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Research on the integration of mathematics history into the teaching of Higher Mathematics
No full textThis article researches the understanding and evaluation of tf mathematics history and its applying to the higher mathematics teaching, discusses the significance and role of history of mathematics in higher mathematics teaching, researches the method and means which the history of mathematics is introduced into higher mathematics teaching
Bayesian One- Way Repeated Measurements Model Based on Bayes Quadratic Unbiased Estimator
Get PDFIn this paper, bayesian approach based on Bayes quadratic unbiased estimator is employed to the linear one- way repeated measurements model which has only one within units factor and one between units factor incorporating univariate random effects as well as the experimental error term. The prior information obtained by using variance analysis technique to represent prior estimates of the parameters of the model. Then, the prior distribution is considered as a uniform distribution
Improved Newton-Raphson Methods for Solving Nonlinear Equations
Get PDFIn this paper, we mainly study the numerical algorithms for simple root of nonlinear equations based on Newton-Raphson method. Two modified Newton-Raphson methods for solving nonlinear equations are suggested. Both of the methods are free from second derivatives. Numerical examples are made to show the performance of the presented methods, and to compare with other ones. The numerical results illustrate that the proposed methods are more efficient and performs better than Newton-Raphson method
Strength Characteristics of Concrete with Indian Mettakaolin and Rice Husk Ash
Get PDF Concrete is the most extensively used construction material around the world and its properties have been undergoing changes through technological advancements. Varieties of concrete have been developed to enhance the different properties of concrete. An investigation in to the potential use of partial replacement of mineral admixture in high performance concrete (HPC) has carried out. The engineering properties of fresh and hardenedconcrete are obtained by conducting test on slump, vee-bee, compaction factor and compressive strength, flexural strength, spilt tensile strength and modulus of elasticity, in this project partial replacement of cement bymetakaolin and rice husk ash been used for varying replacement of 0+0%, 5+105, 7.5+10%,10+10%,5+12.5%, 10+12.5%, 5+15%, 7.5+15%, and 10+15%for high strength, workability and also an eco-friendly by less emission of co2. It has been concluded that strength development of concrete blended with metakaolin and rice hush ash was enhanced. It was found that in 7.5% replacement of metakaolin and 12.5% replacement of rice husk ash appear to be the optimum replacement which exhibited more strength. This investigation has proved that the MK and RHA concrete can be used as structural concrete at suitable replacement percentage.Â
EXPERIMENTAL INVESTIGATION OF MECHANICAL PROPERTIES OF UNTREATED NEW AGAVE ANGUSTIFOLIA MARGINATA FIBER REINFORCED EPOXY POLYMER MATRIX BIO-COMPOSITE MATERIAL
Get PDFIn recent years, the natural fibers playing a vital role in worldwide. The main purpose of using natural fiber is biodegradable, cost wise low, easily available and at the same time strength to weight ratio is high. In this work, the Agave Angustifolia Marginata fibers (AAMFs) reinforced composite were made by compression molding machine (CMM) with various proportions of epoxy resin. The manufactured composite laminates were tested through the tensile, flexural, Impact and compression test according to ASTM standards. The results indicated that the composite with 35 weight percentage of the fibers having superior mechanical properties. The compression properties were improved in the 60:40 ratios. The surface morphology shows the great attachment or bonding was not seen between the fibers and epoxy as appeared in 60:40 proportion of composite. The strength of the fiber and composites will definitely improve after the best chemical treatment proces
Decomposition of NOx and PM emission in Diesel Exhaust by Electrochemical reactor with Multilayered Electrodes
Get PDFNOx emissions are highly poisonous and reactive gas liberated excessively from diesel engines. This work attempts to decrease NOx emissions by developing electrochemical reactor. The electrochemical reactor consists of electrochemical cells placed inside it. The electrochemical cells are fabricated by YSZ as an electrolyte middle layer coated with NiO -YSZ as cathode layer and Ag-YSZ as anode layer. The electrochemical cells are tested with diesel exhaust in a single cylinder dieselengine. By passing the variable voltage to the electrochemical cell, it is observed that up to 70% NOx reduction and 65% PM reduction was achieved with electrochemical cell. Further by coating the BaO NOx storage material, NOx reduction was reduced to 75% and PM reduction up to 70% was achieved. NOx reduction was greater with electrochemical cell -2.The presence of NOx storage material causes more NOx decompositions in the cathode layers. NOx decomposition also increases the oxygen concentrations, which further oxidizes the HC and PM emissions.The increase in NO decomposition was due to the increase in the ionic conductivity of the YSZ substrate. NOx reduction by electrochemical cell is a cost effective method.
