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Academic literature on the topic 'Sulfur dioxide Spectra'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Sulfur dioxide Spectra"

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Bai, Xiulin, Qinlin Xiao, Lei Zhou, Yu Tang, and Yong He. "Detection of Sulfite Dioxide Residue on the Surface of Fresh-Cut Potato Slices Using Near-Infrared Hyperspectral Imaging System and Portable Near-Infrared Spectrometer." Molecules 25, no. 7 (April 3, 2020): 1651. http://dx.doi.org/10.3390/molecules25071651.

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Sodium pyrosulfite is a browning inhibitor used for the storage of fresh-cut potato slices. Excessive use of sodium pyrosulfite can lead to sulfur dioxide residue, which is harmful for the human body. The sulfur dioxide residue on the surface of fresh-cut potato slices immersed in different concentrations of sodium pyrosulfite solution was classified by near-infrared hyperspectral imaging (NIR-HSI) system and portable near-infrared (NIR) spectrometer. Principal component analysis was used to analyze the object-wise spectra, and support vector machine (SVM) model was established. The classification accuracy of calibration set and prediction set were 98.75% and 95%, respectively. Savitzky–Golay algorithm was used to recognize the important wavelengths, and SVM model was established based on the recognized important wavelengths. The final classification accuracy was slightly less than that based on the full spectra. In addition, the pixel-wise spectra extracted from NIR-HSI system could realize the visualization of different samples, and intuitively reflect the differences among the samples. The results showed that it was feasible to classify the sulfur dioxide residue on the surface of fresh-cut potato slices immersed in different concentration of sodium pyrosulfite solution by NIR spectra. It provided an alternative method for the detection of sulfur dioxide residue on the surface of fresh-cut potato slices.
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Anderson, A. "Infrared and Raman spectra of crystalline sulfur dioxide." Journal of Chemical Physics 67, no. 9 (1999): 4300. http://dx.doi.org/10.1063/1.435371.

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Rongtong, Bumrungrat, Thongchai Suwonsichon, Pitiporn Ritthiruangdej, and Sumaporn Kasemsumran. "Determination of sulfur dioxide content in osmotically dehydrated papaya and its classification by near infrared spectroscopy." Journal of Near Infrared Spectroscopy 26, no. 6 (October 25, 2018): 359–68. http://dx.doi.org/10.1177/0967033518808054.

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Sulfur dioxide (SO2) is used as a preservative in osmotically dehydrated papaya to improve product quality and extend shelf-life. The potential of near infrared spectroscopy, as a rapid method, was investigated to determine sulfur dioxide in osmotically dehydrated papaya. Commercial and laboratory osmotically dehydrated papaya samples were selected to determine the sulfur dioxide content using the Monier–Williams method. From the total of 350 samples, subsets were selected randomly for the calibration set (n=250) and validation set (n = 100). Near infrared spectra in the region 800–2400 nm were measured on the samples of osmotically dehydrated papaya. Quantitative analyses of sulfur dioxide in the osmotically dehydrated papaya and their qualitative analyses were carried out using multivariate analysis. Before developing models, a second derivative spectral pretreatment was applied to the original spectral data. Subsequently, two wavelength interval selection methods, namely moving window partial least squares regression (MWPLSR) and searching combination moving window partial least squares (SCMWPLS), were applied to determine the suitable input wavelength variables. For quantitative analysis, three linear models (partial least squares regression, MWPLSR and SCMWPLS) and a non-linear artificial neural network model were applied to develop predictive models. The results showed that the artificial neural network model produced the best performance, with correlation coefficient (R) and root mean square error of prediction values of 0.937 and 114.53 mg SO2 kg−1, respectively. Qualitative models were developed using partial least squares-discriminant analysis and soft independent modeling of class analogy (SIMCA) for the optimized combination of informative regions of the near infrared spectra to classify osmotically dehydrated papaya into three groups based on sulfur dioxide. The SIMCA in combination with SCMWPLS model had the highest correct classification rate (96%). The study demonstrated that near infrared spectroscopy combined with SCMWPLS is a powerful procedure for both quantitative and qualitative analyses of osmotically dehydrated papaya. Therefore, it was demonstrated that near infrared spectroscopy could be effective tools for food quality and safety evaluation in food industry.
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Smirnova, O. V., A. G. Grebenyuk, and V. V. Lobanov. "A quantum chemical study on the effect of titanium dioxide modification with non-metals on its spectral characteristics." Himia, Fizika ta Tehnologia Poverhni 11, no. 4 (December 30, 2020): 539–46. http://dx.doi.org/10.15407/hftp11.04.539.

