Дисертації з теми "Mott materials"
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Lantz, Gabriel. "Ultrafast electron dynamics in Mott materials." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112014/document.
Mott insulators are a perfect example of how local electronic correlations can change macroscopic properties of materials. Varying slightly the doping or the pressure can transform a metal to an insulator. These properties can be modified extremely rapidly by driving these materials far from equilibrium. We have investigated the model Mott-Hubbard material Cr-doped V2O3 using state of the art pump-probe techniques, namely angle resolved photoelectron spectroscopy, optical reflectivity, THz time-domain spectroscopy, and X-ray diffraction. We were able to unequivocally disentangle the electronic and the lattice response of the system to a femtosecond laser excitation, which was kept in all cases at a wavelength of 800 nm. We present a comparative study of these transient responses, which demonstrates the strong electron-phonon coupling of this strongly correlated model material. We show that before thermalization, spectral weight is transferred from the lower Hubbard band towards the Mott gap. On a longer time scale a metastable state is stabilized by the lattice structure. To further understand the transient response of Mott insulators, we have also studied another Mott compound, BaCo1-xNixS2. The general trends of photoexcitation in Mott insulators are analyzed using a two orbital model. We argue that the filling of the gap can be due to a change of the specific orbital fillings
Scheiderer, Philipp [Verfasser], and Ralph [Gutachter] Claessen. "Spectroscopy of Prototypical Thin Film Mott Materials / Philipp Scheiderer ; Gutachter: Ralph Claessen." Würzburg : Universität Würzburg, 2019. http://d-nb.info/1193423899/34.
Winograd, Emilio. "Orbital-selectivity in strongly correlated fermionic systems. From materials to cold-atoms." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112031.
This thesis focuses on multiorbital aspects of strongly correlated fermionic systems. In particular, it focuses on the existence of orbital differentiation in which coexistence of itinerant and localized character can be associated to different orbitals. This subject is discussed in the context of cold atoms and materials, providing a bridge between both communities.In the first part of the thesis, we give an insight into the problem of strong correlations in materials, and we introduce the concept of 'orbital-selective Mott transition'. We also provide the main tools to understand how materials can be simulated with cold atoms experiments, and we present important related results in the context of the metal-Mott insulator transition. The technical aspects, based on dynamical mean-field theory are also discussed, and the solution of two key models of strongly correlated fermionic systems, i.e., the Hubbard model (HM) and the Falicov-Kimball model (FKM), are reviewed.Then we study in detail the physics of two interacting fermionic species with different masses in an optical lattice. We establish the different phases (with and without long-range order) in terms of the interactions strength (U), mass ratio and temperature (T), and also discuss the thermodynamic variables, which are relevant in cold atoms experiments. We show that in the metallic phase (U below a critical value) and for some degree of mass imbalance, a crossover appears between a Fermi-liquid metallic state at low T, and an 'orbital-selective' state at higher T, where the heavy fermions effectively localize while the light species remain itinerant. Hence, we propose this minimal model for addressing orbital-selective physics with cold atoms experiments.Based on the properties of the studied model, we propose the 'entropic chromatography' as a new method for cooling fermionic atoms in optical lattices. We discuss its efficiency and limitations, and provide some ideas in order to overcome them.In the last part of the thesis we generalize the previous model to a model relevant for multiband correlated materials that can display orbital differentiation. We show that the orbital-selective Mott state can be stable under lattice distortions modeled by local hybridization between the orbitals. However, the Mott state is characterized by a pseudogap, where charge fluctuations abruptly reduce, but the state remains compressible. In connection with the previous model, we discuss the temperature-induced orbital-selective crossover in this problem, we compare our results with photoemission experiments, and predict what would happen in materials that display local hybridization between the bands
Sagaidak, Iryna. "Bi-functional materials combining energy storage and energy conversion from sunlight." Thesis, Amiens, 2019. http://www.theses.fr/2019AMIE0025.
The problem of intermittent nature of solar energy is often addressed by the traditional coupling of the PV and battery units. Our more fundamental approach targets the development of materials able to combine solar energy conversion and storage at the molecular level. The 5 nm anatase TiO2 nanocrystals were synthesized in our group affording a quantitative photorecharge reaction by a sole contribution of illumination. Here, we present a study of the evolution of the optoelectronic properties and dynamics of charge transfer in TiO2 electrode using in situ / in operando experiments performed during the battery functioning (UV-visible, Mott-Schottky, fluorescence spectroscopy). The increase of the bandgap value and the rise of absorbance are observed upon lithium insertion into TiO2. A negative shift of the conduction band indicates a more oxidizing potential of the photogenerated holes in Li0.6TiO2 compared to TiO2. By analysis of the recombination processes in TiO2 upon lithium insertion, we established a competition of the ultra-fast (ps range) processes of direct recombination and charge transfer towards Ti3+ in Li0.6TiO2, potentially limiting the yield of the photorecharge reaction. This study was extended to other insertion materials typically used in lithium-ion batteries (Li4Ti5O12, LiCoO2, LiFePO4, MoO3, etc.). The measured band edge positions, band gap, charge carrier type and concentration were gathered into a database, based on which the fundamental evaluation of the possibility of the light-induced photorecharge was conducted. The first results of the photoelectrochemical study of chosen materials are also discussed
Leriche, Raphaël. "Unconventional superconductivity in quasi-2D materials with strong spin-orbit coupling." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS577.
