Log in

Relevant bibliographies by topics / Soils, Salts in – Mathematical models / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Soils, Salts in – Mathematical models.

Dissertations / Theses on the topic 'Soils, Salts in – Mathematical models'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 37 dissertations / theses for your research on the topic 'Soils, Salts in – Mathematical models.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Hagi-Bishow, Mohamed. "Assessment of LEACHM-C model for semi-arid saline irrigation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/MQ44178.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Ahmad, Faheem. "Numerical modelling of transport of pollutant through soils." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08182009-040239/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Richard, Paul François. "A computer analysis of the flow of water and nutrients in agricultural soils as affected by subsurface drainage." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29171.

Full text

Abstract:

A computer model was developed in order to determine the effects of drainage practices on nutrient losses from level agricultural soils. The model performs a daily simulation of the vertical flow of water, nitrogen, phosphorus, and heat, and of the growth of crops. A water flow submodel calculates the depth of the water table based on daily predictions of evaporation, transpiration, flow to drains and ditches, and deep percolation. An original saturated-unsaturated flow algorithm is used to determine moisture infiltration, redistribution, and upward flow in the soil matrix, as well as bypassi

APA, Harvard, Vancouver, ISO, and other styles

4

Galadima, A., and J. C. Silvertooth. "Mathematical Models of Potassium Release Kinetics for Sonoran Desert Soils of Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/210381.

Full text

Abstract:

The objective of this study was to determine the potassium (K) release kinetics of clay samples from 10 agricultural representative soils of Arizona by successive extraction using Ca-saturated cation resin. A 1993 physical and chemical characterization of the soils revealed that all soils contain smectite-mica K bearing minerals. Four mathematical models (power function, Elovich, parabolic diffusion and first-order) were used to describe the nonexchangeable K release reaction involving 700-hr cumulative reaction time. Comparison of the models using the coefficient of determination (r²) and the

APA, Harvard, Vancouver, ISO, and other styles

5

Dang, Hoang Kien 1981. "The application of a multilaminate model to simulate tunnelling in structured clays : a dissertation." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99755.

Full text

Abstract:

Due to the complex characteristics of tunneling problems, tunneling engineering is perhaps one of the areas in which numerical methods are more frequently adopted in practice. One important application is to examine the influence of an excavation and construction procedures on the stress distribution and deformation in the ground surrounding the opening and on the tunnel lining. Another important aspect of tunneling problems that can be accounted for in a numerical analysis is the complex geometry associated with typical applications. This is not only related to the shape of the opening, but a

APA, Harvard, Vancouver, ISO, and other styles

6

SOMASUNDARAM, SUJITHAN. "CONSTITUTIVE MODELLING FOR ANISOTROPIC HARDENING BEHAVIOR WITH APPLICATIONS TO COHESIONLESS SOILS (INDUCED, KINEMATIC, NON-ASSOCIATIVENESS)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/188165.

Full text

Abstract:

A constitutive model based on rate-independent elastoplasticity concepts is developed to simulate the behavior of geologic materials under arbitrary three-dimensional stress paths, stress reversals and cyclic loading. The model accounts for the various factors such as friction, stress path, stress history, induced anisotropy and initial anisotropy that influence the behavior of geologic materials. A hierarchical approach is adapted whereby models of progressively increasing sophistication are developed from a basic isotropic-hardening associative model. The influence of the above factors is ca

APA, Harvard, Vancouver, ISO, and other styles

7

PERES, ANA C. "Modelo para o estabelecimento de valores orientadores para elementos radioativos no solo." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11591.

Full text

Abstract:

Made available in DSpace on 2014-10-09T12:53:36Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:08:08Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

APA, Harvard, Vancouver, ISO, and other styles

8

王偉洪 and Wai-hung Wong. "A study of constitutive models on engineering properties of Hong Kong marine clay." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31214745.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Uchaipichat, Anuchit Civil &amp Environmental Engineering Faculty of Engineering UNSW. "Experimental investigation and constitutive modelling of thermo-hydro-mechanical coupling in unsaturated soils." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/22068.

