Bibliografias temáticas / Spectron

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Literatura científica selecionada sobre o tema "Spectron"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 20 de fevereiro de 2023

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Artigos de revistas sobre o assunto "Spectron"

Chekhova, M. V. "Two-photon spectron". Journal of Experimental and Theoretical Physics Letters 75, n.º 5 (março de 2002): 225–26. http://dx.doi.org/10.1134/1.1478518.

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Meigh-Andrews, Chris. "Peter Donebauer, Richard Monkhouse and the Development of the EMS Spectron and the Videokalos Image Processor". Leonardo 40, n.º 5 (outubro de 2007): 463–67. http://dx.doi.org/10.1162/leon.2007.40.5.463.

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The author details the development of two early color video synthesizers, the EMS Spectron and the Videokalos Image Processor, and examines their influence on video-based art. The Spectron, developed by Richard Monkhouse for Electronic Music Studios, influenced both its creator and various artists in the development of video-based art and images. Artist Peter Donebauer collaborated with Monkhouse to produce the Videokalos, leading to several artworks and a series of live performances.

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Gómez, Daniel. "Spectron: Graphical Model for Interacting With Timbre". TecnoLógicas, n.º 22 (27 de junho de 2009): 61. http://dx.doi.org/10.22430/22565337.232.

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Los algoritmos para crear y manipular el sonido por medios electrónicos o digitales han crecido en cantidad y complejidad desde la creación de los primeros sintetizadores análogos. Sin embargo, las técnicas para visualizar estos modelos de síntesis no han crecido a la par de los sintetizadores hardware o software. En este artículo se muestran posibilidades para representar y controlar gráficamente el timbre, basadas en la visualización de los parámetros involucrados en su modelo de síntesis. Un grupo de datos muy simple fue extraído de un sintetizador substractivo comercial y analizado con dos aproximaciones diferentes, reducción dimensional y visualización abstracta de datos. Los resultados de estas aproximaciones diferentes fueron usados como lineamientos para crear un prototipo de sintetizador digital: el sintetizador Spectron. Este prototipo usa el gráfico de Amplitud vs. Frecuencia como su principal herramienta para informar a cerca del timbre e interactuar con el, fue desarrollado en PureData y su control plantea una simplificación en la cantidad de variables de un oscilador clásico al mismo tiempo que expande las posibilidades para generar timbres adicionales a los de estos osciladores clásicos.

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Carlson, Lawrence E., Bob Radocy e Peter D. Marschall. "Spectron 12 Cable for Upper-Limb Prostheses". JPO Journal of Prosthetics and Orthotics 3, n.º 3 (outubro de 1991): 130???141. http://dx.doi.org/10.1097/00008526-199106000-00010.

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Garellick, Göran, Henrik Malchau e Peter Herberts. "The charnley versus the spectron hip prosthesis". Journal of Arthroplasty 14, n.º 4 (junho de 1999): 407–13. http://dx.doi.org/10.1016/s0883-5403(99)90095-5.

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Garellick, Göran, Henrik Malchau, Hans Regnér e Peter Herberts. "The charnley versus the spectron hip prosthesis". Journal of Arthroplasty 14, n.º 4 (junho de 1999): 414–25. http://dx.doi.org/10.1016/s0883-5403(99)90096-7.

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Karapetyan, N., H. Toneyan, A. Kutuzyan, M. Sukiasyan, V. Avetisyan, D. Gulqanyan, K. Apresyan e L. Mouradian. "Numerical Study of Spectron Shaping Process: Phase Peculiarities". Journal of Contemporary Physics (Armenian Academy of Sciences) 53, n.º 2 (abril de 2018): 129–35. http://dx.doi.org/10.3103/s1068337218020044.

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Teeter, Matthew G., Richard W. McCalden, Xunhua Yuan, Steven J. MacDonald e Douglas D. Naudie. "Predictive accuracy of RSA migration thresholds for cemented total hip arthroplasty stem designs". HIP International 28, n.º 4 (20 de maio de 2018): 363–68. http://dx.doi.org/10.1177/1120700018762179.

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Introduction: Radiostereometric analysis (RSA) migration thresholds for cemented total hip stems have been established beyond which an unacceptably high risk of revision is likely to occur. These thresholds are subsidence >0.23 mm or >1.2 mm after 2 years. The purpose of this study was to retrospectively examine after long-term follow-up the predictive accuracy of the two thresholds. Methods: Data from two previous prospective RSA trials with 2 year follow-up for which minimum 10 year survivorship data was available were used. Thirty-six patients received a Spectron stem, 17 patients received an Exeter stem, and 17 patients received a CPCS stem. Subsidence after 2 years was compared to the migration thresholds, and long-term survivorship and clinical outcome scores were obtained. Results: At 2 years, the Spectron stem subsided 0.046 ± 0.160 mm, the Exeter stem subsided 1.218 ± 0.320 mm, and the CPCS stem subsided 0.681 ± 0.246 mm ( p < 0.0001). The Spectron stem passed both thresholds, the Exeter stem failed both thresholds, and the CPCS stem passed 1 and failed 1 threshold. At 10 years, survivorship exceeded 90% for all stems. Conclusion: All stems demonstrated strong 10 year survivorship and equivalent clinical outcome scores, but this success would not have been equally predicted across RSA migration thresholds. Although RSA is a useful predictive tool, care should be taken in applying migration thresholds only to those stem designs they are indicated for, with the threshold of 1.2 mm of subsidence at 2 years being most broadly applicable.

