An automated thermoelectric power apparatus using electro-optic relays

We report the design and construction of a thermoelectric power apparatus using home-made electro-optic relays with Z-80A microprocessor for automatic data acquisition and control. The advantages of such relays made out of LED-LDR combinations for the measurement of ΔE and ΔT are discussed in detail.     

Beta decay rates for nuclei with 115<A<140 for r-process nucleosynthesis

For r-process nucleosynthesis the β-decay rates for a number of neutron-rich intermediate heavy nuclei are calculated. The model for the β-strength function is able to reproduce the observed half-lives quite well.     

Determination of the diffusivity-mobility ratio in degenerate semiconductors from linewidth measurements in laser diodes

In the present communication, it is shown that the diffusivity-mobility ratio of the electrons in degenerate semiconductors can be determined from a simple measurement of the linewidth of spontaneous emission preceding laser action in semiconductor junction lasers.The authors are indebted to Professor J. N.Bhar for his keen interest in the work.     

Band edge modulated conjugated polymers for oxidation prevention

The impact of electron transfer (ET) from a series of band edge modulated polymers to atmospheric oxygen is examined in connection with substrate oxidation prevention. Polymers with the highest occupied molecular orbital (HOMO) energy level below and above the oxygen energy level were tested and the former showed better efficiency. Furthermore, the oxidation prevention efficiency of a polymer with lower HOMO increased by two orders of magnitude, when the pores on the film were filled with spherical molecules, [6,6]-phenyl-C61-butyric acid methyl ester. We found that the polymer surface hydrophobicity has little or no influence on oxidation prevention. It is interesting to note that a polymer with a hole mobility of 8 × 10(-10) cm(2) V(-1) s(-1) showed a two-fold increase in oxidation prevention efficiency compared to a polymer with a hole mobility of 6 × 10(-5) cm(2) V(-1) s(-1). Over all, from the concerted approach, we conclude that a polymer devoid of pores with the HOMO energy level below oxygen and low charge carrier mobility is a suitable candidate for prevention of substrate oxidation/corrosion.     

Effect of carrier degeneracy on the diffusivity-mobility ratio in n-Cd3As2

An attempt is made to study the dependence of the diffusivity-mobility ratio on carrier concentration in degenerate n-Cd₃As₂ according to the Bodnar model which has recently been shown in the literature from studies on magnetic quantization to be the most valid model for Cd₃As₂. The results obtained are then compared with those derived on the basis of the Kane model to indicate the amount of error that would be involved with the use of the same model since many authors have continued to use it for Cd₃As₂.