The realization of topological superconductors is one of the main current goals of condensed matter physics. It was indeed predicted that such systems should host Majorana fermions. These Majorana fermions possess both a non-Abelian statistics and, because of their topological origin, a certain robustness against local disorder, which makes them attractive for quantum computing applications. One approach likely to lead to topological superconductivity consists in considering superconducting systems with strong spin-orbit coupling and with broken inversion symmetry. It is in this framework that, during this thesis, I performed scanning tunneling microscopy and spectroscopy measurements on quasi-2D materials : (LaSe)1,14(NbSe2)2 and Sr2IrO4. I first studied the electronic properties of misfit compound LaNb2Se5, which is a parent of transition metal dichalcogenide 2H-NbSe2. (LaSe)1,14(NbSe2)2 is a heterostructure made out of alternations of NbSe2 bilayers with trigonal prismatic geometry and LaSe bilayers with rocksalt structure. (LaSe)1,14(NbSe2)2 is a potential candidate for topological superconductivity because of the presence of both a strong spin-orbit coupling and of broken inversion symmetry in NbSe2 planes. Here, I present spectroscopic results showing that the electronic structure of(LaSe)1,14(NbSe2)2 is very similar to the one of electron-doped monolayer NbSe2 with a shift of the chemical potential of 0,3 eV, priorly never reached. I could also demonstrate the quasi- 2D nature of (LaSe)1,14(NbSe2)2 and more particularly the presence of a strong Ising spinorbit coupling. Moreover, the observed weakness of superconductivity against non-magnetic disorder combined with quasiparticle interferences measurements allowed me to exhibit the unconventional nature of (LaSe)1,14(NbSe2)2 superconducting order parameter. This study opens the possibility to use misfit heterostructures such as (LaSe)1,14(NbSe2)2 to study thephysics of transition metal dichalcogenides in the 2D limit, for which many theoretical studies predict topological superconductivity. In this thesis, I also present a study on the effects of doping on the electronic properties of iridate compound Sr2IrO4. Sr2IrO4 is a spin-orbit induced Mott insulator. Because inversion symmetry is locally broken in Sr2IrO4, some theoretical predictions suggest that Sr2IrO4 should turn into a topological superconductor once doped. Here, I exhibit a nanometer-scaleinhomogeneous doping-driven Mott insulator to pseudo-metallic phase transition. This work further justifies the importance of using a local probe such as scanning tunnelling microscopy in order to complete results on Mott physics obtained by integrative methods like angle-resolved photoemission spectroscopy
Koussir, Houda. "Multiscale study of the electric field induced transition in the Mott phase of GaMo4S8 crystals and TaSe2 monolayers." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILN004.
In the realm of condensed matter physics, Mott insulators are essential for exploring complex electronic phenomena, with significant implications for high-temperature superconductivity and quantum spin liquids. This thesis investigates two types of such materials, distinguished by their dimensionality : GaMo4S8 crystals and monolayer 1T-TaSe2.After presenting their properties in the first chapter, the second chapter addresses the local-scale characterization techniques used to characterize both materials, namely scanning tunneling microscopy and spectroscopy for structural and electronic studies, and multi-tip scanning tunneling microscopy for transport measurements. The latter technique was particularly employed to analyze transport in GaMo4S8. The study then delved into the material response to external electric fields, examining the threshold electric field in relation to the electrode geometry and exploring the temporal evolution of switching times in connection with inter-electrode distances. The achievement of volatile transitions opens prospects for applications such as the operation of a microneuron at room temperature.To enhance the control over phase transition properties of Mott insulators, it is beneficial to consider two-dimensional systems where the current flow is restricted within the crystal plane. The final chapter focuses on the 1T phase of TaSe2, epitaxially grown on gallium phosphide (GaP) semiconductor substrates. Low-temperature scanning tunneling microscopy studies reveal that 1T-TaSe2 monolayers exhibit not only the characteristic charge density modulation (Star of David) of the charge density wave phase but also a unique Moiré pattern due to the monolayer interaction with the GaP substrate. Scanning tunneling spectroscopy has identified a bandgap, hallmark of the Mott insulating state. This state is further substantiated by temperature-dependent transport measurements that show the persistence of the insulating phase up to 400 kelvins. Notably, spectroscopic measurements with varying tip-to-surface distances have unveiled insulator to metal transitions at low temperatures. The observation of such transitions suggests that this large-scale heterostructure could be a material of choice for neuromorphic applications
Forino, Paola Caterina. "Nuclear magnetic resonance study of the electron doped Dirac-Mott Insulator double perovskite Ba2Na(1-x)CaxOsO6." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Boissy, Clément. "Transport de matière au sein du film passif : Développement d’une méthodologie sélective corrélant les Point Defect Model et les modèles descriptifs." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0136.
Developments in metallic bipolar plate, to apply more widely fuel cells, require an improved of the constitutive material. The use of stainless steel calls for a good understanding of the passive film. The required specifications are for good electrical conductivity and a long life-time. Those two parameters correspond to a correlation between the semiconductive properties and the good corrosion behavior. Nevertheless, the main problems of the passivity lie on the multiplicity of the phenomena that alter the passive film behavior. Numerous models described in the literature can be used to characterize the passivation. The Point Defect Model (PDM) describes the passivation through electrochemical reactions at the metal / oxide and at the oxide / electrolyte interfaces. The reactivity is limited by mass transport through the oxide. From the literature, those phenomena seems to be a discriminating parameter in the choice of a model. The selective method proposed allows us to use each model taking into account their specifics. This methodology is based on the correlation between the mass transport characterization, thanks to the PDM, and the analysis of the Electrochemical Impedance Spectroscopy (EIS). The PDM determines the transport coefficient apart from EIS measurements, so to validate the consideration of the mass transport during the analysis of the electrochemical impedance spectra. The evolution of the main charge carrier density as a function of the oxide formation potential allows us to calculate the transport coefficient from PDM equations. Thanks to the thickness of the oxide (determined by X-ray Photoelectron Spectroscopy), the time constant of the mass transport is determined. Based on this value, a descriptive model is used to analyze the EIS data, avoiding overparametrization. This method is applied first on a model material, pure chromium exposed to acidic solution (pH 2) at several temperatures (30°C and 80°C). It shows that the mass transport has to be taken into account at 80°C and the EIS model considers an inner chromium oxide layer and an outer chromium hydroxide. Secondly, the method is used to characterize an industrial material, AISI 316L stainless steel, at several pH (1, 2 and 3) and at several temperatures (30°C and 80°C). In this case, the oxide is describe as a p-n semiconductor junction with an chromium rich inner layer and an outer iron rich layer. The present methodology permits to deeply characterize the AISI 316L stainless steel. Even if this study concerns the substrate, this step is decisive to improve the performances of the metallic bipolar plates
Kamal, Abdelhamied Saber Suzan. "Synthesis and characterization of some nano-selenides and their applications in solar cells." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/107389.
