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1
Tawil, Marc Rami. "Engineering properties of iron mine slimes for tailings dam stability". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10775.
2
Espinosa, Gómez Rodolfo. "Recovery of pyrochlore from slimes discarded at Niobec by column flotation". Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75946.
Abstract (sommario):
The Niobec concentrator recovers niobium minerals (principally pyrochlore) from carbonate and silicate gangue. In the process some 15% of the Nb is rejected in a slimes ($-$10 $ mu$m) product. Recovery of pyrochlore from the slimes was studied. The study was performed using plant water which contained about 200 ppm Ca, 100 ppm Mg and variable quantities of organics as the main contaminants. Selective pyrochlore collectors and selective silicate depressants were evaluated. Four possible routes to float pyrochlore selectively were found. All routes required prior carbonate flotation. Carbonate flotation was attempted using fatty acids and sodium silicate dispersant (as conducted at Niobec) in a flotation column. However, pyrochlore also floated as a result of inadequate dispersion of the slimes. Therefore, new dispersants were tested, which proved effective only at high concentration, because reaction with Ca and Mg cations in the water. High dispersant concentration caused carbonate depression.An additional problem in the flotation column was bubble coalescence and collapse of the froth. This was caused by the fatty acids, enhanced by the high dispersant concentration.
A novel method of quantifying coalescence using the change in gas holdup in the column was developed. A stable froth could be made at high fatty acid emulsifier concentration, but his promoted unselective flotation. Only by working at high percent solids (10% vs 1%) could sufficient emulsifier be introduced into solution without exceeding the dosage (per unit mass of solids) above which flotation is unselective. For such high percent solids work must be conducted at plant site. Preliminary plant column work was encouraging.
Extensive testwork on very fine feeds (80% $-$20 $ mu$m) at Niobec, and at Mt Isa Mines (Australia) confirmed that column flotation is ideal for selective flotation of fines principally due to reduced gangue entrainment.
3
González, Domínguez José Alberto. "Electrochemical processes within the slimes layer of lead anodes during Betts electrorefining". Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30919.
Abstract (sommario):
In the Betts process for lead electrorefining the noble impurities originally present in the bullion form a strong and adherent layer of slimes. Within this layer the established ionic concentration gradients can lead to secondary reactions. The following processes were analyzed from a thermodynamic perspective: (A) hydrolysis of the acid (B) precipitation of secondary products (C) reaction of noble compounds.
The nature of the concentration gradients within the slimes layer and related secondary processes was studied by using transient electrochemical techniques which include: (A) current interruption, (B) AC impedance, and (C) a variation of SACV (Small Amplitude Cyclic Voltammetry). These studies were complemented by: (A) physico-chemical data on electrolyte properties, (B) "insitu" and "industrially recovered" slimes electrolyte compositions, (C) SEM and X-ray diffraction analysis of the slimes layer. For comparison purposes the electrochemical behaviour of "pure" Pb electrodes was also studied.
Upon current interruption the anodic overpotential decays, first abruptly, (as the uncompensated ohmic drop disappears) and then slowly (due to the presence of a back E.M.F. created by ionic concentration gradients that decay slowly). Current interruption measurements showed that: (A) concentration gradients exist across the slimes layer, (B) inner solution potentials within the slimes layer can be larger than those measured from reference electrodes located in the bulk electrolyte, (C) secondary products can shift the inner solution potential to negative values which reverse upon re-dissolution and (D) ionic diffusion is seen upon current interruption but it is complex and difficult to model due to the presence of processes that can support the passage of internal currents.
The anodic polarization components were obtained by analyzing the potential and current dependance upon application of a small amplitude sinusoidal waveform. This dependance was found to be linear in the low overpotential region (< 250mV). Thus, upon subtraction of the uncompensated ohmic drop, the remaining polarization is due to the "apparent" ohmic drop of the slimes electrolyte and to liquid junction and concentration overpotentials. These components are directly linked to the electrolysis conditions and to the slimes layer structure. Furthermore, the ratio of these components can be used to obtain the point at which the precipitation of secondary products starts. Changes in this ratio can also be related to the anodic effects caused by the presence of addition agents.
AC impedance measurements performed in the presence of a net Faradaic current showed that the impedance increases uniformly as the slimes layer thickens up to the point at which noble impurities start to react. Three electrical analogue models were used to describe the impedance spectra.
A steady-state mathematical model that predicts concentration and potential gradients across the slimes layer was developed. Only when a position dependent eddy diffusion term was incorporated in the numerical solution, were reasonable local ionic concentrations and overpotentials obtained.Applied Science, Faculty of
Materials Engineering, Department of
Graduate
4
Vermeulen, Nicolaas Johannes. "The composition and state of gold tailings". Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-03102006-122937/.
5
Molebiemang, G. M. "Development of a beneficiation route to upgrade Sishen iron ore jig slimes for iron making". Thesis, n/a, 2017. http://hdl.handle.net/10352/403.
Abstract (sommario):
A dissertation submitted in fulfilment of the requirements for the Magister Technologiae: Engineering: MetallurgicalKumba Iron Ore’s Sishen mine is located in South Africa’s Northern Cape Province and produces about 40 million tons (Mt) of iron ore per annum. The ore body consists mainly of laminated and massive type hematite ore of which 30 Mt is being beneficiated by Dense Medium Separation (DMS), while the remaining 10 Mt is processed by the jig plant that was added as an expansion to the DMS processing route. The jigs at the jig plant are employed to treat coarse, medium and fine Run of Mine Ore (ROM). Due to the presence of finer particles on the screened ROM, hydrocyclones are employed on the secondary screen that feed the finer jig to produce fines on the overflow that is fed to the thickeners for dewatering by sedimentation, and the formation of clear liquid that can be recycled to the Jig plant. However, it was suspected that a substantial amount of the iron gets lost to the hydrocylone overflow with slimes. These slimes consist of very fine particles (about 90%-45μm) which make treatment with gravity concentration methods difficult. Sishen mine attempts to beneficiate the slimes using Pulsating High Gradient Magnetic Separators (PHGMS). However, PHGMS produce a concentrate consisting of 64.0% iron and 5.0% silica which render the slimes not suitable for pelletizing. Normally the slimes are considered as waste and are rejected to the slimes ponds. Rejecting slimes is not only a loss of resources, but it also poses severe long-term environmental problems. Recovery of iron minerals from the tailings produced in a large iron ore operation is of importance as it will result in environmental and economic benefits which indicate the importance of utilising those accumulated fines.
n/a
6
Chikusa, Chimwemwe Mainsfield. "Pollution caused by mine dumps and its control". Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005603.
