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  • 1
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    Analysis of ion conduction and relaxation in Na 2 NbCdP 3 O 12 glass (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-02-18
    Description: The ac conductivity of ionic conducting Na 2 NbCdP 3 O 12 is studied over the frequency range of 100Hz to 1MHz at different temperatures. The conduction mechanism of the material is studied using the concept of mismatch and relaxation (CMR) model and the length scale of the ion transport process is studied from the many particle displacement function for various temperature. The non-Debye relaxation mechanism and ionic conduction is analysed through the anomalous relaxation function and it is compared with CMR.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
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    Growth, optical, electrical and photoconductivity studies of a novel nonlinear optical single crystal: Mercury cadmium chloride thiocyanate (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: SCN − ligand based organometallic non-linear optical mercury cadmium chloride thiocyanate (MCCTC) crystals are grown from water plus methanol mixed solvent by slow evaporation technique. The grown crystals are confirmed by single crystal X-ray diffraction analysis which reveals that the MCCTC belongs to rhombohedral system with R3c space group. MCCTC exhibits a SHG efficiency which is nearly 17 times more than that of KDP. The dielectric constant, dielectric loss measurements of the sample have been carried out for different frequencies (100 Hz to 5 MHz) and, temperatures (308 to 388 K) and the results are discussed. Photoconductivity study confirms that the title compound possesses negative photoconducting nature. The surface morphology of MCCTC was also investigated
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Development of 3D Printed Brain Tumour for Surgical Biopsy (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: The traditional treatment for brain cancer includes surgery, radiotherapy and chemotherapy. The neurosurgeon usually plans and performs the surgery with the help of two dimensional MRI images. If the size and the exact location of tumour is not clear it is difficult to perform a safe surgery and sometimes may cause permanent damage to the normal tissues. Such problems could be minimized by having first hand information regarding the tumour and hence an attempt is made in the present research to create 3D printed models of brain tumours using a medical image processing software based on MRI datasets. The MRI data saved as DICOM (Digital Imaging and Communications in Medicine) would be integrated with 3D slicer. 3D printer produces a physical 3D models using STL file generated from 3D slicer. Thus the 3D printed model of Brain Tumour could be served as a tool for preoperative surgical planning.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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    Experimental Analysis of Erosive Behavior on Al-SiC P BasedMMC Using Micro Particle (Al 2 O 3 ) as Erodent (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-12-20
    Description: The Effectiveness of the erosion process mainly depends on different properties of the erodent as well as the process parameters. The process parameters such as the impingement angle, Eroded velocity and erodent size have the significant effect on the productivity of the erosion mechanism. To investigate properly on aluminium-based metal matrix composite the erodent chosen was micro Al 2 O 3 . A Taguchi based design of experiment was conducted and the effect of the response parameters such as the erosion rate and Signal to Noise ratio (S/N ratio) were studied. It was observed that erosive behaviour of the surface and the mechanisms of material removal mainly depend on the shape and size of the crater formed by the erodent particles which are subjected to variation in shape, velocity & impact angle. Therefore, SEM Analysis was done to find out the surface characteristics and also developed mathematical model for output responses was examined by Analysis of v...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
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    Modeling and multi-objective optimization of WEDM of spark plasma sintered boron carbide considering preferences of users (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-15
    Description: In this research work, development of a multi-response optimization technique was performed, using Genetic Algorithm (GA) optimization technique in wire electrical discharge machining (WEDM) keeping in mind about the priorities of multiple users. Boron carbide has been selected as work piece for experiment. The effect of five process parameters such as pulse on time (T on ), pulse off time (T off ), peak current (IP), water pressure (WP), servo feed (SF), were investigated on the responses such as machining speed and surface roughness (R a ) in WEDM operation. Further, two responses were modeled empirically through regression analysis. The developed models can be used by the machinists to predict the machining as well as the surface characteristics over a wide range of machining input parameters. The analysis of variance (ANOVA) is also applied to investigate the effect of influential input parameters. Finally, the confirmation experiments were conduct...