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de Izarra, G., C. Jammes, B. Geslot, J. Di Salvo e C. Destouches. "SPECTRON, a neutron noise measurement system in frequency domain". Review of Scientific Instruments 86, n.º 11 (novembro de 2015): 115111. http://dx.doi.org/10.1063/1.4935250.

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Edwards High Vacuum International. "Modem link trouble shoots remote Spectron 3000 leak detectors". Vacuum 40, n.º 3 (1990): 319–20. http://dx.doi.org/10.1016/0042-207x(90)90054-3.

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Teses / dissertações sobre o assunto "Spectron"

Kumar, Hemant, University of Western Sydney e of Science Technology and Environment College. "Software analytical tool for assessing cardiac blood flow parameters". THESIS_FSTA_XXX_Kumar_H.xml, 2001. http://handle.uws.edu.au:8081/1959.7/392.

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Introduction of Doppler ultrasound techniques into the Intensive Care setting has revolutionised the way haemodynamic status is monitored in the critically ill. However, in order to increase the usefulness of these techniques, the Doppler signal and its spectrum need to be further analysed in ways to facilitate a better clinical response. Extensive processing of the Doppler spectrum on Diagnostic ultrasound machines is limited by the real time performance considerations. It was therefore proposed that the spectral information from these systems be extracted off-line and full set of analytical tools be made available to evaluate this information. This was achieved by creating an integrated and modular software tool called Spectron, which was intended as an aid in the overall management of the patients. The modular nature of Spectron was intended to ensure that new analytical tools and techniques could be easily added and tested. The software provides its users with considerable latitude in choosing various data acquisition and analysis parameters to suit various clinical situations and patient requirements. Spectron was developed under the Windows environment to provide a user friendly interface and to address a range of programming problems such as memory management and the size of the colour palettes. Spectron is able to detect the maximal velocities and compute the mean and median velocities. Relative increases in maximal velocities in cardiac blood flows after the administration of inotropic drugs have been shown in the pilot studies that were conducted. Spectron is able to help in obtaining estimates of the aortic blood flows and in other applications such measuring vascular impedance. Stenotic blood flows can be detected by using the spectral broadening index and blood flow characteristics can be studied by using various blood flow indices. Thus, this project attempted to help in patient management by providing clinicians with a range of blood flow parameters and has succeeded in meeting its objective to a large extent
Master of Engineering (Hons)

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Mohan, Anusha. "Neural Correlates of Spectral, Temporal and Spectro-temporal Modulation". Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5078.

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Natural sounds are characterized by the distribution of acoustic power over different frequency regions and/or time. This is termed spectral, temporal or spectro-temporal modulation. The auditory system is equipped with banks of filters tuned to different spectral, temporal and spectro-temporal modulation frequencies (SM, TM, STM). The sensitivity of the peripheral system to these modulations can be measured by undertaking a linear systems approach. In addition to understanding the psychophysical sensitivity, studying the neural patterns of their processing is also critical. The current study is an attempt to understand the relationship between the behavioral and neural correlates of spectral, temporal and spectro-temporal processing in ten normal hearing subjects (age range 21-27 years; mean = 23.7 years). In the behavioral experiment, sensitivity to SM, TM and STM frequencies was estimated using a 3-interval, 3-alternative, forced-choice paradigm with a 3-down-1-up tracking algorithm. In the electrophysiological experiment, Electroencephalographs (EEGs) were recorded in a change-detection paradigm in response to the same set of modulation stimuli used in the behavioral experiment presented at 20 dB sensation level (SL). The EEG data were analyzed to determine the global field power and latencies of the N1and P2 components and the amplitude of the N1-P2 complex. Although an overall parietal dominance was observed for all of the components, the N1-P2 complex was strongly lateralized to the right hemisphere in the frontal region, but the hemispheric asymmetry decreased at central and parietal regions. A highly significant but weak to moderate negative correlation between individual behavioral thresholds and N1-P2 amplitudes was observed, and this relationship also was observed when behavioral spectro-temporal transfer functions and N1-P2 amplitude transfer functions were examined together. Thus the current project reveals that a relationship exists between the behavioral measures and neural correlates and gives us hope to work towards establishing this relationship.

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Régnier, David. "Contribution à l'étude des gammas prompts de fission". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI065.

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Cette thèse a essentiellement été motivée par la montée en puissance de la thématique des échauffements nucléaires en réacteurs. Elle avait pour objectif la mise en place de méthodes permettant la simulation de l'émission des gammas prompts de fission. Pour répondre à cette attente, différents algorithmes de désexcitation d'un noyau ont été implémentés. Ils ont été testés avec succès via plusieurs calculs d'application (rapport d'embranchement isomérique, largeur radiative totale, etc). Ces méthodes ont ensuite été mises en oeuvre dans le cadre du code de fission FIFRELIN. L'outil qui en résulte, permet la détermination d'un grand nombre d'observables de fission, dans le cadre d'un modèle unique. Une étude de sensibilité des résultats à différents éléments du calcul a été réalisée. Enfin, des simulations de la fission spontanée du 252Cf, et des fissions induites par neutrons thermiques sur l' 235U et le 239Pu ont été menées. Les spectres des gammas prompts pour ces trois systèmes fissionnants ont pu être déterminés. Les résultats obtenus sont en très bon accord avec les données expérimentales disponibles, dont certaines ont été publiées récemment (2012 et 2013)
This PhD thesis has essentially been motivated by the nuclear heating problematic in reactors. The main goal of this work was the production of methods capable of simulating the prompt gamma emission from fission. First of all, several algorithms for the treatment of the nucleus deexcitation were implemented. They have been succesfully tested through various calculations (isomeric branching ratio, total radiative width, etc). These methods were then incorporated in the frame of the fission code FIFRELIN. The tool which results from this work, enables the determination of numerous fission observables in the frame of a single consistent model. A sensitivity study of the results to several numerical and nuclear models has been realized. At last, calculation have been lead for the 252Cf spontaneous fission and the thermal neutron induced fission of 235U and 239Pu. The prompt gamma spectra obtained for those three fissionning systems have been determined. The results are in good agreement with available experimental data, including recent measurements published in 2012 and 2013

