Дисертації з теми "MINRES method"
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Freitag, Melina. "Inner-outer iterative methods for eigenvalue problems : convergence and preconditioning." Thesis, University of Bath, 2007. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512248.
Повний текст джерелаPranjal, Pranjal. "Optimal iterative solvers for linear systems with stochastic PDE origins : balanced black-box stopping tests." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/optimal-iterative-solvers-for-linear-systems-with-stochastic-pde-origins-balanced-blackbox-stopping-tests(4fd0d668-3271-4615-9def-07fc9fe2ea9e).html.
Повний текст джерелаMASSON, MICHELE. "Etude par spectrometrie raman de films tres minces et d'interfaces." Paris 6, 1988. http://www.theses.fr/1988PA066405.
Повний текст джерелаBourouga, Brahim. "Etude d'une methode de mesure instationnaire de resistance thermique de contact entre parois cylindriques concentriques minces." Nantes, 1986. http://www.theses.fr/1986NANT2063.
Повний текст джерелаGriso, Georges. "Etudes asymptotiques de structures réticulées minces." Paris 6, 1995. http://www.theses.fr/1995PA066338.
Повний текст джерелаWestberg, Daniel. "A sensor fusion method for detection of surface laid land mines." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10479.
Повний текст джерелаLandminor är ett stort problem både under och efter krigstid. De metoder som används för att detektera minor har inte ändrats mycket sedan 1940-talet. Forskning med mål att utvärdera olika elektro-optiska sensorer och metoder som skulle kunna användas för att skapa mer effektiv min-detektion genomförs på FOI. Försök som har gjorts med data från bland annat laser-radar och IR-sensorer har gett intressanta resultat.
I det här examensarbetet utvärderades olika fenomen och egenskaper i laser-radar- och IR-data. De testade egenskaperna var intensitet, IR, ytlikhet och höjd.
En metod som segmenterar intressanta objekt och bakgrundsdata utformades och implementerades. Metoden använde sig av expectation-maximization-skattning och ett minimum message length-kriterium. Ett scatter separability-kriterium användes för att bestämma kvalitén på de olika egenskaperna och på den resulterande segmenteringen.
Data insamlad under en mätkampanj av FOI användes för att testa metoden. Resultatet visade bland annat att ytlikhetsmåttet gav en bra segmentering för stora objekt med släta ytor, men var sämre för små objekt med skrovliga ytor. Vid jämförelse med en manuellt skapad mål-mask visade det sig att metoden klarade av att välja ut egenskaper som i många fall gav en godkänd segmentering.
Land mines are a huge problem in conflict time and after. Methods used to detect mines have not changed much since the 1940's. Research aiming to evaluate output from different electro-optical sensors and develop methods for more efficient mine detection is performed at FOI. Early experiments with laser radar sensors show promising results, as do analysis of data from infrared sensors.
In this thesis, an evaluation is made of features found in laser radar- and in infrared -sensor data. The tested features are intensity, infrared, a surfaceness feature extracted from the laser radar data and height above an estimated ground plane.
A method for segmenting interesting objects from background data using theexpectation-maximization algorithm and a minimum message length criterion is designed and implemented. A scatter separability criterion is utilized to determine the quality of the features and the resulting segmentation.
The method is tested on real data from a field trial performed by FOI. The results show that the surfaceness feature supports the segmentation of larger object with smooth surfaces but gives no contribution to small object with irregular surfaces. The method produces a decent result of selecting contributing features for different neighbourhoods of a scene. A comparison with a manually created target mask of the neighbourhood and the segmented components show that in most cases a high percentage separation of mine data and background data is possible.
Attipou, Kodjo. "Étude des instabilités dans les membranes minces sous chargements thermomécaniques." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0207/document.
Повний текст джерелаWrinkling is an instability phenomenon generally observed in thin structures with membrane's behavior. Those thin structures have no rigidity to flexion and are therefore used in traction. In this thesis, we developed a reduction model's technique for the modeling of wrinkling phenomenon in thin membranes. This technique, based on the double scale Fourier series, allow us to deduce from a full membrane model, a reduced membrane model that is able to take into account the global and local instability of the structure. The critical load and critical wavelength are determined analytically on one side, then numerically on the other side. Numerical exemples are conducted to validate the numerical model towards the analytical one. Numerical models studied take into account both full and reduce membrane models. The full model is simulated in Abaqus and solved numerically using the arc length method and the reduced model is implemented in Matlab and solved numerically using the asymptotic numerical method. We studied the membrane behavior under mechanical, thermal and thermo-mechanical loading. The results obtained show that the full membrane model can be replaced by the reduced one in determining critical loads and corresponding wavelengths. The gain in computation time obtained is important, due to the coarse mesh required by the reduced model. The reduced model is very sensitive to membrane's boundaries conditions and requires to have a quasi constant wavelength along the membrane width
ROBERTS, MARK CULMER. "THEORY AND PRACTICE OF THE INTENSITY OF USE METHOD OF MINERAL CONSUMPTION FORECASTING (MINERAL, ECONOMICS)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187962.
