Tesi sul tema "Powder in suspension"
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Lewis, Paul O., David B. Cluck, Jessica D. Huffman, Amanda P. Ogle e Stacy D. Brown. "Stability of a Pyrimethamine Suspension Compounded from Bulk Powder". Digital Commons @ East Tennessee State University, 2017. https://doi.org/10.2146/ajhp160551.
Wattieaux, Gaëtan. "Détection et métrologie de nanoparticules en suspension dans un plasma froid basse pression". Thesis, Orléans, 2010. http://www.theses.fr/2010ORLE2080.
The recent development of nanotechnology has made nanoparticle sizing more and more important for the quality of manufactured products as well as for human health and environmental protection. The aim of this thesis was to look for innovative solutions to measure the size and the concentration of nanoparticles in dry environnement. To meet this requirement we focused on the physics of dusty plasmas because the desagglomeration of a powder sample is enhanced when it is exposed to a plasma and the dusts modify signifcantly the electrical properties of the plasma where they are trapped. The first result of this work is the determination of the mean size of dusts that are injected or formed in a RF low pressure capacitive discharge from the variations of the electrical parameters of the plasma and of the discharge. A new particle sizing technique has also been developed. It consists of determining the powder size distribution from the measurement of its sedimentation speed following the extinction of the discharge. The system that has been designed was successfully used to monitor in real time a nanopowder production line based at the CEA Saclay
De, Villiers Janene Oosthuizen. "Combination antiretroviral therapy : formulation of a powder for oral suspension containing Lamivudine, Zidovudine and Nevirapine / Janene Oosthuizen de Villiers". Thesis, North-West University, 2006. http://hdl.handle.net/10394/15.
Ravaux, Alice. "Réalisation et étude de dépôts composites multi-échelle élaborés par projection plasma pour applications tribologiques à hautes températures". Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0077/document.
Nowadays, tribology has a high energetic impact on economic and industrial areas. Thus, reducing wear and friction of mechanical parts has become a real stakes for various industries. This study is focused on the wear prevention of mechanical parts subjected to severe operating conditions like high temperatures.The realization of protective ceramic-metal coatings is thus particularly appropriated to improve corrosion resistance induced by the high temperatures, with a suitable alloy, and the wear resistance, thanks to the ceramics hardness. Furthermore, researches development in the nanoscale field have shown the interest of scale reduction on the improvement of coatings tribological properties. Thermal spraying is then the most appropriate process for the realization of such coatings.In this work, multi-components (ceramic-metal) and multi-scales (micrometric-nanometric) coatings are developed by plasma spraying in order to give an answer to the high temperature tribological resistance issue. Coatings are realized using a three-cathodes plasma gun (TriplexPro-200) which provides a more stable plasma jet and offers wide possibilities by an extended operating window. First, the special features of this kind of plasma gun will be studied in order to adjust the process to the complex realization of multi-scale coatings. An innovative approach using a hybrid spraying process was thus developed, combining conventional micrometric powder spraying and suspension of nanoscale powders spraying. In a second time, the steps leading to the production of such coatings will be detailed, and finally, their main properties and their tribological behavior will be studied
Boissière, Benjamin. "Étude hydrodynamique et thermique d'un nouveau concept de récepteur solaire à suspensions denses gazparticules". Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/13944/1/boissiere.pdf.
Machado, Jaison Carlosso. "Desenvolvimento e controle de qualidade de micropartículas poliméricas contendo praziquantel para o tratamento pediátrico da esquistossomose". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/181180.
Schistosomiasis is a parasitic disease acute and chronic caused by blood worms (nematodes worms) of the genus Schistosoma. Man acquires schistosomiasis through the active penetration of the worms in skin. The importance of treatment of this disease is not only the fact of curing the disease or decreases the parasite load of patients, well as prevent progression to more severe forms. For the treatment of schistosomiasis praziquantel is the drug of choice, this is due to its wide spectrum, its efficacy, safety and the relation cost / treatment. The single dosage form available in Brazil is tablet at a dose of 600 mg, which can be subdivided into four parts of 150 mg to facilitate dose adjustment. However when the subdivision of the tablets occurs the disruption of the coating. This fact provides a drug exposure and consequently of its bitter taste. This characteristic complicates the administration of the drug mainly in children, affecting the treatment and control of disease. An alternative for this problem is the development of microparticulate polymeric systems which associated with the drug would prevent direct contact with the taste buds and thus promote an improvement in palatability. For this was used a modified technique interfacial deposition of preformed polymer followed by spray drying. Three polymer matrices with different release characteristics have been used, Eudragit RL 100 – time dependent release, and Eudragit E100 and L30D-55 – pH dependent release. Furthermore, two types of drug carrier systems have been prepared, polymeric microspheres and microcapsules. These systems obtained were evaluated and characterized in order to select the best proposal formulation aimed at masking the taste of the drug. According to the results we selected a system comprising microcapsules formed from L30D-55 polymer. From then was inserted into this system in the pharmaceutical form, powder for oral suspension, where different proposals formulations containing two auxiliary sweeteners, aspartame and saccharin, separately, and their respective placebos were evaluated in an in vitro method for determining the taste, the electronic tongue. The different formulations tested presented excellent ability to mask the unpleasant taste of the drug and thus present an excellent alternative for increasing adherence to therapy, especially for children, because of the ease of administration, according on dose adjustment of body mass and the much more palatable to children's taste.
Catalot-Martinent, Valérie. "Étude de suspensions ciment alumineux-eau : corrélations rhéologie-granularité-compacité". Grenoble INPG, 1997. http://www.theses.fr/1997INPG4209.
Tiabi, Nadia. "Synthèse de préformes dopées ytterbium par voie poudre pour la réalisation des lasers à fibre de haute puissance". Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0049.
The work presented in this manuscript is part of a PhD thesis carried out by CIFRE in collabora-tion between the laboratory of Xlim and the technological center of optics and lasers "ALPhA-NOV". The main objective of this thesis is to design ytterbium doped preforms that are resistant to the photodarkening (PD) phenomenon for use in high power laser applications.This phenomenon degrades laser performance and leads to reduced output. Two main areas are focused in this thesis. The first is the definition of the core composition and the appropriate synthesis method for the production of preform cores which are resistant to photodarkening (PD). The second is to develop, characterize and evaluate the optical performance of the resulting fiber. The matrix that has been chosen for the study is the alumino-phosphosilicate matrix. To obtain this matrix, a synthesis method called "powder in suspension" was used.From the synthesis of the preform to the drawing of the optical fiber, the different stages of the process have been validated. Excellent performance, with low attenuation of 0.1 dB/m and a very promising optical-to-optical conversion efficiency of 76%, was obtained from the optical tests performed on the fiber. The evaluation of the fiber against photodarkening showed an exceptional resistance. No performance degradation was observed over 100 hours
Azimi, Mandana. "EVALUATION OF THE REGIONAL DRUG DEPOSITION OF NASAL DELIVERY DEVICES USING IN VITRO REALISTIC NASAL MODELS". VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4780.
