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Bibliografias temáticas / High Spectral Resolution

Literatura científica selecionada sobre o tema "High Spectral Resolution"

Autor: Grafiati

Publicado: 22 de junho de 2024

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Artigos de revistas sobre o assunto "High Spectral Resolution":

1

Meek, R. A., e A. A. Vassiliou. "Characterizing three‐dimensional wavefields with high‐resolution spectra". GEOPHYSICS 57, n.º 4 (abril de 1992): 522–31. http://dx.doi.org/10.1190/1.1443266.

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Three‐dimensional spectra (frequency‐x‐wavenumber‐y‐wavenumber or [Formula: see text] spectra) can be used to determine the frequency content, velocity, and direction of waves entering an array of receivers. This information is important in detecting aliasing problems, understanding coherent noise, designing arrays, and determining parameters for coherent noise filters. Because of the limited spatial dimensions of most arrays the discrete Fourier transform produces an estimate of the three‐dimensional (3-D) spectrum with severe wavenumber distortion. We extend a 2-D hybrid spectral estimation method to three dimensions by combining a temporal Fourier transform with a spatial 2-D maximum entropy spectral estimation technique. The method produces [Formula: see text] spectra with higher wavenumber resolution and less spectral distortion than corresponding 3-D Fourier spectra. The 2-D maximum entropy spectral estimation algorithm uses a sequence of Fourier transforms to extrapolate the estimated autocorrelation function of the data. We assume the wavenumber spectrum of the data comprises a sum of a few poles. Field and synthetic data are used to demonstrate how 3-D wavefields can be characterized with this method of spectral analysis. From these results we conclude that the method gives excellent wavenumber resolution but performs poorly in detecting small signals in the presence of high amplitude signals. We feel this limitation is not serious for characterizing strong amplitude coherent energy recorded by an array of receivers.

2

Chen, Lin-sen, Tao Yue, Xun Cao, Zhan Ma e David J. Brady. "High-resolution spectral video acquisition". Frontiers of Information Technology & Electronic Engineering 18, n.º 9 (setembro de 2017): 1250–60. http://dx.doi.org/10.1631/fitee.1700098.

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3

Chouza, Fernando, Benjamin Witschas e Oliver Reitebuch. "Heterodyne high-spectral-resolution lidar". Applied Optics 56, n.º 29 (4 de outubro de 2017): 8121. http://dx.doi.org/10.1364/ao.56.008121.

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4

Dahlhaus, R. "Nonparametric high resolution spectral estimation". Probability Theory and Related Fields 85, n.º 2 (junho de 1990): 147–80. http://dx.doi.org/10.1007/bf01277980.

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5

Allen, G., J. J. Remedios, D. A. Newnham, K. M. Smith e P. S. Monks. "High resolution mid-infrared cross-sections for peroxyacetyl nitrate (PAN) vapour". Atmospheric Chemistry and Physics Discussions 4, n.º 5 (22 de setembro de 2004): 5655–81. http://dx.doi.org/10.5194/acpd-4-5655-2004.

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Abstract. Absorption spectra of peroxyacetyl nitrate (PAN, CH3C(O)OONO2) vapour at room temperature (295 K) have been measured in the mid-infrared range, 550–2200 cm−1 (18.2–3.33 µm), using a Fourier transform infrared spectrometer at instrument resolutions of 0.25 and 0.03 cm−1 (unapodised). Both cross-section data and integrated absorption intensities for the five principal bands in the PAN spectra in this spectral range have been derived from fourteen separate PAN transmission spectra measurements. Band intensities and band centre absorptivities are also reported for four weaker PAN absorption bands in the mid infrared for the first time. These observations are the highest spectral resolution measurements of PAN bands recorded in the infrared to date. For three of the five strongest bands, the absolute integrated absorption intensities are in excellent agreement with previous studies. A 4.8% lower integrated intensity was found for the 1741 cm−1 νas (NO2) PAN absorption band, possibly as a result of the removal in this work of spectra affected by subtle acetone contamination, while a 10.6% higher intensity was determined for the 1163 cm−1 ν (C-O) absorption band. No direct effects of spectral resolution were observed. The improved accuracy of these absorption cross-sections will allow more accurate investigations of PAN using infrared spectroscopy, particularly for remote sensing of PAN in the atmosphere.

6

Conrads, T. P., V. A. Fusaro, S. Ross, D. Johann, V. Rajapakse, B. A. Hitt, S. M. Steinberg et al. "High-resolution serum proteomic features for ovarian cancer detection." Endocrine-related cancer 11, n.º 2 (junho de 2004): 163–78. http://dx.doi.org/10.1677/erc.0.0110163.

