bluuebunny/crossref_metadata_2025_split huggingface dataset:
FE approach for dynamic response of a functionally graded spinning shaft system containing a transverse fully open crack
Authors: Gayen D , Chakraborty D , Tiwari R 
Published: December 2019

Abstract
Free vibration and stability analysis are studied for a rotor-disc-bearing system having a radially functionally graded (FG) shaft with a transversely fully open crack, based on finite element (FE) approach. Both internal viscous and hysteretic damping are incorporated in the FE model of FG cracked shaft using two nodded Timoshenko beam element having four degrees of freedom at each node. Material properties of the FG shaft are assumed temperature dependent and graded with different material law of gradation. Aluminium Oxide (Al2O3) and stainless steel (SS) are composed as FG material. Local flexibility coefficients (LFCs) are derived analytically as a function of crack size, power-law gradient index and temperature using Paris’s equation and Castigliano’s theorem to compute the stiffness matrix at each instant in the FE analysis. Using the developed MATLAB code, the FE formulation and the cracked model are verified with the published results. Parametric studies are conducted to study the influences of different material gradient index, temperature gradient, crack size, internal damping, slenderness ratio and boundary conditions on the vibration responses of the FG cracked shaft system.
A phenomenological model for the viscoelastic behaviour of natural rubber
Authors: Kumar Deepak , Lateefi Md Moonim , Sarangi Somnath 
Published: December 2019

Abstract
The present work is concerned with the study of the viscoelastic behaviour of natural rubber in relaxation tests. A phenomenological model is presented to predict the exact viscoelastic behaviour of natural rubber in a finite strain regime to enhance the experimental fit accuracy. A rate dependent multiplicative deformation gradient tensor is splitted into elastic and viscous parts during deformation. Viscoelastic behaviour of natural rubber is introduced through Jeffrey rheological model with Horgan and Sacoomandy type energy function. A thermodynamically consistent rate-dependent relaxation time scheme is introduced which results reduced material parameters, complexity level and the computational time. The developed constitutive model is validated with stress relaxation test data that depicts the rate-dependent viscoelastic behaviour of natural rubber.
Optimization of cutting parameters and prediction of surface roughness during hard turning of H13 steel with minimal vegetable oil based cutting fluid application using response surface methodology
Authors: Raj Anil , Leo Dev Wins K. , Varadarajan A. S. 
Published: December 2019

Abstract
The manufacturing industries in modern era are competing to reduce cost of production by employing innovative techniques, one being hard turning. In hard turning process, the work piece is heat treated to the required hardness in the initial stage itself and near net shape is arrived directly by hard turning process. Hard turning reduces manufacturing lead time by excluding the normal cost incurring processes such as, turning, heat treatment, finish grinding etc. In this experimental investigation hard turning process is assisted with minimal cutting fluid application technique, which reduces cutting fluid usage to a minimum of 6-8 ml/min. Soya bean oil based emulsion was used to make the hard turning environment friendly. The oil was prepared by adding additives, which will enhance the desirable properties of the oil for hard turning. Response surface methodology was used for optimization of cutting parameters and for the prediction of surface roughness. A central composite design was implemented to estimate the second-degree polynomial model. The cutting parameters considered for experimentation were cutting speed, feed rate and depth of cut. The surface roughness was considered parameter for prediction. Surface roughness predicted by the response Surface Methodology matched well with the experimental results.
Experimental study and characterization of coal gasification in a circulating fluidized bed gasifier
Authors: Dwivedi Krishna Kant , Pramanick A K , Karmakar M K , Chatterjee P K 
Published: December 2019

Abstract
In this study Indian coal material were used for the experiments and presents the results from gasification of Indian sub-bituminous coal in a (4.0 m tall X 0.75 m diameter) circulating fluidized bed gasifier. All the experiments were performed at the temperature range 700-800 °C. A number of experiments were carried out to see the effect of different parameters like coal feed rate, coal particle size on the quality of syngas production during the gasification of coal in circulating fluidized bed gasifier. All the above parametric study performed on three different superficial velocities of 5, 6 and 7 m/s. During the experiments coal feed rate was in the range of 0.036-0.073 g/s and coal particle size was varied from 80-212 mm respectively. With this experiment it is found that with increasing the superficial velocity, the solid circulation rate of material increases as well as with increases in solid inventory. It is observed that coal particle size also affect the heat transfer coefficient means it is decreases with increase the size of coal particle.
Solar distillation using heat pipes and heat exchanger
Authors: Vijayasarathy B , Kumar Dinesh , Vijayakrishnan K , Kumar Ajith , Kotebavi Vinod 
Published: December 2019

