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Dissertations / Theses on the topic 'Phase function'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Rybka, Marcin. "Optical properties of MAX-phase materials." Thesis, Linköping University, Applied Optics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60008.

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<p> </p><p><p> </p></p><p><p><p> </p></p></p><p>MAX-phase materials are a new type of material class. These materials are potentiallyt echnologically important as they show unique physical properties due to the combination of metals and ceramics. In this project, spectroscopic ellipsometry in the spectral range of 0.06 eV –6.0 eV was used to probe the linear optical response of MAX-phases in terms of the complexd dielectric function <em>ε(ω) = ε1(ω) + iε2(ω<em>). </em></em>Measured data were fit to theoretical models using the Lorentz and generalized oscillator models. Data from seven differen

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2

Wunder, Daniel P. "Aerosol scattering phase function retrieval from polar orbiting satellites." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FWunder.pdf.

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3

Agyo, Sanfo David. "Bi-fractional transforms in phase space." Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/14522.

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The displacement operator is related to the displaced parity operator through a two dimensional Fourier transform. Both operators are important operators in phase space and the trace of both with respect to the density operator gives the Wigner functions (displaced parity operator) and Weyl functions (displacement operator). The generalisation of the parity-displacement operator relationship considered here is called the bi-fractional displacement operator, O(α, β; θα, θβ). Additionally, the bi-fractional displacement operators lead to the novel concept of bi-fractional coherent states. The ge

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Agyo, Sanfo D. "Bi-fractional transforms in phase space." Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/14522.

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The displacement operator is related to the displaced parity operator through a two dimensional Fourier transform. Both operators are important operators in phase space and the trace of both with respect to the density operator gives the Wigner functions (displaced parity operator) and Weyl functions (displacement operator). The generalisation of the parity-displacement operator relationship considered here is called the bi-fractional displacement operator, O(α, β; θα, θβ). Additionally, the bi-fractional displacement operators lead to the novel concept of bi-fractional coherent states.

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5

Haraldsson, Henrik. "Assessment of Myocardial Function using Phase Based Motion Sensitive MRI." Doctoral thesis, Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-60027.

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Quantitative assessment of myocardial function is a valuable tool for clinical applications and physiological studies. This assessment can be acquired using phase based motion sensitive magnetic resonance imaging (MRI) techniques. In this thesis, the accuracy of these phase based motion sensitive MRI techniques is investigated, and modifications in acquisition and post-processing are proposed. The strain rate of the myocardium can be used to evaluate the myocardial function. However, the estimation of strain rate from the velocity data acquired with phase-contrast MRI (PC-MRI) is sensitive to

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6

Can, Geylani. "S-phase checkpoint activity and function throughout the cell cycle." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/268506.

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DNA damage or replication stress during S-phase can activate the S-phase checkpoint which executes a variety of responses, such as the inhibition of origin firing and replication fork stabilisation. Deregulation of the S-phase checkpoint leads to genomic instability, which has been implicated in diseases such as cancer. In this thesis, I aimed to address whether the S-phase checkpoint is regulated outside of S-phase, and how the S-phase checkpoint targets its substrates in budding yeast. Although this checkpoint has thus far been associated exclusively with S-phase, it remains unknown whether

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7

Galanis, Andreas. "Phase transitions in the complexity of counting." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52211.

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A recent line of works established a remarkable connection for antiferromagnetic 2-spin systems, including the Ising and hard-core models, showing that the computational complexity of approximating the partition function for graphs with maximum degree \Delta undergoes a computational transition that coincides with the statistical physics uniqueness/non-uniqueness phase transition on the infinite \Delta-regular tree. Despite this clear picture for 2-spin systems, there is little known for multi-spin systems. We present the first analog of the above inapproximability results for multi-spin syst

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8

Konovalova, V. V., G. A. Pobigay, Y. M. Samchenko, A. F. Burban, and Z. R. Ulberg. "Nanocomposite Membranes with pH- and Thermo-sensitive Function." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35333.

