177,315 research outputs found
Data for: HITRAN2016 line file with line shape parameters for the H2O-H2 collision system
No full textHITRAN2016 line file with hydrogen as the broadening gas. The line file uses the new temperature dependence of the half-width and line shift by Gamache and Vispoel. Please see the read_me.txt file for details
George Gamache.
No full textR-P of G. Gamache. 10 May. SR 1054, 55-2, v6, 1p. [3625] Battle of Acton in 1862; against the Indians
PARTITION SUMS FOR NON-LOCAL THERMODYNAMIC EQUILIBRIUM APPLICATIONS: NLTE-PS
No full textD. P. Edwards, M. L\'opes-Puertas, and R. R. Gamache J. Quant. Spectosc. Radiat. Transfer 59, 423-436, 1998.Author Institution: University of Massachusetts Lowell; Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts LowellFor high-altitude radiative transfer models, the importance of non-LTE corrections to the vibrational partition sum has been shown to be important with the differences in calculated radiance as large as 30% at 130 km in some In order to apply this correction the rotational and vibrational partition sums must be determined separately. To facilitate this, rotational and vibrational partition sums are calculated in the temperature range 100 - 450K for a number of isotopomers of atmospheric molecules important in NLTE processes: , , , , , , , , and . The resulting data are fit to a polynomial expression of the form where the coefficients are determined by a simplex nonlinear minimization routine. The resulting coefficients can then be used in a FORTRAN program for rapid recall of the rotational partition sum. The method of calculation of for each isotopomer, convergence of the partition sum in each temperature range, the quality of the fit of the data, and comparisons with other work are discussed. The program NLTE-PS is available from the HITRAN website (http://www.hitran.com/) or from one of the authors (Robert[email protected])
TEMPERATURE DEPENDENCE OF -BROADENED HALFWIDTHS OF
No full text. D. Korff and R. P. Leavitt, Phys, Lett. A 53, 351(1975): D. Robert and J. Bonamy. J. Phys. (Paris) 40, 923(1979); R. P. Leavitt and D. Korpf, J. Chem. Phys. 74, 2180(1981). . P. W. Anderson, Phys. Rev. 76, 647-661(1949); 80, 511-513(1950); C. J. Tsao and B. Curnutte, J. Quant Spectresc. Radiat. Transfer 2, 41-91(1962). . R. R. Gamache and R. W. Davies, J. Mol. Spectrosc. 109, 283-299(1985). This work has been supported by the Aif Force Office of Scientific Research through AFGL task 2310G1. Address of Gamache: University of Lowell Center for Atmospheric Research. 450 Aiken Street, Lowell, MA 01854. Address of Rothman: Optics Division. Air Force Geophysics Laboratory, Hanscom AFB, MA 01731.Author Institution:The temperature dependence of -broadened halfwidths of water was studied for rotational vibrational transitions of atmospheric importance. The halfwidths were calculated using cutoff free with Anderson-Tsao- interruption functions and trajectories correct to first-order-in-. The calculations were carried out for pure rotational transitions and for transitions. The temperture dependence was calculated assuming the exponential form The exponent n has been calculated for different rovibrtional transitions and the calculations have been performed over the temperature range 200 K to 1000 K to be applicable to both atmospheric studies as well as hot sources. The trends in , such as vibrational dependence, J dependence, etc., are examined and recommended values are given
Data for: HITRAN2016 line file with line shape parameters for the H2O-H2 collision system
No full textHITRAN2016 line file with hydrogen as the broadening gas. The line file uses the new temperature dependence of the half-width and line shift by Gamache and Vispoel. Please see the read_me.txt file for details.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Air component foreign broadening contributions to carbon dioxide collisional line shapes in the (30012) ← (00001) band
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Previous issue date: 26Line-by-line spectroscopic databases of CO such as those in HITRAN include so many transitions and bands that it is intractable to provide reference data for every transition and relevant collisional partner. To address this dilemma, theoretical line parameters enabling widespread coverage need to be validated in terms of accurate spectroscopic measurements having well-established uncertainties. In this work, we present frequency-agile, rapid scanning cavity ring-down spectroscopy (FARS) measurements of CO (30012) (00001) band transitions up to J'' = 50. These data correspond to foreign broadening by four gas mixtures: air, N, and two Ar-enriched synthetic air samples, with each sample containing CO at a mole fraction near atmospheric levels. The measured O, N, and Ar foreign broadening parameters were determined using a NIST-developed multi-spectrum fitting algorithm which used appropriate constraints for pressure, temperature, and sample composition. These experimental results are compared to theoretical semiclassical half-widths as well as to literature values.
1. R. R. Gamache, J. Lamouroux, A. L. Laraia, J.-M. Hartmann and C. Boulet, Journal of Quantitative Spectroscopy and Radiative Transfer 113 (11), 976-990 (2012)
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
DECOMPOSITION OF LINE-BROADENING CALCULATIONS INTO STATE-TO-STATE TERMS*
No full text*Work supported by NASA Grant NAGW-1667.Author Institution: Department of Chemistry, MIT; University of Massachusetts Lowell, Center for Atmospheric ReasarchComputer programs designed to calculate pressure broadening by the QFT-ID formulation of Gamache and Davies were modified to calculate individual state-to-state and elastic contributions to the total halfwidth. The calculations were applied to the case of ozone broadened by nitrogen. It is shown that the elastic contribution to the calculated halfwidth is negligible. State-to-state inelastic terms are analyzed for J, and energy gap dependence in to order to describe rotational relaxation propensity rules- Results are compared with inelastic rates determined from time-resolved four-level IR-IR double resonance experiments
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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