Abstract (sommario):
All mine dumps are a point source of either physical, chemical or both forms of pollution. Physical pollution includes the physical site coverage of the dump, slumping of parts of the dams and dust that may originate from it (air pollution). Chemical pollution from, or related to the mine dumps include the dominant acid drainage (which contains heavy metals), radioactivity, electromagnetic radiation, noise and chemicals released from the mineral processing stage. In one way or the other, exposure to these pollution forms is detrimental to the human health and his environment. It is this fact that urges the public, government and the responsible mining companies to find ways of monitoring the pollution and stopping it, preferably at the source. Where it can not be stopped, techniques of reducing it, or containing it have been, and are still being developed. Personal protection is the priority. Pollution exposure to the general public is minimised as much as possible. Pollution control techniques that employ less expensive, natural, self-sustaining elements suitable for the environment such as wetlands and vegetation are recommended. The artificial short term and often expensive alternatives are of secondary priority. However, choice of which technique to use is based on the merit of each problem, knowing that chemicals act faster but are effective for a short period as compared to the natural systems. Pollution management is the critical part of the whole process. This involves decision making on courses of action and financial allocation on the part of both the polluter and the monitoring department/agent. The ability to effectively manage pollution programmes is achieved these days with the aid of computers. It is emphasised that pollution control should be handled in an integrated, multi-disciplinary approach manner. This is because pollution is a question of life and death, hence every individual remains accountable to it. Keeping the public and the concerned parties educated, informed and welcoming their concerns on the environmental issues related to the mine dumps generated in a mining venture is essential in the modern days of environmental public awareness, or otherwise face the public lath.
7
Abrahams, Jamie-Leigh Robin. "Geochemistry of Gold One tailings and associated contaminant transport into the Randfontein area, Witwatersrand Basin". University of the Western Cape, 2017. http://hdl.handle.net/11394/6376.
Abstract (sommario):
Magister Scientiae - MSc (Earth Science)The city of Randfontein, in the Witwatersrand, hosts several slimes and tailings storage facilities which pose potential threat to the environment in the form of acid mine drainage (AMD). The latter, readily scavenges toxic metals, contaminating surrounding soils and water resources, thereby potentially compromising the overall environmental- and public health of the area. To this end, three slimes sections (section T001, T002 and T003) from the Gold One Millsite Slimes Complex were investigated, with the aim of understanding metal release from the slimes dam into the Randfontein area. To achieve this, the mineralogical and geochemical factors controlling metal release were investigated using combined core log analysis, cluster and discriminant analysis, x-ray diffraction analysis, bulk geochemical analysis, acid base accounting methods and selective sequential extraction procedures.
8
Аблєєва, Ірина Юріївна, Ирина Юрьевна Аблеева, Iryna Yuriivna Ablieieva, Леонід Дмитрович Пляцук, Леонид Дмитриевич Пляцук, Leonid Dmytrovych Pliatsuk e Д. Ю. Москаленко. "Комплексний підхід до вирішення проблеми утилізації нафтових шламів". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/63361.
Abstract (sommario):
Проблема впливу підприємств нафтогазової промисловості на стан атмосферного повітря, поверхневих та підземних вод, ґрунтово-рослинного покриву не втрачає актуальності і на сьогодні. Нафтова промисловість в силу специфіки своєї діяльності є потенційно небезпечною для довкілля. Це обумовлено токсичністю вуглеводнів, що видобуваються із супутніх їм речовин, та відносяться до 3–4 класів небезпеки.Мета роботи полягає у підвищенні рівня екологічної безпеки територій за рахунок впровадження раціональної комплексної системи поводження з відходами нафтопереробки.
9
Шкоп, А. О. "Закономірності процесів розділення шламових вод з полідисперсною твердою фазою в осаджувальних центрифугах". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/52408.
Abstract (sommario):
Дисертаційну роботу присвячено виявленню закономірностей процесів розділення шламових вод з полідисперсною твердою фазою в осаджувальних центрифугах. В роботі всебічно досліджено вплив концентрації і дисперсного складу на міцність флокул при механічному впливі. Встановлено, що залишкова швидкість осадження флокул після механічного впливу при постійній витраті флокулянта має найбільше значення при концентрації твердої фази в шламі в інтервалі 7 – 30 г/дм3. Найкращі результати у всіх дослідах отримані при концентрації твердої фази, яка дорівнює 10 г/дм3. Виявлено, що при концентрації до 7 г/дм3 і понад 30 г/дм3 спостерігається утворення флокул, що володіють найменшою залишковою швидкістю після механічного впливу. Із зростанням вмісту частки твердої фази крупністю 40 – 100 мкм понад 15 % зростає міцність флокул, які зберігають свою форму і достатньо високу швидкість осадження навіть після механічних впливів. Одержані дані дозволяють рекомендувати коректування складу шламу перед введенням флокулянта як за концентрацією, близькою до оптимальної, так і за вмістом частки класу крупністю 40 – 100 мкм понад 15 %. Показано, що із зростанням концентрації твердої фази у згущеному шламі понад 140 – 150 г/дм3 істотно зменшується міцність агрегатів до механічних впливів.Диссертационную работу посвящено выявлению закономерностей процессов разделения шламовых вод с полидисперсной твердой фазой в осадительных центрифугах. В работе всесторонне исследовано влияние концентрации и дисперсного состава на прочность флокул к механическим воздействиям. Установлено, что остаточная скорость осаждения флокул после механического воздействия при постоянном расходе флокулянта имеет наибольшее значение при концентрации твердой фазы в шламе в интервале 7–30 г/дм3. Наилучшие результаты во всех опытах получены при концентрации твердой фазы, равной 10 г/дм3. Выявлено, что при концентрации до 7 г/дм3и свыше 30 г/дм3 наблюдается образование флокул, обладающих наименьшей остаточной скоростью после механических воздействий. С ростом содержания доли твердой фазы крупностью 40–100 мкм свыше 15 % возрастает прочность флокул, которые сохраняют свою форму и достаточно высокую скорость осаждения даже после механических воздействий. Разработаны рекомендации по выбору технологических параметров обезвоживания шламовых вод различных производств в осадительных шнековых центрифугах с использованием химического усиления флокулянтами агрегатообразования полидисперсных шламов. Полученные данные позволяют рекомендовать корректировку состава шлама перед вводом флокулянта как по концентрации, близкой к оптимальной, так и по содержанию доли класса крупностью 40–100 мкм свыше 15 %. Показано, что с ростом концентрации твердой фазы в сгущенном шламе свыше 140–150 г/дм3 существенно уменьшается прочность агрегатов к механическим воздействиям. Это позволяет рекомендовать сгущать шлам до заданной величины. Предложены пути минимизации механических воздействий на сфлокулированный шлам в центрифуге. В частности, предложен способ модернизации конструкции центрифуги, заключающийся в том, что вдоль боковой поверхности трубы питания выполнены каналы, направленные тангенциально к боковой поверхности трубы питания таким образом, чтобы направление течения суспензии из каналов совпадало с направлением вращения ротора. В результате такой подачи только малая часть потока испытывает сдвиговые напряжения. Другим направлением, снижающим механические воздействия на флокулы является установка в барабане разгонной втулки с направляющими трубками, препятствующими разбрызгиванию суспензии. В результате этих рекомендаций разработана усовершенствованная конструкция осадительной центрифуги, обладающая при соблюдении оптимальных условий флокуляции высокой степенью удаления твердой фазы, возможностью получения осадка относительно низкой влажности, а также низким расходам энергии на процесс.