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The experimental results obtained in the study on the possibility of sensitizing titanium dioxide (polymorphic anatase phase) to the visible region of the spectrum by doping and co-doping with impurities of non-metals in order to create effective photocatalysts for the decomposition of organic compounds have been analyzed. The presence of impurity atoms appears to result in a change in the electronic structure of the titanium dioxide matrix, in the appearance of “impurity bands” and in the narrowing of the energy gap of titanium dioxide. Such a modification is accompanied by an extension of the spectral range of sensitivity of photoactive solids to the long-wavelength region of the spectrum and, therefore, can be used to improve the catalytic properties of these materials. Spectral manifestations of carbon impurities in titanium dioxide in the form of carbide and carbonate, as well as sulfur in the forms of sulfite, sulfide, and sulfate, have been studied by the density functional theory method. A Ti14H22O39 cluster model was chosen for the titanium dioxide matrix. The calculations were carried out in the framework of the cluster approximation, using functional B3LYP and basis set 6-31G (d, p). Comparison of the results of quantum chemical calculations with the available experimental data shows that the impurity sulfur and carbon atoms in titanium dioxide, which are in different coordination states and different oxidation states, appear in different spectral ranges. This circumstance makes it possible to elucidate the structure of the samples based on the experimental spectra. A change in the coordination and oxidation states of impurity atoms leads to spectral shifts and splitting of peaks, which can reach 1.5 eV (XPS). The presence of admixtures of non-metals leads to a change in color (deepening in the case of sulfide or carbide) of the samples, appearing in the corresponding UV spectra.
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Coates, J., and K. L. DeVries. "Effects of stress and sulfur dioxide on Spectra ®." Polymer 41, no. 12 (June 2000): 4661–69. http://dx.doi.org/10.1016/s0032-3861(99)00673-4.

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Carlson, R. W., W. D. Smythe, D. L. Matson, R. Lopes-Gautier, J. Hui, M. Segura, A. C. Ocampo, et al. "Surface Composition of the Galilean Satellites from Galileo Near-Infrared Mapping Spectroscopy." Highlights of Astronomy 11, no. 2 (1998): 1078–81. http://dx.doi.org/10.1017/s1539299600019638.

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AbstractThe Galileo Near Infrared Mapping Spectrometer (NIMS) is currently obtaining spectral maps of Jupiter’s moons to determine the composition and spatial distribution of minerals on the satellite surfaces. Sulfur dioxide, as a frost or ice, covers much of Io’s surface, except in hot volcanic areas. A weak spectral feature at 3.15 μm suggests the presence of an OH containing surface compound (hydroxide, hydrate, or water) and a broad absorption above 1 μm is reasonably attributed to iron-containing minerals, such as feldspars and pyrite. Water is the dominant molecule covering Europa’s surface, occurring as ice but also as a hydrate. The trailing side shows high concentrations of these hydrous minerals, whose identifications are not yet established. Ganymede’s surface exhibits water absorption bands, largely due to ice but hydrates are also present. A dark component is present, but with a smaller proportion compared to Callisto. Some of the non-ice features seen on Ganymede are similar to those found in Callisto’s spectra (see below). Among the icy Galilean satellites, Callisto shows the least amount of water ice, covering about 10% of the surface in patchy concentrations. Most of the surface is covered with unidentified (as yet) dark minerals. The exposed ice is often associated with impact craters, implying that the darker material exists as a blanket over more pure ice. Non-ice spectral features at 3.88, 4.03, 4.25, and 4.57 μm are present in Callisto’s spectra (and some of these appear in Ganymede’s spectra), each with different spatial distributions. Laboratory spectra suggest that the 4.25-μm feature is due to carbon dioxide which is trapped in the surface grains. The band at 4.03 μm may be due to sulfur dioxide, which probably originated from Io. Molecules containing CN, SH, SiH, and perhaps deuterated constituents are candidates for the other features, some of which could be derived from shock-heated and modified material from impacts, perhaps of carbonaceous composition. There is evidence for the presence of hydrated minerals on Callisto, based on water band shifts and shapes.
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Lovas, F. J. "Microwave Spectra of Molecules of Astrophysical Interest. XXII. Sulfur Dioxide (SO2)." Journal of Physical and Chemical Reference Data 14, no. 2 (April 1985): 395–488. http://dx.doi.org/10.1063/1.555729.

