Download or read book Experimental Determination of Diffusion Coefficients of Soils written by Dipak Jayantilal Shah and published by . This book was released on 1981 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Soil Science written by Ward Chesworth and published by Springer Science & Business Media. This book was released on 2007-11-22 with total page 859 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Soil Science provides a comprehensive, alphabetical treatment of basic soil science in a single volume. It constitutes a wide ranging and authorative collection of some 160 academic articles covering the salient aspects of soil physics, chemistry, biology, fertility, technology, genesis, morphology, classification and geomorphology. With increased usage of soil for world food production, building materials, and waste repositories, demand has grown for a better global understanding of soil and its processes. longer articles by leading authorities from around the world are supplemented by some 430 definitions of common terms in soil sciences.
Download or read book Experimental Determination of Diffusion Coefficients in Binary Gaseous Systems written by Soong Yang and published by . This book was released on 1968 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Measurement of the Diffusion Rates of Volatile Organic Compounds Through Laboratory prepared and Intact Soils written by Paul Milne and published by . This book was released on 1996 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Diffusion Coefficient for Unsaturated Soils written by Eeshani Sood and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The structures constructed on unsaturated soils are damaged by the movement of the soil underneath. The movement is basically due to the flow of moisture in and out of the soil. This change in moisture also affects the strength of the soil, thus resulting in failure of slopes of embankments constructed with these soils. Therefore, it is very important to study the diffusion properties of unsaturated soils. Study of the diffusion properties requires the determination of the diffusion coefficient ([alpha]). In this thesis improvements in the drying test, originally proposed by Mitchell(1979), have been discussed. The study also involves defining the evaporation coefficient(h[subscript]e) which has been ill-defined in previous research work. The flow through unsaturated soils is non-linear but due to the complexity involved it has been simplified to a linear problem. The nonlinear behavior has been studied during this research. Therefore, certain refinements have been applied in the determination of the diffusion coefficient. The laboratory procedure followed involves measuring the soil suction along the length of the sample and at different times using thermocouple psychrometers. The evaluation of the evaporation coefficient (h[subscript]e) has been made an integral part of the procedure. The diffusion coefficient is determined using the curve fitting procedure of Aubeny and Lytton, 2003.
Download or read book Influence of Soil on Detection of Buried Explosives and Tunnels by Trace Gas Analysis written by and published by . This book was released on 1971 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mathematics of Diffusion written by John Crank and published by Oxford University Press. This book was released on 1979 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.
Download or read book Determination of Diffusion Coefficient Through Laboratory Tests and Analytically Validating it Using Empirical Relations for Unsaturated Soils written by Anshuman B. Thakur and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil suction is one of the most important physical variables affecting the soil engineering behavior, moisture content. Suction has a major controlling influence on soil shear strength. The moisture diffusivity properties of unsaturated properties of soils exert a critical influence on the depth to which seasonal variations of moisture and suction at the ground surface extend into the soil mass. Hence, a study of moisture diffusion coefficient is pivotal. In this research the drying test originally proposed by Mitchell (1979) has been validated by back calculating the moisture diffusion values using the empirical relation established by Lytton (2003). The non-linear flow through unsaturated soils has been simplified to a linear problem for simplicity in this study. Owing to this simplification, certain refinements have therefore been applied in the determination of diffusion coefficient. Thermocouple psychrometer was used to measure the soil suction along the length of the sample and at different times in the laboratory. Initial suction measurements were done using the filter paper test. Curve fitting procedure established by (Aubeny and Lytton, 2003), has been used for the determination of the diffusion coefficient. Analytical validation of the moisture diffusion coefficient, required coefficient of permeability, 'k', slope of suction water characteristic curve 'S' and air entry value 'h0' as the major input parameters. Mitchell (1979) assumed the value of 'h0' to be 100 cm. In this research air entry value, 'h0' has been re-evaluated and it comes out to be higher than the pre estimated value. The value of slope of suction water characteristic curve, 'S' obtained from pressure plate tests, compares well to the empirical equation of Lytton (2003). The results of moisture diffusion coefficient obtained from the empirical equation come out in the same range as obtained from the refined Mitchell's (1979) drying test. The refinements includes introduction of constant temperature environment. Owing to the least variation in temperature, more reliable and reproducible data was obtained. The range of moisture diffusion coefficient, [alpha]-values obtained from empirical equation, comes out to be coherent with the laboratory data. Hence, it can be concluded that the research was successful.
Download or read book The Measurement of Soil Gas Diffusion Coefficients and Their Effect on the Direct Measurement of Denitrification written by Paul Douglas Brooks and published by . This book was released on 1978 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods of Soil Analysis Part 4 written by Jacob H. Dane and published by John Wiley & Sons. This book was released on 2020-05-27 with total page 1744 pages. Available in PDF, EPUB and Kindle. Book excerpt: The best single reference for both the theory and practice of soil physical measurements, Methods, Part 4 adopts a more hierarchical approach to allow readers to easily find their specific topic or measurement of interest. As such it is divided into eight main chapters on soil sampling and statistics, the solid, solution, and gas phases, soil heat, solute transport, multi-fluid flow, and erosion. More than 100 world experts contribute detailed sections.
Download or read book Field Measurement of Denitrification written by Dennis E. Rolston and published by . This book was released on 1977 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Experimental Determination of Solubilities written by G. T. Hefter and published by John Wiley & Sons. This book was released on 2003-08-01 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Guidelines are provided on the reliability of various methods, as well as information for selecting the appropriate technique. * Unique coverage of the whole range of solubility measurements. * Very useful for investigators interested in embarking upon solubility measurements.
Download or read book Experimental Apparatus and Methodology for Quantifying and Modeling the Effective Soil Gas Diffusion Coefficient in Heterogeneous Soil Matrices written by John P. Kline and published by . This book was released on 1995 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water resources Investigations Report written by and published by . This book was released on 1991 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Diffusion Coefficients in a Steady State Experiment written by Thomas Michael Fekete and published by . This book was released on 1969 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement and Modeling of Solute Diffusion Coefficients in Unsaturated Soils written by Hsin-Yi Chou and published by . This book was released on 2010 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although solute diffusion in soil has been widely examined under the influence of both soil-water content and matric potential, little information is available about the impact of soil-water content/matric potential hysteresis on solute diffusion. Our research shows that the unequal soil-water content at a given matric potential when a soil is subjected to drying or wetting process has substantial impact on solute diffusion. The measured solute diffusion coefficients of drying were greater than those of wetting in certain soil-water content range. When fitted the solute diffusion coefficients of drying and wetting limbs by proposed predictive models, the drying limb is better described by a power function of soil-water content with empirical constants estimated by particle-size distribution and bulk density; while the wetting limb is better described by a conceptual model which assumes the solute diffusive pathway is comprised of the serial arrangement of pore water and film water. This research concluded that the behavior of solute diffusion in unsaturated soils is essentially determined by the liquid phase distribution.
Download or read book EPA 600 9 written by and published by . This book was released on 1979-08 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
