Готові списки джерел за темами / Spectral Stabilization

Добірка наукової літератури з теми "Spectral Stabilization"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Spectral Stabilization"

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Heinrichs, Wilhelm. "Stabilization techniques for spectral methods." Journal of Scientific Computing 6, no. 1 (March 1991): 1–19. http://dx.doi.org/10.1007/bf01068121.

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2

Jenaliyev, Muvasharkhan, Kanzharbek Imanberdiyev, Arnay Kassymbekova, and Kadyrbek Sharipov. "STABILIZATION OF SOLUTIONS OF TWO-DIMENSIONAL PARABOLIC EQUATIONS AND RELATED SPECTRAL PROBLEMS." Eurasian Mathematical Journal 11, no. 1 (2020): 72–85. http://dx.doi.org/10.32523/2077-9879-2020-11-1-72-85.

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3

Julsgaard, B., A. Walther, S. Kröll, and L. Rippe. "Understanding laser stabilization using spectral hole burning." Optics Express 15, no. 18 (2007): 11444. http://dx.doi.org/10.1364/oe.15.011444.

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4

Fischer, Paul, and Julia Mullen. "Filter-based stabilization of spectral element methods." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 332, no. 3 (February 2001): 265–70. http://dx.doi.org/10.1016/s0764-4442(00)01763-8.

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5

Caccamo, Maria Teresa, and Salvatore Magazù. "Stabilization Effects Induced by Trehalose on Creatine Aqueous Solutions Investigated by Infrared Spectroscopy." Molecules 27, no. 19 (September 24, 2022): 6310. http://dx.doi.org/10.3390/molecules27196310.

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Creatine is a very popular amino acid widely utilized in the sports world due to its functions mainly related to muscle building and increasing performance. The present work investigates the behavior of creatine aqueous solutions and of creatine aqueous in the presence of trehalose as a function of time changes by means of Infrared spectroscopy. Infrared spectra have been gathered and studied over time for both the full spectrum and the intramolecular OH-stretching region for the two mixtures. This latter region was studied more specifically using a cutting-edge technique called Spectral Distance (SD). From this analysis of the spectral features of the investigated samples, it emerges that trehalose has a significant stabilizing effect on creatine aqueous solutions.
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Tsuge, Akira, Yoshinori Uwamino, and Toshio Ishizuka. "Applications of Laser-Induced Thermal Emission Spectroscopy to Various Samples." Applied Spectroscopy 43, no. 7 (September 1989): 1145–49. http://dx.doi.org/10.1366/0003702894203598.

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The Laser-Induced Thermal Emission (LITE) spectra of several solid samples were measured and compared with the usual thermal emission spectra generated by the heating element. The following advantages in LITE spectroscopy were made clear: (1) the spectral background is reduced; (2) the time required for the stabilization of the thermal emission signal is short; (3) the compounds which are coated on background materials with complex shapes can be measured.
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7

Van Vliet, Bruce N., Francesca Belforti, and Jean-Pierre Montani. "Baroreflex stabilization of the double (pressure-rate) product at 0.05 Hz in conscious rabbits." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 282, no. 6 (June 1, 2002): R1746—R1753. http://dx.doi.org/10.1152/ajpregu.00529.2001.

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The product of heart rate (HR) and systolic blood pressure (SBP), the double product (DP), is an indirect index of cardiac oxygen consumption. We used spectral analysis to test the hypothesis that baroreflex adjustments of HR stabilize the DP during spontaneous variations in SBP. SBP and HR were recorded by telemetry in five male conscious rabbits. HR and SBP power spectra each exhibited a low frequency peak at ∼0.05 Hz that was associated with high (>0.5) spectral coherence and a positive phase relationship between SBP and HR (SBP leading). A prominent peak was absent in the spectra of their product, suggesting that SBP and HR interacted to reduce DP variability in this frequency region. In contrast, a prominent 0.05-Hz peak was present in the power spectrum of calculated surrogates of the DP in which reflex interactions between HR and SBP had been removed. Our results suggest that baroreflex adjustments of HR stabilize the DP during spontaneous low-frequency variations in SBP in conscious rabbits.
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8

WATANABE, Keiji, and Mitsuyoshi YAMATARI. "Stabilization of Repetitive Control Systems-Spectral Decomposition Approach." Transactions of the Society of Instrument and Control Engineers 22, no. 5 (1986): 535–41. http://dx.doi.org/10.9746/sicetr1965.22.535.

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Strickland, N. M., P. B. Sellin, Y. Sun, J. L. Carlsten, and R. L. Cone. "Laser frequency stabilization using regenerative spectral hole burning." Physical Review B 62, no. 3 (July 15, 2000): 1473–76. http://dx.doi.org/10.1103/physrevb.62.1473.

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10

Wendisch, Manfred, Dörthe Müller, Dieter Schell, and Jost Heintzenberg. "An Airborne Spectral Albedometer with Active Horizontal Stabilization." Journal of Atmospheric and Oceanic Technology 18, no. 11 (November 2001): 1856–66. http://dx.doi.org/10.1175/1520-0426(2001)018<1856:aasawa>2.0.co;2.

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Дисертації з теми "Spectral Stabilization"

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Marras, Simone. "Variational multiscale stabilization of finite and spectral elements for dry and moist atmospheric problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/112755.