The thesis is concerned with conformities to the law of processes of division of slime waters with a polydispersed hard phase in decanting centrifuges. The influence of concentration and dispersible composition on durability of floccules to mechanical influences was investigated in detail. The effect of the concentration and disperse composition on the flocculation strength to mechanical influence is investigated. It is found that the residual rate of floccules sedimentation after the mechanical influence at a constant rate of flocculant has a maximum value at a concentration of solids in the slime in the range of 7–30 g/dm3. The best results are obtained in all the experiments at a solids concentration of 10 g/dm3. It is found that at a concentration up to 7 g/dm3 and more than 30 g/dm3, the floccules are formed. They have the lowest residual rate after mechanical influences. With increasing content of the solid fraction of 40 – 100 microns over 15%, the strength of floccules increases. They retain their shape and relatively high sedimentation rate even after mechanical influence. The obtained data allow recommending correction of the slime composition before flocculant injection both the concentration close to the optimum, and the content of size fraction of 40 – 100 microns more than 15%. It was offered that with an increase in the degree of thickening of more than 140–150 g/dm3 the resistance of aggregates to mechanical influence substantially decreases.
10
Theophil, Sebastian Christoph. "Sketching Slides". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2011. http://dx.doi.org/10.18452/16368.
Abstract (sommario):
Die Entwicklung effizienter Desktop Publishing Systeme wird behindert durch den Mangel an leistungsfähigen, automatischen Layoutalgorithmen. Aktuelle Algorithmen zum Layout ganzer Dokumente oder einzelner Seiten erfordern entweder die Formulierung des Layoutproblems in einer formalen Beschreibungssprache, oder sie benötigen fertige, detaillierte Layouttemplates. Layoutprobleme mit schwacher Semantik lassen sich schlecht in formale Sprachen umsetzen, Layout Templates verschieben den manuellen Aufwand nur vom Endnutzer zum Template Designer. Das erste Ergebnis dieser Dissertation ist ein Layoutalgorithmus, der ein allgemeines Layoutproblem löst, in dem er es als Ressourcenallokationsproblem interpretiert. Die Fläche einer einzelnen Seite ist eine Ressource, die zwischen den visuellen Elementen einer Seite verteilt wird. Das Layoutproblem wird in ein lexikographisches min-ordering Optimierungsproblem übersetzt, das durch lineare Optimierung in Echtzeit gelöst wird. Die Lösungen manuell erzeugter Layoutprobleme sind häufig über- oder unterbestimmt. Wenn das Problem überbestimmt ist, also keine gültige Lösung besitzt, muss der Algorithmus die Lösung finden, die am n\"achsten an der intendierten Lösung ist. Der Algorithmus erkennt nicht eindeutig definierte Probleme mit unbefriedigenden Lösungen und fügt die minimal notwendige Anzahl von Constraints hinzu um das vom Nutzer beabsichtigte Layout zu erzeugen. Das zweite Ergebnis ist die Entwicklung einer intuitiven Benutzerschnittstelle, die es erlaubt, die vorhergehend beschriebenen Layoutprobleme zu erzeugen. Sie verbirgt die Komplexität des Constraintsystems und vermeidet die Komplexität constraint-basierter Grafikanwendungen der Vergangenheit. Diese Benutzerschnittstelle macht formale Beschreibungssprachen und manuell erzeugte Layouttemplates überflüssig. Die Evaluation zeigt, dass die besten Tabellenlayoutalgorithmen keine signifikant besseren Ergebnisse produzieren als der allgemeinere ICBM Layout Algorithmus.The efficiency of desktop publishing is severely limited by the lack of sophisticated automatic document layout systems. State-of-the-art algorithms either require the input to be written in a description language such as HTML and LaTeX, or to be a manually designed layout template. However, description languages are ill-suited to express layout problems with weak semantics and layout templates shift the burden from the end user to the template designer. The first contribution of this thesis is an algorithm that solves a general class of layout problems by treating them as equitable resource allocation problems. The available document area is a resource that is distributed among inter-element gaps. The layout problem is transformed into a lexicographic min-ordering optimization problem that is solved using linear programming techniques in real-time. If the layout problem is over-constrained, the quality of the solution layout degrades gracefully. The layout algorithm finds the solution layout with the most equitable distribution of constraint errors among the soft layout constraints, i.e., the solution closest to the user''s original intent. Conversely, the layout algorithm detects the under-constrained subproblems that adversely affect the solution layout. It adds the minimal number of constraints required to achieve the fully specified layout problem that is closest to the user''s input. The second contribution is the creation of an intuitive direct manipulation user interface that lets users create the aforementioned class of general constrained layout problems. It hides the complexity of the constraint system and avoids the usability problems that have plagued constraint drawing applications. It eliminates the need of document description languages and manually-created layout templates. In the evaluation, we show that the best state-of-the-art specialized table layout algorithms do not outperform the general ICBM layout algorithm by any significant margin.
11
Silva, Klaydison. "New approach to hematite recovery from ultrafine iron ore processing tailings : From fundamental studies to on-site pilot testing". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0287.
Abstract (sommario):
L'objectif principal du travail de thèse est de définir et d'expliquer le comportement différentiel de l'hématite et des silicates à l'aide de réactifs plus sélectifs dans la flottation inverse des schlammes de minerai de fer. La méthodologie proposée est basée sur l'utilisation des effets des réactifs de flottation pour augmenter la récupération des particules fines des résidus de traitement du minerai de fer. Des méthodes spectroscopiques et électrocinétiques permettront de comprendre la différence d'hydratation de la surface minérale. Des essais de flottation à l'échelle du laboratoire et une modélisation moléculaire du mécanisme d'interaction entre les collecteurs et la surface de quartz et d'hématite seront également réalisés. Des essais pilotes valideront les résultats obtenus dans ce travail de thèse multi-échelleThe main objective of the thesis work is to define and explain the differential behavior of hematite and silicates using more selective reagents in the reverse flotation of iron ore slimes. The proposed methodology is based on using the effects of flotation reagents to increase the recovery of fine particles from iron ore processing tailings. Spectroscopic and electrokinetic methods will make it possible to understand the difference in hydration of the mineral surface. Laboratory-scale flotation tests and molecular modeling of the mechanism of interaction between the collectors and the surface of quartz and hematite will also be carried out. Pilot tests will validate the results obtained in this multi-scale thesis work
12
Rambani, Komal. "Thick brain slice cultures and a custom-fabricated multiphoton imaging system: progress towards development of a 3D hybrot model". Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22702.
