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Zerlim, Anelisa. "Estudo da dissolução de vidros niobofosfato em água e em solução simuladora de fluído fisiológico." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-10102011-142406/.
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A busca pelo prolongamento da qualidade da vida tem incentivado o aparecimento de novos materiais. Vidros que possuem fosfato em sua composição têm encontrado um grande espaço em aplicações como biomateriais, e sua utilização como scaffolds pode ser promissora, pois além de sua estrutura ser mais próxima da parte mineral dos tecidos ósseos, eles são materiais com alta solubilidade em meios aquosos. Vidros niobofosfato foram estudados em trabalhos anteriores e provou-se que a adição de óxido de nióbio em vidros fosfato melhora sua durabilidade química. Há também estudos que revelam que o óxido de nióbio pode ser utilizado como biomaterial devido a sua biocompatibilidade. Neste trabalho determinou-se a taxa de dissolução de uma ampla faixa de composições de vidros niobofosfato em soluções aquosas, e em soluções simuladoras de fluído corpóreo (SBF), com diferentes condições de ensaio. Os vidros estudados neste trabalho com composições (32 - 37)P2O5 (2- 15)Nb2O5 (6-7)Na2O (46-53)CaO, % em mol, foram produzidos a partir da mistura e fusão dos precursores em forno elétrico na faixa de temperatura de 1300ºC - 1400ºC por 0,3h. Foram produzidos sete tipos de vidros com composições diferentes, tendo como base a variação do teor de óxido de nióbio. Os vidros foram submetidos a análises de citotoxicidade e foram considerados não citotóxicos. Análises por difração de raios X mostraram que os materiais são amorfos e não se observou a presença de fases cristalinas após imersão tanto em solução aquosa, quanto em SBF. A densidade dos vidros variou de 2,84 a 3,14 g/cm3 em função do teor de óxido de nióbio. Observou-se a perda de massa dos vidros imersos em água e em SBF a 37ºC por 21 dias, sendo que a taxa de dissolução é maior quanto menor o teor de nióbio. As taxas de dissolução também variam de acordo com as condições de imersão das amostras. Micrografias eletrônicas de varredura mostraram a superfície das amostras antes e após imersão. Observou-se a formação de trincas nas superfícies de algumas amostras, resultado da liberação de matéria para o meio lixiviante. Houve aparente formação de uma camada superficial em uma determinada composição. Análises por espectrometria de fluorescência de raios X por energia dispersiva (EDX) determinaram os teores dos elementos presentes nas composições dos vidros, antes e após as imersões. Observou-se a presença de Al2O3, resultado da contaminação do vidro pelo cadinho, e também uma variação significativa no teor de P2O5 causado pela volatilização do mesmo no processo de obtenção do vidro. A variação dos teores dos elementos na superfície de alguns vidros após os períodos de imersão é causada principalmente pela liberação preferencial de P, Na, Al. Os teores dos elementos P, Na, Nb e Ca foram determinados por EDX nas soluções aquosas utilizadas para os testes de lixiviação.The need to extend and improve the quality of life is leading to the search of new materials. Glasses containing phosphorous in their compositions are considered biomaterials and can be used as scaffolds because they have a structure close to the mineral component of bone tissues, and present relatively high solubility in water. The chemical composition, morphology, and mechanical properties of bioactive glasses can be properly fit to allow bonding with bones. Niobium phosphate glasses have been previously investigated. The addition of niobium oxide improves the chemical durability of phosphate glasses, and they are considered biocompatible. In the present work the dissolution rate of a wide range of niobium phosphate glass compositions were determined in water and Simulated Body Fluid (SBF). The glass compositions were in the range (32 - 37)P2O5 (2-15)Nb2O5 (6-7)Na2O (46-53)CaO mol%, and they were prepared by melting reagent grade chemical compounds in the temperature range 1300ºC - 1400ºC for 0.3h in an electrical furnace. Seven different glasses were prepared. The glasses were considered non-toxic after performing cytotoxicity tests. No evidence of crystalline phases was observed on X-rays diffraction patterns before and after the corrosion tests. The glass densities are in the range of 2.84 - 3.14 g/cm3. The density increases as the amount of niobium oxide increases. A mass loss was determined after immersing glass samples in water and in SBF at 37ºC during 21 days. The dissolution rate decreases as the amount of niobium oxide increases. The dissolution rate depends on the immersion medium and conditions. Cracks on the glass surfaces were observed by scanning electron microscopy after the corrosion tests which are related to the material release from the glass surface to the liquid. There is also evidence of formation of a layer on the surface of a specific glass composition. The glass compositions were determined before and after the corrosion tests by X-ray Fluorescence Spectrometry (EDS). Aluminum was detected in the glass composition. This element is related to the contamination of the glass by the crucible used in the glass melting. A significant variation of the amount of P2O5 compared to the nominal composition was also noticed, due to the volatilization of phosphorous during the glass melting. The surface glass composition changes during the leaching tests in water or SBF because of the preferential release of P, Na, and Al. EDS was also used to determine the concentration of P, Na, Nb, and Ca in the leaching solution by using the dry drop method.
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Ročňáková, Ivana. "Korozní degradace hořčíkových slitin v SBF roztocích." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216843.
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Nowadays, magnesium alloys are used in many sectors of human activity, particularly in the aerospace and automotive industries, due to a combination of good mechanical properties and low density of magnesium. Recently, however, the attention is paid to the possibility of using magnesium alloys in the medical field, mainly due to the chemical properties of magnesium. The diploma thesis is focused on evaluating of the corrosion behavior of AZ31alloy and AZ61 alloys in SBF solutions that are solutions simulating body fluids. The alloys were subjected to immersion test in Hank’s solutions for time span from 24 to 1008 hours. The corrosion process was evaluated based on several factors: alloy composition, time and pH changes. The thesis also describes in detail the methodology for establishing magnesium and zinc by method of flame absorption spektrometry (F AAS). The determination of aluminum was carried out by atomic absorption spectrometry with electrothermal atomization (ET AAS).
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Halbig, Kari Michele. "Multiple roles for the zebrafish transcriptional activator SBF/Staf." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2653.
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Slouková, Karolína. "Hodnocení elektrochemických charakteristik tvářených hořčíkových slitin typu Mg-Al-Zn." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240550.
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The aim of this master’s thesis is electrochemical characteristics evaluation of magnesium alloys. The theoretical part describes the properties of magnesium and its alloys and their corrosion characteristics. In the experimental part are presented results of corrosion resistance measurement of two types of wrought magnesium alloys. It was AZ31 and AZ61 magnesium alloys, which were measured in Hank’s solutions with addition of ions Ca2+ and Mg2+ (SBF+) and without addition of the ions (SBF). The solution temperature during the measurement was 37 ± 1 °C. The experiments were used electrochemical impedance spectroscopy (EIS) and potentiodynamic tests using linear polarization (LP). EIS measurements were done in times of 5 minutes, 1, 2, 4, 8, 12, 24, 48, 72, 96 and 168 hours. Potentiodynamic tests were only short-term and they started after 5 minutes of stabilization. Both methods were used for measuring the electrochemical characteristics of polished and ground surface of the samples. The most important measurement results were polarization resistance, corrosion potential and corrosion current density. The electrochemical measurements are used to estimate the chemical composition influence and alloy’s structure of the corrosion resistance.
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Baetz, Kristin Kitty. "Multiple levels of regulation of the G(1) transcription factor SBF." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0015/NQ53798.pdf.
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Balgová, Zuzana. "Syntéza a vlastnosti biokompozitních materiálů s potenciálním využitím v medicíně." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-233381.
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Dizertační práce se zabývala syntézou a studiem kompozitních materiálů pro potenciální lékařské využití. Teoretická část je zaměřena na biomateriály, zejména na kompozity složené z polyvinylalkoholu a hydroxyapatitu(PVA/HA). Byly připraveny kompozitní membrány složené z polyvinylalkoholu s různým hmotnostním zastoupením hydroxyapatitu - 0%, 10%, 20%, 30%, 40% a 50%. Hydroxyapatit (HA) byl připraven srážecí metodou z hydrogenfosforečnanu amonného a tetrahydrátu dusičnanu vápenatého ve vodném alkalickém prostředí. Vzniklá suspenze se smísila s roztokem polyvinylalkoholu, který byl připraven rozpuštěním ve vodě o teplotě 85° C. Jednotlivé směsi byly odlity do formy a sušeny po dobu 7 dní při teplotě 30 ° C, vzniklé 0,5 mm tenké membrány byly analyzovány ATR-FTIR spektroskopií k identifikaci funkčních skupin v kompozitu, dále byla provedena XRD analýza. Zkouška tahem a TGA měření byly realizovány k určení vlivu HA na mechanické vlastnosti, respektive změnu tepelné odolnosti kompozitů ve srovnání s čistým PVA. Byla provedena zkouška bioaktivity v simulovaném krevním roztoku (SBF) po dobu 2h, 7 a 28 dnů. SEM byla použita k charakterizaci povrchové mikrostruktury biocompositních membrán před a po ponoření do SBF. Na povrchu testovaných membrán vznikla vrstva apatitu, která je charakteristická pro bioaktivní materiály. Bylo zjištěno, že s rostoucím množstvím HA částic docházelo ke vzniku aglomerátů v kompozitu, které vznikly mimo jiné jako důsledek růstu krystalů HA během sušení membrán. Bioaktivita rostla s delším působením SBF na vzorky.
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Derbel, Thameur. "Les anomalies dans les rentabilités boursières à la bourse de Paris : les effets EPR, taille, prix et volume de transaction." Paris 9, 1991. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1991PA090036.