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In this thesis the finite and spectral element methods (FEM and SEM, respectively) applied to problems in atmospheric simulations are explored through the common thread of Variational Multiscale Stabilization (VMS). This effort is justified by three main reasons. (i) the recognized need for new solvers that can efficiently execute on massively parallel architectures ¿a spreading framework in most fields of computational physics in which numerical weather prediction (NWP) occupies a prominent position. Element-based methods (e.g. FEM, SEM, discontinuous Galerkin) have important advantages in parallel code development; (ii) the inherent flexibility of these methods with respect to the geometry of the grid makes them a great candidate for dynamically adaptive atmospheric codes; and (iii) the localized diffusion provided by VMS represents an improvement in the accurate solution of multi-physics problems where artificial diffusion may fail. Its application to atmospheric simulations is a novel approach within a field of research that is still open. First, FEM and VMS are described and derived for the solution of stratified low Mach number flows in the context of dry atmospheric dynamics. The validity of the method to simulate stratified flows is assessed using standard two- and three-dimensional benchmarks accepted by NWP practitioners. The problems include thermal and gravity driven simulations. It will be shown that stability is retained in the regimes of interest and a numerical comparison against results from the the literature will be discussed. Second, the ability of VMS to stabilize the FEM solution of advection-dominated problems (i.e. Euler and transport equations) is taken further by the implementation of VMS as a stabilizing tool for high-order spectral elements with advection-diffusion problems. To the author¿s knowledge, this is an original contribution to the literature of high order spectral elements involved with transport in the atmosphere. The problem of monotonicity-preserving high order methods is addressed by combining VMS-stabilized SEM with a discontinuity capturing technique. This is an alternative to classical filters to treat the Gibbs oscillations that characterize high-order schemes. To conclude, a microphysics scheme is implemented within the finite element Euler solver, as a first step toward realistic atmospheric simulations. Kessler microphysics is used to simulate the formation of warm, precipitating clouds. This last part combines the solution of the Euler equations for stratified flows with the solution of a system of transport equations for three classes of water: water vapor, cloud water, and rain. The method is verified using idealized two- and three-dimensional storm simulations.
En esta tesis los métodos de elementos finitos y espectrales (FEM - finite element method y SEM- spectral element method, respectivamente), aplicados a los problemas de simulaciones atmosféricas, se exploran a través del método de estabilización conocidocomo Variational Multiscale Stabilization (VMS). Tres razones fundamentales justifican este esfuerzo: (i) la necesidad de tener nuevos métodos de solución de las ecuaciones diferenciales a las derivadas parciales usando máquinas paralelas de gran escala –un entorno en expansión en muchos campos de la mecánica computacional, dentro de la cual la predicción numérica de la dinámica atmosférica (NWP-numerical weather prediction)representa una aplicación importante. Métodos del tipo basado en elementos(por ejemplo, FEM, SEM, Galerkin discontinuo) presentan grandes ventajas en el desarrollo de códigos paralelos; (ii) la flexibilidad intrínseca de tales métodos respecto a lageometría de la malla computacional hace que esos métodos sean los candidatos ideales para códigos atmosféricos con mallas adaptativas; y (iii) la difusión localizada que VMSintroduce representa una mejora en las soluciones de problemas con física compleja en los cuales la difusión artificial clásica no funcionaría. La aplicación de FEM o SEM con VMS a problemas de simulaciones atmosféricas es una estrategia innovadora en un campo de investigación abierto. En primera instancia, FEM y VMS vienen descritos y derivados para la solución de flujos estratificados a bajo número de Mach en el contexto de la dinámica atmosférica. La validez del método para simular flujos estratificados es verificada por medio de test estándar aceptado por la comunidad dentro del campo deNWP. Los test incluyen simulaciones de flujos térmicos con efectos de gravedad. Se demostrará que la estabilidad del método numérico se preserva dentro de los regímenesde interés y se discutirá una comparación numérica de los resultados frente a aquellos hallados en la literatura. En segunda instancia, la capacidad de VMS para estabilizarmétodos FEM en problemas de advección dominante (i.e. ecuaciones de Euler y ecuaciones de transporte) se implementa además en la solución a elementos espectrales de alto orden en problemas de advección-difusión. Hasta donde el autor sabe, esta es una contribución original a la literatura de métodos basados en elementos espectrales en problemas de transporte atmosférico. El problema de monotonicidad con métodos de alto orden es tratado mediante la combinación de SEM+VMS con una técnica de shockcapturing para un mejor tratamiento de las discontinuidades. Esta es una alternativa a los filtros que normalmente se aplican a SEM para eilminar las oscilaciones de Gibbsque caracterizan las soluciones de alto orden. Como último punto, se implementa un esquema de humedad acoplado con el núcleo en elementos finitos; este es un primer paso hacia simulaciones atmosféricas más realistas. La microfísica de Kessler se emplea para simular la formación de nubes y tormentas cálidas (warm clouds: no permite la formación de hielo). Esta última parte combina la solución de las ecuaciones de Eulerpara atmósferas estratificadas con la solución de un sistema de ecuaciones de transporte de tres estados de agua: vapor, nubes y lluvia. La calidad del método es verificadautilizando simulaciones de tormenta en dos y tres dimensiones.
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2

Padgett, Miles John. "Techniques for ultra-high resolution saturation spectroscopy and laser stabilization in the 10#mu#m spectral region." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305843.

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3

MIRIGALDI, ALESSANDRO. "Power scaling of high power lasersystems." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2966325.

