Advanced Materials and Processes Research Institute
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Studies on cold upsetting behaviour of AA2014-based metal\ud matrix composites, FEM simulation, and comparison\ud with experimental results.
Full text linkCold upsetting experiments under unlubricated conditions were carried out on as cast and homogenized AA2014/SiC/10p composite billets having dispersoids in size range of 20–40 lm. The study was aimed to evaluate the effect of homogenization on their deformation behaviour. Optical and scanning electron micrographic examination of the samples was also undertaken. Hardness measurements were carried out to observe changes, if any, before and after the forging. Ring compression tests were also carried out to determine the coefficient of friction between the platens and the work piece, which is a necessary requirement to carry out simulation studies. FEM simulation analysis of the forging of composite cylinders was then undertaken using MSC-Marc software with a specified diameter-to-height ratio. Detailed comparisons of the experimental variables with the finite element method (FEM) results were carried out to ascertain the accuracy with which the deformation process can be modelled. Predictions from the simulation results were found to be in good agreement with the actual experimentation
Removal of Zn (II) from aqueous solution by using hybrid precursor of silicon and carbon.
No full textHybrid precursor (HP) of silicon and carbon was synthesized from rice hulls by a novel low temperature method, using sol–gel route. The potential of hybrid precursor to remove Zn (II) ions from aqueous solutions was investigated under different experimental conditions. Hybrid precursor removes Zn (II) ions with efficiency higher than 95% at low concentration. The data revealed that initial uptake was rapid and equilibrium was established in 30 min. Pseudo first order, Pseudo second order and Intraparticle diffusion kinetic models were applied to the kinetic data and it was found that adsorption process followed pseudo second order with activation energy of 1.093 kJ mol−1. Zn (II) removal was quantitatively evaluated using Langmuir and Freundlich isotherm model and monolayer sorption capacity show the value 28.76 mg/g indicating the affinity of HP for Zn (II) ions. The negative value of Gibbs free energy obtained in this study with hybrid precursor confirms the feasibility and spontaneous nature of adsorption process
`Enhanced Removal of Phenol from Aquatic Solution in a Schorl-catalyzed Fenton-like system by Acid-modified schorl’\ud \ud
No full text` Prediction of Optimum Sorption Isotherms for Lead, Copper & Zinc onto Pyrophyllite : Error Analysis’.
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Effects of Some Solid Lubricants Suspended in Oil towards Controlling the Wear Performance of a Cast Iron.
No full textApplication of Neural Networks in Preform Design of Upsetting\ud Process Considering Unequal Interfacial Frictional Conditions.
No full textDesign of the optimum preform for near net shape manufacturing is a crucial step in upsetting process design. In this study, the same is arrived at using artificial neural networks (ANN) considering different unequal interfacial friction conditions between top and bottom die and billet interface. Back propagation neural networks are trained based on finite element analysis results considering four unequal interfacial frictional conditions and varying geometrical and processing parameters, to predict the optimum preform for commercial aluminum. Neural network predictions are verified for three new problems of commercial aluminum and observed that these are in close match with their simulation counterparts
Functional finishing of polyamide fabrics using ZnO–PMMA\ud nanocomposites.
No full textPolymer nanocomposites offer possibility of developing a new class of nanofinishing materials for textiles with their own manifold of structure property relationship. Approaches to modify the polymer nanocomposites by various inorganic substances can lead to a huge number of additional functionalities which are increasingly demanded by the textile industries. In the present work, zinc oxide nanoparticles were prepared by wet chemical method and ZnO–PMMA nanocomposites were prepared by dispersing the ZnO nanoparticles in solution of poly(methylmethacrylate) (PMMA) and applied on polyamide fabrics by padding. The aims are to\ud
impart superhydrophobicity and UV protection function\ud
to the polyamide textile surface and the functional properties of coated fabrics were studied. The nanofinished\ud
polyamide fabrics showed superhydrophobicity of about 163�. The results also showed that the impregnation of fabrics with ZnO–PMMA nanofinishings also enhanced the protection of polyamide fabrics against UV radiation
Enhanced Removal of Phenol from Aquatic Solution in a Schorl-catalyzed Fenton-like System by Acid-modified Schorl.
No full textSchorl modified by H2SO4 has been successfully developed to enhance schorl-catalyzed Fenton-like reaction for removal of phenol in an aqueous solution. The phenol removal percentage can be increased from 4% to 100% by the system of modified schorl and H2O2. Batch experiments indicate that the percent increases in removal of phenol by increasing the dosage of catalyst, temperature and initial concentration of H2O2. The results of XRD, FT-IR and SEM suggest that no new phases are formed after removal of phenol by modified schorl. ICP-AES results reveal that more dissolution of iron results in higher catalytic oxidant activity in the system of modified schorl and H2O2. Besides minor adsorption, mineralcatalyzed Fenton-like reaction governs the process
Stable Physically Adsorbed Coating of PolyVinyl Alcohol\ud for the Separation of Basic Proteins1.
No full textIn aqueous capillary electrophoresis, the electroosmotic flow can be strongly suppressed by coat�ing the inner surface of the capillary. In the present work hydrophilic coating of 4% polyvinyl alcohol (PVA) as been used for the analysis of basic proteins. The coating is simple and easy to obtain. The separation of ribonuclease and α�chymotrypsin has been uniquely done with other three basic proteins (lysozyme, cyto� chrome�c and trypsin) using a buffer 11.60 mM sodium acetate and 18.40 mM acetic acid at pH 4.5 in addi�tion to positive power supply of 20 kV at 25°C. Detection was performed using UV detector at 230 nm. The proposed PVA coated capillary provides reproducible separation of five basic proteins within 10 min with RSD values for mobility bellow 1.4% (n = 6) for all the five basic proteins. The stability of coated capillary has been checked up to 40 runs. The viscosity measurement for 4% PVA have been studied and scanning elec�tron microscope (SEM) images obtained to make it compatible with future micro�chip applications