Повний текст джерелаBretall, Damien Carl. "Inverse hybrid method for determining explosive loading on plates due to buried mines." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7814.
Повний текст джерелаThesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Nguyen, Thanh Trung. "Méthode PEEC inductive par élément de facette pour la modélisation des régions conductrices volumiques et minces." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT049/document.
Повний текст джерелаThe PEEC method is known as a good method for modeling electrical connections in the domains of powerelectronics and electrical engineering. It applies to a wide range of devices: printed circuits, bus-bars, solidconductors. It is particularly well adapted for modeling the wire type conductive regions. However, it is requireda structured mesh (discretization geometries quadrangles) and this approach is limited in frequency (high skindepth). Finally, it now seems difficult to envisage modeling of the volume conductors in standard PEECformulation.This thesis develops integrals formulations using facet elements to improve the above mentioned limitations ofthe standard PEEC method. It is in fact a generalization of the standard PEEC method by taking into accountunstructured meshes (volume and surface) and taking into account the notion of thin region with a small skindepth.The applications are the modeling of complex systems of conductors (non-simply connected regions) taking intoaccount the connections between regions (volume / wireframe, surface / wired volume / surface and surface /surface)
Fenneman, Douglas. "An acoustic method for the detection of surface waves in sand." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/21802.
Повний текст джерелаBody, Christophe. "Modélisation des couches minces magnétostrictives [Texte imprimé] : application aux microsystèmes." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0049.
Повний текст джерелаZhang, Yigong. "ACTIVE CURRENT INJECTION METHOD FOR LIMITING GROUND FAULT CURRENT HARMONICS IN UNDERGROUND COAL MINES." UKnowledge, 2014. http://uknowledge.uky.edu/mng_etds/15.
Повний текст джерелаFredriksson, Anna. "Mätvärdesbaserad metod för minskade emissioner i mindre förbränningsanläggningar." Thesis, Linnéuniversitetet, Institutionen för byggd miljö och energiteknik (BET), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45943.
Повний текст джерелаSchröder, Christoph T. "On the interaction of elastic waves with buried land mines : an investigation using the finite-difference time-domain method." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13928.
Повний текст джерелаSouag, Nadjia. "Influence de certains types de defauts sur la tenue dielectrique aux temps courts des couches minces de polymeres." Toulouse 3, 1987. http://www.theses.fr/1987TOU30138.
Повний текст джерелаROGER, JEAN-PAUL. "Contributions a l'etude des surfaces, interfaces et films minces par la methode mirage." Paris 6, 1988. http://www.theses.fr/1988PA066509.
Повний текст джерелаJulisson, Sarah. "Optimisation de formes de coques minces pour des géométries complexes." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV106/document.
Повний текст джерелаDuring the design process, optimizationof shapes offers manufacturers solutions for improvingproducts performances. In particular, thin shellstructures that represent about 70 % of a vehicle, area concern in the automotive industry. Most optimizationmethods for surface structures have limitationsand require expertise at every level of the optimizationprocedure.The aim of this thesis is to propose a new strategyfor the shape optimization of thin shell structures.The approach presented rely on using the Koiter’sshell model based on an isogeometric analysis. Thismethod allows for simulations on the exact geometryby defining the shape using CAD patches. Selectedoptimization variables are the control points used tocontrol the shape of the CAD patches. Variations ofthese points allows to scan a wide design space withfew parameters. The definition of patchs also enablesto find a gradient with respect to the shape for theoptimization by using the adjoint state method.This method was applied to mechanical criteria fromthe Renault design offices. Optimization results for acompliance criterion are presented. The definition andimplementation of vibro-acoustic criteria are discussedat the end of this thesis. The results demonstratethe interest of the method. However, many developmentswill be needed before being able to apply it inthe industry
Sun, Zhouming. "Reliability-based method for stability of mine entry design and evaluation." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1575.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains xi, 162 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 156-161).
Kostecki, Todd. "DESIGN METHODS FOR ROCK BOLTS USING IN-SITU MEASUREMENT FROM UNDERGROUND COAL MINES." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/dissertations/1695.