Abstract Increasing global energy consumption together with environmental concerns has led to much interest in alternative, cleaner sources of energy such as solar photovoltaic. Researchers in the solar cell community have been looking for ways to reduce costs while maintaining or increasing already high efficiencies. A fundamental understanding of the materials under consideration is essential to rapid development of new technologies. The I-III-VI2 thin films offer promising systems for achieving high efficiency solar cells at lower costs. In fact, by tailoring the chemistry of the compounds it is possible to change the bandgap of the material in order to collect sunlight more efficiently. First of all, this thesis focuses on absorber layer material preparation and characterization, especially nanocrystalline thin films and consideration of both structural and electrical characteristics of such main cell absorber layer.The thesis examines how different preparation techniques and material usage could affect the properties of the synthesized thin films (absorber layer). In this study CuInSe2 and CuInS2 thin films were deposited onto ITO glass substrate using the electrodeposition technique in aqueous solution. The electrodeposited films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). The annealing effects on the electrodeposited precursors were investigated. The chalcopyrite structure of CuInSe2/CuInS2 showed an enhancement of crystallinity after subsequent selenization/sulfurization treatment in Se/S atmosphere, respectively. XRD and SEM studies revealed a dramatic improvement of the crystalline quality of CIS films after annealing treatments. The optical properties of annealed CuInSe2-Se and CuInSe2-S thin films have been studied in order to determine the effect of annealing process in different selenium and sulfur atmosphere. In the second step we modified copper indium CuInxCryGa1-x-ySe2 where x=0.4, y= (0.0, 0.1, 0.2, 0.3)superstrate layer by spin coating process. CuInxCryGa1-x-ySe2 where x=0.4, y= (0.0, 0.1, 0.2, 0.3) nanoparticles have been synthesized firstly using a wet chemical hydrothermal method that is based on a non-vacuum thermal process without any additional selenization process. Introducing different metal sources in an autoclave with ethylenediamine as solvent, CIGS nanoparticles were obtained at different temperatures range 190-230°C. The X-ray diffraction (XRD) results confirmed the formation of a tetragonal CuInxCryGa1-x-ySe2 chalcopyrite structure. Finally, we turned again to the study of the annealing temperature effect onKesterite materials but this time in those of very low-cost materials and environmentally friendly Cu2ZnSnS4. We studied the growth of quaternary Cu2ZnSnS4 (CZTS) kesterite thin films by a single step electrochemical deposition followed by annealing at low temperature. The influence of different annealing atmospheres at constant annealing times (t = 45 min) and fixed preparation controlling parameters; i.e., starting materials (precursor metal salts) solution concentration, time of deposition and electrodeposition potential. Structural, compositional, morphological, and optical properties, as well as photoelectrochemical properties were studied.
Resum (Valencià) L'augment del consum d'energia global juntament amb les preocupacions ambientals ha generat molt d'interès per les fonts d'energia alternatives i netes, com ara l'energia solar fotovoltaica. Els investigadors de la comunitat fotovoltaica han estat buscant formes de reduir costos mentre mantenen o augmenten les eficiències. Una millor comprensió dels materials implicats és essencial per al ràpid desenvolupament de noves tecnologies. Les pel·lícules primes I-III-VI2 ofereixen sistemes prometedors per aconseguir cèl·lules solars d'alta eficiència a un cost menor. De fet, en adaptar la composició dels compostos, és possible canviar la banda prohibida del material per captar la llum solar de manera més eficient. Aquesta tesi se centra en la preparació i caracterització del material de la capa absorbent, especialment les pel·lícules primes nanocristal·lines i la consideració de les característiques estructurals i elèctriques d'aquesta capa principal absorbent de cèl·lules. La tesi examina com les diferents tècniques de preparació i ús del material podrien afectar les propietats del pel·lícules primes sintetitzades. Pel·lícules primes CuInSe2 i CuInS2 es van dipositar sobre substrats de vidre ITO usant la tècnica d'electrodeposició en solució aquosa. Les pel·lícules electrodepositadas es van caracteritzar per difracció de raigs X (XRD), microscòpia electrònica de rastreig (SEM) i anàlisi de raigs X d'energia dispersiva (EDS). Es van investigar els efectes de recuit sobre els precursors electrodepositados. L'estructura de calcopirita de CuInSe2/CuInS2 va mostrar una millora de la cristal·linitat després del tractament posterior de selenització/sulfurització en atmosfera de Se o S, respectivament. Els estudis de XRD i SEM van revelar una millora de la qualitat cristal·lina de les pel·lícules de CIS després dels tractaments tèrmics. Les propietats òptiques de les pel·lícules primes recuites CuInSe2-Es i CuInSe2-S s'han estudiat per determinar l'efecte del procés de recuit en diferents ambients de seleni i sofre. A més, modifiquem el CuInxCryGa1-x-ySe2 de coure indi, on x = 0.4, i = (0.0, 0.1, 0.2, 0.3) la capa d'superstrat pel procés de recobriment per centrifugat. CuInxCryGa1-x-ySe2 on x = 0.4, i = (0.0, 0.1, 0.2, 0.3) nanopartícules han estat sintetitzades en primer lloc fent servir un mètode hidrotermal químic humit que es basa en un procés tèrmic sense buit sense cap procés de selenización addicional. Introduint diferents fonts de metall en un autoclau amb etilenamina com solvent, es van obtenir nanopartícules de CIGS a diferents temperatures en un rang de 190- 230 °C. Els resultats de la difracció de raigs X (XRD) van confirmar la formació d'una estructura de calcopirita CuInxCryGa1-x-ySe2 tetragonal. Finalment, es va estudiar l'efecte de la temperatura de recuit en els materials tipus kesterita (com el Cu2ZnSnS4) que són materials de molt baix cost i que no danyen el medi ambient. Vam estudiar el creixement de les pel·lícules primes quaternàries Cu2ZnSnS4 (CZTS) de kesterita mitjançant un dipòsit electroquímic d'un sol pas seguit d'un recuit a baixa temperatura. La influència de diferents atmosferes de recuit a temps de recuit constants (t = 45 min) i paràmetres de control de preparació fixos; és a dir, concentració de la solució de materials de partida (sals de metalls precursors), temps de deposició i potencial d'electrodeposició. Es van estudiar les propietats estructurals, de composició, morfològiques i òptiques, així com les propietats fotoelectroquímiques
Kamal Abdelhamied Saber, S. (2018). Synthesis and characterization of some nano-selenides and their applications in solar cells [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/107389
TESIS
Yong, Chaw Keong. "Ultrafast carrier dynamics in organic-inorganic semiconductor nanostructures." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:b2efdc6a-1531-4d3f-8af1-e3094747434c.
Blom, Ulrika. "Hållbara material : fossilbaserade material byts mot hållbar (biobaserad) textil." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-22059.
Textiles and apparel manufacturing is a heavily polluting industry. To change that and get the textile industry in the direction of sustainable development, following must be done. Emissions of CO2 need to be considerably reduced, water consumption must drastically decline and the risk of spreading microplastics in nature have to be minimized. The three most common textile fibres on the market, polyester, cotton and polyamide, causing large emissions of CO2 and consumes huge amounts of water. This report seeks to find the textile materials that can meet the requirements of sustainability and eco-friendly materials of equivalent strength as in the three largest fibers like above. With the help of a literature review, a classification tool and a number of tests on physical samples have the materials above along with lyocell and PLA been examined and studied. The ecological sustainability and physical durability has been compared and measured. The results of the studies provides no clear-cut answers to the questions. The PLA seems promising, but are surrounded by uncertainty. In the meantime, the study has been going on, there are no signs of weakening of PLA-fabric, but will it keep for one hundred washes? Lyocell is environmentally sustainable and durable in the theory, but got an early break in the abrasion test. The lyocell fabric were made of thin yarn of staple fibers. Would it have been stronger if it had been made of filament yarn? Recycled polyester versus virgin polyester gives no great environmental benefits. However, recycled polyamide and organic cotton get large environmental gains. Lyocell, PLA, organic cotton and recycled polyamide could be environmentally and physically durable materials.