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4

Venet, Caroline. "Développement d’un filtre spectral ultra résolu pour l’imagerie acousto-optique." Thesis, Paris Sciences et Lettres (ComUE), 2019. https://pastel.archives-ouvertes.fr/tel-02929318.

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Анотація:
L'imagerie médicale optique est limitée par la perte de résolution spatiale due à la diffusion des tissus biologiques. L'imagerie acousto-optique permet de palier à ce problème car elle utilise à la fois de lumière et des ondes ultrasonores. Par conséquent elle donne accès au contraste optique local en profondeur dans les tissus biologiques avec la résolution submillimétrique des ultrasons. Diverses méthodes interférométriques ont été développées pour détecter le signal acousto-optique, mais elles ne sont pas adaptées à l'imagerie in vivo. Au cours de cette thèse nous avons développé un filtre spectral intrinsèquement robuste à une mise en œuvre in vivo et capable de filtrer le signal de photons marqués. Ce filtre est basé sur le phénomène de creusement spectral, il est réalisé dans un cristal de grenat d'yttrium aluminium dopé au thulium (Tm:YAG) sous champ magnétique. Le manuscrit décrit d'abord la caractérisation du filtre spectral en condition d'imagerie. Ensuite nous présentons le montage expérimental qui a permis d' imager un gel diffusant simulant un tissu biologique. Dans la suite nous avons changé le laser principal et nous l'avons asservi en fréquence dans le but d'augmenter le niveau de maturation de la technologie. Enfin, la dernière partie du manuscrit détaille comment l'expérience a été compactée pour être apportée à un laboratoire pharmaceutique afin de lancer une campagne d'imagerie in vivo
Optical imaging for Medicine is limited by the spatial resolution loss due to light scattering in turbid media. A hybrid imaging method called ultrasound optical tomography can overcome this botteneck. Indeed the simultaneous use of light and ultrasound gives access to optical contrast in depth within scattering medium with the ultrasounds resolution. Several interferometric methods have been developed in order to detect an acousto-optic signal. However, none of them is adapted to in vivo imaging. For this reason a filter created with spectral hole burning is of special interest. This thesis presents the development of an ultra-narrow filter based on spectral hole burning in a thulium doped yttrium aluminum garnet crystal (Tm:YAG) under magnetic field. The first part of the manuscript describes the characterization of the filter in the imaging setup. Next, the actual imaging of a scattering gel is described. The following part presents the change of the main laser and its frequency stabilization for technological maturation. The last part of the manuscript details how the experiment have been compacted to be bring in a pharmacetical laboratory in order to launch in vivo imaging trials
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5

Issa, Ibtissam. "Some results on the stabilization of elastic/viscoelastic transmission problems with Kelvin-Voigt or fractional Kelvin-Voigt damping." Thesis, Aix-Marseille, 2021. http://theses.univ-amu.fr.lama.univ-amu.fr/211207_ISSA_690cu840ucxbzr880kpmyt859oe_TH.pdf.

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Cette thèse est consacrée à l'étude de la stabilisation de certains systèmes localement couplés. Tout d'abord, nous étudions la stabilité d'équations d'onde couplées unidimensionnelles avec deux amortissements visqueux intérieurs non lisses où nous établissons une stabilité exponentielle. Dans un second temps, nous étudions la stabilisation d'équations d'onde localement couplées avec un seul amortissement viscoélastique interne de type Kelvin-Voigt. L'amortissement et les coefficients de couplage ne sont pas lisses. En utilisant une approche spectrale, nous démontrons la stabilité non uniforme du système. Ensuite, en utilisant une approche dans le domaine fréquentiel, combinée à une technique de multiplicateur par morceaux et à la construction d'un nouveau multiplicateur satisfaisant quelques équations différentielles ordinaires, nous montrons que l'énergie de la solution lisse du système décroît polynomiale. Troisièmement, nous étudions la décroissance énergétique de systèmes hyperboliques de type onde-onde, onde-Euler Bernoulli et faisceau-faisceau. En effet, les deux équations sont couplées par liaison limite avec un seul amortissement fractionnaire Kelvin Voigt localisé non lisse. Nous établissons un taux de décroissance d'énergie polynomial. Enfin, nous étudions la stabilité d'un système multidimensionnel de deux équations d'onde couplées par des vitesses avec un seul amortissement Kelvin-Voigt localisé non lisse. En utilisant une analyse spectrale, nous prouvons la stabilité non uniforme du système. Nous établissons des résultats de stabilité polynomiale en considérant différentes conditions géométriques sur les domaines de couplage et d'amortissement
This thesis is devoted to study the stabilization of some locally coupled systems. First, we study the stability of a one-dimensional coupled wave equations with two interior non smooth viscous dampings where we establish exponential stability. Second, we study the stabilization of a locally coupled wave equations with only one internal viscoelastic damping of Kelvin-Voigt type. Both the damping and the coupling coefficients are non smooth. Using a spectrum approach, we prove the non-uniform stability of the system. Next, using a frequency domain approach, combined with a piecewise multiplier technique and the construction of a new multiplier satisfying some ordinary differential equations, we show that the energy of the smooth solution of the system decays polynomially. Third, we investigate the energy decay of hyperbolic systems of wave-wave, wave-Euler Bernoulli beam and beam-beam types. Indeed, the two equations are coupled through boundary connection with only one localized non smooth fractional Kelvin Voigt damping. We establish a polynomial energy decay rate. Finally, we study the stability of a multidimensional system of two wave equations coupled by velocities with only one localized non-smooth Kelvin-Voigt damping. By using a spectral analysis, we prove the non uniform stability of the system. Further, using a frequency domain approach combined with a multiplier technique, we establish some polynomial stability results by considering different geometric conditions on the coupling and the damping domains. In addition, in the absence of any geometric condition, we establish two polynomial energy decay rates of the system on a square domain
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6

Golinelli, Anna. "Development of an original 10 kHz Ti : Sa regenerative cavity allowing 17 fs CEP stable 1 kHz TW-class amplification or wavelength tunability." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS018.

