Toshihiko Emi's Books

Tundish Technology for Clean Steel Production

By: Yogeshwar Sahai (Ph. D.),Toshihiko Emi

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Tundish Technology for Clean Steel Production

By: Yogeshwar Sahai (Ph. D.),Toshihiko Emi

Continuous casting of steel has become a widely used process and an important step in steel production. The worldwide share of continuously cast steel has increased significantly in the last 25 years or so. However, concurrent with this increase in production levels are stringent quality requirements that have become crucial in the face of progressively increasing machine throughputs and larger product dimensions. As a result, steel cleanliness and strict composition control are now the primary concern of steelmakers.The tundish is the last metallurgical vessel through which molten metal flows before solidifying in the continuous casting mold. During the transfer of metal through the tundish, molten steel interacts with refractories, slag, and the atmosphere. Thus, the proper design and operation of a tundish are important for delivering steel of strict composition and quality. This pioneering book is the first of its kind to cover all aspects of tundish technology, ranging from fundamental aspects and theory necessary for understanding the basic concepts of tundish operations to operational aspects of the tundish. Written by internationally recognized experts in continuous casting technology in general and tundish technology in particular, this book is sufficiently fundamental to serve as a graduate-level textbook on process metallurgy or as an important reference for metallurgical researchers; at the same time, it is comprehensive enough to contribute to the understanding of scientists and engineers engaged in research and development in the steel industry.

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Page Count

329

Publisher

World Scientific

Published Date

ISBN 10

9812706216

ISBN 13

9789812706218

An Essay on the Principle of Sustainable Population

By: Toshihiko Hara

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An Essay on the Principle of Sustainable Population

By: Toshihiko Hara

This book focuses on the future of the global population and proposes revising Malthus’ Law. The United Nations estimates that the global population will top 11 billion by 2100, at which point its growth will be near an end: it will find a new ‎equilibrium in a long demographic transition from high birth and death rates to low ones. However, the author reviews the fertility developments reported in the World Population Prospects 2017, which are near or below the replacement level in most regions, with the important exception of Sub-Saharan Africa, and warns of a possible scenario of the extinction of human society. Returning to Malthus, his Essay on the Principle of Population is critically reconsidered. Simple simulations show that exponential growth and decay are unsustainable beyond the narrow ranges of the net reproduction rate. In addition, the length of reproduction periods, which depends on women’s lifespans, plays a pivotal role. The limits of growth are given in any case, to the extent that time and space will permit. From this perspective, teleological conditions such as instinct, passion, or even natural reproductive tendencies are irrelevant and unnecessary. When the population deviates too far from the replacement level, either its shrinking or massive growth will overshoot the limits of its existence. This principle of sustainable population indicates that the demographic transition must follow a logistic curve. Using a system dynamics approach, the author constructs a simulation model based on four major loops: fertility, reproduction timing, social capital accumulation, and lifespan. Using only endogenous variables, this model successfully reproduces the historical process of the demographic transition in Japan. Thereby, it shows that the timing and periods of reproduction, maximum fertility, and maximum lifespan hold the key to sustainability. Based on these findings, the author subsequently discusses recovering replacement fertility, extending lifespans, and the demographic future of the human race.

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Page Count

118

Publisher

Springer Nature

Published Date

ISBN 10

9811336547

ISBN 13

9789811336546

Tundish Technology for Clean Steel Production

By: Yogeshwar Sahai (Ph. D.),Toshihiko Emi

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Tundish Technology for Clean Steel Production

By: Yogeshwar Sahai (Ph. D.),Toshihiko Emi

Average ratings

N/A

Write a review

Solve jigsaw puzzle

Age

Page Count

329

Publisher

World Scientific

Published Date

ISBN 10

9812706216

ISBN 13

9789812706218

Book's by Toshihiko Emi

Tundish Technology for Clean Steel Production

Tundish Technology for Clean Steel Production

An Essay on the Principle of Sustainable Population

An Essay on the Principle of Sustainable Population

Tundish Technology for Clean Steel Production

Tundish Technology for Clean Steel Production

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