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Dissertations / Theses on the topic 'Stiffness factor'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Ross, Edward R. S. "Stiffness : a key mechanical factor in normal, degenerate and artificial lumbar intervertebral discs." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3213.

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This thesis describes the development of artificial disc technology for the replacement of intervertebral discs in the human lumbar spine. The clinical problem is back pain. There may be a relationship between certain forms of back pain and disc degeneration. The mechanical properties of human intervertebral discs are examined in detail. The genetic basis of disc degeneration is presented. The hypothesis is that such degeneration leads to a loss of normal stiffness in the segments affected leading to abnormal mechanical behaviour which in turn leads to pain. The evidence for this is presented.

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2

Quinlan, Angela. "Mechanical Activation Of Valvular Interstitial Cell Phenotype." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/355.

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"During heart valve remodeling, and in many disease states, valvular interstitial cells (VICs) shift to an activated myofibroblast phenotype which is characterized by enhanced synthetic and contractile activity. Pronounced alpha smooth muscle actin (alpha-SMA)-containing stress fibers, the hallmark of activated myofibroblasts, are also observed when VICs are placed under tension due to altered mechanical loading in vivo or during in vitro culture on stiff substrates or under high mechanical loads and in the presence of transforming growth factor-beta 1 (TGF-beta 1). The work presented herein d

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3

Camós, Llovet Lourdes. "Factors associated with arterial stiffness in a general Mediterranean population and in a Mediterranean intermediate cardiovascular risk population." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/666817.

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The objectives of the thesis are to estimate the prevalence of pathological arterial stiffness (measured with the Cardio-Ankle Vascular Index –CAVI-) in a general Mediterranean population and in a Mediterranean intermediate cardiovascular risk population, and to assess the association of this condition with lifestyle, cardiovascular risk factors, and socioeconomic status. The prevalence of pathological CAVI was high, mainly in the intermediate cardiovascular risk population. Pathological CAVI was associated with hypertension and diabetes, and negatively associated with obesity in both popul

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4

Mahan, Amir. "Dynamic Response of a Tied Arch Bridge to a Choice of Loading & Operation Conditions : A case study of the Urmia Lake Bridge." Thesis, KTH, Bro- och stålbyggnad, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36791.

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5

Lekesiz, Huseyin. "Stress Intensity Factors and Effective Spring Stiffness for Interfaces with Two and Three Dimensional Cracks at the Interface between Two Dissimilar Materials." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293574318.

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6

Perez-Barbante, Dezire Q'anna. "IN-PLANE CYCLIC SHEAR PERFORMANCE OF PIPE STEM REINFORCED COB WALL." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2116.

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This thesis investigates full-scale pipe stem reinforced cob walls under in-plane cyclic shear loads. Cob is the combination of clay subsoils, sand, straw and water that is built in lifts to produce monolithic walls. There is insufficient amount of information on cob as a building material in today’s age. The prior research that exists has examined varying straw content and type, water content, and mixture ratios to determine their effect on strength. There is currently one report that analyzes full-scale cob walls under in-plane loading. This thesis looks to iterate the full-scale tests and s

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7

Nation, Cory A. "The "45 Degree Rule" and its Impact on Strength and Stiffness of a Shaft Subjected to a Torsional Load." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1417442309.

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8

Smagina, Zana. "Dynamic amplification for moving vehicle loads on buried pipes : Evaluation of field-tests." Thesis, KTH, Bro- och stålbyggnad, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36801.

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9

Brabenec, Ladislav. "Topologicko-geometrický návrh a deformačně-napjatostní analýza tvaru disku železničního kola pro různé provozní podmínky na základě analýz LELM." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229933.

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The thesis deals with the behaviour of a cracked rail wheel. The aim was to perform the strain analysis of intact wheel as well as the fracture analysis of the primary direct cracked wheel. Solution includes an analysis of operating conditions, assessment of the substantiality of articular components of load, stiffness of the wheel, a comprehensive analysis of fracture of the selected railway wheel profile and optimization of the wheel shape depending on the matching fracture properties.