Mortazavi, Ramin. "Simulation of fine powder suspensions". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0015/MQ53593.pdf.
Stocky, Robin. "Etude du traitement de poudres et influence des caractéristiques obtenues sur la transparence de céramiques du type spinelle". Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2020. http://www.theses.fr/2020UPHF0015.
This work aims to elaborate the benefits of transparent ceramics in ballistic protection systemswhich are employed by the military in their vehicles. The main focus lies on improving bothoptical and mechanical properties as well as reducing the weight of the system as a whole.Substituting the standard multilayered front glass panel with a polycrystalline ceramic, suchas the spinel MgAl2O4 used in this work, considerably improves its ballistic performance, whilesimultaneously reducing its mass and volume. In order to achieve these improved properties,which most commonly result from a fine-grained microstructure, a very fine grained andreactive powder is used. However, the use of such powders raises additional difficulties inshaping and homogeneous sintering, all of which have a negative effect on the transparency ofthe ceramic. The first focus of this study is the selection of an appropriate powder, carried outby comparison of multiple commercially available powders. This following step highlightedthe rheological and morphological particularities of the examined powders, necessary for theshaping of ceramics, and influencing the sintering and thus the final transparency, such asgranular rearrangement, specific surface area or permeability. Once the spinel powder hadbeen chosen, a processing study was carried out on it, exploiting its agglomeration to obtain avisibility transparent ceramic with a fine microstructure. Since some nanopowders presentedwith difficulties in shaping, further optimization of different treatment methods (use of afreeze dryer, an oven or a spray dryer) in combination with appropriate sintering approacheswere explored. Ultimately, by combining a spray dryer and a PEG additive, the study resultedin the production of a transparent spinel ceramic with a fine microstructure (grain size of4-5 µm) and an in-line transmission of 71% at 650 nm. A parallel study on strengtheningthe transparent spinel by introducing various additives, such as nanodiamond, alumina, andzirconia was also carried out. The primary objective was to improve the mechanical propertiesof the spinel, while keeping its optical properties untouched. The addition of a secondaryphase as reinforcement raised many difficulties, mainly due to the size disparity, differentrefractive index of the spinel and potential unwanted reactions that can occur during sintering.Lastly, the final study focused on complex shaping of spinel ceramics for ballistic protection.As a prerequisite, a complete examination of the spinel’s suspension and its behaviour duringshaping had to be performed. The new findings validated liquid shaping as a viable solutionto achieve transparent 3D profiles, while the classic uniaxial pressing route did not yield anyconclusive results. Each of the studies was based on the morphology of the powder and itsevolution during shaping and sintering. The results were obtained through microstructuraland rheological studies as well as the evaluation of optical and mechanical properties
Quartaroli, Matheus Mikael. "Análise dinâmica de um sistema de atuação eletromecânica em mecanismo de suspensão mecânica para isolamento de vibrações". Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153314.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Esse trabalho buscou investigar os comportamentos dinâmicos de uma suspensão eletromecânica. Para a configuração dessa suspensão substitui-se o amortecedor viscoso convencional por um amortecedor do tipo eletromecânico. O amortecedor eletromecânico é formado por um transdutor de imã permanente e bobina móvel, no qual se acopla ao sistema mecânico com o eletromagnético. Nos terminais da bobina é introduzido um circuito elétrico RLC ligados em série. Para modelagem e a obtenção das equações dinâmica que descrevem seu movimento utilizou-se o método de Lagrange, que utiliza expressões de energia. Os modelos abordam absorvedores utilizados na indústria automobilística. No trabalho, primeiramente foi investigado a capacidade dos parâmetros elétricos no comportamento do sistema, e verificou-se a influência que a resistência elétrica e a capacitância tem em relação ao deslocamento da massa suspensa de um veículo. Foi realizada, através da função transferência, uma análise da quantidade de energia obtida no sistema elétrico para valores diferentes de resistência elétrica e em comparação foi verificado o ganho da massa suspensa para um movimento harmônico sofrido pela base. Por fim, investigou-se as potências geradas no circuito elétrico e o fator de potência para diferentes valores de capacitância. E também apurou a influência da resistência elétrica na produção de potência ativa. Os resultados mostraram a influência dos parâmetros elétricos no comportamento dinâmico do sistema e na geração de potência elétrica, assim através de um controle feito nesses parâmetros pode-se encontrar faixas no qual reduz a transmissibilidade de deslocamento para os ocupantes de um veículo e geram uma alta potência elétrica em que possa ser armazenada e utilizada posteriormente.
This work sought to investigate the dynamic behavior of an electromechanical suspension. For the configuration of this suspension it replaces the conventional viscous damper with a shock absorber of the electromechanical type. The electromechanical damper is formed by a permanent magnet transducer and mobile coil, in which it couples the mechanical system with the electromagnetic. At the terminals of the coil is introduced an RLC electric circuit connected in series. For the modeling and the obtaining of the dynamic equations that describe its movement was uses the Lagrange method, that uses expressions of conservation of energy. The models approach in a simplified way the absorbers used in the automotive industry. In the work, it was first investigated the influence of the electrical parameters on the behavior of the system, it was verifies the power of the electrical resistance and the capacitance have in relation to the displacement of the suspended mass of a vehicle. It was performed, through the transfer function, an analysis of the amount of energy obtained in the electrical system is performed for different values of electrical resistance and in comparison it was verifies the gain of the suspended mass for a harmonic movement suffered by the base. Finally, we investigated the powers generated in the electric circuit and the power factor for different capacitance values. It also determined the influence of electrical resistance on the production of active power. The results showed the influence of the electrical parameters on the dynamic behavior of the system and the generation of electric power, so through a control made in these parameters can be found tracks in which reduces the transmissibility of displacement for the occupants of a vehicle and generate a high electrical power where it can be stored and used later.
Reinfried, Matthias. "Herstellung und Eigenschaften neuartiger, metallischer Polyederzellstrukturen". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-62031.
Williams, Richard Andrew. "Electrochemical behaviour of ferrosilicon suspensions". Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47302.
Barg, Suelen [Verfasser]. "Cellular Ceramics via Alkane Phase Emulsified Powder Suspensions / Suelen Barg". Aachen : Shaker, 2010. http://d-nb.info/1081886919/34.
Jomha, A. I. "The power requirements for mixing concentrated solid/liquid suspensions". Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376348.
Clarenc, Nathalie. "La suspension des engagements internationaux". Thesis, Paris 2, 2015. http://www.theses.fr/2015PA020057.