Повний текст джерелаMoulin, Stéphane. "Contribution à l'étude des mécanismes de nucléation et de croissance des couches minces de diamant par mesures in-situ." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10018.
Повний текст джерелаBouillaud, Pascal. "Irradiation aux ions lourds de films minces nanocristallins d'alliages FeCo et FeAl." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612171v.
Повний текст джерелаLuxbacher, Kramer Davis. "Time-lapse Passive Seismic Velocity Tomography of Longwall Coal Mines: A Comparison of Methods." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29018.
Повний текст джерелаPh. D.
Phillips, Kent Thomas. "Applications of Thermal and Laser-Based Methods for Monitoring Airborne Particulates in Coal Mines." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79386.
Повний текст джерелаMaster of Science
Peplow, Dan. "The influence of mine waste contamination on invertebrates and fish in the Methow River Valley, Okanogan County, Washington (U.S.A.) /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5519.
Повний текст джерелаAltamirano-Soto, Pablo, Jorge Supa-Urrutia, Humbero Pehovaz-Alvarez, Carlos Raymundo, Nestor Mamani-Macedo, and Francisco Dominguez. "Filling Method Implementing Hydraulic Lime for Reusing Mine Tailings and Improve Sustainability in Conventional Peruvian Underground Mines." Springer, 2020. http://hdl.handle.net/10757/656169.
Повний текст джерелаMining in Peru has existed for several decades, and for several years, there has been no proper environmental management of the impact of this activity on the environment and society in general, whether it be gas emissions, the presence of acidic water, or the generation of mining tailings. One of the most prominent examples involve mine tailings; these are by-products of mining processing plants and are stored in a dam known as a tailings dam. Like any extraction activity, mining generates large amounts of waste material that could become potential risks to the environment and society. Using hydraulic fills, the mine tailings contained in tailings dams could be reused. These fills seek to decrease the volume of stored tailings to prevent any future dam collapses, as observed in Brazil with the Vale mining company, where its tailings dam collapsed and caused more than 200 deaths.
Delpire, Norbert. "Contribution à l'automatisation de la procédure de préparation et d'étude en ultra-vide de couches minces d'alliages." Rouen, 1986. http://www.theses.fr/1986ROUES037.
Повний текст джерелаMonsalve, Juan J. "Integrating Laser Scanning with Discrete Element Modeling for Improving Safety in Underground Stone Mines." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90659.
Повний текст джерелаM.S.
According to the Mine Health and Safety Administration (MSHA), between 2006 and 2016, the underground stone mining industry had the highest fatality rate in 4 out of 10 years, compared to any other type of mining in the United States. Additionally, the National Institute for Occupational Safety and Health (NIOSH) stated that structurally controlled instability is one of the main causes of rock falls in underground limestone mines. This type of instability occurs when the fractures present in the rock mass intercept each other forming rock blocks that displace into the tunnel as the excavation takes place and poses a great hazard for miners. In recent years, Terrestrial laser scanning (TLS) has been used for mapping and characterizing fractures present in a rock mass. TLS is a technology that allows to generate a three-dimensional multimillion point cloud of a scanned area. In addition to this, the advances in computing power throughout the past years, have allowed simulation softwares such as the Discrete Element Model (DEM) to represent more realistically the behavior of a fractured rock mass under excavation. The aim of this work was to develop and evaluate a methodology that could complement already exisiting design guidelines that may not apply to all kind of underground mines. The presented methodology evaluates rock failure due to presence of discontinuites, through the integration of TLS with DEM and considers site specific conditions. An area of a case study mine was assessed with this methodology, where several laser scans were performed. Information extracted from this laser scans was used to simulate the response of the rock mass under excavation by running Discrete Element Numerical Models. Results from these models allowed us to estimate the probability of rock failure in the analized areas. These, rock block failure probability estimations provide engineers a tool for characterizing, preventing, and managing structurally controlled instability, and ultimately improving workers safety.
MORICHERE, DOMINIQUE. "Etude des proprietes electrooptiques de couches minces organiques par la methode de la reflexion totale attenuee." Paris 11, 1991. http://www.theses.fr/1991PA112118.
Повний текст джерелаMolavi, M. A. "A study of potash mining methods related to ground control criteria /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66262.
Повний текст джерелаZelaya-Reyes, Yadira, Luis Arauzo-Gallardo, Guillemo Diaz-Huaina, Carlos Raymundo, Nestor Mamani-Macedo, and Javier M. Moguerza. "Mathematical Model of a Drilling Mesh to Reduce Dilution in the Sublevel Stoping Method in Peru’s Underground Mines." Springer, 2020. http://hdl.handle.net/10757/656172.
