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Author : William R. Gill,Glen E. Vanden Berg
Publisher : Unknown
Page : 524 pages
File Size : 51,7 Mb
Release : 1967
Category : Electronic books
ISBN : UIUC:30112019253662
Author : E. McKyes
Publisher : Elsevier
Page : 226 pages
File Size : 41,7 Mb
Release : 1985-10-01
Category : Technology & Engineering
ISBN : 9780444601049
After giving a brief history of tillage practices and implements used throughout the world dating back to ancient times, this book goes on to describe the basic soil mechanics techniques needed to calculate the forces developed in soil by simple-shaped cutting tools. The methods of measuring soil mechanical properties, water pressure in soil and shear rate effects are touched upon. A review is given of two and three dimensional soil cutting mathematical mechanics models to predict soil cutting forces and soil volumes disturbed by cutting and tillage tools, as well as the state-of-the-art of soil loosening, structural rearrangement and plant growth as affected by tillage tools. The author also includes an introduction to the analysis of traction machines. There are many numerical examples of mechanical analyses and predictions worked out in the various sections of the book as well as numerous unsolved problems at the end of a number of the chapters. Written in a textbook style, this monograph is ideal for anyone wanting to learn modern techniques for the mechanical description of soil cutting and tillage forces and soil volumes disturbed. It also provides a reference for analytical formulae and calculated force forces. It will be of interest to universities and colleges worldwide which have Agricultural Engineering Programs, Civil and Mechanical Engineering schools which specialize in soil mechanics and construction machinery as well as to research stations worldwide with interests in soil tillage, soil physics etc.
Author : W.E. Larson,G.R. Blake,R.R. Allmaras,W.B. Voorhees,S.C. Gupta
Publisher : Springer Science & Business Media
Page : 272 pages
File Size : 48,7 Mb
Release : 2012-12-06
Category : Nature
ISBN : 9789400924215
Agricultural soils are subjected to many applied mechanical stresses that influence their behavior. Stresses arise from tillage machines, seeders and chemicals applicators, tractors, and equipment for harvest and transport. Applied stresses may compact or loosen the bulk soil. Micro sections of soil (aggregates or clods) may be compacted during tillage while the bulk soil is loosened. Because most granular soils are combined into structural units of varying sizes with different strengths and properties, prediction of the effect of stresses on the behavior of bulk soils is difficult. The basic strength properties of soil are determined by many fac tors: the size distribution of particles, chemical and mineralogical properties of inorganic clay fraction, the organic matter content and composition, the water content and the stress history. These factors combine and interact to produce many possible behavior patterns. Changes in structure of the soil from applied stresses and biologi cal reactions may profoundly influence storage and transmission of water, heat, and air, and the mechanical resistance to penetration by plant roots. They may also affect the traction of vehicles. Manipulation of structural properties of soils by tillage implements is a major cost under most crop production systems. Reduced energy use is also a significant conservation objective. Improved management systems are very dependent upon a better understanding of soils' response to applied stresses. The content of this book resulted from a NATO Advanced Research Workshop held in St. Paul, Minnesota, U.S.A. September 13-16, 1988.
Author : Anonim
Publisher : Unknown
Page : 490 pages
File Size : 48,8 Mb
Release : 2009
Category : Soil dynamics
ISBN : OCLC:436109677
Author : Anonim
Publisher : Unknown
Page : 524 pages
File Size : 47,8 Mb
Release : 1949
Category : Agriculture
ISBN : MINN:30000010140493
Set includes revised editions of some issues.