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10

Santagata, Maria Caterina. "Factors affecting the initial stiffness and stiffness degradation of cohesive soils." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9663.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 1999.<br>"December, 1998."<br>Includes bibliographical references.<br>This research investigated the pre-failure stress-strain behavior of cohesive soils through an ex.tensive testing program conducted on Resedimented Boston Blue Clay (RBBC). The uniformity and reproducibility in the behavior of this soil permitted a detailed study of the role of the following factors on both initial stiffness and small strain (Ea<O.1%) non-linearity in undrained triaxial compression: consolidation str

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11

Hjalmarsson, Joel, and Anes Memic. "FE Analysis of axial-bearing in large fans : FE analys av axialkullager i stora fläktar." Thesis, Linnaeus University, School of Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6663.

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<p>Detta examensarbete har utförts på Fläktwoods AB i Växjö, som producerar stora axialfläktar för olika industriapplikationer. Syftet är att öka kunskapen om fettsmorda axiella kullager genom FE analyser.</p><p>Projektet har genomförts i fem delsteg för att avgöra påverkan av en eller några få parametrar i taget. De studerade parametrarna är: elementstorlek, kontaktstyvhet, last, lagergeometri (dvs. oskulation), ickelinjär geometri och ickelinjära materialegenskaper (dvs. plasticitet).</p><p>Slutsatsen är att elementstorleken bör väljas fint nog för att ge ett jämnt resultat men grovt nog för

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12

Ng, Wei Loong. "Stiffness factors in material efficiency for automotive application." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-07132001-115739.

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13

Soveri, Inga. "Renal Dysfunction and Cardiovascular Disease." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6941.

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14

Rorke, Letisha. "Some factors affecting the cyclic stiffness of railway formation material." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/397362/.

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Engineered pavements are a key part of the transport asset that includes flexible road pavements, railway formations and airport runways. Their design, construction and maintenance need to be economically and environmentally optimised, while meeting serviceability criteria over the design life of the pavement. The main serviceability criteria used for railway track design are the permanent deformation and track stiffness. Subgrade stiffness influences the design depth of ballast and compacted formation layers are used to improve stiffness and reduce stresses induced in the natural subgrade. Th

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15

Bakrim, Hassan. "Étude des transitions de Peierls dans les systèmes unidimensionnels et quasi-unidimensionnels." Thèse, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/5140.

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We studied the structural instabilities of one-dimensional (1D) and quasi-one-dimensional (Q1D) electron-phonon systems at low temperature through two models, SuSchrieffer-Heeger (SSH) and molecular crystal (CM) with and without spin. The phase diagrams are obtained using a Kadanoff-Wilson renormalization group approach (GR). For the 1D half-filled system the study of the frequency dependence of the electronic gap allowed us to connect continuously the two limits, adiabatic and non-adiabatic. The Peierls and Cooper channels interference and the quantum fluctuations reduce the gap. A regime cha

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16

Baker, Matthew W. "Effect of Pallet Deckboard Stiffness and Unit Load Factors on Corrugated Box Compression Strength." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79367.

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Corrugated paper boxes are the predominant packaging and shipping material and account for the majority of packaging refuse by weight. Wooden pallets are equally predominant in shipping, transportation and warehousing logistics. The interaction between these two components is complex and unexplored leaving industry to compensate with outdated component specific safety factors. Providing a focused exploration of the box and pallet interaction will open the door for holistic design practices that will reduce cost, weight, damage, and safety incidents. This study was separated into four chapters

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17

Waterworth, Sally. "Hamstring flexibility : measurement, stretching and injury susceptibility." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40275.