Повний текст джерелаThis research study focuses on creating a drill pattern for the Condestable mine, which will allow us to assess the percentage of dilution. For these purposes, we used the Pearse formula proposed in 1955, which allowed us to find the burden and later, the spacing that each drill hole should have in the pattern. Once we had collected all the numerical data, we used the JK SimBlast program to design the proposed drill pattern and analyze the damage zones, the tonnage acquired and the existing dilution. According the results obtained, the smaller the hole diameter, the less dilution will be generated when diversifying the wall and ceiling explosives.
Osborne, Caudill. "A Comparison of the HGM Approach to the RBP Method of Evaluating Reconstructed Streams on Surface Coal Mines." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/176.
Повний текст джерелаJurin, Florian. "Croissance et propriétés de films minces conducteurs par auto-assemblage de polyélectrolytes." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2072/document.
Повний текст джерелаSelf-assembly of polymers has been studied in order to produce multilayer films having conductive properties. First, the influence of various physicochemical parameters (pH, ionic strength, nature and charge of ions, polymer concentrations, etc.) on the growth of insulating polymer (PSS or PDDA) / conductive polymers (PEDOT : PSS or P3HT-R) was studied by in-situ measurements of fixed-angle laser reflectometry. The understanding of its parameters allowed to control the assembly of the materials in order to obtain multilayer films with the desired properties (thickness, morphology, electrical conductivity...) The thicknesses of the films obtained were determined by ellipsometry or profilometry, morphology Of the surface morphology of these films was observed by SEM and their conductivity was measured by the method of van Pauw. Second, polymer multilayer films / composite particles were built after optimizing the conditions for the production of the composite particles Al2-PEDOT: PSSph or SiO2-P3HT-R). The multilayer films obtained have conductivities equivalent to those of Films are based on polymers but are constructed with fewer adsorption steps. Finally, multilayer layers based on two conductive polymers (P3HT-R and PEDOT: PSS) were built on flexible substrates. They have the highest conductivity measured (1.5 Sm-1) and retain their electrical properties when subjected to mechanical bending stresses, which is promising for their use in the field of deformable electronics
Ftouni, Hossein. "Transport thermique dans des membranes très minces de SiN amorphe." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00995424.
Повний текст джерелаBarrezueta-Delgado, Erika, Naysha Blas-Trujillo, Yaneth Vasquez-Olivera, Carlos Raymundo, Nestor Mamani-Macedo, and Javier M. Moguerza. "A Cyanide Tailings Management Method Using Pseudomonas Fluorescens to Improve Conventional Treatments for Progressive Closure at Small Gold Mines." Springer, 2020. http://hdl.handle.net/10757/656170.
Повний текст джерелаBased on the review of different research studies, we could assess that, due to their unique biological features, microbes, specifically bacteria, could be used to repair damaged soils with heavy metal and toxic compound contents. Furthermore, these microorganisms are metabolically capable to oxidize cyanide and its by-products to generate less-toxic compounds at the end of the process. This research proposal seeks to improve conventional mine closure designs, thus counteracting their negative short-term, medium-term, and long-term after-effects to the environment. The proposed technique as a solution, therefore, is microbial remediation, using pseudomonas fluorescens bacteria to oxidize this compound to non-toxic components. It will ensure operational continuity for the deposits and, in turn, the sustainability of the entire mining industry.
Puspitosari, Nastiti. "Density of states measurements on semiconductor and thin film materials using photocurrent methods." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS018/document.
Повний текст джерелаInvestigations on thin film materials dedicated to the solar industry are still a matter of interest with the growing numbers of material types incorporated as absorbers in a solar cell device. The need of characterization techniques is therefore acute for the optimization of materials and their incorporation in solar devices. In this thesis, a photocurrent method based on Fourier Transform Photocurrent Spectroscopy (FTPS) is used to perform the measurements of thin film materials and solar cells. Our FTPS was further developed to perform 3 types of measurements: 1.) reflection and transmission (R/T) measurement, 2.) absorption coefficient spectroscopy and 3.) spectral response, external quantum efficiency, and short circuit photocurrent density measurements. This latter is specifically used for solar cells. We used the R/T results to perform numerical simulations giving the thickness, refractive index, film roughness, and optical absorption coefficient. A modeling of the density of states (DOS) using the software DeOSt automated with the Teacher Learner Based Optimization (TLBO) algorithm was achieved to find the best suited DOS parameter values to reproduce the experimental spectrum of alpha. A sensitivity analysis was performed to find the most important DOS parameters among 15-17 parameters. For the experimental studies, we have measured several a-Si:H thin film samples prepared under different deposition conditions, and used their absorption coefficient; spectra to study their DOS. A comparison of absorption coefficient; measurements on a-Si:H thin films deposited on a glass substrate and incorporated in a solar cell device stack was also conducted. This study concluded that a correction of the absorption coefficient spectrum measured on solar cells had to be done
Wootton, Robert James Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Investigation into the feasibility and application of composite materials in conveyor support structures for use in underground coal mines." Awarded by:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/43697.
