[en] The document reproduces the texts of the enclosures of the note verbale of 2 September 1998 received by the Director General of the IAEA from the Permanent Mission of Belgium to the IAEA. In these enclosures the government of Belgium makes available information on its national holdings of civil unirradiated plutonium and of plutonium contained in spent civil reactor fuel, as of 31 December 1997

[en] Due to increasing agricultural activity after the 1960's both shallow and deep water resources in the Czech Republic including karstic systems have been contaminated by infiltrating nitrate. Nitrate content of one of the largest spring (19L/s) now varies from 50 to 60 mg/L. To specify the sources of nitrate pollution and collect sufficient data for the prediction of possible future development, flow dynamics, chemical and isotopic composition (δ¹⁸O in water, δ¹⁵N in nitrate) were monitored in the spring and precipitation together with potential sources of pollution (fertilizers, solutes in soil profile). Observed data were modelled by a simple mixing cell model to specify system parameters (volume and mean residence time). (author)

[en] Molecular characterisation of eight sugarcane mutants which tolerate 1% NaCl, was performed by means of restriction fragment length polymorphism (RFLP) analysis at the genomic level, using a group of molecular probes for ribosomal DNAs and two others, Δ-pyrroline-5-carboxylate reductase (ΔP5CR) and ATPase, probably related to salinity stress tolerance. Results showed the molecular evidence of genetic changes in comparison to the susceptible donor variety and the possible presence of more that one mechanism to tolerate salt stress. (author)

[en] Pot and field experiments assessed N₂ fixation by Albizia lebbeck and Acacia auriculiformis and contributions from prunings to yields of corn and hibiscus. Nitrogen fixation in these tree legumes was poor, with less than 50% N derived from fixation (%Ndfa) when grown in pots, but higher (>70%) in field conditions, after inoculation with compatible Bradyrhizobium strains. Prunings from A. lebbeck, as green manure improved growth of maize and hibiscus, inducing greater corn-kernel yields than did urea. Acacia auriculiformis prunings were similarly beneficial when mixed with leaves of A. lebbeck or L. leucocephala. Application of slow- and fast-nutrient-releasing leaves is required to maximize their contributions to crop productivity. (author)

[en] A recently developed local-density current functional formalism for confined Bose-condensed superfluids requires visco-elastic spectra which are defined through a finite-frequency extension of the dissipative coefficients entering the linearized hydrodynamic equations of the two-fluid model. We evaluate these spectra for a superfluid with contact interactions in the collisionless regime at finite temperature, by working to first order beyond the Bogolubov approximation. We find that within this approximation all the visco-elastic spectra take the same value apart from simple multiplicative factors. (author)

[en] We show that the Yang-Baxter equation is equivalent to the associativity of the algebra generated by non-commuting link operators. Starting from these link operators we build out the (FFZ) algebras, the slq(2) is derived by considering a special combination of the generators of (FFZ) algebra. (author)

[en] The first quantized theory of N=2, D=3 massive superparticles with arbitrary fixed central charge and (half) integer or fractional superspin is constructed. The quantum states are realized on the fields carrying a finite dimensional, or a unitary infinite dimensional representation of the super groups OSp(2 vertical-bar 2) or SU(1, 1 vertical-bar 2). The construction originates from quantization of a classical model of the superparticle we suggest. The physical phase space of the classical superparticle is embedded in a symplectic superspace T*(R^1,2) x L^{1vertical-bar} 2, where the inner Kaehler supermanifold L^{1vertical-bar} 2 ≅ OSp(2 vertical-bar 2/[U(1) x U(1)] ≅ SU (1, 1 vertical-bar 2)/[U(2 vertical-bar 2 x U(1)] provides the particle with super-spin degrees of freedom. We find the relationship between Hamiltonian generators of the global Poincare supersymmetry and the 'internal' SU(1, 1 vertical-bar 2) one. Quantization of the superparticle Combines the Berezin quantization on L^{1vertical-bar} 2 and the conventional Dirac quantization with respect to space-time degrees of freedom. Surprisingly, to retain the supersymmetry, quantum corrections are required for the classical N=2 supercharges as compared to the conventional Berezin method. These corrections are derived and the Berezin correspondence principle for L^{1vertical-bar} 2 underlying their origin is verified. The model admits a smooth contraction to the N=1 supersymmetry in the BPS limit. (author)

[en] Methods and set-up for measurements of trace level content of fissionable nuclides based on the delayed neutron counting technique are presented. It is shown that the electrostatic accelerator based method using the ⁹Be(d,n)¹⁰B reaction as a neutron source allows to determine the content of fissionable nuclides in ultra trace level (nano gram). New method for the determination of isotopic content of the sample is proposed. This method is based on the new systematics of the average half life of delayed neutron precursors for different fissioning systems. (author)

[en] The report describes the design and status of the pulsed neutron source based on a 100 MeV electron linac at KAERI, and the plans for the photonuclear data evaluation, together with some preliminary results

[en] The IAEA Nuclear Data Section provides convenient, cost-free access to the world's most comprehensive collection of numerical nuclear physics data. These nuclear data libraries result from a worldwide cooperation of nuclear data centres coordinated by the IAEA. An introduction is given to the various nuclear data types and libraries with particular emphasis to online services via the Internet. This paper summarizes a presentation for the IAEA Workshop on ''Nuclear Reaction Data and Nuclear Reactors: Physics, Design and Safety'' held at ICTP Trieste, Italy, 23 February - 17 March 1998. (author)