Abstract (sommario):
Development of a three dimensional (3D) HYBROT model with targeted in vivo like intact cellular circuitry in thick brain slices for multi-site stimulation and recording will provide a useful in vitro model to study neuronal dynamics at network level. In order to make this in vitro model feasible, we need to develop several associated technologies. These technologies include development of a thick organotypic brain slice culturing method, a three dimensional (3D) micro-fluidic multielectrode Neural Interface system (µNIS) and the associated electronic interfaces for stimulation and recording of/from tissue, development of targeted stimulation patterns for closed-loop interaction with a robotic body, and a deep-tissue non-invasive imaging system. To make progress towards this goal, I undertook two projects: (i) to develop a method to culture thick organotypic brain slices, and (ii) construct a multiphoton imaging system that allows long-term and deep-tissue imaging of two dimensional and three dimensional cultures.
Organotypic brain slices preserve cytoarchitecture of the brain. Therefore, they make more a realistic reduced model for various network level investigations. However, current culturing methods are not successful for culturing thick brain slices due to limited supply of nutrients and oxygen to inner layers of the culture. We developed a forced-convection based perfusion method to culture viable 700µm thick brain slices.
Multiphoton microscopy is ideal for imaging living 2D or 3D cultures at submicron resolution. We successfully fabricated a custom-designed high efficiency multiphoton microscope that has the desired flexibility to perform experiments using multiple technologies simultaneously. This microscope was used successfully for 3D and time-lapse imaging.
Together these projects have contributed towards the progress of development of a 3D HYBROT.
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3D Hybrot: A hybrid system of a brain slice culture embodied with a robotic body.
13
Nel, Johannes Hendrik. "An investigation of mine closure : gold mine case studies on the East Rand in South Africa / J.H. Nel". Thesis, North-West University, 2008. http://hdl.handle.net/10394/4088.
Abstract (sommario):
This research is on mines that struggle to obtain closure from the state departments. The closure process at the footprints of five Tailings Storage Facilities (TSFs) of a South African gold mine was investigated. They are situated in the Germiston, Brakpan, Springs and Nigel suburbs of the East Rand region of Johannesburg.
Very limited scientific research has been done in South Africa on the management of mine closure. The most recent performed research was completed at Coal mines and only one was at an underground gold mine. The history of the case studies at a surface gold mine revealed similar problems, as confirmed in previous research, during the interviews with mine management and the review of operational documents.
There is a whole array of causes giving rise to the struggle to obtain closure by a mine, that will be subsequently discussed. Major causes are the lack of estimation of closure costs and the lack of a proper Project Life Cycle (PLC) process for closure by mine management. Previous investigations indicated a general shortfall in estimated closure costs, mining operations that are not planned with closure in mind, closure objectives that are not set at all management levels, final land use after mine closure that is not defined properly, residual and latent impacts that are not dealt with, the post-closure period when the final impact will occur that is not defined and a proper risk assessment based on detailed information that is not properly done and communicated. Another cause is that the integrated process of making closure part of the Environmental Management Programme Report (EMPR) process is not followed. The result of not following the correct process is that mines do not obtain closure. Another reason why mines do not obtain closure is because of an underdeveloped mine infrastructure, e.g. tailings facilities, waste rock dumps, shafts and plants that are not constructed in an environmentally friendly way during the operational phases to facilitate closure. Therefore, these structures need to be changed in terms of their topography and growth medium to ensure an improvement in environmental parameters. This will assist in obtaining sustainability and final closure. Significantly more trust fund money than initially estimated during operations needs to be spent to ensure the above change.
Specific issues defined from the case studies were the adaptation of the administration of the closure process, the management of risks, especially the differences in opinions, the management of the mine life cycle for closure and involvement of the land owners and Interested and Affected Parties (l&APs).
This research was necessary because companies are uncertain and lack the competency to estimate and to correctly spend trust fund money in order to be sure of obtaining closure. This situation threatens the long-term survival of mining-companies by holding assets and profits back until closure is attained. The state departments also have to address the risks and have to rehabilitate the polluted mine sites if companies do not obtain closure.
A proper PLC to facilitate closure was compiled from the above-mentioned data. An important fact to bear in mind is that the activities within the life cycle depend on one another. Therefore, when one activity is disregarded or not properly performed, it will influence the outcome of the remaining activities.
The methodology of the research was as follows: Categories to evaluate the closure process of the selected case studies were determined from the project life cycle and the management principles of the literature review. Thereafter a questionnaire was developed from these categories. The questionnaire was subsequently used to guide interviews. After the interviews these categories and findings from the questionnaire were combined and summarised into key findings.
The key findings of the research were:
• The driving force behind obtaining closure must shift from the State Departments to the mining companies. They must realise there is an opportunity during the closure process to make money and to minimise their long-term liability. The mining company must thus drive the closure process to obtain environmental sustainability.
• The gold mines do have problems in terms of cost estimation and trust fund expenditure at their TSF footprints during the closure process. The reasons were a mismanagement of the closure process and making use of a limited information system to make decisions.
• A proper closure process does exist, but it can be improved to ensure all interested and affected parties have the same expectations from closure.
• There are many activities in the closure process flow diagram which were not properly attended to according to the case studies.
• A conceptual closure plan and a draft rehabilitation plan with broad objectives, policies and strategies with detailed descriptions were not compiled during the operational phase, because limited scientific monitoring information was gathered to do a proper risk assessment and some l&APs consultation was done mainly with the material and land owners on a one on one basis.
From these key findings the following recommendations could be formulated:
• Any mining operation should conduct a closure audit at least every second year and before mining activities change.
• A searchable record keeping system must be established to keep track of the closure life cycle development.
• Detailed conceptual and final closure plans need to capture the data from the audits and record keeping system.
• A communication forum with company management and environmental specialists needs to be established.Thesis (M. Environmental Management)--North-West University, Potchefstroom Campus, 2009.
14
Pachmann, Sydney. "Swimming in slime". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1503.
Abstract (sommario):
The purpose of this thesis is to study the problem of a low Reynolds number
swimmer that is in very close proximity to a wall or solid boundary in a non-
Newtonian fluid. We assume that it moves by propagating waves down its length
in one direction, creating a thrust and therefore propelling it in the opposite
direction. We model the swimmer as an infinite, inextensible waving sheet.
We consider two main cases of this swimming sheet problem. In the first
case, the type of wave being propagated down the length of the swimmer is
specified. We compare the swimming speeds of viscoelastic shear thinning,
shear thickening and Newtonian fluids for a fixed propagating wave speed. We
then compare the swimming speeds of these same fluids for a fixed rate of work
per wavelength. In the latter situation, we find that a shear thinning fluid
always yields the fastest swimming speed regardless of the amplitude of the
propagating waves. We conclude that a shear thinning fluid is optimal for the
swimmer. Analytical results are obtained for various limiting cases. Next, we
consider the problem with a Bingham fluid. Yield surfaces and flow profiles are
obtained.