Abstract
This project focuses on obtaining distilled water using solar power. A non conventional design was given to the solar distillation by eliminating the basin and replacing it with a small tank with lid which has an outlet for evaporated steam. The arrangement consists of a tank of volume of 7.4 litres which is filled with water which is heated with the help of heat pipe placed inside evacuated tubes. The complete arrangement was made and experiment was conducted at Amrita school of engineering, Bangalore (Latitude: 12.97°N and Longitude: 77.59°E). The performance study was conducted i) Without compound parabolic concentrator ii) With compound parabolic concentrator. The maximum distilled water output obtained was of 560 ml without the use of compound parabolic concentrator with overall efficiency of 23.31%. The output was found to be increased to 680 ml with the use of compound parabolic concentrator which gave an overall efficiency of 27.23%. The hardness of the distilled water was 19ppm which was obtained by distilling brackish water of 390ppm.
Simulation and Comparative performance analysis of Modified Cyclone Dust Separator
Authors: Bhade Suveg , Hegde Sriharsha 
Published: December 2019

Abstract
The cyclone separator is industrial equipment that is in use for a long time. Because of its industrial importance, a lot of extensive research work has been done. This paper discusses the efficiency of cyclones by considering the pressure loss and collection efficiency (cutoff diameter). The simulation of fluid-dust flow field in a cyclone is carried out using computational studies. The gas flow rate and temperature and geometrical parameters governing the efficiency of cyclone are the focus of this study. In this paper, the influence of the geometry on flow field pattern and performance of the tangential inlet cyclone separators are analyzed using computational work. The current work is carried out in three steps. First phase is dedicated to study the Stairmand’s optimized design to appreciate the pressure and speed fluctuations. This study if followed by examining the cyclone separator by varying the inlet width and height; and the cyclone total height. Finally, mathematical study to determine the efficiency of the dust separator is done.
Heat Transfer Augmentation in Solar Air Heater using Trapezoidal Winglets
Authors: Akash Nawin A R , George Ajin P , Sanjeev J R V , Kotebavi Vinod 
Published: December 2019

Abstract
In this paper we will investigate about the thermal effectiveness of a solar air heater which consists of trapezoidal type vortex generators by experimentation and validating with numerical simulation. The trapezoidal type vortex generator is placed inside the duct having a test section of 400*300*30mm. Trapezoidal vortex generators are placed in 3 different arrangements inside the duct, and having an array of 5 winglets in each row. The vortex generator is categorized as a winglet and the height of the winglet is half the height of the air duct. The analysis of trapezoidal winglet is done for wide range of Reynolds Number ranging from 3500 to 25000. Thermal performance factor is calculated by Webb’s correlation factor equation for roughness of surface, which considers Nussult Number and friction Factor as a parameter for thermal effectiveness. Numerical simulation was carried out using Ansys Fluent Software. Comparison of experimental and numerical results was done. Experimental and Numerical results showed that an increase in heat transfer rate of upto 65% was obtained when compared to smooth channel duct.
An Experimental Investigation of Fracture Toughness and Volume Resistivity of Symmetric Laminated Epoxy/Glass Fiber/CNT multiscale composites
Authors: Lakshmanan Mahadevan , Jayanarayanan Karingamanna , Joesph Joyal 
Published: December 2019