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Martin, Alexandre. "Théorie de Mourre et opérateurs de Schrödinger : De nouvelles classes d'opérateurs conjugués". Thesis, Cergy-Pontoise, 2018. http://www.theses.fr/2018CERG0978/document.

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Dans cette thèse, nous nous intéressons à l’étude du spectre essentiel d’opérateurs de Schrödinger et tout particulièrement à l’obtention d’un Principe d’Absorption Limite pour ces opérateurs. Ce Principe d’Absorption Limite consiste en l’existence d’une limite de l’opérateur résolvante lorsque le paramètre spectral se rapproche du spectre essentiel et permet de connaitre des informations sur le groupe engendré par l’Hamiltonien de Schrödinger. Une méthode pour montrer ce Principe d’Absorption Limite est d’utiliser la théorie de Mourre. Cette théorie nécessite l’utilisation d’un autre opérateur appellé opérateur conjugué. Lorsqu’on veut appliquer la théorie de Mourre aux opérateurs de Schrödinger, on utilise habituellement un opérateur conjugué nommé le générateur des dilatations. Cet opérateur implique que les dérivées du potentiel doivent avoir une certaine décroissance ce qui peut être gênant dans certains cas.Dans cette thèse, nous appliquerons le théorème de Mourre avec d’autres types d’opérateurs conjugués, dont certains n’impliquent pas de conditions de dérivabilité. Dans une première partie, nous nous intéresserons aux opérateurs de Schrödinger sur l’espace euclidienpour lesquels nous montrerons un Principe d’Absorption Limite à énergie strictement positive, un Principe d’Absorption Limite à énergie nulle et l’absence de valeurs propres plongées dans le spectre essentiel. Dans une seconde partie, nous nous intéresserons aux opérateurs de Schrödinger sur des guides d’ondes pour lesquels nous montrerons un Principe d’Absorption Limite loin des seuils et un Principe d’Absorption Limite près des seuils
In this thesis, we are interested in the study of the essential spectrum of Schrödinger operators and more particulary in the obtention of a Limiting Absorption Principle for these operators. This Limiting Absorption Principle consists on the existence of a limit for the resolvent operator when the spectral parameter is near the essential spectrum and permits to know some properties about the group generated by the Schrödinger Hamiltonian we study. A technique to prove this Limiting Absorption Principle is to use the Mourre theory. This theory needs to use an other operator called the conjugate operator. When we want to apply the Mourre theory to Schrödinger operators, we usually used a conjugate operatornamed the generator of dilations. This operator implies some conditions of decay on the derivatives of the potentials which can be a problem in certain cases. In this thesis, we will apply the Mourre theory with other types of conjugate operators wich, for some of them, does not imply any conditions on the derivatives of the potential.In a first part, we will be interested in Schrödinger operators on the euclidian space. We will show a Limiting Absorption Principle at positive energy, a Limiting Absorption principle at zero energy and the absence of eigenvalue embedded in the essential spectrum. In a second part, we will be interested in Schrödinger operators on wave guides for which we will prove a Limiting Absorption Principle far thresholds and near thresholds

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Rozario, Hoimonti Immaculata. "Spectroscopic study of acetylene and hydrogen cyanide". Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Physics and Astronomy, c2012, 2012. http://hdl.handle.net/10133/3415.

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High-resolution molecular spectroscopy has been used to study acetylene line parameters and emission spectra of hydrogen cyanide. All acetylene spectra were recorded in our laboratory at the University of Lethbridge using a 3-channel tuneable diode laser spectrometer. N2-broadened line widths and N2-pressure induced line shifts have been measured for transitions in the v1+v3 band of acetylene at seven temperatures in the range 213–333K to obtain the temperature dependences of broadening and shift coefficients. The Voigt and hard-collision line profile models were used to retrieve the line parameters. The line-broadening and line-shift coefficients as well as their temperature-dependent parameters have been also evaluated theoretically, in the frame work of a semi-classical approach based on an exponential representation of the scattering operator, an intermolecular potential composed of electrostatic quadrupole–quadrupole and pairwise atom–atom interactions as well as on exact trajectories driven by an effective isotropic potential. The experimental results for both N2-broadening and shifting show good agreement with the theoretical results. We have studied the line intensities of the 1νl20←0νl20 band system from the HCN emission spectrum. The infrared emission spectrum of H12C14N was measured at the Justus-Liebig University, Giessen, Germany. The emission spectrum was analyzed with the spectrum analysis software Symath running using Mathematica as a platform. This approach allowed us to retrieve information on band intensity parameters.
viii, 112 leaves : ill. ; 29 cm

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Dahl, Jason F. "Time Aliasing Methods of Spectrum Estimation". Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd157.pdf.

