Relevant bibliographies by topics / Emission and transmission spectrum

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Emission and transmission spectrum'

Author: Grafiati
Published: 3 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Emission and transmission spectrum"

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Lu, Lewei. "Observation and feature measurements of cloud and haze in exoplanet atmosphere based on transmission spectra." Highlights in Science, Engineering and Technology 38 (March 16, 2023): 90–96. http://dx.doi.org/10.54097/hset.v38i.5738.

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Clouds and hazes are important components of exoplanet atmospheres. This paper generalizes features and applications of exoplanet clouds and hazes in transmission spectra. A transmission spectrum presents a planet atmosphere’s wavelength-dependent absorption ability of host star’s radiation during transit. Effective transit radius model is often adopted to explain the wavelength-dependent absorption. In spectrum processing, the effect of stellar limb darkening and star spots should be taken into consideration. Clouds and hazes change features of planet transmission spectrums considerably, e.g., clouds reduce or eliminate absorption features on all bands observed. Since hazes (with small sizes) produce Rayleigh scattering, their reduction in absorption depth is greater in optical band than in infrared band. As transmission spectrum provides limited data about exoplanet atmospheres, emission and reflection spectrum during secondary transit should receive more observation. JWST will perform well in all forms of atmospheric spectrum observation. Advanced knowledge about clouds and hazes will benefit the confine of exoplanet atmospheres’ chemical composition, biosignatures, meteorology as well as planet evolvement model. These results shed light on guiding further exploration of exoplanets and life possibilities on them.
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Wang, Zhijian, Haiming Zhang, Zhijun Wang, et al. "Structure and strong ultraviolet emission characteristics of amorphous ZnO films grown by electrophoretic deposition." Journal of Materials Research 18, no. 1 (2003): 151–55. http://dx.doi.org/10.1557/jmr.2003.0021.

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Structure and ultraviolet emission characteristics of amorphous ZnO films grown on indium tin oxide coated glass substrates by electrophoretic deposition were investigated using Raman spectra and photoluminescence. The Raman spectrum shows a unique resonant multiphonon process within amorphous ZnO films. The photoluminescence spectrum of amorphous ZnO films shows a strong ultraviolet emission while the visible emission is nearly fully quenched. The transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectrum, and infrared spectrum are used to detect the structure of amorphous ZnO powder. The complex water plays an important role in the photoluminescence intensity emission.
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Kappelmeier, John A., Ryan J. MacDonald, and Nikole K. Lewis. "From the Shadows: The Impact of Nightside Thermal Emission on Ultrahot Jupiter Transmission Spectrum Retrievals." Astrophysical Journal 975, no. 1 (2024): 61. http://dx.doi.org/10.3847/1538-4357/ad6f9d.

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Abstract Transmission spectroscopy is the most widely used technique for studying exoplanet atmospheres. Since the planetary nightside faces the observer during a transit, highly irradiated giant exoplanets with warm nightsides emit thermal radiation that can contaminate transmission spectra. Observations of ultrahot Jupiters in the near- and mid-infrared with JWST are especially susceptible to nightside contamination. However, nightside thermal emission is generally not considered in atmospheric retrievals of exoplanet transmission spectra. Here, we quantify the potential biases from neglecting nightside thermal emission in multidimensional atmospheric retrievals of an ultrahot Jupiter. Using simulated JWST transmission spectra of the ultrahot Jupiter WASP-33b (0.8–12 μm), we find that transmission spectrum retrievals without nightside emission can overestimate molecular abundances by almost an order of magnitude and underestimate the dayside temperature by ≳400 K. We show that a modified retrieval prescription, including both transmitted light and nightside thermal emission, correctly recovers the atmospheric properties and is favored by Bayesian model comparisons. Nightside thermal contamination can be readily implemented in retrieval models via a first-order approximation, and we provide formulae to estimate whether this effect is likely to be significant for a given planet. We recommend that nightside emission should be included as standard practice when interpreting ultrahot Jupiter transmission spectra with JWST.
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Pell, Randy J., Charles E. Miller, Bruce R. Kowalski, and James B. Callis. "Infrared Emission Spectroscopy with Transient Cooling." Applied Spectroscopy 47, no. 12 (1993): 2064–71. http://dx.doi.org/10.1366/0003702934066235.

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A new approach for collection of infrared spectral data from optically opaque materials is explored. This approach has previously been introduced in the literature and is known as transient infrared transmission spectroscopy (TIRTS). The front surface of a hot sample is transiently cooled with a jet of cold gas, and the ratio of the spectrum measured after cooling to that measured before cooling is shown to closely resemble a transmission spectrum. This report provides for a more theoretical understanding of the experiments than provided by previous workers, making use of unsteady-state heat flow calculations, harmonic oscillator modeling, and radiation transfer theory. Experimental data are collected from a solid polymer sample and two viscous liquid samples. The position of the spectral features for the emission measurements corresponds with transmission measurements, with some saturation of the more intense spectral features noted. Faster scanning instrumentation, proper pulse scan synchronization, or rotation of solid samples, as demonstrated by previous workers, may resolve the saturation problem.
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Kaplan, M. S., D. R. Haynor, R. S. Miyaoka, T. K. Lewellen, and R. L. Harrison. "Simultaneous transmission/emission imaging for SPECT using energy spectrum fitting." IEEE Transactions on Nuclear Science 42, no. 4 (1995): 1196–200. http://dx.doi.org/10.1109/23.467850.

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Goyal, Jayesh M., Nathan Mayne, Benjamin Drummond, et al. "A library of self-consistent simulated exoplanet atmospheres." Monthly Notices of the Royal Astronomical Society 498, no. 4 (2020): 4680–704. http://dx.doi.org/10.1093/mnras/staa2300.