In the second case, the forcing along the length of the swimmer is specified,
but the shape of the swimmer is unknown. First, we solve this problem for a
Newtonian fluid. Large amplitude forcing yields a swimmer shape that has a
plateau region following by a large spike region. It is found that there exists
an optimal forcing that will yield a maximum swimming speed. Next, we solve
the problem for moderate forcing amplitudes for viscoelastic shear thickening
and shear thinning fluids. For a given forcing, it is found that a shear thinning
fluid yields the fastest swimming speed when compared to a shear thickening
fluid and a Newtonian fluid. The difference in swimming speeds decreases as
the bending stiffness of the swimmer increases.
15
Madan, Anmol P. (Anmol Prem Prakash). "Thin slices of interest". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/36111.
Abstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2005.Includes bibliographical references (p. 87-92).
In this thesis we describe an automatic human interest detector that uses speech, physiology, body movement, location and proximity information. The speech features, consisting of activity, stress, empathy and engagement measures are used in three large experimental evaluations; measuring interest in short conversations, attraction in speed dating, and understanding the interactions within a focus group, all within a few minutes. In the conversational interest experiment, the speech features predict about 45% of the variance in self-reported interest ratings for 20 male and female participants. Stress and activity measures play the most important role, and a simple activity-based classifier predicts low or high interest with 74% accuracy (for men). In the speed-dating study, we use the speech features measured from five minutes of conversation to predict attraction between people. The features predict 40% of the variance in outcomes for attraction, friendship and business relationships. Speech features are used in an SVM classifier that is 75%-80% accurate in predicting outcomes based on speaking style. In the context of measuring consumer interest in focus groups, the speech features help to identify a pattern of behavior where subjects changed their opinions after discussion. Finally, we propose a prototype wearable 'interest meter' and various application scenarios. We portray a world where cell phones can automatically measure interest and engagement, and share this information between families and workgroups.
by Anmol P. Madan.
S.M.
16
Li, Nan Ph D. Massachusetts Institute of Technology. "Combinatorial aspects of polytope slices". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82441.
Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 69-70).
We studies two examples of polytope slices, hypersimplices as slices of hypercubes and edge polytopes. For hypersimplices, the main result is a proof of a conjecture by R. Stanley which gives an interpretation of the Ehrhart h*-vector in terms of descents and excedances. Our proof is geometric using a careful book-keeping of a shelling of a unimodular triangulation. We generalize this result to other closely related polytopes. We next study slices of edge polytopes. Let G be a finite connected simple graph with d vertices and let PG C Rd be the edge polytope of G. We call PG decomposable if PG decomposes into integral polytopes PG+ and PG- via a hyperplane, and we give an algorithm which determines the decomposability of an edge polytope. Based on a sequence of papers by Ohsugi and Hibi, we prove that when PG is decomposable, PG is normal if and only if both PG+ and PG- are normal. We also study toric ideals of PG, PG+ and PG-. This part is joint work with Hibi and Zhang.
by Nan Li.
Ph.D.
17
Maloni, Sara. "Slices of quasi-Fuchsian space". Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/57665/.
Abstract (sommario):
In Chapter 1 we present the background material about curves on surfaces. In particular we define the Dehn-Thurston coordinates for the set S = S(Σ) of free homotopy class of multicurves on the surface Σ. We also prove new results, like the precise relationship between Penner's and D. Thurston's definition of the twist coordinate and the formula for calculating the Thurston's symplectic form using Dehn-Thurston coordinates. For Chapter 2, let Σ be a surface of negative Euler characteristic together with a pants decomposition PC. Kra's plumbing construction endows Σ with a projective structure as follows. Replace each pair of pants by a triply punctured sphere and glue, or `plumb', adjacent pants by gluing punctured disk neighbourhoods of the punctures. The gluing across the ith pants curve is denied by a complex parameter μi ∈ C. The associated holonomy representation ρμ : π1 (Σ)--> PSL(2;C) gives a projective structure on Σ which depends holomorphically on the μi. In particular, the traces of all elements ρ μ (γ), where γ ∈ π1 (Σ), are polynomials in the μi. Generalising results proved in [24; 40] for the once and twice punctured torus respectively, we prove in Chapter 2 a formula giving a simple linear relationship between the coefficients of the top terms of Tr ρμ (λ ), as polynomials in the μi, and the Dehn-Thurston coordinates of relative to PC. We call this formula the Top Terms' Relationship. In Chapter 3, applying the Top Terms' Relationship, we determine the asymptotic directions of pleating rays in the Maskit embedding of a hyperbolic surface Σ as the bending measure of the `top' surface in the boundary of the convex core tends to zero. The Maskit embedding M of a surface Σ is the space of geometrically finite groups on the boundary of Quasifuchsian space for which the `top' end is homeomorphic to Σ, while the `bottom' end consists of triply punctured spheres, the remains of Σ when the pants curves have been pinched. Given a projective measured lamination [η] on Σ, the pleating ray P = P[η] is the set of groups in M for which the bending measure pl+(G) of the top component ∂C+ of the boundary of the convex core of the associated 3-manifold H3=G is in the class [η].
18
Fan, Yiming. "Presentation Slides Recommender System Design". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231862.
Abstract (sommario):
Using presentation software such as PowerPoint or Keynote to sup- port lectures and presentations has become ubiquitous in both academia and industry. However, designing the visuals of presentation slides is a time-consuming and laborious task; repetitive steps are required for selecting templates, organizing objects, and optimizing layouts. To al- leviate these laborious works and to allow users to focus on preparing the contents of presentations, we present SmartPPT, a framework that supports the automatic generation of presentation slides from textual outline. We built a Recommender System model inside the framework that could pick up slide templates for input textual outline. To test its functionality and efficiency, two sets of user study procedures were conducted and shown that SmartPPT is time efficient in generating slides and it outperforms in user satisfaction when compared to user- handcrafted slides and the baseline condition, which was PowerPoint suggested templates.Att använda presentationsprogram som PowerPoint eller Keynote för att stödja föreläsningar och presentationer har blivit allestädes närvarande både i akademin och industrin. Att utforma visuella bilder av presentationsmaterial är emellertid en tidskrävande och mödosam uppgift; upprepade steg krävs för att välja mallar, organisera objekt och optimera layouter. För att underlätta dessa mödosamma arbeten och låta användarna fokusera på att förbereda innehållet i presentationer presenterar vi SmartPPT, ett ramverk som stöder den automatiska generationen av presentationsbilder från en textvy. Vi byggde en Recommender System-modell inuti ramen som kunde plocka upp bildmallar för inmatning av textrutor. För att testa dess funktionalitet och effektivitet genomfördes två uppsättningar av användarstudieprocedurer och visade att SmartPPT är tidseffektivt för att generera bilder och användarna blev nöjdare jämfört med när man gjort handgjorda bilder eller använt PowerPoint-föreslagna mallar.
19
Fan, Quanfu. "Matching Slides to Presentation Videos". Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195757.
