Sunday, 22 September 2019

Engineering Journal: July 2019

Engineering Journal: published its volume-5, Issue-7, July 2019 with AD Publications

Smart and Economical Scheme for Electrical Power Generation

Abstract This article advises a simple and innovative scheme for generating electricity from human activities. A simple and robust approach is proposed for converting human walking into valuable electricity source. The proposed scheme could be sufficient for powering small portable devices and providing independent power supply. Matlab and Simulink dynamic platform are used for stimulating the systems under concern. The prototype results validate the simulation results. The proposed scheme proofed to be valuable, economical and reliable power supply.

Keywords— Pressure, Energy converter, Electricity, Boost converter, Portable.

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Manual Correction of Myopia, Hypermetropia, Astigmatism, Presbyopia & Keratoconus.

Abstract— A new method has been designed to correct myopia, hypermetropia, astigmatism and presbyopia of very high power. If 1mm of cornea is tucked, then it corrects 3.174 D & If 1mm of horizontal diameter of cornea is reduced, then it corrects +4.1D. This procedure is reliable, safe, cheapest and simplest. Because of the use of simple procedure to split the cornea, adjustable nonabsorbable sutures, correction of very high myopia and hypermetropia along with astigmatism and presbyopia, the procedure is expected to be accepted.

Keywords— Arc of cornea, chord, angle of arc, myopia, hypermetropia, astigmatism, formula.

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Synthesis and Properties of Asymmetric Polyamidosulfoimides on the Basis of Dichloroanhydrides of Saccharin-5-Carboxylic Acids and Aliphatic Diamines

Abstract By polycondensation of dichloroanhydride of saccharin-5-carboxylic acids with aliphatic diamines in dimethylacetamide at room temperature the asymmetric polyamidosulfoimide has been synthesized. The influence of nature of solvent, concentration of the initial reagents and reaction temperature on value of characteristic viscosity and also on solubility, thermal stability and deformation-strength properties of the synthesized polyamidosulfoimides has been investigated. It has been elucidated that a growth of a quantity of methylene groups in the polymer leads to the improvement of solubility of the polymers in dimethylformamide and dimethylacetamide, but at the same time leads to the relative deterioration of thermal stability.

Keywords aliphatic diamines, dichloroanhydride of saccharin-carboxylic acids, polyamidosulfoimide, saccharin-5-carboxylic acid.

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Approximate 3-D model for analysis of laminated plates with arbitrary lay-ups, loading and boundary conditions

AbstractAvailable exact solution techniques of elasto-static problems entail limitations on the choice of lay-ups, loading and boundary conditions and impose restrictions on strain and stress fields as well, to overcome algebraic difficulties inherent to modeling of laminated and sandwich composites. Therefore in fact they become unsuitable for testing accuracy of modern laminated plate theories aiming to very accurately describing 3-D stress fields in real conditions of use of multilayered composites, nowadays widespread in engineering applications. To overcome the assumption of too restrictive hypotheses, an approximate 3-D solution technique is proposed and assessed that is able to automatically solve problems which due to the lay-ups, loading and boundary conditions assumed would not be solved with the exact techniques available. A quite general, accurate structural model is developed that comes to constitute a generalization of available physically-based zig-zag theories, being free from through-thickness assumptions and because zig-zag functions are not explicitly contained, the layerwise contributions being represented by the redefinition of coefficients of the through-thickness series expansion. It is based solely on the prescriptions of the theory of elasticity, i.e., displacement and stress compatibility at interfaces, fulfillment of local equilibrium equations at points across the thickness and of stress boundary constraints. A truncated expansion series of trial functions and unknown amplitudes is used to represent variables, whose coefficients are determined in exact form using a symbolic calculus tool that enforces all elasticity constraints and in conjunction with Rayleigh-Ritz and Lagrange multipliers methods.

KeywordsComposite and sandwich plates, zig-zag theories, interlaminar transverse shear/normal stress continuity, localized and distributed loadings, FEA 3-D, elastostatic solutions.

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