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ABSTRACT We present a publicly available library of model atmospheres with radiative-convective equilibrium pressure–temperature (P-T) profiles fully consistent with equilibrium chemical abundances, and the corresponding emission and transmission spectrum with R ∼ 5000 at 0.2 µm decreasing to R ∼ 35 at 30 µm, for 89 hot Jupiter exoplanets, for four recirculation factors, six metallicities, and six C/O ratios. We find the choice of condensation process (local/rainout) alters the P-T profile and thereby the spectrum substantially, potentially detectable by James Webb Space Telescope. We find H− opacity can contribute to form a strong temperature inversion in ultrahot Jupiters for C/O ratios ≥ 1 and can make transmission spectra features flat in the optical, alongside altering the entire emission spectra. We highlight how adopting different model choices such as thermal ionization, opacities, line-wing profiles and the methodology of varying the C/O ratio, effects the P-T structure, and the spectrum. We show the role of Fe opacity to form primary/secondary inversion in the atmosphere. We use WASP-17b and WASP-121b as test cases to demonstrate the effect of grid parameters across their full range, while highlighting some important findings, concerning the overall atmospheric structure, chemical transition regimes, and their observables. Finally, we apply this library to the current transmission and emission spectra observations of WASP-121b, which shows H2O and tentative evidence for VO at the limb, and H2O emission feature indicative of inversion on the dayside, with very low energy redistribution, thereby demonstrating the applicability of library for planning and interpreting observations of transmission and emission spectrum.
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De Cesare, Pablo Nicolas. "Characterization of the ISDB-Tb critical spectrum mask." ACTA IMEKO 1, no. 1 (2012): 42. http://dx.doi.org/10.21014/acta_imeko.v1i1.19.

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Non-linearity in the ISDB-T transmission chain causes intermodulation products that widens the spectrum emission and should be taken into account when assigning frequency channels. The characterization of the transmission spectrum mask is one of the most important measurements in order to achieve the best use of the electromagnetic spectrum. The use of critical mask defined in [1] allows allocations of co-site adjacent channels for an efficient use of the electromagnetic spectrum that is a finite and limited resource. This paper discusses different test procedures using spectrum analyzers and dedicated digital TV analyzers in order to measure the ISDB-T transmission mask.
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Solomon, Peter R., Robert M. Carangelo, David G. Hamblen, and Philip E. Best. "Infrared Analysis of Particulates by FT-IR Emission/Transmission Spectroscopy." Applied Spectroscopy 40, no. 6 (1986): 746–59. http://dx.doi.org/10.1366/0003702864508421.

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In this paper we report on a new method for the on-line chemical characterization of gas-suspended particulate and liquid droplet streams. The method is a combination of emission and transmission (E/T) spectroscopy performed using a Fourier transform infrared (FT-IR) spectrometer and a cell which allows analysis of room-temperature particulates surrounded by hot walls. The method was based on the discovery that the spectrum of radiation coming from such particles contained structure corresponding to the infrared absorption spectrum of the particulates. It was determined that the observed energy was wall radiation which reaches the detector after refraction by, and transmission through the particles. The shape of the observed spectrum relative to that of the wall spectrum is reduced at the absorption bands of the particulates. The general concepts of the E/T method were validated by samples with sizes varying from a few to several hundred microns with varying optical properties. For solids, excellent results were achieved for composition measurements. For a sample of known particle size, quantitative absorbance spectra were obtained from the E/T spectra with the use of a model based on ray optics. The spectra were in good quantitative agreement with absorbance spectra derived by the KBr pellet method for the same sample thickness. The E/T derived spectra were somewhat noisier than the KBr pellet spectra, but were free of Christiansen effect band distortions and scattering contributions. The E/T method has the additional advantage of requiring little or no sample preparation.
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Ridden-Harper, Andrew, Ernst de Mooij, Ray Jayawardhana, Neale Gibson, Raine Karjalainen, and Marie Karjalainen. "High-resolution Emission Spectroscopy of the Ultrahot Jupiter KELT-9b: Little Variation in Day- and Nightside Emission Line Contrasts." Astronomical Journal 165, no. 5 (2023): 211. http://dx.doi.org/10.3847/1538-3881/acc654.

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Abstract The transmission spectrum of the ultrahot Jupiter KELT-9b (T eq ∼ 4000 K) exhibits absorption by several metal species. We searched for atomic and molecular lines in its emission spectrum by observing partial phase curves with the Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Echelle Spectrographs (R ∼ 80,000–95,000). We find evidence for emission by Si i in the atmosphere of KELT-9b for the first time. Additionally we find evidence for emission by Mg i and Ca ii, which were previously detected in transmission, and confirmed earlier detections of Fe i emission. Conversely, we find no evidence for dayside emission from Al i, Ca i, Cr i, FeH, Fe ii, K i, Li i, Mg ii, Na i, OH, Ti i, TiO, V i, V ii, VO, and Y i. By employing likelihood mapping, we find indications of there being little variation in emission line contrast between the day- and nightsides—suggesting that KELT-9b may harbor iron emission on its nightside. Our results demonstrate that high-resolution ground-based emission spectroscopy can provide valuable insights into exoplanet atmospheres.
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SONG, KAI, RENAUD VALLEE, MARK VAN DER AUWERAER, and KOEN CLAYS. "SPONTANEOUS EMISSION OF NANO-ENGINEERED FLUOROPHORES IN PHOTONIC CRYSTALS." Journal of Nonlinear Optical Physics & Materials 15, no. 01 (2006): 1–8. http://dx.doi.org/10.1142/s0218863506003128.

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The spontaneous emission of fluorophores embedded in a photonic crystal has been studied. By nano-engineering a sandwich-like photonic structure, such that fluorophore-coated photonic atoms constitute a middle layer between the photonic crystals, we have been able to precisely control the location of fluorophores in photonic crystals and exclude the presence of fluorophores at the surface of the crystal. It has been found that the stopband in the transmission spectrum is deeper than the stopband in the emission spectrum. We conjecture that the omnidirectional propagation of the emission from a point source in an incomplete photonic bandgap is the cause of the shallower stopband in emission.
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Dissertations / Theses on the topic "Emission and transmission spectrum"

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Fu, Zhu. "Digital Pre-distortion for Interference Reduction in Dynamic Spectrum Access Networks." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/152.

