Дисертації з теми "Optimized spectroscopy"
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Mishra, Rituraj. "Studies on long-lived states and coherences in NMR." Thesis, IIT Delhi, 2019. http://eprint.iitd.ac.in:80//handle/2074/8060.
Повний текст джерелаMurcia, Salazar Clara Paola. "THz emission from optimized p-doped silicon top devices." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 64 p, 2007. http://proquest.umi.com/pqdweb?did=1338919401&sid=8&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаWiens, Andreas [Verfasser]. "Optimized high energy resolution in γ-ray spectroscopy with AGATA triple cluster detectors / Andreas Wiens". München : Verlag Dr. Hut, 2011. http://d-nb.info/1018981853/34.
Повний текст джерелаAtkins, Reginald Morley. "Impedance Optimized Electric Pulses for Enhancing Cutaneous Gene Electrotransfer." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6612.
Повний текст джерелаKoos, Martin R. M. [Verfasser], and B. [Akademischer Betreuer] Luy. "Novel Methods for Modern NMR Spectroscopy - Optimized Pulses and New Experiments / Martin R. M. Koos ; Betreuer: B. Luy." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1141792621/34.
Повний текст джерелаZhang, Jingdong, and 張敬東. "Development of optimized deconvoluted coincidence doppler broadening spectroscopy and deep level transient spectroscopies with applicationsto various semiconductor materials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38279010.
Повний текст джерелаEstupiñán, Méndez Diego [Verfasser], and C. [Akademischer Betreuer] Barner-Kowollik. "Synthesis of Polymer Networks as Optimized Alignment Media for NMR Spectroscopy / Diego Estupiñán Méndez ; Betreuer: C. Barner-Kowollik." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1195049048/34.
Повний текст джерелаAsare, Shardrack O. "Optimized Acid/Base Extraction and Structural Characterization of β-glucan from Saccharomyces Cerevisiae". Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etd/2513.
Повний текст джерелаZhang, Jingdong. "Development of optimized deconvoluted coincidence doppler broadening spectroscopy and deep level transient spectroscopies with applications to various semiconductor materials." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38279010.
Повний текст джерелаXu, Mengyun. "Optimised label-free biomarker assays with electrochemical impedance spectroscopy." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:e527a06b-25e5-48fe-8be5-3c0c10210b74.
Повний текст джерелаLenoir-Capello, Rachel. "Specific labeling strategies for new developments in liquid state protein NMR." Thesis, Sorbonne université, 2020. https://accesdistant.sorbonne-universite.fr/login?url=http://theses-intra.upmc.fr/modules/resources/download/theses/2020SORUS056.pdf.
Повний текст джерелаNuclear Magnetic Resonance (NMR) provides valuable structural and dynamic information at the atomic scale, however, the low sensitivity and resolution of signals rapidly preclude investigations of larger molecular objects. We present three isotopic labeling strategies for different protein-solution NMR experiments and demonstrate their potential for the structural study of biomolecules in solution. Among the strategies considered, two are based on the use of in vitro protein expression to obtain selectively labeled proteins of a certain chemical group and/or amino acid in a perdeuterated environment. Perdeuteration is essential for the optimal use of Transverse Relaxation Optimized Spectroscopy pulse sequences. They allowed significant spectral gains when samples were specifically labeled on amide groups or on the methylene of glycines while maintaining a very high rate of deuteration on the other chemical functions of the proteins. The third protein labeling strategy employed is based on in vivo protocols but used in innovative NMR applications: a technique of hyperpolarization of nuclei in solution which increases their sensitivity by several orders of magnitude. The lifetime of this hyperpolarization is governed by the longitudinal relaxation time of nuclei, which are reduced for proteins at room temperature. By isolating the nuclei of interest in a perdeuterated environment, dipolar interactions created by neighboring protons were eliminated and hyperpolarized nuclei relaxed much more slowly. Hyperpolarization of a small protein domain was successfully undertaken at 1K but the dissolution conditions need to be improved in order to preserve a homogeneous aqueous phase
Parsons, Helen Michelle. "Optimised spectral processing and lineshape analysis in 2-dimensional J-resolved NMR spectroscopy based metabolomics." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/816/.