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Au cours de dix dernières années la science aux attoseconde ou Physique au champ-fort a été l’objet d’un fort développement. La production d’impulsions laser énergétiques de courte durée à haute cadence et stabilisées en CEP constitue la première étape pour accéder aux dynamiques ultra-rapides caractérisant l’interaction de la matière avec une source de lumière cohérente, intense et ultra-rapide. Le travail de cette thèse consiste à améliorer globalement les performances d’un système laser Ti:Sa à haute cadence optimisé pour la génération des impulsions attoseconde. Nous avons développé une nouvelle configuration de cavité régénérative fonctionnant à 10 kHz qui permet une meilleure gestion des effets thermiques dans le cristal. En sortie de l’amplificateur les impulsions atteignent des valeurs de puissance de 5 W en bande étroite (35 fs), ou 2.7 W en bande spectrale large permettant une compression des impulsions proche de 17 fs. La CEP des impulsions en sortie d’amplificateur a été stabilisée ; le bruit résiduel mesuré tir-à-tir est de 210 mrad pendant trois heures.L’amplificateur peut supporter également le fonctionnement en mode accordable, en sélectionnant des spectres de 30 à 40 nm de largeur à mi-hauteur et en accordant leur longueur d’onde centrale dans une gamme de 80 nm autour de 800 nm. Nous avons conçu et mis en fonctionnement un amplificateur multi-passages non-cryogéné à imagerie par lentille thermique pour accroître la puissance des impulsions jusqu’à 10 W à une cadence de 1 kHz. Le régime de forte saturation d’amplificateur garantit une variation négligeable (±3% pic à pic) de la puissance des impulsions en sortie du module, face à une variation importante de la puissance en entrée (±25% pic à pic) sur la bande spectrale accordable. L’amplification peut encore être plus importante grâce à une ligne d’amplification à refroidissement cryogénique, qui permet d’atteindre des puissances au niveau TW, à la cadence de 1 kHz, tout en maintenant un régime de courte durée (17.5 fs) et stabilité en CEP (350 mrad de bruit résiduel tir-à-tir). Nous proposons aussi une étude des sources de bruit de CEP dans les modules hautement dispersifs: nous avons conçu une nouvelle approche numérique sur la base d’un logiciel de tracé de rayon commercial (Zemax) pour évaluer les variations de CEP dans les modules contenant réseaux de diffraction
The last decade has seen a lot of progress in attosecond science or in strong field physics. Generating energetic, few-cycle laser pulses with stabilized Carrier-Envelope Phase at high repetition rate constitutes the first step to access the ultra-fast dynamics underlying the interaction of matter with intense, ultrashort coherent light source. The work of this thesis consists in globally improving the performances of a high repetition rate Ti:Sa laser system optimized for attosecond science. We present an original 10 kHz Ti:Sa CPA laser based on an newlydesigneddouble-crystal cavity for thermal lensing management. The amplifier delivers up to 5 W in narrow band mode (35 fs pulses), or 2.7 W in broad band mode, supporting 17 fs pulses after temporal compression. We demonstrate shot-to-shot CEP stabilization with a remaining noise of 210 mrad over three hours at the front-end output. In parallel to the short pulse duration operation mode, it is possible to use the front end in a wavelength tunability mode within a 80 nm range around 800 nm, with a resolution of 1 nm and 30 to 40 nm of bandwidth. We designed and demonstrated a complete water-cooled lens-less multipass amplifier using thermal lensing for modeadaptation boosting the pulse energy up to 10mJ at 1 kHz repetition rate (up to 10 W). The saturation regime of the amplifier ensures negligible variation (±3% peak to peak) of the output power for significant variation of the input power (±25% peak to peak) over the tunability range. The energy scalability of the front-end is demonstrated by coupling its output to cryogenically cooled amplifier, delivering 1 kHz, TW-class pulses at 17.5 fs and CEP stabilized with a residual noise of 350 mrad. A study of CEP noise sources in high dispersive module is also addressed, proposing a numerical approach based on a commercial ray-tracing software (Zemax) for predicting CEP fluctuation in grating based modules
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Schmidt, Florian. "Laser-based Absorption Spectrometry : Development of NICE-OHMS Towards Ultra-sensitive Trace Species Detection." Doctoral thesis, Umeå : Department of Physics, Umeå Univ, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1414.

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8

Sahni, Mohamed Omar. "Contribution à l'étude de techniques pour l'affinement spectral de lasers : application aux diodes à blocage de modes destinées aux télécommunications optiques cohérentes." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S121/document.

