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Full-Text Articles in Life Sciences
The Total Surface Of Some Soils As Related To Permeability And Water Retention Characteristics, Warren W. Rasmussen
The Total Surface Of Some Soils As Related To Permeability And Water Retention Characteristics, Warren W. Rasmussen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
It is generally recognized that many of the chemical and physical properties of soils are dependent upon the surface activity of the finer soil fractions. The importance of the magnitude of the surface areas to such properties as base exchange, water-holding capacity, absorption of gases, and the plasticity of soils has been demonstrated. Attempts have been made to determine or estimate the surface of soils and soil fractions by various methods and to relate the values obtained to the physical and chemical characteristics exhibited by these materials. Most determinations have been based on calculations of surface area from mechanical analysis …
The Influence Of Temperature Gradients On Soil Moisture Flow, Luigi Cavassa
The Influence Of Temperature Gradients On Soil Moisture Flow, Luigi Cavassa
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The isothermal movement of liquid water in saturated soil has been intensively studied, and a sound theoretical basis has been developed. Considerably less is known about the flow of water in unsaturated soils, but a general theory based on Darcy's law of flow is beginning to develop. A good theoretical basis exists for the vapor diffusion under isothermal conditions. Inconsistent data and theories are found in the literature concerning the movement of water in both the vapor and liquid phases, under the influence of thermal fields.