Full text

Abstract:

A thermo-elastic-plastic model for unsaturated soils has been presented based on the effective stress principle considering the thermo-mechanical and suction coupling effects. The thermo-elastic-plastic constitutive equations for stress-strain relations of the solid skeleton and changes in fluid content and entropy for unsaturated soils have been established. A plasticity model is derived from energy considerations. The model derived covers both associative and non-associative flow behaviours and the modified Cam-Clay is considered as a special case. All model coefficients are identified in te

APA, Harvard, Vancouver, ISO, and other styles

10

Taillon, Kate. "Modeling surface complexation relationships in forest and agricultural soil." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82435.

Full text

Abstract:

The adsorption behaviour of trace metals in soil may provide us with a way to more accurately predict and assess the toxicity of metals in the environment. This thesis reports efforts to apply surface complexation modeling to agricultural and forest soil and to relate model parameters to common soil properties. This study considered Ca, Cd, Cu, Pb and Zn but the methods here could be applied to other metals. In Chapter 2, the surface charge and adsorption behaviour of a set of Ap horizons was characterised using back-titration and batch adsorption techniques. With the objective of simpl

APA, Harvard, Vancouver, ISO, and other styles

11

Hunt, Andrew Robert. "Numerical simulation of hydrothermal salt separation process and analysis and cost estimating of shipboard liquid waste disposal." Thesis, Cambridge Massachusetts Institute of Technology, 2007. http://hdl.handle.net/10945/2986.

Full text

Abstract:

CIVINS<br>Due to environmental regulations, waste water disposal for US Navy ships has become a requirement which impacts both operations and the US Navy's budget. In 2006, the cost for waste water disposal Navy-wide was 54 million dollars. There are many advanced waste water treatment technologies in the research and development stage at academic institutions, private corporations, and government labs. Additionally, considerable progress has been made in installing and operating unique waste water treatment systems onboard merchant and commercial vessels, showing that waste water treatment

APA, Harvard, Vancouver, ISO, and other styles

12

Odeh, Inakwu Ominyi Akots. "Soil pattern recognition in a South Australian subcatchment /." Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09pho23.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

To, Chiu-yin, and 杜昭彥. "A unified elasto-plastic model for saturated loosely compacted completely decomposed granite." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40203554.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Jain, S. K. "Analysis of the pressuremeter test by FEM formulation of the elasto-plastic consolidation." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53881.

Full text

Abstract:

A decade has passed since the development of the self-boring pressuremeter (SBPM). Even though the device has been recognized by the geotechnical engineering profession as having high promise for evaluating in-situ stress-strain behavior of soils, its use is limited. In large part, this is due to the fact that there are important unanswered questions about the SBPM test. One of the major issues concerns the influence of drainage in the soil as it is sheared. In clays, the test is assumed to be undrained, but there is no way to control this other than by the rate of loading and no method has be

APA, Harvard, Vancouver, ISO, and other styles

15

Abou, Nahra Joumana. "Modeling phosphorus transport in soil and water." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102946.

Full text

Abstract:

The main objective of this project was to investigate and model phosphorus (P) transport in soil column studies. A model named HYDRUS-NICA was developed, by coupling a hydrological and transport model (HYDRUS-1D model) with an aqueous chemical model (non-ideal competitive adsorption - NICA), to improve the predictions of P transport in soil and water. The HYDRUS-NICA model was developed by replacing the non-linear empirical (Freundlich and Langmuir) equations of the HYDRUS-1D model with the NICA model equations. The numerical accuracy of the HYDRUS-NICA model was then evaluated by comparing th

APA, Harvard, Vancouver, ISO, and other styles

16

Manivannan, Ganeshalingam Aerospace Civil &amp Mechanical Engineering Australian Defence Force Academy UNSW. "Viscoplastic modelling of embankments on soft soils." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2005. http://handle.unsw.edu.au/1959.4/38743.

Full text

Abstract:

A major instrumented geosynthetic reinforced approach embankment was constructed to 5.5 m elevation above ground, with prefabricated vertical drains, over a soft compressible clay deposit at Leneghan, Newcastle, Australia in May 1995. The field monitoring of settlements for over six years shows that the embankment manifests significant creep. The instrumentation, field performance and the finite element analyses for predicting the long-term performance of this embankment are described in this thesis. The maximum settlement of 1.1 m was observed one year after the completion of construction. H

APA, Harvard, Vancouver, ISO, and other styles

17

Cobban, Dale Anne. "Evaluation of three simple hydrosalinity models applied to citrus orchards in the Lower Coerney River irrigation area, Eastern Cape, South Africa." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005504.

