Circular orbits of an electron around a proton in Schwarzschild geometry

The energy of an electron in circular orbits around a proton in Schwarzschild geometry has been investigated and is found to be red shifted. The electrical dipole moment of such a system is also estimated.     

Statistical mechanics of a Bethe lattice

The statistical mechanics of a spin-one Bethe lattice is discussed. The exact expression for Curie temperature is derived using a Bethe-Peierls approximations. The effect of the inclusion of a single-spin anisotropy to each Ising model of the lattice is also studied. It is seen that under certain situations a first-order phase transition appears.     

Correlated electrons in narrow channels

We investigate the properties of a system of interacting electrons in a narrow channel in the quantum Hall effect regime. We find that an increase in the strength of the Coulomb interaction causes abrupt changes in the width of the charge-density profile of translationally invariant states. The resulting phase diagram includes many of the stable odd-denominator states and also a novel fractional quantum Hall state at lowest half-filled Landau level. The collective modes evaluated at and at reveal soft modes in between the translationally invariant states in the phase diagram. 1997 Elsevier Science B.V. All rights reserved.     

Literature study of microwave-assisted digestion using electrothermal atomic absorption spectrometry

The literature on the use of microwave-assisted digestion procedures for subsequent sample analysis by means of electrothermal atomic absorption spectrometry (ETAAS) is reviewed. The literature survey reveals that this digestion technique has been applied mainly for biological materials. The elements most extensively determined by this method are cadmium and lead followed by copper, chromium, nickel and iron. The microwave digestion conditions, ETAAS furnace programmes and analytical details of the developed methodologies have been carefully revised.     

Synthesis of a functionalized D-glucose: A synthon for the carbomycins (magnamycins)

D-Glucose has been converted into its functionalized derivative $\text{7b}$ a synthon (C₁–C₆) of the carbomycin macrolide antibiotics.     

Model energy calculations of nuclear matter in the Jastrow variational approach

We calculate the model energy of nuclear matter within the FIY expansion scheme. Numerical results are presented for two semi-realistic central potentials and a state independent correlation function which is suitably constrained for good cluster convergence.     

An improved calculation for the inner-shell ionization problems

A calculation for the inner-shell ionization problems is made in a new approach. Results are compared with measured values for doubly and triply differential cross sections and improvements are noticed.     

Electrical and magnetic properties of antimony sulphide (Sb2S3) crystals and the mechanism of carrier transport in it

The principal magnetic susceptibilities, electrical conductivities and thermoelectric powers of Sb₂S₃ single crystals have been studied in the temperature range 100–550 K. An analysis of the results on the basis of its anomalous crystal structure and of the proposition of the hopping process of conduction at higher temperatures, account for the discrepancy between findings from magnetic and electrical observations.     

Mechanisms of antioxidant action: Stabilisation of polypropylene during processing and on exposure to light

The most important initiators for the photo-oxidation of processed polypropylene are thermally formed hydroperoxides. Peroxide decomposing antioxidants (ZnDEC and NiDEC) effectively control hydroperoxide formation, and hence oxidation, during processing. A chain breaking antioxidant (1076) is effective and a typical uv absorber (HOBP) completely ineffective. The uv stabilising activity of these compounds is NiDEC > HOBP > 1076 > ZnDEC; the first two show a strong concentration dependence whereas the last two do not. The two dithiocarbamates are relatively more effective at high temperatures and they synergise effectively with the uv absorber. The synergism obtained with ZnDEC is higher than that with NiDEC.