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Les études antérieures aux Etats-Unis n'ont pas tranché la relation entre les anomalies EPR et taille. Cette étude réexamine ces deux effets sur une période relativement importante (1980-1990), en utilisant le modèle économétrique de Zellener (1962) en mettant l'accent sur les différences entre le mois de janvier et les autres mois de l'année. Les effets sont significatifs sur tous les mois de la période, en janvier et en dehors du mois de janvier. En revanche, l'effet taille n'est significativement positif en janvier que pour les sociétés à forte capitalisation. Un autre effet est également mis en évidence: des rentabilités anormales positives sont constatées pour les sociétés déficitaires quelle que soit la tailleThe research undertaken in United States concerning the relation between stocks returns and the effects of size and earnings to price ratio (EPR) is not clear-cut. This study re-examines these two effects with a substantially longer sample period (1980-1990); both portfolio and seemingly unrelated regression tests from zellner (1962) and an emphasis on the important differences between January and other months. Over the entire period, the earnings yield effect is significant in both January and other months. Conversely, the size effects are significantly positive only in January for the largest firms. We also find evidence of consistently high returns for firms of all sizes with negative earnings
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Aguiar, Amanda Abati. "Avaliação do recobrimento biomimétrico em compósitos de alumina-zircônia texturizadas superficialmente com laser de femtossegundo." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-29042013-095446/.
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O principal objetivo deste trabalho foi estudar a influência do tratamento superficial com laser de femtossegundo em amostras de alumina e compósito de alumina-zircônia estabilizada com ítria para depósito e aderência de apatita. Os resultados obtidos mostraram que houve a formação de apatita sobre as superfícies das amostras que foram texturizadas com laser de femtossegundo e em seguida imersa em 1,5 SBF. Este método biomimético pôde, por conseguinte, tornar estas cerâmicas bioativas. Também houve a formação de apatita na superfície das amostras sem o tratamento a laser. Os efeitos da texturização na superfície para as diferentes cerâmicas e a influência do tempo de imersão em 1,5 SBF são discutidos, a fim de determinar a condição ótima para estimular a deposição e a adesão da apatita na superfície dos materiais. Finalmente, os resultados obtidos das diferentes análises são comparados. A adesão da hidroxiapatita é essencial para interação com o substrato e depende das propriedades das superfícies dos materiais. A qualidade desta adesão influenciará sua morfologia e a capacidade futura de osseointegração. As características de superfície dependem da química de superfície, energia de superfície e topografia de superfície. Geralmente, a reatividade de superfície e energia de superfície pode ser influenciada pelas características de molhabilidade, influenciando o desempenho de biomateriais. A adesão e crescimento da apatita depositada também é função da rugosidade superficial. O tratamento superficial com laser de femtossegundo melhora consideravelmente a adesão da apatita obtida pelo recobrimento biomimético nas superfícies dos materiais.The main objective of this work was to study the influence of femtosecond laser surface treatment on samples of alumina and composite of zirconia-alumina yttria stabilized for deposit and adhesion of apatite. The results showed that there was apatite formation on the surfaces of the samples that have been textured with femtosecond laser and then immersed in SBF 1.5. This biomimetic method can therefore make these bioactive ceramics. There was also the formation of apatite in the samples without laser treatment. The effects of texturing surface for the different ceramics and the influence of immersion time in SBF 1.5 are discussed in order to determine the optimal conditions to promote the deposition and the adhesion of the apatite in the material`s surface. Finally, the results of the different analyzes are compared. The adhesion of hydroxyapatite is essential for interaction with the substrate and depends on the properties of material´s surface. The quality of this adhesion will influence their morphology and the future ability of osseointegration. The surface characteristics depend on the surface chemical, surface energy and surface topography. Generally, the reactivity of surface and the energy of surface can be affected by wetting characteristics influencing the performance of biomaterials. The adhesion and growth of apatite deposited is also a function of surface roughness. The femtosecond laser surface treatment greatly improves the adhesion of apatite obtained by biomimetic coating on the surfaces of materials.
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Pala, Prashna Jatindra. "Biochemical and biophysical characterisation of the Saccharomyces cerevisiae cell-cycle transcription factors, SBF and MBF." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271258.
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Dutoit, Charles-Emmanuel. "Etude par résonance paramagnétique électronique des composés organiques (TMTTF)₂X (X=AsF₆,PF₆ et SbF₆)." Electronic Thesis or Diss., Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4334.
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Ce travail de thèse porte sur l'étude par la résonance paramagnétique électronique (RPE) des sels à transfert de charge quasi-unidimensionnels (TMTTF)₂X (X=AsF₆, PF₆, SbF₆), matériaux modèles de chaînes de spins quantiques. Tout d'abord, nous avons examiné en onde continue et sur une large gamme de température et de fréquence, la phase d'ordre de charge déjà observée dans ces matériaux en dessous de la température TCO. Nous avons mis en évidence deux nouveaux phénomènes à T≺TCO: la rotation des axes principaux du facteur g et une modification structurale liée à un dédoublement de la maille cristallographique. Un calcul de chimie quantique a été réalisé à l'aide de la méthode DFT confirmant nos résultats expérimentaux. Dans la seconde partie de ces travaux de thèse, nous avons présenté les résultats obtenus par RPE en onde continue et en onde pulsée sur l'étude des défauts corrélés dans les systèmes à chaînes de spins. En onde continue, nous avons détecté pour la première fois une raie RPE fine à basse température, suggérant la présence de défauts corrélés ayant les caractéristiques de solitons. Les mesures par RPE pulsée nous ont permis d'observer les premières oscillations de Rabi de solitons piégés et de déterminer leur caractère robuste. Ces derniers résultats offrent une approche alternative aux qubits à base de spins pour le traitement de l’information quantiqueThis thesis focuses on the study by Electron Paramagnetic Resonance (EPR) of the quasi-one-dimensional charge transfer salts (TMTTF)₂X (X=AsF₆, PF₆, SbF₆), model materials of quantum spin chains. First, we have examined in continuous wave and on a wide range of temperature and frequency, the charge-ordered phase already observed in these materials below the temperature TCO. We have identified two new phenomena at T≺TCO: the rotation of the principal axes of the g factor and a structural change related to a doubling of the unit cell parameter. A quantum chemical calculation was carried out using DFT confirming our experimental results. In the second part of the thesis, we have presented the results obtained by EPR in continuous wave and pulsed wave on the correlated defects study in spin chain systems. In continuous wave, we have detected for the first time a narrow EPR line at low temperature, suggesting the presence of correlated defects having the characteristics of solitons. The pulsed EPR measurements allowed us to observe the first Rabi oscillations of trapped solitons and to determine their robust character. These latter results offer an alternative approach for spin qubits in quantum information processing
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Elouadi, Sara. "Analyse des effets induits par l'actionnariat salarié sur la création de valeur partenariale des entreprises du SBF 250 : vers un modèle de la création de la valeur partenariale dans le contexte des entreprises du SBF 250." Thesis, Toulon, 2014. http://www.theses.fr/2014TOUL2005.
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L'actionnariat salarié (AS) constitue un levier important pour développer le sentiment d'appartenance des salariés à leur entreprise et les fédérer autour des objectifs stratégiques. Cette forme de participation traduit la cohésion interne et la fierté qui unissent les salariés à leur entreprise. En détenant des parts de propriété, les salariés actionnaires témoignent de leur confiance à l’égard de l’avenir de leur entreprise. Constatant le développement de l'actionnariat salarié et anticipant les implications profondes de cette pratique, le sujet de ma thèse propose d'étudier la particularité de ce double statut d'actionnaire-salarié et d'analyser les conséquences de la pratique de l'actionnariat salarié sur la création de la valeur partenariale. En s’appuyant sur les développements récents que nous suggère la littérature académique, la première partie de cette recherche se propose d’examiner, dans un premier temps, les effets induits par la pratique de l’actionnariat salarié sur les performances individuelle et organisationnelle, puis, dans un second temps la place privilégiée qu’occupe l’AS, en tant que levier de création de valeur partenariale. La seconde partie de cette recherche analyse de manière empirique la contribution de l’AS à la création de valeur partenariale, et plus précisément, mesure les effets attitudinaux et comportementaux de l’AS sur les différentes dimensions de ce construit dans le contexte des entreprises du SBF 250. Mots clés : actionnariat salarié, création de la valeur, valeur partenarialeEmployee share ownership (ESOP) is an important lever to expand the membership of employees in their company and unite them around the strategic objectives. The aim of employee ownership is to associate staff not only to the company's results or determining working conditions, but also giving him the opportunity to influence the destiny of the company. Noting the development of employee stock ownership and anticipating the profound implications of this practice, the subject of my thesis proposes to study the specificity of this dual status as a shareholder-employee and analyses the consequences of this practice on creating stakeholder value. The first part of this research seeks to examine at first the effects induced by the practice of employee share ownership on individual and organizational performance, then secondly the privileged place of ESOP as a lever to create stakeholder value. The second part of this research examines empirically the contribution of ESOP to create stakeholder value, and more precisely measure attitudinal and behavioural effects of ESOP on the different dimensions of this construct in the context of SBF 250 companies
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Persson, Kristine. "Att möta sorg i arbetet : En kvantitativ enkätundersökning över begravningsrådgivare anslutna till SBF (Sveriges Begravningsbyråers Förbund)." Thesis, Högskolan Dalarna, Sociologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:du-4520.