Full text

Abstract:

Three hydrosalinity models of different complexity were evaluated against data from selected citrus orchards in the Lower Coerney River irrigation area. These models were statistically compared with field data, and found to vary in accuracy of output predictions. The simplest model, the LEACHING REQUIREMENT (LR) model, has the lowest data input requirements and produces output predictions that correlate with up to 93% of the variance in measured data. SODICS, which is theoretically more detailed and requires a greater level of detail in input, produces predictions of an accuracy equivalent to

APA, Harvard, Vancouver, ISO, and other styles

18

Rahman, Md Mizanur Engineering &amp Information Technology Australian Defence Force Academy UNSW. "Modelling the influence of fines on liquefaction behaviour." Publisher:University of New South Wales - Australian Defence Force Academy. Engineering & Information Technology, 2009. http://handle.unsw.edu.au/1959.4/43920.

Full text

Abstract:

Traditionally, void ratio, e has been used as a state variable for predicting the liquefaction behaviour of soils under the Critical State (Steady State) framework. Recent publications show that void ratio, e may not be a good parameter for characterizing sand with fines as the steady state, SS data points move downward in e-log(p) space up to certain fines content termed as threshold fines content, TFC. Thus, it was difficult to apply SS concept on sand with fines as a small variation of fines content may lead to different SS line. Many researchers proposed to used equivalent granular void r

APA, Harvard, Vancouver, ISO, and other styles

19

Knecht, Billberger Magnus F. "Plant growth - stoichiometry and competition : theory development in ecosystem ecology /." Uppsala : Dept. of Ecology and Environmental Research, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200624.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Evans, T. Matthew. "Microscale Physical and Numerical Investigations of Shear Banding in Granular Soils." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7576.

Full text

Abstract:

Under loading conditions found in many geotechnical structures, it is common to observe failure in zones of high localized strain called shear bands. Existing models predict these localizations, but provide little insight into the micromechanics within the shear bands. This research captures the variation in microstructure inside and outside of shear bands that were formed in laboratory plane strain and two-dimensional discrete element method (DEM) biaxial compression experiments. Plane strain compression tests were conducted on dry specimens of Ottawa 20-30 sand to calibrate the device, as

APA, Harvard, Vancouver, ISO, and other styles

21

Nosse, Ariana Trevizan. "Modelagem termodinâmica da pressão osmótica de soluções protéicas por meio de equações volumétricas de estado." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-12062013-144931/.

Full text

Abstract:

A pressão osmótica é uma das principais propriedades de interesse no estudo da não-idealidade de soluções proteicas, por fornecer diretamente informações sobre a atividade do solvente e, indiretamente, sobre o comportamento da proteína em solução. O presente trabalho objetiva a investigação do uso de equações osmóticas de estado para o cálculo da pressão osmótica em soluções proteicas contendo co-solventes como sais e polímeros. O modelo desenvolvido compreende um termo de esferas rígidas de Carnahan-Starling e um termo atrativo de van der Waals. Para avaliar a adequação do modelo proposto, co

APA, Harvard, Vancouver, ISO, and other styles

22

Morand, Hugues. "The economic potential of the Quebec cropping sector to sequester carbon in agricultural soils /." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80335.

Full text

Abstract:

This research simulates the response of the Quebec cropping sector to the introduction of carbon credit revenue which could be made available through the implementation of a greenhouse gas emissions trading and offset system in Canada. Eligible carbon sequestering practices investigated in the simulations include adoption of moderate tillage and no-till as well as the conversion to a permanent cover crop. Monetary demand for greenhouse gas emissions offsets from the cropping sector is endogenized in the objective function of the Canadian Regional Agriculture Model (CRAM) which has been

APA, Harvard, Vancouver, ISO, and other styles

23

Segarra, Eduardo. "A dynamic analysis of the crop productivity impacts of soil erosion: an application to the Piedmont area of Virginia." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/51930.