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Deepak, G. C. "Spectrum sharing systems for improving spectral efficiency in cognitive cellular network". Thesis, Lancaster University, 2017. http://eprints.lancs.ac.uk/85771/.

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Since spectrum is the invisible infrastructure that powers the wireless communication, the demand has been exceptionally increasing in recent years after the implementation of 4G and immense data requirements of 5G due to the applications, such as Internet-of-Things (IoT). Therefore, the effective optimization of the use of spectrum is immediately needed than ever before. The spectrum sensing is the prerequisite for optimal resource allocation in cognitive radio networks (CRN). Therefore, the spectrum sensing in wireless system with lower latency requirements is proposed first. In such systems with high spatial density of the base stations and users/objects, spectrum sharing enables spectrum reuse across very small regions. The proposed method in this Thesis is a multi-channel cooperative spectrum sensing technique, in which an independent network of sensors, namely, spectrum monitoring network, detects the spectrum availability. The locally aggregated decision in each zone associated with the zone aggregator (ZA) location is then passed to a decision fusion centre (DFC). The secondary base station (SBS) accordingly allocates the available channels to secondary users to maximize the spectral efficiency. The function of the DFC is formulated as an optimization problem with the objective of maximizing the spectral efficiency. The optimal detection threshold is obtained for different cases with various spatial densities of ZAs and SBSs. It is further shown that the proposed method reduces the spectrum sensing latency and results in a higher spectrum efficiency. Furthermore, a novel power allocation scheme for multicell CRN is proposed where the subchannel power allocation is performed by incorporating network-wide primary system communication activity. A collaborative subchannel monitoring scheme is proposed to evaluate the aggregated subchannel activity index (ASAI) to indicate the activity levels of primary users. Two utility functions are then defined to characterize the spectral efficiency (SE) and energy efficiency (EE) as a function of ASAI to formulate a utility maximization problem. The optimal transmit power allocation is then obtained with the objective of maximizing the total utility at the SBS, subject to maximum SBS transmit power and collision probability constraint at the primary receivers. Since optimal EE and SE are two contradicting objectives to obtain the transmit power allocation, the design approach to handle both EE and SE as a function of common network parameter, i.e., ASAI, is provided which ultimately proves the quantitative insights on efficient system design. Extensive simulation results confirm the analytical results and indicate a significant improvement in sensing latency and accuracy and a significant gain against the benchmark models on the rate performance, despite the proposed methods perform with lower signalling overhead.

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Bandeira, Nuno Filipe Cabrita. "Spectral networks algorithms for de novo interpretation of tandem mass spectra". Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3274510.

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Thesis (Ph. D.)--University of California, San Diego, 2007.
Title from first page of PDF file (viewed October 2, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 141-152).

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Filion, Côté Sandrine. "Spectro-angular optical biosensor based on surface plasmon resonance operating in the visible spectrum". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106424.

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Surface plasmon resonance (SPR) is one of the most widely used methods to implement biosensors because of its label-free and sensitive detection. Surface plasmon resonance allows the change in the refractive index of a sample to be measured accurately by the analysis of the light reflecting at a metal-dielectric interface. A way to increase the sensitivity of SPR biosensors was found in fabricating a spectro-angular SPR biosensor and using of a newly developed data processing method called the Double Projection Method. The objective of the work presented in this thesis is to improve further the detection limit of the spectro-angular biosensor by upgrading the cameras used for the data acquisition. Simulations have shown that the spatial resolution and the data precision have a significant impact on the accuracy of the refractive index change measurement. In this thesis, simulation results are presented to justify the modifications of the experimental system and to estimate the expected improvement in the detection limit of the spectro-angular biosensor by the use of higher spatial resolution and higher data precision cameras. The new design as well as the components purchased for the experimental set-up are detailed.
La résonance plasmonique de surface (SPR) est une méthode très utilisée pour la réalisation de biocapteurs grâce à sa détection très sensible et sans marqueur. La résonance plasmonique de surface permet une mesure précise du changement de l'indice de réfraction d'un échantillon par l'analyse de la lumière reflétant sur l'interface entre un métal et un diélectrique. Il a été démontré que la sensibilité des biocapteurs SPR puisse être accrue par la fabrication d'un biocapteur SPR spectro-angulaire utilisant une nouvelle méthode de traitement des données appelée Double Projection Method (la méthode par double projection). L'objectif du travail présenté dans cette thèse est d'améliorer la limite de détection du biocapteur spectro-angulaire grâce à l'utilisation de caméras plus performantes pour la cueillette de données. Des simulations ont démontré que la résolution spatiale et la précision des données ont un impact significatif sur la précision de la mesure du changement dans l'indice de réfraction. Dans cette thèse, des résultats de simulations seront présentés afin de justifier les modifications à apporter au système expérimental et de démontrer l'amélioration prévue de la limite de détection du biocapteur spectro-angulaire par l'utilisation de caméras plus performantes. La nouvelle conception ainsi que les composantes choisis pour le système expérimental seront détaillées.

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Kharroubi, Hassane. "Étude du pouvoir réflecteur de monocristaux uniaxes et biaxes dans l'infrarouge lointain". Nancy 1, 1994. http://www.theses.fr/1994NAN10108.