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Given the ever increasing reliance of today’s society on ubiquitous wireless access, the paradigm of dynamic spectrum access (DSA) as been proposed and implemented for utilizing the limited wireless spectrum more efficiently. Orthogonal frequency division multiplexing (OFDM) is growing in popularity for adoption into wireless services employing DSA frame- work, due to its high bandwidth efficiency and resiliency to multipath fading. While these advantages have been proven for many wireless applications, including LTE-Advanced and numerous IEEE wireless standards, one potential drawback of OFDM or its non-contiguous variant, NC-OFDM, is that it exhibits high peak-to-average power ratios (PAPR), which can induce in-band and out-of-band (OOB) distortions when the peaks of the waveform enter the compression region of the transmitter power amplifier (PA). Such OOB emissions can interfere with existing neighboring transmissions, and thereby severely deteriorate the reliability of the DSA network. A performance-enhancing digital pre-distortion (DPD) technique compensating for PA and in-phase/quadrature (I/Q) modulator distortions is proposed in this dissertation. Al- though substantial research efforts into designing DPD schemes have already been presented in the open literature, there still exists numerous opportunities to further improve upon the performance of OOB suppression for NC-OFDM transmission in the presence of RF front-end impairments. A set of orthogonal polynomial basis functions is proposed in this dissertation together with a simplified joint DPD structure. A performance analysis is presented to show that the OOB emissions is reduced to approximately 50 dBc with proposed algorithms employed during NC-OFDM transmission. Furthermore, a novel and intuitive DPD solution that can minimize the power regrowth at any pre-specified frequency in the spurious domain is proposed in this dissertation. Conventional DPD methods have been proven to be able to effectively reduce the OOB emissions that fall on top of adjacent channels. However more spectral emissions in more distant frequency ranges are generated by employing such DPD solutions, which are potentially in violation of the spurious emission limit. At the same time, the emissions in adjacent channel must be kept under the OOB limit. To the best of the author’s knowledge, there has not been extensive research conducted on this topic. Mathematical derivation procedures of the proposed algorithm are provided for both memoryless nonlinear model and memory-based nonlinear model. Simulation results show that the proposed method is able to provide a good balance of OOB emissions and emissions in the far out spurious domain, by reducing the spurious emissions by 4-5 dB while maintaining the adjacent channel leakage ratio (ACLR) improvement by at least 10 dB, comparing to the PA output spectrum without any DPD.
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Bury, Andreas. "Efficient multi-carrier spread spectrum transmission /." Düsseldorf : VDI-Verl, 2001. http://www.gbv.de/dms/bs/toc/339637714.pdf.

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Goavec, Anthony. "Conception d'un estimateur intégré en technologie CMOS de la densité spectrale de puissance pour l’auto-calibration des émetteurs radio impulsionnels ultra-large bande." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0052/document.

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Ce travail de thèse s’articule autour de la problématique du respect des gabarits spectraux d’émission imposés par les règlementations et les normes dans le domaine des émetteurs radio impulsionnels ultra-large bande. Le choix a été fait de réaliser un capteur in-situ venant extraire les informations nécessaires à une estimation sur puce de la densité spectrale de puissance. Un algorithme d’estimation embarqué peut alors permettre de détecter les gabarits violés et pouvoir rétroagir sur le dispositif. La grande diversité constatée parmi les règlementations et les normes en vigueur ainsi que dans les différentes architectures de générateurs d'impulsions a alors motivé la réalisation d'un système de calibration universel à tous les émetteurs par prise d'informations en sortie. Le manuscrit s'est alors employé à représenter une impulsion à partir de son enveloppe instantanée et de sa fréquence instantanée, ces deux grandeurs temporelles pouvant être extraites pour tout type d'impulsions. Il a été également proposé dans le chapitre une première technique de calibration basée sur la modification de l'enveloppe à des instants précis qui permet de faire rentrer le spectre dans le gabarit tout en maximisant l'occupation de celui-ci. Enfin, l'extraction de l'enveloppe instantanée et de la fréquence instantanée a été abordée en proposant une technique d'extraction par transposition de l'information en bande de base. La conception des dispositifs électroniques nécessaires a été présentée et ceux-ci ont été implémentés sur la même puce qu'un générateur d'impulsions dans le but de réaliser un démonstrateur qui a validé l'utilisation du système étudié<br>This thesis focusses on the power emission constraints defined by regulations and standards for every kinds of ultra-wide band impulse radio transmitters. In fact, these power emission constraints have to be respected all along the device life. Also, an integrated sensor able to extract the essential information for an on-chip estimation of the power spectral density has been realized. Then, an embedded algorithm is added to the system and detects if a power limit is broken. If necessary, it acts on the transmitter to solve the problem. In the first chapter, a large variety of power constraints shapes and several architectures of impulse generators have been observed and studied. Therefore, the aim of this thesis is to realise a calibration system which would be universal to all impulse radio transmitters. After its extraction at the output of the transmitter, information have to be downconverted in order to reduce the constraints on conversion stage but without using a local oscillator and a mixer. A model for the impulse signal based on the instantaneous envelop and on the instantaneous frequency has been proposed in the second chapter. A new calibration method based on these two signals is also presented. The last chapter concentrates on detailing the extraction of the instantaneous envelop and the instantaneous frequency. The design of the electronic devices essential to this extraction is presented and a chip has been realised and the viability of the solution shown
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Smith, Wallace D. "Acoustic emission from spectrum fatigue cracks in 7075 aluminum." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA246391.