Author : Frank Freese,Jeanne Marie Davis,Pryce Byrd Gibson,Raymond T. Parkhurst,William R. Gill,Eugene Amos Hollowell,Glen E. Vanden Berg
Publisher : Unknown
Page : 1326 pages
File Size : 55,7 Mb
Release : 1966
Category : Aerial photography
ISBN : UIUC:30112019248365
Author : Dennis R. Heldman,Carmen I. Moraru
Publisher : CRC Press
Page : 2120 pages
File Size : 54,6 Mb
Release : 2010-10-21
Category : Science
ISBN : 9781498711074
The Definitive Reference for Food Scientists & EngineersThe Second Edition of the Encyclopedia of Agricultural, Food, and Biological Engineering focuses on the processes used to produce raw agricultural materials and convert the raw materials into consumer products for distribution. It provides an improved understanding of the processes used in
Author : United States. Great Lakes Basin Commission
Publisher : Unknown
Page : 452 pages
File Size : 42,7 Mb
Release : 1969
Category : Great Lakes (North America)
ISBN : UCR:31210020532329
Author : Vincent A. Dodd,Patrick M. Grace
Publisher : CRC Press
Page : 690 pages
File Size : 54,6 Mb
Release : 1989-01-01
Category : Technology & Engineering
ISBN : 9061919789
This set of proceedings volumes provides a broad coverage of basic and applied research projects dealing with the application of engineering principles to both food production and processing. The set consists of the following four volumes: Land and water use, Agricultural buildings, Agricultural mechanisation and Power, processing and systems. Includes about 450 papers from over 50 countries worldwide, drawn from the Eleventh International Congress on Agricultural Engineering, Dublin, 4-8 September 1989.
Author : Northwest Regional Educational Laboratory,Northwest Regional Educational Laboratory, Portland, Or
Publisher : Unknown
Page : 140 pages
File Size : 54,5 Mb
Release : 1971
Category : Agriculture
ISBN : MINN:30000010607780
Author : Northwest Regional Educational Laboratory
Publisher : Unknown
Page : 810 pages
File Size : 42,7 Mb
Release : 1970
Category : Vocational education
ISBN : CORNELL:31924014487353
Author : E. McKyes
Publisher : Elsevier
Page : 305 pages
File Size : 52,6 Mb
Release : 2012-12-02
Category : Technology & Engineering
ISBN : 9780444601018
This book provides an introduction to classical soil mechanics and foundation engineering, and applies these principles to agricultural engineering situations. Theoretical design formulae are given, plus tables and graphs dealing with bearing capacity factors, wall pressure factors, soil cutting numbers and soil mechanical properties. Many example problems of design and analysis are solved in the text, and there are unsolved problems given for each chapter. The text begins with descriptions of soil origins and classification systems, including agricultural classification schemes, and then introduces classical concepts of soil strength and strength measurement techniques in the laboratory and in the field. Soil mechanics is applied to the design of shallow foundations, and the design formulae as well as tables of bearing capacity factors for design use are provided. New research and design findings in the specialized area of tall and heavy farm silos are also given, in addition to deep pile foundation design for heavy structures on very soft soils. Water flow in soils is treated, together with stability of ditch bank slopes and small earth dams, design of retaining walls and pressure pressures in bins and silos, soil erosion and protection methods, soil cutting and tillage design methods, soil compaction analysis, the use of geotextiles and problems of soil freezing. The book is directed primarily at professional university students in Agricultural Engineering, but will also be of interest to scientists working in other engineering branches, landscape architecture, soil physics and the like.
Author : Oklahoma. State Department of Vocational and Technical Education. Curriculum and Instructional Materials Center
Publisher : Unknown
Page : 112 pages
File Size : 42,5 Mb
Release : 1974
Category : Teaching
ISBN : STANFORD:36105219364705
Author : A. J. Koolen,H. Kuipers
Publisher : Springer Science & Business Media
Page : 252 pages
File Size : 42,7 Mb
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9783642690105
Compared with forces occurring in soil mechanics problems in civil engineering, the forces that are applied to soil in farming operations generally have a short duration, less than a few seconds, a small loaded area, no more than a few square decimeters, and small intensities, 10 bar being a high value. On the other hand, soil properties vary widely between those of a weak mud and a stone-like dry soil. Tillage and related applications of force to soil are practiced worldwide in farming. Tillage operations are performed on one hectare of land for every three human beings. This means that for the food production for each individual daily, something like one cubic meter of soil is stirred, or about 20 times his body weight. Theoretical knowledge of this most common human activity, which largely determines the surface shape of the fertile part of the earth, is still very limited. In this book the authors have tried to give an outline of the present state of the art. One of the starting points was a course in soil dynamics taught by the authors at the Agricultural University at Wageningen, The Netherlands. We hope to reach interested readers who have no more theoretical knowledge than high school level, as well as readers who want to go beyond the level of a third year university student. For the chapter on wheels and tires we received substantial support from F. G. J. Tijink of the Tillage Laboratory at Wageningen.
Author : Anonim
Publisher : Unknown
Page : 778 pages
File Size : 46,8 Mb
Release : 1993
Category : Administrative agencies
ISBN : UOM:39015028198409