Antunes, Sofia Alexandra Duarte. "Mota-Engil divestment opportunity report." Master's thesis, NSBE - UNL, 2010. http://hdl.handle.net/10362/10340.
This report points out a brief description of a well-known group, whose activities are spread in 19 countries, from an internal as well as external view. Its main business areas are Engineering & Construction, Environment & Services as well as Transport Concessions. Furthermore, the market was also relevant to be analyzed to contextualize the company in its proper markets and industries with its competitors in order to find opportunities of development or divestments to be made for the improvement of the company, to create value for its shareholders, adding value for the company as a whole.
Bergstrand, Therese. "Materialets betydelse i arbetet mot en jämställd förskola : Hur material används och hur könade genusroller görs i barns lekar." Thesis, Karlstads universitet, Institutionen för pedagogiska studier (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-71156.
Johansson, Rasmus. "Arbetsförmedlingens användaranpassning : En studie kring materialet riktat mot ungdomar." Thesis, Linköping University, Department of Social and Welfare Studies, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57369.
Att anpassa sitt material efter olika målgruppers tilltänkta behov och förförståelse syftar till att bättre nå ut med information till gruppen ifråga. Detta riskerar dock att alienera de inom målgruppen som identifierar sig med den bild av målgruppen som anpassningen riktar sig mot. Anpassningen kan också resultera i att informationen blir bristande.
Fjellström, Daniel. "Mot en museologisk värdeteori : Varför vi ger och varför vi samlar." Thesis, Uppsala universitet, Institutionen för ABM, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-152633.
Schade, Melody Marchman. "Paratextual frames| A material study of Ottaviano Petrucci's four-voice Venetian motet prints, 1502-1505." Thesis, State University of New York at Buffalo, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3629842.
This dissertation constitutes a material study of the four-voice motet prints published in Venice by Ottaviano Petrucci between 1502 and 1505. These prints, Motetti A, Motetti de passione de cruce de sacramento de beata virgine et huiusmodi, Motetti C and Motetti Libro Quarto, coincided with a burgeoning silent reading culture that was interested in and attuned to devotional reading—particularly as it was made available through books of hours (horae)—and thus, represented a new opportunity for early sixteenth-century singers, readers, and collectors. This dissertation considers how the relationship between motet print, reader and horae might have encouraged a devotional attitude from readers and singers of these volumes.
Chapter 1 considers horae, late medieval reading practice, and the intertwined relationship between reading and prayer. Many of the material aspects of the prints—especially size and mise-en-page ("page layout")—are similar to those of contemporaneous books of hours (horae) and their likeness might have encouraged a reading posture that resonated with devotional reading. Additionally, pictorial evidence is presented that suggests that by the mid-sixteenth century at least one family may have considered printed music in this manner.
Chapter 2 takes the page as a formal starting point and, building upon the work of Gérard Genette and Bonnie Mak, extends the discussion of materiality to considerations of paratexts. Here, a nuanced reading of the mise-en-page, which considers the page layout, typeface, musical font, and table of contents (tavolae), reveals a web of intellectual and devotional associations available to a contemporary reader of Petrucci's four-voice Venetian motet prints.
Chapter 3 explores the relationship between the page and the music-making that the page enabled and considers these through a study of a uniquely musical paratext—the fermata. Analytic apparatus advanced by both Robert Hatten and Bonnie Blackburn reveals that the concept of markedness as it relates to the visual, oral, and aural aspects of the page allows for all the elements of the page to coalesce in a manner uniquely familiar and meaningful to the devotionally attuned reader/singer of Petrucci's prints.
In analyzing the material and paratextual features of Petrucci's motet prints, this dissertation engages with an array of theoretical, analytical, and historical frameworks. It simultaneously positions Petrucci's prints within a multivalent world of reading, printing, publishing, and singing and ultimately situates the prints within the realm of devotional activities.
Saverstam, Maria, and Daniel Jonsson. "Laborativ matematikundervisning : Ett steg mot ett mer lustfyllt lärande." Thesis, Umeå University, Mathematics and Mathematical Statistics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-809.
Syftet med detta examensarbete är att undersöka det laborativa arbetssättet i skolan utifrån ett lärarperspektiv. När och hur kan man använda laborativa material för att förbättra matematikundervisningen? Vi har försökt att besvara dessa frågor med hjälp av lärarintervjuer. Resultatet visar att lärarna i studien anser att fördelar med laborativ undervisning framförallt innebär att det blir konkret för eleverna och det öppnar möjligheter att koppla den abstrakta matematiken i läromedlet till elevernas förkunskaper i matematik. De menar vidare att laborationer är lustfyllt och att detta i sin tur kan leda till att eleverna blir mer motiverade till matematik. Nackdelar med arbetssättet verkar i första hand handla om ramfaktorer. Ett laborativt arbetssätt kräver resurser i form av tid, utrymme, material och personal, vilket kan vara svårt att frambringa på vissa skolor. Lärarna i vår undersökning verkar trots detta väldigt positivt inställda till att använda ett laborativt arbetssätt som ett komplement till den traditionella undervisningen utifrån läromedel.
Arata, Laura Joanne. "Embers of the social city business, consumption, and material culture in Virginia City, Montana, 1863 - 1945 /." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Spring2009/l_arata_052909.pdf.
Minx, Sascha. "Optimering av monteringsavdelningen förfjädergunglekar : Med Lean mot kundorderstyrd montering." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25670.
Jansson, Jonathan. "Materialoptimering av Kranbom och Framtagning av Provstav : Ett undersökande arbete mot högcykelutmattning av kallformade ståldetaljer." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80049.
Even though fatigue in steel structures is a phenomenon that was discovered almost 190 years ago it is still far from fully explored. The fatigue properties of base materials and welded materials are currently relatively well known, but the fatigue properties of cold-formed steel profiles are still more or less unknown. With the investigation of fatigue properties of cold-formed steel profiles as the main purpose, this master thesis was divided into two parts. An overhead optimization of a crane with the main goal of reducing weight as much as possible with the help of upgrading materials to higher strength steels and using the materials in an optimal way with respect to fatigue. The second part of the master thesis is the development of a test specimen with the main goal of testing the fatigue properties of cold-formed steel profiles and to provide dimensioning values for the optimization of the crane. The development of test specimen resulted in three versions of specimens which in theory will provide fatigue properties in the longitudinal direction for cold-formed steel profiles. Since the test specimens could not be tested because of shortage of time, the optimization of the crane had to be based on theoretical values. The results of the optimization were that the weight could be lowered from 1027 kg to 435 kg without affecting any other consideration characteristics of the crane.