Abstract (sommario):
Video streaming is becoming a major channel for distance learning (or e-learning). A tremendous number of videos for educational purpose are capturedand archived in various e-learning systems today throughout schools, corporations and over the Internet. However, making information searchable and browsable, and presenting results optimally for a wide range of users and systems, remains a challenge.In this work two core algorithms have been developedto support effective browsing and searching of educational videos. The first is a fully automatic approach that recognizes slides in the videowith high accuracy. Built upon SIFT (scale invariant feature transformation) keypoint matching using RANSAC (random sample consensus), the approach is independent of capture systems and can handle a variety of videos with different styles and plentiful ambiguities. In particular, we propose a multi-phase matching pipeline that incrementally identifies slides from the easy ones to the difficult ones. We achieve further robustness by using the matching confidence as part of a dynamic Hidden Markov model (HMM) that integrates temporal information, taking camera operations into account as well.The second algorithm locates slides in the video. We develop a non-linear optimization method (bundle adjustment) to accurately estimate the projective transformations (homographies) between slides and video frames. Different from estimating homography from a single image, our method solves a set of homographies jointly in a frame sequence that is related to a single slide.These two algorithms open up a series of possibilities for making the video content more searchable, browsable and understandable, thus greatly enriching the user's learning experience. Their usefulness has been demonstrated in the SLIC (Semantically Linking Instructional Content) system, which aims to turnsimple video content into fully interactive learning experience for students and scholars.
20
Raza, Muhammad Liaquat [Verfasser]. "Effects of small conductance calcium activated potassium channel agonists on seizure like events in in vitro slices and slice cultures / Muhammad Liaquat Raza". Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2017. http://d-nb.info/1140487043/34.
21
Scott, Maya Millicent. "Canine hepatic slices as a model for studying drug toxicity and metabolism". Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/3731.
Abstract (sommario):
Tissue slices can be made from organs, such as liver, kidney, brain, and heart, and from various species including humans, dogs, non-human primates, rats and mice. It has been demonstrated that human and rat liver slices are viable for up to 2 days, and liver slices have been extensively used as an in vitro method to study hepatic drug metabolism and toxicity in humans. The objective of this study was to determine the utility of canine hepatic slices as an in vitro model for studying drug metabolism and hepatotoxicity in dogs. Canine hepatic slices were incubated in media containing various drugs to determine the hepatotoxicity of the agents and the ability of the slices to metabolize the drugs. The toxicity of phenobarbital, primidone, lidocaine and carprofen to canine hepatic slices was assessed by determining changes in supernatant concentrations of potassium ions and adenosine triphosphate (ATP); histologic lesions were determined as necrosis, extent of vacuolation and severity of vacuolation. Xenobiotic drug metabolizing enzymatic activity was investigated by determining the metabolism of lidocaine to monoethylglycinexylidide (MEGX), and administration of phenobarbital plus primidone was used as a positive control for hepatotoxicity in dogs. The function of drug-metabolizing enzymes was demonstrated by the successful metabolism of lidocaine to MEGX. Carprofen, a drug which causes idiosyncratic hepatic disease in dogs, did not show any hepatotoxicity at concentrations of 10, 50 and 100 µg/ml using potassium ion levels, ATP concentrations and histology as indicators of hepatotoxicity. Slices incubated in media without drug showed no toxicity over 24 hours based on potassium ion and ATP supernatant concentrations while significant increases in histologic lesions were noted at 8, 12 and 24 hours. Canine hepatic slices were a useful model for examining drug metabolism and toxicity for up to 24 hours.
22
Hartrick, Elizabeth. "Consuming illusions : the magic lantern in Australia and Aotearoa/New Zealand 1850-1910 /". Connect to thesis, 2003. http://eprints.unimelb.edu.au/archive/00002203.
23
Attia, Emad N. "Hidden object reconstruction from acoustic slices". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq20815.pdf.
24
Wilkinson, Carole P. D. "Dehydration and rehydration of potato slices". Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481755.
25
Goodman, Daniel Francis Matthew. "Boundaries of slices of quasifuchsian space". Thesis, University of Warwick, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479236.
26
Webb, Simon Peter. "Central slices of the regular simplex". Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338771.
27
Hilditch, David Matthew. "Asymptotically null slices in numerical relativity". Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443029.
28
Henson, Megan D. "What Slides From the Pain Chamber". UKnowledge, 2016. http://uknowledge.uky.edu/english_etds/37.
29
Mills, Andrew James. "Peat slides : morphology, mechanisms and recovery". Thesis, Durham University, 2003. http://etheses.dur.ac.uk/1075/.
30
Smith-Ferguson, Jules Jack Andrew. "Such is slime: minimal cognition and brainless behaviour in the acellular slime mould Physarum polycephalum". Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/24643.
Abstract (sommario):
Cognition is often used to describe an underlying phenomenon that drives complex organismal behaviour. Cognitive behaviours tend to require information exchange between organism and environment. Memory and learning are the paradigmatic examples of cognitive behaviours. Cognitive behaviours can vary in complexity, and human cognition has historically been seen as the most complex. The only challengers to assumptions of human cognitive primacy are other animals. Hence, there is a brain-bias in our understanding of cognition; to be capable of cognitive behaviours, you must have a brain. The brain-bias seems intuitive, but to truly understand what advantages a brain gives an organism, we must also explore the cognitive (or cognitive-like) behaviours of brainless organisms.
In this thesis, I attempt to bridge the theoretical world of Philosophy of Biology with empirical study into the Behavioural Ecology of the brainless acellular slime mould Physarum polycephalum. Following the general introduction, I set up the notion of ‘minimal cognition’, which provides a framework for considering the complex behaviours of brainless organisms. The middle chapters explore the limits of slime mould memory and learning abilities: first, by testing its extracellular memory system in environments of increasing complexity; second, by testing whether the slime mould can learn to react differently to a stimulus over repeated exposures; and, finally, to test if the slime mould is capable of associative learning. The thesis ends with an exploration of how P. polycephalum, among other organisms, causes us to question notions of biological individuality, and what this means for the way we design and interpret experiments. Overall, the thesis represents a positive step forward in our understanding of how brainless behaviour can inform our conceptions of cognition and cognitive behaviour.
31
Pangaribuan, Darwin H. "Postharvest physiology of fresh-cut tomato slices /". [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19021.pdf.
32
Oztop, Mecit Halil. "Optimization Of Microwave Frying Of Potato Slices". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606536/index.pdf.
Abstract (sommario):
The main objective of this study is to evaluate the effects of microwave frying process on the quality of potato slices and to optimize the process by using different statistical optimization techniques.
