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Dissertations / Theses on the topic 'Viscoelastic parameters of hair'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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1

Jinks, Ian Robert. "The viscoelastic properties of chemically modified α-keratins in human hair". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/the-viscoelastic-properties-of-chemically-modified-alphakeratins-in-human-hair(6ad4b354-3a84-4113-be87-a71952ae2caa).html.

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Human hair, like other α-keratinous fibres, is a highly complex biomaterial. For the analysis of its mechanical and thermal properties it is, however, well described by a two-phase structure, which contains as morphological components the highly-ordered, crystalline intermediate filaments (IFs) and the less-ordered, amorphous matrix. The presence of elastic IFs alongside the viscous matrix, results in the viscoelastic properties of human hair. Investigated here are the viscoelastic properties of human hair after two academically and commercially relevant chemical modifications: esterification
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2

Montillo, Marta <1986&gt. "Hormonal parameters in foal hair: from birth to post weaning." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6254/.

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The aim of this study was to investigate cortisol and progesterone (P4) trends in hair from birth up to postweaning in Italian trotter foals. Hair sampling is non-invasive and hair concentrations provide retrospective information of integrated hormone secretion over periods of several months. Samples were collected at birth and at a distance of 30 days, collecting only regrowth hair, up to post weaning. From birth to 3 months, foals cortisol falls from 47.64±5.6 to 4.9±0.68 pg/mg (mean±standard error), due to the interruption of foetal-placental connection and progressive adaptation to extrau
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3

Mkentane, Kwezikazi. "Human scalp hair: geometry, biochemistry, growth parameters and mechanical characteristics." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/23419.

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Scalp hair is increasingly being used as a testing substrate for toxins and monitoring treatment adherence. The biochemistry of human hair is assumed to be similar; however, a recent study reported higher concentration of lipids in African hair. The effect of hair curvature, if any, on drug incorporation (e.g. lipid soluble drugs) is unknown. Racial description of hair morphology is unscientific. A geometric classification of hair into 8 groups (I-straight to VIII-tightly curly) was recently proposed, however its reliability has not been confirmed. The aim of this thesis was to investigate the
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4

Abou, Dakka Milad. "Linear oscillatory dynamics of flexoelectric membranes embedded in viscoelastic media with applications to outer hair cells." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114535.

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Membrane flexoelectricity is an electromechanical coupling effect between the membrane average curvature and macroscopic electric polarization. Flexolelectricity is a biological actuation mechanism involved in the functioning of hearing. This thesis uses theory and simulation to develop a fundamental understanding of flexolectricity of relevance to hearing processes by integrating membrane elasticity and flexolectricity with viscoelastic processes. Flexoelectric actuation uses an imposed electric field to create membrane bending. In this thesis we model the small amplitude oscillatory dy
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Wu, Yanzhang. "Sensing Nonlinear Viscoelastic Constitutive Parameters with a Geometrically Nonlinear Beam: Modeling and Simulation." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40910.

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In this thesis, we present a sensor model comprised of a geometrically nonlinear beam coupled with a nonlinear viscoelastic Pasternak foundation via a distributed system of compliant elements. The governing equations of the system are obtained. By posing an inverse problem, the model is used to simulate the estimation of coupled substrates' material (constitutive) parameters. In the inverse problem, beam deformations are considered as measured parameters, and therefore an eventual hardware implementation would require measurements of these quantities. Different case studies are simulated to as
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6

Casal, i. Plana Nicolau. "Identification of new physiological parameters for monitoring chronic stress in growing pigs: Hair cortisol and Chromogranin A." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/400284.

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L’objectiu principal d’aquesta tesi és identificar i estudiar la viabilitat del cortisol en pèl i de la cromogranina A (CgA) com a indicadors d’estrès crònics en porcs d’engreix. Amb aquest propòsit es van realitzar quatre estudis englobats en dos experiments. El primer estudi tenia com a objectiu determinar la viabilitat del pèl com a matriu per detectar cortisol en l’espècie porcina. Per aquest motiu, es van analitzar mostres de pèl de 56 mascles sencers creuats sotmesos a un procés de reorganització setmanal. Els resultats obtinguts van mostrar una correlació positiva de les concentracions
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7

Zeltmann, Uwe Christian [Verfasser], and A. [Akademischer Betreuer] Kirsch. "The Viscoelastic Seismic Model: Existence, Uniqueness and Differentiability with Respect to Parameters / Uwe Christian Zeltmann ; Betreuer: A. Kirsch." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1184989982/34.