Повний текст джерелаLuciano, Nicola. "An optimized hybrid data reduction strategy in 1D Raman/Rayleigh spectroscopic measurements of turbulent flames." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC026.
Повний текст джерелаA variety of technical applications in energy conversion are based on turbulent combustion. Despite the advanced contest of operation, (turbulent) combustion science is at a relatively young stage. Detailed investigations of benchmark flames are essential to achieve a better understanding of the physics behind the mentioned processes, as well as to provide reliable database for validating numerical models developed to simulate turbulent combustion problems. Raman/Rayleigh spectroscopy is a highly valuable technique which allows to access simultaneous information on temperature and main chemical species concentration within the flame structures. The data reduction strategy applied with this technique is crucial, in order to extract reliable information from the experimental investigations. In this this thesis, a modified version of the strategy, based on the Hybrid Method by Fuest et al., has been developed and tested using NLP problem solving techniques, including global optimization methods and a genetic algorithm. The proposed strategy allows for a significant reduction of the data processing time, requires less user’s expertise and returns better results in reduced measurements error. The modified routine has been applied to data set provided by an experimental investigation of two turbulent premixed methane/air jet flames belonging to the flamelet regime of turbulent premixed combustion. The data set is composed by multiple scalars, including major species and temperature, simultaneously measured with single-shot 1D Raman/Rayleigh spectroscopy. The results of the measurements are analyzed and discussed
Mumuni, Abdul Nashirudeen. "Investigation of brain tissue water NMR response by optimised quantitative single-voxel proton magnetic resonance spectroscopy." Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4717/.
Повний текст джерелаBellomo, Giovanni. "MR spectroscopy in human prostate: in vitro and in vivo measurements to optimize new quantification algorithms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9259/.
Повний текст джерелаFlick, Johannes. "Exact nonadiabatic many-body dynamics." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17581.
Повний текст джерелаMany natural and synthetic processes are triggered by the interaction of light and matter. All these complex processes are routinely explained by employing various approximations. In the first part of this work, we assess the validity of the Born-Oppenheimer approximation in the case of equilibrium and time-resolved nonequilibrium photoelectron spectra for a vibronic model system of Trans-Polyacetylene. We show that spurious peaks appear for the vibronic spectral function in the Born-Oppenheimer approximation, which are not present in the exact spectral function of the system. This effect can be traced back to the factorized nature of the Born-Oppenheimer initial and final photoemission states. In the nonequilibrium case, we illustrate for an initial Franck-Condon excitation and an explicit pump-pulse excitation how the vibronic wave packet motion can be traced in the time-resolved photoelectron spectra as function of the pump-probe delay. In the second part of this work, we aim at treating both, matter and light, on an equal quantized footing. We apply the recently developed quantum electrodynamical density-functional theory, (QEDFT), which allows to describe electron-photon systems fully quantum mechanically. We present the first numerical calculations in the framework of QEDFT. We focus on the electron-photon exchange-correlation contribution by calculating exact Kohn-Sham potentials in real space using fixed-point inversions and present the performance of the first approximate exchange-correlation potential based on an optimized effective potential approach for a Jaynes-Cummings-Hubbard dimer. This work opens new research lines at the interface between materials science and quantum optics.
Luciano, Nicola [Verfasser], Christian Akademischer Betreuer] Hasse, Gaetano [Akademischer Betreuer] [Continillo, and Nico J. [Akademischer Betreuer] Dam. "An optimized hybrid data reduction strategy in 1D Raman/Rayleigh spectroscopic measurements of turbulent flames / Nicola Luciano ; Christian Hasse, Gaetano Continillo, Nico J. Dam." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207999474/34.