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This quantitative survey aims to highlight the impact of the meeting with the grief for customer advisers and representatives of funeral homes connected to the SBF (Sveriges Begravningsbyråers förbund). It also aims to demonstrate any differences between the sexes on this subject. Issues include: How does the person experience expectations and requirements in relation to their professional role? Does the person experience a personal impact due to the encounter with grief and death in their profession, in what way and to what extent? What consequences does the expectations, reactions and the possible impact result in for that person? What conditions does the person have to help cope with the professional role? Is there a gender difference in this experience? The theory base, which consists of theories taken from The Managed Heart: The commercialization of Human Feeling by Arlie Hochschild (2003) and descriptions taken from Yrke: begravningsentreprenör. Om utanförskap, döda kroppar, riter och professionalisering by Anna Davidsson Bremborg (2002), has been fundamental in both the preparatory work and the analysis. The population consists of those with client contact at funeral homes connected to the SBF. The questionnaire was answered through an internet page and the contact with the particiants were made via e-mail. The questionnaire consisted of 44 claims which were answered by how well the respondents agreed with them. The responses were then coded and calculations were made of mean and significance of these figures. Comparisons were made on several levels between the different variables in order to find patterns and indications. The results showed trends that the respondents to some extent experienced high demands in their profession, stress connected with the customer interactions and that this to some extent resulted in negative consequences. The results suggests that respondents were expected to and strove to go the "extra mile" to please the customers. The results also showed trends that the respondents enjoyed their work, experienced relatively good conditions in their profession and that the benefits outweighed the sacrifices. The results also showed an interesting pattern of that women, more than men, experience pressures and stress due to the encouter with grief at work, and that the higher education the respondents had the greater the impact. This study resulted in some interesting indications that can be used in further research.
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Gabteni, Héger. "Effet des normes IAS-IFRS sur la communication et l'information financière des sociétés du SBF 120." Paris 1, 2009. http://www.theses.fr/2009PA010056.
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Les normes IFRS constituent le référentiel comptable auquel toutes les sociétés cotées sur un marché européen doivent se soumettre à compter du 1er janvier 2005 pour la présentation de leurs comptes consolidés. L'objet de cette recherche est d'étudier l'impact de la transition au référentiel IFRS sur la communication et l'information financière des sociétés du SBF 120. Ainsi, nous avons procédé à la construction d'un score de publication volontaire et étudier l'évolution de la communication financière des sociétés du SBF 120 en période pré/post IFRS. Les résultats mettent en évidence un accroissement de la quantité de publication volontaire des sociétés. La seconde partie de la thèse est consacrée à l'analyse de la qualité de cette communication financière; les résultats du test ainsi mené révèlent une diminution de l'asymétrie d'information à l'issue de la transition au référentiel IFRS et confirment ainsi le caractère qualitatif du score de publication volontaire précédemment calculé.
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Miyake, Jon Hatsuo. "Analysis of SBF, an snRNA enhancer binding protein, and cloning of the chicken rreb-1 gene /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9805798.
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Flores, Garth. "A stochastic model for sewer base flows using Monte Carlo simulation." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96692.
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Thesis (MSc)--Stellenbosch University, 2015.ENGLISH ABSTRACT: This thesis deals with understanding and quantifying the components that make up sewage base flows (SBF). SBF is a steady flow that is ubiquitous in sewers, and is clearly seen when measuring the flow rate in the sewer between 03:00 and 04:00. The components of SBF are: ● return flow from residential night use, ● return flow from leaking plumbing, ● groundwater infiltration, ● stormwater inflow. By understanding each component of SBF, this research can answer the burning question as to how much of the SBF was due to plumbing leaks on residential properties. While previous work on SBF had been done, the work focused on groundwater ingress and stormwater inflows, and thus not much had been said about plumbing leaks. Furthermore, previous work focused on SBF as an isolated sewer related topic, whereas this research integrated SBF as both a sewer related topic and water conservation and demand management (WCDM) topic. Due to the high variability in each of the SBF components, a method of quantifying each component was developed using residential end-use modelling and Monte Carlo simulations. The author constructed the Leakage, Infiltration and Inflow Technique Model (LIFT Model). This stochastic model was built in MS Excel using the @Risk software add-on. The LIFT Model uses probability distributions to model the inflow variability. The results of the stochastic model were analysed and the findings discussed. This research can be used by water utilities as a tool to better understand the SBF in networks. Armed with this knowledge, water utilities could make informed decisions about how to best reduce the high SBF encountered in networks.
AFRIKAANSE OPSOMMING: Hierdie verhandeling bespreek die begrip en berekening van die komponente van riool nagvloei. Die nagvloei was duidelik wanneer die vloei in die rioolstelsel tussen 03:00 en 04:00 gemeet is. Die verskillende komponente van die nagvloei is: ● huishoudelike gebruik, ● lekkende krane en toilette, ● grondwaterinfiltrasie, en ● stormwaterinvloei. ’n Begrip van die komponente van nagvloei kan die brandende vraag van hoeveel nagvloei die gevolg van lekkende krane en toilette is, na aanleiding van die navorsing beantwoord. Vorige werk het op beter begrip van die grondwaterinfiltrasie en stormwaterinvloei gefokus en lekke het nie veel aandag geniet nie. Vorige werk het net op nagvloei as geïsoleerde rioolonderwerp gefokus, terwyl hierdie navorsing nagvloei as ’n onderwerp wat met riool verband hou, sowel as ’n waterverbruik- en behoeftebestuursonderwerp, ondersoek. As gevolg van die groot verskil tussen elk van die komponente van die nagvloei, is ’n metode ontwikkel wat elke komponent kwantifiseer deur gebruik te maak van eindgebruik-modelle en Monte Carlo-simulasies. Die outeur het die Leakage Infiltration and Inflow Technique Model (LIFT-Model) gebou. Hierdie stogastiese model is in MS Excel, met behulp van die @Risk sagtewarebyvoeging gebou. Die LIFT-Model gebruik waarskynlikheidverspreidings om invloeivariasie te modelleer. Die resultate van die stogastiese model is ontleed en die bevindinge bespreek. Hierdie navorsing mag moontlik deur watervoorsieningsmaatskapye as instrument gebruik word om nagvloei in rioolstelsels beter te verstaan. Hierdie nuwe kennis kan watervoorsieningsmaatskapye in staat stel om ingeligte besluite te neem rakende die beste metodes om te volg om nagvloei te verminder.
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ZOELFFEL, MARTINA. "Activation et fonctionalisation des alcanes legers (c#2 a c#5) en milieu superacide hf-sbf#5." Université Louis Pasteur (Strasbourg) (1971-2008), 1995. http://www.theses.fr/1995STR13068.
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L'utilisation de la technique de piegeage des carbocations par le monoxyde de carbone a permis d'evaluer les vitesses relatives de formation des carbocations a partir des alcanes. Les differents chemins competitifs sont compares en dosant les ions oxocarbenium formes, sous forme d'esters ethyliques. La protolyse directe, selective de la liaison c-h est limitee aux alcanes tertiaires, tandis que les alcanes lineaires dans le hf-sbf#5 reagissent preferentiellement par protolyse d'une liaison c-c. Les reactions du propane, du n-butane et du n-pentane ont montre que l'ionisation est auto-catalysee par les cations permettant des transferts d'hydrure des alcanes vers les ions deja formes, a une vitesse superieure a celle des activations par le proton superacide. Le superelectrophile cobr+ permet l'ionisation selective de la liaison c-h du propane. Par contre, pour le n-butane et le n-pentane la protolyse de la liaison c-c et les reactions de transfert d'hydrure qui en decoulent sont en concurrence avec l'oxydation par cobr+. L'etude de l'isomerisation des n-alcanes (c#4 et c#5) en milieu hf-sbf#5 a permis de mettre en evidence que l'etape limitative de ce processus etait le transfert d'hydrure de l'alcane lineaire vers le carbocation rearrange (tertiaire). Cette constatation est aussi valable pour l'isomerisation dans un milieu superacide faible (hso#3f)
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El, Ouazzani Mohammed Adil. "La décision de détention d'actifs liquides : motivations et conséquences : le cas des entreprises cotées au SBF 250." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0041/document.
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La décision de détention d’actifs liquides par les entreprises a fait l’objet de rares recherches. Pourtant,les entreprises françaises détiennent des niveaux importants de liquidités parmi leurs actifs. Ce travailvise à étudier théoriquement et empiriquement les motivations et les conséquences de la décision dedétention d’actifs liquides par les entreprises.La première partie de la thèse a pour objectif d’établir un état de l’art des théories explicatives ducomportement accumulateur de liquidités des entreprises. La deuxième partie cherche à testerempiriquement ces théories sur un échantillon de 202 entreprises françaises cotées au SBF 250. Il s’agit,d’un côté, de vérifier s’il existe un niveau optimal d’actifs liquides, de présenter les différents avantageset inconvénients de la détention de liquidités et de déterminer quels facteurs intrinsèques (financiers etorganisationnels) et macro-économiques influencent le niveau de liquidités, et d’un autre côté, d’estimerl’impact des actifs liquides sur l’investissement, la performance économique et financière ainsi que surla valeur de marché de l’entreprise. Le traitement de ces deux questions est articulé autour de l’étudedes rôles modérateurs des contraintes de financement, de la gouvernance d’entreprise et des conditionsmacroéconomiquesThe topic of corporate cash holdings has received relatively little attention from the academicresearchers. Yet, French firms hold significant cash reserves. This research aims to investigate,theoretically and empirically, the motivations and implications of the decision to hold cash.The first part of the thesis aims to provide a state of the art of the theories explaining corporate cashholding behavior. The second part seeks to empirically test these theories on a sample of 202 Frenchcompanies listed on the SBF 250. We first test the existence of an optimal level of liquid assets. Wesubsequently explore the advantages and disadvantages of holding cash before we examine the specific(financial and organizational) and macro-economic determinants of corporate cash levels. Finally, weestimate the impact of liquid assets on firms’ investment, performance and value and then we analyzethe moderating roles of financial constraints, corporate governance and macroeconomic conditions
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QUEIROZ, Robson Aurélio Silveira de. "Compósito de policaprolactona e carbonato de cálcio (PCLC) : um novo biomaterial para enxerto ósseo." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/1523.