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  • 6
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    Statistical Analysis of 30 Years Rainfall Data: A Case Study (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-08-10
    Description: Rainfall is a prime input for various engineering design such as hydraulic structures, bridges and culverts, canals, storm water sewer and road drainage system. The detailed statistical analysis of each region is essential to estimate the relevant input value for design and analysis of engineering structures and also for crop planning. A rain gauge station located closely in Trichy district is selected for statistical analysis where agriculture is the prime occupation. The daily rainfall data for a period of 30 years is used to understand normal rainfall, deficit rainfall, Excess rainfall and Seasonal rainfall of the selected circle headquarters. Further various plotting position formulae available is used to evaluate return period of monthly, seasonally and annual rainfall. This analysis will provide useful information for water resources planner, farmers and urban engineers to assess the availability of water and create the storage accordingly. The mean, standard deviation and...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 7
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    Effects of Nano Additives in engine emission Characteristics using Blends of Lemon Balm oil with Diesel (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-06-03
    Description: Economic growth in developing countries has led to enormous increase in energy demand. In India the energy demand is increasing at a rate of 6.5% every year. The crude oil demand of country is meet by bring in of about 70%. Thus the energy safety measures have become key issue for our country. Bio diesel an eco-friendly and renewable fuel alternate for diesel has been getting the consideration of researcher’s entire world. The main aim of this paper is to evaluate the engine parameters using blend of pure lemon balm oil with diesel. Also nano Additives is used as a catalyst with blends of bio fuel to enhance the Emission Characteristics of various effective gases like CO2, NOx, CO and UHC with various levels of engine process parameters.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Effect of carbonization temperatures on biochar formation of bamboo leaves (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-04-11
    Description: Bamboo is a typical plant native in Asia, been used in many sectors, which also produces a large volume of leaves which goes waste and not find its application for any useful purposes; is often considered as a bio-waste and normally incinerated or dumped; as its applications are not yet fully explored. However, some research work done on bamboo fibers for use as a reinforcement in making polymer matrix composite. In the present piece of research work, the influence of burning/carbonization of bamboo leaves (at different temperatures) have been studied and characterized. Proximate analysis gave the fixed carbon content (of ~nearly21%). X-Ray diffraction results revealed the presence of various phases viz. cristobalite (SiO 2 ), Calcite (Ca 2 O 3 ) etc. accompanied with changes in crystal structures. Fourier transform infrared spectroscopy results showed various modes of vibrations viz. O-H stretching bending of other bonds; (for aromatic benzene derivat...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
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    Development and performance evaluation of high speed cryogenic turboexpanders at BARC, India (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-12-30
    Description: Turboexpanders are a key focus area for Bhabha Atomic Research Centre (BARC), Mumbai, India in the program for development of helium refrigerators and liquefiers for intra departmental requirements. To start with, a turbine impeller with major diameter 16 mm and design speed of 264,000 RPM, suited for use in the 1st stage of a modified Claude cycle/reverse Brayton cycle based standard helium liquefier/refrigerator, is developed. Later on, a second series of turboexpander with the same major diameter (16 mm) and design speed of 260,000 RPM is developed with “splitter” blades at the major diameter end. Yet another turboexpander series, size 16.5 mm and design speed 168,000 RPM, is also developed suited for use in the 2nd stage of a standard helium liquefier/refrigerator. The present article describes these turboexpander development efforts at BARC, including results obtained during field trials with the BARC helium refrigerator and liquefier.
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
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    Machining of Ti-6Al-4V ELI Alloy: A brief review (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-07-31
    Description: Ti-6Al-4V ELI has similar properties as of Ti-6Al-4V (Grade 5) except it has higher ductility as well as improved fracture toughness. It has the ability to withstand high temperature without losing properties, highly corrosion endurance and high strength to weight ratio. So it’s widely applicable in biomedical implants, aerospace industry, military application, automobile component and high pressure cryogenic vessels. During the machining of the titanium alloys, a lot of machining difficulty occurs due to its hardness, chemical reaction take place between tool and machine workpiece, high amount of heat generated at cutting zone. Cutting speed and cutting feed are predominant factors for cutting tool wear as well as the finished quality of the surface. Mainly flank wear (adhesion), notch wear and crater wear (diffusion) are identified during the machining. Cutting temperature indirectly influenced the surface quality of machined surface and tool wear. The high cutting speed with ...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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