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Serum proteomic pattern diagnostics is an emerging paradigm employing low-resolution mass spectrometry (MS) to generate a set of biomarker classifiers. In the present study, we utilized a well-controlled ovarian cancer serum study set to compare the sensitivity and specificity of serum proteomic diagnostic patterns acquired using a high-resolution versus a low-resolution MS platform. In blinded testing sets, the high-resolution mass spectral data contained multiple diagnostic signatures that were superior to the low-resolution spectra in terms of sensitivity and specificity (P<0.00001) throughout the range of modeling conditions. Four mass spectral feature set patterns acquired from data obtained exclusively with the high-resolution mass spectrometer were 100% specific and sensitive in their diagnosis of serum samples as being acquired from either unaffected patients or those suffering from ovarian cancer. Important to the future of proteomic pattern diagnostics is the ability to recognize inferior spectra statistically, so that those resulting from a specific process error are recognized prior to their potentially incorrect (and damaging) diagnosis. To meet this need, we have developed a series of quality-assurance and in-process control procedures to (a) globally evaluate sources of sample variability, (b) identify outlying mass spectra, and (c) develop quality-control release specifications. From these quality-assurance and control (QA/QC) specifications, we identified 32 mass spectra out of the total 248 that showed statistically significant differences from the norm. Hence, 216 of the initial 248 high-resolution mass spectra were determined to be of high quality and were remodeled by pattern-recognition analysis. Again, we obtained four mass spectral feature set patterns that also exhibited 100% sensitivity and specificity in blinded validation tests (68/68 cancer: including 18/18 stage I, and 43/43 healthy). We conclude that (a) the use of high-resolution MS yields superior classification patterns as compared with those obtained with lower resolution instrumentation; (b) although the process error that we discovered did not have a deleterious impact on the present results obtained from proteomic pattern analysis, the major source of spectral variability emanated from mass spectral acquisition, and not bias at the clinical collection site; (c) this variability can be reduced and monitored through the use of QA/QC statistical procedures; (d) multiple and distinct proteomic patterns, comprising low molecular weight biomarkers, detected by high-resolution MS achieve accuracies surpassing individual biomarkers, warranting validation in a large clinical study.

7

Sato, Harumi, Masahiko Shimoyama, Taeko Kamiya, Toru Amari, Slobodan Šašiç, Toshio Ninomiya, Heinz W. Siesler e Yukihiro Ozaki. "Near Infrared Spectra of Pellets and Thin Films of High-Density, Low-Density and Linear Low-Density Polyethylenes and Prediction of Their Physical Properties by Multivariate Data Analysis". Journal of Near Infrared Spectroscopy 11, n.º 4 (agosto de 2003): 309–21. http://dx.doi.org/10.1255/jnirs.376.

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The aim of the present study is to investigate in detail the near infrared (NIR) spectra of the three types of polyethylene, linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE) and high-density polyethylene (HDPE), and to develop calibration models that predict their physical properties such as density, crystallinity and melting point. The effects of spectral resolution on the classification and the prediction of density for the three types of PE have been investigated. Furthermore, the NIR spectral differences among LLDPE, LDPE and HDPE have been explored in more detail using 2 cm−1 resolution. Principal component analysis (PCA) has been performed to differentiate the 18 samples of PE. They are classified into three groups, LLDPE, LDPE and HDPE, by a score plot of the PCA Factor 1 versus 3 based on the NIR spectra pretreated by multiplicative scatter correction (MSC). The 2 cm−1 spectral resolution yields a slightly better result for the classification. Partial least squares (PLS) regression has been applied to the NIR spectra after MSC to propose calibration models that predict the density, crystallinity and melting point of HDPE, LDPE and LLDPE. The correlation coefficient for the density was calculated to be 0.9898, 0.9928, 0.9925 and 0.9872 for the spectra obtained at 2, 4, 8 and 16 cm−1 resolutions, respectively, and the root mean square error of cross validation ( RMSECV) was found to be 0.0021, 0.0018, 0.0018 and 0.0023 g cm−3, respectively. It has been found that the correlation coefficient and RMSECV for the prediction of the density and crystallinity change little with the spectral resolution. However, for the prediction of melting point, the higher resolutions (2 and 4 cm−1 resolution) provide slightly better results than the lower resolutions. NIR transmission spectra of thin films of LLDPE, LDPE and HDPE have also been investigated, and calibration models for predicting their density have been developed for the film spectra.

8

Martinez, Zorayda, Simon Gazagnes e Danielle A. Berg. "Instrumental Effects of Lyα Properties in CLASSY and Implication for HETDEX and JWST". Research Notes of the AAS 7, n.º 10 (3 de outubro de 2023): 205. http://dx.doi.org/10.3847/2515-5172/acfe7f.

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Abstract In this work, we quantify the effects of spectral resolution (R) on the measured Lyα properties and determine the robustness of Lyα trends measured with different spectrographs. We select 9 galaxies with diverse Lyα properties from the COS Legacy Archive Spectroscopic SurveY and measure the equivalent width and peak velocities of their Lyα profiles from their high-resolution spectra (R ∼ 4225–15000). We downgrade these spectra to several lower resolutions (R ∼ 800–3500) and re-measure the Lyα properties. Using these values, we derive the systematic errors and investigate the robustness of Lyα properties as a function of spectral resolution. We find that equivalent width can be robustly measured at low R. However, the minimal spectral resolution required to obtain robust measurements of the Lyα peak velocities is R ≳ 2600 (Δv = 115 km s−1).

9

Qajar, Ch O., S. B. Kazymova, M. R. Menzeleyev e A. S. Gasanova. "Low Resolution Rotational Spectra of Phenol". Applied Physics Research 10, n.º 6 (30 de novembro de 2018): 77. http://dx.doi.org/10.5539/apr.v10n6p77.