This study focuses on a mechanism frequently used in legal practice, but, surprisingly, often ignored in international doctrine: suspension. The mechanism of suspension is to be distinguished from more radical, but arguably less interesting mechanisms, such as revocation. Suspension will be analysed within the context of both conventional and unilateral international law commitments. For the first time, a general definition of suspension will be proposed, which sets it apart from the many similar notions with which it has been confused, such as dispense, exception of inexecution, force majeure, countermeasures, reservations, …, and last but not least, denunciation and withdrawal. The proposed definition also aims to identify characteristics that are unique to suspension, as shown in treaty clauses, in diplomatic practice and case law, and as supported by « commitment theory ». The study will also clarify the legal regime of suspension, which, according to Fitzmaurice, involves « serious difficulties of classification and content ». Indeed, a closer look at suspension in practical terms reveals that there are not one, but two legal regimes of suspension. This eye-opening conclusion will not fail to engage the reader’s interest and will contribute to our further understanding of the phenomenon of suspension
Wright, Derek Thomas. "Magnetic suspension systems, motor/generators and power electronics for flywheel energy storage". Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412659.
NETO, RICARDO TEIXEIRA DA COSTA. "GROUND VEHICLES SUSPENSION AND STEERING MECHANISMS MODELING AND INTEGRATION THROUGH POWER FLOW". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12403@1.
A sub-divisão de um veículo em módulos é muito útil quando se quer estudar o comportamento dinâmico de um determinado subsistema e sua influência nos demais componentes. Em alguns casos, devido ao tipo de tratamento empregado para descrever os elementos, não se consegue perceber de que modo as variáveis inerentes a um subsistema interagem com as demais, e, por conseguinte, os subsistemas entre si. A abordagem modular baseada no fluxo de potência permite uma melhor identificação das relações de causa e efeito entre subsistemas, uma vez que se pode definir, de forma clara e consistente, quem são as variáveis de entrada e de saída de cada componente ou módulo, e, conseqüentemente, seus acoplamentos. Neste tipo de tratamento, aplicado aos sistemas mecânicos, uma vez estabelecida a cinemática de um subsistema, podese obter as relações entre os esforços que seus componentes produzem uns sobre os outros, a partir da caracterização da potência transmitida através dos seus diversos elementos. Este trabalho apresenta um procedimento semi-analítico de equacionamento modular aplicado à modelagem e integração dos sistemas de suspensão e direção de veículos terrestres, no qual as variáveis de entrada e saída indicam o fluxo de potência entre os elementos de todo o sistema. Tal abordagem tem como base a técnica dos Grafos de Ligação, empregada em sistemas multidomínio em geral, e usa alguns conceitos da metodologia dos Transformadores Cinemáticos, normalmente aplicada aos sistemas multicorpos. A partir da definição da geometria dos mecanismos em questão, encontram-se as matrizes que representam os vínculos cinemáticos entre seus elementos, das quais o funcionamento dos sistemas integrados pode ser simulado e analisado, e informações necessárias aos seus projetos determinadas. As equações (malhas) algébricas que existem em mecanismos com estrutura cinemática fechada são analiticamente resolvidas, evitando deste modo modelos matemáticos com equações diferenciais e algébricas simultâneas. Das relações cinemáticas, o modelo dinâmico (matrizes de inércia, rigidez e amortecimento, etc) é obtido, e novamente informações essenciais à análise e síntese dos sistemas podem ser determinadas. O comportamento no tempo desses modelos pode ser encontrado por um método de integração de equações diferenciais qualquer. Adota-se o Simulink/MatLab® para representar o modelo assim desenvolvido em diagrama de blocos, e conseqüentemente simulá-lo. Através deste tratamento, cada bloco da implementaçao em Simulink/MatLab® contém o correspondente modelo analítico de um único módulo, cujo estabelecimento depende das características dinâmicas do sistema que se deseja analisar. A vantagem de adotar tal representação, baseada no fluxo de potência, consiste no fato de que um módulo pode ser substituído por outro, descritivo de um elemento ou subsistema com a mesma função, porém com configuração física distinta, e, conseqüentemente, modelo matemático específico, sem qualquer alteração nos demais componentes do sistema. Este procedimento está sendo adotado para modelagem dos diversos sistemas veiculares, como os de suspensão, direção, transmissão e freios, e também os pneus, inseridos em um chassi, incluindo os graus de liberdade desejados do veículo, todos descritos de forma modular semi- analítica através da mesma abordagem, empregando a técnica de modelagem mais apropriada para representá-los.
The sub-division of a vehicle in modules is very useful when we want to study the dynamical behavior of a certain sub-system and its influence in other components. In some cases, due to the type of treatment employed to describe the dynamic behavior of the elements, we don`t get to notice the way that inherent variables in a sub-system interacts with the others, and, consequently, the subsystems amongst themselves. The modular approach based on the power flow allows a better identification of the causal relationships among sub-systems, once it can define, in clear and consistent way, what are the input and output variables of each component or module, and, consequently, their couplings. In this type of treatment applied to the mechanical systems, once established the kinematics of a sub-system, it can be obtained the relationships among the efforts that their components produce on the other ones, from the characterization of the power transmitted through their several elements. This paper presents a semi-analytical procedure of modular modeling applied to the suspension and steering systems of a ground vehicle, in which the input and output variables indicate the power flow among the elements of the whole system. Such approach has as base the Bond Graphs technique, used in multidomain systems in general, and uses some concepts of the Kinematic Transformers methodology, usually applied to the multibody systems. From the mechanisms geometry, the matrices that represent the kinematics links between its elements are found, the operation of the integrated systems can be simulated and analyzed, and information about its design can be obtained. The algebraic loops (equations) inherent to mechanisms with closed kinematic structure are solved analytically, and there is not a mathematical model with simultaneous algebraic and differential equations. From the kinematic relations, the dynamic model (inertial, stiffness and damping matrices) is obtained, and again essential information to the systems analysis and synthesis can be determined. The models time behavior can be found by any differential equations integration method. The Simulink/Matlab is adopted to represent the model developed by block diagrams, and consequently to simulate it. Through this treatment, each block in the Simulink/Matlab implementation contains the correspondent analytical model of a single module, whose establishment depends on the dynamic characteristics of the system to be analyzed. The advantage of adopting such representation, based on the power flow, consists in the fact that a module can be substituted for other, descriptive of an element or sub-system with the same function, however with different physical configuration, and, consequently, specific mathematical model, without any alteration in the other components of the system. This procedure is being adopted for modeling all vehicular systems, like the suspension, steering, transmission and brakes systems, and also the tires, inserted in the chassis, including the desired degrees of freedom of the vehicle, all described in a semi- analytical modular way by the same approach, using the most appropriate modeling technique to represent them.
Wang, Yingzhe. "The Characterization of Dry Powder Magnesium Hydroxide Suspensions Using Sedimentation, Thermal Analysis and Other Techniques". University of Toledo Health Science Campus / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=mco1322075364.