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ix Flexibility has traditionally been considered an important component of human physical fitness but this conjecture lacks supporting empirical evidence. While there is extensive published research examining the relative importance of flexibility and the impact of various methods of stretching on levels of flexibility, performance and injury risk, the quality of studies has varied considerably, reliability and validity of methodology has not always been proven, and rationale has at times been questionable. Additionally, much literature has focused on static flexibility which is not necessari

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18

Cheung, Yiu-fai, and 張耀輝. "An analysis of the determinants of peripheral conduit arterial stiffness in children and teenagers in health and disease." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29761815.

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19

Gago, Paulo. "Post activation potentiation : Modulating factors and mechanisms for muscle performance." Doctoral thesis, Gymnastik- och idrottshögskolan, GIH, Laboratoriet för biomekanik och motorisk kontroll (BMC), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-4280.

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Introduction: Acute enhancements of muscle contractile properties and performance subsequent to a maximal or near maximal conditioning contraction are often termed post activation potentiation (PAP). Although still controversial, PAP is commonly linked to enhancements in the myosin regulatory light chain phosphorylation, leading to improvements in the excitation–contraction coupling. The PAP seen after a conditioning task often coexists with fatigue and is known to depend on strength level, muscle fiber type and age. Less is known about how factors such as static and dynamic changes in muscle

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20

Susila, Gede Adi. "Experimental and numerical studies of masonry wall panels and timber frames of low-rise structures under seismic loadings in Indonesia." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/experimental-and-numerical-studies-of-masonry-wall-panels-and-timber-frames-of-lowrise-structures-under-seismic-loadings-in-indonesia(3ceb094b-4e6e-432a-b3de-3d4c306b0551).html.

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Indonesia is a developing country that suffers from earthquakes and windstorms and where at least 60% of houses are non-engineered structures, built by unskilled workers using masonry and timber. The non-engineered housing units developed in urban region are also vulnerable to seismic hazard due to the use of low quality of material and constructions method. Those structures are not resistant to extreme lateral loads or ground movement and their failure during an earthquake or storm can lead to significant loss of life. This thesis is concerned with the structural performance of Indonesian low

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21

Axelsson, Therese. "An assessment of patients followed for Hepatitis B at the Department of Infectious Diseases at Örebro University Hospital : - Factors associated with significant liver fibrosis evaluated by transient elastography." Thesis, Örebro universitet, Institutionen för medicinska vetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-76215.

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Introduction: Chronic hepatitis B (CHB) is a viral infection that can lead to development of fibrosis and hepatocellular carcinoma (HCC). Several factors affecting disease progression have been reported, such as sex and region of origin. Liver stiffness and fibrosis can be evaluated using transient elastography. The degree of fibrosis is an important parameter when deciding if treatment and HCC surveillance is indicated. Aim1) To compare patients with CHB according to sex and region of origin regarding the parameters liver stiffness, presence of significant fibrosis, hepatitis B e antigen (HBe

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22

Almalag, Haya. "Methotrexate and cardiovascular risk factors with a focus on arterial stiffness and blood pressure in patients with rheumatoid arthritis in Saudi Arabia : cross sectional and longitudinal analysis." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228050.

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Background: Rheumatoid arthritis (RA) is an inflammatory disease associated with an increased risk of cardiovascular morbidity and mortality. Methotrexate is a widely used RA medication that has encouraging results for being protective from RA cardiovascular related complications. In a published meta-analysis, MTX showed a 21% reduction in cardiovascular mortality; however, this meta-analysis had multiple limitations. Arterial stiffness is considered to be one of RA's extra-articular manifestations. As a common medication, could MTX have a beneficial effect on traditional cardiovascular risk f

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23

Al, Hosani Mohamed. "Transient and Distributed Algorithms to Improve Islanding Detection Capability of Inverter Based Distributed Generation." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6235.