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Анотація:
Les peignes de fréquences optiques, issus de diodes à blocage de modes, font partie des candidats potentiels pour les réseaux de transmission à multiplexage en longueurs d’onde (WDM). Cependant, les modes composant leur peigne, exhibent généralement des largeurs de raie optiques relativement élevées ( 1-100 MHz), rendant ainsi incompatible leur utilisation sur un réseau WDM employant des formats de modulation avancés d’ordre supérieur. Cette thèse étudie, une solution pour palier à cette limitation. La technique utilisée, dite d’asservissement à correction aval hétérodyne, effectue un traitement du flux lumineux en sortie du laser sans agir sur ce dernier, permettant de réduire le bruit de fréquence présent sur chacune des raies et par conséquent leur largeur de raie optique. Dans une première approche, la technique est appliquée à un laser mono-fréquence. Cela a permis d’une part de valider son fonctionnement et d’autre part d’identifier les limites intrinsèques du dispositif expérimental mis en place. Ainsi, nous démontrons que le niveau de bruit de fréquence minimum permis par notre système, correspond à un spectre optique de largeur de raie optique instantanée de 50 Hz et une largeur de raie de 1,6 kHz pour un temps d’observation de 10 ms. La technique est par la suite appliquée à une diode à blocage de modes actif. Le peigne de fréquences optiques ainsi généré, est composé de 21 modes, ayant tous une largeur de raie optique intrinsèque inférieure à 7 kHz, dont 9 modes sont sub-kHz. Pour un temps d’observation du spectre optique de 10 ms, ces modes exhibent tous une largeur de raie d’environ 37 kHz. Nous démontrons ainsi l’impact de la gigue d’impulsions sur les performances de la technique et nous soulignons l’intérêt d’une telle cohérence, pour le domaine des télécommunications optiques cohérentes (transmissions WDM cohérentes de type m-QAM avec des constellations d’ordre élevé, compatibles avec des débits multi-Tbit/s par raie). En dernier lieu, nous abordons une seconde technique consistant à pré-stabiliser la fréquence d’un laser par asservissement en boucle fermée. Elle repose sur l’utilisation d’un interféromètre à fibre déséquilibré comme référence pour réduire le bruit de fréquence d’un laser, situé particulièrement en basses fréquences. Appliquée à un laser mono-fréquence, elle a permis de réduire son bruit de fréquence technique conduisant ainsi à une nette amélioration de sa largeur de raie intégrée sur 3 ms, de 224 kHz à 37 kHz. Ce premier résultat représente un bon support vers l’exploration du potentiel des diodes à blocage de modes pour des applications métrologiques
Optical frequency combs obtained from mode-locked laser diodes are potential candidates for WDM networks. However, their lines exhibit usually a broad optical linewidth ( 1-100 MHz). Thus their use is incompatible for high order modulation formats WDM based systems. This thesis investigates one solution to overcome this limitation. It consists of using a feed-forward heterodyne technique to reduce the frequency noise of each comb-line and consequently their optical linewidths. In a first approach, the technique is applied to a single-mode laser. This allowed us to validate its proper working and to identify the intrinsic limits of the experimental device set up. The latter analysis enabled us to reveal that the minimum achievable frequency noise level by our system, corresponds to a 50 Hz intrinsic optical linewidth spectrum and a 1,6 kHz optical linewidth based on 10 ms observation time. This technique is then applied to an actively mode-locked laser diode demonstrating, at our system output, a 21-line optical frequency comb with intrinsic optical linewidths reduced to below 7 kHz. It is worth noting that 9 among them, exhibit sub-kHz linewidths. For an observation time of 10 ms, all lines share the same optical linewidth, almost equal to 37 kHz. We thus show that the timing jitter impacts the technique performances. We also highlight the relevance of such coherence level for coherent optical communication. Lastly, we study a laser frequency pre-stabilization technique based on a locking to an unbalanced fiber interferometer. When applied to a single-mode laser, the technique showed a reduction of its technical frequency noise, thus leading to a clear improvement of its integrated optical linewidth from 224 kHz to 37 kHz for 3 ms observation time. This first result provides a good support towards the exploration of mode-locked laser diodes potential for metrological applications
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9

Klein, Guillaume. "Stabilisation et asymptotique spectrale de l’équation des ondes amorties vectorielle." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD050/document.

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Dans cette thèse nous considérons l’équation des ondes amorties vectorielle sur une variété riemannienne compacte, lisse et sans bord. L’amortisseur est ici une fonction lisse allant de la variété dans l’espace des matrices hermitiennes de taille n. Les solutions de cette équation sont donc à valeurs vectorielles. Nous commençons dans un premier temps par calculer le meilleur taux de décroissance exponentiel de l’énergie en fonction du terme d’amortissement. Ceci nous permet d’obtenir une condition nécessaire et suffisante la stabilisation forte de l’équation des ondes amorties vectorielle. Nous mettons aussi en évidence l’apparition d’un phénomène de sur-amortissement haute fréquence qui n’existait pas dans le cas scalaire. Dans un second temps nous nous intéressons à la répartition asymptotique des fréquences propres de l’équation des ondes amorties vectorielle. Nous démontrons que, à un sous ensemble de densité nulle près, l’ensemble des fréquences propres est contenu dans une bande parallèle à l’axe imaginaire. La largeur de cette bande est déterminée par les exposants de Lyapunov d’un système dynamique défini à partir du coefficient d’amortissement
In this thesis we are considering the vectorial damped wave equation on a compact and smooth Riemannian manifold without boundary. The damping term is a smooth function from the manifold to the space of Hermitian matrices of size n. The solutions of this équation are thus vectorial. We start by computing the best exponential energy decay rate of the solutions in terms of the damping term. This allows us to deduce a sufficient and necessary condition for strong stabilization of the vectorial damped wave equation. We also show the appearance of a new phenomenon of high-frequency overdamping that did not exists in the scalar case. In the second half of the thesis we look at the asymptotic distribution of eigenfrequencies of the vectorial damped wave equation. Were show that, up to a null density subset, all the eigenfrequencies are in a strip parallel to the imaginary axis. The width of this strip is determined by the Lyapunov exponents of a dynamical system defined from the damping term
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10

Leeman, Aaron 1974. "Stabilization of chromatic functors." Thesis, University of Oregon, 2009. http://hdl.handle.net/1794/10227.