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Resent researches and development in the field of membrane science are focused on improvement of synthetic membranes’ functionality. Combination of soft polymer pH- and temperature-sensitive hydrogels with rigid ultrafiltration membrane attracts much interest as a new class of smart functional systems. In this research we develop pH- and temperature-sensitive composite membranes using radical copolymerization method and study their properties depending on hydrogel composition, nature of synthetic mem-branes, temperature and pH of external medium. When you are citing the document, use the follo

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9

Aouni, Jihane. "Utility-based optimization of phase II / phase III clinical development." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS032/document.

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Le développement majeur de la thèse a été consacré au problème d’optimisation du choix de dose dans les essais de recherche de dose, en phase II. Nous avons considéré ce problème sous l’angle des fonctions d’utilité. Nous avons alloué une valeur d’utilité aux doses, le problème pour le sponsor étant de trouver la meilleure dose, c’est-à-dire celle dont l’utilité est la plus élevée.Dans ce travail, nous nous sommes limités à une seule fonction d’utilité, intégrant deux composantes: une composante liée à l’efficacité (la POS=puissance d’un essai de phase III de 1000 patients de cette dose contre

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10

Engblom, Johan. "On the phase behaviour of lipids with respect to skin barrier function." Lund, Sweden : Dept. of Food Technology, Lund University, 1996. http://books.google.com/books?id=TdFqAAAAMAAJ.

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11

Mentlak, Thomas Andrew. "Investigating LysM effector function and the biotrophic growth phase of Magnaporthe oryzae." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3870.

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During intracellular biotrophic growth, the rice blast fungus Magnaporthe oryzae secretes a large battery of effector proteins, which are thought to suppress host cell defence responses. Although a number of these effector proteins have been identified, their precise biological functions and contribution towards plant infection remains unclear. In this thesis, I report that during biotrophic growth, the secretion of a LysM effector protein, Slp1, is required for rice blast disease. I show that Slp1 binds chitin and is able to suppress the chitin-induced oxidative burst and defence gene-express

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12

Farquharson, Maree Louise. "Estimating the parameters of polynomial phase signals." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16312/1/Maree_Farquharson_Thesis.pdf.

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Nonstationary signals are common in many environments such as radar, sonar, bioengineering and power systems. The nonstationary nature of the signals found in these environments means that classicalspectralanalysis techniques are notappropriate for estimating the parameters of these signals. Therefore it is important to develop techniques that can accommodate nonstationary signals. This thesis seeks to achieve this by firstly, modelling each component of the signal as having a polynomial phase and by secondly, developing techniques for estimating the parameters of these components. Several

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Farquharson, Maree Louise. "Estimating the parameters of polynomial phase signals." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16312/.

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Nonstationary signals are common in many environments such as radar, sonar, bioengineering and power systems. The nonstationary nature of the signals found in these environments means that classicalspectralanalysis techniques are notappropriate for estimating the parameters of these signals. Therefore it is important to develop techniques that can accommodate nonstationary signals. This thesis seeks to achieve this by firstly, modelling each component of the signal as having a polynomial phase and by secondly, developing techniques for estimating the parameters of these components. Several app

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14

Freund, Robert M. "A Potential Reduction Algorithm With User-Specified Phase I - Phase II Balance, for Solving a Linear Program from an Infeasible Warm Start." Massachusetts Institute of Technology, Operations Research Center, 1991. http://hdl.handle.net/1721.1/5409.

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This paper develops a potential reduction algorithm for solving a linear-programming problem directly from a "warm start" initial point that is neither feasible nor optimal. The algorithm is of an "interior point" variety that seeks to reduce a single potential function which simultaneously coerces feasibility improvement (Phase I) and objective value improvement (Phase II). The key feature of the algorithm is the ability to specify beforehand the desired balance between infeasibility and nonoptimality in the following sense. Given a prespecified balancing parameter /3 > 0, the algorithm maint

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15

Mellechervu, Karthik. "Modeling of Transient Thrust of a Two Phase Propellant Tank." Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1231561130.

