http://nopr.niscair.res.in/handle/123456789/2986 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/3057 Title: High output impedance current-mode allpass inverse filter using CDTA <br/> <br/>Authors: Shah, N A; Quadri, Munazah; Iqbal, S Z <br/> <br/>Abstract: A novel current-mode (CM) first-order all-pass (AP) inverse filter has been presented. The proposed circuit has two inputs and a single output with both the inputs providing the first-order all-pass inverse responses independently. The circuit employs bare minimum number of both active and passive components, viz. one each of CDTA, capacitor and resistor. The output current is available at high impedance thereby making the circuit very attractive from the viewpoint of cascadibility. The realizibility condition is simple. The theoretical results are verified by PSPICE simulation. <br/> <br/>Page(s): 893-896 Fri, 28 Nov 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/3055 Title: Study of filamentary behaviour in coaxial dielectric barrier discharge lamp <br/> <br/>Authors: Khatun, Hasina; Mishra, Alok; Kumar, Mahesh; Pal, Udit N; Sharma, A K; Barhai, P K <br/> <br/>Abstract: In this study, filamentary discharges have been investigated at 1.5 mm dielectric-dielectric electrode gap of a coaxial dielectric barrier discharge (DBD) quartz tube filled with nitrogen gas. Different types of discharge patterns have been established in the tube using alternating field (35-45 kHz). Electrical characteristics of the discharge have been investigated, which mainly depend on gas pressure, applied frequency and voltage amplitude. The on set of the discharge current occurs earlier at higher operating voltage due to the increased value of E/n, where E is the electric field and n is the neutral gas density. The observed phenomenon occurs due to increase in rate of voltage rise time. At higher voltage, increase in net current increases the chances of electron impact. Analysis of the voltage versus charge plot (lissajous figure) supports the theory of capacitances of a double barrier discharge. The energy consumed per cycle of the DBD source measured using lissajous figure is few milli joules. Energy consumption per cycle is the key parameter for evaluating the efficiency of the device. <br/> <br/>Page(s): 889-892 Fri, 28 Nov 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/3054 Title: Characterization of bioactivity in transition metal doped-borosilicate glasses by infrared reflection and dielectric studies <br/> <br/>Authors: Azooz, M A; Aiad, T H M Abou; ElBatal, F H; ElTabii, G <br/> <br/>Abstract: Borosilicate glasses with the addition of one of the 3d-transition metals (Ti→Cu) (0.1 g/100g glass) have been investigated as possible materials having bioactivity by infrared reflection spectroscopy and electrical properties after the immersion in simulated body fluid (SPF) for different interval of times. The results show obvious effects of the transition metal ions on the bioactivity of the borosilicate glasses. The results are discussed taking into consideration recent achievements that govern the formation of hydroxyapatite surface layer on glass. Also, IR and electrical results are discussed in relation to the glass composition and structure, which confirm the effect of the formation of HAp layer and the possible mixed ionic and electronic mechanisms due to the addition of transition metal oxides. <br/> <br/>Page(s): 880-888 Fri, 28 Nov 2008 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/3053 Title: Ground state properties of two dimensional quantum-dot helium in magnetic field <br/> <br/>Authors: Elsaid, Mohammad K; AL-Naafa, Mohammad A; Zugail, Salah A <br/> <br/>Abstract: The ground-state properties of two-dimensional quantum-dot helium have been studied. The shifted 1/N expansion method has been used to solve the relative part Hamiltonian of two electrons confined in a quantum in the presence of an applied uniform magnetic field. The spin singlet-triplet transition in the ground state of the QD-helium is also shown. Based on comparisons, the eigen energies obtained by the shifted method are in excellent agreement with both exact and variational methods. <br/> <br/>Page(s): 876-879 Fri, 28 Nov 2008 22:58:59 GMT