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Recently, a lot of research work has been dedicated toward enhancing performance, reliability and integrity of distributed energy resources that are integrated into distribution networks. The problem of islanding detection and islanding prevention (i.e. anti-islanding) has stimulated a lot of research due to its role in severely compromising the safety of working personnel and resulting in equipment damages. Various Islanding Detection Methods (IDMs) have been developed within the last ten years in anticipation of the tremendous increase in the penetration of Distributed Generation (DG) in dis

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24

Chau, Kénora. "Dysfonction diastolique, rigidité artérielle aortique et hypertension : facteurs anthropométriques et métaboliques associés et prise en charge en population générale." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0281/document.

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L’augmentation de l’obésité durant les dernières décennies expose la population à un risque accru de problèmes métaboliques et des maladies cardiovasculaires. Ce travail étudiait, d’une part, l’association de l’obésité avec la dysfonction diastolique et la rigidité artérielle aortique vingt ans plus tard chez des adultes initialement en bonne santé. Cette étude montrait que l’obésité générale mesurée par l’indice de masse corporelle et l’adiposité abdominale mesurée par le tour de taille étaient associées positivement à la dysfonction diastolique. Mais elles semblaient jouer un rôle protecteur

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Rodrigues, Sara. "Avaliação da rigidez arterial e da resistência vascular periférica em pacientes recém-diagnosticados com síndrome metabólica." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/5/5160/tde-24102016-115125/.

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Além das alterações autonômicas, a síndrome metabólica (SMet) causa disfunção vascular relacionada a eventos cardiovasculares e morte. Considerando que a resistência à insulina é associada à hiperativação simpática, testamos a hipótese de que a presença da glicemia de jejum alterada (GLI) é a principal causa das alterações estruturais e funcionais em grandes e pequenos vasos, via aumento do tônus simpático nesses pacientes. Foram avaliados pacientes com SMet recém diagnosticados (ATP-III) e não medicados, divididos em: glicemia de jejum alterada >=100mg/dL (SMet+GLI, n=35; 50±1 anos) e glicemi

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26

Harbaoui, Brahim. "Rigidité Vasculaire en cardiologie interventionnelle." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1265/document.

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Le vieillissement vasculaire est un phénomène inéluctable. Il s'accompagne de modifications structurelles et fonctionnelles du système cardio-vasculaire constituant la rigidité vasculaire. Ce processus dégénératif affecte essentiellement la matrice extra cellulaire des artères élastiques. La perte de l'élasticité du système vasculaire va impacter la fonction ventriculaire gauche et la perfusion cardiaque, rénale et cérébrale par des mécanismes différents. La rigidité vasculaire est un puissant marqueur de risque cardio-vasculaire. Cette notion est peu répandue dans le domaine de la cardiologie

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Lewandowski, Adam J. "The impact of preterm birth on the cardiovascular system in young adulthood." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:f39dbabd-9f4f-439e-9c25-1989402a263a.

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Advancements in clinical care have led to a growing cohort of preterm-born individuals now entering adulthood. Before birth, such adults were often exposed to a suboptimal intrauterine environment, and after delivery, key developmental stages that would normally occur in utero during the third trimester had to take place under ex utero physiological conditions. Through detailed cardiovascular phenotyping, this thesis investigates the cardiovascular changes in preterm-born young adults, utilising a cohort of individuals with data collection since recruitment at birth. The detailed perinatal inf

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28

Kužet, Sanya-Eduarda. "Étude du rôle de la rigidité matricielle dans la résistance des cellules de carcinomes squameux aux thérapies anti-cancéreuses." Electronic Thesis or Diss., Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4010.

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Dans notre modèle de carcinome épidermoïde humain de la tête et du cou (HNSCC), si l’on observe une surexpression du récepteur au facteur de croissance épidermique (EGFR) dans plus de 15 % des cas, les cellules cancéreuses (SCC) sont réfractaires à un traitement par des inhibiteurs de l’activité Tyrosine kinase de l’EGFR (EGFR TKI) tels que le Géfitinib et l’AG1478. A ce jour, les mécanismes moléculaires et cellulaires impliqués dans la résistance des HNSCC aux EGFR TKI sont encore inconnus. On sait aujourd’hui que les niches tumorales jouent un rôle crucial dans la résistance des cellules can

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29

Fenollosa, Artés Felip. "Contribució a l'estudi de la impressió 3D per a la fabricació de models per facilitar l'assaig d'operacions quirúrgiques de tumors." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667421.