Use of microwave frying for food products may be considered as a new way of improving the quality of the fried foods. In the first part of the study, the effects of microwaves on quality of fried potatoes (moisture content, oil content, color and hardness) were studied and the process was optimized by using Taguchi Technique. Microwave power level (400W, 550W and 700W), frying time (2.0, 2.5, 3.0 minutes) and oil type (sunflower, corn and hazelnut oil) were the parameters used in the study. Moisture content of potatoes decreased whereas oil content, hardness and Δ
E values of the potatoes increased with increasing frying time and microwave power level. The potatoes with the highest oil content were found to be the ones that were fried in the hazelnut oil. The optimum condition was found as frying at 550W microwave power level, for 2.5 minutes in sunflower oil. The potatoes that were fried at the optimum condition were determined to have lower oil contents compared to the ones fried conventionally.In the second part of the study, osmotic dehydration was applied prior to microwave frying process in order to reduce oil uptake and to evaluate the effect of osmotic dehydration with microwaves on quality of fried potatoes. The process was optimized by using both Taguchi Technique and Response Surface Methodology. Microwave power level (400W, 550W and 700W), frying time (1.5, 2.0, 2.5 minutes) and osmotic dehydration time (15, 30, 45 minutes) were the parameters used in the study. Osmotic dehydration treatment was conducted in a salt solution of 20 % (w/w) at 30oC. Moisture content decreased whereas oil content, hardness and &
#916
E value of potatoes increased with increasing frying time and microwave power level. Dehydration of potatoes osmotically prior to frying reduced the oil content of fried potatoes. The optimum condition was found as frying at 400 W microwave power level for 1.5 min after 30 min of osmotic dehydration time according to Taguchi Technique. Microwave power level and frying time were the same as Taguchi Technique but osmotic dehydration time was 39 min for the optimum condition found using response surface methodology.
33
Bouraoui, Moez Mohamed. "Microwave and convective drying of potato slices". Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29917.
Abstract (sommario):
Potato slices were dried using microwave drying, combined microwave and convective
drying, and convective drying. Drying conditions included several slice thicknesses,
power levels and air temperatures. The profiles of temperature, moisture content
and relative humidity, as well as shrinkage data were generated. Dried products were rehydrated and rehydration kinetics were determined.
In this study, drying characteristics of the different drying methods are discussed
and microwave drying is compared with convective drying. Microwave drying has a potential for producing better quality dried products while reducing considerably drying duration.
In addition, moisture diffusivity profiles were calculated by solving Fick's diffusion
model using the solution proposed by Crank (1975). Multiple regression analysis shows that calculated diffusivity correlates well with the internal temperature and moisture
content of the product.Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
34
McDonald, Clayton. "Slices of Surfaces in the Four-Sphere:". Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109128.
Abstract (sommario):
Thesis advisor: Joshua E. GreeneIn this dissertation, we discuss cross sectional slices of embedded surfaces in the four-sphere, and give various constructive and obstructive results, in particular focusing on cross sectional slices of unknotted surfaces. One case of note is that of doubly slice Montesinos links, for which we give a partial classification
Thesis (PhD) — Boston College, 2021
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Mathematics
35
Bäckström, Karl, e Andreas Linder. "Fault Tree Analysis of Quick Clay Slides". Thesis, KTH, Jord- och bergmekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299065.
Abstract (sommario):
Quick clay slides are quite rare but often leads to major consequences for the society. These type of slides are complex and the true causes leading to a slide is difficult to map since the evidence is destroyed during the slide. Because of this, different theories develop of the causes of the slide based on the same information. It is also problematic to back-calculate the sliding event because the commonly applied concept of perfectly plastic limite quilibrium cannot be applied on many of the landslides in quick clay. The objectives of this thesis were to construct a fault tree that facilitate risk identification and risk analysis of quick clay slides and to evaluate the applicability of the constructed fault tree, especially in the feasibility study and design phase. Uncertainties within the subject require a careful approach when dealing with quick clay. An implementation of a fault tree for quick clay slides in a risk management could reduce the risk of a slide and better understand the phenomenon. Two case studies were approached with the created fault tree and two advanced calculation methods that account for the special behaviour of quickclay. The use of a qualitative fault tree analysis in combination with calculation methods enables an evaluation of isolated singular events that in the end can lead to a quick clay slide. With the possibility to study isolated events, the implementation of more advanced calculation methods may be facilitated in an early stage to predict and prevent quick clay slides.Kvicklerskred är sällsynta men leder ofta till stor skada för samhället. Dessa skred är komplexa och orsaken till utlösandet av skredet är svårt att identifiera då bevisen förstörs under händelseförloppet. Detta leder till att olika teorier om orsaken av kvicklerskred kan variera från samma information. Det är också svårt att beräkna skredets omlopp i efterhand den vanliga beräkningsmetoden baseras på idealplastiska samband, något som inte går att applicera på kvicklera. Målet med denna studie var att konstruera ett felträd som underlättar riskidentifiering och riskanalyser av kvicklerskred. Målet var även att utvärdera användandet av felträdet i en byggnadsprocess, framförallt under förstudien och under projekteringsskedet. Osäkerheter inom området kräver en försiktig arbetsmetod när kvicklera finns i områden. Att använda sig av ett felträd för kvicklerskred i en riskhantering skulle kunna minska risken för ett skred och samtidigt öka systemförståelsen över fenomenet. Två fallstudier gjordes med det konstruerade felträdet, under dessa fältstudier gjordes även beräkningar med två avancerade beräkningsmetoder som tar hänsyn till det töjningsmjukande beteendet hos kvicklera. Användningav ett kvalitativt felträd i kombination med beräkningsmetoder möjligör en utvärdering av isolerade händelser som i slutändan kan leda till ett kvicklerskred. Möjligheten av att studera isolerade händelser kan underlätta en implementering av mer avancerade beräkningsmetoder i ett tidigt skede och på så vis förutse och förhindra kvicklerskred.
36
Griffiths, Rhiannon Cerys. "Slices of Globular Operads for Higher Categories". Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1623155240596704.
37
Al-Omeiri, Saeed S. "Leaching of copper-refined anode slime". Thesis, University of Strathclyde, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435125.
38
Sajikumar, Sreedharan. "Functional plasticity in the hippocampal slices in vitro". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975451642.
39
Nagle, Heather Kristen. "Folic debris slides near Prince Rupert, British Columbia". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ59856.pdf.
40
Charles, James John. "Image analysis of microscope slides for palynofacies studies". Thesis, Bangor University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505990.
41
Schreyer, Anna-Chi. "Charakterisierung des µ-Slides zur Analyse von Chemotaxis". Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-175309.
42
Nikbakht, Mohammad-Reza. "Aspects of purine receptor function in hippocampal slices". Thesis, University of Glasgow, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341711.
43
Ibrahim, N. A. A. "Electrophysiological and pharmacological studies on mammalian cerebral slices". Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374045.
44
Suárez, Trujillo Luis Carlos. "Securing network slices in 5th generation mobile networks". Thesis, Brest, 2020. http://www.theses.fr/2020BRES0050.