Повний текст джерелаLuciano, Nicola [Verfasser], Christian [Akademischer Betreuer] Hasse, Gaetano [Akademischer Betreuer] Continillo, and Nico J. [Akademischer Betreuer] Dam. "An optimized hybrid data reduction strategy in 1D Raman/Rayleigh spectroscopic measurements of turbulent flames / Nicola Luciano ; Christian Hasse, Gaetano Continillo, Nico J. Dam." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207999474/34.
Повний текст джерелаLatreche, Mansour. "Maîtrise de la stabilité physique des alliages moléculaires amorphes pour optimiser l'efficacité des médicaments." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R039/document.
Повний текст джерелаThe formulation of pharmaceutical active principles (PA) in the amorphous state is a major current concern of pharmaceutical engineering because it improves the solubility of poorly soluble (PA). Its optimization requires a perfect knowledge of the solubility curve of (PA) in the polymer, so as to define the maximum level of (PA) that can be loaded into the polymer without the risk of subsequent recrystallization. The determination of this solubility curve is, however, extremely difficult because of the high viscosity of the polymers which makes the saturated states very difficult to achieve. In this thesis, we present an efficient method for determining solubility curves that allows us to overcome the kinetic limitations related to viscosity. The general idea is to use molecular and crystalline dispersions (MCDs) in which (PA) is dispersed in the polymer, partly at the molecular level and partly in the form of tiny crystallites. This particular microstructure greatly increases the dissolution rate of the crystallites since: (1) Molecular dispersion has a plasticizing effect which greatly increases the molecular mobility in the amorphous matrix. (2) The fine crystallite dispersion strongly reduces the distances over which the API molecules must diffuse to invade the polymer. The method was developed and tested on two (PA) (sulindac and paracetamol) and a polymer (polyvinylpyrrolidon). The study of solubility curves also allowed us to specify the polymorphism of sulindac and paracetamol, and in particular the stability relationships of the polymorphs studied
Wu, Jin-Neng, and 吳金能. "optimized UV curing time in forming PSBPs as determined by dielectric spectroscopy." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/35kd36.
Повний текст джерела國立交通大學
光電科技學程
105
This thesis focuses on investigating the optimized ultraviolet (UV) curing time in forming PSBPs as determined by means of dielectric spectroscopy. In experiments, we firstly choose a well-known nematic liquid crystal (NLC) E7 as the host and two types of monomer (i.e., RM257 and TMPTA) and fabricate three NLC/monomer mixtures. They are E7/RM257, E7/TMPTA and E7/RM257/ TMPTA. In this stage, the UV exposure process was carried out at the temperature of T = 30 C. Based on dielectric results, we analyze the dielectric spectra within the frequency reigme of 1 kHz10 kHz to find out time dependence of dielectric properties of the NLC/monomer caused by the UV exposure and thus the induction of photopolymerization. We found that if we extend the UV exposure time the spectrum of the imaginary part of the dielectric will trend down gradually. After the minimum value of the trend, the dielectric properties are the same as the original LC. Extending this approach to polymer stabilized blue phases (PSBPs), we further investigate and confirm the optimized UV exposure time for BPLC/monomer mixture by means of the technology of dielectric phase transition temperature and optical texture to verify dielectric spectra results. Based on experimental results, the phase transition temperature of each sample will be identical if the UV irradiation time is longer than the critical time tc. and sample still keep the blue-phase state to low temperature (T = 10 ºC). However, the phase transition temperature of each sample would be different and the blue-phase state can not be maintained at low temperature (T = 10 ºC). For longer UV time (t > tc), the internal monomer has been completely cured to polymer network that stabilized the blue phase liquid crystal lattice, whereas the blue phase liquid crystal has been successfully formed PSBP. According to the above results, we can use the trend of dielectric spectrum to find best PSBP UV curing time (tc).