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L'étude du pouvoir réflecteur (r) et de la transmission (t) des milieux anisotropes et absorbants dans l'infrarouge lointain nous a conduit a présenter des expressions directement programmables des relations permettant la détermination des constantes optiques, l'indice de réfraction n et l'indice d'absorption k à partir des mesures expérimentales de r et de t. Nous avons établi les expressions des facteurs de réflexion et de transmission pour les deux polarisations possibles de l'onde, en fonction de l'angle d'incidence. L'étude est limitée au cas de la propagation d'une onde plane dans les plans principaux du cristal. Nous abordons ensuite le cas de la lame à faces parallèles qui représente physiquement nos échantillons. Les facteurs de réflexion et de transmission sont mesurés dans l'infrarouge lointain de 10 à 600 cm##1 en lumière polarisée pour des températures comprises entre 7 et 300 k. Pour cette étude nous avons choisi un cristal biaxe, le nitrite de sodium et deux cristaux uniaxes, la cassitérite et le quartz. La comparaison des résultats expérimentaux et des valeurs calculées nécessite la connaissance de la fonction diélectrique. Nous utilisons la forme factorisée de la fonction diélectrique. Les valeurs initiales des paramètres d'ajustage sont déterminées par une analyse de Kramers-Kronig du spectre de réflexion sous incidence normale. La mesure simultanée du pouvoir réflecteur et de la transmission de la lame nous permet d'apporter une correction pour déterminer la valeur vraie du pouvoir réflecteur des cristaux, valeur nécessaire pour les calculs de physique du solide

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Mais fontes

Livros sobre o assunto "Spectron"

Tomasi, Richard A. A spectrum of spectral problems. Tulsa, Oklahoma: Sunbelt R & T, Inc., 1994.

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Tomasi, Richard A. A spectrum of spectral problems. Tulsa, Oklahoma: Sunbelt R & T, Inc. [distributor], 1994.

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International, Conference on Spectral Line Shapes (14th 1998 State College Pennsylvania). Spectral line shapes. Woodbury, New York: American Institute of Physics, 1999.

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Colombo, Fabrizio, Jonathan Gantner e David P. Kimsey. Spectral Theory on the S-Spectrum for Quaternionic Operators. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03074-2.

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Borkowski, Józef. Metody interpolacji widma i metoda LIDFT w estymacji parametrów sygnału wieloczęstotliwościowego. Wrocław: Oficyna Wydawn. Politechniki Wrocławskiej, 2011.

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H, Clark R. J., e Hester R. E, eds. Spectroscopy of advanced materials. Chichester: Wiley, 1991.

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1942-, Kesler Stanislav B., ed. Modern spectrum analysis, II. New York: IEEE Press, 1986.

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Farmer, Crofton B. A high-resolution atlas of the infrared spectrum of the Sun and Earth atmosphere from space: A compilation of ATMOS spectra of the region from 650 to 4800 cm⁻¹ (2.3 to 16 [symbol for Greek letter mu]m). Washington, D.C: National Aeronautics and Space Administration, Scientific and Technical Information Service, 1989.

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Farmer, Crofton B. A high-resolution atlas of the infrared spectrum of the Sun and Earth atmosphere from space: A compilation of ATMOS spectra of the region from 650 to 4800 cm ℓ (2.3 to 16 [symbol for Greek letter mu]m). Washington, D.C: National Aeronautics and Space Administration, Scientific and Technical Information Service, 1989.

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Stars and their spectra: An introduction to the spectral sequence. Cambridge [Cambridgeshire]: Cambridge University Press, 1989.

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Capítulos de livros sobre o assunto "Spectron"

Griffith, Chris, e Leif Wells. "Testing with Spectron". In Electron: From Beginner to Pro, 213–29. Berkeley, CA: Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2826-5_14.

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Bessell, M. S., B. Barbuy, A. Boesgaard, P. Cottrell, M. Gerbaldi, D. Gray, G. Mathys et al. "Stellar Spectra (Spectres Stellaires)". In Reports on Astronomy, 283–92. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5762-9_27.

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McNally, Derek. "Stellar Spectra (Spectres Stellaires)". In Reports on Astronomy, 309–26. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3364-7_21.

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Salinger, D. L., e J. D. Stegeman. "Spectral synthesis and difference spectra". In Harmonic Analysis, 265–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/bfb0086607.

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Howland, James S. "Spectral concentration for dense point spectrum". In Lecture Notes in Mathematics, 1–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/bfb0084894.

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Wang, Mingxun, e Nuno Bandeira. "Spectral Library Generating Function for Assessing Spectrum-Spectrum Match Significance". In Lecture Notes in Computer Science, 287–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37195-0_27.

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Ustin, Susan L., e Stéphane Jacquemoud. "How the Optical Properties of Leaves Modify the Absorption and Scattering of Energy and Enhance Leaf Functionality". In Remote Sensing of Plant Biodiversity, 349–84. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33157-3_14.