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Previous issue date: 2006Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Compósitos feitos a partir do polímero policaprolactona e de carbonato de cálcio, chamados de PCLC, foram preparados por um processo de carbonatação, que consiste em incidir um fluxo constante de gás carbônico (CO2) em uma solução de metanol e hidróxido de cálcio por 6 horas e depois adicionar ao polímero diluído em diclorometano, após a secagem e evaporação dos solventes o material resultante é prensado no formato de pastilhas. Essas pastilhas foram então expostas, a uma solução simuladora de fluido corporal (SBF) sob temperatura constante de 37 0C, por períodos de 3, 6, 12 e 24 horas e por 7, 14, 21 e 28 dias, o que levou à deposição de estruturas do tipo apatita, semelhantes aos ossos humanos sobre sua superfície. Antes e após ser exposto ao SBF, o compósito PCLC foi analisado por diferentes técnicas de caracterização de materiais, tais como difratometria de raios-X, espectroscopia de infravermelho com transformada de Fourier (FTIR), calorimetria diferencial de varredura (DSC), microscopia eletrônica de varredura (MEV) e espectroscopia dispersiva de raios-X (EDX). Através dessa análise foi possível detectar a formação de apatitas na superfície do PCLC já a partir de 3 horas de exposição ao SBF, sendo a deposição de material inorgânico crescente com o tempo, ocorrendo variação de fases minerais e o aparecimento de hidroxiapatita após 21 dias, o que sugere a indicação do compósito PCLC como um promissor material para o desenvolvimento de implantes biocompatíveis a serem utilizados no corpo humano
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Ghaya, Houda. "L'implication du conseil d'administration dans le processus stratégique : analyse théorique et étude empirique sur les entreprises du SBF 250." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAB011.
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Durant ces dernières années, le phénomène de l’implication du Conseil d’Administration (CA) dans le processus stratégique occupe une place importante dans les recherches académiques et dans l’actualité économique. L’objectif de ce travail est de comprendre ce phénomène dans le contexte des entreprises françaises. Pour ce faire, nous l’appréhendons comme un processus intermédiaire entre ses facteurs déterminants (le système de gouvernance de l’entreprise et les caractéristiques du CA) et ses facteurs d’évaluation (la performance de l’entreprise). Nous mobilisons ainsi une démarche méthodologique mixte qui combine une étude qualitative exploratoire et une étude par questionnaire de recherche adressé aux dirigeants et administrateurs des entreprises du SBF 250. Ce travail montre que la diversité de nationalité, les compétences générales et relationnelles des administrateurs ainsi que la présence d’un comité stratégique favorisent l’implication du CA dans le processus stratégique. En étudiant l’effet de cette dernière sur la performance de l’entreprise, les résultats montrent que l’implication du CA dans le processus d’établissement des choix stratégiques représente une source de création de valeur. Par ailleurs, une forte implication des administrateurs dans le processus de mise en œuvre stratégique et de contrôle influence négativement la performance de l’entreprise. Appuyés par une typologie des modes d’implication du CA (ou des « profils-types » des CA), ces résultats mettent en évidence l’importance du style d’intervention des administrateurs dans le processus stratégique afin d’expliquer son influence sur la performance de l’entrepriseOver the past few years, research in corporate governance has devoted an increasing amount of attention to boards of directors’ involvement in the strategic decision making process. This doctoral study aims to understand this phenomenon in the French context. We apprehend it as an intermediate process between its determinant factors (corporate governance system and board characteristics) and its evaluation factors (corporate performance).Therefore, we mobilize a mixed methodological research approach that combines an exploratory qualitative study and a questionnaire survey addressed to managers and directors of the SBF 250 companies.This work shows positive and significant effect of the nationality diversity, the general and interpersonal skills of directors and the strategic committee on board members’ involvement in the strategic process. Moreover, empirical results highlight that board involvement in the process of establishing strategic choices makes an efficient contribution to the firm’s value creation. However, strong board involvement in the implementation and control process has a negative influence on corporate performance. Supported by a typology of board involvement’s forms (or "Boards’ Typical-Profiles"), these results emphasize the importance of directors’ forms of participation in different steps of the strategic process to explain its influence on corporate performance
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Paquin, Pauline. "Les effets de la surconfiance des dirigeants sur les décisions managériales : le cas des dirigeants français du SBF 120." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAB015.
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Cette thèse s’intéresse au biais de surconfiance des dirigeants et analyse ses effets sur les décisions comptables et financières. Après avoir défini les contours de ce biais, nous réalisons une revue de la littérature sur la surconfiance du dirigeant et de ses effets pour l’entreprise. Les recherches proposent des conclusions contrastées quant à ces effets. Pour tester les impacts de ce biais, nous réalisons une base de données originale et analysons le comportement des dirigeants du SBF 120 pour la période 2006–2016. Nous montrons que la surconfiance des dirigeants influe sur la sensibilité des investissements au cash-flow et sur la gestion du résultat. Un apport original de cette recherche est de montrer que des mécanismes de gouvernance efficaces peuvent mitiger les effets du biais ou au contraire les encourager en fonction des motivations de l’actionnaire de contrôle. Nous montrons également que l’appartenance du dirigeant à la famille de contrôle modifie l’expression de son biaisThis dissertation focuses on CEO’s overconfidence and analyze its effects on accounting and financial decisions. After having defined the outlines of this bias, we conduct a literature review on the CEO’s overconfidence and its effects for firms. Research offers mixed conclusions about these effects. To test the impacts of this bias, we set up an original database and analyze the behaviour of CEO’s of SBF-120 over the 2006-2016 period. We show that CEOs’ overconfidence affects the investment cash-flow sensitivity as well as earnings management. An original contribution of this research is to show that effective governance mechanisms can mitigate the effects of the bias or, on the contrary, encourage them, according to the motives of the controlling shareholder. We also show the fact that the CEO’s belonging to the controlling family modifies the expression of one’s bias
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Schweitzer, Nike, and Sanna Ohlsson. "Förstudie om ny standard för släcksystem i tunga gruvfordon : en analys av aktuell situation och framtida behov." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76257.
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En brand i en gruva skiljer sig åt jämfört med en brand i en byggnad. Vid brand i en undermarksanläggning uppstår ett omedelbart hot mot de människor som vistas där. Vid en gruvbrand påverkar faktorer såsom sikt, obefintligt dagsljusinsläpp och begränsade utrymningsmöjligheter. Händelserna vid en brand kan också orsaka kostsamma driftstopp i gruvproduktionen. Det finns även en tydlig skillnad i problematik vid räddningsinsatser. Vid en gruvbrand måste räddningstjänsten exempelvis beakta långa inträngningsvägar, begränsade ventilationsmöjligheter, risken för ras och osäker brandvattenförsörjning. Under de senaste tio åren har det inträffat i snitt 70 bränder per år i svenska gruvor, varav cirka hälften varit fordonsrelaterade. Idag installeras därför släcksystem i gruvfordon i syfte att försöka minimera den typen av bränder. För att kartlägga användandet och erfarenheterna av fordonssläcksystem samt undersöka vilka framtida behov som finns gällande gruvfordons släcksystem och regelverken inom ämnesområdet genomfördes denna förstudie i samråd med RISE. Förstudien baseras på semi-strukturerade intervjuer med respondenter som valts ut utifrån deras kunskap inom bränder i underjordsgruvor och släcksystem. Även statistik från Gruvindustrins arbetsmiljökommitté gällande bränder i gruvfordon sammanställdes och studerades. I intervjustudien framgår det att effektiviteten på dagens släcksystem är montörsberoende och att det finns anledning till att konkretisera regelverken och specificera hur släcksystemen bör optimeras. Studien pekar på att effektiviteten hos släcksystem bland annat påverkas av luftflöden, mekanisk påverkan och bristfällig skötsel av systemen. Flera respondenter poängterar även att mängden släckmedelsvätska som används i dagens system måste verifieras gentemot respektive gruvfordons riskprofil. Det finns också en tydlig problematik i verkställandet och noggrannheten av kontroll och underhåll av släcksystemen och respondenterna är eniga om att en förbättring är nödvändig. Studien visar att ett av de regelverk som tillämpas för släcksystem på fordon i gruvor i Sverige, SBF 127:16, inte beaktar problematiken med bränder i undermarksanläggningar. Det framgår även att de provningarna som genomförs på släcksystem delvis är baserade på information ifrån tidigt 90-tal. Vid verkställande av framtida regelverk bör större hänsyn tas till gruvindustrins specifika behov. År 2018 finns det även en osäkerhet kring fordonssläcksystemens prestanda. Gruvindustrin önskar släcksystem med tillhörande regelverk som är optimerade efter deras behov gällande fordon och miljö.
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Homes, Christopher C. "The far-infrared powder absorption spectra of bis-tetramethyltetraselenafulvalene salts [(TMTSF)₂X, X=(PF₆, AsF₆, SbF₆, BF₄, ClO₄ and ReO₄)]." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25891.
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The far-infrared powder absorption spectra from 20-250 cm⁻¹ have been examined in a series of six protonated and deuterated (TMTSF)₂X compounds, with X=PF₆, AsF₆ and SbF₆ (octahedral anions) and X=BF₄, ClO₄ and ReO₄ (tetrahedral anions) as a function of temperature from 10K to 290K . The octahedral-anion spectra are all very similar, having 4 sharp resonances which have been attributed to three lattice modes and one internal mode. These assignments were made on the basis of isotope shifts upon deuteration, and wave number temperature dependence. The intensity of the lines is roughly proportional to the d.c. conductivity, and indicate a phase transition around 12K. The spectra of the tetrahedral-anion compounds are also similar. They show, however, extra structure below the anion-ordering temperature, TAOI including a strong feature at 30 cm⁻¹. The 30 cm⁻¹ feature shows a magnetic field depedence and may be related to the superconductivity. Simple one- and two-dimensional models are presented that indicate that this feature may be due to the activation of a transverse acoustic zone-boundary phonon, due to zone-folding, which accompanies the formation of a superlattice created by the anion-ordering transition.
