There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

计量经济分析 = Econometric analysis

This chapter discusses leading problems linked to energy that the world is now confronting and to propose some ideas concerning possible solutions. Oil deserves special attention among all energy sources. Since the beginning of 1981, it has merely been continuing and enhancing the downward movement in consumption and prices caused by excessive rises, especially for light crudes such as those from Africa, and the slowing down of worldwide economic growth. Densely-populated oil-producing countries need to produce to live, to pay for their food and their equipment. If the economic growth of the industrialized countries were to be 4%, even if investment in the rational use of energy were pushed to the limit and the development of nonpetroleum energy sources were also pursued actively, it would be extremely difficult to prevent a sharp rise in prices. It is evident that it is absolutely necessary to pursue actively the development of coal, natural gas, and nuclear power if a physical shortage of energy is not to block economic growth.

World energy outlook

Introduction to stochastic programming

Precise transformer fault diagnosis via random forest model enhanced by synthetic minority over-sampling technique

Reliable operation of the switchgear is essential for delivery of electric power to the end users. Poor connections and insulation degradation are the two major causes of arc-flash in the switchgear. This paper evaluates the non-intrusive measurement and performance of thermal ionization detector (TID) in the low voltage (LV) air insulated switchgear. The sensitivity analysis of the sensor is done in comparison with thermocouples. Experimental investigation is performed in a climate controlled chamber where bus bars having poor joints are installed. Useful deductions based on measured results, have been discussed in this paper. This particular type of study is nonexistent in the literature. So, it will be remarkably helpful for the researcher and engineers working in the online condition monitoring area.

Matti Lehtonen

Papers

Precise transformer fault diagnosis via random forest model enhanced by synthetic minority over-sampling technique

Thermal monitoring of low voltage switchgear using thermal ionization detector

Propagation Characteristics of Partial discharge Signals in Medium Voltage Branched Cable Joints using HFCT Sensor

A comparison of different signal processing techniques for travelling wave fault location

Measured faults in an unearthed medium voltage network