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16

Higgins, Johanne. "Correlates of recovery of upper extremity function in the acute phase post stroke." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0027/MQ50786.pdf.

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17

Milet, Sylvain F. "Visualization and quanification of early diastolic function by magnetic resonance phase velocity mapping." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16109.

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18

Scahill, David. "The South Stoa at Corinth : design, construction and function of the Greek phase." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558903.

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The focus of this dissertation is the design, construction and function of the South Stoa at Corinth in its initial phase. The South Stoa was first published in a monograph by Oscar Broneer in 1954.1 In addition to dealing with the Greek and Roman phases of the building, Broneer’s study also dealt with the “pre-stoa” remains. Certain aspects of the architecture of the stoa, however, were either treated only briefly or were entirely left out of the publication. While it was one of the first attempts at a full study of a secular Greek building, several conclusions deserve re-evaluation, includin

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19

De, Oliveira Dominic. "Phase and structural changes of nickel catalysts as a function of reaction conditions." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31520.

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Carbon dioxide hydrogenation is a route for the production of methane from hydrogen and carbon dioxide, which has attracted increased attention in recent times. It provides a means for both energy storage through substitute natural gas (SNG) production and as a process for the conversion of carbon dioxide into valuable products. Ni is the most widely used metal for SNG production due to its high activity, high selectivity towards methane and low cost in comparison to the other active metals. Ni catalysts have been extensively studied due to their uses in steam reforming and CO methanation, and

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20

Rahmat, Sarah Binti. "Development of a fast method for the psychophysical estimation of nonlinear cochlear function using schroeder-phase masking." Thesis, University of Canterbury. Communication Disorders, 2015. http://hdl.handle.net/10092/11268.

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In many previous physiological and psychoacoustic studies, Schroeder-phase masking (using Schroeder harmonic complexes to mask other sounds) has proven useful in understanding different aspects of cochlear function, particularly the phase curvature of the cochlea and cochlear nonlinearity. The common method of measuring Schroeder-phase masking functions uses a very time consuming three-alternative forced choice (3AFC) process, which limits its research and clinical usefulness. This thesis describes a fast method for measuring Schroeder-phase masking functions that we developed to address this

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21

Hadhrami, Hilal Al. "Phase space methods in finite quantum systems." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4250.

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Quantum systems with finite Hilbert space where position x and momentum p take values in Z(d) (integers modulo d) are considered. Symplectic tranformations S(2ξ,Z(p)) in ξ-partite finite quantum systems are studied and constructed explicitly. Examples of applying such simple method is given for the case of bi-partite and tri-partite systems. The quantum correlations between the sub-systems after applying these transformations are discussed and quantified using various methods. An extended phase-space x-p-X-P where X, P ε Z(d) are position increment and momentum increment, is introduced. In thi

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22

George-Reichley, Debra G. "Potential muscle function during the swing phase of stroke gait an induced acceleration study /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 51 p, 2008. http://proquest.umi.com/pqdweb?did=1481669451&sid=10&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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23

Marklund, Sandra. "Feasibility Study of Phase Measurements of the Arterial Input Function in Dynamic Contrast Enhanced MRI." Thesis, Umeå University, Radiation Physics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-23226.

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<p> </p><p>Acquired data from dynamic contrast enhanced MRI measurements can be used to non-invasively assess tumour vascular characteristics through pharmacokinetic modelling. The modelling requires an arterial input function which is the concentration of contrast agent in the blood reaching the volume of interest as a function of time. The aim of this work is testing and optimizing a turboFLASH sequence to appraise its suitability for measuring the arterial input function by measuring phase.</p><p>Contrast concentration measurements in a phantom were done with both phase and relaxivity techn

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24

Sarafraz, Yazdi Hossein. "Fractional Fourier transform and its optical applications." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/992.

