Undiscovered Petroleum and Mineral Resources

Undiscovered Petroleum and Mineral Resources

Author: Lawrence J. Drew

Publisher: Springer Science & Business Media

Published: 1997-02-28

Total Pages: 228

ISBN-13: 9780306455247

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This book is a guide to the management and use of formulated feeds in semi-intensive and intensive fish and shrimp culture. Feeds represent the major variable operating costs in intensive aquaculture, and optimizing their use represents an opportunity for many farmers to increase or maintain the profitability of their enterprise. Fish farmers have an ever widening range of feed types and feeding methods from which to choose, and must carefully monitor the use of feeds in order to control costs. This book includes details of those biological, environmental, and nutritional factors which influence the feeding, growth and survival of fish and shrimp, and of which some understanding is essential in the establishment of effective feeding practices. Details are given of feed handling and storage methods, and the various methods available for feeding fish are described and their relative methods appraised. Methods for selection of the appropriate feed types, ration sizes, and feeding schedules are included, and details given of how to measure performance of feeding programs. Throughout the text reference is made to key areas of current research, and examples are drawn from different sectors of the industry to illustrate the general principles of feed management.


Geosciences and Human Survival, Environment, Natural Hazards, Global Change

Geosciences and Human Survival, Environment, Natural Hazards, Global Change

Author: Zhang Zonghu

Publisher: CRC Press

Published: 2023-03-08

Total Pages: 373

ISBN-13: 1466564334

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The proceedings of the 30th International Geological Congress held in Beijing, China in August 1997. These two volumes focuses on geosciences and human survival, environment, natural hazards and global changes. They aim to present a view of contemporary geology.


Critical Mineral Resources of the United States

Critical Mineral Resources of the United States

Author: K. J. Schulz

Publisher: Geological Survey

Published: 2017

Total Pages: 868

ISBN-13: 9781411339910

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As the importance and dependence of specific mineral commodities increase, so does concern about their supply. The United States is currently 100 percent reliant on foreign sources for 20 mineral commodities and imports the majority of its supply of more than 50 mineral commodities. Mineral commodities that have important uses and face potential supply disruption are critical to American economic and national security. However, a mineral commodity's importance and the nature of its supply chain can change with time; a mineral commodity that may not have been considered critical 25 years ago may be critical today, and one considered critical today may not be so in the future. The U.S. Geological Survey has produced this volume to describe a select group of mineral commodities currently critical to our economy and security. For each mineral commodity covered, the authors provide a comprehensive look at (1) the commodity's use; (2) the geology and global distribution of the mineral deposit types that account for the present and possible future supply of the commodity; (3) the current status of production, reserves, and resources in the United States and globally; and (4) environmental considerations related to the commodity's production from different types of mineral deposits. The volume describes U.S. critical mineral resources in a global context, for no country can be self-sufficient for all its mineral commodity needs, and the United States will always rely on global mineral commodity supply chains. This volume provides the scientific understanding of critical mineral resources required for informed decisionmaking by those responsible for ensuring that the United States has a secure and sustainable supply of mineral commodities.