Diaz, Candido Jr. "Moth Catching Masters: Analysis Of The Structrual And Mechanical Properties Of The Silk Spun By The Derived Orb-Web Weaver Cyrtarachne akirai." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1524054250656993.
Almeida, Paulo Vitor Gomes. "Investigação dos saberes psicológicos presentes em material produzido entre 1870 e 1930, na Faculdade de Direito de São Paulo, e suas relações com o Direito Natural vigentes à época." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/59/59137/tde-23102013-135525/.
The links between Legal knowledge and Psychology are ancient, albeit it\'s structuration in scientific molds only having begun in the nineteenth century, in the junction of psychological knowledge and criminal Law doctrines. From this knot, interdisciplinary connections have developed in many branches, leaving a fertile research field. The current work intends to stretch out to the relations existent between psychological knowledge raised in material produced in Faculdade de Direito de São Paulo in the critical period of scientific psychology\'s birth in Brazil and it\'s relation with the concepts of natural Law of the period. The choice for natural law has to do with it being more prone to psychological analysis, being the interest of this study the philosohical and psychological basis of Law, not specific legislation. The time period in question matches the one of the First Republic of Brazil. In this moment there are significant alterations in the educational context, where several measures promote transition from classical teaching to a pragmatic-scientific matrix; and in the contexto of psychological knowledge, having in sight that phylosophical psychology is in a moment of transition from french sensualism, empirism and spiritualist eccleticism to a positivist tradition. In the legal context, 1891\'s Constitution is presented to the people after a brief period of military government, making it a period of political and legal instability. Three theses were found as objects of the research. Two of them from José de Alcântara de Machado D\'Oliveira, being those \"A embriaguez e a responsabilidade civil\" e \"Ensaio Médico-Legal sobre o hypnotismo\" and the other from Candido Motta, named\"Classificação dos criminosos\". The methods utilized in the analysis were Historiography of Scientific Psychology and concetual analysis of the documents through the method of Cultural History. Data shows that there is appropriation of the main concepts of the time\'s positivism philosophy, including spencerian/lombrosian eugenics in the case of Candido Motta, whose theses aims to be a consulting manual on criminal classification. Jose D\'Oliveira sheds new light on a recurring issue of the time period and na important issue still today - drunkness and civil resposibilty - and on hypnotism, with na equally positivist approach. The concepts of Natural Law are presented in a moment of transition between a majorly thomistic view, in wich Natural Law is in connection with the divine, to a anthropological-scientifical view, where Natural Law is derived from humans themselves, liviing in groups. It is possible to discuss, based on the data collected and analysed, that there is consonance between the notions of Natural Law and Psychological Knowledge used by the authors. The transition to positivistic models is predominant, aiming to incorporate natural science\'s discoveries. The models based on humanistic, religious and phylosophical conceptions, according to Comte, would be in a \'metaphysical\' stage of humanity, thus being necessary the adoption of theories that were congruent with Comte\'s third and last stage, the \'scientific\' one. Predominantly metaphysical views started to be structured as organicist in this moment, before a properly psychological framework in a further moment. Financial Support: FAPESP
Bacchi, Michael. "Dinamica ed equazioni del moto di stringhe classiche relativistiche." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18390/.
Rose-Steel, Tamsyn. "French Ars nova motets and their manuscripts : citational play and material context." Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3313.
Pech, David. "Etude du comportement anticorrosion de revetements amorphes base Si élaborés par dépot chimique en phase vapeur." Phd thesis, INSA de Lyon, 2006. http://tel.archives-ouvertes.fr/tel-00120312.
Le caractère protecteur de revêtements de type SiOx et SiOxNy a été analysé sur différents types de substrats. La tenue à la corrosion résulte de la faible porosité et de la nature très isolante de ces couches.
La protection fournie par des dépôts SiCx et SiCxNy utilisés comme couche d'accrochage au DLC (“Diamond Like Carbon”) a ensuite été étudiée. L'influence du taux d'incorporation d'azote de films SiCxNy a révélé une corrélation entre la structure chimique, déterminée par XPS, et le caractère semi-conducteur de la couche, établi par Mott-Schottky. La tenue à la corrosion a été directement associée à la densité de porteurs de charge.
L'étude a été complétée par une caractérisation électrochimique et une approche tribocorrosion du caractère protecteur fourni par des revêtements duplex SiCxNy / DLC.
Rispoli, Hugo. "L'antagonisme dialectique matérialisme / idéalisme : un holisme polymorphe." Thesis, Montpellier 3, 2015. http://www.theses.fr/2015MON30035.
A journey inside history, ideology and psychology with a key, the antagonism between materialism and idealism. A new point of view arise and create a new kind of analysis on our modern times. From Martin Luther to today, we explore differents systems : Nazism, Socialism and Capitalism. We will find, in each system and so in human mind, this heuristic antagonism
Körner, Maria. "Det sensomotoriska materialet; ett hjälpmedel i matematikundervisningen : En undersökning gjord på en svensk montessoriskola mot de yngre åren." Thesis, Linköpings universitet, Institutionen för beteendevetenskap och lärande, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-65902.
Nyberg, James Ronald. "Learning Resource Center Characteristics of the 25 Most Profitable U.S. Industrial Corporations: Implications for Business and Higher Education." Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc279038/.
Andersen, Camilla Eline. "Mot en mindre profesjonalitet : "Rase", tidlig barndom og Deleuzeoguattariske blivelser." Doctoral thesis, Stockholms universitet, Barn- och ungdomsvetenskapliga institutionen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-114124.
Junior, Oswaldo Gonçalves. "Iniciativa privada na educação pública: a Fiat e o Programa Moto Perpétuo." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/48/48134/tde-07112007-114334/.