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A definition of fractional Fourier transform as the generalization of ordinary Fourier transform is given at the beginning. Then due to optical reasons the fractional transform of a so-called chirp functions is considered in both theory and practical simulations. Because of a quadratic phase factor which is common in the definition of the transform and some optical concepts, a comparison between these concepts such as Fresnel diffraction, spherical wave, thin lens and free space propagation and the transform has been done. Finally an optical setup for performing the fractional transform is in

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25

Cankaya, Erkan. "Use Of The Ambiguity Function Technique For Target Detection In Phase Coded Continuous Wave Radars." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606767/index.pdf.

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The goal of this thesis study is to investigate the Ambiguity Function Technique for target detection in phase-coded continuous wave radar. Also, phase shift keying techniques are examined in detail. Continuous Wave (CW) Radars, which are also known as Low Probability of Intercept (LPI) radars, emit continuous signals in time which are modulated by either frequency modulation or phase modulation techniques. Modulation of the transmitted radar signal is needed to estimate both the range and the radial velocity of the detected targets. In this thesis, Phase Shift Keying (PSK) techniques such as

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26

Webber, Michael L. "Phase Shift Control: Application and Performance Limitations With Respect to Thermoacoustic Instabilities." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/36418.

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<p> Lean premixed fuel-air conditions in large gas turbines are used to improve efficiency and reduce emissions. These conditions give rise to large undamped pressure oscillations at the combustor's natural frequencies which reduce the turbine's longevity and reliability. Active control of the pressure oscillations, called thermoacoustic instabilities, has been sought as passive abatement of these instabilities does not provide adequate damping and is often impractical on a large scale. Phase shift control of the instabilities is perhaps the simplest and most popular technique employed but

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27

Sargent, Eva Lee. "The effects of intraluteal infusion of prostaglandin-synthesis inhibitors on the function of the primate corpus luteum." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184406.

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Exogenous prostaglandins (PGs) have been reported to suppress or to promote the function of the primate corpus luteum in vitro and in vivo, but the role of endogenous ovarian prostaglandins in regulating luteal function during the menstrual cycle is unknown. Infusion (via osmotic pump) of the prostaglandin-synthesis inhibitor sodium meclofenamate into the corpus luteum, but not via the jugular vein, during the midluteal phase of the menstrual cycle resulted in a decline in progesterone levels and premature menses in rhesus monkeys (Macaca mulatta). These results suggest that meclofenamate supp

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28

Vine, David John. "New quantitative methods in analyser-based phase contrast X-ray imaging." Monash University. Faculty of Science. School of Physics, 2008. http://arrow.monash.edu.au/hdl/1959.1/57830.

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New quantitative methods are developed for analyser-based phase contrast imaging (ABI) with hard X-rays. In the first instance we show that quantitative ABI may be implemented using an extended incoherent source. Next, we outline how complex Green’s functions may be reconstructed from phase contrast images and we apply this method to reconstruct the thick perfect crystal Green’s function associated with an ABI imaging system. The use of quantitative ABI with incoherent X-ray sources is not widespread and the first set of results pertains to the feasibility of quantitative ABI imaging and phas

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内藤, 尚., Hisashi NAITO, 雄嗣松崎 та ін. "繰返し荷重を加えたTiNi形状記憶合金ワイヤの応力ーひずみー温度関係の計測および数値解析". 日本機械学会, 2003. http://hdl.handle.net/2237/9074.

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30

Arnison, Matthew Raphael. "Phase control and measurement in digital microscopy." Thesis, The University of Sydney, 2003. http://hdl.handle.net/2123/569.