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Thesis (M.S. in Aeronautical Engineering and Aeronautics and Astronautics Engineer's Degree)--Naval Postgraduate School, December 1990.<br>Thesis Advisor: Gorman, Michael R. Second Reader: Dutta, Indranath. "December 1990." Description based on title screen as viewed on April 2, 2010. DTIC Identifier(s): Aluminum, fatigue (mechanics), cracking (fracturing), acoustic emissions, wings, fixed wing aircraft, reconnaissance aircraft, flight simulation, 7075 aluminum, theses, naval aircraft, stress waves, crack propagation, acoustic detection, fatigue life, E-2c aircraft, safety factor, mechanical properties. Author(s) subject terms: Includes bibliographical references (p. 69-71). Also available in print.
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Goavec, Anthony. "Conception d'un estimateur intégré en technologie CMOS de la densité spectrale de puissance pour l’auto-calibration des émetteurs radio impulsionnels ultra-large bande." Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0052.

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Ce travail de thèse s’articule autour de la problématique du respect des gabarits spectraux d’émission imposés par les règlementations et les normes dans le domaine des émetteurs radio impulsionnels ultra-large bande. Le choix a été fait de réaliser un capteur in-situ venant extraire les informations nécessaires à une estimation sur puce de la densité spectrale de puissance. Un algorithme d’estimation embarqué peut alors permettre de détecter les gabarits violés et pouvoir rétroagir sur le dispositif. La grande diversité constatée parmi les règlementations et les normes en vigueur ainsi que dans les différentes architectures de générateurs d'impulsions a alors motivé la réalisation d'un système de calibration universel à tous les émetteurs par prise d'informations en sortie. Le manuscrit s'est alors employé à représenter une impulsion à partir de son enveloppe instantanée et de sa fréquence instantanée, ces deux grandeurs temporelles pouvant être extraites pour tout type d'impulsions. Il a été également proposé dans le chapitre une première technique de calibration basée sur la modification de l'enveloppe à des instants précis qui permet de faire rentrer le spectre dans le gabarit tout en maximisant l'occupation de celui-ci. Enfin, l'extraction de l'enveloppe instantanée et de la fréquence instantanée a été abordée en proposant une technique d'extraction par transposition de l'information en bande de base. La conception des dispositifs électroniques nécessaires a été présentée et ceux-ci ont été implémentés sur la même puce qu'un générateur d'impulsions dans le but de réaliser un démonstrateur qui a validé l'utilisation du système étudié<br>This thesis focusses on the power emission constraints defined by regulations and standards for every kinds of ultra-wide band impulse radio transmitters. In fact, these power emission constraints have to be respected all along the device life. Also, an integrated sensor able to extract the essential information for an on-chip estimation of the power spectral density has been realized. Then, an embedded algorithm is added to the system and detects if a power limit is broken. If necessary, it acts on the transmitter to solve the problem. In the first chapter, a large variety of power constraints shapes and several architectures of impulse generators have been observed and studied. Therefore, the aim of this thesis is to realise a calibration system which would be universal to all impulse radio transmitters. After its extraction at the output of the transmitter, information have to be downconverted in order to reduce the constraints on conversion stage but without using a local oscillator and a mixer. A model for the impulse signal based on the instantaneous envelop and on the instantaneous frequency has been proposed in the second chapter. A new calibration method based on these two signals is also presented. The last chapter concentrates on detailing the extraction of the instantaneous envelop and the instantaneous frequency. The design of the electronic devices essential to this extraction is presented and a chip has been realised and the viability of the solution shown
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Hemmatyar, Ali. "Impact of Erroneous Transmission on Secondary Spectrum Access." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91850.

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The rapid development and deployment of wireless devices demand for the efficient spectrum usage to ensure quality of service. Thus, regulatory bodies opened new dimensions regarding the sharing of spectrum among the owners, keeping the respect of exclusive users as a primary objective. The main concern of secondary spectrum access is to protect primary licensed user from harmful interference of secondary devices. Accordingly, there are some rules to control interference aggregation to the primary victim, and this is accomplished by characterizing the aggregate interference. Statistical models of interference aggregation have been considered in previous studied. But, in real systems, secondary users do not follow the rules all the time and there might be erroneous transmission due to different reasons. In this thesis we developed a statistical model of aggregate interference when we take erroneous transmissions into account. In addition, probability distribution of the aggregate interference is approximated through its cumulants. The derived approximation shows a good agreement with Monte Carlo simulation result in tail region under specific conditions. It is also shown that even a single wrongdoer may dramatically degrade spectrum sharing opportunities particularly when it is relatively close to the primary receiver depending on the transmitted power to the victim receiver. Finally, impacts of erroneous transmission on the secondary access under variations in the density of opportunistic users and their probability of wrong transmission are investigated.
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Fort, Tania. "Functions, transmission and emission of the canopy microbiota." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0338.

