Sardar Beant Singh State University (S.B.S.S.U.), Gurdaspur, earlier known as Beant College of Engineering and Technology, is a university located in Gurdaspur, Punjab, India. S.B.S.S.U. imparts education in various Science and Engineering disciplines. S.B.S.S.U. has seven academic and two administrative departments.
Herein, a biomimetic coating of hydroxyapatite (HA)–Al2O3 and HA–ZrO2 was deposited on Ti–6Al–4V-alloy using vacuum plasma spray (VPS) technique. The bond-coat of ZrO2 has been introduced between the substrate and reinforced HA coatings to study the effect of bond-coat on structural, mechanical properties and electrochemical corrosion performance of the developed coatings. In addition, the impact of thermal treatment of coating was investigated on these properties too. Coating characteristics, such as morphology, porosity, surface roughness, and crystallinity were investigated. The corrosion performance of coatings was tested in Hank’s-based salt solution (HBSS). Significant enhancement in crystallinity and surface-hardness has been witnessed after heat treatment; nevertheless, porosity reduced. The electrochemical corrosion study revealed that the corrosion resistance of heat-treated samples was better than the as-sprayed coatings samples. The intensity of XRD peaks of all coatings increased after 24[Formula: see text]h immersion in HBSS for the electrochemical test in comparison to the intensity of peaks before the corrosion test.
The field of data mining is gaining wide popularity these days due to its enormous applications. Earlier, sequential pattern mining was performed based on support or frequency as a threshold. Then, it was extended to include time information and later the concept of utility mining emerged. Researchers have worked on hybridization using any two constraints such as time, frequency, or utility. This work aims to provide a novel hybrid pattern growth based approach for the discovery of sequential patterns along with time intervals and satisfying both frequency and utility as a threshold. A support–utility table is also introduced for maintaining information of support and utility at various time intervals. The hybridization of constraints increases the usefulness of patterns. Experimental results also showed that the proposed work gives good results as compared to the existing hybrid algorithms.
In the current study, wear performance of pure magnesium (Mg) and composite fabricated with titanium carbide (TiC) reinforcement is investigated under various loading and sliding velocity conditions. The Mg-matrix composite is prepared by friction stir processing (FSP) carried out at optimized values of process parameters. Sliding wear tests on Mg and friction stir processed (FSPed) Mg+TiC surface composite were done on pin-on-disc configuration. The consequence of the normal load applied and sliding velocity on wear behaviour of the two materials is evaluated by performing the tests at two normal loads of 6 N and 12 N and three sliding speeds of 0.5 m/s, 1.5 m/s and 4.5 m/s. FSPed composite found to exhibit an enhanced wear resistance as compared to that of pure Mg. To get an insight into the possible types of mechanisms for wear of the composites sample under varying load and sliding speeds conditions, the worn test specimens are subjected to scanning electron microscopy (SEM). SEM/EDS analysis revealed that oxidation, ploughing, trailing edge and 3-body abrasive wear were the predominant mechanisms for the wear of samples at a different set of experimental conditions. The tensile strength of the FSPed surface composite was found to be 25% higher than pure Mg. Wear resistance was found to increase by about 33%.
La0.7Sr0.3Fe0.1Mn0.9O3 and La0.7Sr0.3Fe0.4Mn0.6O3 perovskite were prepared via solid state reaction method for cathode application in solid oxide fuel cell. XRD analysis confirmed single phase and crystalline nature of the both compounds. Density was calculated by Archimedes Principle and surface morphologies were investigated via Scanning Electron Microscope. Thermal behavior of the compounds was studied by thermo gravimetric analysis and dilatometer. Above 350 0C temperature, material started gaining weight and increased content of Fe decreased its thermal expansion coefficient. Impedance spectroscope confirmed the non-Debye relaxation behaviour. Fe substitution enhanced the dielectric constant as well as conductivity and decreased the activation energy of the material. Maximum value of conductivity was found to be 116.31 S/cm for La0.7Sr0.3Fe0.4Mn0.6O3 compound. Investigated parameters recommended that as prepared materials are suitable materials for cathode of SOFCs.
La0.70Ca0.30MnO3 system has been prepared by solid state reaction method for cathode of solid oxide fuel cell applications. The structural studies have been investigated by X-Ray diffraction method and the experimental results have confirmed that the prepared system has been well crystallized into single phase, crystal structure is orthorhombic and size of the particle has been calculated to be 0.35 μm. The surface morphology has been studied by scanning electron microscopy which confirmed that grain sizes are irregular, non uniform and randomly oriented. Archimedes principle has been used to investigate the density of the prepared material. Thermal properties of the system confirmed its stability at high temperature and thermal expansion coefficient well matched with other cell components. The dielectric as well as impedance properties have been investigated at different ranges of temperature and frequency. Electrical conductivity of the prepared system has been found to be more than 100 S/cm as well as obtained value of activation energy signifies that the synthesized system is suitable for cathode of solid oxide fuel cell applications.