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The modeling of low-resolution (LR) microwave spectra of phenol C6H5OH molecule has been provided in the frequency regions of 0-700 GHz basing on high-resolution (HR) microwave spectral data. The frequency ranges of most intensive absorption level of low-resolution microwave spectra determined. The most intensive spectral lines forming spectra extremums are developed. The recommendations related to perspectives of practical use of achieved results are given.

10

Sadygov, Rovshan G. "High-Resolution Mass Spectrometry for In Vivo Proteome Dynamics using Heavy Water Metabolic Labeling". International Journal of Molecular Sciences 21, n.º 21 (22 de outubro de 2020): 7821. http://dx.doi.org/10.3390/ijms21217821.

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Cellular proteins are continuously degraded and synthesized. The turnover of proteins is essential to many cellular functions. Combined with metabolic labeling using stable isotopes, LC–MS estimates proteome dynamics in high-throughput and on a large scale. Modern mass spectrometers allow a range of instrumental settings to optimize experimental output for specific research goals. One such setting which affects the results for dynamic proteome studies is the mass resolution. The resolution is vital for distinguishing target species from co-eluting contaminants with close mass-to-charge ratios. However, for estimations of proteome dynamics from metabolic labeling with stable isotopes, the spectral accuracy is highly important. Studies examining the effects of increased mass resolutions (in modern mass spectrometers) on the proteome turnover output and accuracy have been lacking. Here, we use a publicly available heavy water labeling and mass spectral data sets of murine serum proteome (acquired on Orbitrap Fusion and Agilent 6530 QToF) to analyze the effect of mass resolution of the Orbitrap mass analyzer on the proteome dynamics estimation. Increased mass resolution affected the spectral accuracy and the number acquired tandem mass spectra.

Mais fontes

Teses / dissertações sobre o assunto "High Spectral Resolution":

1

Brierley, Mita Leela. "High Resolution Spectral Models for Globular Clusters". Thesis, University of Canterbury. Physics and Astronomy, 2010. http://hdl.handle.net/10092/4963.

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This thesis covers the development of high-resolution model spectra of simple-stellar-populations (SSP) to be used in the measurement of the ages, metallicities and chemical abundances of unresolved extragalactic globular clusters (GCs). The models are compared to low- and high-resolution spectra of GCs in the Milky Way and M31 galaxies, whose properties are already known, to establish the effectiveness of both the SSP spectral grid and of the direct spectral fitting procedure employed in this work. The model SSP spectra were created using Dotter et al. (2007) isochrones, populated using the flux derived from a grid of stellar spectra, weighted by the Kroupa (2001) mass function. Models with varying mass loss from the red giant branch and varying numbers of He-burning stars were generated. The spectral grid currently covers a parameter range of 2 to 15 Gyrs in age, and -2.5 to 0 dex in [Fe/H] at an [alpha/Fe] of +0.4 dex. Metallicities derived for Milky Way GCs from Lick index comparisons to the model grid are in good agreement with values in the literature. The stellar spectral grid, from which the GC spectra are generated, has been created using ATLAS9 and SYNTHE. The spectra are at a resolution of R = 100,000 and cover a wavelength range from 3000 - 9000 Angstroms. Extensive work was undertaken in creating appropriate lists of atomic and molecular transition oscillator strength (log gf) values for this spectral grid. An automated program was created to alter the strengths of millions of atomic transition lines in the Kurucz atomic line lists to fit a model spectrum of appropriate parameters to that of the red-giant star Arcturus and to the Solar spectrum at shorter wavelengths (3000 - 3727 Angstroms). Comparisons to these observed spectra were made manually for several molecular lines and band-heads, and log gf values changed en-mass for all the lines of a given molecular species. The SSP spectra were compared to low-resolution spectra of Milky Way GCs. Integrated-light spectra of a large number of Galactic GCs were obtained from three sources: the Schiavon et al. (2005) Library of Integrated Spectra of Galactic Globular Clusters, taken using the Ritchey-Chretien spectrograph on the Blanco 4m telescope at Cerro Tololo Inter-American Observatory; spectra obtained through private communication with M. Bessell using the Double Beam Spectrograph on the 2.3m telescope at Siding Springs Observatory; and spectra obtained using the Robert Stobie Spectrograph on the 11m diameter Southern African Large Telescope. With resolutions of 1500 to 2800, abundances of individual elements could not be determined, but overall ages and metallicities were derived. The model spectra were fitted to the observed spectra using a Chi^2 minimisation procedure over large wavelength regions to fully utilise the information available in the spectra. Derived metallicity values were in agreement with literature values. However, age determinations were not consistent with those derived from photometric methods and had large associated uncertainties. The lack of age information in the spectra at such resolutions is a similar result to that found by other studies using the Schiavon data (eg. Mendel et al., 2007; Koleva et al., 2008). The SSP spectral grid was used to determine ages, metallicities and individual elemental abundances of three clusters (GCM06, GC5 and GC10) in the outer halo of M31. High-resolution spectra from Keck-HIRES were obtained through private communication with D. Forbes. Age and metallicity determinations were made simultaneously by fitting un-blended FeI lines and the H-beta and H-gamma lines. Diagnostic analysis (such as that done by Colucci et al., 2009) and simultaneous fitting of the FeI lines alone gave unrealistic age values that tended towards the lower limits (2 Gyrs) of the age grid. The age and metallicities derived in this work for these clusters are consistent with those found by Alves-Brito et al. (2009) using the same data. Abundances of a number of elements were derived from the high-resolution spectra. An overall enhancement of alpha-elements (from measurements of Ca, Si and Ti) was seen in all three clusters ([alpha/Fe] = 0.67 +/- 0.2, 0.63 +/- 0.2 and 0.5 +/- 0.2 dex for clusters GCM06, GC5 and GC10 respectively) which is greater than that found for other M31 GCs (Puzia et al., 2005; Colucci et al., 2009). A depletion in Mg compared to the other alpha-elements is seen, in accordance with patterns seen in both Milky Way and M31 GCs (Gratton et al., 2004; Colucci et al., 2009). All three clusters show varying levels of enhancements and depletion in the other measured elements (C, Sc, V, Cr, Mn, Ni, Ba), none of which follow the trends seen in Milky Way clusters. Comparisons to high-resolution spectra of Milky Way GCs, for which abundance ratios are known from the measurement of individual stars, need to be made to establish the accuracy of this elemental-abundance analysis. Overall, the system presented in this thesis is well designed to be used in the analysis of integrated-light spectra from distant, unresolved GCs. The uncertainties in the derived ages are still larger than desired, but the metallicity determination is very consistent when tested against clusters of known metallicities.

