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

Alueellisen sähkönkulutusanalyysin ja -ennusteprosessin toiminnallinen kuvaus

Comparison of Operating Modes of Air-Core Inductive Sensors for Partial Discharge On-line Diagnostics in Medium Voltage Networks

In the municipality of Helsinki, plans to expand its subtransmission network in the next few years predict excessive high short-circuit levels in numerous substations. The existing network embodies overhead lines (OHL) and underground cables (UGC), in many occasions assembled in parallel, as well as combined heat and power (CHP) facilities. Furthermore, it is characterized by meshed topology, which ensures system flexibility and improved reliability; however, this configuration favors propagation of fault currents and voltage sags across the grid. To minimize damage from these, the present study investigates prospective fault current limitation techniques, including the superconducting fault current limiter (SFCL), regarding the features of the Helsinki subtransmission network. This paper inspects the optimal location of these solutions and performs economic assessment. Moreover, it examines the benefits of the employed techniques, assesses whether they achieve the desired operational performance, and quantifies total costs, accrediting load growth for a 40-year period.

Evaluation of fault current limitation techniques in urban meshed 110-kV subtransmission networks

Three measuring points for partial discharge location in energized covered-conductor overhead distribution lines

This paper proposes an indirect load control demand response (DR) strategy for residential houses. A Stackelberg game theory is applied to account for the interaction between the aggregator in one side and the consumers on the other side. The aggregator, which owns a wind power plant, strives to maximize wind power utilization by consumers. Therefore, it motivates the consumers to adjust their load demand according to the forecasted wind power production by offering a bonus to them. On the other hand, consumers attempt to achieve the highest amount of reward by changing their load profile. It is assumed that each consumer has a critical load of which they have no control, and also a flexible load such as heat, ventilation and air conditioning (HVAC) system which can regulate its demand while keeping the temperature in a specified band. In this way, the consumers’ comfort level is entirely maintained. In addition, for the sake of considering the uncertainty, several scenarios for wind and also consumers’ demand are considered in this work.

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Matti Lehtonen

Papers

Alueellisen sähkönkulutusanalyysin ja -ennusteprosessin toiminnallinen kuvaus

Comparison of Operating Modes of Air-Core Inductive Sensors for Partial Discharge On-line Diagnostics in Medium Voltage Networks

Evaluation of fault current limitation techniques in urban meshed 110-kV subtransmission networks

Three measuring points for partial discharge location in energized covered-conductor overhead distribution lines

A Game Theory Approach for Maximum Utilization of Wind Power by DR in Residential Consumers