Gulsun, Kilic Mehtap. "A Parametric Comparative Study Of Electrocoagulation And Coagulation Of Aqueous Suspensions Of Kaolinite And Quartz Powders". Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611458/index.pdf.
electrocoagulation with aluminum anode and conventional coagulation with aluminum sulfate. Several key parameters affecting the efficiency of electrocoagulation and coagulation were investigated with laboratory scale experiments in search of optimal parameter values. Optimal values of the parameters were determined on the basis of the efficiency of turbidity removal from ultrafine suspensions. The parameters investigated in the study were suspension pH, electrical potential, current density, electrocoagulation time, and aluminum dosage. This study was also performed to compare electrocoagulation and conventional coagulation regarding the pH ranges under investigation and coagulant dosages applied. A comparison between electrocoagulation and coagulation was made on the basis of total dissolved aluminum, revealing that electrocoagulation and coagulation were equally effective at the same aluminum dosage for the removal of ultrafine particles from suspensions. Coagulation was more effective in a wider pH range (pH 5-8) than electrocoagulation, which yielded optimum effectiveness in a relatively narrower pH range around 9. In both methods, these pH values corresponded to near-zero zeta potentials of coagulated kaolinite and quartz particles. The mechanism for both coagulation methods was aggregation through charge neutralization and/or enmeshment in aluminum hydroxide precipitates. Furthermore, the experimental results confirmed that electrocoagulation could display some pH buffering capacity. The kinetics of electrocoagulation was very fast (<
10 min) in approaching a residual turbidity, which could be modeled with a second-order rate equation.
Bozier, Olivier. "Contribution à l'étude des caractéristiques de combustion isochore d'une suspension de particules solides réactives.Génération de la suspension ; influence de l'état initial du mélange". Phd thesis, Université de Poitiers, 2004. http://tel.archives-ouvertes.fr/tel-00133153.
On étudie, en premier lieu, les mécanismes de génération d'une suspension de particules solides. Un montage spécifique a été réalisé, comprenant une chambre cylindrique transparente de section octogonale et de faible allongement (V=20l, L/D≡2,2). La dispersion des particules s'opère au moyen d'un écoulement turbulent créé par la décharge d'un réservoir auxiliaire. Les expériences ont été effectuées avec des mélanges amidon-air de concentrations inférieures à 400g/m3. Les enregistrements, par imagerie rapide, LDV et PIV, de l'évolution au cours du temps de l'état aérodynamique du milieu et de la répartition des particules dans l'enceinte indiquent que le délai nécessaire pour obtenir un mélange optimal (vitesse et intensité de turbulence minimales, concentration quasi-homogène) est compris entre 500 et 700ms.
On étudie, ensuite, les caractéristiques de combustion isochore de ces suspensions dans une chambre d'explosion de caractéristiques géométriques similaires à celle de l'enceinte précédente pouvant supporter des pressions de 50bar. A la richesse 1, la pression maximale d'explosion est de 5,8bar et la vitesse de combustion de 48cm/s. Ces valeurs diminuent lorsque l'intensité de turbulence initiale décroît.
Brötz, Nicolas, Manuel Rexer e Peter F. Pelz. "Fluid dynamic vibration absorber for cabin suspension". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71227.
Tsuboi, Chiaki. "X-ray crystal structure analyses of magnetically oriented microcrystalline suspensions". Kyoto University, 2016. http://hdl.handle.net/2433/216190.
0048
新制・課程博士
博士(農学)
甲第19936号
農博第2186号
新制||農||1044(附属図書館)
学位論文||H28||N5009(農学部図書室)
33022
京都大学大学院農学研究科森林科学専攻
(主査)教授 木村 恒久, 教授 西尾 嘉之, 教授 髙野 俊幸
学位規則第4条第1項該当
Laarz, Eric. "Colloidal Processing of Non-Oxide Ceramic Powders in Aqueous Medium". Doctoral thesis, Stockholm : Tekniska högsk, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3043.
Marschall, Christoph [Verfasser], e Wolfgang [Akademischer Betreuer] Frieß. "Powder suspensions in non-aqueous vehicles for delivery of therapeutic proteins / Christoph Marschall ; Betreuer: Wolfgang Frieß". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1225682525/34.
Park, Hyunjin. "Spheroidized nano [alpha]-tricalcium phosphate powders using Suspension Induction Plasma Synthesis (SIPS) for bone cement applications". Mémoire, Université de Sherbrooke, 2007. http://savoirs.usherbrooke.ca/handle/11143/1405.
Wang, Gonghou. "Ionic stability of oxide particles in polar organic media /". *McMaster only, 1998.
Chiang, Mao-Hsiung, Yung-Ching Sung e Han-Hsiang Liu. "A Study on Integration of Energy Harvesting System and Semi-Active Control for a Hydraulic Suspension System". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199913.
Bauer, Wolfgang. "Hydropneumatic all-wheel suspensions: applications, challenges and special solutions". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71226.
Duke, M. D. "Investigation into low power active elements in vehicle suspensions, with particular reference to tractor seats". Thesis, London South Bank University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618646.
Benoit, Hadrien. "Récepteur solaire tubulaire à suspension dense de particules en écoulement ascendant". Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0045/document.
This thesis, financed in the frame of the CSP2 European project, concerns the study of a new kind of thermal concentrating solar receiver using a dense suspension of solid particles circulating upward in vertical tubes. The suspension is obtained by fluidizing Geldart A-type particles. The principle consists in creating an upward flow of the suspension in a vertical tube exposed to the concentrated solar radiation that heats the tube wall. The heat is then transmitted to the particles circulating inside that transport it to a conversion cycle for electricity production. Contrarily to usual solar heat transfer fluids, particles can reach high temperatures (> 700 °C) that permit to power high efficiency thermodynamic cycles such as Brayton or combined cycles. Moreover they can be used as a direct heat storage medium for continuous electricity production. During this thesis, a one-tube solar receiver was successfully tested at the PROMES-CNRS solar furnace in Odeillo, with particle outlet temperatures of 750 °C reached. The first values of wall-to-suspension heat transfer coefficient were calculated and a Nusselt correlation was determined. A specific flow pattern with a particle downward flux close to the wall and upward flux in the tube center was underlined. The flow hydrodynamics and the heat transfer mechanisms were studied thanks to 3D numerical simulations. A 16-tube 150 kWth receiver was finally tested and modeled, proving the process applicability at larger scale
Lomello, Fernando. "Optimization of nanostructured oxide-based powders by surface modification". Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0028/these.pdf.
Rexer, Manuel, Nicolas Brötz e Peter F. Pelz. "Much does not help much: 3D pareto front of safety, comfort and energy consumption for an active pneumatic suspension strut". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71215.
Correll, Eric Owen. "Design of a rapid, continuous, small-scale device for creating dry powders from concentrated suspensions containing active pharmaceutical ingredients". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/68832.
"February 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 14).