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vii, 34 p. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.
We study the Bousfield localization functors known as [Special characters omitted], as described in [MahS]. In particular we would like to understand how they interact with suspension and how they stabilize. We prove that suitably connected [Special characters omitted]-acyclic spaces have suspensions which are built out of a particular type n space, which is an unstable analog of the fact that [Special characters omitted]-acyclic spectra are built out of a particular type n spectrum. This theorem follows Dror-Farjoun's proof in the case n = 1 with suitable alterations. We also show that [Special characters omitted] applied to a space stabilizes in a suitable way to [Special characters omitted] applied to the corresponding suspension spectrum.
Committee in charge: Hal Sadofsky, Chairperson, Mathematics; Arkady Berenstein, Member, Mathematics; Daniel Dugger, Member, Mathematics; Dev Sinha, Member, Mathematics; William Rossi, Outside Member, English
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Книги з теми "Spectral Stabilization"

1

Kondo, Motohiko. Stabilization of rice culture under water stress in the tropics using a broader spectrum of genetic resources. Tsukuba, Japan: Japan International Research Center for Agricultural Sciences, 2004.

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2

Polites, Michael E. A general-purpose balloon-borne pointing system for solar scientific instruments. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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3

Polites, Michael E. A general-purpose balloon-borne pointing system for solar scientific instruments. Huntsville, Ala: George C. Marshall Space Flight Center, 1990.

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4

Polites, Michael E. A general-purpose balloon-borne pointing system for solar scientific instruments. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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5

Rajeev, S. G. Fluid Mechanics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805021.001.0001.

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Starting with a review of vector fields and their integral curves, the book presents the basic equations of the subject: Euler and Navier–Stokes. Some solutions are studied next: ideal flows using conformal transformations, viscous flows such as Couette and Stokes flow around a sphere, shocks in the Burgers equation. Prandtl’s boundary layer theory and the Blasius solution are presented. Rayleigh–Taylor instability is studied in analogy with the inverted pendulum, with a digression on Kapitza’s stabilization. The possibility of transients in a linearly stable system with a non-normal operator is studied using an example by Trefethen et al. The integrable models (KdV, Hasimoto’s vortex soliton) and their hamiltonian formalism are studied. Delving into deeper mathematics, geodesics on Lie groups are studied: first using the Lie algebra and then using Milnor’s approach to the curvature of the Lie group. Arnold’s deep idea that Euler’s equations are the geodesic equations on the diffeomorphism group is then explained and its curvature calculated. The next three chapters are an introduction to numerical methods: spectral methods based on Chebychev functions for ODEs, their application by Orszag to solve the Orr–Sommerfeld equation, finite difference methods for elementary PDEs, the Magnus formula and its application to geometric integrators for ODEs. Two appendices give an introduction to dynamical systems: Arnold’s cat map, homoclinic points, Smale’s horse shoe, Hausdorff dimension of the invariant set, Aref ’s example of chaotic advection. The last appendix introduces renormalization: Ising model on a Cayley tree and Feigenbaum’s theory of period doubling.
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6

Evans, Charlotte, Anne Creaton, Marcus Kennedy, and Terry Martin, eds. Neonatal retrieval. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198722168.003.0018.

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Infants requiring retrieval at or soon after birth, often present complex medical and retrieval challenges. Many of these infants will require significant stabilization and definitive care prior to transport and all will require careful preparation for potential in-transit deterioration. A wide spectrum of neonatal pathologies will be encountered in the retrieval setting, many of which will remain undifferentiated until further investigation at a receiving centre is performed. This chapter describes the diagnosis, acute resuscitation, and retrieval management of neonates with respiratory, cardiovascular, neurological, surgical, metabolic, and infectious pathologies as well as the approach to the undifferentiated, unwell neonate. Essential neonatal practical procedures are described, including airway procedures and vascular access, and normal laboratory results for neonates are outlined.
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7

van der Ploeg, Ans T., and Pascal Laforêt. Pompe Disease. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199972135.003.0055.

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Pompe disease, also named acid maltase deficiency and glycogen storage disease type II (GSDII), is a rare autosomal recessive disorder caused by the deficiency of the glycogen-degrading lysosomal enzyme acid α‎-glucosidase. The clinical spectrum of this disease is broad, varying from a lethal infantile-onset generalized myopathy including cardiomyopathy, to late-onset slowly progressive muscle weakness mimicking limb-girdle muscular dystrophy. Respiratory insufficiency is a frequent complication and the main cause of death. The prognosis of Pompe disease has changed considerably with the use of enzyme replacement therapy using recombinant acid α‎-glucosidase (alglucosidase alfa), which has been widely available since 2006. Improvements in survival and major motor achievements can be observed in patients with infantile forms, and recent studies demonstrate improvement of walking distance and stabilization of pulmonary function in late-onset forms. A longer-term study of the safety and efficacy of ERT, based on data gathering across the complete spectrum of Pompe disease via national or international patient registries, is needed in order to formulate more precise guidelines for treatment.
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8

Krawatzek, Félix. The Russian Federation after the ‘Colour Revolutions’. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198826842.003.0004.

