Authors - P. Meenakshi , Dr Vidhya Abstract : Crystal growth is the development of prior crystal increases as more particles or ions include their situations in the crystal lattice and formed into a crystal and further development is handled. Melt growth is the procedure of crystallization by combination and re-solidification of the unadulterated material. It is the most generally connected technique, particularly for the development of not very high softening point substances. Development from the melt by solidification is the most generally utilized strategy for the readiness of enormous single crystals. In existing strategy utilized the Czochralski technique for the decay of the YbNi4P2 and temperature is over 1500 OC surrounding weight required. To lessen the dimension of the temperature here proposed the YbNi4P2 Bridgman Stockbarger single crystal method. The technique includes warming, polycrystalline material in a compartment over its softening point. This development is improved physical properties of their compound. The trial results are played out the electrical-transport measure with -heading and decided RR1:8k=9 and shows best crystal result from the Bridgman development tests.
Authors - S. Sankaran, S. Sudhakar Abstract : In recent years, as a type of hybrid system, the concrete-filled steel tubular (CFST) columns are increasingly used in buildings and bridges. In concrete-filled steel tube (CFST) columns, the steel tube provides formwork for the concrete, the concrete prolongs local buckling of the steel tube wall, the tube prohibits excessive concrete spalling and composite columns add significant stiffness to a frame compared to more traditional steel frame construction. The design of concrete filled steel tubes is considered to be difficult since a proper formula is not present to find out the axial load carrying capacity of such CFST short columns. The main aim is to find an approximate formula for finding the ultimate axial load carrying of rectangular concrete filled steel tube short column by obtaining relations between various material properties of CFST using a finite element model developed using ANSYS software and validating it against the experimental data obtained during literature survey.
Keywords : Concrete Filled Steel Tubes, Contact Elements, Contact Status, Finite Element Model, Short Column, Ultimate Axial Load
Authors - A. Ranganathan, T. Kavitha Abstract : The alkali activation of waste materials like fly ash has become an important area of research because it is possible to use these materials to synthesize inexpensive and ecologically sound cement like construction materials. In this paper, the mechanism of activation of a fly ash with highly alkaline solution is described. These solution made with NaOH and Na2SiO3 having the common characteristics of having a very high OH- concentration. Owing to their high strength and predominantly amorphous microstructure the materials on the basis of latent hydraulic active substances activated by alkalis like fly ash and therefore, they are included into the group of so-called “chemically bonded products”. The new eco friendly concrete being formed during the polymerisation of fly ashes exhibit their amorphous character with minority crystalline phases.
Authors - S. Prabhakar, S. Sundar, S. Suresh Abstract : Quick sealing valves with double isolation characteristics are the new facet in the valve industry finding its application in a wide range of process industries for flow isolation & control. Quick sealing valves manufactured by Larsen and Toubro are serving in different locations across the country from the year 2012. Being a new variant in the valve family and in its early stages of growth, Quick sealing valves carry a great scope for value enhancement in terms of both technical advancement and cost competitiveness. This project aimed at reducing the cost of the Quick sealing valve by 10% by applying value engineering principles at the same time without compromising on any technical requirements demanded by the codes & standards. Quick sealing valves are constructed by majority of casted components which are machined and processed hence major contribution to the cost is the cost of the cast components & cost of machining and other special surface treatment process. So by applying value engineering principles the weight of the as cast components which directly contribute to the cost was minimized and unwanted machining process and special surface treatment processes were eliminated. With the changes implemented, the valves were tested and proved satisfactory as per the standard requirements. A total cost saving of 11.2% achieved based on the implemented recommendations.
Keywords : Quick Sealing Valves, Value Analysis, Value Engineering, Cost Reduction