2

Dawsey, Martha Wallis. "Investigation into High Spectral Resolution Lidar Technologies". Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/306986.

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The Intergovernmental Panel on Climate Change (IPCC) found in their 2007 report that aerosol radiative forcing contributed larger uncertainties to estimates affecting future climate change than any other radiative forcing factor. Lidar is a tool with which this uncertainty can be reduced, increasing our understanding of the impact of aerosols on climate change. Lidar, or laser radar, is a monostatic active remote sensing technique used to measure aerosols and particulates in the atmosphere, with accuracies comparable to in-situ measurements (Russell 2002). High Spectral Resolution Lidar (HSRL) systems use a narrow band filter to spectrally separate Doppler broadened aerosol and molecular back-scattered return signals, which allows for range resolved profiles of aerosol extinction and backscatter. The narrow band filter is a key component, for which two novel approaches are currently being used: NASA Langley Research Center has implemented a wide-angle Michelson interferometer in the second version of their airborne HSRL, and Montana State University is using a spherical Fabry-Perot interferometer in a ground based HSRL. In this research, a comprehensive comparative analysis of these two interferometric filters is performed, the result of which is a methodology for the design of narrow band filters for HSRL systems. The techniques presented identify the critical components and analyze the performance of each filter based on the spectral and angular properties, as well as the efficiency.

3

Hoffman, David Swick. "Confocal Fabry-Perot interferometer based high spectral resolution LIDAR". Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/hoffman/HoffmanD1212.pdf.

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A high spectral resolution lidar (HSRL), which has been developed at Montana State University, utilizes a confocal Fabry-Perot interferometer (CFP) to separate aerosol and molecular lidar returns for the purpose of atmospheric aerosol observation. The CFP is actively frequency locked to the laser-transmitter via a novel frequency modulation based technique. 532 nm second harmonic light from a frequency doubled Nd:YAG injectionseeded, pulsed laser is directed vertically into the atmosphere. Light backscattered by the atmosphere is collected using a commercial Schmidt-Cassegrain telescope. The secondharmonic return signal is mode matched into a tunable CFP interferometer with a free spectral range of 7.5 GHz and a finesse of 50.7 (312) at 532 nm (1064 nm) placed in the optical receiver for spectrally filtering the molecular and aerosol return signals. The light transmitted through the CFP is used to monitor the aerosol return signal while the light reflected by the CFP is used to monitor the molecular return signal. Data collected with the HSRL are presented and inversion results are compared to those from a co-located solar radiometer, demonstrating the successful operation of the instrument. The HSRL presented in this dissertation provides an important means to study atmospheric aerosols, which are the largest source of uncertainty in current global climate models. Additionally, the novel frequency locking technique allows for the future development of multi-wavelength HSRL instruments, and the robustness of the frequency locked optical filter allows for the deployment of future air and space based HSRL instruments.

4

FARINELLO, PAOLO. "Solid-State Lasers for High Spectral Resolution Lidar Applications". Doctoral thesis, Università degli studi di Pavia, 2017. http://hdl.handle.net/11571/1203268.

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5

Cohen, Jacob Arthur. "Measuring the electric field of picosecond to nanosecond pulses with high spectral resolution and high temporal resolution". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37179.

