia,R. G. Jivani
Journal of Optimization , 2014, DOI: 10.1155/2014/670297
Abstract: Gears not only transmit the motion and power satisfactorily but also can do so with uniform motion. The design of gears requires an iterative approach to optimize the design parameters that take care of kinematics aspects as well as strength aspects. Moreover, the choice of materials available for gears is limited. Owing to the complex combinations of the above facts, manual design of gears is complicated and time consuming. In this paper, the volume and load carrying capacity are optimized. Three different methodologies (i) MATLAB optimization toolbox, (ii) genetic algorithm (GA), and (iii) multiobjective optimization (NSGA-II) technique are used to solve the problem. In the first two methods, volume is minimized in the first step and then the load carrying capacities of both shafts are calculated. In the third method, the problem is treated as a multiobjective problem. For the optimization purpose, face width, module, and number of teeth are taken as design variables. Constraints are imposed on bending strength, surface fatigue strength, and interference. It is apparent from the comparison of results that the result obtained by NSGA-II is more superior than the results obtained by other methods in terms of both objectives. 1. Introduction Designing a new product consists of several parameters and phases, which differ according to the depth of design, input data, design strategy, procedures, and results. Mechanical design includes an optimization process in which designers always consider certain objectives such as strength, deflection, weight, wear, and corrosion depending on the requirements. However, design optimization for a complete mechanical assembly leads to a complicated objective function with a large number of design variables. So it is a better practice to apply optimization techniques for individual components or intermediate assemblies than a complete assembly. For example, in an automobile power transmission system, optimization of gearbox is computationally and mathematically simpler than the optimization of complete system. The preliminary design optimization of two-stage helical gear train has been a subject of considerable interest, since many high-performance power transmission applications require high-performance gear train. A traditional gear design involves computations based on tooth bending strength, tooth surface durability, tooth surface fatigue, interference, efficiency, and so forth. Gear design involves empirical formulas, different graphs and tables, which lead to a complicated design. Manual design is very difficult
Elastic Constants and Its Pressure Derivative of Boron Phosphide Using Higher-Order Perturbation Theory
A.R. Jivani,A.R. Jani
Journal of Nano- and Electronic Physics , 2011,
Abstract: The elastic constants, pressure derivative of bulk modulus and pressure derivative of elastic constants are investigated using the higher-order perturbation theory based on pseudopotential formalism and the application of our proposed model potential for Boron Phosphide. The parameter of the potential is derived using zero-pressure equilibrium condition. In the present study, Hartree and Sarkar et al screening functions are used to consider exchange and correlation effect. The good agreement of presently investigated numerical data is found with the available experiment data and other such theoretical values.
Hyperlipidemia Enhanced Oxidative Stress and Inflammatory Response Evoked by Renal Ischemia/Reperfusion Injury
Y.S. Bhalodia,N.R. Sheth,J.D. Vaghasiya,N.P. Jivani
International Journal of Pharmacology , 2010,
Abstract: This study was designed to investigate possible effect of hyperlipidemia on renal ischemia/ reperfusion injury in rat. Male Wistar albino rats were divided into 4 groups. Hyperlipidemia was induced by cholesterol (500 mg kg-1 p.o.) feeding in hydrogenated ground nut oil (as a vehicle) for 4 weeks. At the end of 4th week renal ischemia/reperfusion injury was perform by occlusion of both renal vascular pedicles for 60 min, followed by 24 h reperfusion. During reperfusion period, blood and urine were collected for biochemical analysis. Both kidneys were isolated, one kidney for histopathological evaluation and one for tissue parameters. The lipid peroxidation, xanthine oxidase activity and nitric oxide level in renal tissue were significantly increased after I/R in hyperlipidemic rats compared to ischemia/reperfusion in normal rats. Antioxidant enzymes like reduced glutathione, superoxide dismutase and catalase were significantly reduced after ischemia/reperfusion in hyperlipidemic rats compared to normal rats. Serums TNF-α level and myeloperoxidase activity in renal tissue, were also significantly increased after ischemia/reperfusion in hyperlipidemic rats. Furthermore, hyperlipidemic rats that underwent ischemia/reperfusion, showed severe tubular cell swelling, interstitial edema, tubular dilatation and moderate to severe necrosis. Hyperlipidemia enhanced renal ischemia/reperfusion injury by elevation of oxidative stress and inflammatory responses.
Stability-indicating HPLC determination of ciprofibrate in bulk drug and pharmaceutical dosage form
Jain P.S.,Jivani H.N.,Khatal R.N.,Surana S.J.
Chemical Industry and Chemical Engineering Quarterly , 2012, DOI: 10.2298/ciceq110824052j
Abstract: A novel stability-indicating high-performance liquid chromatographic assay method was developed and validated for quantitative determination of ciprofibrate in bulk drugs and in pharmaceutical dosage form in the presence of degradation products. An isocratic, reversed phase HPLC method was developed to separate the drug from the degradation products, using an Ace5-C18 (250×4.6 mm, 5 μm) advance chromatography column, and methanol and water (90:10 v/v) as a mobile phase. The detection was carried out at a wavelength of 232 nm. The ciprofibrate was subjected to stress conditions of hydrolysis (acid, base), oxidation, photolysis and thermal degradation. Degradation was observed for ciprofibrate in base, in acid and in 30% H2O2. The drug was found to be stable in the other stress conditions attempted. The degradation products were well resolved from the main peak. The percentage recovery of ciprofibrate was from (98.65 to 100.01%) in the pharmaceutical dosage form. The developed method was validated with respect to linearity, accuracy (recovery), precision, system suitability, specificity and robustness. The forced degradation studies prove the stability indicating power of the method.