Повний текст джерелаTang, Xiaochao. "Numerical modeling of deformations caused by carbon dioxide sequestration in coal seams." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4809.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains viii, 83 p. : ill. (some col.), maps (part col.). Vita. Includes abstract. Includes bibliographical references (p. 74-78).
Le, Duc Tung. "Développement de méthodes intégrales de volume en électromagnétisme basse fréquence. Prise en compte des matériaux magnétiques et des régions minces conductrices dans la méthode PEEC." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENT052/document.
Повний текст джерелаThis thesis concerns the study of power electronic device modelling. These devices are often composed of conductors with heterogeneous geometric dimensions (plate where the thickness is much smaller than its width and / or length, for example) whose modelling is difficult. Because of the inadequacy of finis methods (finite element method, finite volume method) with these structures, the work has been directed to the integral method (PEEC method, magnetic moment method). This work consists in the introduction of magnetic and conductive regions in the PEEC method. Target applications are the modeling of complex conductors systems associated with ferromagnetic masses (e.g., core inductors) and shielding (casings of electrical cabinets, for example). This type of structure is widely found in the field of power electronics. In order to provide a complet modeling tools, many types of regions were processed: volume regions, thin regions and conductive and/or magnetic regions, with any skin thickness. Although not all types of regions have been treated and coupled with PEEC method, a lot of formulations have been implemented
Love, David. "Mine water geochemistry and management : two case studies and a new treatment method." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51829.
Повний текст джерелаENGLISH ABSTRACT: Mine water, that is all forms of water associated with and affected by mining operations is probably the largest area of concern in the environmental geology of mining. This study looks at the inter-relationship between mine water geochemistry and mine water management. The objectives of this study are: 1. To examine major geochemical processes influencing mine water; 2. To apply new national water and environmental legislation to the mining industry and discover how mine water management will be regulated; 3. To examine the approach of Integrated Catchment Management, and discover how this approach can be applied to the mining industry; 4. To conduct two case studies, where environmental geochemistry, general geochemistry and multivariate analyses are used as tools to investigate groundwater contamination problems in mining areas, and therefore suggest mine water management interventions; and 5. To, considering mine water problems discovered in the case studies, develop a newly-patented chemical treatment method for possible application in the mining industry. The changing legal framework - principally the implementation of the National Water Act (Act No 36 of 1998) and the National Environmental Management Act (Act No 107 of 1998) - is leading to the responsibilities of a mine becoming substantially clearer, and responsibilities which in the past could have been ignored until public outcry will now be difficult to escape. Two case studies are investigated. In both cases, general geochemistry and hydrogeochemistry, coupled with factor analysis are used to determine the major signatures in groundwater chemistry and the major sources of contamination. On the basis of this, management interventions are suggested. In the first case study, Sishen Iron Ore Mine of the Northern Cape, three signatures are identified in the groundwater: a clean dolomitic water signature, and a contamination signature from the mine and one from agriculture. The extent of nitrate and diesel contamination is shown to be related to agriculture, the use of explosives and to mine workshops and depots. Surface water controls may help reduce these problems. In the second case study, West Driefontein Gold Mine of the Far West Rand, two signatures are identified in the groundwater: a clean dolomitic water signature and a signature relating to contamination from the mine. Cluster analysis is used to suggest three groundwater zones, the chemistry of one being fairly clean dolomitic aquifer, the chemistry of the second affected by the mine and the chemistry of the third affected by granites. Contamination is shown to be related to mining operations, especially the slimes dams, and agriculture. Rehabilitation of dams and dumps, as well as surface water controls may help reduce these problems. Considering mine water problems discovered in the case studies, a newly-patented chemical treatment method is examined and tested for possible application in the mining industry. It is shown to be extremely effective for the removal of calcium from water, but less effective for the removal of iron and manganese. More broadly, this study shows the inter-dependence between mine water geochemistry and mine water management, and the need to be multi-disciplinary in approach.