Full text

Abstract:

This study was born out of the desire to analyze the complex soil management problem faced by individual economic agents as well as society. The focus of this study, however, was on the theoretical formulation and estimation of partial equilibrium dynamic economic models directed toward optimizing the private use of the soil resource. In particular, four empirical representative farm models were formulated. Solutions to the four representative farm models showed that sizable reductions in topsoil loss, which contributes to non-point source pollution, and aggravates the crop productivity impac

APA, Harvard, Vancouver, ISO, and other styles

24

Franklin, Oskar. "Plant and forest dynamics in response to nitrogen availability /." Uppsala : Swedish University of Agricultural Sciences, 2003. http://diss-epsilon.slu.se/archive/00000345/.

Full text

Abstract:

Thesis (doctoral)--Swedish University of Agricultural Sciences, 2003.<br>Appendix consists of reprints of three papers and a manuscript, three of which are co-authored with others. Includes bibliographical references. Also partially issued electronically via World Wide Web in PDF format; online version lacks appendix.

APA, Harvard, Vancouver, ISO, and other styles

25

Galdino, Sérgio. "Estimativa da perda de terra sob pastagens cultivadas em solos arenosos da bacia hidrográfica do alto Taquari - MS/MT." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256830.

Full text

Abstract:

Orientadores: Mara de Andrade Marinho, Edson Eiji Matsura<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola<br>Made available in DSpace on 2018-08-20T22:57:38Z (GMT). No. of bitstreams: 1 Galdino_Sergio_D.pdf: 11328709 bytes, checksum: e5e5fc6d26b74b20826ad8a8bc4a4cef (MD5) Previous issue date: 2012<br>Resumo: O assoreamento do rio Taquari constitui grave problema ambiental e socioeconômico do Pantanal Brasileiro e decorre principalmente da erosão acelerada do solo ocupado com pastagens degradadas na parte alta da bacia. Um dos modelos mais utilizado p

APA, Harvard, Vancouver, ISO, and other styles

26

Muthineni, Srinivas. "Two Dimensional Numerical Modelling Of Variably Saturated Flows." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/255.

Full text

Abstract:

The prediction of moisture and contaminant transport through unsaturated soil to ground water is becoming increasingly important in the fields of hydrology, agriculture and environmental engineering. Computer aided simulation techniques enables one to conduct a series of systematic numerical experiments to analyze flow phenomenon in subsurface hydrology under various physical and chemical processes. The flow movement depends upon medium characteristics, initial and boundary conditions, which reflect, physical processes occurring below the ground. To understand the effects of physical process a

APA, Harvard, Vancouver, ISO, and other styles

27

Wei, Jiangfeng. "Land-atmosphere interaction and climate variability." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-05162007-151312/.

Full text

Abstract:

Thesis (Ph. D.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2008.<br>Stieglitz, Marc, Committee Member ; Guillas, Serge, Committee Member ; Fu, Rong, Committee Member ; Curry, Judith, Committee Member ; Dickinson, Robert, Committee Chair.

APA, Harvard, Vancouver, ISO, and other styles

28

Al-Taher, Mohamad A. "Geostatistical applications to salinity mapping and simulated reclamation." Thesis, 1991. http://hdl.handle.net/1957/36881.

Full text

Abstract:

Geostatistical methods were used to find efficient and accurate means for salinity assessment using regionalized random variables and limited sampling. The random variables selected, sodium absorption ratio (SAR), electrical conductivity (EC), and clay content were measured on samples taken over an area of fifteen square miles. Ordinary kriging and co-kriging were used as linear estimators. They were compared on the basis of average kriging variance and sum of squares for error between observed and estimated values. The results indicate a significant improvement in the average kriging variance

APA, Harvard, Vancouver, ISO, and other styles

29

Rockhold, Mark L. "Interactions between microbial dynamics and transport processes in soils." Thesis, 2002. http://hdl.handle.net/1957/31485.

Full text

Abstract:

An experimental and numerical modeling investigation was conducted to study interactions between microbial dynamics and transport processes in variably saturated porous media. These interactions are important in a variety of applied problems such as water and wastewater treatment, bioremediation, and oil-field recovery operations. These processes and interactions also have great ecological significance, with global scale implications for carbon cycling in the environment and the related issue of climate change. Experiments were conducted under variably saturated flow conditions in columns and

APA, Harvard, Vancouver, ISO, and other styles

30

Burns, Erick R. "Thermodynamics of non-dilute saline solutions in variably saturated porous media." Thesis, 2004. http://hdl.handle.net/1957/29363.