The aim of this research is to confront theoretical studies about the problematic of social actions promoted by private companies with the results of a case study focusing the Moto Perpétuo Program sponsored by Fiat automobiles S.A. which, for five years (1997 a 2001), donated kits of educational materials to thousands of schools from different regions of Brazil. Despite the ample reach of the Program, in which its promoters based themselves to assert that it was the biggest partnership of a private institution with the Brazilian Federal Government Program of Education Acorda Brasil! Está na hora da escola (Wake up Brazil! It´s time of school) destined to encourage private institutions to act for the education there wasn t, up to now, any study that could demonstrate the practical effects of this action, whether it was for the educational improvement (declared purpose as the main motivation for its existence), or in the implications to reassess the extent of the public and private spheres, a question that heats many debates nowadays. In the face of these observations, it was opted to do a reading and research from different sources that deal, directly or not, with the business social responsibility. More than a fundamental step for an appropriated approach of the studied object, this stage permitted to subsidise broader inferences about this subject, which condenses conflicting interests, frequently expressed by speeches of promotion and criticism more accustomed to ideologies than mirrored in the concrete meaning of many of these social actions. In another part, the Moto Perpétuo Program was analysed by the information obtained from interviews and researches. As an example of the private acting in the public sector, it was verified that the current expectations of management efficiency and transfer of resources, in quantity and quality, didn t come true. Nevertheless, the data published about the Program (resources invested, students and schools benefited) comparatively high in the face of other initiatives like that, were components of success in the construction of a positive image made by the promoters of this action for the public opinion. In the sum of these observations and other aspects analysed, it was possible to demonstrate that commercial interests prevailed over the declared motivations to assist the education. Although it was not possible to assert that the initiative has resulted in a private advancement redefining the public nature of the State and Municipal system of teaching reached by the Program, there are evidences that the implementation of the Moto Perpétuo was conditioned by the relationship between the public (Federal Government) and the private (automobiles company), representing an unheard-of chapter centred on the education, facing a survey that stands out agreements of mutual help of political-economical nature.
Hultman, Martin. "Full gas mot en (o)hållbar framtid : Förväntningar på bränsleceller och vätgas 1978 - 2005 i relation till svensk energi- och miljöpolitik." Doctoral thesis, Linköpings universitet, Tema teknik och social förändring, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60061.
At the turn of the millennium, high expectations were connected to a technologycalled fuel cells. It was said that it could contribute in a significant way to solvingthe problem of increasing greenhouse gas concentrations in the atmosphere andreverse the greenhouse effect. But this was not the first time fuel cells andhydrogen has been described as a technology for the future and connected todifferent kind of utopias. On the contrary, this technology has a history ofexpectations connected to it and in this dissertation the period 1978 – 2005 isanalysed with focus on reoccurring arguments, main actors and how descriptionsof expectations move between different locations and different periods of time.These questions are answered with an analysis of empirical material that containsgovernmental reports, mass media articles, scientific reports as well as field notesfrom an participatory study. In this dissertation the analysis is read together withprevious research regarding Swedish energy- and environmental politics as wellas international research about fuel cell and hydrogen. The investigation is alsoinformed by theories about utopia and sociology of expectations. The main conclusion to be drawn from the historical period 1978 – 2005 is thatthe utopia hydrogen and fuel cells are said to be parts of change, from differentpossible hydrogen societies to one hydrogen economy. This change can beexemplified with changing roles of science, technology and the state as well ashow former environmental activists and political parties change their values.
Aeschlimann, Raphaël. "Magnetic and transport properties of rare-earth titanate thin films and heterostructures." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS142.
Transition metal oxides possess a broad range of functionalities (superconductivity, magnetism, ferroelectricity, multiferroicity) stemming from the interplay between structural effects and electronic correlations. Recent work has revealed exciting physics at their interfaces, including conductivity and superconductivity in the two-dimensional electron system (2DES) that forms at the interface between two band insulators, LaAlO₃ and SrTiO₃. However, to embrace the immense potential of oxide interfaces and unveil unprecedented electronic phases, combining insulators with stronger electronic correlations is necessary. At the crossroad between strongly correlated electron physics, magnetism and spintronics, the present thesis project aims to harness electronic and magnetic instabilities in correlated oxides to craft new electronic phases controllable by external stimuli. We investigated rareearth titanates RTiO₃, a relatively unexplored family of Mott insulating perovskites with a crossover between antiferromagnetic and ferromagnetic orders upon changing the rare-earth size. Contrary to most previous works, we focused on ferromagnetic compounds, and their integration in 2DES. The thesis developed along two main axes. First, we explored several members of the rare-earth titanates family in epitaxial thin film form. We highlighted the presence of a magnetically active dead layer at the surface of thin films and established its origin as due to the overoxidation of titanium ions. We also studied the presence of an unexpected orbital moment carried by the titanium in some compounds, and discussed it in the light of the non-collinear spin arrangement promoted by the rare-earth orbital moment and of a structural gradient evidenced by transmission electron microscopy. In a second stage, we combined DyTiO₃ with SrTiO₃ to stabilize a conducting interface with puzzling magnetotransport properties that we interpreted with a model involving spin-orbit coupling as well as induced magnetism
Rupp, Jonathan Amadeus Johannes [Verfasser], Rainer [Akademischer Betreuer] Waser, and Max Christian [Akademischer Betreuer] Lemme. "Synthesis and resistive switching mechanisms of mott insulators based on undoped and Cr-doped vanadium oxide thin films : as function of nanostructure and material properties / Jonathan Amadeus Rupp ; Rainer Waser, Max Christian Lemme." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1218019719/34.
Ström, Kristina. "Livscykelanalysen som metod mot ökad miljöhänsyn och hushållning av energi och material : En fallstudie med utvärdering av verktyg anpassade för LCA på byggnader." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-88700.
D'AMICO, MICHELE EUGENIO. "Soil ecology and pedogenesis on ophiolitic materials in the western Alps (Mont Avic Natural Park, North-western Italy): soil properties and their relationships with substrate, vegetation and biological activity." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/10401.
Hägg, Marcus, and Henrik Sjölund. "Fuktvandring i putsade lättbetong- och tegelfasader : En undersökning om hur fukt vandrar och beter sig mot en putsfasad av två olika material med olika porositeter." Thesis, KTH, Byggteknik och design, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-126949.
Today there’s a great deal of buildings in Sweden where the facade is constructed by plaster directly connected to either aerated concrete or masonry brick. These facades could create problems for the user on accord of the moisture transport via the plaster directly into the construction. The problems that could follow these types of facades aren’t just esthetical but could also affect the indoor environment. The purpose with this study was to examine if it would be possible using today’s technology to show the results coming from past experiences by practical work, and at the same time examine how a remodel affects the facades that consists of plaster directly on aerated concrete or masonry brick. The work has been conducted with the simulation program Wufi Pro, later to be analyzed according to moisture transport and water content. The results that came from this has shown an increased risk for problems with the original facades and at the same time that a remodel according to one of the two proposed remodel ways to prefer.
Coy, Diaz Horacio. "Preparation and Characterization of Van der Waals Heterostructures." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6212.