AFRIKAANSE OPSOMMING: Mynwater, dit is aile soorte water wat geaffekteer en geassosieer word met mynbou bedrywighede, is moontlik die grootste rede tot kommer in omgewingsgeologie van mynbou. Hierdie studie stel ondersoek in na die verhouding tussen mynwater geochemie en mynwater bestuur. Die doelwitte van die studie is soos volg: 1. Om die hoof geochemiese prosesse te ondersoek wat mynwater beinvloed: 2. Om die nuwe nasionale water- en omgewingswette toe te pas op die mynboubedryf en te ondersoek hoe die bestuur van mynwater gereguleer sal word; 3. Om die benadering van Gerntegreerde Opvangs Bestuur ("Integrated Catchment Managemement") te ondersoek, en te ondersoek hoe hierdie benadering op die mynbou industrie toegepas kan word' 4. Om twee gevallestudies te doen, waar omgewingsgeochemie, algemene geochemie en multivariant analise gebruik word as middels om grondwater besoedeling in mynbougebiede te ondersoek, en daarvolgens om mynwater bestuurswysigings voor te stel; en 5. Om, nemende in ag die mynwater probleme wat ontdek is in die gevallestudies, 'n nuutgepatenteerde chemiese behandelingsmetode, vir moontlike toepassing in die mynbou industrie, te ontwikkel. Die veranderende regtelike raamwerk - hoofsaaklik die implementering van die Nasionale Waterwet (Wet No. 36 van 1998) en die Nasionale Omgewingsbestuur Wet (Wet No.1 07 van 1998) - lei daartoe dat 'n myn verantwoordelik moet wees om opmerklik skoner te word, verantwoordelikhede wat in die verlede maklik gergnoreer kon word maar wat nou te moeilik is om te ignoreer as gevolg van publieke uitroepe. Twee gevalle is ondersoek. In be ide studies word algemene geochemie en hidrogechemie, saam met faktoranalise, gebruik om die hoof kenmerke te bepaal in grondwaterchemie en die hoof bronne van besoedeling. Deur dit as basis te gebruik word bestuurswysigings voorgestel. In die eerste gevallestudie, Sishen Ystererts Myn in die Noordkaap, is drie kenmerkende samestellings qeidentitiseer in die grondwater: 'n skoon dolomitiese samestelling, en een elk van 'n myn en landbou gekontamineerde samestelling. Die omvang van nitraat en diesel kontaminasie word aangedui as geassosieerd met landbou, die gebruik van plofstowwe, mynwerkswinkels en depots. Oppervlak waterbeheer mag help om hierdie probleme te beheer. In die tweede gevallestudie, Wes Driefontein Goudmyn in die Ver Wesrand, is twee kenmerkende samestellings in die grondwater gerdentifiseer: 'n skoon dolomitiese samestelling en 'n samestelling geassosieer met kontaminasie van die myn. "Cluster" analise is gebruik om drie grondwatersones te identifiseer, die eerste een se chemie stem redelik ooreen met 'n skoon akwifer, die tweede een se chemie is bernvloed deur die myn en die derde se chernie is deur granite bemvloed. Kontaminasie word aangedui as geassosieer met mynboubedrywighede, veral die slikdamme, en landbou. Rehabilitasie van damme en afvalhope, asook oppervlak waterbeheer mag help om die probleem te verminder. Deur die mynwater probleme wat in die gevallestudies ontdek is in ag te neem, word 'n nuutgepatenteerde chemiese behandeling ondersoek en getoets vir moontlike toepassing in die mynboubedryf. Dit word aangewys as uiters effektief vir die verwydering van kalsium, maar minder effektief in die verwydering van yster en mangaan. In die algemeen, wys hierdie studie inter-afhanklikheid tussen mynwater geochemie en mynwater bestuur, en 'n behoefte aan 'n rnultidissiplinere benadering.
Leroy, Annie. "Une methode generale de calcul des systemes portants et/ou propulsifs minces (fluide parfait incompressible en ecoulement instationnaire)." Orléans, 1997. http://www.theses.fr/1997ORLE2018.
Повний текст джерелаBasson, Gysbert. "An explicit finite difference method for analyzing hazardous rock mass." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17957.
