Showing papers by "V. R. K. Murthy published in 1994"
TL;DR: An automated ferroelectric hysteresis loop tracer, developed using an INTEL 8085 microprocessor, is described in this article, where the setup is interfaced with a personal computer to obtain directly the values of loop parameters.
Abstract: An automated ferroelectric hysteresis loop tracer, developed using an INTEL 8085 microprocessor is described. This setup can be used to study the growth of a hysteresis curve at any desired temperature instantaneously after the application of a field. Since the setup allows the storage of data for each cycle of the applied field, this can be used to study the response of ferroelectric domains in an applied alternating field with time on unpoled or poled samples. The setup is interfaced with a personal computer to obtain directly the values of loop parameters.
5 citations
TL;DR: In this paper, the applicability of the modfied Lippincott δ-function model method for binary mesophase mixtures was tested and compared with the reported values.
Abstract: The applicability of the modfied Lippincott δ-function model method is tested for binary mesophase mixtures. Using this method, the polarizabilities, polarizability anisotropies and order parameters of binary mesophase mixtures containing N-(ρ-propoxy-benzylidene)-p-pentylaniline are evaluated and compared with the reported values. Α close agreement is observed between the estimated values and reported values. PACS numbers: 61.30.—v, 35.20.My
2 citations
TL;DR: In this paper, the molecular vibration method and the quantum mechanical δ-function model are applied to obtain the bond polarizability values of purine and its derivatives such as adenine and guanine, with special reference to the electrophilic and nucleophilic reactivity of the carbon atoms.
2 citations
TL;DR: In this article, a technique for the simultaneous measurement of the dc conductivity and microwave properties on the same sample is described, and the difference in transition temperatures between dc and microwave frequencies at ≈6.2 GHz (J-band), ≈9.5 GHz (P-band) and ≈17.8 GHz (p-band).
Abstract: A technique for the simultaneous measurement of the dc conductivity and microwave (ac) properties on the same sample is described. The difference in transition temperatures between dc and microwave frequencies (i) at ≈6.2 GHz (J-band), ≈9.2 GHz (X-band), ≈13.5 GHz (P-band), and ≈17.8 GHz (P-band) on YBaCu oxide and (ii) at ≈6.2 GHz on YBaCu oxide thin films and BiPbSrCaCu oxide has been evaluated. From the observations of these simultaneous measurements, the energy dependent variations of these simultaneous measurements, the energy dependent variation of ΔTc (Tc(dc) – Tc(ac)) and the non-zero microwave power loss beyond the superconducting transition temperature are discussed.
1 citations
TL;DR: In this paper, the molecular vibration method and the quantum mechanical δ-function model are applied to obtain the bond polarizability values of purine and its derivatives such as adenine and guanine, with special reference to the electrophilic and nucleophilic reactivity of the carbon atoms.
Abstract: Heteroaromatic studies of purine and a few of its derivatives such as adenine and guanine are discussed with special reference to the electrophilic and nucleophilic reactivity of the carbon atoms. The molecular vibration method and the quantum mechanical δ-function model are applied to obtain the bond polarizability values. The bond polarizability coefficients reveal the aliphatic or nucleophilic and aromatic or electrophilic nature of the carbon atoms present in the purine ring. The results are discussed in relation to X-ray diffraction studies, NMR chemical shifts and quantum chemical calculations. The good agreement suggests the applicability of the polarizability studies to the heteroaromatic studies.