[en] The inelastic slow neutron scattering of YBa₂Cu₃O_x compounds was investigated for superconduction (x = 6.95) and non-superconduction (x = 6.4) condition. The generalized function of density of states was received. The changes in vibration spectra depending on oxygen concentration were analyzed. Comparison with results have been received earlier was carried out. High frequency vibration at energy ε ≅ 176 MeV the nature of which is not clear was found

No abstract available

No abstract available

[en] The document contains two parts. Part I stipulates the agreement of the Government of Republic of Estonia to accept safeguards on all source or special fissionable material in all peaceful nuclear activities within its territory, under its jurisdiction or carried out under its control anywhere, for the exclusive purpose of verifying that such material is not diverted to nuclear weapons or other nuclear explosive devices. Part II specifies the procedures to be applied in the implementation of the safeguards provisions of Part I. The Agreement was approved by the Agency's Board of Governors on 24 February 1992, signed in Vienna on 18 November 1997 and in Tallinn on 24 November 1997, and entered into force on 24 November 1997

[en] The penetration of ¹⁴C-glyphosate was studied in Cyperus rotundus with three nonionic surfactants. Among the three surfactants Synperonic A20 was more effective than A2 and A7 in enhancing penetration of glyphosate 24 hours after treatment both in dry and wet seasons. The addition of diesel oil to Synperonic A20 further increased penetration of glyphosate in both seasons. (author)

[en] Nuclear generating capacity in the UK is static with no units currently under construction. All the Magnox reactors previously belonging to Nuclear Electric plc and Scottish Nuclear Limited have been retained in a new publicly-owned company, Magnox Electric plc, which is currently planned to be merged with British Nu- clear Fuels (BNFL). The AGRs and the UK's only PWR, Sizewell B, are operated by Nuclear Electric Limited (NE) and Scottish Nuclear Limited (SN) who are subsidiaries of British Energy plc (BE) which was privatised in July 1996. Prompt reprocessing of all Magnox fuel will continue. NE has recently signed a contract covering the lifetime arisings of AGR fuel which allows for both reprocessing and long term storage as required. Taken with SN's contracts signed in 1995 this means that all AGR spent fuel will now be sent to Sellafield for reprocessing or storage. Spent PWR fuel will continue to be stored at the reactor site

[en] Insecticide wastes generated from livestock dipping operations are well suited for biodegradation processes since these wastes are concentrated, contained, and have no other significant toxic components. About 400,000 L of cattle dip wastes containing approximately 1500 mg/L of the organophosphate coumaphos are generated yearly along the Mexican border from a USDA program designed to control disease carrying cattle ticks. Use of unlined evaporation pits for the disposal of these wastes has resulted in highly contaminated soils underlying these sites. Previous work has shown that microbial consortia present in selected dip wastes can be induced to mineralize coumaphos. Our laboratory results show that these consortia are able to colonize plastic fibers in trickling biofilters and can be used in these filters to quickly metabolize coumaphos from dip wastes. A field scale biofilter capable of treating 15,000 litre batches of dip waste was used to reduce the coumaphos concentration in two successive 11,000 litre batch trials from 2000 mg/L to 10 mg/L in approximately 14 d. (author)

[en] On the view point the most important for the HTGR development promotion now in Japan is to have people know about HTGR, the Research Association of HTGR Plants(RAHP) has paid the best efforts for making an appealing report for the past two years. The outline of the report is described with an introduction of some basic experiments done on the passive decay heat removal as one of the activities carried out in a member of the association. (author)

[en] The present situation of nuclear power in general and of the innovative nuclear reactor systems in particular requires more comprehensive, coordinated R and D efforts on a broad international level to respond to today's requirements with respect to public and economic acceptance as well as to globalization trends and global environmental problems. HTGR technology development has already reached a high degree of maturity that will be complemented by the operation of the two new test reactors in Japan and China, representing technological milestones for the demonstration of HTGR safety characteristics and Nuclear Process Heat generation capabilities. It is proposed by the IAEA 'International Working Group on Gas-Cooled Reactors' to establish a 'Global HTGR R and D Network' on basic HTGR technology for the stable, long-term advancement of the specific HTGR features and as a basis for the future market introduction of this innovative reactor system. The background and the motivation for this approach are illustrated, as well as first proposals on the main objectives, the structure and the further procedures for the implementation of such a multinational working sharing R and D network. Modern telecooperation methods are foreseen as an interactive tool for effective communication and collaboration on a global scale. (author)

[en] As part of the activities within the framework of the development of INCOGEN, a ''Dutch'' conceptual design of a small HTR, the ECN reactor physics code system has been extended with the capability to perform combined neutronics and thermal hydraulics steady-state, burnup and transient core calculations on pebble-bed type HTRS, by joining the general purpose reactor code PANTHER and the HTR thermal hydraulics code THERMIX/DIREKT in the PANTHERMIX code combination. The validation of the ECN code system for HTR applications is still in progress, but some promising first calculation results on unit cell and whole core geometries are presented, which indicate that the extended ECN code system is quite suitable for performing the pebble-bed HTR core calculations, required in the INCOGEN core design and optimization process. (author)