Current methods of producing pharmaceutical compounds are large batch processes. The minimum time-to-patient for drug manufacturing is approximately 100 days. Using a continuous manufacturing process, the time-to-patient could be reduced to less than ten days. The scope of this paper encompasses the design of a machine for the desiccation of a mixture of solvent and pharmaceutical compound. The goal of this project was to provide a small-scale, high throughput method of continuous pharmaceutical drug drying for Novartis-MIT Center for Continuous Manufacturing. Specifications included a product flow rate of 100 grams per hour and a final product form of flowable powder. Several machines were built and tested, with the final design being comprised of a convective drum dryer and a modular continuous vacuum dryer.
by Eric Owen Correll.
S.B.
Stoquart, Céline. "Performance of aged PAC suspensions in a hybrid membrane process for drinking water production". Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209254.
Le principal objectif de ce projet de recherche est de décrire la performance du contacteur à CAP du PMH pour l’enlèvement de l’azote ammoniacal, du carbone organique dissous (COD), du COD biodégradable (CODB) et des micropolluants. Dans ce projet, l’emphase est placée sur l’opération du PMH avec de hauts temps de rétention de CAP.
La première phase de ce projet a consisté en une série de développements méthodologiques, base nécessaire à l’étude du CAP âgé. Des méthodes permettant la quantification de la biomasse hétérotrophe et nitrifiante colonisant le CAP âgé ont mis en évidence des densités de biomasse similaires à celle du charbon actif en grain en surface de filtre biologiques. L’irradiation aux rayons gamma a été démontrée comme une méthode adéquate pour produire des témoins abiotiques à partir de CAP de 10 et de 60 jours.
La seconde partie de cette étude s’est concentrée sur la démonstration de l’efficacité du PMH pour l’enlèvement de l’azote ammoniacal, du COD, ainsi que d’un mélange de micropolluants. Les cinétiques d’enlèvements ayant lieu au sein de des contacteurs à CAP ont été simulées en laboratoire sous diverses conditions (température, concentration en CAP, âge de CAP, matrice d’eau variable, temps de contact). Deux modèles cinétiques prédisant l’enlèvement de l’azote ammoniacal et du COD dans le PMH ont été développés sur base des simulations en laboratoire suivies sur CAP neuf, colonisé et abiotique.
De manière générale, les travaux réalisés au cours de ce doctorat ont mis en évidence le rôle majeur de l’adsorption résiduelle sur l’enlèvement de la contamination dissoute. Alors que l’enlèvement d’azote ammoniacal a majoritairement eu lieu par nitrification, le COD et les micropollutants sont principalement adsorbés sur le CAP colonisé. Il a aussi été montré que la capacité d’adsorption résiduelle des suspensions de CAP âgées peut agir en tampon, permettant de faire face à une augmentation soudaine de la concentration en azote ammoniacal, en COD ou en micropolluants. Le suivi des cinétiques d’enlèvement a permis de démontrer que la concentration, l’âge de CAP et le temps de rétention hydraulique (TRH) sont trois paramètres clefs pour l’optimisation du procédé. D’un point de vue économique, un TRH inférieur à 15 min est néanmoins désiré pour limiter les coûts du procédé. Par ailleurs, l’intérêt économique associé à l’augmentation de l’âge du CAP peut-être atténué par le besoin d’augmenter la concentration en CAP si l’adsorption est le mécanisme visé. De façon générale, ce projet démontre qu’une optimisation à l’échelle pilote du procédé est nécessaire car les objectifs de traitement, la qualité de l’eau à traiter et le fait que les 3 paramètres d’opération soient inter-reliés complexifient l’optimisation du PMH. Étant donné l’impact du TRH sur le coût du PMH, de futures recherches devraient viser à l’optimisation du mélange.
Hybrid membrane processes (HMPs) couple membrane filtration with powdered activated carbon (PAC). In HMPs, low-pressure membranes ensure an efficient particle removal, including protozoan parasites such as Cryptosporidium, while the PAC contactor is devoted to the removal of dissolved compounds. Such processes are emerging as a promising alternative to conventional treatment chains, which no longer allow the drinking water facilities to comply with increasingly stringent regulations on the treated water quality. To decrease the operating costs associated with virgin PAC consumption, it was suggested to let the PAC age in the PAC contactor of the process. Until now, the potential of using aged PAC in HMPs has been demonstrated for ammonia and DOC removal, but the potential to remove micropollutants remains unknown. It is suggested that the biological activity in aged PAC contactors contributes significantly to the removal of the dissolved compounds. Yet, neither the extent of the biomass on the aged PAC, nor the residual adsorption capacity, was quantified. No study focused on discriminating the mechanisms responsible for the treatment when using aged PAC suspensions. Most of the data published on HMPs using aged PAC were gathered at pilot scale under warm water conditions, yet the efficiency of the process is most likely sensitive to temperature changes. There is currently little information available on the efficiency of HMPs under cold water conditions. This lack of information hinders the optimization of the HMP, leading to sub-optimal usage of aged PAC.
The main objective of this research project is to describe the performance of the PAC contactor of HMPs in removing ammonia, dissolved organic carbon (DOC), biodegradable DOC (BDOC) and micropollutants. In particular, emphasis was placed on the operation of the HMP under high PAC residence times. On a more detailed level, the objectives of this project were (1) to develop and compare methods to quantify the biomass developed on aged PAC, (2) to develop a method to produce an abiotic control for aged PAC, (3) to characterize the removal kinetics of ammonia, DOC, BDOC and micropollutants occurring in the carbon contactor of an HMP, (4) to evaluate the impact of water temperature on the performance of the carbon contactor of an HMP, (5) to discriminate the relative importance of adsorption versus biological oxidation as mechanisms responsible for ammonia, DOC and micropollutants removal in the PAC contactor of an HMP, and finally (6) to differentiate the relative importance of the hydraulic retention time (HRT), the PAC age and the PAC concentration as key operating parameters on the optimization of the performance of the PAC contactor of an HMP.
To set the basis on the study of aged PACs, the first part of this research project consisted in methodological developments i) to quantify the heterotrophic and nitrifying biomass colonizing aged PAC, and ii) to create a reliable abiotic control of the colonized PAC, which is required for discriminating the mechanisms occurring on aged PAC. Heterotrophic and nitrifying biomass quantifying methods developed for colonized granular activated carbon (GAC) were successfully adapted to the aged PAC. The preferred methods were the potential 14C-glucose respiration (PGR) rate and the potential nitrifying activity (PNA), as they quantify the active heterotrophic and nitrifying biomass, which is most likely responsible for the depletion of BDOC and ammonia. An alternative method to the PGR, the potential acetate uptake (PAU) rate, was developed to alleviate the logistical and budgetary issues associated with the utilization of radio-labeled glucose. The densities (per gram of dry PAC) of both active heterotrophic and nitrifying biomasses were found comparable to that of the GAC sampled from the surface of a biological GAC filter. The gamma-irradiation was demonstrated as a reliable method to produce abiotic samples from soils, and was therefore chosen to produce abiotic colonized PAC samples in this project. In order to determine the optimized dosage of gamma-rays, increased doses were applied on PAC samples. Heterotrophic plate counts and methylene blue adsorption kinetics were used to determine respectively the lowest gamma ray dose required to inhibit the bacterial activity, and the highest dose that could be applied without affecting the aged PAC adsorption capacity and kinetics. Refractory DOC (RDOC) adsorption kinetics confirmed the accuracy of the dose chosen as the adsorptive behavior of the aged PAC was not affected. PGR rates were decreased 83% at the optimized dose. The gamma-irradiation method was therefore proven efficient and used in the following work phases of this research.
