The contribution of fluorine chemistry to the field of clean chemical technology is reviewed. The roles of fluorochemicals in the environment and the ways in which they may be involved in inherently ‘greener’ processes are discussed.
By means of Monte-Carlo experiments the loss of efficiency of the main error components’ Nike Air Max Thea Black
models estimators is analysed if from a panel data base those individuals are dropped for which the observations are complete. An empirical risk function has been estimated. This can help to measure the risk of the use of complete sub-panels instead of the original but incomplete ones.
Six procedures for generating monthly flows of ephemeral streams are discussed and applied to eight Australian rivers. Based on the results the method of fragments is recommended although several other procedures yielded satisfactory results. Procedures examined included that of Beard, three variations of the log-normal distribution, the two-tier model and the method of Chaussure Air Max Bebe
A wine tasting study is used to illustrate how carry-over effects can occur in a sensory experiment with factorial treatments. Appropriate methods of design, randomization and analysis are given, with emphasis on practical considerations. References are given from the statistical literature on the construction of change-over designs.