Amaral, Cristiano José da Silva Barros. "Optimized, automated shimming procedure for improved experimental cardiac magnetic resonance imaging and spectroscopy at ultra-high magnetic fields." Master's thesis, 2012. http://hdl.handle.net/10400.14/14075.
Повний текст джерелаBackground: Cardiac magnetic resonance imaging and spectroscopy are tools to non-invasively characterize rodent models of human heart disease. The experiments are typically carried out on dedicated MR systems equipped with ultra-high field magnets (≥ 7 Tesla). One fundamental requirement of MR is the homogeneity of the static magnetic field B0 (Grutter, 1993), and fluctuations of the main magnetic field (B0 inhomogeneities) within the scan region should be less than three parts per million (3 ppm). Inserting a sample inherently increases the field inhomogeneity (due to different degree of magnetization across the sample in response to the B0 field (“magnetic susceptibility”)), which needs to be compensated for (Crijns et al, 2011; Koch et al, 2006). Homogenizing (i.e. shimming) the static magnetic field is crucial for any MR experiment in order to maximize resolution and signal-to-noise. This is particularly important at ultra-high magnetic fields due to linear dependence of magnetic susceptibility. Adjusting the three linear and typically up to 14 higher order shims manually is laborious and subjective. Moreover, this process is particularly challenging where various tissues (i.e. heart and skeletal muscle, bone, lungs and flowing blood) are in close vicinity within the chest, each having different magnetic susceptibilities and relative motions. Auto-shim methods such as FASTMAP or FASTERMAP (Shen et al, 1997), are clinically and experimentally well established in brain tissue, but inevitably fail in the heart due to the ill-defined phase of the MR-signal, particularly inside the ventricles. Based on a technique, previously applied to human brain – implemented a novel approach for the application to mouse hearts in vivo, that is able to homogenize the B0-field in an arbitrarily shaped, but connected region of interest. Aim: The aim of this project is to investigate optimal scan parameters and post-processing approach to optimize and advance an automated shimming procedure for improved experimental cardiac magnetic resonance imaging and spectroscopy at ultra-high magnetic fields. Methods: Mice (n = 5) underwent MR experiments carried out in a 9.4 Tesla (T) horizontal magnet. The image acquisition was performed using fast gradient echo sequences varying the following parameters: resolution, flow compensation on / off, orientation (short-axis / axial), and dimension (2D multislice vs 3D). Three different shim coils’ configurations (shim coils up to the third order) were investigated and optimal MR sequence was assessed. Results: The threshold level of 17% proved to be acceptable for removal of phase discontinuities and hence it was used in subsequent studies. Quantitative analysis of the performance of different phase unwrapping approaches showed that the 3D approach is the most effective in resolving phase discontinuities present in field maps. The application of axial orientation, highest resolution data, absence of compensation flow and the introduction of higher order shim coils showed a significant reduction of B0 inhomogeneities when applied. Conclusions: This project established optimal acquisition parameters and post-processing options to improve the homogeneity of B0, and will aid the validation process in further follow-up studies.
Stanton, Ian Nicholas. "Synthesis, Characterization, and Spectroscopy of Lanthanide-Doped Inorganic Nanocrystals; Radiant Flux and Absolute Quantum Yield Measurements of Upconversion Nanocrystals, and Fabrication of a Fiber-Optic Radiation Detector Utilizing Synthetically Optimized, Linearly Responsive Nanoscintillators." Diss., 2013. http://hdl.handle.net/10161/8261.
Повний текст джерелаThe ability to interrogate structure-function photophysical properties on lanthanide-doped nanoscale materials will define their utility in next-generation applications and devices that capitalize on their size, light-conversion efficiencies, emissive wavelengths, syntheses, and environmental stabilities. The two main topics of this dissertation are (i) the interrogation of laser power-dependent quantum yield and total radiant flux metrics for a homogeneous, solution phase upconversion nanocrystal composition under both continuous wave and femtosecond-pulsed excitation utilizing a custom engineered absolute measurement system, and (ii) the synthesis, characterization, and power-dependent x-ray excited scintillation properties of [Y2O3; Eu] nanocrystals, and their integration into a fiber-optic radiation sensing device capable of in vivo dosimetry.