Abstract
In this work an attempt is made to improve the fracture toughness and electrical conductivity of epoxy/glass fiber based laminates by the inclusion of carbon nanotube (CNT) fillers. The fiber orientation of the epoxy/glass fiber (GF) fabric laminates was optimized based on estimation of mechanical properties. The carboxylic acid functionalized CNTs were incorporated into epoxy matrix by ultra-sonication method. The nano filled epoxy resin was used to prepare laminates with 30/45 GF fabric orientation. The CNT content was varied and its effect on the tensile properties was determined. The fracture toughness of multiphase composites was estimated using single edge notch bend (SENB) test. The presence of CNTs improved the fracture toughness by a crack bridging mechanism. The volume resistivity of multiphase composites was found to be superior to the conventional epoxy/CNT composite. The presence of glass fabric reduces the number of inter-tube contacts contributing to the reduction in volume resistivity.
Synthesis, characterization of Cr-Gd nanocomposites doped with yttrium possessing dielectric properties
Authors: Adimule Vinayak , Bhowmik Debdas , Suryavanshi Anusha 
Published: December 2019

Abstract
We report here, a set of perovskite oxide nanomaterials that has been prepared through co precipitation methods. Synthesis of nanocomposite material, chromium-gadolinium doped with various concentrations of yttrium was investigated for their dielectric properties. Nanocompositional hybrid materials were prepared by co precipitation method with composition of Cr0.3 Gd0.3 (Y2O3) x moles. In the present study yttrium is doped with x = 0.1-0.5 moles, the gelated precipitate of hybrid nanomaterials were calcinated at different temperatures and characterized by XRD, FT-IR, UV-Vis, SEM spectroscopic techniques. The doped Y2O3 to chromium and gadolinium multi component nanocomposite with different concentrations (0.1-0.5%). The dielectric constants of the pelletalized samples were examined at 300K and 320K temperature and materials showed variable dielectric polarization with respect to temperature and frequency. The precursor material used for the synthesis is chromium sulphate and gadolinium carbonate which are reduced in presence of triethanol amine (TEA).The aqueous mixture of greenish brown precipitate was filtered, washed with ethanol-water mixture (1:9 volume %) to remove any impurities present with the precipitate, dried at 50-100°C, heat treated at 650-750 °C and obtained pure nanocomposite.
Findings:
Spectroscopic studies showed that Y2O3 grain size was 12-60 nm in diameter and it’s over layer is 85% optically transparent. XRD pattern demonstrated the formation of hexagonal yttrium and dopant addition moderately affect the crystal structure. Higher dielectric constants were obtained with larger grain size of the nanocomposites.
Optimization of Process Parameters That Affects Hole Quality Characteristics in Drilling Of Syntactic Foams Using Artificial Neural Network Model and Particle Swarm Optimization
Authors: Lakkundi Anand , Gaitonde Vinayak. N. , Karnik S. R. , Deshpande Anand. S. 
Published: December 2019

Abstract
The drilling is known popular and common mechanical operation which is performed frequently during manufacturing of automotive and aerospace related parts, it is important to study the manufacturability of any novel engineering materials developed and subjected for machining more often as drilling a hole which is required for the purpose of assembly. In this regard the proposed work aims at study of drilling process parameters on newly developed class of polymer based composites. Cenosphere or fly ash acts as a filler material which is a by-product of coal combustion used along with epoxy to produce syntactic foam. The preparation of cenosphere based epoxy composites is done using hand layup technique. The controllable factors in the presented study identified such as cutting speed, feed rate and drill diameter are suspected to have effect on drilled hole quality characters, such as surface roughness and delamination factor. Syntactic foams of 40% by weight are fabricated. A complete factorial design has been selected to perform drilling experiments and recommended drilling quality aspects are analyzed using RSM based quadratic relationships. The relationship of RSM revealed that Ra and Fd are varying non-linearly for selected input variables. The optimization of selected parameters is performed and it is seen that Ra of 0.2 microns and Fd 0.99 are achieved at cutting speed of 55m/min, feed rate of 0.05mm/rev and using drilling tool of diameter 16mm.
Realization of vertically aligned 1-D Ferrous nanorods using template assisted electrochemical deposition
Authors: Anu Roshini R , Kannan E S 
Published: December 2019

Abstract
In this work, we report on the synthesis of vertically aligned ferrous (Fe) nanorods using aluminium oxide template (AAO). Initially, a thick layer of gold was deposited on one side of the anodic aluminium oxide template to realize a good electrically conductive surface. The other side of the AAO is subjected to pore widening technique using phosphoric acid before electrochemically depositing Fe inside the pores. After deposition, the template was removed and the resulting free-standing Fe nanorods were found to have grown along the 110 plane. We controlled the dimensions of the Fe nanorods by varying parameters such as the concentration of electrolyte solution and the rate of electrodeposition. This growth technique is advantageous since there is uniformity in the sizes of nanorods and the free-standing nanorods provides an ideal platform for making Fe nanorod based memories.
Integrating FMEA, QFD and Lean for Risk management in hospitals
Authors: Harikumar Priya , Saleeshya P G 
Published: December 2019