Rohloff, Martin [Verfasser], Anna [Akademischer Betreuer] Fischer, Arne [Gutachter] Thomas, and Anna [Gutachter] Fischer. "BiVO4-based photoanodes for photoelectrochemical water splitting : towards strategies to overcome major drawbacks of the most promising photoanode material / Martin Rohloff ; Gutachter: Arne Thomas, Anna Fischer ; Betreuer: Anna Fischer." Berlin : Technische Universität Berlin, 2018. http://d-nb.info/1164076418/34.
Paul, Anne. "Modélisation numérique des déformations d'un édifice volcanique : applications au Mont St Helens." Grenoble 1, 1986. http://www.theses.fr/1986GRE10006.
Moses, Kenneth C. "Biomimicry of the Hawk Moth, Manduca sexta (L.): Forewing and Thorax Emulation for Flapping-Wing Micro Aerial Vehicle Development." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case158687503705972.
Zerrad, Mehdi. "Caractérisation expérimentale et modélisation numérique du comportement vibratoire des matériaux polymères chargés en fibres courtes : Application à un carter d’huile de Groupe Moto-Propulseur thermique d’automobiles." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI064.
As European standards for CO2 emissions are becoming more stringent, car manufacturers are seeking, among other strategies, to lighten their vehicles to reduce their consumption. Thus, the replacement of metal parts by others made from lighter materials such as polymeric composite materials filled with short fibers is increasingly used in the automotive industry. However, during the design process, engineers face difficulties when trying to numerically model the vibro-acoustic response of these parts and / or assemblies. Indeed, these materials are very sensitive to external parameters such as temperature, loading frequency and humidity. In addition, their behavior also depends on the injection process which has an influence on their local microstructure and more particularly on the orientation and dispersion of the reinforcing fillers. In turn, their numerical modeling is complex and the comparison with the experimental measurements unsatisfactory. In this research work, the influence of the ambient parameters on the dynamic behavior of an oil pan made of polyamide 6 reinforced with 35\% by mass of glass fibers was studied. Local mechanical and microstructural characterizations were performed to investigate the relationship between the microstructure and the properties of these composite materials. A numerical model was then developed on the basis of these experimental studies and allowed to evaluate the influence of the microstructure on the vibratory behavior of a model plate system. Finally, computation / test correlations were performed to compare the numerical modeling method to the measurements. These studies have made it possible to highlight the sensitivity of these materials to their environment, to establish a hierarchy of the influence of the various parameters on their vibration behavior and to propose a "low cost" numerical methodology based on the experimental characterization of constituent elements taken separately
Teggi, Gloria. "Il problema dei due corpi." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12108/.
Gutekvist, Olsson Cecilia, and Fanny Norkko. "Omvänd logistik - vägen mot hållbar utveckling? : Hur ökad återanvändning av byggmaterial i samverkan kan bidra till en mer cirkulär ekonomi på byggarbetsplatser." Thesis, KTH, Fastigheter och byggande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264396.
In the past decades the planet has, due to human overuse of resources, undergone climate change and global warming. Because of the projected increase of the population as well as the urbanization that has been going on the last 40 years, where more people seek towards metropolitan areas, it will result in an increased construction of housing. This will result in challenges considering the fact that the construction sector today represents a significant part of society's negative climate impact from a life-cycle perspective. One factor contributing to the negative climate effect given by the construction industry is its unsustainable waste management in which a significant part of the wasted materials is reusable. For this reason, the purpose of this research has been to investigate whether reverse logistics, targeted at reuse of construction materials, in collaboration between contractors in limited urban areas can reduce waste materials for sustainable development. The theoretical framework identified in this study, from which the result obtained originates and the conclusions are drawn, consists primarily of three theories: sustainable development, circular economy and reverse logistics. Sustainable development with its three dimensions: social, ecological and economic sustainability is aimed to reach the optimal stage in which resources are consumed in a sustainable way as possible. Circular economy is a process where used material is used as long as possible in a circular cycle with the ability to organize and optimize sustainable material flows, this by conserving resources and reducing waste. Lastly, reverse logistics is a branch within the common logistics that manage products of any kind after usage with an efficient management that either creates new value or a proper disposal. The results are based on a qualitative method with interviews supplemented by quantitative data from a questionnaire. The results confirm what constitutes the study's problem of today's unsustainable waste management in which still usable materials are discarded, whereupon the mean value of eight percent of the total waste is estimated to still be usable. The materials with the greatest potential for reuse are wood, board materials of various kinds, insulation, reinforcement bars and steel joists. Regarding the study's focus on increasing reuse in collaboration between contractors, a general positive attitude is seen towards it and there is an insight in the fact that solving the problem of today's unsustainable waste management will be difficult without collaboration. However, this is given by the fact that the challenges identified can be solved. The identified challenges in the study were mainly problems with quality assurance on reusable materials, inventory and resource inefficiency. In this study it has emerged that when it comes to starting reuse in collaboration consisting all types of building materials, there are factors that must be resolved before it will be possible. Something that stands in the way of implementing it today. On the other hand, there are no major obstacles towards reusing standardized building materials for temporary work since the quality assurance issue in the form of a guarantee is not relevant and that there is a need for such material during the entire building process, which solves the problem of inventory. To begin work on this, digital platforms that already exist today could be used as a marketplace, where a restriction is placed on who may buy the material. It could also be as simple as keeping a closer communication between projects. Finally it can be concluded that, after a period of time, an implementation of this type of reverse logistics, focused on reuse in collaboration, will be able to reduce the amount of waste compared to today. This will create a more circular economy in limited urban areas, whilst contributing to a more sustainable development.
Karlsson, Oscar, and Oskar Hjalmarsson. "Effektivare material-och produktionsstyrning för minskad genomloppstid i en process hos ett företag med funktionell layout : En fallstudie på Press Kogyo Sweden AB." Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104538.