The second part of this study focused on the removal of ammonia, DOC and a mixture of micropollutants. Firstly, the PAC contactor of an HMP was simulated at lab-scale to monitor ammonia removal kinetics. Three PAC concentrations (approximately 1-5-10 g/L) of three PAC ages (0-10-60 days) were tested at two temperatures (7-22°C), in settled water with ambient influent condition (100 µg N–NH4/L) as well as under a simulated peak pollution scenario (1000 µg N–NH4/L). The kinetics evidenced that ammonia flux at pilot scale limited biomass growth (HRT = 67 min). In contrast, PAC colonization was not limited by the available surface and thus, PAC concentration was not a key operating parameter under the colonizing conditions tested (5-10 g/L). Ammonia adsorption was significant onto virgin PAC but the ammonia nitrification was crucial to reach complete ammonia removal at 22°C. When using colonized PAC, the 60-d PAC offered a better resilience to temperature decreases (78% at 7°C) as well as lower operating costs than the 10-d PAC (<10% at 7°C). Significant ammonia adsorption was also evidenced on 60-d PAC suspension, most probably due to PAC and the presence of suspended solids, but not on 10-d PAC. Adsorption and nitrifying activity were superior on 60-d PAC than on 10-d PAC at 7°C. In case of peak pollution, the process was most probably phosphate-limited but a mixed adsorption/nitrification still allowed 50% ammonia removal on 10-d and 60-d PAC at 22°C. A kinetics based model was developed to predict ammonia removals and to determine the relative importance of the adsorption and nitrification on colonized PAC under the conditions tested.
DOC, BDOC and RDOC removals occurring in the PAC contactor of an HMP were also simulated at lab-scale. Similar conditions to that of the ammonia removal kinetics were tested. The initial ammonia concentration remained untouched in the water matrices (settled water and raw water) but the BDOC-to-DOC ratio was altered by pre-ozonation (0 to 1.5 g O3/g C). The 10-d and 60-d abiotic controls were used to discriminate DOC adsorption from biodegradation. DOC biodegradation contributed marginally to DOC removal in the investigated conditions and DOC adsorption was increased at higher temperature. An original model integrating the PAC age distribution was developed to predict DOC removal in aged PAC contactors operated at steady-state. At a mean PAC residence time of 60-d, the younger PAC fraction (25-d and less) was primarily responsible for DOC adsorption (> 80%). This fraction represents 34% of the mass of PAC in the contactor. When using a water matrix with a higher initial DOC concentration (raw water) or a lower affinity for PAC (pre-ozonated settled water), the residual adsorption capacity of that older fraction was proven useful.
Lastly, a mixture of micropollutants (atrazine, deethylatrazine (DEA), linuron, microcystin, caffeine, carbamazepine, sulfamethoxazole, diclofenac, progesterone and medroxyprogesterone) was spiked at environmentally relevant concentrations (from 130 ng/L to 33 µg/L) in settled water (0 and 0.85 gO3/gC). The micropollutants concentration depletion was monitored over a period of 7h to 48 h on 1 g/L of 0-d, 10-d, 60-d PAC and gamma-irradiated 60-d PAC. Even in presence of NOM, the spiked micropollutants were rapidly adsorbed on aged PAC. No biodegradation was observed. Removals superior to 95% were reached within 5 minutes, and direct competition with NOM did not impact the efficiency of the process when micropollutants were spiked at environmentally relevant concentrations. Therefore, HMPs operated to remove DOC and ammonia can control transient micropollutant pollution and comply with the World health Organization recommendations for atrazine (2 µg/L) and microcystin (1 µg/L). However, the stricter European regulations for atrazine and DEA (0.1 µg/L) could not be met with 10-d and 60-d PAC under the operating conditions tested. Reaching such strict treatment objective would require a specific optimization of the process.
In general, this PhD research evidenced the role of the residual adsorption of aged PAC suspensions for the treatment of dissolved compounds. From the results obtained in this project, the potential of HMPs using aged PAC to remove micropollutants was evidenced. Additional research is however required to validate this potential under varied operating conditions. The modeling work improved the understanding of aged PACs. Finally, this research work provides original information on the optimization of HMPs. The optimization of the operating parameters will vary with the water quality targeted and the quality of the influent water. The PAC concentration, PAC age and HRT are inter-related. Therefore, it is recommended to optimize the operation of HMPs at pilot scale. Seasonal variations should be accounted for. An HRT of at least 15 min is required when the biological activity is mandatory to reach the water quality objectives. Lower HRT might be applied if adsorption is favored. Finally, as the HRT has a strong impact on the total cost of the process (capital and operational expenditure), PAC contactors’ hydraulic should be the point of focus of future research.&
Doctorat en Sciences agronomiques et ingénierie biologique
info:eu-repo/semantics/nonPublished
Bombard, Antonio Jose Faria. "Suspensões magneto-reologicas de pos de ferro carbonilo : um estudo da influencia das propriedades magneticas e do tamanho das paritculas". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249119.
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
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Doutorado
Físico-Química
Doutor em Ciências
RIBEIRO, CHRISTIANE. "Obtenção e caracterização de biocerâmicas porosas à base de fosfatos de cálcio processadas com a utilização de albumina". reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11660.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP
Andersson, Karin M. "Aqueous Processing of WC-Co Powders". Doctoral thesis, KTH, Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3725.
The object of this work is to obtain a fundamentalunderstanding of the principal issues concerning the handlingof an aqueous WC-Co powder suspension.
The WO3 surface layer on the oxidised tungsten carbidepowder dissolves at pH>3 with the tungsten concentrationincreasing linearly with time. Adding cobalt powder to thetungsten carbide suspension resulted in a significant reductionof the dissolution rate at pH<10. Electrokinetic studiesindicated that the reduced dissolution rate may be related tothe formation of surface complexes; the experiments showed thatCo species in solution adsorb on the oxidised tungsten carbidepowder.