Abstract
The purpose of this paper is to help hospital administrative managers or decision makers understand and effectively mitigate the hospital wide risks by developing and implementing strategies, before they turn detrimental to the firm. This paper done as a case study deals with risk identification, measurement, assessment, mitigation and control of risks present in hospitals. We have applied FMEA and Quality function deployment (QFD) methods for risk quantification and assessment. Using these techniques critical risk agents which create risk events in the hospital were identified. Mitigation plans were developed based on expert opinions. We analysed the integration of lean thinking principles in the risk control process and found that the risk control by implementating lean techniques has a scope for productivity improvement and better customer satisfaction in hospitals.
Microstructural and Mechanical behaviour of Nickel Aluminum Bronze alloys
Authors: Kuppahalli Prabhakar , Keshavamurthy R. , Sriram P. , Kavya J.T 
Published: December 2019

Abstract
The present investigation reports on microstructure and mechanical characterization of permanent and shell moulded Nickel Aluminum Bronze alloy Castings (NAB) (AB2) melted in Medium Frequency coreless Induction furnace. The mechanical properties studied consisted of Tensile strength, Yield Strength, ductility on one hand, Optical microscopy and grain size measurements on the other. Effect of zirconium addition on the microstructure and mechanical characteristics of Permanent and shell moulded castings have been studied. The results of this investigation reveal that microstructures consisted of dispersed particles in the matrix of copper solid solution both in permanent and shell moulded castings. Shell moulded castings exhibited extensive grain refinement compared to Permanent moulded castings. Very high values of Tensile Strength, Yield strength and Elongation values are obtained for the Nickel Aluminum Bronze alloys. Shell moulded castings have exhibited superior mechanical properties than Permanent moulded castings in all the characteristic/property values obtained.
Performance analysis of solar air dryer for drying different spices
Authors: Sharma Darshana , Rajesh VR 
Published: December 2019

Abstract
The present work is confined to the fabrication of a solar dryer for drying spices and evaluates the performance of the collector and dryer system. The materials for each component of the dryer system is chosen considering different parameters effecting the performance of the dryer which includes design, operational, meteorological and environmental parameters. The experiments were carried out for 1 kg of two different types of spices and the drying efficiency is estimated to be 3.81 % for red chilly and 2.04 % for turmeric. The collector temperature is varying between 58ºC to 90ºC and the drying chamber temperature is varying between 46ºC to 60ºC during the entire observation period for an ambient temperature of 36ºC to 41ºC. The collector efficiency is varied from 28% to 45 %. The variation in moisture content and drying rate over the drying period are analysed and presented.
Rotational dynamics of Bacillus subtilis in an optical trap
Authors: Bhat Ashwini V , Parthasarathi Praveen , Iyengar Shruthi S , Yendeti Balaji , Mohana D C , Vudayagiri Ashok , Ananthamurthy Sharath 
Published: December 2019

Abstract
The swimming of a bacterium in fluids occurs in a low Reynolds number regime. The ability to confine the swimming motion by trapping a bacterium in laser light, can give information on the propulsion coefficients, which are important in explaining the efficiency of swimming of these bacteria. In this work, we report the results of an optically trapped Bacillus subtilis in an optical tweezer and the studies on the rotatory motion of the bacterium. The data is gathered and analysed using video microscopy. The propulsion coefficients of such swimming bacterium are determined through a power spectral analysis of the rotatory motion of the bacterium in the trap.
Development of Polymer Microneedle upon Exposure of Hollow Gaussian Beam on Unconstraint Depth Resin
Authors: Londhe B U , Bhole K S , Sharma C , Bhole D K 
Published: December 2019