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The ongoing merger of the digital and optical components of the modern microscope is creating opportunities for new measurement techniques, along with new challenges for optical modelling. This thesis investigates several such opportunities and challenges which are particularly relevant to biomedical imaging. Fourier optics is used throughout the thesis as the underlying conceptual model, with a particular emphasis on three--dimensional Fourier optics. A new challenge for optical modelling provided by digital microscopy is the relaxation of traditional symmetry constraints on optical design

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31

Persson, Örjan. "General stress proteins : novel function and signals for induction of stationary phase genes in E. coli /." Göteborg : Department of Cell and Molecular Biology, University of Gothenburg, 2010. http://hdl.handle.net/2077/22213.

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32

Ramirez, Suarez Oscar Leonardo. "The effective-range function in nuclear physics: a method to parameterize phase shifts and extract ANCs." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209157.

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The connection between phase shifts and the ANC has been explored in the frame of the effective range theory. The main result is that, in practice and under rather simple requirements, scattering states (phases shifts) can be correctly described and connected with bound states via the effective range function, and therefore, ANCs can be accurately determined thanks to the analytic properties of this function. This result has an important impact in stellar evolution due to the ANC and phases shifts are directly connected with capture cross sections which, for instance, determine partially the s

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Arnison, Matthew Raphael. "Phase control and measurement in digital microscopy." University of Sydney. Physics, 2003. http://hdl.handle.net/2123/569.

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The ongoing merger of the digital and optical components of the modern microscope is creating opportunities for new measurement techniques, along with new challenges for optical modelling. This thesis investigates several such opportunities and challenges which are particularly relevant to biomedical imaging. Fourier optics is used throughout the thesis as the underlying conceptual model, with a particular emphasis on three--dimensional Fourier optics. A new challenge for optical modelling provided by digital microscopy is the relaxation of traditional symmetry constraints on optical design

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Жаба, В. І. "Асимптотики фазової і хвильової функцій по методу фазових функцій". Thesis, Сумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/45793.

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Для одноканального нуклон-нуклонного розсіяння розглянуто асимптотики фазової і хвильової функції по методу фазових функцій. Оскілки нам відомі асимптотики для фазової функції, то їх можна використати для запису асимптотики хвильової функції поблизу початку координат.

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Zhou, Jing. "Experimental study of phase separation in Fe-Cr based alloys." Licentiate thesis, KTH, Metallografi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119230.

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Duplex stainless steels (DSSs) are important engineering materials due to their combination of good mechanical properties and corrosion resistance. However, as a consequence of their ferrite content, DSSs are sensitive to the so-called ‘475°C embrittlement’, which is induced by phase separation, namely, the ferrite decomposed into Fe-rich ferrite (α) and Cr-rich ferrite (α'), respectively. The phase separation is accompanied with a severe loss of toughness. Thus, the ‘475°C embrittlement’ phenomenon limits DSSs’ upper service temperature to around 250°C. In the present work, Fe-Cr binary model

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O'Bree, Terry Adam, and s9907681@student rmit edu au. "Investigations of light scattering by Australian natural waters for remote sensing applications." RMIT University. Applied Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080110.140055.

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Remote sensing is the collection of information about an object from a distance without physically being in contact with it. The type of remote sensing of interest here is in the form of digital images of water bodies acquired by satellite. The advantage over traditional sampling techniques is that data can be gathered quickly over large ranges, and be available for immediate analysis. Remote sensing is a powerful technique for the monitoring of water bodies. To interpret the remotely sensed data, however, knowledge of the optical properties of the water constituents is needed. One

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Kowalski, Michael Władisław. "Comparative study of oscillatory integral, and sub-level set, operator norm estimates." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4687.

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Oscillatory integral operators have been of interest to both mathematicians and physicists ever since the emergence of the work Theorie Analytique de la Chaleur of Joseph Fourier in 1822, in which his chief concern was to give a mathematical account of the diffusion of heat. For example, oscillatory integrals naturally arise when one studies the behaviour at infinity of the Fourier transform of a Borel measure that is supported on a certain hypersurface. One reduces the study of such a problem to that of having to obtain estimates on oscillatory integrals. However, sub-level set operators have

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Pulpitel, Tamara. "Ecological Immunology: Immune Defence Strategies of Australian Locusts." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12834.