Background: Today's markets have over time tended to become more global, which in turn has increased competition between companies. This has meant that many industry organizations have had to change in order to be competitive in the market. A concept that today permeates many companies is the lean practice, which is based on maximizing the use of resources, eliminating waste, and creating more efficient production. By working with lean, companies can achieve faster throughput time. For manufacturing industrial companies, a reduction in throughput time can generate various benefits. Some of these advantages are: reduced number of products in work, better quality, reduced costs, better forecasts, increased flexibility and reduced lead time towards customers.Press Kogyo has for a long period experienced problems with one of their processes. The main problem has been that they do not know what non-value-added activities/waste that can be found in the process and how these activitiesaffect the total throughput time of the process. Purpose: The purpose of the study is to map Press Kogyo's propeller process in order to be able to identify non-value-adding activities in the process. Furthermore, the study will provide Press Kogyo with proposals regarding how more efficient material and production control can reduce the throughput time in the propeller process. In order for the study to achieve theoretical relevance, another purpose of the study is to contribute with theories about how manufacturing companies, with a functional layout, can reduce the disadvantages of the layout with more efficient material and production control. Methodology: The study has been divided into three research questions. The first two research questions were specifically aimed at Press Kogyo, while the third research question was more generally directed at manufacturing companies with a functional layout. The study was conducted as a case study and was characterized by qualitative research methods. Empirical data has been collected through interviews, observations, and a focus group. For the first research question, process maps and VSM maps were created. This together with various interviews created the foundation for identifying non-value-adding activities/waste in the propeller process which affected the throughput time. For research question two, theory of material and production control was applied in order to reduce the non-value-adding activities/waste and consequently reduce throughput time in the process. Regarding research question three, interviews were conducted with Press Kogyo and another manufacturing company with a functional layout. The authors intended to, through these interviews, find answers to how manufacturing companies with a functional layout can reduce the disadvantages of the layout with the help of efficient material and production control. Conclusions: In the study, seven wastes were identified where “wait” was considered to be the waste that affected throughput time the most in the propeller process. To eliminate all waste and specifically the waste “wait”, methods and theories regarding material and production control was applied with a focus on production activity control (PAC). All the different theories that was used also created a theoretical model which can be a good basis for planning when companies with a functional layout want to find ways tostreamline their planning. Some parts of the theoretical model were also used later in the study where it was used to reduce the disadvantages that may exist with a functional layout
Andersson, Tommy. "Redesign av reduktionsutrustning i asselvalsverk inom stålindustri : Ett examensarbete utfört på konstruktionsbyrån BEKAB mot stålindustriföretaget Ovako." Thesis, Linköpings universitet, Maskinkonstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108786.
The interest in seamless steel tubes with large outside diameters in relation to thin wall thickness has increased along with the strength improvements in various steel grades. This makes it possible to produce lighter, cheaper and more material-efficient steel products with the same or greater strength as before. These new development directions bring changes and challenges in one of the company Ovako's production lines in Tube Mill 5 Hofors, which they need to cooperate with the design agency BEKAB to evaluate and develop. In Ovako's production line in Tube Mill 5 there is a part of an assel mill called "förreducerare". Ovako sees a lot of interest in evaluating and developing this part of the assel mill in order to better adapt to the new development directions. A well-known challenge of the existing reduction equipment is that it was initially developed to reduce a quality issue with the tube products called funnel formation. The project therefore immerses itself into the funnel formation in order to better understand the foundations of the current design of the reduction equipment and to then implement a redesign of the reduction equipment. A situation analysis of the current reduction equipment reveals a number of different production issues with their accompanying quality issues in the tube products. The project thus chooses to focus on the production issues that would have the greatest impact on the reduction equipment if they were resolved. This results in a new product concept of the reduction equipment in the form of a visual 3D-CAD-model with associated strength calculations and material optimization. The study covers topics such as design, engineering, product development, material strength calculations and material optimization.
Bravenec, David. "Diagnostika a návrh eliminace tepelných mostů budov." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265536.
Jacobsen, Jan Kindberg. "Greek pottery on the Timpone della Motta and in the Sibaritide from c. 780 to 620 BC reception, distribution and an evaluation of Greek pottery as a source material for the study of Greek influence before and after the founding of ancient Sybaris /." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/304182907.
Le, Losq Charles. "Rôle des éléments alcalins et de l'eau sur les propriétés et la structure des aluminosilicates fondus et vitreux : implications volcanologiques." Phd thesis, Université Paris-Diderot - Paris VII, 2012. http://tel.archives-ouvertes.fr/tel-00923471.
Guillemot, François. "Couches poreuses de silice structurées par des latex : structure, propriétés mécaniques et applications optiques." Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00543809.
Eriksson, Andreas, and Gabriel Ågren. "Materialtester på KL-trä : Undersökning av KL-träets tryckkraftskapacitet och tryckhållfasthet samt teoretiska beräkningar och praktiska tester av en KL-trä bräda." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85125.
Compression perpendicular to the grain is today a problem with tall wood buildings with timber-frame at, for example, the meeting between timber stud and the bottom rail. A material that has become increasingly popular in Sweden is cross-laminated timber, which is referred to as CLT, where lamellae are glued together crosswise to a board. Experiments have previously been performed on the material and it has shownthat a board made of CLT, which is not manufactured today, can withstand a higher pressure than an ordinary board made of structural timber, which could be a solution to the problems with compression perpendicular to the grain in tall wood buildings. The purpose of this thesis is to determine the CLTs characteristic compressive force capacity and compressive strength for two formations of CLT where proportions of perpendicular and parallel lamellae that are loaded in the cross section differ. It will also be investigated how loads are distributed on the lamellae which are loaded parallel to the grain and perpendicular to the grain in a board made of CLT and that theoretical calculations of the compressive force capacity were performed in the middle and at the end of the board. The thesis was comprised of three different methods where the standard SS-EN 408 for compression perpendicular to the grain was used to determine compressive forcecapacity and compressive strength for the two formations of CLT through material tests in a hydraulic press. The load distribution between the lamellae in a CLT-boardwas examined by compression tests at the end of the board and reflects a real meeting between a timber stud and the bottom rail. A solid board made of CLT, a board where the perpendicular lamellae were sawn off and a board made of structural timber were loaded to investigate the difference in compression. Theoretical calculations were performed on the CLT-boards both in the middle and at the end through calculating the different lamellae as individual boards according to Eurocode 5 and EKS11 and then all lamellae for the CLT-board were summed. The results showed that the arrangement of CLT with the largest proportion of lamellae parallel to the grain obtained the largest compressive force capacity and had the highest compressive strength. In the CLT-board, the parallel-loaded lamellae took up about four-fifths of the load in the cross-section that was loaded. The theoretical calculations performed gave a lower compressive force capacity than the results of the experimental tests. For material test 1 where the lamellae were distributed 58% perpendicular lamellaeand 42% parallel lamellae, characteristic values of 79.7 kN on compressive capacity and 18.6 MPa on compressive strength were obtained. For material test 2 where the lamellae were distributed 42% perpendicular lamellae and 58% parallel lamellae, characteristic values of 114.6 kN on compressive capacity and 26.8 MPa on compressive strength were obtained. The load distribution in the CLT-plank shown that the parallel-loaded lamellae took up a load corresponding to 80.8% and the perpendicular lamellae took up a load corresponding to 19.2%. The theoretical calculations were used to 57% in comparison with the maximum load from the experimental test, both in the middle and at the end of the board.