Повний текст джерелаENGLISH ABSTRACT: FLAC3D is a three-dimensional explicit nite difference program for solving a variety of solid mechanics problems, both linear and non-linear. The development of the algorithm and its initial implementation were performed by Itasca Consulting Group Inc. The main idea of the algorithm is to discritise the domain of interest into a Lagrangian grid where each cell represents an element of the material. Each cell can then deform according to a prescribed stress/strain law together with the equations of motion. An in-depth study of the algorithm was performed and implemented in Java. During the implementation, it was observed that the type of boundary conditions typically used has a major in uence on the accuracy of the results, especially when boundaries are close to regions with large stress variations, such as in mining excavations. To improve the accuracy of the algorithm, a new type of boundary condition was developed where the FLAC3D domain is embedded in a linear elastic material, named the Boundary Node Shell (BNS). Using the BNS shows a signi cant improvement in results close to excavations. The FLAC algorithm is also quite amendable to paralellization and a multi-threaded version that makes use of multiple Central Processing Unit (CPU) cores was developed to optimize the speed of the algorithm. The nal outcome is new non-commercial Java source code (JFLAC) which includes the Boundary Node Shell (BNS) and shared memory parallelism over and above the basic FLAC3D algorithm.
AFRIKAANSE OPSOMMING: FLAC3D is 'n eksplisiete eindige verskil program wat 'n verskeidenheid liniêre en nieliniêre soliede meganika probleme kan oplos. Die oorspronklike algoritme en die implimentasies daarvan was deur Itasca Consulting Group Inc. toegepas. Die hoo dee van die algoritme is om 'n gebied te diskritiseer deur gebruik te maak van 'n Lagrangese rooster, waar elke sel van die rooster 'n element van die rooster materiaal beskryf. Elke sel kan dan vervorm volgens 'n sekere spannings/vervormings wet. 'n Indiepte ondersoek van die algoritme was uitgevoer en in Java geïmplimenteer. Tydens die implementering was dit waargeneem dat die grense van die rooster 'n groot invloed het op die akkuraatheid van die resultate. Dit het veral voorgekom in areas waar stress konsentrasies hoog is, gewoonlik naby areas waar myn uitgrawings gemaak is. Dit het die ontwikkelling van 'n nuwe tipe rand kondisie tot gevolg gehad, sodat die akkuraatheid van die resultate kon verbeter. Die nuwe rand kondisie, genaamd die Grens Node Omhulsel (GNO), aanvaar dat die gebied omring is deur 'n elastiese materiaal, wat veroorsaak dat die grense van die gebied 'n elastiese reaksie het op die stress binne die gebied. Die GNO het 'n aansienlike verbetering in die resultate getoon, veral in areas naby myn uitgrawings. Daar was ook waargeneem dat die FLAC algoritme parralleliseerbaar is en het gelei tot die implentering van 'n multi-SVE weergawe van die sagteware om die spoed van die algoritme te optimeer. Die nale uitkomste is 'n nuwe nie-kommersiële Java weergawe van die algoritme (JFLAC), wat die implimentering van die nuwe GNO randwaardekondisie insluit, asook toelaat vir die gebruik van multi- Sentrale Verwerkings Eenheid (SVE) as 'n verbetering op die basiese FLAC3D algoritme.
Sjöström, Jenny, and Marie Wilhelmsson. "Säkrare utveckling och användning av kalkylark inom mindre och medelstora företag : en metod." Thesis, Högskolan i Borås, Institutionen Handels- och IT-högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18612.
Повний текст джерелаUppsatsnivå: D
Loomis, Ian Morton. "Application of water mist to fuel-rich fires in model coal mine entries." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-01102009-063037/.
Повний текст джерелаPan, Guocheng. "Concepts and methods of multivariate information synthesis for mineral resources estimation." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184946.
Повний текст джерелаJan, Yannick. "Modélisation de la propagation de fissure sur des structures minces, soumises à des sollicitations intenses et rapides, par la méthode X-FEM." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI066/document.
Повний текст джерелаIn shipbuilding industry, classical methods to analyze the behavior of structures under extreme loadings are very dependent on the size of the mesh. Moreover, propagation over long lengths with volumetric models requires huge processing power, often inaccessible within this framework. In order to manage these issues and due to the geometry to be considered, a coupling between shell finite element and the extended finite element method (X-FEM) using an adapted propagation criterion is proposed. The developments are made in the fast explicit dynamic finite element code EUROPLEXUS, CEA Saclay. For shell structures involving significant thickness such as submarines, Mindlin-Reissner theory is needed to enable shear strain. Therefore, locking-free element are used to avoid the numerical issue of shear-locking that appears when the shell becomes too thin. The fracture of Mindlin-Reissner plates based on the X-FEM discrete approximation framework is studied by Dolbow and Belytschko with the MITC4. A four node shell element using the same formulation is here only enriched with a step function along the crack line to take into consideration the discontinuity of the displacement field across the crack. The calculation remains accurate without the asymptotic enrichment functions near the crack-tip, as long as the mesh is refined near the crack tip. The numerical integration issue for elements cut by the crack is solved by a partitioning strategy developed by Elguedj. Since the crack is contained in the shell for which the mid plane's position is entirely known, only one information left is needed to locate it. Therefore, a crack is represented by several line segments on the three-dimensional mesh. Only through thickness cracks are considered so far. As regards to the crack propagation, a local criteria proposed by Haboussa is used based on the calculation of mechanical equivalent quantities in the vicinity of the crack tip. The maximum of the equivalent stress tensor near the crack tip is used to decide if the crack propagates as well as its propagation direction, and the Kaninen equation gives the crack velocity
Aguir, Khalifa. "Nouvelle methode de pulverisation reactive : synthese et caracterisation de films minces de ga::(x)as::(1-x) amorphe hydrogene." Toulouse 3, 1987. http://www.theses.fr/1987TOU30174.
