Search

Market liberalisation has resulted in significant changes not only in the way electricity is traded, but also for the market participants themselves. The bidding behaviour of market participants who are active in a liberalised UK-like market has been modelled. Both operational and technical parameters associated with the market and its participants are accounted for. Explicit characterization of risk (value at risk) is made with respect to market participants and their attitude to trading. Profit maximization strategies for market participants are then developed based on the minimization of price-risk under uncertainty. Results are presented for a selected case study and the effect of alternative strategies is compared. The case study concerns several generators who need to determine what proportion of their production they should sell to the market. The results show that based on cost and price forecasts there is scope for generators to profitably take advantage of both contractual and within-day market trades. [ABSTRACT FROM AUTHOR]

Uncertainty concerning the configuration of dienestrol was resolved by a detailed spectrochemical investigation, including single-crystal X-ray diffraction, of the active drug and its stereoisomers. A symmetric structure in which the phenyl and methyl groups are cisabout each double bond is unambiguously assigned.

In 1963 some pest-control operators in Texas experienced failures in controlling German cockroaches, Blattella germanica (L.), with insecticides that had previously given satisfactory control. Five strains from 3 locations were tested in the laboratory and compared with a normal strain for determination of level of resistance. At LC50 the times resistances were: to diazinon 2.5–6.3; to fenthion 2.7–5.0; and to malathion 2.2–12.8. At LC90 the values were: to diazinon 2.9–8.2; to fenthion 3.2–9.9; and to malathion 1.9–26.7.