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We demonstrate four experimentally simple methods for measuring very complex ultrashort light pulses. Although each method is comprised of only a few optical elements, they permit the measurement of extremely complex pulses with time-bandwidth products greater than 65,000. First, we demonstrate an extremely simple frequency-resolved-optical gating (GRENOUILLE) device for measuring the intensity and phase of pulses up to ~20ps in length. In order to achieve the required high spectral resolution and large temporal range, it uses a few-cm-thick second harmonic-generation crystal in the shape of a pentagon. This has the additional advantage of reducing the device's total number of components to three. Secondly, we introduce a variation of spectral interferometry (SI) using a virtually imaged phased array and grating spectrometer for measuring long complex ultrashort pulses up to 80 ps in length. Next, we introduce a SI technique for measuring the complete intensity and phase of relatively long and very complex ultrashort pulses. It involves making multiple measurements using SI (in its SEA TADPOLE variation) at numerous delays, measuring many temporal pulselets within the pulse, and concatenating the resulting pulselets. Its spectral resolution is the inverse delay range--many times higher than that of the spectrometer used. The waveforms were measured with ~ fs temporal resolution over a temporal range of ~ns and had time-bandwidth products exceeding 65,000, which to our knowledge is the largest time-bandwidth product ever measured with ~fs temporal resolution. Finally, we demonstrate a single-shot measurement technique that temporally interleaves hundreds of measurements with ~fs temporal resolution. It is another variation of SI for measuring the complete intensity and phase of relatively long and complex ultrashort pulses in a single shot. It uses a grating to introduce a transverse time delay into a reference pulse which gates the unknown pulse by interfering it at the image plane of an imaging spectrometer. It provided ~125 fs temporal resolution and a temporal range of 70 ps using a low-resolution spectrometer.

6

Appadoo, Dominique R. T. (Dominique Rupert Thierry) 1964. "Spectral simplification techniques for high resolution fourier transform spectroscopic studies". Monash University, School of Chemistry, 2002. http://arrow.monash.edu.au/hdl/1959.1/7746.

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7

Karaman, Ersin. "Road Network Extraction From High-resolution Multi-spectral Satellite Images". Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615362/index.pdf.

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In this thesis, an automatic road extraction algorithm for multi-spectral images is developed. The developed model extracts elongated structures from images by using edge detection, segmentation and clustering techniques. The study also extracts non-road regions like vegetative fields, bare soils and water bodies to obtain more accurate road map. The model is constructed in a modular approach that aims to extract roads with different characteristics. Each module output is combined to create a road score map. The developed algorithm is tested on 8-band WorldView-2 satellite images. It is observed that, the proposed road extraction algorithm yields 47 % precision and 70 % recall. The approach is also tested on the lower spectral resolution images with four-band, RGB and gray level. It is observed that the additional four bands provide an improvement of 12 % for precision and 3 % for recall. Road type analysis is also in the scope of this study. Roads are classified into asphalt, concrete and unpaved using Gaussian Mixture Models. Other linear objects such as railroads and water canals may also be extracted by this process. An algorithm that classifies drive roads and railroads for very high resolution images is also investigated. It is based on the Fourier descriptors that identify the presence of railroad sleepers. Water canals are also extracted in multi-spectral images by using spectral ratios that employ the near infrared bands. Structural properties are used to distinguish water canals from other water bodies in the image.

8

Polehampton, Edward. "The ISO LWS high resolution spectral survey towards Sagittarius B2". Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249161.

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9

Martinazzo, Michele. "Cloud optical properties parameterizations for infrared high spectral resolution fast codes". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21747/.

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Lo scopo principale di questo lavoro di tesi è quello di produrre un set di parametrizzazioni analitiche per le proprietà ottiche delle nubi e degli aerosoli, utili per essere implementate in un codice veloce di trasferimento radiativo. Il codice veloce da noi preso in considerazione è sigma-IASI-as. Allo stato attuale, questo modello incorpora delle routines di Mie, le quali vengono sfruttate per il calcolo dello spessore ottico in presenza di nubi o aerosoli. Inoltre il codice sfrutta l'approssimazione di Chou allo scopo di tener conto dello scattering della radiazione infrarossa da parte delle particelle di nube o aerosol. La parametrizzazione prodotta potrà essere sfruttata allo scopo di creare un set di tabelle consultabili dal codice, che potranno essere usate per sostituire le routine di Mie. Lo studio sugli effetti indotti dalla implementazione della approssimazione di Chou è stata investigata considerando diversi scenari atmosferici. Il modello sfruttato per calcolare le radianze è LBLDIS. Per ogni scenario sono quindi calcolate e confrontate le due soluzioni, implementando o non implementando l’approssimazione di Chou. Una parametrizzazione in funzione del raggio della distribuzione è trovata per: l’efficienza di estinzione, l’albedo si singolo scattering, il parametro di asimmetria, e il parametro di backscattering di Chou. L’impatto e le differenze nelle radianze introdotte dall'utilizzo dell’approssimazione di Chou e della parametrizzazione delle proprietà ottiche, è valutato per diversi scenari atmosferici.

10

Matthews, Alison Mary. "High resolution spectral remote sensing of phytoplankton in the coastal zone". Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241275.

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Mais fontes

Livros sobre o assunto "High Spectral Resolution":

1

Lawrence, Marple S., IEEE Educational Activities Board e IEEE Signal Processing Society, eds. High-resolution and higher-order spectral analysis. Piscataway, N.J: IEEE, 1990.

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2

A, Landgrebe D., e United States. National Aeronautics and Space Administration., eds. Spectral feature design in high dimensional multispectral data. West Lafayette, Ind: School of Electrical Engineering, Purdue University, 1988.

