Preparation of Ceramic Porous Body Using Different Volume Concentration of Ball Clay & Wheat Flour

The rheological study of the slurry containing ball clay and using different deflocculant (Sodium Silicate) concentration has been done. Slurry with different solid loading are prepared by taking ball clay and water in different proportions with solid loading 30%, 35% and 40% (by volume). Deflocculant with different concentrations are mixed with different slurries (with different solid loading). Deflocuculant with 5 different proportions was taken. Defloculant with 0.25%, 0.5%, 0.75%, 1 % and 1.25% (weight %) of the clay were taken and poured in a plastic bottle with alumina balls for wet milling for 12hrs. Rheology of the slurry was then studied by measuring the viscosity, sedimentation height and zeta potential of the slurry. Further with this optimized solid loading (30 Vol% Solid Loading) and the amount of deflocculant (0.85 wt. % of Ball clay), ceramic porous body was prepared with this fixed solid loading, but varying the ratio of ball clay and wheat flour. In this fixed solid loading, the wheat flour and ball clay was varied in the ratio 10:90, 20:80, 30:70, 40:60 and 50:50 by volume.The different slurry was prepared with varying ratio of wheat flour and ball clay as mentioned above. In this slurry, the amount of deflocculant was fixed 0.85% (wt %) of the total ball clay taken. These slurries were mixed through pot milling for 12 hours. Then the slurry was casted in a metal mold and kept at drier for 24 hours to get a cylindrical shaped body which was later fired at a different temperature. Different samples were fired at different temperatures to get the final ceramic porous body. Samples were fried at 11000C, 12000C and 13000C. Then characterization of the prepared ceramic porous body was done by determining Drying Shrinkage, Firing shrinkage, Apparent Porosity, Bulk Density and Cold Crushing strengt

A brief study on various time domain viscoelasticity model

A viscoelastic material stores energy and dissipates it in the thermal domain when subjected to dynamic loading and most interestingly the storage and loss of energy depend upon the frequency of excitation. To find a time domain model to represent the behaviour viscoelastic solids found interest of many researchers. Bagley and Torvik (1983, 1985) represented frequency dependent behaviour of viscoelastic solids by using four-model parameters and differential operators of fractional order. The time-domain model with ordinary integer differential operators was developed by Golla and Hughes (1985), who incorporated the hereditary integral form of the viscoelastic constitutive law in a finite element model. The finite-element equations are derived in the Laplace domain through the Ritz technique. McTavish and Hughes (1992, 1993) extended the Golla-Hughes model and formulated the GHM (Golla-Hughes-McTavish) model for linear viscoelastic structure

Pattern of Agricultural Diversification in India

Agricultural diversification as measured by increase in the percent of non-food crops has grown; whereas diversification as measured by the concentration indices has remained unchanged in the recent decade. There have been significant changes in the pattern of agricultural diversification at the regional level. Within a region, smaller sub-regions or pockets of specialization in certain crops and crop-groups have emerged. Farms do not remain diversified and the usual notion of crop diversification as a risk management practice is also belied in the present study. The study also found certain kind of structural changes in all sub-sectors of agriculture : crop, livestock, and fisheries. Concerns over extreme effects of such changes are however, not valid.agricultural diversification, Agriculture Analysis, India, non-food crops, crop, livestock, and fisheries

Planar Hall effect in the Weyl semimetal GdPtBi

Observation of Weyl and Dirac Fermions in condensed matter systems is one of the most important discoveries. Among the very few available tools to characterize Weyl semimetals through electrical transport, negative magnetoresistance is most commonly used. Considering shortcomings of this method, new tools to characterize chiral anomaly in Weyl semimetals are desirable. We employ planar Hall effect as an effective technique in half Heusler Weyl semimetal GdPtBi to study chiral anomaly. This compound exhibits a large value of 1.5 mohm cm planar Hall resistivity at 2 K and in 9 T. Our analysis reveals that the observed amplitude is dominated by Berry curvature and chiral anomaly contributions. Through the angle dependent transport studies we establish that GdPtBi with relatively small orbital magnetoresistance is an ideal candidate to observe large planar Hall effect .Comment: Updated text

Automatic Detection of Fake Profiles in Online Social Networks

In the present generation, the social life of everyone has become associated with the online social networks. These sites have made a drastic change in the way we pursue our social life. Making friends and keeping in contact with them and their updates has become easier. But with their rapid growth, many problems like fake profiles, online impersonation have also grown. There are no feasible solution exist to control these problems. In this project, we came up with a framework with which automatic detection of fake profiles is possible and is efficient. This framework uses classification techniques like Support Vector Machine, Naïve Bayes and Decision trees to classify the profiles into fake or genuine classes. As, this is an automatic detection method, it can be applied easily by online social networks which has millions of profile whose profiles can not be examined manually

Development of Automated Purchase System for NIT Rourkela

Procurement of Goods and services at NIT Rourkela is a thorough and long process and is currently done manually. It involves a large number of activities including fund allocation to sub-heads, enlistment of Goods and Services, registration of Suppliers etc. The purchase process itself can be done in four different ways - Direct Purchase, Advertised Tender Enquiry, Limited Tender Enquiry and Single Tender Enquiry. Also, the entire process requires the approval of a number of staffs at various stages. For this project, this entire process needs to be automated in the form of a web-based application. The application would not only make it easy for the staffs and faculties to carry out the purchase process by reducing their workload and lessening the time delays in the process, but also ensure complete transparency. The application would consist of seven different modules for Managing login, Managing Chart of Accounts (Account Categories, Heads, Sub-Heads, Funds, Goods/Services and Suppliers), Managing Direct Purchase, Managing Advertised Tender Enquiries, Managing Limited Tender Enquiries, Managing Single Tender Enquiries and Managing Purchase Requisitions

Suppression of superconductivity in nanowires by bulk superconductors

Transport measurements were made on a system consisting of a zinc nanowire array sandwiched between two bulk superconducting electrodes (Sn or In). It was found that the superconductivity of Zn nanowires of 40 nm diameter is suppressed either completely or partially by the superconducting electrodes. When the electrodes are driven into their normal state by a magnetic field, the nanowires switch back to their superconducting state. This phenomenon is significantly weakened when one of the two superconducting electrodes is replaced by a normal metal. The phenomenon is not seen in wires with diameters equal to and thicker than 70 nm.Comment: 4 pages, 5 figure