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Les arbres interagissent avec des communautés microbiennes diversifiées qui influencent leur fitness et le fonctionnement des écosystèmes terrestres. Contrairement aux micro-organismes associés aux racines et au sol, les micro-organismes qui colonisent la canopée forestière sont encore mal connus. L’objectif de cette thèse est de mieux comprendre les fonctions des micro-organismes associés aux parties aériennes des arbres (feuilles, tiges, graines) ainsi que leur dynamique de transmission verticale (de l’arbre à ses descendants) et horizontale (émission de l’arbre vers l’atmosphère), en combinant des analyses d’écologie moléculaire et d’écophysiologie végétale. Le premier chapitre [P1] montre une stratification verticale des communautés fongiques et bactériennes foliaires au sein de la canopée du hêtre (Fagus sylvatica). Cette stratification est plus marquée chez les micro-organismes épiphytes que chez les endophytes, elle s’atténue au cours de la saison végétative chez les bactéries et semble être liée à la morphologie plutôt qu’à la physiologie foliaire. La stratification verticale des fonctions microbiennes est en cours d’analyse. Le deuxième chapitre [P2] met en évidence la présence de champignons dans les tissus internes des glands du chêne sessile (Quercus petraea), y compris l’embryon, suggérant que le microbiote peut être transmis verticalement de l’arbre mère à ses descendants et influencer la régénération forestière. Les glands contiennent en particulier plusieurs espèces de champignons pathogènes, en association avec leurs mycoparasites. Ces communautés fongiques varient significativement en fonction de l’arbre mère et de la population de chêne. Enfin, le troisième chapitre [P3] teste un prototype de mesure des flux d’émissions bactériennes au-dessus des couverts végétaux. Il montre que la moitié des espèces capturées dans l’atmosphère est présente sur la surface des feuilles et suggère que la composition des bioaérosols est fortement influencée par la plante cultivée dominante localement, la vigne (Vitis Vinifera). Des mesures complémentaires, incluant une plus large gamme d’habitats forestiers et non-forestiers, devront être réalisées pour mieux cerner l’origine des émissions, qui sont connues pour influencer le cycle de l’eau. Cette thèse apporte donc des éléments pour modéliser la dynamique et l’évolution du système arbre-microbiote-atmosphère, qu’il conviendra de renforcer et d’intégrer aux connaissances sur le système sol afin de répondre aux défis posés par le changement climatique<br>Trees interact with diverse microbial communities that influence their fitness and the functioning of terrestrial ecosystems. Unlike microorganisms associated with roots and soil, microorganisms that colonize the forest canopy are still poorly understood. The objective of this thesis is to better understand the functions of microorganisms associated with the aerial parts of trees (leaves, stems, seeds) as well as their vertical (from the plant to its offspring) and horizontal (emission from the plant to the atmosphere) transmission dynamics, by combining molecular ecology and plant ecophysiology analyses. The first chapter [P1] shows a vertical stratification of fungal and foliar bacterial communities within the beech canopy (Fagus sylvatica). This stratification is more pronounced for epiphytic microorganisms than for endophytes. It also decreases during the growing season in bacteria and appears to be related to morphology rather than foliar physiology. Vertical stratification of microbial functions is being analyzed. The second chapter [P2] highlights the presence of fungi in the internal tissues of the acorns of sessile oak (Quercus petraea), including the embryo, suggesting that the microbiota can be transmitted vertically from the mother tree to its offsprings and influence forest regeneration. Acorns contain in particular several fungal pathogens, in association with their mycoparasites. These fungal communities vary significantly depending on the mother tree and the oak population. Finally, the third chapter [P3] tests a prototype for measuring bacterial emission fluxes over plant cover. It shows that half of the species captured in the atmosphere are present on the leaf surface and suggests that the composition of bioaerosols is strongly influenced by the locally dominant cultivated plant, the grapevine (Vitis vinifera). Complementary measures, including a wider range of forest and non-forestry habitats, will have to be carried out to better understand the origin of emissions, which are known to influence the water cycle. This thesis therefore provides elements for modelling the dynamics and evolution of the tree-microbiota-atmosphere system, which will need to be strengthened and integrated into knowledge of the soil system in order to respond to the challenges raised by climate change
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Brine, A. "Direct sequence data transmission systems." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379274.

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Comley, Vivian Edward. "Aspects of synchronization in direct sequence spread spectrum systems." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355305.

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A serial search process achieved by reference code clock frequency offset suffers from a degraded autocorrelation function between the two codes because of the differing chip rates. In this thesis a computer simulation is used to investigate the code decorrelation, and the results are employed to obtain the mean acquisition time for the serial search process. The analysis is extended to include a CCD. type of matched filter following the integrate and dump detector, and to investigate the improvements in acquisition time that may be achieved over the simple serial search process if a search-lock strategy is employed. The effects of jitter and phase offset upon the error probability of the recovered data are investigated both theoretically and by measurement for the particular case of code modulation by sequence inversion keying. A tracking loop is presented that has been shown to maintain reference code phase offset to within ~ 0.01 chips under conditions where the noise on the communications link has made the recovered data unusable for most purposes. Finally, an application of spread spectrum techniques to small local area networks is presented, and a discussion of the effects of the crosscorrelation noise from the other user spreading codes upon the tracking loop's discriminator characteristic is given.
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Ruckstuhl, Andreas Franz. "Analysis of the T₂ emission spectrum by robust estimation techniques /." Zürich, 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11170.

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Books on the topic "Emission and transmission spectrum"

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Franz, Rosenberger, and United States. National Aeronautics and Space Administration., eds. X-ray transmission microscope development: Third semi-annual progress report, NASA contract NAS8-40185. Center for Microgravity and Materials Research, The University of Alabama in Huntsville, 1995.

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Franz, Rosenberger, and United States. National Aeronautics and Space Administration., eds. X-ray transmission microscope development: Third semi-annual progress report, NASA contract NAS8-40185. Center for Microgravity and Materials Research, The University of Alabama in Huntsville, 1995.

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Sanders, Geoffrey A. Emission spectrum measurements of a 3.5 GHz LTE hotspot. U.S. Department of Commerce, National Telecommunications and Information Administration, Institute of Telecommunication Sciences, 2015.

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Lamberti, Carlo, and Jeroen A. van Bokhoven. X-ray absorption and X-ray emission spectroscopy: Theory and applications. John Wiley & Sons, Inc., 2015.

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J, Hughes M., Cowell Michael, Hook Duncan R, and British Museum. Dept. of Scientific Research., eds. Neutron activation and plasma emission spectrometric analysis in archaeology: Techniques and applications. British Museum, 1994.

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Wheeler, M. L. Spread spectrum receiver electromagnetic interference (EMI) test guide. National Aeronautics and Space Administration, Marshall Space Flight Center, 1998.

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Bode, Andreas. Heat transfer, vapour bubble dynamics and sound emission in subcooled nucleate pool boiling. Shaker Verlag, 2004.

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Mariska, John T. The solar transition region. Cambridge University Press, 1992.