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3

Uehara, Kiyoji, e Hiroyuki Sasada. High Resolution Spectral Atlas of Nitrogen Dioxide 559–597 nm. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82409-8.

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4

Uehara, K. High resolution spectral atlas of nitrogen dioxide 559-597 nm. Berlin: Springer-Verlag, 1985.

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5

Uehara, K. High resolution spectral atlas of nitrogen dioxide 559-597 nm. Berlin: Springer, 1985.

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6

Chedin, Alain, Moustafa T. Chahine e Noëlle A. Scott, eds. High Spectral Resolution Infrared Remote Sensing for Earth’s Weather and Climate Studies. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84599-4.

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7

Alain, Chedin, Chahine Moustafa T, Scott Noëlle A. 1941-, North Atlantic Treaty Organization. Scientific Affairs Division. e NATO Advanced Research Workshop on High Spectral Resolution Infrared Remote Sensing for Earth's Weather and Climate Studies (1992 : Paris, France), eds. High spectral resolution infrared remote sensing for earth's weather and climate studies. Berlin: Springer, 1993.

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8

United States. National Aeronautics and Space Administration., ed. Exploration of the solar-stellar connection at high specral resolution with the ultraviolet spectrometer and polarimeter and studies of thermal bifurcation at the ... Boulder, CO: University of Colorado at Boulder, 1987.

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9

United States. National Aeronautics and Space Administration., ed. Exploration of the solar-stellar connection at high specral resolution with the ultraviolet spectrometer and polarimeter and studies of thermal bifurcation at the ... Boulder, CO: University of Colorado at Boulder, 1987.

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Katō, Hajime. Doppler-free high resolution spectral atlas of iodine molecule 15 000 to 19 000 cm⁻¹. Japan: Japan Society for the Promotion of Science, 2000.

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Capítulos de livros sobre o assunto "High Spectral Resolution":

1

Wang, Yijun, e Jelle de Plaa. "High-Resolution Spectral Analysis". In High-Resolution X-ray Spectroscopy, 125–47. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4409-5_6.

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Yang, Jian. "Suitable Spectral Mixing Space Selection for Linear Spectral Unmixing of Fine-Scale Urban Imagery". In High Spatial Resolution Remote Sensing, 187–200. Boca Raton, FL : Taylor & Francis, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/9780429470196-9.

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Yang, Ruliang, Haiying Li, Shiqiang Li, Ping Zhang, Lulu Tan, Xiangwu Gao e Xueyan Kang. "SAR Super-Resolution Imaging Method Based on Spectral Estimation". In High-Resolution Microwave Imaging, 445–90. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7138-6_15.

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Byrnes, Christopher I., Tryphon T. Georgiou e Anders Lindquist. "Advances in High-Resolution Spectral Estimation". In The Kluwer International Series in Engineering and Computer Science, 167–79. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-5223-9_13.

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Cai, Wei, David Gottlieb e Chi-Wang Shu. "Essentially Nonoscillatory Spectral Fourier Methods for Shock Wave Calculations". In Upwind and High-Resolution Schemes, 375–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60543-7_15.

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Singh, Kunwar K., Lindsey Smart e Gang Chen. "LiDAR and Spectral Data Integration for Coastal Wetland Assessment". In High Spatial Resolution Remote Sensing, 71–88. Boca Raton, FL : Taylor & Francis, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/9780429470196-4.

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Yang, Ruliang, Haiying Li, Shiqiang Li, Ping Zhang, Lulu Tan, Xiangwu Gao e Xueyan Kang. "SAR Super-Resolution Methods Based on Spectral Bandwidth Extrapolation and Adaptive Side Lobe Reduction". In High-Resolution Microwave Imaging, 491–542. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7138-6_16.

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Migenes, V., J. A. Yates, R. J. Cohen, M. C. Shepherd e P. F. Bowers. "High Resolution & High Sensitivity Spectral-Line Imaging with Multiple Arrays". In Very High Angular Resolution Imaging, 334–36. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0880-5_59.

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Sun, Li Qun, Hong Yun Qiu, Zhen Yu Huang, En Yao Zhang e Qian Tian. "Curvature Spectrum Correction in High Spectral Resolution Minitype Spectrometer". In Optics Design and Precision Manufacturing Technologies, 810–15. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-458-8.810.

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Lahr, J. H. G. "High-Resolution Spectral Analysis Using Recurrence Relations". In Recent Advances in Fourier Analysis and Its Applications, 463–82. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0665-5_27.

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Trabalhos de conferências sobre o assunto "High Spectral Resolution":

1

Jianzhao, Li, Chen Lingbing, Zhao Youyuan e Li Fuming. "Persistent spectral hole burning in organic materials". In High Resolution Spectroscopy. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.mb8.

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As a technique for high resolution spectroscopy one-photon and photon—gated persistent spectral hole burning was realized in our organic materials. Hole shape, properties and quantum efficiency of hole formation were investicated. Hole growth dynamics and theory for it were given.

2

Brault, Janes W., e Mark C. Abrams. "DECOMP: A Fourier Transfom Spectra Decomposition Program". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/hrfts.1989.pdp2.