Presented herein is the laser power-dependent total radiant flux and absolute quantum yield measurements of homogeneous, solution-phase [NaYF4; Yb (15%), Er (2%)] upconversion nanocrystals, and further compares the quantitative total radiant flux and absolute quantum yield measurements under both 970 nm continuous-wave and 976 nm pulsed Ti-Sapphire laser excitation (140 fs pulse-width, 80 MHz). This study demonstrates that at comparable excitation densities under continuous-wave and fs-pulsed excitation from 42 - 284 W/cm
Also presented is the development and characterization of a scintillating nanocrystalline composition, [Y2-xO3; Eux, Liy], in which Eu and Li dopant ion concentrations were systematically varied in order to define the most emissive compositions under specific x-ray excitation conditions. It is shown that these optimized [Y2-xO3; Eux, Liy] compositions display scintillation responses that: (i) correlate linearly with incident radiation exposure at x-ray energies spanning from 40 - 220 kVp, and (ii) manifest no evidence of scintillation intensity saturation at the highest evaluated radiation exposures [up to 4 Roentgen per second]. X-ray excitation energies of 40, 120, and 220 kVp were chosen to probe the dependence of the integrated emission intensity upon x-ray exposure-rate in energy regimes where either the photoelectric or the Compton effect governs the scintillation mechanism on the most emissive [Y2-xO3; Eux, Liy] composition, [Y1.9O3; Eu0.1, Li0.16]. These experiments demonstrate for nanoscale [Y2-xO3; Eux], that for comparable radiation exposures, when scintillation is governed by the photoelectric effect (120 kVp excitation), greater integrated emission intensities are recorded relative to excitation energies where the Compton effect regulates scintillation (220 kVp excitation).
The nanoscale [Y1.9O3; Eu0.1, Li0.16] was further exploited as a detector material in a prototype fiber-optic radiation sensor. The scintillation intensity from a [Y1.9O3; Eu0.1, Li0.16]-modified optical fiber tip, recorded using a CCD-photodetector or a Si-photodiode, was correlated with radiation exposure using a Precision XRAD 225Cx small-animal image guided radiation therapy (IGRT) system, an orthovoltage cabinet-irradiator, and a clinical X-ray Computed Tomography (CT) machine. For all x-ray energies tested from 80 - 225 kVp, this near-radiotransparent device recorded scintillation intensities that tracked linearly with total radiation exposure, highlighting its capability to provide alternately accurate dosimetry measurements for both diagnostic imaging and radiation therapy treatment. Because Si-based CCD and photodiode detectors manifest maximal sensitivities over the emission range of nanoscale [Y1.9O3; Eu0.1, Li0.16], the timing speeds, sizes, and low power-consumption of these devices, coupled with the detection element's linear dependence of scintillation intensity with radiation dose, demonstrates the opportunity for next-generation radiation exposure measuring devices for in/ex vivo applications that are ultra-small, inexpensive, and accurate.
Dissertation
Klimke, Katja [Verfasser]. "Optimised polyolefin branch quantification by 13C NMR spectroscopy / Katja Klimke." 2006. http://d-nb.info/980845998/34.
Повний текст джерелаLuciano, Nicola. "An optimized hybrid data reduction strategy in 1D Raman/Rayleigh spectroscopic measurements of turbulent flames." Phd thesis, 2020. https://tuprints.ulb.tu-darmstadt.de/11432/1/PhD_Thesis_Nicola_Luciano.pdf.
Повний текст джерелаWong, Sherman. "Optimised indentation conditions for large-area phase transformations in Silicon." Master's thesis, 2014. http://hdl.handle.net/1885/149995.
