[en] Advantages in using INIS data base are described. They open the ways to analyze development of nuclear science and technology in different fields, to find main directions of research, to evaluate their development in particular countries

No abstract available

[en] Industrial petroleum and gas content of Kumkol deposit is determined. It dated to Lower Neocomian and Upper Jurassic terrigenous stage sediments. It is determined, that its lithologic characteristics are very different. That is explained by various condition of sedimentation. (author)

[en] Price patterns for the future are likely to be similar to the recent past when changes ranged from down to nearly $1.00 per million BTu to more than $3.00. (Author)

[en] Short communication

[en] Potential implications of a number of uncertainties currently affecting the world oil market are assessed. The influence of the interplay of geopolitical events on demand and supply, inventories, prices and price trends are reviewed. Reference prices which industry and governments can use for investment and policy evaluations are provided. In this volume, the emphasis is on near term developments, with a review of the uncertainties surrounding these projections. Three different scenarios are postulated for the near term, each one taking into account different levels of Iraqi exports during the period which would effect available inventories, and hence price. Depending on which of the three scenarios actually comes to pass, unless refiners are prepared to build up inventories well beyond seasonal norms, or producers shut in, the prevailing view is that oil prices will be under severe pressure during most of 1998 and 1999. Over the longer term, however, the analysis suggests that an average real value of US$18.00 - $18.50 per barrel remains a reasonable expectation as a sustainable price. 34 refs., tabs., figs

[en] No abstract available. Paper not delivered in time

[en] We demonstrate stable single mode operation in a pulsed Ti:sapphire laser oscillator with novel grazing incidence four-mirror (GIFM) coupled cavity. This cavity consists of a grating, a gain medium, and four mirrors and, therefore, has four-arm interferometer configuration. Through the interferometric effect, we could suppress the adjacent modes and obtain stable single mode operation with a bandwidth of <200 MHz. We also have developed the general analysis of the laser modes and threshold conditions for this configuration and the experimental results were agreed well with the theoretical predictions.

[en] Predictions of solar radiation for 17 stations in south-east and north-east Nigeria have been made using only the maximum air temperature and relative humidity. Both yearly and seasonal estimates have been considered. For yearly estimates, the maximum percentage error MPE is about 2% for a majority of the 17 stations and does not exceed 5.4% for any station. The average absolute percentage error AAPE and the sum of percentage errors SPE are less than 1.8% and 0.7%, respectively, while the coefficient of determination R² > 0.967 for all stations. For seasonal estimates, MPE < 0.3%, SPE < 0.006% while R² ⩾ 0.9997 for all seasons and all stations. (author)

[en] In order to establish a technical concept for the detection of defects in weldments in thin steel plate, an experimental and theoretical investigation was carried out for artificial defects in a steel plate having a thickness of 2.4mm by using the guided wave technique. In particular the goal was to find the most effective testing parameters paying attention to the relationship between the excitation frequency by a tone burst system and various incident angles. It was found that the test conditions that worked best was for a frequency of 840kHz and an incident angle of 30 or 85 degrees, most of the defects were detected with these conditions. Also, it was clear that a guided wave mode generated under an incident angle of 30 degrees was a symmetric mode, So, and that of 85 degrees corresponded to an antisymmetric mode, Ao. By using the two modes, most of all of the defects could be detected. Furthermore, it was shown that the antisymmetric mode was more sensitive to defects near the surface than the symmetric mode. Theoretical predictions confirmed this sensitivity improvement with Ao for surface defects because of wave structure variation and energy concentration near the surface