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Hayashi, Soichi, Motohisa Oobatake, Tatsuo Ooi, and Katsunosuke Machida. "Molecular Dynamics Using Internal Coordinates. I. Infrared Spectra of Sulfur Dioxide." Bulletin of the Chemical Society of Japan 58, no. 4 (April 1985): 1105–8. http://dx.doi.org/10.1246/bcsj.58.1105.

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Othman, Fatin Fatini, Banjuraizah Johar, Shing Fhan Khor, Suffi Irni Alias, Nik Akmar Rejab, and Syed Nuzul Fadzli Adam. "Characterisation Of FGD Sludge From One of Glass Industrial in Malaysia and Their Potential as Ceramic Mould." Journal of Physics: Conference Series 2129, no. 1 (December 1, 2021): 012093. http://dx.doi.org/10.1088/1742-6596/2129/1/012093.

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Abstract Flue Gas Desulfurization (FGD) is a waste incineration process used to eliminate sulfur dioxide (SO2) from flue gas power plants. Limestone/gypsum was injected into the plant to trap sulfur dioxide and change their chemical composition from calcium carbonate to calcium sulfate dehydrate, known as FGD sludge wet scrubber. Nowadays, it is necessary to overcome the environmental pollution caused by the massive production of FGD sludge waste through recycling. In this research, FGD sludge was characterised to reveal its chemical composition, crystalline phase, and FTIR spectra characteristics. FGD sludge recorded a moderate alkaline with a pH of 8.24. Based on the XRD result, FGD sludge was mainly composed of gypsum (CaSO4•2H2O) and anhydrite (CaSO4). XRF analysis also shows that FGD sludge was mainly composed of calcium oxide, sulfur trioxide, silica, and potassium oxide.
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Ye, Yanpeng, Enlai Wan, Zhongmou Sun, Xinyang Zhang, Zhirong Zhang, and Yuzhu Liu. "Online detection and source tracing of crop straw burning." Journal of Laser Applications 34, no. 4 (November 2022): 042049. http://dx.doi.org/10.2351/7.0000866.

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The carbon dioxide, sulfur dioxide, and metal ions produced by straw burning can severely pollute the atmosphere; thus, online detection and traceability for straw burning is very important. However, to our best knowledge, there is no comprehensive system that can satisfy online detection, classification, and traceability due to the challenging online detection and traceability of straw burning. In this paper, a new system based on laser-induced breakdown spectroscopy (LIBS) and machine learning is developed, and this developed system is employed for the first time in online detection and traceability of straw combustion. Four different types of straw are selected and the straw burning smoke is monitored online using this developed system. The analysis of straw smoke spectra shows that there are Fe, Mn, and Ba heavy metal spectra in the smoke spectra. By comparing the smoke spectra of different types of straw, the characteristic spectral lines with large differences are selected and dimensionality reduction is performed by linear discriminant analysis algorithm. Then, combined with random forest to achieve classification, the final smoke recognition accuracy reaches 87.0%. Straw ash is then used as a reference analysis and the same operation is performed on it. Mn, Ba, and Li heavy metal spectral lines are found in the spectra of ash, and the final recognition accuracy is 92.6%. The innovative and developed system based on LIBS and machine learning is fast, online, and in situ and has far-reaching application prospects in the environment.
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Dissertations / Theses on the topic "Sulfur dioxide Spectra"

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Zamotaeva, Valeriya. "High-resolution FTIR spectra analysis of sulfur dioxide isotopologues." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK053.