Sharon Panth,Mahesh Jivani
Indian Journal of Computer Science and Engineering , 2013,
Abstract: Notice Board is very essential part of any organization. This paper presents the design and implementation of M-Board (Mobile Notice Board) for Ad-hoc Network Environment that can be established and made available for an educational or industry environment. The cost-free communication among the mobile phone clients and server takes place with the help of Bluetooth wireless technology. M-Board is particularly developed as an informative application environment to provide the basic information like daily events or timetable to the users. The design is based on the amalgamation of Java ME with other technologies like Java SE, Java EE, PHP and MySQL. The system is designed to provide simple, easy-to-use, cost-free solution in a ubiquitous environment. The system design is easily implemented and extensible allowing the number of clients in Personal Area Network (PAN) for information exchange with the hotspot-server.
A Comparative Study of Stemming Algorithms
Anjali Ganesh Jivani
International Journal of Computer Technology and Applications , 2011,
Abstract: Stemming is a pre-processing step in Text Mining applications as well as a very common requirement of Natural Language processing functions. In fact it is very important in most of the Information Retrieval systems. The main purpose of stemming is to reduce different grammatical forms / word forms of a word like its noun, adjective, verb, adverb etc. to its root form. We can say that the goal of stemming is to reduce inflectional forms and sometimes derivationally related forms of a word to a common base form. In this paper we have discussed different methods of stemming and their comparisons in terms of usage, advantages as well as limitations. The basic difference between stemming and lemmatization is also discussed
Lipid peroxidation and renal injury in renal ischemia/reperfusion: Effect of Benincasa cerifera
Bhalodia Y,Vaghasiya J,Malaviya S,Jivani N
International Journal of Green Pharmacy , 2009,
Abstract: To investigate the role of the methanolic fruit extract of Benincasa cerifera on lipid peroxidation (LPO) and renal pathology in ischemia/reperfusion (I/R).In experimental methodology, both renal pedicles were occluded for 60 min followed by 24 h of reperfusion. B. cerifera (500 mg/kg/day) was administered orally for 5 days prior to induction of renal ischemia and was continued for 1 day after ischemia. At the end of the reperfusion period, rats were sacrificed. Sham-operated rats followed same procedure except renal arteries occlusion. LPO and histopathological analysis were done in renal tissue. Serum creatinine and urea levels were measured for the evaluation of renal function. In ischemia/reperfusion (I/R) rats, malondialdehyde (MDA) levels were increased significantly when compared with sham-control rats. Histological changes showed tubular cell swelling, interstitial oedema, tubular dilation and moderate-to-severe necrosis in epithelium of I/R rat as compared to sham control. The methanolic fruit extract of B. cerifera could attenuate the heightened MDA levels. I/R-induced renal injury was markedly diminished by administration of B. cerifera These results indicate that the methanolic fruit extract of B. cerifera attenuate renal damage after I/R injury of the kidney by potent antioxidant or free radical scavenging activity.
Exaggerated liver injury induced by renal ischemia reperfusion in diabetes: Effect of exenatide
Vaghasiya Jitendra,Sheth Navin,Bhalodia Yagnik,Jivani Nurudin
Saudi Journal of Gastroenterology , 2010,
Abstract: Background/Aim: This study was designed to investigate the possible effect of exenatide (Glucagon like Peptide-1 receptor agonist) on liver injury (distant organ) induced by renal ischemia reperfusion (IR) in diabetic rats. Materials and Methods: In vivo renal IR was performed in both type 2 diabetic and normal rats. Each protocol comprised ischemia for 30 minutes followed by reperfusion for 24 hours and a treatment period of 14 days before induction of ischemia. Results: Lipid peroxidation, xanthine oxidase activity, myeloperoxidase activity and nitric oxide level in liver tissue were significantly increased (P < 0.01, P < 0.001, P < 0.001, P < 0.05, respectively), after IR in diabetic rats compared to normal rats. Antioxidant enzymes like glutathione, superoxide dismutase, catalase and glutathione peroxidase were significantly reduced (P < 0.05, P < 0.05, P < 0.01, P < 0.05, respectively), after IR in diabetic rats compared to normal rats. Exenatide treatment significantly normalized (P < 0.01), these biochemical parameters in treated rats compared to diabetic IR rats. Serum creatinine phosphokinase activity and liver function enzymes were also significantly normalized (P < 0.001, P < 0.001, respectively), after administration of exenatide. Conclusion: Exenatide exerted protective effect on exaggerated remote organ (liver) injury induced by renal IR in diabetes.
Design, Development and Testing of an Air Damper to Control the Resonant Response of a SDOF Quarter-Car Suspension System  [PDF]
R. G. Todkar
Modern Mechanical Engineering (MME) , 2011, DOI: 10.4236/mme.2011.12011
Abstract: An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.
Synthesis and Characterisation of Silver Nanoparticles in Different Medium  [PDF]
G. Alagumuthu, R. Kirubha
Open Journal of Synthesis Theory and Applications (OJSTA) , 2012, DOI: 10.4236/ojsta.2012.12003
Abstract: Silver nanoparticles were synthesized in different alcoholic medium such as ethylene glycol and n-butyl alcohol by solvothermal method. The nanoparticles have been successfully synthesized by reducing silver nitrate with the above solvents in the presence of trioctyl phosphine oxide (TOPO) as the capping agent at room temperature for 1 h. Electron microscopy, X-ray diffraction, and absorption spectra have been used to investigate the products, and the mechanism is proposed to interpret the controlled synthesis of the products. The results indicate that this approach provides a versatile route to prepare silver nanowires and nanoparticles with controllable diameters. The formation of nano products by this method is rapid, simple and stable.
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