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La present tesi doctoral s’ha centrat en el repte d’aconseguir, mitjançant Fabricació Additiva (FA), models per a assaig quirúrgic, sota la premissa que els equips per fer-los haurien de ser accessibles a l’àmbit hospitalari. L’objectiu és facilitar l’extensió de l’ús dels prototips com a eina de preparació d’operacions quirúrgiques, transformant la pràctica mèdica actual de la mateixa manera que en el seu moment ho van fer tecnologies com les que van facilitar l’ús de radiografies. El motiu d’utilitzar FA, en lloc de tecnologies més tradicionals, és la seva capacitat de materialitzar de forma

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30

Wang, Weihua active 2013. "A study of stiffness of steel bridge cross frames." 2013. http://hdl.handle.net/2152/21218.

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Cross frames are critical components in steel bridge systems. Cross frames brace girders against lateral torsional buckling and assist in distributing live loads to girders during the service life of the bridge. In curved bridges, cross frames also serve as primary structural members in resisting torsion generated by the traffic loads. The conventional cross frames are often constructed in X- or K- type shapes with steel angle sections. However, the actual stiffness of these cross frames are not well understood or quantified, leading to potentially inaccurate prediction of bridge behavior an

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31

Chang, Chao-Chi, and 張兆琦. "The Strength Reduction Factor for structures with trilinear Added Damping and Stiffness Device." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82451500340276796716.

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碩士<br>國立中央大學<br>土木工程學系<br>86<br>In this study, assuming the load-displacement relation of both frame and TADAS device to be bilinear, a trilinear load- displacement relation is constructed to compute the strength- reduction factor for a frame installed with a TADAS and the capability of TADAS in dissipating earthquake energy. In order to compare with the expression for the design earthquake force adopted in Taiwan, the strength reduction factor is expressed as the product of 、 and which

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32

Derricks, Kelsey Elena. "Individual and population based VEGF-endothelial cell processing is modulated by extracellular matrix stiffness." Thesis, 2015. https://hdl.handle.net/2144/13727.

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Vascular endothelial growth factor (VEGF) is required for the development, growth and survival of blood vessels. Endothelial cell behavior is altered by cell substrate stiffness, suggesting that VEGF activity might also be influenced by cell-substrate mechanics. We studied VEGF binding, internalization, and signaling as a function of substrate stiffness using endothelial cells cultured on fibronectin (fn) linked polyacrylamide gels. Individual cell analysis of VEGF-induced calcium fluxes in endothelial cells on various stiffness extracellular matrices (ECM) revealed heterogeneity in our ce

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YANG, YAN-ZONG, and 楊衍宗. "A study on the stress concentration factor and meshing stiffness for standard and profile shifted involute teeth." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/82034789789498709825.

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34

Chirathadam, Thomas. "Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics." Thesis, 2012. http://hdl.handle.net/1969.1/148301.

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Gas bearings in oil-free micro-turbomachinery for process gas applications and for power generation (< 400 kW) must offer adequate load capacity and thermal stability, reliable rotordynamic performance at high speeds and temperatures, low power losses and minimal maintenance costs. The metal mesh foil bearing (MMFB) is a promising foil bearing technology offering inexpensive manufacturing cost, large inherent material energy dissipation mechanism, and custom-tailored stiffness and damping properties. This dissertation presents predictions and measurements of the dynamic forced performance of v

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Liu, Yuxin. "Progressive-Failure Analysis of Steel Building Structures under Abnormal Loads." Thesis, 2007. http://hdl.handle.net/10012/2759.