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AbstractLeaves absorb, scatter, and transmit sunlight at all wavelengths across the visible, near-infrared, and shortwave-infrared spectrum. The optical properties of a leaf are determined by its biochemical and biophysical characteristics, including its 3-D cellular organization. The absorption and scattering properties of leaves together create the shape of their reflectance spectra. Terrestrial seed plant species share similar physiological and metabolic processes for fluxes of gases (CO2, O2, H2O), nutrients, and energy, while differences are primarily consequences of how these properties are distributed and their physical structures. Related species generally share biochemical and biophysical traits, and their optical properties are also similar, providing a mechanism for identification. However, it is often the minor differences in spectral properties throughout the wavelengths of the solar spectrum that define a species or groups of related species. This chapter provides a review and summary of the most common interactions between leaf properties and light and the physical processes that regulate the outcomes of these interactions.

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Ding, Guoru, Siyu Zhai, Xiaoming Chen, Yuming Zhang e Chao Liu. "Robust Spectral-Temporal Two-Dimensional Spectrum Prediction". In Machine Learning and Intelligent Communications, 393–401. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52730-7_40.

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Livšic, M. S., N. Kravitsky, A. S. Markus e V. Vinnikov. "Joint Spectrum and the Spectral Mapping Theorem". In Theory of Commuting Nonselfadjoint Operators, 73–80. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8561-3_5.

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Toscani, Matteo, e Anna Metzger. "A Database of Vibratory Signals from Free Haptic Exploration of Natural Material Textures and Perceptual Judgments (ViPer): Analysis of Spectral Statistics". In Haptics: Science, Technology, Applications, 319–27. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06249-0_36.

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AbstractWe recorded vibratory patterns elicited by free haptic exploration of a large set of natural textures with a steel tool tip. Vision and audio signals during the exploration were excluded. After the exploration of each sample, participants provided judgments about its perceptual attributes and material category. We found that vibratory signals can be approximated by a single parameter in the temporal frequency domain, in a similar way as we can describe the spatial frequency spectrum of natural images. This parameter varies systematically between material categories and correlates with human perceptual judgements. It provides an estimate of the spectral composition of the power spectra which is highly correlated with the differential activity of the Rapidly Adapting (RA) and Pacinian Corpuscle (PC) afferents.

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Trabalhos de conferências sobre o assunto "Spectron"

Karapetyan, Narek, Minas Sukiasyan, Hrach Toneyan, Aghavni Kutuzyan e Levon Kh Mouradian. "Spectron and Dispersive Fourier Transformation: Phase Aspect". In Frontiers in Optics. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/fio.2018.jtu3a.45.

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Katz, Simon, e Alex Katz. "Spectron: Seismic software package for adaptive signal processing". In SEG Technical Program Expanded Abstracts 1991. Society of Exploration Geophysicists, 1991. http://dx.doi.org/10.1190/1.1889062.

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Samman, Faizal Arya, e Pongyupinpanich Surapong. "SPECTRON: Streaming processor specific for adaptronic and biomeditronic applications". In 2012 5th Biomedical Engineering International Conference (BMEiCON). IEEE, 2012. http://dx.doi.org/10.1109/bmeicon.2012.6465416.

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Shcherbina, M. P., V. V. Busarev e S. I. Barabanov. "New reflectance spectra of Main belt asteroids: clarification of taxonomic types and composition of matter". In ASTRONOMY AT THE EPOCH OF MULTIMESSENGER STUDIES. Proceedings of the VAK-2021 conference, Aug 23–28, 2021. Crossref, 2022. http://dx.doi.org/10.51194/vak2021.2022.1.1.094.

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The mineralogy of the surface matter of asteroids can be judged using a qualitative interpretation of the reﬂection spectraof these bodies. The features of the reﬂectance spectra (absorption bands) are wide enough for correct interpretation even ata low resolution of the recording device. It should be noted that the number of events of registration of sublimation activityamong primitive asteroids has been increasing recently. The emergence of a temporary exosphere aﬀects the asteroid’sreﬂection spectrum. The reﬂection spectra of 12 asteroids of the Main Belt, mainly of primitive type, have been obtainedand analyzed. The aim of the research was to study the inﬂuence of the temporal exosphere on the correct determinationof the spectral type of the asteroid. In addition, for asteroid 203 Pompeia, the spectral type has been determined for theﬁrst time(class C).

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Ishijima, Tatsuki, e Takahide Sakamoto. "Wideband Ultra-Flat Spectral Enhancement by Cascaded Phase Modulation on Frequency Comb Generated from Mach-Zehnder Modulator". In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jth3a.24.

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We demonstrated efficient spectral enhancement of comb generator where cascaded phase-modulation was applied to comb generated from Mach-Zehnder Modulator; additionally enhancing spectra keeping spectral flatness without increasing modulators cascade scale. 25×25-GHz spectrum was experimentally generated.

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Dai, Bin, Christopher Jones, Jimmy Price, Darren Gascooke e Anthony Van Zuilekom. "COMPRESSIVE SENSING BASED OPTICAL SPECTROMETER FOR DOWNHOLE FLUID ANALYSIS". In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0112.