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8

Taskonak, Burak. "The effects of residual stress, viscoelastic and thermodynamic parameters on apparent fracture toughness of dental bilayer ceramic composites." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0006425.

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9

Usu, Kerem. "Identification Of Soft Tissue Mechanical Material Model And Corresponding Parameters From In Vivo Experimental Data By Using Inverse Finite Element Method." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609885/index.pdf.

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The purpose of this thesis is to search for the best material model for soft biological tissues in general. Different sections of human body exhibit different responses like stress relaxation, creep, hysteresis and preconditioning to external loading conditions. These body sections can be assumed as viscoelastic, poroelastic or pseudoelastic. After making the choice of the material model from one of these for the current study, the finite element model and the material code to be used with this model have been created. The material code has also been tried on a simple finite element model befo
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10

Sousa, Dayanne Lima de. "UtilizaÃÃo da ultrassonografia e qualidade da carne de cordeiros Santa InÃs de diferentes classes sexuais submetidos à restriÃÃo alimentar." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13881.

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FundaÃÃo de Amparo à Pesquisa do Estado do CearÃ<br>Objetivou-se com o presente estudo avaliar a utilizaÃÃo da ultrassonografia e qualidade de carne de cordeiros Santa InÃs de diferentes classes sexuais submetidos à restriÃÃo alimentar. Foram utilizados 30 cordeiros, 15 castrados e 15 nÃo castrados, com aproximadamente dois meses de idade e peso corporal inicial mÃdio de 13,00  1,49 kg. Os cordeiros foram distribuÃdos em delineamento inteiramente casualizado em arranjo fatorial 3x2 (nÃvel de restriÃÃo x classe sexual), de acordo com a quantidade de alimento fornecida. A duraÃÃo do experimento
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11

Ferrence, Kimberly Diane. "Studying the effects of changing experimental parameters on the medial olivocochlear efferent fibers and outer hair cell activity by measurement of distortion product otoacoustic emissions." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015383.

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12

Didier, Pierre. "Développement d’un système à ondes acoustiques pour le suivi rhéologique de la polymérisation de protéines. Application à la maladie d’Alzheimer." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN016/document.

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La mise au point de nouveaux systèmes biocompatibles de suivi des phénomènes de polymérisation de protéines est un enjeu majeur pour la compréhension des mécanismes moléculaires en vue d’une détection et d’un traitement précoce des pathologies dites conformationnelles telles que la maladie d’Alzheimer ou les maladies à prions. Dans ces pathologies, des protéines ou des fragments de celles-ci perdent leur structure, puis s’assemblent en fibres ordonnées au sein d’agrégats. Les mécanismes moléculaires du changement de conformation d'une protéine et sa polymérisation en fibres amyloïdes sont enco
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13

Yao, Xuxia. "Studies on lyotropic chromonic liquid crystals in nematic and biphasic regions." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50131.

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Chromonic liquid crystals are a relatively new class of lyotropic liquid crystals. In an effort to understand this lyotropic phase better, studies on the phase behavior, defects formed in these systems and characterization of the order were performed. We studied three chromonic liquid crystal materials in nematic and biphasic regions: Sunset Yellow FCF (SSY, a food dye), a cationic perylene diimide derivative (PDI, a conducting dye) and cromolyn sodium (DSCG, a drug). For SSY chromonics in the nematic region, order parameters ( and ) were obtained by polarized Raman measurements. Using the ord
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14

Tardieu, Marion. "Élastographie par résonance magnétique et onde de pression guidée." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01059105.

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Les propriétés mécaniques des tissus biologiques sont des paramètres importants en médecine : ce sont des biomarqueurs du fonctionnement normal ou pathologique d'un tissu. En effet, ces propriétés peuvent être affectées par certaines conditions mécaniques telles que l'application d'une contrainte externe, comme l'hypertension ou un traumatisme, mais également par la présence de certaines maladies, telles que le cancer, la fibrose, l'inflammation, la maladie d'Alzheimer, ou bien tout simplement avec l'âge. La palpation réalisée par le médecin permet de discerner ces changements mais ce geste es
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15

Skřontová, Marie. "Vliv probíhající gravidity na mechanické parametry vlasů." Doctoral thesis, 2017. http://www.nusl.cz/ntk/nusl-357745.