Abstract
This paper presents characterization of unconstraint depth photopolymerization yielding different forms of cured voxel under exposure of hollow Gaussian beam. The governing model consists of nonlinear Schrodinger equation along with transient diffusion phenomenon and intensity dependent refractive gradient is considered in predicting the curing behaviour. The effect of various process parameters viz; intensity of and degree of hollowness of Gaussian beam, time of exposure on the formation of cured voxel is presented in this paper. Typical of cured voxel resembles hollow microneedle under certain conditions of exposure. The study proposes potential possibility to be used as one of the methods to develop hollow microneedle being used in many biomedical applications for effective drug delivery.
Impedance Spectroscopy of Pb0.8La0.2Fe0.1Cr0.1Ti0.8O3
Authors: Nayak Amrita , Patri S K , Behera B , Deepti P L 
Published: December 2019

Abstract
In this paper, we have focused on the structural and electrical properties of Pb0.8La0.2Fe0.1Cr0.1Ti0.8O3 ceramic through complex impedance spectroscopy method. It was synthesized by the conventional solid-state reaction technique. Detailed analysis of complex impedance and modulus plot was done, which proposed the semiconducting nature (NTCR) of the sample. Temperature dependant relaxation processes are going on inside the material, which is of non-Debye type.
Investigating Sedimentation and Rheological properties of Magnetorheological Fluids using various carrier fluids
Authors: Aruna M N , Rahman M.R. , Joladarashi Sharnappa , Kumara Hemantha 
Published: December 2019

Abstract
The present paper focuses on the preparation of Magnetorheological (MR) fluids samples with three types of carrier fluids are silicone, light paraffin and Poly-alpha-olefin (5, 30 and 400 cSt) viscosity oils with 25% volume fraction of carbonyl iron particles and 3% fumed silica as a thixotropic agent to improve sedimentation of the MR fluid. The morphology, magnetic saturation and phase of the carbonyl iron particles were investigated using field emission scanning electron microscopy (FESEM), super quantum interface interference device (SQUID), X-ray diffraction (XRD) respectively. The results found that obtained powder particles spherical in shape, and a high magnetic saturation of 270 (emu/gm) with the applied field of 15000 (Oe). The prepared MR fluids rheological properties were tested using Anton Paar MCR702 Twin drive rheometer fitted with a magneto-rheological module. Sedimentation stability examined using direct observation method.
Synthesis, Characterization and antibacterial activity of Magnesium Oxide (MgO) nanoparticles.
Authors: Almontasser A , Parveen A , Azam A 
Published: December 2019

Abstract
Magnesium nitrate hexahydrate Mg (NO3)2.6H2O, ammonia and distilled water were used for preparation magnesium oxide (MgO) via a precipitation method, where magnesium nitrate is used as a precursor, distilled water as a solvent and ammonia is used to maintain pH of the sample. The MgO was characterized by an X-ray diffractometer microscopy and a UV-Vis spectroscopy. In this study, The average particle size has been investigated by XRD spectroscopy, which came out to be 7 nm by using Scherrer’s equation. The samples had good crystallinity with a preferred orientation in the (222) direction. The energy band gap was estimated using UV-Vis spectroscopy, which is equal to be 4.8eV. As well as, in the present paper, the main goal for preparation Magnesium oxide is to study the antibacterial activity of magnesium oxide. Antibacterial was testing by analyzing the diameter of inhibition zone appeared in disk diffusion tests and minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of samples dispersed in media. The results of bacterial sensitivity of nanoparticles vary depending on the type of bacteria E. coli and S. aureus, hence revealed the efficacy of magnesium oxide nanoparticles.
Investigating the morphology and thermophysical properties of Al2O3 and CuO nanofluids
Authors: Singh Vinay , Gupta Munish , Kumar Ajay 
Published: December 2019

Abstract
Presently researches on nanofluids are high due to the owing interest and increasing day to day demand. The aim of the present investigation is to examine the size and morphology of nanoparticles using SEM and HRTEM and also calculate the thermophysical properties of alumina/water and CuO/water nanofluids. Nanofluids with weight concentration of 0.02 wt% and 0.05wt% were made using distilled water by adding appropriate amount of nanoparticle and base fluid. Thermophysical properties were measured at different temperatures using different concentration of nanofluids. Addition of nanoparticles in base fluid improves the thermal conductivity at increasing concentrations with temperature rise however, viscosity decreases with temperature increase.