Extended measurements from 100-300 cm⁻¹ have been performed on protonated AsF₆ and SbF₆ compounds, allowing the identification of two internal modes. Extended measurements from 100-400 cm⁻¹ have been performed on protonated and deuterated BF₄ and ReO₄ compounds, which show internal modes of both the TMTSF and anion molecules, and a torsional mode of the TMTSF methyl groups. These assignments were made on the basis of isotope shifts upon deuteration an extensive published vibrational analysis of TMTSF.Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Nejjar, Wafae Nada. "Contribution à l'analyse des mécanismes de gouvernance explicatifs de la qualité de la communication financière : cas des entreprises du SBF 120." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00681588.
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Les manipulations qui ont faussé les résultats des grandes entreprises françaises ont remis en cause l‟efficacité des systèmes de gouvernance et ont suscité de multiples interrogations relatives à la fiabilité et la qualité des informations qu‟elles diffusent.Afin de trouver les éléments qui permettront d‟instaurer à nouveau un climat de confiance, cette thèse a pour objectif de déterminer les mécanismes de gouvernance explicatifs de la qualité de la communication financière. Pour répondre à cette problématique de recherche, nous avons analysé le lien entre la communication financière et la gouvernance puis, nous avons formulé, à partir des théories financières, un ensemble d‟hypothèses relatives à l‟influence du marché financier, de la géographie du capital et du conseil d‟administration sur la qualité de la communication financière.Pour tester ces hypothèses de recherche, nous avons construit un indice de mesure de la qualité de la communication financière. Une fois cet indice appliqué aux entreprises de notre échantillon, nous avons procédé à une analyse univariée et une analyse multivariée pour au final construire un modèle empirique des mécanismes de gouvernance explicatifs de la qualité de la communication financière des entreprises du SBF 120.
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Ben, Ayed-Koubaa Hanen. "L' impact des mécanismes internes de gouvernance sur la qualité de l'information produite et divulguée par l'entreprise : cas du SBF 120." Paris 1, 2010. http://www.theses.fr/2010PA010060.
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L’objectif de cette étude est d’étudier l’impact des mécanismes internes de gouvernance sur deux aspects de la politique comptable : la production et la diffusion. Plus précisément, nous cherchons à vérifier si les caractéristiques liées au conseil d’administration, si la structure de propriété et enfin si l’actionnariat salarié (notamment, au travers de sa représentation au sein du conseil d’administration) ont un impact sur la qualité de l’information produite et diffusée par l’entreprise. Les résultats obtenus, à partir d'un échantillon constitué de l'ensemble des entreprises industrielles et commerciales appartenant à l'indice SBF 120 entre 2002 et 2007, semblent indiquer que l'efficacité du conseil d'administration à améliorer la qualité de l'information produite par l'entreprise est liée à une taille accrue de cet organe ainsi qu'à la constitution d'un comité d'audit en son sein. La qualité de la communication financière se trouve quant à elle améliorée avec la constitution d'un comité de nomination au sein du conseil. Concernant la structure de propriété, l'hypothèse de l'expropriation des actionnaires minoritaires par les actionnaires contrôlant n'est pas corroborée. La présence des investisseurs institutionnels dans le capital des entreprises françaises améliore quant à elle, la qualité de la communication. Il n'en demeure pas moins que cette présence augmente la pratique de gestion des données comptables. De plus, le contrôle exercé par les institutionnels français est plus efficace. Enfin, la présence des salariés au sein du conseil d'administration contribue à l'efficacité du contrôle exercé par cet organe en matière de production de l'information comptable.
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El, Amrani Bouchta. "Analyse structurale de nouveaux conducteurs organiques : influence de la composition (TMTTF)₂ (SbF₆)₁-ₓ(AsF₆)ₓ ou de la température (DMtTSF)₂-ClO₄." Bordeaux 1, 1986. http://www.theses.fr/1986BOR10601.
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CARACTERISATION DES SOLUTIONS SOLIDES (TMTTF)₂ (SbF₆)₁-ₓ(AsF₆)ₓ PAR ANALYSE DES STRUCTURES ET A PARTIR DE LA NOTION DE TENSEUR DE DEFORMATION COMPOSITIONNELLE. LA MISE AU POINT D'UNE CHAMBRE DE DIFFRACTION DE LAUEE, FONCTIONNANT A TRES BASSE TEMPERATURE PERMET LA MISE EN EVIDENCE D'UN CHANGEMENT STRUCTURAL POUR LE SEL (DMTTSF)₂ CLO₄ DONT LA DESCRIPTION FAIT INTERVENIR SUR UNE GAMME REDUITE DE TEMPERATURE UNE PHASE PROBABLEMENT CHAOTIQUE
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TRAETTEBERG, OLA. "Le mode collectif de l'onde de densite de spin dans les composes (tmtsf)#2(asf#6)#1##x(sbf#6)#x." Paris 11, 1993. http://www.theses.fr/1993PA112141.
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Nous avons etudie l'effet sur le diagramme de phase et sur le transport du mode collectif de l'onde de densite de spin (ods) en fonction du desordre dans des alliages de conducteurs organiques: (tmtsf)#2(asf#6)#1##x(sbf#6)#x, ou la concentration x varie de 0 a 1. L'effet du desordre sur les proprietes a une particule et le diagramme de phase est faible mais sensible. L'effet sur l'accrochage de l'ods est grand, ce qui est observe dans le champ seuil pour la conductivite non lineaire et dans la constante dielectrique statique. La relaxation dielectrique montre une distribution de temps de relaxation. L'amortissement du mouvement de l'ods depend aussi du desordre, et l'on decrit cette diffusion des excitations ods par les defauts. A basse temperature la conductivite non lineaire est decrite par un effet tunnel quantique. Le desordre augmente le champ caracteristique pour l'effet tunnel
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Atangana, José-Alain. "Evaluation des activités de recherche et développement et divulgation d'information dans le rapport annuel : le cas des entreprises côtées au SBF 250." Thesis, Clermont-Ferrand 1, 2012. http://www.theses.fr/2012CLF10391.
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Dans la littérature, plusieurs études et enquêtesont été menées dans le but d’identifier les besoinsinformationnels des investisseurs. Ces travauxconcluent à l’émergence d’informations de nature nonfinancière, relatives aux actifs immatériels détenus parles entreprises. Parmi ces actifs immatériels figurentles activités de R&D.A partir d’un échantillon d’entreprises quicomposaient l’indice SBF250 en 2005 et 2006, nousnous sommes posé la question de l’utilité desinformations non financières divulguées dans ledomaine de la R&D. En d’autres termes, est-Ce que ladivulgation de ces informations permet auxinvestisseurs d’évaluer les projets de R&D?Ce qui renvoi à l’étude d’associations entre cesinformations non financières et les valeurs de marché(prix et rendements des actions). Les résultats obtenusmontrent que les informations non financières sur laR&D sont associées négativement et de façonsignificative avec les valeurs de marchéAmong published writings, several studies and researches were carried out in order to determine the investors’ information needs. These works concluded to the emergence of non-Financial information relating to companies’ intangible assets. R&D activities are ones of those. Using the SBF250 index for years 2005 and 2006 as sample, we raised the question about the usefulness of non-Financial information disclosed within the framework of R&D. In other words, does communicating on this information enable investors to assess R&D projects?This question leads us to study the link (using the value relevance approach) between this nonfinancial information and market values (prices and returns). The results show that non-Financial information about R&D is unfavorably and meaningfully linked to market values
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Nguyen, Phu-Nhan, and n/a. "Smart Clients for small E-business framework." University of Canberra. Information Sciences & Engineering, 2005. http://erl.canberra.edu.au./public/adt-AUC20060803.104619.
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Businesses with less than 20 employees are regarded as small businesses. The four main
types of small business structures are mostly Sole Trader, Partnership, Trust, and
Company. E-commerce is the transformation of key commerce processes through the
use of the Internet. E-commerce consists of the buying, selling, marketing and servicing
of products and services over the Internet. The benefits of E-commerce are reduction in
costs, convenient communication and performance of the business process. Several
models for E-commerce are Business to Business (B2B), Business to Customer (B2C),
Business to Employee (B2E), Business to Government (B2G), and Customer to
Customer (C2C).
This thesis considers the small typical business structures in Australia to build a
framework for small business. Small Business Framework (SBF) is developed to
provide a framework to design and implement Web applications for Smart Clients and
applications for E-commerce and M-commerce models which are mainly B2B and B2C.
The SBF�s components are database, email, electronic payment, products, orders, and
login. The technology requirements to operate the SBF are Personal Digital Assistants
(PDA), Unicode, Web Server, Visual Studio .NET 2003 (VS .NET) and provision of
services through Internet. In order to test and evaluate SBF, an Online Asian Grocery
Mobile (OAGM) application has been developed for B2C using MS Visual Studio .NET
2003 (VS.NET). Results showed that the SBF is a good framework for small businesses
and the OAGM is a sucessful application prototype since OAGM provides good
accessibility, saves time, and is effective.
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Lee, Tsz Yan. "Evaluation of different bioceramics on their osteo-inductivity using 10T1/2 cells and the correlation of their effects with SBF study and in vivo bone formation /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?BIEN%202009%20LEE.
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Hubbard, Philip J. "Understanding biomineralization of polycaprolactone surfaces." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/119039/1/Philip_Hubbard_Thesis.pdf.
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This thesis explored both a method to fabricate new model systems of the gut using 3D printing (Universiteit Utrecht, UU), and the fundamental mechanisms behind a coating process used to improve the qualities of 3D-printed scaffolds for bone regeneration applications (Queensland University of Technology, QUT). More specifically, the projects involved using stereolithography (SLA) technology to produce a "midi-gut" representative of intestinal architecture for cell seeding at UU, and investigating and optimising calcium phosphate coating on polycaprolactone surfaces at QUT. This thesis corresponds to the dual Master in Biofabrication programme, carried out between UU (Utrecht, Netherlands) and QUT (Brisbane, Australia).
