Phase Transition Study of Thermal Dependence of Soft Mode Frequency,Dielectric Constant and Dielectric Tangent Loss Properties in CsH2PO4 (CDP) and CsD2PO4 (DCDP) Crystals

Journal of Low Temperature Physics - Modified two-sublattice pseudospin lattice coupled-mode (PLCM) model Hamiltonian by adding third- and fourth-order anharmonic interactions, extra...     

Admissibility of a test procedure based on preliminary test of significance for life data

Necessary and sufficient condition for admissibility of a test procedure based on preliminary test of significance for life data has been obtained.     

Estimation of average life for negative exponential distribution

This paper deals with the problem of average life estimation when the life times follow negative exponential distribution. A minimum mean square error estimator belonging to the class of linear combination of complete sufficient statistics has been obtained. The estimator thus obtained requires knowledge of coefficient of variation. The effect of using a guessed value of coefficient of variation on the estimator has also been studied.     

Assessment of carbonic anhydrase activity in blood by alteration in pH

Carbonic anhydrase enzyme activity could be measured by manometeric and colorimetric techniques. A simpler and modified method of carbonic anhydrase enzyme activity assessment in blood is proposed. In the present method differences in pH by hydration of CO2 in absence and presence of carbonic anhydrase inhibitor have been used to measure the carbonic anhydrase activity in the blood.     

Bayes results for classical Pareto distribution via Gibbs sampler,with doubly-censored observations

The paper considers the full Bayes analysis of the Pareto distribution when the observations are doubly censored, and provides sample-based estimates of posterior distributions using Gibbs sampler algorithm. The approach is not only computationally simple but fully explores the low-dimensional posterior surfaces-which otherwise seems difficult. Complexities through censored data always arise in life testing experiments; these complexities are no longer problems with the Gibbs sampler algorithm, unlike the situations with nonsample-based approaches     

Gonadal preservation in a simple testicular cyst

The authors report a case of a simple testicular cyst in a 16-week-old infant. Preoperative ultrasonography helped to diagnose this condition accurately. Gonadal preservation and enucleation of testicular cysts are possible with a careful surgical approach, and orchiectomy is not necessary.     

Analysis and design of a half-bridge parallel resonant converter

A half-bridge parallel resonant converter (PRC) is analyzed in detail for both continuous-conduction-mode and discontinuous-conduction-mode operations to provide more straightforward and easy-to-use design tools. Closed-form solutions are derived for the PRC operating under steady-state conditions. Theoretical results obtained are presented in the form of normalized design graphs. They could be directly utilized in designing a half-bridge PRC, having up to 2:1 input voltage variation. They do not necessitate converting the obtained ratings, depending on the input voltage and load variations, to check the worst case values. A design example of a 500 kHz 150 W offline switching power supply is given for both modes of operation, and it is implemented for experimental verification.<>     

The magnetic properties of the MgCd ferrite system by Mössbauer spectroscopy

The Mg-Cd ferrite system has been studied in detail by means of Mössbauer effect at 80K. Mössbauer spectra for x = 0.0 to 0.6 suggest the existance of two hyperfine fields, one due to the Fe³⁺ octahedral ions (B-sites) and the other due to the Fe³⁺ tetrahedral ions (A-sites), while for x = 0.8 it shows relaxation behaviour and for x ≥ 0.9 it exhibits a paramagnetic quadrupole doublet. The variation of nuclear magnetic fields at the A and B sites are explained on the basis of supertransferred hyperfine interactions. It has been found that the QS increases from MgFe₂O₄ to CdFe₂O₄ as the cadmium concentration is increased.     

Synthesis,characterization and polycondensation of Bis-(4-hydroxybutyl) terephthalate

Summary Monomeric Bis-(4-hydroxybutyl) terephthalate has been synthesized and characterized. Titanium iso-propoxide has been found to be a superior catalyst for transesterification compared to metal acetates. Further polycondensation of Bis (HBT) yields poly (1,4-butylene terephthalate). The effect of various titanium derived catalysts on the polycondensation of Bis (HBT) has been studied. The catalytic efficiency of these derivatives is ascribed to their relative hydrolytic stability and the degree of interaction between the carbonyl oxygen and the metal.