X-ray Diffraction Analysis of Severely Cold Deformed Hypereutectoid Steel Wire

Hypereutectoid steel wire rod of diameter 6.40 mm is lead patented in lead bath of an electric powered furnace and then it is cold drawn through converging conical dies in a die sequence up to 2.50 mm diameter. The drawn wires subjected to different true strain are analysed using line profile X-ray diffraction methods. The classical Williamson-Hall plot as well as modified Williamson-Hall plot of drawn wire specimens of different true strain is plotted. The theoretical as well as experimental value of q is evaluated. The q is a parameter which depends up on elastic constant of the crystal and type of dislocations. The changes in nature of dislocations from edge dislocations to screw dislocations are calculated against true strain and are verified by scanned electron microscopy’s micrograph of drawn wire

A Review- Mri Segmentation Techniques

In this paper author is trying to review, different methodologies available for MRI segmentation. Here various methodologies are discussed in great detail; moreover this paper will also try to give an elaborate scenario of all the methodologies presented in few popular researches. Few methods discussed here are diffusion weighted and diffusion tensor MRI to white matter diseases, atlas based segmentation, automatic segmentation methods, short axis cardiac images segmentation. Author is trying to discuss all different methodologies mention. The sole objective of this paper is to carry a systematic review of the available literature and to assess the various automatic segmentation techniques. &nbsp

A Survey Of Techniques And Design For Microstrip Patch Antenna

In today's growing world, Microstrip also known as patch antennas are becoming more useful as they can be printed openly onto a circuit board. The Microstrip antennas are also very useful within the mobile phone market. Patch antennas are low profile, low cost and are easily fabricated. In telecommunication, there are several types of microstrip antennas and the frequently used is the patch antenna or microstrip patch antenna. Microstrip antennas are relatively economical to design and assemble because of feature like simple 2-dimensional physical geometry. They are usually employed at UHF and higher frequencies because the size of the antenna is directly tied to the wavelength at the resonant frequency. A single patch antenna has ability to provide maximum directive gain of around 6-9dBi. It is relatively easy to print an array of patches. Patch arrays can gives greater gains at little additional cost; matching and phase adjustment is possible to perform with printed microstrip feed structures, again in the same operations that form the radiating patches. The patch antenna has is able to create high gain arrays in a low-profile which make it applicable on airplanes as well as in other military applications

Multi-objective optimization of quality characteristics in single point incremental forming process by response surface methodology

254-264Single point incremental forming (SPIF) process has demonstrated its capability for sheet metal prototyping and low volume production applications. However, it is not widely used in industries due to poor surface quality and non-uniform thickness distribution of the parts formed by this process. In the present work, a systematic approach has been proposed for modeling and optimizing the surface roughness and minimum thinning to improve the surface finish and uniform thickness profile. With the use of response surface methodology along with Box–Behnken design, the quantitative effects of four parameters (step depth, spindle speed, tool diameter, and wall angle) have been analyzed on surface roughness and minimum thinning. On the basis of response surface methodology and analysis of variance, the optimal results have been predicted. A major interaction has been adequately and proficiently identified to produce minimum surface roughness and uniformly formed thickness profile

Optimization of gas protected stir casting process using GRA and TOPSIS

437-446In this paper, multi-response optimization of gas protected stir casting process parameters is carried out for the development of Al2024/red mud composite in order to maximize the responses such as tensile strength and microhardness. Process parameters considered are reinforcement, grain size and blade angle which are varied at three levels and Taguchi’s L27 orthogonal array is used for designing the experiments. Optimum condition of the process parameters are established for the multi-response optimization problem using TOPSIS and grey relational analysis (GRA). Response surface methodology (RSM) is used to derive the regression equations for the responses which are found to be effective within the design space. ANOVA analysis is carried out to study the effect of process parameters on the responses and it is observed that reinforcement is having a dominating effect on both the responses followed by grain size and blade angle. Results of GRA and TOPSIS are found to be in good agreement with each other