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Saci, Fateh. "La création de valeur des alliances stratégiques et fusions-acquisitions : justification comparative par le modèle de mesure de la valeur financière. Cas des sociétés du SBF 250." Thesis, Nice, 2013. http://www.theses.fr/2013NICE0041/document.
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Les alliances stratégiques et les fusions-acquisitions sont théoriquement considérées aujourd’hui comme de véritables leviers de création de valeur. Cette création de valeur prend différentes formes, à savoir essentiellement une valeur stratégique, une valeur substantielle, une valeur institutionnelle et une valeur financière (notamment actionnariale). C’est cette dernière qui retient spécifiquement notre attention. L’objectif de ce travail de recherche, après avoir analysé les résultats des travaux empiriques réalisés sur l’impact des annonces d’acquisitions portant sur la performance boursière, est de répondre à deux questions fondamentales. La première question est de savoir si à un horizon plus ou moins lointain, la performance boursière des acquisitions coïncide avec la performance réelle, et si par conséquent cette forme de croissance externe peut se justifier par la motivation financière des dirigeants ou actionnaires. La deuxième question est de savoir si cette hypothèse formulée se vérifie également pour le cas des alliances, établissant par la même une comparaison avantageuse en faveur de l’une ou l’autre des options de croissance externe. Nos résultats montrent en définitive que sur le court terme l’annonce d’une alliance a un impact négatif sur la performance contrairement à l’annonce d’une fusion ou d’acquisition, tandis que d’autre part sur le long terme, il n’y a aucun impact positif (impact neutre) sur la performance financière qu’il s’agisse de l’alliance stratégique ou de la fusion-acquisition. Nous expliquons ce résultat par un phénomène de « création de valeur compensatoire » dans le cadre d’une intention stratégico-financièreStrategic alliances and mergers & acquisitions are theoretically now considered as real levers of value creation. This value creation takes different forms, essentially strategic value, substantial value, institutional value and financial value (including shareholders). This latter holds our attention specifically. The objective of our research, after analyzing the results of empirical works focused on the acquisition announcements impact on the stock market performance, is to answer two fundamental questions. The first question is to know that if, on a more or less distant horizon, the stock market performance of acquisitions coincides with the actual performance and so if this form of acquisitions can be justified by the financial motivation of CEOs or shareholders. The second question is to know that if this hypothesis is also true in the case of alliances, establishing by the way an advantageous comparison in favor of one or other of the external growth options. Our final results show that in the short term the announcement of an alliance has a negative impact on performance as opposed to the announcement of a merger & acquisition, while other hand on the long-term, there is no positive impact (neutral impact) on financial performance whether it be the strategic alliance or merger & acquisition. We explain this result by the phenomenon of "creation of compensatory value" in the context of a strategic and financial plan
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Lou, Benqiang. "A geometric method of fatigue SCF and fracture SIF assessment." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=19543.
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In modern marine structural design, the fatigue life and fracture prediction of local connection details of the vessel is necessary. The traditional empirical rules or numerical work has considerably advanced the qualitative and quantitative understanding of fatigue and fracture analysis. Compared with the existing methods, this thesis explores a novel geometric methodology to evaluate the stress intensity and stress concentration factors (SIF and SCF). The background and special theory was developed to give: 1. A better understanding of the singularities that commonly occur in sharp corners in ship connection details; 2. A quicker method for fatigue life estimation than present methods based on finite element analysis and/or detail classes. 3. A prediction of the stress fields so that more appropriate and reliable finite element meshes can be selected When dealing with the influence of each connection detail, a "Length Scale" estimated from the dimensions of the connection detail. This Length Scale can be converted into a Hot Spot Stress Concentration Factor for SN based fatigue calculations or used with (often simply added to) the real crack length to determine, in conjunction with a constant Y value (commonly 1.1) a Stress Intensity Factor for linear elastic fracture mechanics crack growth calculations. The method is useful both for assessment of existing structures and for design application. The thesis includes a comparison of the results from the application of this new methodology and existing fatigue analysis guidance. Within the thesis the methodology is described together with relevant conclusions.
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Yayoglu, Yahya Efe. "Corrosion Characteristics of Magnesium under Varying Surface Roughness Conditions." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6606.
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The biggest challenge with magnesium alloy biodegradable implants is the rapid corrosion at the earlier stages of the healing process after implantation. In this research, the impact of surface roughness generated by different means on the corrosion rate of AZ31 magnesium alloy in a simulated biologic environment is investigated. In order to perform accurate experimentation, an in vitro setup is assembled that simulates the human body environment accurately has been prepared using Schinhammer’s in vitro immersion testing setup and Kokubo’s Simulated Body Fluid (SBF). For the immersion test of Mg in SBF, several surface texture groups of Mg have been prepared and submerged into the in vitro tank. The Mg samples’ comparative analysis has been made in terms of corrosion rate, total weight loss and hydrogen gas evolution within a span of 7 days for the first experiment to narrow down the scope and 14 days for the follow up experiment. After 14 days of in vitro immersion test with varying roughness and hydrophobic modifications such as Cytop coating and stearic acid modification, it has been observed that the roughness group created by etching in aqueous NaCl solution for three minutes, shows better corrosion resistance compared to the polished control group. Hydrophobic modifications on the surfaces did not affect the corrosion behavior significantly.
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N'Diaye, Karim. "Dynamique et topographie des réseaux neuronaux corticaux impliqués dans la perception du temps." Paris 6, 2006. http://www.theses.fr/2006PA066393.
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L'objectif de ce travail a été d'explorer les bases neurales de la perception du temps chez l'humain en analysant les corrélats électromagnétiques du jugement temporel par reconstruction des générateurs corticaux du signal de scalp électroencéphalographique et magnétoencéphalographique. Dans deux articles expérimentaux, nous montrons qu’indépendamment de la modalité sensorielle, un réseau étendu d'aires corticales est impliqué dans la discrimination de durées circaseconde et que le décours temporel de l'activité au sein de ce réseau s'accorde mal avec le mécanisme de pacemaker-accumulateur du modèle de temps scalaire. Nous proposons donc dans un article théorique, co-écrit avec Warren Meck, de montrer en quoi le modèle Striatal Beat Frequency offre un cadre biologiquement plus réaliste permettant de rapprocher les mécanismes à l'oeuvre dans la mémoire de travail et dans le traitement temporel.
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Vojtíšek, Jan. "Kompozitní keramické materiály na bázi hydroxyapatitu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376840.
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This work was focused on the study of hydroxyapatite based bioceramic materials. These materials are generally very important for medical purposes, especially in the reconstruction and replacement of bone material. For medical applications, inert, bioactive or bioresorbable materials can be used. One of the common "bioactive" materials is hydroxyapatite, which forms a large part of human bone. Hydroxyapatite can be prepared by a wide variety of procedures, one of the most common methods is the precipitation reaction used in this work. To improve the biocompatibility of the bone replacement, porous structures with adequate mechanical stability are used. For the initial study of simulation of the behavior of biomaterials in the human body, called in vitro tests are used in solutions based on synthetic body fluids or cell media. The experimental part deals with the synthesis of hydroxyapatite powder and CA phase composite compounds. The reactions between the individual components were studied by thermal analysis and heat microscopy. The resulting products were analyzed for phase composition by X-ray diffraction. The prepared powders were further processed on foam structures by in situ foaming and sintering at a suitable temperature. In vitro tests, following the behavior of the prepared porous products in the synthetic body fluid, were performed for 7, 14 and 28 days. The monitored composites were then studied for biocompatibility by scanning electron microscopy. At the same time, the change in the concentration of Ca2+ and PO43- ions in the body fluids tested was monitored.
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Minda, Jozef. "Elektrochemické charakteristiky hořčíkových slitin AZ31 a AZ61 v Hankových roztocích." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2015. http://www.nusl.cz/ntk/nusl-217106.
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This thesis deals with the characterization of electrochemical corrosion properties of magnesium alloys as promising materials for biomedical applications. The wrought alloys AZ31 and AZ61 were used and exposed to corrosive environments of Hanks solutions (SBF) to simulate environmental conditions in living organisms. For the evaluation of the surfaces was used scanning electron microscopy (SEM) with elemental analysis measured by energy-dispersive spectroscopy (EDS). Short-term (5 min) and long-term (72 h) corrosion tests were conducted in order to optimize the measurement methodology and obtain corrosion parameters - especially corrosion potential (Ekor), corrosion current density (ikor) and polarisation resistance (RP). To evaluation of the short-term tests were by potentiodynamic tests, namely the linear polarization (LP) test. Long-term tests were measured by electrochemical impedance spectroscopy (EIS). Effects of the composition of the alloys (AZ31 and AZ61), surface treatment (grinding and polishing) and the composition of the solution (SBF without Ca, Mg, and with Ca, Mg) were compared. Complex corrosion behaviour in time was characterized and corrosion mechanisms were discussed.
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García, González Rafael. "Etude du comportement sous déformation de copolymères à blocs SBS et SBM à morphologie lamellaire." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0045/these.pdf.