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Downhole fluid analysis has the potential to resolve ambiguity in very complex reservoirs. Downhole fluid spectra contain a wealth of information to fingerprint a fluid and help to assess continuity. Commonly, a narrowband spectrometer with limited number of channels is used to acquire optical spectra of downhole fluid. The spectral resolution of this type of spectrometer is low due to limited number of narrowband channels. In this paper, we demonstrate a new type, compressive sensing (CS) based broadband spectrometer that provides accurate and high-resolution spectral measurement. Several specially designed broadband filters are used to simplify the mechanical, electrical, optical, and computational construction of a spectrometer, therefore provides measurement of fluid spectrum with high signal-to-noise ratio, robustness, and a broader spectral range. The compressive sensing spectrometer relies on reconstruction technique to compute the optical spectrum. Based on a large spectral database, containing more than 10000 spectra of various fluids at different temperature and pressure conditions, which were collected using conventional high resolution spectrometer in a lab, the basis functions of the optical spectra of three types of fluids (water, oil and gas/condensate) can be extracted. The reconstruction algorithm first classifies the fluid into one of three fluid types based on multichannel CS spectrometer measurements, the optical spectrum is reconstructed by using linear combination of the basis functions of corresponding fluid type, with weighting coefficients determined by minimizing the difference between calculated detector responses and measured detector responses across multiple optical channels. The reconstructed data may then be used for purposes such as contamination measurement, fluid property trends for reservoir continuity assessment, and digital sampling. Digital sampling is the process of extrapolating clean fluid properties from formation fluids not physically sampled. The reconstruction spectrum covers wavelengths from 500 nm to 3300 nm, which is a wider spectral region than has historically been accessible to formation testers. The expanded wavelength range allows access of the mid-infrared spectral region for which synthetic drilling-fluid components typically have higher optical absorbance. This reconstruction spectra may allow contamination to be directly determined. This paper will discuss the CS optical spectrometer design, fluid classification and spectral reconstruction algorithm. In addition, the applicability of the technique to fluid continuity assessment, sample contamination assessment and digital sampling will also be discussed.

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Querry, Marvin R., e W. Patrick Roach. "Optical properties of polycrystalline molybdenum". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.ws4.

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Near-normal incidence reflectance of two different samples of mechanically polished, 99.97% pure, polycrystalline molybdenum was measured at 6121 spectral positions through the 0.0223–6.2-eV (180–50,000-cm−1) spectral range. A composite reflectance spectrum of Mo was obtained by objectively combining the reflectance spectra of the two samples. A Drude free-electron model was fitted to the composite reflectance spectrum in the 0.0223–0.062-eV region; the composite reflectance spectrum was thus extended into the 0–0.0223-eV region. In the 5.56–2000-eV region reflectance values obtained from the literature1 joined very well with the composite reflectance spectrum. Kramers-Kronig analysis of the reflectance spectrum provided the complex dielectric function, refractive index, and optical conductivity. We briefly review spectral values of these optical properties of Mo previously determined by other investigators, and we graphically compare results from our investigations with those from the previous investigations.

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Fullerton, Anne M., e Thomas C. Fu. "Statistics of Greater Sea States". In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49934.

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Accurate representations of seaway statistics are important for physical and computational predictions of ship motions. The spectra that are most typically used in these applications are the Pierson-Moskowitz or Bretschneider. While these spectra are useful for fully developed seas, the larger sea states (Sea State (SS) 7 and higher) are typically not fully developed. In these cases, other spectral models may be more appropriate. It is critical to ship motion prediction, for both physical and numerical models, to accurately capture the frequency range for the sea state of interest. Sea state statistics, including wave heights, periods, and spectral bandwidths from various buoys and a platform in the North Sea are collected and compared with statistics from lower sea states. The spectral data are then averaged to generate a typical spectrum under the measured conditions. These developed spectra are compared with the ideal spectra mentioned previously.

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Nicolai, Julian, e Jacques Albert. "Tilted FBG Sensor Data Extraction with Low-Resolution Spectral Interrogation Instrumentation". In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4a.46.

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TFBG sensor spectra contains a fine comb of narrowband cladding mode resonances. Spectral contour length method analysis is shown to provide precise refractive index and curvature measurements with low-resolution, low-cost optical spectrum analyzers.

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Lucchini, Andrea, Paolo Franchin e Fabrizio Mollaioli. "A Spectrum-to-Spectrum Method for Calculating Uniform Hazard Floor Response Spectra". In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65293.

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In codes’ provisions and design procedures for acceleration-sensitive nonstructural components, seismic demand is commonly defined by means of floor response spectra expressed in terms of pseudo-acceleration. Depending on the considered analysis method, floor response spectra may be derived from floors’ acceleration histories, based on structural response-history analysis, or calculated using a predictive equation from a given input ground motion spectrum. Methods for estimating floor response spectra that are based on the second alternative are commonly called spectrum-to-spectrum methods. The objective of this paper is to briefly review these methods, and to discuss the main assumptions they are based on. Both predictive equations from selected seismic codes and proposals from the literature are included in the review. A new probability-based method, recently developed by the Authors for generating uniform hazard floor response spectra, namely, floor response spectra whose ordinates are characterized by a given target value of the mean annual frequency of being exceeded, is also described. By using this method floor spectra are determined through closed-form equations, given the mean annual frequency of interest, the damping ratio of the spectra, the modal properties of the structure, and three uniform hazard ground spectra. The method is built on a proposal for a probabilistic seismic demand model that relates the ground spectral acceleration with the floor spectral acceleration, and is able to explicitly account for the ground motion variability of the nonstructural response. Results for a case study consisting of a service frame of a visbreaking unit in an oil refinery are presented to show the good predictive accuracy of the method with respect to exact uniform hazard floor response spectra obtained through a standard probabilistic analysis.