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Georgia Tech Research Institute. Electromagnetic Environmental Effects Branch. and United States. National Aeronautics and Space Administration., eds. Spread spectrum receiver electromagnetic interference (EMI) test guide: Final technical report, report no. A-5541F : contract no. H-28506D. Georgia Tech Research Institute, 1998.

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Witte, Robert A. Spectrum and network measurements. Prentice Hall, 1993.

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Book chapters on the topic "Emission and transmission spectrum"

1

Yao, Qiyang, Sheng Wang, Yao Chen, Yanchao Shao, and Xiaokun Fan. "A Signal Processing Approach for Fracture Inversion Technique Utilizing Acoustic Emission Signal in Shale Hydraulic Fracturing Experiment." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2417-8_6.

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AbstractIn order to detect the fracture information inside the material, solve the problem of static flaw detection and dynamic monitoring of the material, this paper studies the processing method of acoustic emission signal based on the active excitation signal of shale surface and the data output from hydraulic fracturing test. Event detection is the preliminary signal processing, to obtain the event information conveyed by acoustic emission signal and capture the information of shale internal materials carried in signal transmission. Sound source location is calculated by dividing the unit and fitting the signal source position. Both spectrum analysis and tomography are used to locate static natural fractures. Through the analysis of signal data, the positioning situation of different methods is compared. Based on experimental data from laboratory shale hydraulic fracturing, this study uses Julia language to construct a processing model for acoustic emission signals. Through the research context of this paper, we hope to provide reference for Julia language in the field of acoustic emission signal processing.
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Williams, David B., and C. Barry Carter. "The Energy-Loss Spectrum." In Transmission Electron Microscopy. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-2519-3_38.

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Zeng, Gengsheng Lawrence. "Transmission and Emission Tomography." In Medical Image Reconstruction. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05368-9_4.

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Pelphrey, Kevin A. "Positron-Emission Tomography." In Encyclopedia of Autism Spectrum Disorders. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1698-3_577.

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Pelphrey Harris, Kevin A. "Positron-Emission Tomography." In Encyclopedia of Autism Spectrum Disorders. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-91280-6_577.

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Williams, David B., and C. Barry Carter. "Everything Else in the Spectrum." In Transmission Electron Microscopy. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-2519-3_40.

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Hackenbroich, Gregor, and Fritz Haake. "Emission Spectrum of Random Lasers." In Anderson Localization and Its Ramifications. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45202-7_9.

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Wagatsuma, Kazuaki. "Spectrum in Atomic Emission Spectroscopy." In SpringerBriefs in Materials. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5946-1_13.

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Bailey, D. L., and B. F. Hutton. "Simultaneous Emission and Transmission Tomography." In Information Processing in Medical Imaging. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-7263-3_38.

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Petermann, K. "Longitudinal Mode Spectrum of Lasing Emission." In Laser Diode Modulation and Noise. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2907-4_3.

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Conference papers on the topic "Emission and transmission spectrum"

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Hosoda, Nobuaki, Takashi Murata, and Takayuki Misu. "Development of LED Lighting for Microalgae Propagation with Emission Spectrum Having Broader Emission Peaks." In 2024 IEEE Sustainable Smart Lighting World Conference & Expo (LS24). IEEE, 2024. https://doi.org/10.1109/ls2463127.2024.10882045.

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Glowacki, Arkadiusz, Christian Boit, Yoshiyuki Yokoyama, and Philippe Perdu. "Photon Emission Spectra of FETs as Obtained by InGaAs Detector." In ISTFA 2012. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.istfa2012p0123.

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Abstract In this work we present spectrally resolved photon emission microscopy (SPEM) measurements for short-channel FETs acquired through the backside of the Si substrate using InGaAs detector. Two spectrum resolution methods have been used: continuous using a prism and discrete using a set of interference band-pass filters. The photon emission (PE) spectra have been corrected for the background / noise of the detector; they have been calibrated with respect to the system optical transmission function and corrected for the absorption on free carriers in the remaining layer of Si substrate. We discuss all the standardization aspects thoroughly as they are crucial in order to obtain correct device-intrinsic PE spectral information. Finally, we present the spectral results for FET devices operated in various operating conditions.
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Sushentsov, N. I., S. A. Stepanov, D. E. Shashin, and E. V. Mikheeva. "THE STUDY OF THE TRANSMISSION SPECTRA AND REFRACTIVE INDEX OF TIO2 THIN FILMS SYNTHESIZED BY MAGNETRON SPUTTERING." In Plasma emission electronics. Buryat Scientific Center of SB RAS Press, 2018. http://dx.doi.org/10.31554/978-5-7925-0524-7-2018-201-203.

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Palmer, A. J., S. Y. Matrosov, T. Uttal, et al. "Combined Infrared Emission Spectra and Radar Reflectivity Studies of Cirrus Clouds." In Optical Remote Sensing of the Atmosphere. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/orsa.1991.owd2.

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This paper reports the first collaborative application of a unique prism infrared spectrograph1-3 with other cloud sensing instrumentation directed to understanding the longwave radiative properties of cirrus clouds. The primary measurement reported here is the slope of the emission spectrum of a cirrus cloud in the 10-12 μm atmospheric transmission window. This measurement together with simultaneous cloud radar reflectivity and temperature measurements were used to infer cloud ice crystal size.
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Parrassin, Thierry, Sylvain Dudit, Michel Vallet, Antoine Reverdy, and Hervé Deslandes. "Introduction of Spectral Mapping through Transmission Grating, Derivative Technique of Photon Emission." In ISTFA 2014. ASM International, 2014. http://dx.doi.org/10.31399/asm.cp.istfa2014p0115.

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Abstract By adding a transmission grating into the optical path of our photon emission system and after calibration, we have completed several failure analysis case studies. In some cases, additional information on the emission sites is provided, as well as understanding of the behavior of transistors that are associated to the fail site. The main application of the setup is used for finding and differentiating easily related emission spots without advance knowledge in light emission mechanisms in integrated circuits.
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Hu, Z., J. W. R. Tabosa, and H. J. Kimble. "Nonlinear spectroscopy of cold atoms." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tujj3.