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Ce travail de recherche est consacré à la relation structure-propriétés des copolymères tri blocks du type SBS et SBM, où S est le polystyrène, B le polyibutadiè et M le poly(méthyl-méthacrylate). Ces matériaux appartiennent à la catégorie des matériaux "nano-structurés" lamellaires. Nous avons étudié les propriétés mécaniques en régime linéaire et en régime non linéaire des films copolymères orientés. Nous avons mis en évidence la corrélation de l'évolution de cette microstructure parfaitement définie avec la déformation, et ceux suivant l'orientation des sollicitations appliquées. Nos avons mis en oeuvre des techniques aussi complémentaires que la microscopie électronique en transmission et optique, le dichroïsme infrarouge, la diffusion aux petits angles des RX, l'analyse des courbes contrainte-déformation, les mesures en spectrométrie mécanique. Nous avons effectué des observations in situ. Les résultats les plus intéressants concernent la modification de la microstructure des systèmes orientés sous déformation observée in-situ à travers le dichroïsme infrarouge et la diffusion des rayons X aux petits angles. La première méthode nous a renseigné sur les changements structuraux induits par la déformation au niveau des conformations des chaînes, et la seconde nous a permis d'analyser les modifications structurales aux niveaux des domaines nanostructurés. De cette façon, nous rendons compte des évolutions de la texture et de la corrélation avec le comportement mécanique. Comme nous avons pu le constater, le comportement mécanique s'est avéré très différent selon l'orientation des lamelles par rapport à l'axe principal de la sollicitation (propriétés très fortement anisotropes)We have study the structure-properties relation of SBS and SBM black copolymers, where S is the polystyrene, B the polybutadiene and M the poly(methyl-methacrylate), These materials belong to the category of the lamellar "nana structured materials ". We studied the mechanical properties of oriented films in "linear" and in "non linear" conditions. We put in evidence the strain's effects in the microstructure evolution according to the orientation of the applied stress. We used some complementary experimental techniques as the transmission electronic microscopy and optic, the infrared dichroisme, the small angles X ray scattering, the analysis of the stress-strain curves, the measures of DMA. The most interesting results concern the modification of the oriented system's microstructure under strain observed in-situ through the infrared dichroisme and the X-rays scattering, the first shows the structural changes to the level of the chains conformations, and the second allowed us to analyze the structural modifications to the levels of the nanostructured domains. In this way we give account of the evolutions of the texture and the interrelationship with the mechanical behavior. As we could note the mechanical behavior proved to be very different according to the lamellae orientation in relation to the main axis of the solicitation
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García, González Rafael Séguéla Roland Cavaillé Jean-Yves. "Etude du comportement sous déformation de copolymères à blocs SBS et SBM à morphologie lamellaire." Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=garcia_gonzalez.
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Zheng, Wei. "Preparation and characterisation of tri-calcium phosphate scaffolds with tunnel-like macro-pores for bone tissue engineering." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46246/1/Wei_Zheng_Thesis.pdf.
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Calcium Phosphate ceramics have been widely used in tissue engineering due to their excellent biocompatibility and biodegradability. In the physiological environment, they are able to gradually degrade, absorbed and promote bone growth. Ultimately, they are capable of replacing damaged bone with new tissue. However, their low mechanical properties limit calcium phosphate ceramics in load-bearing applications. To obtain sufficient mechanical properties as well as high biocompatibility is one of the main focuses in biomaterials research. Therefore, the current project focuses on the preparation and characterization of porous tri-calcium phosphate (TCP) ceramic scaffolds. Hydroxapatite (HA) was used as the raw material, and normal calcium phosphate bioglass was added to adjust the ratio between calcium and phosphate. It was found that when 20% bioglass was added to HA and sintered at 1400oC for 3 hours, the TCP scaffold was obtained and this was confirmed by X-ray diffraction (XRD) analysis. Test results have shown that by applying this method, TCP scaffolds have significantly higher compressive strength (9.98MPa) than those made via TCP powder (<3MPa). Moreover, in order to further increase the compressive strength of TCP scaffolds, the samples were then coated with bioglass. For normal bioglass coated TCP scaffold, compressive strength was 16.69±0.5MPa; the compressive strength for single layer mesoporous bioglass coated scaffolds was 15.03±0.63MPa. In addition, this project has also concentrated on sizes and shapes effects; it was found that the cylinder scaffolds have more mechanical property than the club ones. In addition, this project performed cell culture within scaffold to assess biocompatibility. The cells were well distributed in the scaffold, and the cytotoxicity test was performed by 3-(4,5)-dimethylthiahiazo(-z-y1)-3,5-di- phenytetrazoliumromide (MTT) assay. The Alkaline Phosphatase (Alp) activity of human bone marrow mesenchymal stem cell system (hBMSCs) seeded on scaffold expressed higher in vitro than that in the positive control groups in osteogenic medium, which indicated that the scaffolds were both osteoconductive and osteoinductive, showing potential value in bone tissue engineering.
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Vallés, Lluch Ana. "P(EMA-co-HEA)/SiO2 hybrid nanocomposites for guided dentin tissue regeneration: structure, characterization and bioactivity." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/3795.
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Se sintetizaron nanocompuestos híbridos en bloque de poli(etil metacrilato-co-hidroxietil acrilato) 70/30 wt%/sílice, P(EMA-co-HEA)/SiO2, con distintas proporciones de sílice hasta el 30 wt%. El procedimiento de síntesis consistió en la copolimerización de los monómeros orgánicos durante la polimerización sol-gel simultánea de tetraetoxisilano, TEOS como precursor de sílice.
El TEOS se hidroliza eficientemente y condensa dando lugar a sílice, y presenta una distribución homogénea en forma de agregados inconexos de nanopartículas de sílice elementales en los híbridos con bajos contenidos de sílice (<10 wt%) o redes continuas interpenetradas con la red orgánica tras la coalescencia de los agregados de sílice (>10 wt%). La red polimérica orgánica se forma en los poros producidos en el interior de las nanopartículas elementales de sílice, y también en los poros formados entre los agregados de nanopartículas.
Los nanohíbridos con contenidos de sílice intermedios (10-20 wt%) exhibieron las propiedades más equilibradas e interesantes: i) refuerzo mecánico de la matriz orgánica conseguida gracias a redes de sílice continuas e interpenetradas, ii) buena capacidad de hinchado debida a la expansión de la red orgánica no impedida todavía por un esqueleto de sílice rígido, y a un número alto de grupos silanol terminales hidrófilos (concentraciones inorgánicas en los alrededores de la coalescencia), y iii) mayor reactividad superficial debido a un contenido relativo bastante elevado de grupos polares silanol terminales disponibles en las superficies.
La 'bioactividad' o capacidad de los materiales en bloque de formar hidroxiapatita (HAp) sobre sus superficies fue estudiada in vitro sumergiéndolos en fluido biológico simulado (simulated body fluid, SBF). La formación de la capa de HAp viene controlada por el mecanismo y el tiempo de inducción a la nucleación de la misma, que dependen a su vez de la estructura de la sílice.Vallés Lluch, A. (2008). P(EMA-co-HEA)/SiO2 hybrid nanocomposites for guided dentin tissue regeneration: structure, characterization and bioactivity [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/3795
Palancia
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Polúch, Eduard. "Návrh obchodní strategie SBU." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2013. http://www.nusl.cz/ntk/nusl-224164.
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The main subject of this thesis is creating a proposal of business strategy of SBU. The work includes theoretical knowledge related to the issue of the proposal of business strategy and strategic analysis of the current state of SBU. The outcomes of the thesis are the processing and evaulation of the real proposal of business strategy, which will be the basis for subsequent implementation.
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Šebesta, Petr. "Návrh strategie rozvoje SBU." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-221607.
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Bývalý americký prezident prohlásil: “Plány jsou nic, plánování je všechno”. V tomto duchu lze říci, že dobře fungující systém strategického řízení je svým způsobem důležitější než samotné dokumenty, které produkuje. V tomto duchu se nese i celá tato práce, která zachycuje určitý stav strategie jedné strategické obchodní jednotky (SBU) firmy GlobSol CZ a její posun kupředu od původních abstraktních cílů k naprosto jasným a konkrétním krokům, které bude třeba v budoucnosti udělat pro rozvoj této obchodní jednotky. Po zhodnocení současného stavu teorie, je provedena analýza současného stavu strategie obchodní jednotky vzhledem k jejím okolím. Ze závěrečné SWOT analýzy jsou pak pro jednotlivé její prvky určovány cíle směřující ke strategickému rozvoji. Každý cíl je rozvinut do jednoho, či více kroků, které jasně determinují jak a kdy lze daného cíle dosáhnout. Na závěr je zhodnocen přínos této obchodní strategie, její předpoklady a rizikové faktory. Nejcennějším na celém dokumentu je však samotná činnost tvorby strategie, která rozvíjí zcela nové pohledy na možnosti rozvoje strategické obchodní jednotky.
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Khaksari, Mohammadreza. "Analysis of Communication Architecture of GCDC 2011." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4797.
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This thesis report presents a method to analyze the communication architecture for the Intelligent Transportation Systems (ITS). The report also includes a case study on ASN.1 notation and analysis of its encoding rules. Included in the report is also: (i) accompanying instruction on how to use ASN.1 compilers to produce the C/C++ message encoder/decoder, and (ii) analysis of Non-IP communications of Communication Access for Land Mobiles (CALM-FAST) protocol stack in ITS. The thesis is a part of the research project entitled “SCOOP”, a joint project between SCANIA CV AB and KTH. The purpose of this thesis is to contribute to the ultimate goal, which is to equip a vehicle with necessary hardware and software technology to provide a platooning behavior in the GCDC 2011 competition. This goal is achieved by the means of wireless communication system for both vehicle to vehicle and vehicle to road side units communications in the platoon. Overall, this thesis introduces the important usage of ASN.1 in implementation of cut-edge telecommunication systems especially in V2V and V2I communication; and clarifies the CALM-FAST protocol stack in mobile nodes.Kartlägga CALM-FAST protokollet och hur det användes tillsammans med den i tävlingen GCDC 2011 fastslanga kommunikationsprotokollet. GCDC var ett tävling i kooperativ körning arrangerad och initierad av Hollänska TNO och gick ut på att få fordon att agera tillsammans beserat på information sänt via WLAN 802.11p. ASN.1 användes och ingick i analysen.
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Karshovska, Ela. "Molekulare Regulation der SDF-1a-Expression [SDF-1-alpha-Expression] bei der Neointimabildung." kostenfrei, 2009. http://d-nb.info/1001124804/34.
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Alvarez, Cabrera Tanya. "SBW Feedback : Design of feedback system for increased usability in monostable SBW shifters." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62445.