Full text

Abstract:

Non-dilute salt strength solutions occur in many near surface geologic environments. In order to better understand the occurrence and movement of the water and salt, mathematical models for this non-ideal fluid need to be developed. Initial boundary value problems may then be solved to predict behavior for comparison with observations. Using the principles of equilibrium reversible and irreversible thermodynamics, relationships describing the thermo-physics of non-dilute saline solutions in variably saturated porous media are investigated. Each of four central chapters investigates a particula

APA, Harvard, Vancouver, ISO, and other styles

31

Chase-Dunn, Corinna. "Soil mottling as an indicator of seasonal high water table in Massachusetts floodplain soils /." 1991. https://scholarworks.umass.edu/theses/3520.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Salem, Salloum Berghooth. "Data reduction methods for field estimated hydraulic properties." 1986. http://hdl.handle.net/2097/22146.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Leusen, Frank J. J. "Crystal Structure Prediction of Diastereomeric Salts: A Step toward Rationalization of Racemate Resolution." 2003. http://hdl.handle.net/10454/3555.

Full text

Abstract:

No<br>Crystal structure prediction simulations were carried out to explore the solid state packing alternatives of two diastereomeric salts consisting of a chlorine-substituted cyclic phosphoric acid and the two enantiomers of ephedrine. The experimentally observed crystal structures were correctly simulated with an error of a few kcal/mol. This represents a significant achievement in crystal structure prediction due to the complexity of the mathematical search problem at hand (two distinct molecules in the asymmetric unit, one of which is flexible) and due to the complex energetics of these o

APA, Harvard, Vancouver, ISO, and other styles

34

Dent, Mark Clifford. "Crop water requirements for irrigation planning in South Africa." Thesis, 1988. http://hdl.handle.net/10413/9604.

Full text

Abstract:

Irrigation in 1980 accounted for approximately 52 per cent of the water consumed in Southern Africa. The need for planning water resources in the agricultural sector is therefore apparent. Much of Southern Africa's arable farming is carried out on land which, in terms of soil moisture availability to crops, can be described as marginal. Information on soil moisture is therefore valuable to the agriculturalist for planning irrigation schemes and for dryland farming. The objectives of this study were to provide the information mentioned above. This was achieved by producing a detailed delimitati

APA, Harvard, Vancouver, ISO, and other styles

35

Brock, Terry A. "A comparison of deterministic and probabilistic radiation dose assessments at three fictitious ��Cs contaminated sites in California, Colorado, and Florida." Thesis, 1997. http://hdl.handle.net/1957/34111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Sane, Akshay Gajanan. "High-fidelity modelling of a bulldozer using an explicit multibody dynamics finite element code with integrated discrete element method." Thesis, 2015. http://hdl.handle.net/1805/6441.

Full text

Abstract:

Indiana University-Purdue University Indianapolis (IUPUI)<br>In this thesis, an explicit time integration code which integrates multibody dynamics and the discrete element method is used for modelling the excavation and moving operation of cohesive soft soil (such as mud and snow) by bulldozers. A soft cohesive soil material model (that includes normal and tangential inter-particle force models) is used that can account for soil compressibility, plasticity, fracture, friction, viscosity and gain in cohesive strength due to compression. In addition, a time relaxation sub-model for the soi

APA, Harvard, Vancouver, ISO, and other styles

37

Fisher, Katelin Rose. "Nitrous oxide emission from riparian buffers in agricultural landscapes of Indiana." Thesis, 2014. http://hdl.handle.net/1805/4028.

Full text

Abstract:

Indiana University-Purdue University Indianapolis (IUPUI)<br>Riparian buffers have well documented capacity to remove nitrate (NO3-) from runoff and subsurface flow paths, but information on field-scale N2O emission from these buffers is lacking. This study monitored N2O fluxes at two agricultural riparian buffers in the White River watershed (Indiana) from December 2009 to May 2011 to assess the impact of landscape and hydrogeomorphologic factors on emission. Soil chemical and biochemical properties were measured and environmental variables (soil temperature and moisture) were monitored in an

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!