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Nonlinear spectroscopy of cold atoms has recently been reported for a sample of cesium atoms confined in a magnetooptical trap.1,2 In particular, we report measurements of the spectral response of the cold sample to a weak probe beam for a range of detunings and power for the saturating trapping beams. Transmission spectra for the probe beam reveal the presence of broad absorption and gain features as well as narrow resonances. The power dependence of the broad part of the spectrum can be reasonably well described by earlier work for two-level atoms in a strong field.3 However, narrow dispersive shaped features around the frequency of the trapping beams are also observed and can have appreciable single pass gain (&gt;20%). An exploration of the correlation between the narrow spectroscopic features and the mechanical properties of the atomic sample leads to the observation of both positive and negative radiation pressure associated with stimulated absorption from and emission to the probe beam.
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N. S. da Silva, Maise, Rafael S. Salles, Alexandre Degan, Carlos A. Duque, and Paulo F. Ribeiro. "Investigation of Harmonic Current Aggregation in the TBE/Eletronorte Transmission System." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1725.

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Harmonic distortions are not new problems in electrical power systems. However, electrical networks have undergone several changes in recent decades, such as the wide range of electronic devices (converters, control devices, etc.), and those equipment produce emission of harmonic currents. The investigation of the contribution of several sources of harmonics in power systems is essential, considering that it is a problem of power quality that cannot be neglected. Thispaper aims to investigate the aggregation of harmonic currents in a 230kV TBE/Eletronorte system. For this, the transmission system was modeled using MATLAB/Simulink software with the typical values provided by TBE. A vectorial analysis was performed for the three-phase system and a sum analyzes of harmonics from different sources on Phase A, to estimate the influence of those current sources on Castanhal and Guama buses, when a harmonic spectrumis present on Vila do Conde and Utinga buses. In both analyzes, a phase angle spectrum of 10 and 20 degrees was applied in the harmonic source of Utinga. The summation analyzes proved to be useful because it can estimate values that harmonic currents can assume, for different conditions, and can be very useful in the planning stage to avoid estimation errors.
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Langlois, Patrick, and Michel Piché. "Self-mode-locked semiconductor laser in a ring cavity." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cpd1.3.

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We report on the generation of short (2 ps) pulses directly from a self-mode-locked semiconductor amplifier inserted in a ring cavity. The amplifier is in fact a superluminescent diode consisting of a 500 mm long double quantum-well InGaAlAs ridge waveguide with strained InGaAs active layers ; an angled stripe geometry provides a low coherence emission with a broad spectrum centered near 855 nm. The amplifier is placed in a ring cavity with three gold minors and a 83% transmission output coupler. Collimation of the laser output and careful alignment of the cavity mirrors allows laser emission with a threshold bias current Ith near 46 mA. Self-mode locking is achieved when the dc bias current is set at ~1.2 Ith, and when the cavity is slightly misaligned. Figures 1 and 2 show typical non-colinear autocorrelation traces and optical spectra of the pulses circulating in the clockwise (cw) and counterclockwise (ccw) directions. The counterpropagating pulses have similar temporal profiles with durations from 2 to 6 ps (after deconvolution) and characterized by a weak pedestal that falls to zero. Remarkably, the pulse respective optical spectra are different, as the spectrum of the ccw pulse has a 2.9 nm bandwidth peaked at 864 nm, whereas that of the cw pulse is peaked near 867 nm with a bandwidth of 0.9 nm. Both circulating pulses have a time-bandwidth product exceeding several times the Fourier-transformed limit, which suggests that they can be compressed to subpicosecond durations.
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Handke, Miroslaw, Anna Stoch, and Witold Jastrzebski. "Transmission, emission, and specular-reflection FTIR spectra of the thin forsterite (MG2SiO4) film." In Luebeck - DL tentative, edited by Herbert M. Heise, Ernst H. Korte, and Heinz W. Siesler. SPIE, 1992. http://dx.doi.org/10.1117/12.56455.

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Mason, J. A., A. C. Tolchard, A. C. N. Towner, et al. "A Tomographic Segmented Gamma Scanner for the Measurement of Decommissioning Wastes." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4658.

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The ANTECH Tomographic Segmented Gamma Scanner (TSGS) combines: a) Conventional Segmented Gamma Scanner (SGS) analysis (compliant to ASTM C1133-96), b) Tomographic Gamma Scanner (TGS) analysis providing both attenuation and source distribution maps (effectively 3D images) of the interior of drums, and c) Isotopic ratio analysis for uranium and transuranic elements using PC-FRAM. In SGS mode the drum is rotated and scanned segment by segment along its height. A two-pass measurement, one for transmission and one for emission, results in two spectra for each segment. An assay is made by measuring the intensity of a characteristic gamma ray from each nuclide. Corrections are made for count rate-related losses and attenuation by the item (using a transmission source). Calibration standards are used to provide the relationship between observed gamma-ray intensity and nuclide content. On completion, count rates are summed, and mass values for the nuclides of interest in the entire drum are calculated based on comparisons to appropriate calibration materials. In the case of SGS, the matrix is assumed to be homogeneous on a segment by segment basis. TGS involves measuring drums in segments as for SGS. However, in the case of TGS, while the drum is rotated, it is also moved in the horizontal direction (translated). Also, instead of taking a single large spectrum for each segment, 150 separate spectra are taken as the drum rotates and is translated. These 150 spectra are obtained both for transmission and for emission measurements. The 150 spectra taken for transmission constitute a set of data that can be solved to yield the distribution, or map of attenuation coefficients throughout the segment of the sample or drum. The measurement equations are over specified and the solution uses a maximum likelihood analysis. This results in the determination of a map (after a geometric transformation) of attenuation coefficients in a rectangular grid suitably superimposed on each segment. The attenuation map enables the operator to ‘visulise’ the variation of the density (governed by the collimator size and voxe resolution) in regions of the drum. This serves a non-destructive examination function similar to ‘real time radiography’ but with lower resolution. For the analysis of the emission data, the additional information obtained from the transmission data allows the emission data to be corrected for attenuation. This attenuation correction is the essential and important characteristic of TGS measurements not present in other gamma-ray measurement systems. For the first time in the case of the TGS, the map of attenuation is used to correct the measured source distribution in the matrix (segment by segment). The TSGS extends the range of gamma-ray measurement technology, as it is able to correctly determine the attenuation corrected radionuclide inventory in heterogeneous matrices where previous techniques such as the SGS are only applicable to homogeneous matrices. In the case of TGS a single calibration based on a non-interfering or empty matrix is made and then corrections relating back to this non-interfering matrix are made using the attenuation information determined from the transmission scan.
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Reports on the topic "Emission and transmission spectrum"