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Engineered structures are designed to resist all expected loadings without failure. However, structural failures do occasionally occur due to inadequate design and construction, especially for extreme and abnormal loads. This thesis concerns the progressive collapse of structures due to abnormal loading events, and develops a method of advanced analysis for predicting the progressive collapse behaviour of building structures in the plastic limit state. Combined-stress failure states and stiffness degradation models are proposed to simulate plastic deformation of structural members. Elliptic f

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Yu, Yu-Min, and 游裕民. "Effect of Effective Length Factors of Tapered Columns due to Relative Joint Bending Stiffness Ratio." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/05153289603494225235.

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碩士<br>朝陽科技大學<br>營建工程系碩士班<br>90<br>Alignment Chart is commonly used to determine the effective length factor of prismatic member. Due to the restriction of the application of Alignment Charts, designers often discard the application of tapered members. To follow up the developing of a modified stiffness matrix method and a computer program with a very high generality to solve steel structural stability problem, the analytical method used in this study are Discrete Element Model and incremental typed numerical method. For more practical, this study simplifies the model to modify tapered frames.

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Chen, Yu-Lin, and 陳育麟. "Comparison of arterial stiffness, vagosympathetic activity and risk factors in subjects with exercise hypertension and normotension." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/42855745824753640969.

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碩士<br>國立陽明大學<br>物理治療學系暨研究所<br>94<br>Background and purpose : Hypertension is a prevalent worldwide problem. Besides the major risk factors, arterial stiffness and autonomic nervous system (ANS) dysfunction have also important roles on the pathophysiology of hypertension. Exercise hypertension, an exaggerated rising of blood pressure (BP) during physical activity, has been found to be a strong predictor of cardiovascular mortality and may be an early marker of essential hypertension. However, the exact mechanism of exercise hypertension is unclear. The purpose of this study was to compare the d

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Ahsan, Shoeb. "Investigation of Adult Retinal Precursor Cell Behaviour In Response To Soluble Factors And Varying Substrate Stiffness in Two and Three Dimensional Scaffolds." Thesis, 2010. http://hdl.handle.net/1807/25398.

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We have studied the factors that are important for producing functional retinal neurons from adult derived retinal stem and progenitor cells (RPCs) investigating the role of substrate stiffness or soluble factors in 2D and 3D culture on the differentiation and survival of RPCs. RPCs were cultured on agarose scaffolds modified with the adhesive peptides of varying stiffness. We observed that cell survival in the 0.75% matrix was greater in 3D than in 2D by a factor of 50% irrespective of the time in culture. We observed the presence of photoreceptors exclusively in 0.75% agarose, while the stif

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Lübbe, Jannis Ralph Ulrich. "Cantilever properties and noise figures in high-resolution non-contact atomic force microscopy." Doctoral thesis, 2013. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2013040310741.

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Different methods for the determination of cantilever properties in non-contact atomic force microscopy (NC-AFM) are under investigation. A key aspect is the determination of the cantilever stiffness being essential for a quantitative NC-AFM data analysis including the extraction of the tip-surface interaction force and potential. Furthermore, a systematic analysis of the displacement noise in the cantilever oscillation detection is performed with a special focus on the thermally excited cantilever oscillation. The propagation from displacement noise to frequency shift noise is studied under c

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Castanheira, Pedro Xavier Melo Fernandes. "The use of subclinical vascular markers of atherosclerosis in youth." Doctoral thesis, 2015. http://hdl.handle.net/10400.5/12066.

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The foundations for cardiovascular disease (CVD) in adults are laid in childhood and accelerated by the presence of comorbid conditions. Early detection of manifestations of cardiovascular pathology is an important clinical objective to identify those at risk for subsequent cardiovascular morbidity and events, and to initiate behavioral and medical interventions to reduce risk. Children were once considered to be at low risk, but with the growing health concerns related to lifestyle, cardiovascular screening may be needed earlier. Several noninvasive procedures are available to assess the cumu

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