Materials Science

The significant number of pedestrian injuries in the world and fatal deaths are resulting from road accidents and an event of a collision between the people and car, that due to the increased urban population and number of private vehicles. This paper deals with the development of a new finite element model to simulate the collision between the adult headform impactor and vehicle hood composite structure according to the EURO-NACP requirements. The pedestrian head impacted by three points over the outer structure of the hood with three different inclination angles. The effects of the inclination angles (6?, 8? and 10?) and impact points (A, B and C) over the surface of the composite hood structure to HIC value, displacement and absorbed energy have been investigated, and the results have been compared with each other.

Aluminium-Silicon alloy based metal matrix composites have been recognized as an appropriate wear resistant material particularly for sliding wear applications. An attempt has been made in the present paper to highlight the performance of Al-Si-TiB2 composites with variation in Silicon content and presence of TiB2 synthesised by means of salt metal reaction during stir casting method. The dry sliding wear behaviour of these composites was studied using a pin-on-disc wear testing machine varying load (10, 20, 30N) with a sliding velocity of 1m.s-1 for a sliding distance of 1800m. The microstructures of the specimens were analyzed by Scanning Electron Microscope as well as with optical microscope and also tested for hardness using Vickers hardness tester. Wear resistance and hardness values found to increase with increased wt% of Si.

Magnesium oxide (MgO) nanoparticles were synthesized through chemical coprecipitation followed by thermal treatment. Structural, optical and luminescence properties along with dielectric properties were studied and relaxation mechanisms were explored. The structural characterization studies confirmed the formation of nano sized MgO particles with hierarchical structures and high purity. The dielectric properties were studied in different frequency range at different temperatures. In addition, the Cole –Cole plot are used to explore the relaxation mechanism prevalent in nanostructured MgO. In dielectric materials there are multiple dipole relaxation mechanisms which give rises to spreading of relaxation time on the average relaxation time.

Activated carbons (AC) prepared from rice husk by KOH activation in inert atmosphere at 750 and 850 0C were modified with nitric acid. Activation at 850 0C resulted in better pore development and was confirmed by SEM, Boehm titration and BET. The modification by nitric acid could reduce the particle size while enhance the amount of hydroxyl and carbonyl groups on the surface of AC samples. Bath adsorption of benzene, toluene and m-xylene (BTX) as well as dynamic adsorption of m-xylene were measured in order to evaluate the performance of AC for removing volatile organic compounds (VOCs). The results showed that AC sample prepared at 850 oC (RH-850) exhibited the best benzene adsorption capacity of 11.62 mmol g-1 in bath adsorption and m-xylene adsorption capacity of 9.140 mmol g-1 in dynamic adsorption at 50 0C.

Medieval archaeological bridges located in the region of Adjara (Georgia) have been studied. It is shown that the mineralogic-petrographic composition of the fog is almost uniform. The carbonate part of the mortar equals is 20-25%, and the aluminosilicate part reaches 70-80%. The exception is the bridge of Varjanauli, where the carbonate part is more than 40%. It is recommended to use a high quality cigar to keep the brushes in the rehabilitation and restoration of bridges.

In our project we have chosen coconut coir as the major reinforcement. and banana fiber as an additional fiber, to improve the mechanical property of polymer composite with vinyl ester as the base material, prepared by hand layup process according to ASTM standards the test specimens are prepared with different weight fractions of coconut coir and banana fiber. tests were conducted and the improvement in mechanical properties (tensile strength and flexural strength) of the hybrid composite material is observed

Enterprise informatization is a procedure in which IT is applied into the field of enterprise production, technology, and management, to improve the cost-effectiveness of exploration of informational resources and obtain financial profits. Enterprise informatization consists of three main aspects, the automation and flexibility of production, the integrative management and the systemic organization. The capacity of enterprise informatization is a resources-based capability, which has technical, manageable and organizational properties; it is divided into the three categories, which include information technology capability, information organizing capability and information innovation capability. Enterprise informatization capability can improve business performances, in this study we do the research on informatization capability how to increase enterprise’s competitive advantages in synergy, integration of customer relationship management, e-supply chain management, as well as global opportunities.

Graphene oxide (GO) is an amazing nanostructured material with a wide range of possible technological applications, including its use as filler for thermoplastic polymers or thermosetting resins. A combination of graphene-related substances with other systems often leads to promising nanocomposite materials with unique mechanical, chemical, and physical properties. In this work, we study morphology and elastic properties of a composite consisting of polystyrene (PS) and graphene oxide (GO). We prepared several composite films of this nature with a varying polystyrene concentration on a fixed amount of graphene oxide. The morphology of the composites was observed by Scanning Electron Microscopy (SEM). The SEM image shows the higher the concentration in polystyrene, the more compact structure of graphene oxide and polystyrene are observed. The mechanical properties of the composite films were analyzed using Atomic Force Microscopy (AFM). It is found that the Young’s elastic modulus of the composite film changes drastically from the value of its pure constituent solutions though it shows a rather weak dependence on the polystyrene concentration for the values considered.

LiMn2O4 has been explored as a cathode material for Li-ion batteries. The usual method to produce LiMn2O4 has been the solid state reaction process. We report the synthesis of spinel phase lithium manganese oxide (LiMn2O4) nanoparticles through a template-free starch-glycine assisted solution combustion synthesis (SCS). The method is a single step method. The resultant powder was characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) techniques, which were studied in details to observe the structural and electrochemical properties.

Aluminium-3%Magnesium-10% silicon carbide composite is prepared in an induction heating furnace. The physical characteristics of both as-casted sample and corroded samples have been studied. A slice of the composite sample is kept in sea water for 6 weeks (42 days) and the weight loss was measured with the help of an electronic weighing machine in every 7 days to study the corrosion behavior.