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This thesis looks at the immunology of Australian locusts in a broad ecological context. By investigating some of the ecological parameters commonly known to influence locusts, this work ties many of the underlying immune-based mechanisms of locusts, ultimately providing insight into the success of these animals in the field. In the context of locust biocontrol strategies, this is particularly important. In Chapter 2, the density-dependent prophylaxis hypothesis was tested in Chortoicetes terminifera; a theory predicting that group-living animals invest more in immune function compared to soli

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Balkew, Teshome Mogessie. "The SIR Model When S(t) is a Multi-Exponential Function." Digital Commons @ East Tennessee State University, 2010. https://dc.etsu.edu/etd/1747.

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The SIR can be expressed either as a system of nonlinear ordinary differential equations or as a nonlinear Volterra integral equation. In general, neither of these can be solved in closed form. In this thesis, it is shown that if we assume S(t) is a finite multi-exponential, i.e. function of the form S(t) = a+ ∑nk=1 rke-σkt or a logistic function which is an infinite-multi-exponential, i.e. function of the form S(t) = c + a/b+ewt, then we can have closed form solution. Also we will formulate a method to determine R0 the basic reproductive rate of an infection.

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Engvall, Gunn. "Cancer during Adolescence : Coping Shortly after Diagnosis and Psychosocial Function during the Acute and Extended Phase of Survival." Doctoral thesis, Uppsala universitet, Pediatrik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157094.

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In this thesis coping shortly after diagnosis and psychosocial function during the acute and extended phase of survival was investigated for individuals struck by cancer during adolescence. Sixty-one participants were recruited and data were collected from four to eight weeks (T1) up to four years (T7) after diagnosis. Study I: the aim was to describe how participants (n=56) cope with cancer-related distress in response to closed and open-ended questions. In response to closed-ended questions, the majority reported emotion-focused strategies, and in response to open-ended questions they report

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Carpels, Simon. "Royal Power and Bureaucracy : The Function of the Högste Ombudsman in the Last Phase of theGreat Northern War." Thesis, Uppsala universitet, Historiska institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176500.

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The power struggle between the Charles XII and his bureaucracy after the crushing defeat inPoltava (1709) mainly concerned the unwillingness of the latter to raise a new army that could beshipped to Pomerania. In reaction to this disobedience the king reformed his bureaucracy.Among other things, the Carolinian reforms introduced the högste ombudsman. The office was toenforce the law and supervise all civil servant and military officers. This thesis deals with thequestion of how the högste ombudsman functioned within this power struggle. The source materialconsists of the correspondence between

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Chan, Christopher K. W. "Potential prebiotic roles of (amino-)acylation in the synthesis and function of RNA." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/245078.

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The Sutherland group recently demonstrated that from a mixture of oligoribonucleotide-2'- or 3'-phosphates the latter is chemoselectively acetylated. This is shown to mediate a template-directed ligation to give predominantly 3',5'-linked RNA that is acetylated at the ligation junction (acetyl-RNA). It was suggested that RNA emerged prebiotically via acetyl-RNA and also is proposed to have favourable genotypic properties due to greater propensity to form duplex structure. To study the properties of acetyl-RNA, their synthesis by solid-phase chemistry was required and described is the design of

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Zhou, Jing. "An Atom-Probe Tomography Study of Phase Separation in Fe-Cr Based Steels." Doctoral thesis, KTH, Metallografi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150796.

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Stainless steels are very important engineering materials in a variety of applications such as in the food industry and nuclear power plants due to their combination of good mechanical properties and high corrosion resistance. However, ferrite-containing stainless steels are sensitive to the so-called ‘475°C embrittlement’, which is induced by phase separation of the ferrite phase, where it decomposes into Fe-rich ferrite (α) and Cr-rich ferrite (α'). The phase separation is accompanied with a severe loss of toughness. Therefore, the upper service temperature of ferrite-containing stainless st

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Nowotny, Thomas. "Phase transitions and multifractal properties of random field Ising models." Doctoral thesis, Universitätsbibliothek Leipzig, 2004. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-37023.