Повний текст джерелаGOETZBERGER, OLIVIER. "Depot et caracterisation de films minces de silicium sur substrat polymere par la methode cvd assistee par photons lumineux." Université Louis Pasteur (Strasbourg) (1971-2008), 1996. http://www.theses.fr/1996STR13159.
Повний текст джерелаEL, GHAZOULI KAMAL HEIZMANN JEAN JULIEN. "NOUVELLES METHODES D'ANALYSE, PAR DIFFRACTION DES RAYONS X, DES VARIATIONS DE TEXTURE DANS LES COUCHES MINCES /." [S.l.] : [s.n.], 1998. ftp://ftp.scd.univ-metz.fr/pub/Theses/1998/El_Ghazouli.Kamal.SMZ9826.pdf.
Повний текст джерелаJara, Olivares Angelica Yuliana. "Biocompatible nanostructured multilayer systems." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT222/document.
Повний текст джерелаThin films have been the subject of intense study in materials because they offer multiple applications of great interest. Various surfaces have been modified with thin films or coatings to study how to improve their bioactivity and biocompatibility properties to form a biomaterial. Thin films of Ta, TaN and Ta/TaN were deposited on glass substrates, metallic substrates, SS316LVM and Ti, by RF Sputtering technique. By High angle XRD and GIXRD it was found that the nature of the substrate has a strong influence on the Ta phase formed. Formation of ordered α-Ta phase was obtained on SS316LVM, but the disordered metastable β-Ta phase was formed on Ti and on TaN substrates. While TaN crystallizes in the cubic phase (Fm3m) NaCl type on metallic substrates but shows a preferential orientation in the (200) plane on the glass substrate. The chemical analysis of the surfaces by XPS reveals that in the surfaces of the deposited layers are several oxidized chemical species such as Ta2O5, TaOxNy TaxOy due to Ta is a very reactive metal and is readily oxidized even at low partial pressures as for our synthesis conditions. Characterization by Scanning Electron Microscopy reveals that the microstructure of the films was homogeneous with small clusters size and a cauliflower type, also the films exhibit the typical columnar growth for films deposited by PVD techniques, following the growth of zone I described by the model developed by Movchan and Demchisin and Thornton. Biomimetic method was used to evaluate the bioactivity in all surfaces which involves immersing the thin films in simulated body fluid (SBF) to promote the deposition of calcium phosphates, two concentrations were used to assess qualitatively which could deposit the stoichiometric calcium phosphate hydroxyapatite and make it more efficiently. The SBF 1.5 enriched in Ca2 + and PO43- ions was chosen. A new layer was deposited upon the surfaces and it was determined by XRD, FTIR and XPS that crystalline Hydroxyapatite phase was formed, so that all our surfaces have the ability to form apatite spontaneously after an immersion period of three weeks. The mechanism of deposition of HAp involves the formation of small amounts of Ta-OH groups by a hydration of the tantalum oxide passive layer on its surface. To study biocompatibility properties, films were placed in cell culture containing osteoblasts, all surfaces exhibit cell adhesion and formation of filipodia. Whereas one of the main problems of bone implants is biofilm formation caused by bacterial colonization, tests were made with the bacterium Pseudomonas Aeruginosa, which is a major human opportunistic pathogens in surgical procedures, causing infections in soft tissue, bones, among others. This assay allowed us to know how the different surfaces react when exposed to this bacteria, Titanium had greater growth of P. aeruginosa and biofilm formation in all periods of study, while Ta surfaces showed the lowest activity of biofilm formation. Mesoporous silica thin films where used as bactericidal agents, and it was found by MEB that no microbial colonization or biofilm formation occur on these surfaces