 
THE CONVERSION OF N – METHYLANILINE AND N –, 2 – DIMETHYLANILINE BY USING DIFFERENT CATALYSTS
Get PDFThe catalytic conversion of N methylaniline and N, 2 dimethylaniline in the presence of Pd HSHM, CuFe2O4·γ·Al2O3 and vanadium chromium aluminium (VChA) oxide systems has been investigated. The comparative analysis of the results of the conversion of three different feedstocks with VChA catalyst shows that the xylidines, especially 2,6 dimethylaniline is formed as a result of the methylation of aromatic amine because of the carbon in nucleus
ON CERTAIN TOPOLOGICAL INDICES OF BENZENOID COMPOUNDS
Get PDFDrug discovery is mainly the result of chance discovery and massive screening of large corporate libraries of synthesized or naturally-occurring compounds. Computer aided drug design is an approach to rational drug design made possible by the recent advances in computational chemistry in various fields of chemistry, such as molecular graphics, molecular mechanics, quantum chemistry, molecular dynamics, library searching, prediction of physical, chemical, and biological properties. The structure of a chemical compound can be represented by a graph whose vertex and edge specify the atom and bonds respectively. Topological indices are designed basically by transforming a molecular graph into a number. A topological index is a numeric quantity of a molecule that is mathematically derived from the structural graph of a molecule. In this paper we compute certain topological indices of pyrene molecular graph. The topological indices are used in quantitative structure-property relationships (QSPR) and quantitative structure-activity relationships (QSAR) studies.Â
Performance of BFRP and GFRP Hollow Circular Steel columns subjected to axial compression loads
Get PDFRecent research has been focused on rehabilitation and strengthening of deteriorated steel structures and bridges using Fiber Reinforced Polymer (FRP) materials. This paper deals with the behavior of FRP confinement of hollow steel sections subjected to axial compression loads. The load carrying capacity and buckling failure patterns of hallow steel sections strengthened by different FRP were studied experimentally. Numbers of circular hallow steel sections of same diameter with different L/D ratio test specimens were fabricated. Three different L/D ratio test specimens were used as control specimens. The different number of layers in FRP such as basalt (BFRP) and glass (GFRP) fabrics in different orientations has been fabricated. The effects of strengthened elements were observed under axial compression load. The load vz slenderness ratio, stress strain relationship, the ultimate load vz orientation and number of ply wrapping by different FRP were deeply analyzed and are plotted, tabulated and discussed. Besides local and overall buckling modes, failure patterns and rupturing of fiber of strengthened and non strengthened specimens were also observed. It is concluded that BFRP fabric wrapped by double layers in the circumferential direction elements withstand more axial compressive load than other strengthened and non strengthened elements
EFFECTS OF PROCESS PARAMETERS AND OPTIMIZATION OF MECHANICAL AND METALLURGICAL BEHAVIOUR FOR DISSIMILAR MATERIAL BY ELECTRICAL RESISTANCE SPOT WELDING.
Get PDFElectrical resistance Spot Welding is a pressure welding used for joining of sheet metals or wires. The welding heat is produced at the desired location by electrical resistance through the metal pieces. ERSW is highly used due to its fast rate of production, less maintenance, free from smoke etc… ERSW is experimented in dissimilar materials (Stainless steel –Mild steel) to analyze the effect of process parameters such as welding current, welding time and electrode force. The welded parts were applicable to tensile test and hardness test .Thus the influence of parameters on weld quality was categorized