The surface forces of oxidised tungsten and cobalt surfaceswere investigated using the atomic force microscope (AFM)colloidal probe technique. The interactions at various ionicstrengths and pH values are well described by DLVO theory. Theadsorption of cobalt ions to tungsten oxide surfaces resultedin an additional non-DLVO force and a reduced absolute value ofthe surface potential. It was shown that the adsorption ofpoly(ethylene imine) (PEI) to the WO3 surfaces induces anelectrosteric repulsion.
The properties of spray-dried WC-Co granules were related tothe WC primary particle size, and the poly(ethylene glycol)(PEG) binder and PEI dispersant content in aqueous WC-Cosuspensions. The granule characterisation includes a new methodfor measuring the density of single granules. The increase inthe fracture strength of granules produced from suspensionsthat were stabilised with PEI was related to a more densepacking of the WC-Co particles.
The AFM was used to study the friction and adhesion ofsingle spray-dried WC-Co granules containing various amounts ofPEG binder. The adhesion and friction force between two singlegranules (intergranular friction) and between a granule and ahard metal substrate (die-wall friction) have been determinedas a function of relative humidity. The granule-wall frictionincreases with binder content and relative humidity, whereasthe granule-granule friction is essentially independent of therelative humidity and substantially lower than the granule-wallfriction at all PEG contents.
Key words:Hard Metal, Cemented Carbide, WC-Co, TungstenCarbide, Cobalt, Oxidation, Dissolution, Surface Complexation,XPS, AFM, Colloidal Probe, Hamaker Constant, Cauchy, WO3,CoOOH, ESCA, Zeta-Potential, Surface Potential, Poly(ethyleneimine), PEI, Suspension, van der Waals, Steric, Spray-Dried,Poly(ethylene glycol), Strength, Density, Friction, Adhesion,Granule, PEG, Pressing, FFM.
Гармаш, Д. А. "Проект легкового автомобіля ЗАЗ 1103 з модернізацією передньої підвіски". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23183.
Проведено аналітичний огляд легкових автомобілів певного класу й модельного ряду автомобілів. Проведено визначення масових показників та параметрів автомобіля та його двигуна. Проведено розрахунок зовнішньої швидкісної характеристики двигуна, силового балансу автомобіля та визначення параметрів трансмісії. Проведено розрахунок показників динамічності автомобіля при рівномірному та не рівномірному русі, метод силового балансу та динамічної характеристики. Проведено розрахунок паливної економічності автомобіля.
An analytical inspection of cars of a certain class and model range of cars was carried out. The determination of mass indicators and parameters of the car and its engine is carried out. The calculation of the external speed characteristics of the engine, the power balance of the car and the definition of transmission parameters. The calculation of the dynamics of the car with uniform and non-uniform motion, the method of force balance and dynamic characteristics. The calculation of fuel efficiency of the car is carried out. The types of car suspensions were considered, the calculation and modernization of the ZAZ 1103 car suspension were performed. During the bachelor's qualification work, calculations and drawings were performed in such programs as "Compass" and "Mathcad".
Peters, Simone [Verfasser] [Gutachter], Horst-Michael [Akademischer Betreuer] Ludwig, H. F. Reinhard [Gutachter] Trettin e H. J. H. (Jos) [Gutachter] Brouwers. "The Influence of Power Ultrasound on Setting and Strength Development of Cement Suspensions / Simone Peters ; Gutachter: H. F. Reinhard Trettin, H. J. H. (Jos) Brouwers, Simone Peters ; Betreuer: Horst-Michael Ludwig". Weimar : F. A. Finger-Institut für Baustoffkunde, 2017. http://d-nb.info/1125372516/34.
Peters, Simone [Verfasser], Horst-Michael [Akademischer Betreuer] Ludwig, Reinhard [Gutachter] Trettin e H. J. H. (Jos) [Gutachter] Brouwers. "The Influence of Power Ultrasound on Setting and Strength Development of Cement Suspensions / Simone Peters ; Gutachter: H. F. Reinhard Trettin, H. J. H. (Jos) Brouwers, Simone Peters ; Betreuer: Horst-Michael Ludwig". Weimar : F. A. Finger-Institut für Baustoffkunde, 2017. http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170210-27446.
Peters, Simone [Verfasser], Horst-Michael [Akademischer Betreuer] Ludwig, H. F. Reinhard [Gutachter] Trettin e H. J. H. (Jos) [Gutachter] Brouwers. "The Influence of Power Ultrasound on Setting and Strength Development of Cement Suspensions / Simone Peters ; Gutachter: H. F. Reinhard Trettin, H. J. H. (Jos) Brouwers, Simone Peters ; Betreuer: Horst-Michael Ludwig". Weimar : F. A. Finger-Institut für Baustoffkunde, 2017. http://d-nb.info/1125372516/34.
Нехай, Я. В. "Проект легкового автомобіля з розрахунком підвіски". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23187.
Проведено аналітичний огляд легкових автомобілів схожих за парамерами та компонувальною схемою. Проведено визначення масових показників та параметрів автомобіля та двигуна. Проведено розрахунок зовнішньої швидкісної характеристики двигуна, силового балансу автомобіля та визначення параметрів трансмісії. Проведено розрахунок тягово-динамічних характеристик. Проведено розрахунок гальмівних властивостей і паливної економічності автомобіля. Розглянули види підвісок автомобілів, проаналізували підвіску автомобіля Ford F-150, виконали розрахунок підвіски. При виконанні кваліфікаційної роботи бакалавра, розрахунки та креслення виконували в таких програмах, як: “Компас 3D” та “Mathcad”.
An analytical review of cars similar in parameters and layout was conducted. The mass indicators and parameters of the car and the engine were determined. The calculation of the external speed characteristics of the engine, the power balance of the car and the definition of transmission parameters. The calculation of traction-dynamic characteristics is carried out. The calculation of braking properties and fuel efficiency of the car is carried out. Considered the types of car suspensions, analyzed the suspension of the car Ford F-150, performed the calculation of the suspension. When performing the bachelor's qualification work, calculations and drawings were performed in such programs as: "Compass 3D" and "Mathcad".
N'Cho, Janvier Sylvestre. "Développement de nouvelles méthodes de diagnostic et de régénération des huiles pour transformateurs de puissance". Thesis, Ecully, Ecole centrale de Lyon, 2011. http://www.theses.fr/2011ECDL0004/document.