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Relatórios de organizações sobre o assunto "Spectron"

Lee, Amy Sarah. Determination of the Spectral Index in the Fission Spectrum Energy Regime. Office of Scientific and Technical Information (OSTI), maio de 2016. http://dx.doi.org/10.2172/1253539.

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Alchanatis, Victor, Stephen W. Searcy, Moshe Meron, W. Lee, G. Y. Li e A. Ben Porath. Prediction of Nitrogen Stress Using Reflectance Techniques. United States Department of Agriculture, novembro de 2001. http://dx.doi.org/10.32747/2001.7580664.bard.

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Commercial agriculture has come under increasing pressure to reduce nitrogen fertilizer inputs in order to minimize potential nonpoint source pollution of ground and surface waters. This has resulted in increased interest in site specific fertilizer management. One way to solve pollution problems would be to determine crop nutrient needs in real time, using remote detection, and regulating fertilizer dispensed by an applicator. By detecting actual plant needs, only the additional nitrogen necessary to optimize production would be supplied. This research aimed to develop techniques for real time assessment of nitrogen status of corn using a mobile sensor with the potential to regulate nitrogen application based on data from that sensor. Specifically, the research first attempted to determine the system parameters necessary to optimize reflectance spectra of corn plants as a function of growth stage, chlorophyll and nitrogen status. In addition to that, an adaptable, multispectral sensor and the signal processing algorithm to provide real time, in-field assessment of corn nitrogen status was developed. Spectral characteristics of corn leaves reflectance were investigated in order to estimate the nitrogen status of the plants, using a commercial laboratory spectrometer. Statistical models relating leaf N and reflectance spectra were developed for both greenhouse and field plots. A basis was established for assessing nitrogen status using spectral reflectance from plant canopies. The combined effect of variety and N treatment was studied by measuring the reflectance of three varieties of different leaf characteristic color and five different N treatments. The variety effect on the reflectance at 552 nm was not significant (a = 0.01), while canonical discriminant analysis showed promising results for distinguishing different variety and N treatment, using spectral reflectance. Ambient illumination was found inappropriate for reliable, one-beam spectral reflectance measurement of the plants canopy due to the strong spectral lines of sunlight. Therefore, artificial light was consequently used. For in-field N status measurement, a dark chamber was constructed, to include the sensor, along with artificial illumination. Two different approaches were tested (i) use of spatially scattered artificial light, and (ii) use of collimated artificial light beam. It was found that the collimated beam along with a proper design of the sensor-beam geometry yielded the best results in terms of reducing the noise due to variable background, and maintaining the same distance from the sensor to the sample point of the canopy. A multispectral sensor assembly, based on a linear variable filter was designed, constructed and tested. The sensor assembly combined two sensors to cover the range of 400 to 1100 nm, a mounting frame, and a field data acquisition system. Using the mobile dark chamber and the developed sensor, as well as an off-the-shelf sensor, in- field nitrogen status of the plants canopy was measured. Statistical analysis of the acquired in-field data showed that the nitrogen status of the com leaves can be predicted with a SEP (Standard Error of Prediction) of 0.27%. The stage of maturity of the crop affected the relationship between the reflectance spectrum and the nitrogen status of the leaves. Specifically, the best prediction results were obtained when a separate model was used for each maturity stage. In-field assessment of the nitrogen status of corn leaves was successfully carried out by non contact measurement of the reflectance spectrum. This technology is now mature to be incorporated in field implements for on-line control of fertilizer application.

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Wilson, R. D. Spectrum shape-analysis techniques applied to the Hanford Tank Farms spectral gamma logs. Office of Scientific and Technical Information (OSTI), maio de 1997. http://dx.doi.org/10.2172/501524.

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Loisel, Guillaume Pascal. z3308 z3309 photoionized Fe spectra and z3147 satire SS spectrum for Ryan Childers (UNR). Office of Scientific and Technical Information (OSTI), março de 2020. http://dx.doi.org/10.2172/1604874.

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Hearst, J. R. Choice of computer software for analysis of spectra from the Multi-Spectral Logging System. Office of Scientific and Technical Information (OSTI), julho de 1994. http://dx.doi.org/10.2172/10182794.

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Shokair, I. R. Orthogonal spectra and cross sections: Application to optimization of multi-spectral absorption and fluorescence lidar. Office of Scientific and Technical Information (OSTI), setembro de 1997. http://dx.doi.org/10.2172/653931.

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MARSHAK, ALEXANDER. Study of shortwave spectra in fully 3D environment: synergy between scanning radars and spectral radiation measurements. Office of Scientific and Technical Information (OSTI), dezembro de 2019. http://dx.doi.org/10.2172/1576788.

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White, H. P., J. C. Deguise, J. W. Schwarz, R. Hitchcock e K. Staenz. Defining Shaded Spectra by Model Inversion for Spectral Unmixing of Hyperspectral Datasets - Theory and Preliminary Application. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/219895.

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Zapata, L. E. Absolute intensity, high resolution spectrum of the vortek arc lamp and its spectral match to Nd:YAG bands. Office of Scientific and Technical Information (OSTI), maio de 1989. http://dx.doi.org/10.2172/6184137.

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Depireux, Didier A., Jonathan Z. Simon, David J. Klein e Shihab A. Shamma. Dynamics of Neural Responses in Ferret Primary Auditory Cortex: I. Spectro-Temporal Response Field Characterization by Dynamic Ripple Spectra. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 1999. http://dx.doi.org/10.21236/ada439778.

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