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Electromechanical shift-by-wire car transmission systems make way for new innovative shifter designs such as monostable shifters that spring back to a starting position after a gear has been chosen. Unfortunately the radical change in the communication between the user and shifter has resulted in accidents due to incorrect gear selection. The inadequate usability of the monostable shifters can be attributed to the feedback it provided to users. The aim of the thesis project was to develop a feedback concept that would improve the usability of a monostable shifter and to study if auditory feedback could be introduced to vehicle systems. By implementing design theory, benchmarking and various creativity methods five concepts with feedbacks in different modalities were developed. The concepts were evaluated in a usability study that involved 25 test participants. A review of the observations from the usability study along with an analysis of the interviews and collected data resulted in the final VRA concept. VRA was a multimodal concept with permanent visual feedback and optional auditory feedback. The shifting pattern was shown on the instrument cluster where the active gear was highlighted through light intensity, color and shape contrasts. The solid blue block, within which the abbreviation for the active gear was displayed, could be seen in the peripheral view. It was perceived as calm and helped the users navigate the shifter. A female machine voice that had a Swedish pronunciation was chosen as the auditory feedback to accompany the “P”, “R” and “D” gear selections. None of the users were indifferent towards the auditory feedback, some perceived it as caring while others found it annoying. Since the analysis did not indicate that auditory feedback was crucial, the VRA concept included an option to turn on or off the sound. Monostable shifters behave differently compared to traditional polystable shifters, therefore with the changes in the physical movement the communication must also be reviewed. It is recommended to include the shifting pattern on the instrument cluster together with monostable shifters, as it makes up for the loss of the visual and haptic information from the physical shifter. Although the usability study showed that auditory feedback was not necessary, improvements were observed among people who favored it. The auditory information would most likely be better received if earcons were implemented instead of speech.Elektromekaniska shift-by-wire växlingssystem tillåter nya innovativa designlösningar så som monostabila växelväljare som fjädrar tillbaka till en ursprungsposition efter varje växelval. Dessvärre har den drastiska förändringen i kommunikationen mellan användarna och systemet resulterat i missförstånd och olyckor till följd av fel växelval. Den bristfälliga användbarheten av monostabila växelväljare kan härledas till feedbacken mellan förarens handling och resultat. Syftet med examensarbetet var att utveckla feedbackkoncept som förbättrade användbarheten av en monostabil växelväljare samt att studera om auditiv feedback kunde introduceras i förarsystem. Genom att implementera kunskaperna inom designteori, observationer från benchmarking samt diverse kreativa metoder kunde fem olika koncept presenteras. Koncepten utvärderades i en användbarhetsstudie med 25 testdeltagare. En genomgång av observationerna från användbarhetsstudien, intervjusvaren samt dataanalysen resulterade i det slutgiltiga konceptet VRA. VRA var ett multimodalt koncept som innehöll permanent visuell feedback samt valbar auditiv feedback. Växlingsschemat visades på instrumentpanelen där den aktiva växeln markerades med hjälp av kontraster i ljusintensitet, färg och form. Förkortningarna på aktiva växel visades inuti en solid blå rektangel som var synlig i periferin. Färgen uppfattades som lugn och den starka kontrasten hjälpte personerna att navigera växelväljaren. Den auditiva feedbacken var i form av en kvinnlig maskinröst med svenskt uttal som kompletterade ”P”, ”R” och ”D” växellägena. Inga testpersoner var likgiltiga till auditiv information, vissa beskrev den som omtänksam medan andra ansåg att den var irriterande. Eftersom analysen indikerade att auditiv feedback inte var kritisk var den auditiva feedbacken valbar i VRA. Monostabila växelväljare skiljer sig drastiskt från polystabila, därför bör kommunikationen mellan systemet och människan ses över i och med de fysiska förändringarna. Växlingsschemat bör inkluderas i instrumentpanelen i samband med att monostabila växelväljare används. Det kan nämligen kompensera bristen på den visuella och haptiska feedbacken från den fysiska väljaren. Trots att analysen visade på att auditiv feedbak inte var nödvändig kunde förbättringar observeras bland personer som tyckte om det. Den auditiva informationen skulle mest troligt få ett bättre bemötande om earcons användes istället för tal.
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Serrano, Carmen Luisa Reis. "Uso de resíduo de SBR proveniente da indústria de calçados em composições de SBR." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/18586.
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Este trabalho foi realizado para o desenvolvimento e caracterização de compostos à base do copolímero aleatório de poli (estireno-co-butadieno) – SBR, contendo resíduo do próprio polímero oriundo de aparas de solados da indústria calçadista. Foi estudada a influência da incorporação de diferentes concentrações do resíduo SBR nas propriedades mecânicas e térmicas dos compostos de SBR para solados. As propriedades mecânicas e térmicas destas composições foram comparadas a formulações contendo diferentes concentrações de sílica. Os resultados mostraram que aumentando o teor de resíduo de SBR na formulação ocorre um aumento na viscosidade, devido à estrutura já reticulada do resíduo. Foi verificado que o aumento no tamanho de partícula do resíduo de SBR incorporado acentuou esta tendência. A redução do número de ligações cruzadas nas misturas pela elevação do teor de resíduo SBR reduz o índice de inchamento e provoca a diminuição nas propriedades mecânicas de tensão à ruptura, alongamento e resistências à abrasão, rasgamento e à flexão. Já a elevação na dureza, densidade e resistência à descolagem, se devem à redução na mobilidade entre as cadeias poliméricas provocado pelo acréscimo do resíduo SBR, que contém estrutura super segmentada, oriunda das reticulações existentes, o que diminui a flexibilidade da matriz polimérica onde for incorporado. Pelo uso da metodologia estatística de análise de variância (ANOVA) os resultados das propriedades mecânicas de tensão à ruptura, alongamento e resistências ao rasgamento foram validados para além da amostra analisada. Já pela análise de regressão linear foi possível afirmar que as concentrações de sílica e de resíduo SBR têm efeito sobre as propriedades mecânicas e esta relação pode ser expressa através de modelos de comportamento, que podem ser representados graficamente. Também é possível prever um modelo de comportamento mecânico incluindo concentrações intermediárias não medidas experimentalmente dentro dos limites observados da amostra.In this study the development and characterization of compounds based on the random styrene-butadiene copolymer poly (styrene-co-butadiene) rubber (SBR), containing residue of the polymer itself originating from sole scraps of the shoe industry, was carried out. The influence of the incorporation of different concentrations of SBR residue on the mechanical and thermal properties of SBR for sole compounds was studied. The mechanical and thermal properties of these compositions were compared with formulations containing different silica concentrations. The results showed that increasing the SBR residue content in the formulation led to an increase in viscosity, due to the already cross-linked structure of the residue. It was verified that the increase in the particle size of the SBR residue incorporated enhanced this tendency. The reduction in the number of cross-links in the mixtures with an increase in the SBR residue content reduces the swelling index and causes a decrease in the mechanical properties of stress rupture, elongation, and abrasion, tearing and flexion resistances. The increases in hardness, density and resistance to debonding are due to the reduction in mobility between the polymer chains caused by the increase in SBR residue, which contains a super segmented structure, originating from the existing cross-links, which decreases the flexibility of the polymer matrix wherever it is incorporated. Through the use of the statistical methodology analysis of variance (ANOVA) the results for the mechanical properties of stress rupture, elongation and tearing resistance were validated beyond the sample analyzed. It was possible to affirm through the linear regression analysis that the silica and SBR residue concentrations have an effect on the mechanical properties and this relation can be expressed through behavior models, which can be represented graphically. It is also possible to predict a mechanical behavior model including intermediate concentrations not experimentally measured within the observed limits of the sample.
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Andersson, Maria, and Ulrika Karlsson. "SKF Göteborg det självklara valet?" Thesis, University West, Department of Studies of Work, Economics and Health, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-435.
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Montaño, Sonia. "A TV jogo no SBT." Universidade do Vale do Rio do Sinos, 2007. http://www.repositorio.jesuita.org.br/handle/UNISINOS/2619.
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Previous issue date: 9Fundação Universitária para Desenvolvimento do Ensino e da Pesquisa
A pesquisa relatada nas páginas desta dissertação de mestrado problematiza o jogo televisivo (programas de jogo e jogos fora dos programas) no Sistema Brasileiro de Televisão (SBT) como enunciação da mídia TV. A dissertação, inserida na linha de pesquisa Mídias e Processos Audiovisuais, do Programa de Pós-graduação em Comunicação da UNISINOS, partiu da intuição de uma TV jogo na emissora, em relação à qual o projeto colocava os seguintes problemas de pesquisa: 1) Identificar os sentidos dados pela emissora ao jogo em mundos televisivos construídos a partir do jogo; 2) Estabelecer relações entre o jogo nos imaginários da emissora e em outros imaginários (na cultura brasileira, nas ciências humanas, nas ciências exatas); 3) Analisar o lúdico no SBT na perspectiva do jogo, perspectiva que é ao mesmo tempo contrariada, enunciativamente, por parte da emissora, justamente pelo abundante comparecimento de jogos nos seus panoramas televisivos. As opções metodológicas feitas estão relacionadas ao método intuitivo de B
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Rice, Michael, and Qiang Lei. "SHF MULTIPATH CHANNEL MODELING RESULTS." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604799.
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ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, NevadaThis paper presents the results of land-based SHF channel modeling experiments. Channel modeling data were collected at Edwards AFB, California at S-Band, X-Band and Ku-band. Frequency domain analysis techniques were used to evaluate candidate channel models. A graphical user interface (GUI) was developed to search for the optimum channel parameters. The model parameters corresponding to different frequencies were compared for multipath events captured at approximately the same locations. A general trend was observed where the magnitude of the first multipath reflection decreased as frequency increased and the delay remained relatively unchanged.
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Czardybon, Margarete. "Charakterisierung der Genexpression des neuen Chemokines SDF-1[gamma] [SDF-1gamma] im Nervensystem der Ratte." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966046552.
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