A power transformer outage has a dramatic financial consequence not only for electric power systems utilities but also for interconnected customers. In order to prevent any failure and to optimize their maintenance, various diagnostic techniques and tools have been developed. Insulating oil contains about 70% of diagnostic information on the transformer condition. The challenge is to access and use them efficiently. To meet this objective reliable diagnostic techniques are required. In addition to traditional testing methods, three recently developed ASTM testing techniques were used: (1) oil stability testing that simulates the behaviour of oil under electrical stress by providing information on its quality; (2) the UV/Visspectrophotometry that measures the amount of the relative dissolved decay products in insulating oil; and (3) the turbidity that measures the purity of virgin and aged oil. A quantitative laboratory technique capable of determining the parameters affecting the formation of corrosive sulphur deposition on copper conductors in power transformer is proposed. It is shown among other that the gassing tendency of natural esters is lower than that of the other types of insulating fluids (mineral oil, synthetics esters and silicone oil). The turbidity and UV/Vis spectrophotometry allow quantifying effectively, the relative amount of contaminants resulting from electrical discharge in oils. A large number of reclamation cycles (around 15 passes) are required for in-service aged oil to regenerate to the level of new oil. Anew technique enabling reducing the number of reclamation cycles is proposed; this latter consists in the use of Fuller’s Earth previously treated with dry nitrogen. It is also shown that time is the most influential parameter in the formation of corrosive sulfur. The process is accelerated when time and aggressiveness of oxygen are partnered
Boes, Christoph. "Active automatic chassis actuation for an excavator". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71224.
Вергелюк, О. О. "Проєкт легкового автомобіля Opel Campo з розрахунком підвіски". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23199.
Проведено аналітичний огляд трьох легкових автомобілів схожих за параметрами та компонувальною схемою. Проведено визначення масових показників та параметрів автомобіля та двигуна. Проведено розрахунок зовнішньої швидкісної характеристики двигуна, силового балансу автомобіля та визначення параметрів трансмісії. Проведено розрахунок тягово-динамічних характеристик. Проведено розрахунок гальмівних властивостей і паливної економічності автомобіля. Розглянули види підвісок автомобілів, проаналізували підвіску автомобіля Opel Campo, виконали розрахунок підвіски. При виконанні кваліфікаційної роботи бакалавра, розрахунки та креслення виконували в таких програмах, як: “Компас 3D” та “Mathcad”.
An analytical inspection of three cars with similar parameters and layout was carried out. The mass indicators and parameters of the car and the engine were determined. The calculation of the external speed characteristics of the engine, the power balance of the car and the definition of transmission parameters. The calculation of traction-dynamic characteristics is carried out. The braking properties and fuel efficiency of the car are calculated. Considered the types of car suspensions, analyzed the suspension of the car Opel Campo, performed the calculation of the suspension. During the qualification work of the bachelor, calculations and drawings were performed in such programs as: "Compass 3D" and "Mathcad".
Magnant, Jérôme. "Composites fibreux denses à matrice céramique autocicatrisante élaborés par des procédés hybrides". Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14105/document.
The fabrication of multidirectional continuous carbon fibers reinforced dense self healing Ceramic Matrix Composites by new short time hybrid processes was studied. The processes developed are based, first, on the deposition of fiber interphase and coating by chemical vapor infiltration, next, on the introduction of ceramic powders into the fibrous preform by Slurry Impregnation and, finally, on the densification of the composite by liquid-phase Spark Plasma Sintering (SPS) or by Reactive Melt Infiltration of silicon (RMI).The homogeneous introduction of the ceramic particles into the multidirectional fiber preforms was realized by slurry impregnation from highly concentrated (> 32 %vol.) and well dispersed aqueous colloid suspensions. The densification of the composites by spark plasma sintering was possible with a short (< 5 minutes) dwelling period in temperature. The chemical degradation of the carbon fibers during the fabrication was prevented by adapting the sintering pressure cycle to inhibit gas evolution inside the system. The composites elaborated are dense. The fully densification of the composites by RMI was realised by carefully controlling the impregnation parameters to avoid to entrap some gaseous species inside the fiber preforms. Our carbon fiber reinforced ceramic matrix composites processed by Spark Plasma Sintering or Reactive Melt Infiltration have a damageable mechanical behaviour with a room temperature bending stress at failure around 300 MPa and have shown their ability to self-healing in oxidizing conditions. Compared to the CMC processed by CVI, the composites processed with a final consolidation step by RMI are fully dense and have a similar room temperature tensile test behaviour with an ultimate tensile stress around 220 MPa
Allafi, Mousa. "La cour pénale internationale et le conseil de sécurité : justice versus maintien de l'ordre". Thesis, Tours, 2013. http://www.theses.fr/2013TOUR1002/document.
The international criminal Court system (ICC) whose mission is to ensure international justice, is based on a close relationship with the security Council. So it is proper to wonder about the Council’s role in the functioning of international criminal justice. Such a questionning is fundamental, for the intervention of a political body into the functioning of a judicial body calls into question the missions of both institutions. The Council’s interference in the activity of the ICC, based on its mission of maintaining international peace, is actually carried out on behalf of an international order intended by the Council itself. This role affects the functioning, the independence and even the impartiality of the ICC. The powers the Rome Statute gives to the Council allow it to refer to the ICC, to impose for the States to cooperate with the Court, to suspend its activity or also to qualify an act as a crime of aggression. However the relations between the Council and the ICC should not be subordinated, but maintained in mutual respect. Thus there is a real concern regarding the observance of the Rome Statute by the Council. The study highlights the conflict between justice and politics and reveals the current issues in terms of international criminal justice
Дурас, А. Ю. "Дослідження процесу зносу деталей системи колінчастого вала та його впливу на ресурс та надійність автомобіля /комплексний проєкт/". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/23216.
Предметом магістерської роботи є розрахунок конструкції автомобіля. Об’єктом дослідження магістерської роботи є підвіска автомобіля, з подальшим процесом дослідження процесу зносу деталей системи колінчастого вала та його впливу на ресурс та надійність автомобіля Мета роботи – виконати розрахунок підвіски й рульового керування дослідити процес зносу деталей системи колінчастого вала та його впливу на ресурс та надійність автомобіля При виконанні магістерської роботи, визначили масові показники й параметри автомобіля, провели розрахунок двигуна автомобіля, розрахували показники динамічності автомобіля, його паливну економічність. У спеціальній частині магістерської роботи було проведено аналіз та розбір видів підвісок та розрахунок елементів підвісок та рульового керування автомобіля ВАЗ 2103. Виконано інформаційно патентний пошук по Для виконання розрахунків та графічної частини використовувались такі програми як: “Компас 3D” та “Mathcad”.
The subject of the master's thesis is the calculation of the car design. The object of study of the master's thesis is the suspension of the car, with the subsequent process of studying the process of wear of parts of the crankshaft system and its impact on the resource and reliability of the car The purpose of work - to carry out calculation of a suspension bracket and a steering to investigate process of wear of details of system of a cranked shaft and its influence on a resource and reliability of the car. When performing the master's thesis, determined the mass indicators and parameters of the car, calculated the car engine, calculated the dynamics of the car, its fuel economy. In the special part of the master's work the analysis and analysis of types of suspension brackets and calculation of elements of suspension brackets and steering of the car VAZ 2103 was carried out. An information patent search was performed on Such programs as “Compass 3D” and “Mathcad” were used to perform calculations and graphical part.