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The mobilization by young people in the Russian Federation illuminates an important part of the stabilization of the country’s authoritarian regime structures from 2005 to 2011. First the political developments of the episode are contextualized by contrasting the regime’s insecurity in 2005 with the situation by 2011. After discussing the socio-political context of young people during the post-Soviet transition years, the chapter explores the findings from the discourse network analysis. Public discourse and political mobilization interact and the chapter discusses the spectrum of politically involved youth from pro-Kremlin groups to the very diverse opposition, including liberal democratic movements, fascists, and communists. It is argued that the regime’s success in capturing control over youth discourse and young people was critical in the consolidation of Vladimir Putin’s power.
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9

Portillo, Rafael, Luis-Felipe Zanna, Stephen O’Connell, and Richard Peck. Implications of Food Subsistence for Monetary Policy and Inflation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198785811.003.0011.

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The chapter introduces subsistence requirements in food consumption into a simple New Keynesian model with flexible food and sticky non-food prices. It shows how the endogenous structural transformation that results from subsistence affects the dynamics of the economy, the design of monetary policy, and the properties of inflation at different levels of development. A calibrated version of the model encompasses both rich and poor countries and broadly replicates the properties of inflation across the development spectrum, including the dominant role played by changes in the relative price of food in poor countries. The authors derive a welfare-based loss function for the monetary authority and show that optimal policy calls for complete (in some cases near-complete) stabilization of sticky-price non-food inflation, despite the presence of a food-subsistence threshold. Subsistence amplifies the welfare losses of policy mistakes, however, raising the stakes for monetary policy at earlier stages of development.
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10

Johnson, Steven B. Pathophysiology and management of abdominal injury. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0334.

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Abdominal injuries are common following blunt and penetrating trauma. They can result in a spectrum of severity from benign to potentially life-threatening conditions. Soon after injury, haemorrhage is the predominant concern, and leading cause of morbidity and mortality. Active haemorrhage resulting in shock requires emergent operative intervention and aggressive haemostatic resuscitation. However haemodynamically-stable patients benefit from non-operative management of solid organ injuries with or without angiographic embolization. Sepsis usually occurs as a result of intra-abdominal infections from missed bowel perforations or anastomotic leaks. Sterile systemic hyperinflammatory conditions can result from major hepatic necrosis or pancreatic injuries, and closely mimic infectious conditions. Damage control surgery is a valuable adjunct to the operative management of major abdominal trauma. This concept recognizes that the time and procedures required to perform definitive operative repair may be detrimental when physiological derangements are excessive. By limiting operations to controlling haemorrhage and enteric contamination, further deterioration, and the ‘vicious bloody cycle of trauma’ can be avoided. The operative and critical care management of patients with abdominal trauma should be closely integrated to correct physiological derangements with rapid stabilization and reversal of hypoperfusion. Abdominal compartment syndrome, characterized by intra-abdominal hypertension and resultant remote organ dysfunction, is a risk in patients undergoing high-volume fluid resuscitation. Emergent decompressive laparotomy is indicated in patients with abdominal compartment syndrome and results in rapid reversal of physiological compromise. Paramount to optimal management of abdominal injuries is the close integration of operative and critical care approaches.
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Частини книг з теми "Spectral Stabilization"

1

Russell, David L. "Spectral and asymptotic properties of linear elastic systems with internal energy dissipation." In Control of Boundaries and Stabilization, 31–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0043351.

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2

Benner, Peter. "Partial Stabilization of Descriptor Systems Using Spectral Projectors." In Lecture Notes in Electrical Engineering, 55–76. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0602-6_3.

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3

Flory, Simone, Frank Neubrander, and Yu Zhuang. "On the Regularization and Stabilization of Approximation Schemes for C 0-Semigroups." In Partial Differential Equations and Spectral Theory, 119–32. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8231-6_14.

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4

Ohlsson, J., P. Schlatter, P. F. Fischer, and D. S. Henningson. "Stabilization of the Spectral-Element Method in Turbulent Flow Simulations." In Lecture Notes in Computational Science and Engineering, 449–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15337-2_43.

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5

Verduyn Lunel, Sjoerd M. "Spectral Theory for Neutral Delay Equations with Applications to Control and Stabilization." In Mathematical Systems Theory in Biology, Communications, Computation, and Finance, 415–67. New York, NY: Springer New York, 2003. http://dx.doi.org/10.1007/978-0-387-21696-6_15.

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6

Marras, Simone, Andreas Müller, and Francis X. Giraldo. "Physics-Based Stabilization of Spectral Elements for the 3D Euler Equations of Moist Atmospheric Convection." In Lecture Notes in Computational Science and Engineering, 355–63. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19800-2_32.

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7

Casati, G. "Quantum Chaos, Fractal Spectra and Atomic Stabilization." In On Three Levels, 281–88. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2460-1_32.

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8

"1. Spectral Properties of Linear Time-Delay Systems." In Stability and Stabilization of Time-Delay Systems, 3–31. Society for Industrial and Applied Mathematics, 2007. http://dx.doi.org/10.1137/1.9780898718645.ch1.

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9

He, Guang S. "Multiphoton Nonlinear Optical Effects." In Laser Stimulated Scattering and Multiphoton Excitation, 336–404. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192895615.003.0011.