Повний текст джерелаJacob, Desmond. "Design and Optimize a Two Color Fourier Domain Pump Probe Optical Coherence Tomography System." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-796.
Повний текст джерелаLaventure, Audrey. "Caractérisation de matériaux moléculaires amorphes pour optimiser leur préparation et leurs applications." Thèse, 2017. http://hdl.handle.net/1866/19033.
Повний текст джерелаAmorphous molecular materials, also known as molecular glasses, are small organic molecules capable of being organized in a disordered manner. In addition to sharing some of the useful properties of polymers, they offer additional advantages because they are isomolecular species for which synthesis, purification and processing are facilitated by a relatively low viscosity. However, the usually demanding preparation conditions of these materials and their limited functional lifetime due to their tendency to relax to the crystalline state remain obstacles to their use for certain applications, e.g. opto-electronics, nanolithography, pharmaceuticals. The development of strategies to facilitate the preparation of the vitreous phase and avoid its crystallization is therefore essential for the design of functional amorphous molecular materials. The main objective of this thesis is to establish relationships between the molecular structure of molecular glasses and their properties. To achieve it, various libraries of model compounds, analogues of triazine derivatives that have demonstrated excellent glass-forming ability, are used to i) determine the influence of the nature and the position of the groups on the triazine; ii) explore the influence of hydrogen (H) bonds on the properties of glasses when their structure includes functional groups known to facilitate crystallization and when their preparation conditions are similar to those used in industry; and iii) exploit the amorphous phase in order to study the photoresponsiveness of azobenzenes (azo) in order to optimize their use in different applications. The influence of the various substituent groups on the triazine (headgroup, ancillary and linkers) on the glass-forming ability (GFA), the kinetic glass stability (GS) and the glass transition temperature (Tg) of the compounds is first studied. A classification system based on differential scanning calorimetry (DSC) and variable temperature infrared spectroscopy (IR) measurements combined to chemometrics analyses facilitate the rationalization of the roles played by each group. The impact of the H-bonds, the energy of the rotation barrier, and the steric hindrance of the groups is determined, leading to the conclusion that the headgroup is the most influential group and that the presence of H-bonds is not essential to the GFA, but important to obtain a high Tg. The influence of the H-bonds on the properties of glasses approaching those exploited in industry is then explored. Variable temperature IR spectroscopy measurements, DSC studies, and single crystal structure resolution have led to the conclusion that H-bonds impede the crystallization of the compounds even though they are simultaneously functionalized with moieties that promote crystallization (π-π stacking between fluorinated and non-fluorinated stilbene groups). In addition, three similar compounds functionalized with a headgroup presenting a decreasing capability to establish H-bonds (donor, acceptor, none) were vapor-deposited (PVD), a technique used, among others, in the opto-electronic industry, to evaluate their capability to form ultrastable glasses. These PVD glasses all show properties that are similar to those previously reported for ultrastable glasses, including higher density and anisotropy, and are all more kinetically stable than glasses prepared by cooling from the viscous state. However, the PVD glasses prepared with a H-bond donor headgroup are less stable than the others by at least an order of magnitude, suggesting that H-bonds limit the level of kinetic stability achievable by PVD. Finally, a triazine molecular glass functionalized with an azo group is used to study, from a molecular point of view, the perturbations caused by the photoisomerization of the azo. A new IR spectroscopy method was developed to observe a molecular environment gradient along the molecule during photoisomerization, making it possible to support certain hypotheses concerning the resulting macroscopic transport of the material. Triazine-based molecular glass blends are also used as an ideal platform for decoupling the influence of Tg and azo content on the azo photo-orientation, but also on the inscription kinetics and the diffraction efficiency of surface relief gratings (SRGs). This work enables the determination of an optimal Tg range for the inscription of SRGs. Altogether, these new insights will lead to a more rational design of new molecular glasses, which can extend to other amorphous molecular materials.