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Dans cette thèse, nous avons examiné les propriétés spectrales de l’anhydride sulfureux. Les spectres FTIR expérimentaux de nombreux isotopologues du dioxyde de soufre, 32S16O2, 34S16O2, 32S18O2 et 32S16O18O, ont été enregistrés pour la première fois dans les régions des bandes fondamentales, «chaudes», harmoniques et de combinaison. La grande variabilité des conditions expérimentales a permis d’observer et d’identifier pour la première fois des transitions appartenant aux ban¬des ro-vibrationnelles suivantes : 3v2, 3v2 - v2, 2v2 - v2 bandes de 32S16O2 ; 2v2 - v2 bande de 34S16O2 ; v1 + v2, v2 + v3, v1 + v3, 2v1, 2v3 bandes de 32S18O2 ; v1, v3, 2v1, v1 + v3, 2v3 bandes de 32S16O18O. Les problèmes spectroscopiques inverses ont été résolus pour les états étudiés avec une déviation «rms» comparable à l’incertitude expérimentale. Suite à cette analyse, environ 38 000 transitions ro-vibrationnelles appartenant à 17 états vibratoires excités ont été identifiées pour la première fois. Les données très précises obtenues sur tous les isotopologues du dioxyde de soufre ont été utilisées pour corriger les paramètres de la IPF
In this thesis we considered the spectral properties of the sulfur dioxide. The experimental FTIR spectra of numerous sulfur dioxide isotopologues, 32S16O2, 34S16O2, 32S18O2 and 32S16O18O, were first recorded in the regions of fundamental, «hot», combination and overtone bands. The wide variability of the experimental conditions gave possibility to observe and identify for the first time transitions be¬ longing to the following of ro-vibrational bands: 3v2, 3v2 - v2, 2v2 - v2 bands of 32S16O2; 2v2 - v2 band of 34S16O2; v1 + v2, v2 + v3, v1 + v3, 2v1, 2v3 bands of 32S18O2; v1, v3, 2v1, v1 + v3, 2v3 bands of 32S16O18O. The inverse spectroscopic problems were solved for the studied states with the «rms»-deviation comparable to the experimental uncertainty of the spectral line position. As a result of the analysis about 38 000 ro-vibrational transitions belonging to 17 excited vibrational states were identified for the first time. The obtained highly accurate data on all sulfur dioxide isotopologues were used to correct the parameters of the IPF
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Bellotti, Amadeo. "The millimeter-wavelength sulfur dioxide absorption spectra measured under simulated Venus conditions." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53444.

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The objective of this research is to develop a mathematical model that accurately estimates the opacity of sulfur dioxide in a carbon dioxide atmosphere under conditions characteristic of the Venus troposphere based on extensive laboratory measurements. High precision measurements of the millimeter-wavelength properties of sulfur dioxide are being conducted under multiple pressure and temperatures. These measurements are being conducted in both W-band and F-band (2-3 and 3-4 millimeter-wavelengths). The results of this research will significantly improve the understanding of the millimeter-wavelength emission spectrum of Venus and possibly determine the source of variations in the Venus millimeter-wavelength emissions.
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Mares, Aimee Gail. "Remotely sensed density measurements of volcanic sulfur dioxide plumes using a spectral long wave infrared imager." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Sep%5FMares.pdf.