Abstract (sommario):
Le « network slicing » est la pierre angulaire pour la conception et le déploiement de services de communication à forte valeur ajoutée qui seront supportés par les nouveaux cas d’usage introduits par la nouvelle architecture 5G. Ce document souligne le défi que représente l’isolation des « network slices », et la gestion de sa sécurité en fonction des politiques retenues.Tout d’abord, un nouveau modèle de contrôle d’accès a été créé. Il permet de sécuriser les interactions entre les fonctions réseaux supportées par les systèmes 5G. Ensuite, la gestion des interactions entre les «network slices » a été abordée. On utilise le concept de chaînes de « network slices », qui seront mises en oeuvre après validation des contraintes de sécurité selon la politique choisie. Enfin, une méthode de quantification de l’isolation a été mise au point, permettant de connaître le degré d’isolation d’un service de communication offert via des « network slices». Cela permet aux opérateurs de réseau et aux clients de mesurer le degré d’isolation, puis d’améliorer la configuration des « network slices » afin de le renforcer. Ces éléments établissent un cadre solide contribuant à sécuriser, verticalement, les services de communication d’un réseau 5G et à évaluer le degré de sécurité en ce qui concerne leurs interactions et leur isolationNetwork slicing is a cornerstone in the conception and deployment of enriched communication services for the new use cases envisioned and supported by the new 5G architecture.This document makes emphasis on the challenge of the network slicing isolation and security management according to policy. First, a novel access control model was created, that secures the interactions between network functions that reside inside the 5G system. Then, the management of the interactions between network slices was addressed. We coin the concept of network slice chains, which are conceived after security constraint validation according to policy. Lastly, a method to quantify isolation was developed, permitting to find out how well isolated a communication service is, which is offered via network slices. This enables network operators and customers to measure the isolation level and improve the configuration of the network slices so the isolation level can be enhanced. These components establish a solid framework that contributes to secure, vertically, the communication services of a 5G network and assess how secure they are with respect to their interactions and isolation
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Curras, Margarita Concepcion. "Transduction mechanisms of thermosensitivity in hypothalamic tissue slices /". The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu148766821580516.
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Mayall, Stephen James. "Cyclins in the slime mould Dictyostelium discoideum". Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243862.
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Harris, William B. "The geologic history of Rock Canyon, Utah : a virtual trip /". CLICK HERE for online access, 2002. http://www.geology.byu.edu/faculty/rah/slides/Rock%20Canyon/Home.htm.
Abstract (sommario):
Thesis (M.S.)--Brigham Young University. Dept. of Geology, 2002.Web site works as of 02/10/03. Consult BYU Dept of Geology for URL changes in future. Includes bibliographical references (leaves 8-9). Also available via Internet.
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Marlow, Gregory. "Week 01, Video 06: Maya UI Time Slider and Range Slider". Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/digital-animation-videos-oer/11.
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Zeller, Rüdiger [Verfasser]. "Branching Dynamical Systems and Slices through Fractals / Rüdiger Zeller". Greifswald : Universitätsbibliothek Greifswald, 2015. http://d-nb.info/1075601479/34.
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Davila, Rosa Fabiana Zabalaga. "Mathematical modeling of drying process of unripe banana slices". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-29062016-155701/.
Abstract (sommario):
Unripe banana flour (UBF) production employs bananas not submitted to maturation process, is an interesting alternative to minimize the fruit loss reduction related to inappropriate handling or fast ripening. The UBF is considered as a functional ingredient improving glycemic and plasma insulin levels in blood, have also shown efficacy on the control of satiety, insulin resistance. The aim of this work was to study the drying process of unripe banana slabs (Musa cavendishii, Nanicão) developing a transient drying model through mathematical modeling with simultaneous moisture and heat transfer. The raw material characterization was performed and afterwards the drying process was conducted at 40 ºC, 50 ºC e 60 ºC, the product temperature was recorded using thermocouples, the air velocity inside the chamber was 4 m·s-1. With the experimental data was possible to validate the diffusion model based on the Fick\'s second law and Fourier. For this purpose, the sorption isotherms were measured and fitted to the GAB model estimating the equilibrium moisture content (Xe), 1.76 [g H2O/100g d.b.] at 60 ºC and 10 % of relative humidity (RH), the thermophysical properties (k, Cp, ?) were also measured to be used in the model. Five cases were contemplated: i) Constant thermophysical properties; ii) Variable properties; iii) Mass (hm), heat transfer (h) coefficient and effective diffusivity (De) estimation 134 W·m-2·K-1, 4.91x10-5 m-2·s-1 and 3.278?10-10 m·s-2 at 60 ºC, respectively; iv) Variable De, it presented a third order polynomial behavior as function of moisture content; v) The shrinkage had an effect on the mathematical model, especially in the 3 first hours of process, the thickness experienced a contraction of about (30.34 ± 1.29) % out of the initial thickness, finding two decreasing drying rate periods (DDR I and DDR II), 3.28x10-10 m·s-2 and 1.77x10-10 m·s-2, respectively. COMSOL Multiphysics simulations were possible to perform through the heat and mass transfer coefficient estimated by the mathematical modeling.A farinha de banana verde (UBF) produzida de bananas não submetidas ao processo de maturação é uma alternativa interessante para minimizar as perdas dos frutos relacionadas ao manejo inadequado e a alta perecibilidade do produto. A UBF pode ser considerada um ingrediente funcional em formulações alimentícias, pois pode reduzir o índice glicêmico e o nível de insulina plasmática no sangue, demonstrando eficácia no controle da saciedade e da resistência à insulina. O objetivo deste trabalho foi estudar o processo de secagem de fatias de banana verde (Musa cavendishii, Nanicão) e desenvolver um modelo de secagem transiente através da modelagem matemática com transferência de massa e energia simultânea. Inicialmente, foi realizada a caraterização físico-química da matéria prima que foi submetida ao processo de secagem em escala piloto, a 40 ºC, 50 ºC e 60 ºC, com termopares inseridos no produto monitorando sua temperatura, a velocidade do ar de secagem foi de 4 mos-1. Com a cinética de secagem e a temperatura interna da fatia foi possível validar o modelo de difusão baseado na 2a Lei de Fick e Fourier. Para este propósito, foram medidas durante o processo: as isotermas de sorção ajustadas ao modelo do GAB permitindo estimar a umidade de equilíbrio (Xe), 1.76 [g H2O/100g d.b.] a 60 ºC e 10 % de umidade relativa (RH) e as propriedades físicas e termofísicas (k, Cp, ?) para serem inseridas no modelo. Consideraram-se cinco casos: i) Propriedades termofísicas constantes; ii) Variáveis; iii) Estimativa do coeficiente de transferência de massa (hm) de calor (h) e difusividade efetiva (De) parâmetros importantes que controlam a taxa de secagem, 134 Wom-2oK-1, 4.91x10-5 m-2os-1 e 3.278x10-10 mos-2 para uma temperatura de 60 ºC, respectivamente; iv) Estimativa do De como função do teor de umidade (M) apresentando um comportamento polinomial de terceira ordem; v) O encolhimento teve influência no modelo matemático, em especial nas primeiras três horas de secagem, a espessura da banana verde experimentou uma redução de (30.34 ± 1.29) %, encontrando dois períodos de taxa de secagem decrescentes (DDR I e DDR II), os De estimados para estes dois períodos foram 3.28x10-10 mos-2 e 1.77x10-10 mos-2, respectivamente. As simulações no COMSOL Multiphysics foram possíveis de serem realizadas através dos dados estimados pelo modelo matemático.