Key Technique of Gas Sucking of "Three-Soft" Coal Bed and Its Application
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The Evolution of Plants
A major new undergraduate textbook on plant evoution This is a broad but provocative examination of the evolution of plants from the earliest forms of life to the development of our present flora. Taking a fresh, modern approach to a subject often treated very stuffily, the book incorporates many recent studies on the morphological evolution of plants, enlivens the subject with current research on ancient D.N.A. and other biomolecular markers, and places plant evolution in the context of climate change and mass extinction. It is written to be accessible to undergraduates, so, for example, geological time is discussed in terms of 'millions of years ago' as well as by the names of the ages, and English equivalents of plant names are prefered, e.g. seed plants (instead of gymnosperms), flowering plants (instead of angiosperms). * Links up the trends/patterns seen in the fossil flora from the earliest green algae through to the present day. * Covers the whole geological timescale, but focuses the chapters on periods when major evolutionary changes occurred. * Special Biome Maps indicate the general trends in changing global plant distribution through time.
Research on Geological Structure Mark of Coal and Gas Outbursts in Pingdingshan Mining Area
Based on the study of regional displaying rules of coal and gas outburst controlled by geological structure in Pingdingshan mining area, the geological structure features in outburst sites were investigated emphatically. The combination type, orientation and least seam thickness in outburst sites were put forward. This research provides a geological mark for forecasting gas outbursts in deep mining.