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In dieser Arbeit werden Zufallsfeld-Ising-Modelle mit einem eingefrorenen dichotomen symmetrischen Zufallsfeld für den eindimensionalen Fall und das Bethe-Gitter untersucht. Dabei wird die kanonische Zustandssumme zu der eines einzelnen Spins in einem effektiven Feld umformuliert. Im ersten Teil der Arbeit werden das mulktifraktale Spektrum dieses effektiven Feldes untersucht, Übergänge im Spektrum erklärt und Ungleichungen zwischen lokalen und globalen Dimensionsbegriffen bewiesen, die eine weitgehend vollständige Charakterisierung des multifraktalen Spektrums durch eine Reihe von Schranken e

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El, hog Sahbi. "Transition de phase dans les films magnétiques minces avec interactions concurrentes." Thesis, Cergy-Pontoise, 2017. http://www.theses.fr/2017CERG0843/document.

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Dans cette thèse nous étudions les transitions de phase et leurs propriétés thermodynamiques au sein de couches minces en se basant sur des simulations Monte-Carlo et sur le formalisme de la fonction de Green .Dans le premier chapitre, nous étudions le modèle de Blume-Emery-Griffith pour un film mince sur réseaux triangulaires empilés. Le spin $S_i$ dans ce modèle prend trois valeurs (+/-1,0). Notre travail a été motivé par le désir de vérifier si a nature de la transition de phase se conserve quand on réduit l'épaisseur du film. En utilisant la simulation Monte Carlo, nous montrons qu'il exis

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Engler, William O. III. "A methodology for creating expert-based quantitative models for early phase design." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47670.

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Early systems engineering and requirements definition requires quantitative information about potential solutions prior to having sufficient information or time to develop detailed models. This research develops and demonstrates a transparent and repeatable process for rapidly creating quantitative models that leverage existing expert knowledge. This process is built upon established modeling frameworks and current literature for low fidelity modeling and hierarchical expert-based methods. The process includes system definition using interactive morphological analysis and gathering informatio

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Hirschhorn, Andrew David. "Coronary Artery Bypass Graft Surgery: Exercise Testing and Prescription in the Acute Perioperative Phase." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/367852.

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The general aim of the research presented in this thesis was to investigate the impact of Phase I (in-hospital) physiotherapy intervention on the restoration of functional capacity after coronary artery bypass graft surgery (CABG).<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Physiotherapy and Exercise Science<br>Griffith Health<br>Full Text

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Pardo, Gonzalez Mauricio. "MEMS-based phase-locked-loop clock conditioner." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43643.

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Ultra narrow-band filters and the use of two loops in a cascade configuration dominate current clock conditioners based on phase-locked-loop (PLL) schemes. Since a PLL exhibits a low-pass transfer function with respect to the reference clock, the noise performance at very close-to-carrier offset frequencies is still determined by the input signal. Although better cleaning can be achieved with extremely narrow loops, an ultra low cut-off frequency could not be selected since the stability of the configuration deteriorates as the filter bandwidth is reduced. This fact suggests that a full-spectr

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Hehn, Anna-Sophia [Verfasser], and W. [Akademischer Betreuer] Klopper. "Explicitly correlated random-phase approximation: Development and application of a wave-function method / Anna-Sophia Hehn ; Betreuer: W. Klopper." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1170230539/34.

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Gebretsadik, Adane Samuel Gebretsadik. "INTERPLAY BETWEEN CHEMICAL AND MAGNETIC DISORDER IN SELECTED ALLOYS CLOSE TO A FERROMAGNETIC QUANTUM PHASE TRANSITION." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1527609152939816.

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