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Thesis (M.S. in Space Systems Operations)--Naval Postgraduate School, September 2002.
Thesis advisor(s): Richard C. Olsen, Paul G. Lucey. Includes bibliographical references (p. 123-125). Also available online.
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Zellmer, Robert J. "Ab initio investigations of the sulfur dioxide electronic spectrum in the 3900-1700 Å region /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487841548269149.

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Khoo, Sing Soong. "Remote sensing of sulfur dioxide (SO2) using the Lineate Imaging Near-Ultraviolet Spectrometer (LINUS)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FKhoo.pdf.

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Thesis (M.S. in Systems Engineering (EW))--Naval Postgraduate School, March 2005.
Thesis Advisor(s): Richard M. Harkins, Richard C. Olsen. Includes bibliographical references (p. 53). Also available online.
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Gromova, Olga. "High resolution molecular spectroscopy of the sulfur-containing XY2 type molecules." Dijon, 2010. http://www.theses.fr/2010DIJOS090.

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Dans cette thèse, nous avons effectué des spectres d'absorption à haute résolution de H2S, D2S, HDS et SO2 enregistrés pour la première fois ou avec une meilleure précision expérimentale que les spectres antérieurs. Nous avons développé une méthode originale de "global fitting" qui nous a permis l'analyse de 22 bandes vibrationnelles soit un total de 9700 transitions rovibrationnelles pour la molécule de D2S. Nous avons appliqué cette méthode à des molécules de symétrie CS, en particulier tout le spectre rovibrationnel de la molécule HDS a été analysé. La méthode SPGF est appliquée aux molécules triatomiques H2S, D2S, HDS. Une procédure originale permettant l'identification des bandes très peu intenses a été mise au point pour la première fois et appliquée aux bandes chaudes de la molécule SO2. Le formalisme U(p+1) est adapté aux molécules triatomiques non linéaires de symétrie C2v et les paramètres d'un Hamiltonien vibrationnel sont déterminés dans le cas de la molécule D2S
In this thesis, we analyzed the high resolution absorption molecular spectra of H2S, D2S, HDS and SO2 registered for the first time or with better experimental characteristics as compared with those registered before. For the first time in the practice of rotation-vibrational spectroscopy in the frame of the developed method of "global fitting" the analysis of 22 bands (as a whole more than 9700 rotation-vibrational lines) of D2S molecule is realized. This method of "global fitting" is developed with regard to molecules of Cs symmetry ; on this basis a simultaneous analysis of all the known up to the present rotation-vibrational spectra of HDS molecule is realized. The SPGF method is applied to the three-atom molecules H2S, D2S, HDS. An original procedure of the identification of very weak lines is developed for the first time and practically realized for the example of "hot" lines of SO2 molecule. U(p+1) formalism is adapted to the three-atom non-linear molecules of C2v symmetry and the parameters of a vibrational Hamiltonian is developed in the case of the D2S molecule
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NGOM, ELHADJI ABIB. "Contribution a l'etude des spectres infrarouges de quelques rotateurs asymetriques d : :(2)s, d::(2)o, no::(2)." Paris 6, 1987. http://www.theses.fr/1987PA066552.

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Analyse des spectres ir a haute resolution pour plusieurs niveaux d'energie des etats vibrationnels. Les niveaux deduits de l'experience ont ete reproduits a l'aide d'un hamiltonien. Les intensite de nombreuses raies mesures ont permis de determiner la derivee premiere du moment dipolaire et un spectre synthetique complet des bandes a ete calcule
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KUAN-CHENG, LIN, and 林冠臣. "A theoretical study of the phosphorescence spectra of sulfur dioxide." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/20697259941039936630.

