http://nopr.niscair.res.in/handle/123456789/9727 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/9849 Title: Influence of combined Al₂O₃-SiO₂ filler on thermal and dielectric properties of barium zinc borate glass microcomposites for barrier ribs of plasma display panels <br/> <br/>Authors: Das, Mousumi; Singh, Shiv Prakash; Pal, Karan; Jena, Suchika; Karmakar, Basudeb <br/> <br/>Abstract: The co-effects of Al₂O₃-SiO₂ filler to an extent of 25 wt.% on thermal (softening point and coefficient of thermal expansion) and dielectric constant of lead free BaO-ZnO-B₂O₃-SiO₂-Li₂O-Na₂O (BZBSLN) glasses have been explored with a view to use as barrier ribs of plasma display panels (PDPs). The interaction of fillers with glass occurred during firing (570°C) has also been investigated by XRD, SEM micrograph and FTIR spectroscopy analyses. The fillers have been found to be partially dissolved in the glass at the firing temperature leaving some unreacted residual filler which result in ceramic-glass microcomposites. All the properties are found to follow the same experimental and theoretical trends, and regulate by the covalent character as well as the optical basicity of microcomposi <br/> <br/>Page(s): 199-207 http://nopr.niscair.res.in/handle/123456789/9848 Title: Damage prediction in glass/epoxy laminates subjected to impact loading <br/> <br/>Authors: Karakuzu, Ramazan; Erbil, Emre; Aktas, Mehmet <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> In this paper, the impact behaviour of glass/epoxy laminated composite plates with [0/±θ/90]_S fiber orientation is investigated numerically at equal energy (40 J), equal velocity (2 m/s) and equal impactor mass (5 kg). In order to examine the stacking sequence effect, five different ±θ fiber directions are chosen as 15°, 30°, 45°, 60° and 75°. Three different plate thicknesses as 2.9 mm, 5.8 mm, and 8.7 mm are also selected to survey the thickness effect on impact behaviour of glass/epoxy composite plates. The overlapped delamination area is obtained for composite plates with different stacking sequences and different thicknesses. A transient finite element code 3DIMPACT is used for numerical analyses. In this code an eight-point brick element and the direct Gauss quadrature integration scheme are used through the element thickness to account for the change in material properties from layer to layer. The Newmark scheme is also adopted to perform time integration step by step. In addition, a contact law incorporated with the Newton-Raphson method is applied to calculate the contact force during impact. Numerical results are compared with the experimental study and it has been seen that they are in good agreement with the experimental results. </smarttagtype> <br/> <br/>Page(s): 186-198 http://nopr.niscair.res.in/handle/123456789/9847 Title: Modeling slump of concrete using the group method data handling algorithm<span style="font-family: DFKai-SB;"> </span> <br/> <br/>Authors: Chen, Li <br/> <br/>Abstract: This paper proposes the group method data handling (GMDH) algorithm and applies it to estimate the slump of high-performance concrete (HPC). It is known that HPC is a highly complex material whose behaviour is difficult to model, especially for slump. To estimate the slump, it is a nonlinear function of the content of all concrete ingredients, including cement, fly ash, blast furnace slag, water, superplasticizer, and coarse and fine aggregate. Therefore, slump estimation is set as a function of the content of these seven concrete ingredients and additional four important ratios. The GMDH algorithm presented in this paper has the advantage of a heuristic self-organized and gradually complicated model for the complicated multi-variable HPC slump estimation. The model establishes the input-output relationship of a complex system using a multilayered perception-type structure that is similar to a feed-forward multilayer artificial neural network (ANN), but it expresses relationships using more explicit functions than ANN. Moreover, the GMDH has the ability to select significant variables and combine them properly and automatically. The results show that GMDH obtains a more accurate mathematical equation through learning procedures which outperforms the traditional multiple linear regression analysis (RA) and ANN, with lower estimating errors for predicting the HPC slump.<span style="font-family: DFKai-SB; color: black;" lang="EN-GB"> </span> <br/> <br/>Page(s): 179-185 http://nopr.niscair.res.in/handle/123456789/9846 Title: High input impedance first-order allpass, highpass and lowpass filters with grounded capacitor using single DVCC <br/> <br/>Authors: Horng, Jiun-Wei <br/> <br/>Abstract: Received 5 January 2010; accepted 4 May 2010 A voltage-mode high input impedance first-order allpass, highpass and lowpass filters using one differential voltage current conveyor (DVCC), one grounded capacitor and two resistors is presented. The allpass, highpass and lowpass signals can be obtained simultaneously from the circuit configuration. The simulation results confirm the theoretical analysis. <br/> <br/>Page(s): 175-178