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Current techniques for processing high resolution Fourier transform spectra revolve around interactive graphical display of the spectrum on a computer. The DECOMP spectrum decomposition program is designed explicitly for the reduction of Fourier transform spectra and focuses on reducing a spectrum into a list of line parameters. Basic methods of spectrum manipulation will be demonstrated and a IBM PC - compatible computer will be available for hands-on demonstrations of the process of spectrum analysis. Figures 1 and 2 illustrate the process of background subtraction: in Figure 1 a low resolution spectrum is generated by binning the high resolution spectrum and beneath the spectrum is a background correction function generated by creating a low resolution "minima" spectrum and smoothing the spectrum. The results of the background correction are given in Figure 2. Figure 3 illustrates a common problem in Fourier transform spectroscopy: the finite length of the interferogram introduces "ringing" into the spectrum. Using a filtered fitting routine in DECOMP the ringing can be effectively removed yielding a spectrum illustrated in Figure 4, in which several new spectral features that had been hidden beneath the ringing. An example of the atlas plots that can be generated using DECOMP is given in Figure 5.

3

Simon, A., e R. Rubinovitz. "Recent Developments in High Resolution Spectroscopy Using the IFS 120 HR". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/hrfts.1989.ma1.

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In order to successfully produce high resolution spectra, a spectrometer must possess qualities such as precision optics, a high degree of optical stability, and sensitivity. Additionally, it is highly desirable that the instrument be versatile with respect to permitting a variety of samples to be scanned in the desired spectral regions. Otter practical considerations such as the time required to obtain the spectrum, and general ease of use should be considered in the spectrometer design. In order to meet such demanding criteria, it is clear that Fourier transform (FT) techniques would be appropriate.

4

Goldman, A., F. J. Murcray, R. D. Blatherwick, F. H. Murcray, J. J. Kosters, F. S. Bonomo, S. J. David, D. G. Murcray e C. P. Rinsland. "Recent Results from High Resolution Infrared Atmospheric and Laboratory Fourier Transform Spectra". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/hrfts.1992.fd5.

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High resolution (0.002-0.003 cm-1) Michelson type interferometer systems have been used at the University of Denver since 1987 to obtain infrared solar absorption spectra of the stratosphere during several balloon flights (~37 km), as well as ground-based solar spectra and laboratory spectra of molecules of stratospheric and tropospheric interest. The stratospheric spectra cover the 700-2200 cm-1 region and show many new spectral features of important atmospheric gases such as O3 (including 18O and 17O isotopic species), NO2, HNO3, O2, N2, COF2, ClONO2, SF6 and others. The new spectral features are enhanced by the high resolution and long path spectra obtained during sunrise and sunset. Also, new features appear as the concentrations of some trace gases increases in the atmosphere.

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Davis, Sumner P., Rolf Engleman e Mark C. Abrams. "Fourier Transform Spectroscopy of OH and OD in the Infrared". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/hrfts.1989.wa2.

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We are making a thorough study of the Meinel bands of OH and OD radicals in the spectral region 1900 to 9000 cm−1. Three sources have been used, the ozone-hydrogen flame, the oxygen-acetylene flame, and the inductively coupled plasma (ICP). Differences in the spectra are immediately apparent, as shown in Figure 1. The ozone-hydrogen flame operates at low pressure, the lines are sharp, and the excitation is non-thermal. The oxygen-acetylene flame operates at atmospheric pressure and produces thermal excitation and broad lines. The ICP spectrum is similar to the oxygen-acetylene flame but with lines of intermediate sharpness.

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Grubbs, W. Tandy, e Richard A. MacPhail. "High Resolution Stimulated Brillouin Gain Spectroscopy". In High Resolution Spectroscopy. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.ma3.

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Brillouin spectroscopy has been an important source of information about the collective dynamics of molecules in liquids.1,2 In a conventional Brillouin experiment, a Fabry-Perot interferometer is used to measure the spectrum of laser light scattered at an angle θ by spontaneous density fluctuations in a sample. The Brillouin peaks in the spectrum arise from the acoustic wave component of these density fluctuations, and accordingly the shift of the Brillouin peaks from the elastic Rayleigh scattering peak corresponds to the acoustic frequency, while the width of the Brillouin peaks corresponds to the acoustic damping rate. By varying θ, and thus the scattering wavevector, one can determine the dispersion in the speed of sound and the acoustic attenuation, which in turn characterize the elastic and viscous responses of the fluid. A more detailed analysis of the spectral lineshape with the aid of generalized hydrodynamic theories allows one to determine the values of transport coefficients that describe the molecular dynamics.1

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Abrams, Mark C. "Detector nonlinearity in Fourier transform spectroscopy". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/hrfts.1992.saa6.

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Spectral distortion due to the nonlinear response of HgCdTe detectors is well known. Methods for removing such features are discussed. Nonlinear response in HgCdTe detectors is a well known complication in midir Fourier transform spectroscopy; methods of removing the spectral artifacts created by nonlinearity are less well understood. While the instrument and experiment may be designed so that the desired spectrum is properly sampled, non-linearity introduces spectral features that lie outside the intended bandpass and consequently are undersampled and subject to aliasing. Consequently, in cases where nonlinear response may be expected it is essential that optical filters be chosen with the nonlinear harmonics in mind. Several examples of nonlinearity are considered, with practical examples drawn from the ATMOS data set.