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碩士
國立臺中教育大學
科學教育與應用學系碩士班
103
The equilibrium geometries and vibrational frequencies of the singlet ground state (S0) and three triplet excited states (T1, T2 and T3) of sulfur dioxide were computed by using the density-functional theory (B3LYP and M06-2X functionals) and the coupled-cluster theory (CCSD(T)) associated with the aug-cc-pVTZ basis set. Franck-Condon factors were computed by using the approach developed by our group, from which the phosphorescence spectra of SO2 were simulated. The adiabatic excitation energies were obtained by extrapolating the CCSD(T) energies to the complete basis set (CBS) limit. The simulated phosphorescence spectra of T1  S0 are in agreement with the experiment. The calculated excitation energies are in excellent agreement with the experimental values, both of which are 3.194 eV. Although there are no experimental phosphorescence spectra of T2 and T3 for comparison, we simulate the spectra and predict that they will show broad and complicated features, with the adiabatic excitation energies 3.259 and 3.457 eV, respectively.
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Huang, Cheng-Liang, and 黃正良. "High-resolution spectra and dynamical study of jet-cooled sulfur dioxide and acetaldehyde." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/17086923634106183617.

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Lin, Yu-De, and 林雨德. "Theoretical Study on Phosphorescence Spectrum of Sulfur Dioxide and its Neon complex." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/x64r44.

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碩士
國立交通大學
應用化學系碩博士班
103
Phosphorescence, an important property of molecule, is the electronic transition from triplet to singlet state. It is difficult to get single molecule phosphorescence spectrum of sulfur dioxide because of its strong dipole moment which forms dimer easily. To overcome this difficulty, scientists developed matrix method to isolate sulfur dioxide molecule through lattice of matrix. But the effects of matrix molecules have not been theoretically studied yet. In this present study, we investigated theoretical phosphorescence spectra of sulfur dioxide with several methods and basis sets in order that we could find appropriate models which have balance between accuracy and computational time. Then we used these models to simulate spectrum of different geometries of Ne·SO 2 complex and discussed the effects of different position of neon atom.
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Books on the topic "Sulfur dioxide Spectra"

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Smyth, William H. Studies for the loss of atomic and molecular species for Io: Final report for the period of May 7, 1993 to May 6, 1996. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Crystalline sulfur dioxide: Crystal field splittings, absolute band intensities, and complex refractive indices derived from infrared spectra. College Park, Md: Dept. of Chemistry and Biochemistry, University of Maryland, 1986.

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L, Domingue Deborah, and United States. National Aeronautics and Space Administration., eds. IUE's view of Callisto: Detection of an SO₂ absorption correlated to possible torus neutral wind alterations. [Washington, DC]: American Geophysical Union, 1997.

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Remotely Sensed Density Measurements of Volcanic Sulfur Dioxide Plumes Using a Spectral Long Wave Infrared Imager. Storming Media, 2002.

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Conference papers on the topic "Sulfur dioxide Spectra"

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Mares, Aimee G., Richard C. Olsen, and Paul G. Lucey. "LWIR spectral measurements of volcanic sulfur dioxide plumes." In Defense and Security, edited by Sylvia S. Shen and Paul E. Lewis. SPIE, 2004. http://dx.doi.org/10.1117/12.540949.

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Voronina, S. S., A. Yu Akhlestin, A. V. Kozodoev, N. A. Lavrentiev, A. I. Privezentsev, A. Z. Fazliev, and O. V. Naumenko. "Systematization of published spectral data on sulfur dioxide molecule and its isotopologues." In 20th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, edited by Oleg A. Romanovskii. SPIE, 2014. http://dx.doi.org/10.1117/12.2075575.

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Aldina, G. J., and Jeffrey L. Hahn. "Validation Study of FTIR-Based Emissions Measurements at a Municipal Waste Combustor." In 13th Annual North American Waste-to-Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nawtec13-3158.

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EPA Test Methods 301 and 320 include statistical techniques for validating sampling methods in specific gas matrices. Several of these techniques were used to analyze extractive FTIR data collected at a municipal solid waste incinerator and to validate the method for hydrogen chloride (HCl) measurements. FTIR results for carbon monoxide (CO), sulfur dioxide (SO2), and nitric oxide (NO) were also compared to measurements recorded by the facility’s continuous emissions monitors (CEMs). Presented are discussions of the equipment, spectral analyses, and statistical comparisons of the various test methods.
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