http://nopr.niscair.res.in/handle/123456789/8744 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/8840 Title: The pendula in mathematical sciences <br/> <br/>Authors: Kaushal, R S <br/> <br/>Abstract: The role played by the pendulum and its variants in the development of mathematical sciences is reviewed. In particular, the case of a pendulum viz. harmonic oscillator in physics is highlighted in the context of mathematical, conceptual, conventional and engineering disciplines besides the one in mathematical physics. It is pointed out that in all these applications the concept of pendulum is used as a vehicle of knowledge mainly on the basis of structural analogy. Finally, its role is an example of the consciousness-manifesting phenomenon, will be discussed. <br/> <br/>Page(s): 479-488 http://nopr.niscair.res.in/handle/123456789/8839 Title: High output impedance current-mode universal filter <br/> <br/>Authors: Shah, N A; Rather, M F; Iqbal, S Z <br/> <br/>Abstract: A new current-mode universal filter with single input and three outputs employing two second-generation current conveyors (CCIIs), one current follower (CF) and four grounded/virtually grounded passive elements is presented. The proposed circuit enjoys the following features: simultaneous realization of lowpass(LP), bandpass(BP), and highpass(HP) filtering responses, no need of matching conditions, employment of grounded resistors which are ideal for IC implementation, employment of grounded/virtually grounded capacitors, orthogonal control of ω₀and ω₀/ <i style="">Q</i>, high output impedance suiting cascadibility for higher order filters, and low passive sensitivity. PSPICE simulation results are included, confirming the workability of the proposed circuit. <br/> <br/>Page(s): 556-558 http://nopr.niscair.res.in/handle/123456789/8838 Title: Dielectric and conformational studies of methanol + ketone systems <br/> <br/>Authors: Madhurima, V <br/> <br/>Abstract: Semi-empirical conformational analysis of five methanol + ketone systems with a systematic study with the variation of the hydrogen bond angle have been studied. The results of the conformational analysis are compared with experimentally determined dipole moments of the five systems. The ketones chosen for the present study are acetone, 2-butanone, 3-pentanone, cyclohexanone and acetophenone. Conformational analysis is done using the PM3 semi-empirical Hamiltonian and the dipole moments are determined using dielectric relaxation studies at microwave X-band frequency (9.97 GHz). Further confirmation with previous ¹³C NMR chemical shift data is also sought. <br/> <br/>Page(s): 550-555 http://nopr.niscair.res.in/handle/123456789/8837 Title: X-ray K-absorption fine structure studies on some copper(II) complexes <br/> <br/>Authors: Vyas, R K; Joshi, S K; Shrivastava, B D; Shah, M C; Prasad, J <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> The X-ray K-absorption spectra of copper and arsenic in complexes [Cu( φ₃AsO)₂X₂] and [Cu( φ₃PO)₂X₂], where X = Cl or Br and φ = C₆H₅, have been studied using a 40 cm bent crystal spectrograph. Various X-ray absorption parameters such as edge shift, phase parameters and bond-distances have been estimated. Our studies reveal that triphenylarsine oxide is a better s-donor than triphenylphosphine oxide. The splitting of the main edge K into K₁and K₂components have been explained. The existence of the white line have been attributed to the transition of K-electrons into a high density of normally unoccupied states with p symmetry in the neighbourhood of the copper or arsenic atom. Further, our studies on phase shift determination indicate that variation in the first or second coordination environment around the central absorbing atom has a dominant effect on the values of backscattering phase shifts. </smarttagtype> <br/> <br/>Page(s): 509-516