Form Accuracy Analysis of Cylindrical Parts Produced by Rapid Prototyping

Solid Freeform fabrication processes are being considered for creating fit and assembly nature functional parts. It is extremely important that these parts are within allowable dimensional and geometric tolerance. The part accuracy produced by rapid prototyping process is greatly affected by the relative orientation of build and face normal directions. A systematic method is needed to find the reliability of the created product. This paper discusses the work done in this area and the effect of build orientation on the part form accuracy analysis of each specified tolerance like circularity and cylindricity. Feasible build direction that can be used to satisfy those tolerances is identified. It will help process engineer in selecting a build direction that can satisfy a mathematical model of form tolerance.Mechanical Engineerin

Multi Objective Optimisation of Build Orientation for Rapid Prototyping with Fused Deposition Modeling (FDM)

The ability to select the optimal orientation of build up is one of the critical factors since it affects the part surface quality, accuracy, build time and part cost. Various factors to be considered in optimisation of build orientation for FDM are build material, support material, build up time, surface roughness and total cost. Experiments were carried out and results are analysed for varying build orientation for primitive geometries like cylinder. An appropriate weighting factor has been considered for various objective functions depending on the specific requirement of the part while carrying out multi-objective optimisation. These analyses will help process engineers to decide proper build orientation.Mechanical Engineerin

ECOLOGICAL CONSCIOUSNESS IN THE SELECTED POEMS OF INDIAN AND WESTERN POETS

Ecocriticism is the new branch of literature which deals with environment and literature in different perspectives. The true lovers of nature critically evaluate and exemplify the environmental issues. It is a kind of new platform to explore and protect the environment through writings. Actually, ecocritical movement started in the USA in late 19th century and slowly spread across the world. The writers of English also took part for the protection of nature by exposing the repercussions from deforestation through their precious writings. Indian poets such as Gieve Patel, Dilip Chitre and Nikhil Sharma and western poets such as Adrian Flett, Charlotte Mew and George Woodcock are part of this phase. All of these poets have taken a great care and concern towards the environment and expressed their feelings over the tendency of humans with regard to deforestation. Their poems are highly motivational and realization to the people not to damage or destroy the vegetation on this planet and it’s an advice to stop the future pandemics also. Hence, ecological balance has become the recurrent issue of the present time in the entire universe. The present research article aims at analyzing critically about destroying the vegetation is equal to killing a huma

Form Accuracy Analysis of Cylindrical Parts Produced by Rapid Prototyping

Solid Freeform fabrication processes are being considered for creating fit and assembly nature functional parts. It is extremely important that these parts are within allowable dimensional and geometric tolerance. The part accuracy produced by rapid prototyping process is greatly affected by the relative orientation of build and face normal directions. A systematic method is needed to find the reliability of the created product. This paper discusses the work done in this area and the effect of build orientation on the part form accuracy analysis of each specified tolerance like circularity and cylindricity. Feasible build direction that can be used to satisfy those tolerances is identified. It will help process engineer in selecting a build direction that can satisfy a mathematical model of form tolerance.Mechanical Engineerin

Effect of Crumb Rubber Particle Size and Content on the Low Temperature Rheological Properties of Binders

This paper presents a study to evaluate low temperature rheological properties of crumb rubber modified binders and the impact of the particle size and content on such properties. Three sizes of the crumb rubber (0.18, 0.425 and 2.0 mm), a control (0%) and two levels of crumb rubber content (12% and 24%) were used with four asphalt binders. The measured rheological properties consisted of creep stiffness (St) and logarithmic creep rate (m). Results showed that: increasing the crumb rubber content decreased the creep stiffness which improves thermal cracking resistance. The impact of crumb rubber content on the m-value was very highly inconsistent. The crumb rubber size did not have significant effect on the low temperature properties. The effect of the size of the crumb rubber on the resistance to thermal cracking was dependent on the asphalt binder source. The analysis of the data generated in this experiment showed that some combinations of crumb rubber size and content can either improve or jeopardize the PG low temperature ofthe asphalt binder

Carrier dynamics in GaAs/AlAs quantum wire arrays

635-641Measurements of ps time resolved luminescence spectra, performed on a GaAS/AlAs quantum wire array are reported. The array is excited by picosecond laser pulses at different densities, from 0.05×nM to 2×nM are, where ×nM is the Mott density in 1-D (= 8×105 cm-1).</span