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Title: Changes in the mechanical parameters of women's hair during pregnancy Matters: We can look from different angles on the hair - as on a nanocomposite fiber and as on biomaterial changing with the origin and age. The hair doesn't differ only by lenght, stucture and color but also by diameter and shape. It reflects the overall health of the individual and all the processes in the organism of the individual and thus also the pregnancy. During pregnancy, hormonal changes take place which have an effect on the hair. Many women experience faster hair growth, extension and increased volume of t
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16

Buscone, S., Andrei N. Mardaryev, B. Raafs, et al. "A new path in defining light parameters for hair growth: discovery and modulation of photoreceptors in human hair follicle." 2017. http://hdl.handle.net/10454/12062.

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Yes<br>Background and Objective: Though devices for hair growth based on low levels of light have shown encouraging results, further improvements of their efficacy is impeded by a lack of knowledge on the exact molecular targets that mediate physiological response in skin and hair follicle. The aim of this study was to investigate the expression of selected light-sensitive receptors in the human hair follicle and to study the impact of UV-free blue light on hair growth ex vivo. Material and Methods: The expression of Opsin receptors in human skin and hair follicles has been characterise
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17

Bruederlin, Barbara Bruna. "Winter hair coat parameters of pregnant beef cows from British and exotic origin." 1987. http://hdl.handle.net/1993/15433.

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18

Tsai, Pei-Shan, and 蔡佩珊. "The Development of a Systematic Analysis Procedure to Characterize the Nonlinear Viscoelastic and Visco-Damage Parameters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4xddg5.

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碩士<br>國立中興大學<br>土木工程學系所<br>106<br>Many researches issued the time-, temperature-, visco-, linear-, nonlinear-, and the damage- properties of the asphalt mixtures. But rare of studies have the effective and systematical analysis procedure. In addition, the damage density is hard to obtain due to the micro-damage area. Hence, this study presents a developed procedure to characterize the viscoelastic and visco-damage properties for decoupling the linear viscoelastic (LVE), nonlinear viscoelastic (NVE), and visco-damage (VD) behaviors of asphalt mixtures, that based on the Schapery’s nonlinear vis
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19

"Asphalt Binder Parameters and their Relationship to the Linear Viscoelastic and Failure Properties of Asphalt Mixtures." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.53877.

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abstract: Asphalt concrete is a non-homogenous viscoelastic material; its behavior depends on the properties of the asphalt binder and the aggregate skeleton. The two major distresses in flexible pavements, fatigue cracking and rutting, have different mechanisms in that the way binders and mixtures behavior are related differ. Further complicating the issues is that distresses in asphalt pavement are dependent on climate, pavement structure, and traffic loads, in addition to factors such as properties of the asphalt mixture itself. Hence, to characterize the multiscale mechanics associated wit
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20

Mignon, Charles, Natalia V. Botchkareva, N. E. Uzunbajakava, and Desmond J. Tobin. "Photobiomodulation devices for hair regrowth and wound healing: a therapy full of promise but a literature full of confusion." 2016. http://hdl.handle.net/10454/8529.

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yes<br>Photobiomodulation is reported to positively influence hair regrowth, wound healing, skin rejuvenation, and psoriasis. Despite rapid translation of this science to commercial therapeutic solutions, significant gaps in our understanding of the underlying processes remain. The aim of this review was to seek greater clarity and rationality specifically for the selection of optical parameters for studies on hair regrowth and wound healing. Our investigation of 90 reports published between 1985-2015 revealed major inconsistencies in optical parameters selected for clinical applications. M
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21

Kim, Keekyoung. "MEMS-based Mechanical Characterization of Micrometer-sized Biomaterials." Thesis, 2009. http://hdl.handle.net/1807/17783.

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The mechanical properties of biomaterials play important roles in performing their specialized functions: synthesizing, storing, and transporting biomolecules; maintaining internal structures; and responding to external environments. Besides biological cells, there are also many other biomaterials that are highly deformable and have a diameter between 1μm and 100μm, comparable to that of most biological cells. For example, many polymeric microcapsules for drug delivery use are spherical particles of micrometers size. In order to mechanically characterize individual micrometer-sized biomaterial
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