Analysis of a bonded connector for pultruded G.R.P. structural elements

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The Relation between Uniaxial Compressive Strength and Block Punch Index for Pyroclastic Rocks

24th INTERNATIONAL MINING CONGRESS OF TURKEY -- APR 14-17, 2015 -- Antalya, TURKEYWOS: 000380558200080Because preparing the desired smooth specimens from pyroclastic rocks is difficult for some standard tests, the development of some equations is important for predicting the uniaxial compressive strength (UCS) of these rocks. In this study, the relation between the UCS and block punch index (BPI) for pyroclastic rocks was investigated. Twenty eight different samples of pyroclastic rocks collected from the Cappadocia Region were tested in the laboratory. The linear regression analysis shows that the UCS-BPI conversion factor for the tested rocks is 3.0. On the other hand, the correlation coefficient of power law function is higher than that of the linear function. Concluding remark is that the UCS-BPI conversion factor for the pyroclastic rocks is lower than the suggested general conversion factor of 5.5 and the UCS-BPI relation is best represented by power law function.UCTEA Chamber Min Enigneers Turke

Design of a short tensile coupon for fiber reinforced plastic using artificial neural networks

The measurement of the mechanical properties of Fibre Reinforced Plastic (FRP) material is necessary for numerical structural analysis and design. The mechanical properties of the FRP materials may be determined by specific coupon test methods or by analytical calculation. However, pultruded or moulded FRP components may not possess the dimensions to permit the extraction of standard length coupons. The shape of the short tensile coupon has been established to circumvent this limitation using a Finite Element (FE) representation and Artificial Neural Network (ANN) including the effect of gripping length, coupon shape, width, length and thickness. The FE results have been used for the learning and testing sets of the ANN. The Multi-Layer Perceptron (MLP) has been employed in the modelling of the ANN. The MLP model has been trained using the Scaled Conjugate Gradient Algorithm (SCGA) and tested. The ANN results show that the correlation between targets and outputs are consistent

Biodiesel production from ricinus communis oil and its blends with soybean biodiesel

In this study, local vegetable oil named as Ricinus Communis (RC) is used as the raw material for the production of biodiesel. In order to obtain RC oil, Soxhalet Extraction apparatus was used. This paper deals with the transesterification of Ricinus Communis oil with methanol to produce biodiesel. Moreover, this study analysis the fuel properties of RC biodiesel and soybean biodiesel blends. Various properties of the RC biodiesel, Soybean biodiesel and their blends such as the cold filter plugging point (CFPP), cetane number, flash point, kinematic viscosity and density were determined. Test results were compared well with European biodiesel standards EN 14214. Analysis showed that the cetane number and the cold flow behavior of the RC biodiesel and soybean biodiesel blends were improved due to the high cetane number (80) and the low cold filter plugging point (-35 °C) of RC biodiesel. © 2010 Journal of Mechanical Engineering. All rights reserved

Performance and emission studies of castor bean (Ricinus Communis) oil biodiesel and its blends with diesel fuel

An experimental study was conducted to evaluate the use of various blends of castor (Ricinus Communis) oil methyl ester with diesel fuel. Performance and exhaust emissions of castor oil biodiesel with diesel fuel in a commercial compression ignition engine were presented in this study. Biodiesel produced from castor oil was blended with diesel fuel at the volumetric ratios of 5% (B5), 10% (B10), 25% (B25), 50% (B50), and 100% (B100). Fuel properties of castor oil methyl ester and its blends with diesel fuel were stated. The performance results showed that blends of castor oil methyl ester with diesel provided an increase on brake specific fuel consumption and a small decrease on brake power output. Compared with diesel fuel, diesel-castor oil methyl ester blends showed that while the carbon monoxide and carbon dioxide emissions became reduced; the oxides of nitrogen emissions observed higher than diesel fuel emission characteristics. Test results showed that B25 was determined as a suitable alternative fuel for diesel engines. © 2012 Copyright Taylor and Francis Group, LLC

Schiff base polymers obtained by oxidative polycondensation and their Co(II), Mn(II) and Ru(III) Complexes: Synthesis, characterization and catalytic activity in epoxidation of styrene

In this paper, Schiff base monomers having double azomethine groups, N,N'-bis(4-hydroxybenzylidene)1,4-phenylenediamine (M 1) and N,N'-bis(4-hydroxysalicylidene)1,4-phenylenediamine (M 2), were prepared by a common condensation reaction between 4-hydroxybenzaldehyde and 4-hydroxysalicylaldehyde with 1,4-phenylenediamine, respectively. The new Schiff base polymers, poly(N,N'-bis(4-hydroxybenzylidene)1,4-phenylenediamine) (P 1) and poly(N,N'-bis(4-hydroxysalicylidene)1,4- phenylenediamine) (P 2) were synthesized from the oxidative polycondensation of monomers with NaOCl in an aqueous alkaline medium. The characterization of synthesized monomers and polymers was carried out by FT-IR, UV-Vis, 1H-NM, 13C-NMR and elemental analysis. The new polymer-metal complexes were prepared by using polymers and Co(II), Mn(II) and Ru(III) metal salts. Thermal properties of the compounds were studied by TG-DTA techniques. In addition, the catalytic properties of the polymers and their metal complexes were investigated in epoxidation reactions of styrene. The results of the catalysis studies were monitored by GC-MS. © 2012 Koninklijke Brill NV, Leiden.106 T 365The authors thank The Scientific and Technological Research Council (Tübitak) for financial support (Project No. 106 T 365)

Examination of the Energy Efficiency of Wall Building Elements Used in Dwellings

In this study, within the scope of the number of studies related to the efficient use of energy increasing day by day, the thermal insulation performance of wall elements used in dwellings was determined using experimental methods. With this aim, a 1/3 scaled reinforced concrete structure with the complete characteristics of an actual structure, was built and the column spans were filled using six different types of wall element. These materials, widely used in dwelling production in Turkey, were applications of horizontal coring bricks, vertical coring bricks, pumice, gas concrete, block brick and a cavity wall. The interior temperature was kept constant by placing a thermal source inside the built sample construction and the temperatures for different exterior temperatures were measured with a thermocouple and camera from each wall surface. Thus, by interpreting the obtained surface temperature data, the energy efficiency of the wall types used was presented, the thermal conductivity resistance, thermal conductivity coefficient, and loss of heat as regards to TSE 825 were calculated and accordingly, the thermal conductivity performances of walls were compared