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Anderson, David, and David Cohen. Digital emission spectrum model. Institute for Telecommunication Sciences, 1992. https://doi.org/10.70220/f7xn7gd7.

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Anderson, David, and David Cohen. Digital Emission Spectrum Model. Institute for Telecommunication Sciences, 1993. https://doi.org/10.70220/m2d3g7ng.

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Wang, Tzu-Fang. Emission and transmission gamma-ray computed tomography. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/491926.

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Sanders, Geoffrey, Robert Achatz, John Carroll, Frank Sanders, and Robert Sole. Emission Spectrum Measurements of a 3.5 GHz LTE Hotspot. Institute for Telecommunication Sciences, 2015. https://doi.org/10.70220/lvdv952l.

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Llacer, J. Transmission Secondary Emission from Thin Films of Alkali Halides. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1453861.

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Clapsaddle, Craig, Amy Marshall, and Roy Neulicht. L41023 Gas Transmission Industry Experience of Turbine Parametric Emission Monitoring Systems (PEMS). Pipeline Research Council International, Inc. (PRCI), 1999. http://dx.doi.org/10.55274/r0010579.

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The use of PEMS to meet monitoring requirements offers the potential for significant cost savings and reduced manpower needs for operation and maintenance over the use of traditional continuous emission monitoring systems (CEMS). However, a single source of pertinent information on available systems does not exist. The two main objectives for this study were to: evaluate and document the gas transmission industry's experience with PEMS for gas turbines, and provide a comprehensive information base to assist future industry user's decision-making regarding PEMS use.
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McGrath, Panek, and McCarthy. L52356 Nomenclature for Natural Gas Transmission and Storage Greenhouse Gas Emissions. Pipeline Research Council International, Inc. (PRCI), 2012. http://dx.doi.org/10.55274/r0010015.

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A compilation of harmonized terminology and standardized nomenclature for natural gas transmission and storage (T and S) equipment and operations associated with greenhouse gas (GHG) emission sources and emission estimates. Criteria for natural gas industry (per segments in 40 CFR 98) for GHG inventories are also addressed. This living document is intended to be a detailed reference for practitioners and managers developing GHG inventories. The document's primary purpose is to support T and S facilities GHG emissions reporting for 40 CFR 98 Mandatory Greenhouse Gas Reporting�; however, information is also provided to support the development of GHG emission inventories for other purposes. Standardized nomenclature used in the estimation and reporting of greenhouse gas emissions and provide a single living document to be used as a reference to enhance consistency within the natural gas industry. This document may also serve to form a more accurate basis for consistent reporting of emission sources through an enhanced common understanding of industry and regulatory terminology, synonyms and sector boundaries. Consistent terminology will promote higher fidelity emission inventories and focus subsequent EPA control strategies and requirements.
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McCarthy, James. PR-312-18209-E03 GHG Reporting Transmission Pipeline Blowdown Data Review and Emission Factor Trends. Pipeline Research Council International, Inc. (PRCI), 2021. http://dx.doi.org/10.55274/r0012109.

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Previous project reports and a white paper provided background and analysis of pipeline blowdown data reported to under under Subpart W of the GHG Reporting Program. Pipeline blowdown data reported for the 2018 calendar year released by EPA in late 2019 were include in a June 2020 version of this white paper. Since data pipeline blowdown data trends are of interest, this white paper updates the June 2020 White Paper (which included EPA data through the 2018 reporting year) to add 2019 data released by EPA in November 2020. Pipeline blowdown emission factors are relatively consistent from year to year based on 2017 through 2019 data.
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McCarthy, James. PR-312-18209-E02 GHG Reporting - Transmission Pipeline Blowdown Data Review and Emission Factor Trends. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011686.

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PRCI reports have summarized GHGRP data and improved emissions factors based on the data. Pipeline blowdown emissions reporting was added to the GHGRP in 2016 and only one year of quality data (2017 reporting year) was available for the PRCI reports (versus 6 years of data compiled for compressor stations). To assess additional data, pipeline blowdown emissions for 2018 (released by EPA in late 2019) were compiled and analyzed. The data shows similar trends for 2017 and 2018, as well as consistency with the historical emission factor for pipeline blowdown emissions from the 1996 EPA/GRI Study.
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McGrath, Tom, Wendy Coulson, and James McCarthy. PR-312-18209-E01 Methane Emissions from Compressors in Transmission and Storage Subpart W Sources. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011630.

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This white paper provides a step-by-step review of the methodology and data sources for development of compressor methane emission factors (EFs), and develops updated EFs based on Subpart W compressor measurement and leak survey data. The methodology is analogous to that used in a previous GRI/EPA Methane Emissions Study. In all cases, updated T and S compressor emission factors are lower than historical emission factors, and significantly lower in some cases. The updated emission factors provide a current best-estimate of T and S compressors emissions, and can be used to update emission estimates in the EPA Annual GHG Inventory Report, and to provide an alternative method for the annual estimate of compressor emissions for Subpart W.
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