http://nopr.niscair.res.in/handle/123456789/36 http://nopr.niscair.res.in/retrieve/100 http://nopr.niscair.res.in/handle/123456789/36 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/17113 Title: Voltage-mode universal biquad with five inputs and two outputs using two current feedback amplifiers <br/> <br/>Authors: Horng, Jiun-Wei <br/> <br/>Abstract: A voltage-mode universal biquadratic filter using two current-feedback amplifiers (CFAs), two capacitors and four resistors, is presented. The new circuit has five inputs and two outputs and can realize all the standard filter functions, which are, lowpass, bandpass, highpass, notch and allpass filters, without changing the circuit topology. Some of the derived filter types enjoy the advantage of having two simultaneous output filter responses. One of the derived filter types enjoys the advantage of realizing non-inverting lowpass and inverting bandpass signals, simultaneously, with all the parasitic impedances of the CFAs can be absorbed by the outside passive components. Because the output impedance of the CFA is very low, the output terminals of the proposed configuration can be directly connected to the next stage. <br/> <br/>Page(s): 87-91 http://nopr.niscair.res.in/handle/123456789/17112 Title: Structural, optical, morphological and electrical characteristics of polyaniline for device applications <br/> <br/>Authors: Sharma, I D; Saini, P K; Sharma, V K <br/> <br/>Abstract: <span style="mso-ansi-language:PT-BR" lang="PT-BR">Polyaniline has been chemically synthesised by oxidative polymerization of 0.1 M aniline monomer using 0.3 M dodecyl benzene sulphonic acid (DBSA) as a dopant. The formation of polymer has been confirmed by X-ray diffraction and FTIR measurements where as surface morphology has been observed using scanning electron microscope. The spin coated polyaniline film has been prepared over ITO coated glass substrate and its current voltage response has been analyzed using Schottky emission theory. The band gap of the material has been calculated using UV visible spectroscopy and found to be 2.7 eV. The current-voltage response of deposited film gives the value of barrier height (Ø_b) and constant factor (β) as 0.307 eV and 1.89×10^-4,respectively. These films may have potential applications in electronic and optoelectronic sensing devices. </span> <br/> <br/>Page(s): 145-149 http://nopr.niscair.res.in/handle/123456789/17111 Title: Design of specific gravity factor of artificial lightweight aggregate <br/> <br/>Authors: Demirboğa, Ramazan; Kan, Abdulkadir <br/> <br/>Abstract: The aim of this paper is to obtain the thermal treated (modified) waste expanded polystyrene aggregates (MEPS) utility as a concrete aggregate and for mix design of concrete feasibility necessary specific gravity factor (SGF). A series of experiments are carried out to determine the SGF of MEPS. The value so determined is not an actual specific gravity but is only a factor. This factor may, however, be used in subsequent calculations as though it is the apparent specific gravity, using the principles of absolute volumes, so long as the moisture content and density of the aggregates remains unchanged. In this study, the cement dosages for concrete mixes are 400 and 500 kg/m³. The targeted ultimate compressive strength would be 8.0 MPa. Pre-wetted aggregate is used. The resulting concretes are seen to have densities varying from 800 to 1000 kg/m³, with the corresponding strengths varying from 5 to 8 MPa. The experimental results indicate that the SGF of MEPS aggregates for 400 kg cement dosage’s concretes are 0.22 and 0.31, and for 500 kg cement dosage’s concretes are 0.24 and 0.34, respectively, for coarse and fine aggregates. <br/> <br/>Page(s): 139-144 http://nopr.niscair.res.in/handle/123456789/17109 Title: Study of physical and rheological properties of wax modified binders using classic and SHRP testing methods <br/> <br/>Authors: Liu, Shengjie <br/> <br/>Abstract: Considerable effect of Fischer-Tropsch (FT) paraffin on improving the original asphalt properties along with reducing the emissions and saving energy, encouraged using this additive as an effective modifier. In this study, extensive laboratory investigations have been carried out using classic and SHRP testing methods. The results of both test methods show that adding FT paraffin into original asphalt reduce penetration, ductility at 15°C, and <i style="mso-bidi-font-style:normal">m</i>-value, while enhance penetration index, softening point and creep stiffness. Results indicate that there is an inflection point or inflection interval in ductility at 5°C. Rheological properties of modified specimens are investigated with DSR in temperature sweep and creep tests. Results indicate that the aforementioned parameters increase by increasing the FT paraffin content. Furthermore, at higher temperatures , increasing the FT paraffin additives content can reduce the binder viscosity and at lower temperatures less than the melting point of FT paraffin the reverse is true. <br/> <br/>Page(s): 132-138