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Le Blanc, S. P., Z. Qi e R. Sauerbrey. "Plasma-induced cross-phase modulation and its application to visible and VUV femtosecond pulse characterization". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/hrfts.1994.mb1.

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Understanding the interaction of an intense ultrashort laser pulse with an optical-field-ionized plasma is of fundamental interest for recently proposed x-ray laser schemes [1] and the guiding of optical pulses in plasma channels [2]. Because field ionization rates depend strongly on the laser intensity which varies in both time and space, both the spatial and temporal properties of field-ionized plasmas must be considered when characterizing such plasmas by ionization induced spectral blueshifting. Spectral blueshifting occurs when an intense laser pulse propagates through a gas and field ionization causes a rapid increase in the electron density along the propagation path. Temporal variation in the electron density causes plasma-induced self-phase modulation, and the spectrum of the laser pulse consists of blueshifted components [3]. In previous work, we have investigated the spectral characteristics of spectral blueshifting using a femtosecond KrF excimer laser pulse focused to peak intensities of 1014 Wcm-2 in high pressure rare gases [4]. Here, we present the results of two-color pump probe experiments to investigate the temporal and spatial characteristics of spectral blueshifting, and demonstrate new techniques for visible and VUV ultrashort pulse characterization based on plasma-induced cross-phase modulation.

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Nolt, I. G., J. Park, M. D. Vanek, D. A. Jennings, F. Mencaraglia, B. Carli, M. Poggesi, E. Rossi, M. Carlotti e J. V. Radostitz. "High Resolution Spectra of Stratospheric Emission in the Spectral Range of 35 to 130 cm-1". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/hrfts.1992.fd2.

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High resolution measurements of the far infrared emission spectrum of the stratosphere were first obtained in 1978 following the Italian development of a balloon-borne Fourier transform spectrometer which used new HeNe laser technology to achieve an FTI mirror stroke of 75 cm. In four flights between 1978 and 1983, this instrument provided the highest resolution measurements for validating spectral database models of the far infrared atmospheric emission1, and for retrieving a number of important stratospheric trace species2. In 1988, an International Cooperative Program was instituted by NASA and the Italian Space Agency for the purpose of upgrading the performance of this instrument for use in the Correlative Measurement Program of the Upper Atmosphere Research Satellite.

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Toth, Robert A. "Laboratory Spectroscopy of H2O and N2O". In High Resolution Fourier Transform Spectroscopy. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/hrfts.1992.tha2.

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High resolution laboratory measurements of line positions, strengths, and pressure broadening parameters of atmospheric trace molecules are important for the analysis of atmospheric measurements. Two of the several key molecules involved in this scenario are N2O and H2O. This text describes the laboratory measurements, analysis and results of an extensive study on N2O and H2O infrared spectra. The spectra were obtained with a Fourier-transform spectrometer located in the McMath solar telescope facility at the Kitt Peak National Observatory. The spectral resolution was 0.005 cm-1 for the region below 2200 cm-1 and from 2200 to 8000 cm-1, the resolution was 0.01 cm-1.

Relatórios de organizações sobre o assunto "High Spectral Resolution":

1

Georgiou, Tryphon T. High Resolution Spectral Analysis. Fort Belvoir, VA: Defense Technical Information Center, outubro de 2006. http://dx.doi.org/10.21236/ada534538.

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Wetmore, Alan, David Ligon e Ramaz Kvavilashvili. Preliminary High Spectral-Resolution PFNDAT. Fort Belvoir, VA: Defense Technical Information Center, maio de 2004. http://dx.doi.org/10.21236/ada479051.

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3

Goldsmith, John. High Spectral Resolution Lidar (HSRL) Instrument Handbook. Office of Scientific and Technical Information (OSTI), abril de 2016. http://dx.doi.org/10.2172/1251392.

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Eloranta, E. W. (Development of high spectral resolution lidar technology). Office of Scientific and Technical Information (OSTI), julho de 1991. http://dx.doi.org/10.2172/5271014.

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Eloranta, E. The high spectral resolution (scanning) lidar (HSRL). Office of Scientific and Technical Information (OSTI), setembro de 1995. http://dx.doi.org/10.2172/232590.

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6

Revercomb, H. E. High spectral resolution measurements for the ARM Program. Office of Scientific and Technical Information (OSTI), maio de 1992. http://dx.doi.org/10.2172/7225686.

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Eloranta, E. W. Development of high spectral resolution lidar (HSRL) technology. Final report. Office of Scientific and Technical Information (OSTI), maio de 1995. http://dx.doi.org/10.2172/64214.

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Eloranta, E. W., e P. K. Piironen. Initial data from a new High Spectral Resolution Lidar. Appendix A. Office of Scientific and Technical Information (OSTI), dezembro de 1993. http://dx.doi.org/10.2172/81056.

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Patel, Sonal, e Sean Simpson. Active Dopant Optical Spectroscopy via Laser Ablation for High Resolution Spectral Measurements. Office of Scientific and Technical Information (OSTI), junho de 2019. http://dx.doi.org/10.2172/1762648.

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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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