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There is a variety of novel optical materials exhibiting a superior multiphoton reactivity working in appropriate spectral ranges. These materials have been employed to carry out the fundamental research of multiphoton excitation processes, as well as to explore various advanced applications, such as multiphoton excitation-based upconversion lasing, optical power limiting (for protecting human eyes or optical sensors), optical stabilization (for smoothing the intensity spatiotemporal fluctuations), optical reshaping (for reshaping the spatiotemporal structures of the light), optical 3D data storage (with a volume density up to ~ 1012 bits/cm3), and optical 3D microfabrication of the products with a size or structure less than several microns.
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10

"Spectra." In Pharmaceutical Photostability and Stabilization Technology, 111–22. CRC Press, 2006. http://dx.doi.org/10.1201/9781420014136-8.

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Тези доповідей конференцій з теми "Spectral Stabilization"

1

Julsgaard, B., L. Rippe, A. Walther, and S. Kroll. "Understanding laser stabilization using spectral hole burning." In 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/cleoe-iqec.2007.4386334.

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2

Shi, Yan, Yingying Zhang, Xiandong Feng, Haijie Bi, Bingwei Wu, and Yifei Wang. "Study and analysis of gamma spectral drift and spectral stabilization methods." In Second International Conference on Sensors and Information Technology (ICSI 2022), edited by Lijia Pan. SPIE, 2022. http://dx.doi.org/10.1117/12.2637508.

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3

Zhao, Kun. "Comparison of spectral broadening methods in CEP stabilization." In International Symposium on Ultrafast Phenomena and Terahertz Waves. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/isuptw.2018.wd2.

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4

Gao, Yitan, Yangyang Liu, Pei Huang, Siyun Xu, Yujiao Jiang, Ji Wang, Kun Zhao, Shaobo Fang, and Zhiyi Wei. "Comparison of spectral broadening methods in CEP stabilization." In International Symposium on Ultrafast Phenomena and Terahertz Waves. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/isuptw.2018.wi38.

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5

Tannenbaum, Allen. "Spectral Nevanlinna-Pick interpolation theory and robust stabilization." In 26th IEEE Conference on Decision and Control. IEEE, 1987. http://dx.doi.org/10.1109/cdc.1987.272721.

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6

Sellin, P. B., N. M. Strickland, T. Bottger, J. L. Carlsten, and R. L. Cone. "Laser frequency stabilization using regenerative spectral hole burning." In Conference on Lasers and Electro-Optics (CLEO 2000). Technical Digest. Postconference Edition. TOPS Vol.39. IEEE, 2000. http://dx.doi.org/10.1109/cleo.2000.906928.

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7

Rowan, William L., I. O. Bespamyatnov, and R. V. Bravenec. "Shear Stabilization of Turbulence in Tokamaks: An Application for Line Shape Analysis of Impurity Spectra Excited by Interaction with a Hydrogen Neutral Beam." In SPECTRAL LINE SHAPES: 18th International Conference on Spectral Line Shapes. AIP, 2006. http://dx.doi.org/10.1063/1.2402780.

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8

Hartman, M. T., S. Zhang, X. Lin, N. Lucic, N. Galland, R. Le Targat, B. Fang, et al. "Towards Multi-Spectral Hole Probing in Laser Frequency Stabilization." In 2022 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS). IEEE, 2022. http://dx.doi.org/10.1109/eftf/ifcs54560.2022.9850914.

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9

Heinrich, Matthias, Falk Eilenberger, Robert Keil, Felix Dreisow, Eric Suran, Frédéric Louradour, Andreas Tünnermann, Thomas Pertsch, Stefan Nolte, and Alexander Szameit. "Optical limiting and spectral stabilization in segmented photonic lattices." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/cleo_si.2013.ctu3e.5.

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10

Prasad, C. R., C. L. Korb, and G. K. Schwemmer. "Frequency Stabilization of an Alexandrite Laser for Pressure - Temperature Lidar Measurements." In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/orsa.1990.tud18.

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The pressure - temperature differential absorption lidar1-3 utilizes two narrow band tunable pulsed alexandrite lasers. For tuning and narrow band operation, the on-line high resolution laser has three intracavity elements which are a birefringent filter, a tilt tuned thin etalon and a piezoelectrically tuned etalon. To obtain accurate temperature measurements, a line center frequency stability and accuracy of ±0.002 cm-1 is required over an extended period of time, typically ~ 30 min, which corresponds to a set of measurements and in addition the spectral bandwidth of the on-line laser should be less than 0.02 cm-1. A wavemeter consisting of a 5 cm coated Fizeau wedge and a Reticon detector array (with 1024 detector elements spaced at 25 μm) has been developed4 to measure the frequency and spectral line shape of the laser. Typically the output spectrum of the on-line alexandrite laser consists of three longitudinal modes which are spaced about 0.007 cm-1 apart.
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Звіти організацій з теми "Spectral Stabilization"

1

Venus, George, Vadim Smirnov, Leonid Glebov, and Manoj Kanskar. Spectral Stabilization of Laser Diodes by External Bragg Resonator. Fort Belvoir, VA: Defense Technical Information Center, January 2004. http://dx.doi.org/10.21236/ada452556.

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2

Marras, S., J. F. Kelly, F. X. Giraldo, and M. Vazquez. Variational Multiscale Stabilization of High-Order Spectral Elements for the Convection-Diffusion Equation. Fort Belvoir, VA: Defense Technical Information Center, June 2012. http://dx.doi.org/10.21236/ada590018.

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