Naval Postgraduate School

About: Naval Postgraduate School is a education organization based out in Monterey, California, United States. It is known for research contribution in the topics: Tropical cyclone & Boundary layer. The organization has 5246 authors who have published 11614 publications receiving 298300 citations. The organization is also known as: NPS & U.S. Naval Postgraduate School.

Optically heterodyned coherent Raman spectroscopy

Abstract: A convenient variation of Raman-induced Kerr effect spectroscopy (RIKES) which overcomes many of the previous limitations of coherent Raman spectroscopy is introduced Quantum limited signal-to-noise ratios may be approached by the use of optical heterodyne detection (OHD) Detector current, linearly proportional and phase sensitive to the third-order nonlinear susceptibility, and linearly proportional to the Raman scattering cross section, is produced Heterodyne detection in coherent Raman spectroscopy enables the detection of weak Raman signals that would otherwise be obscured by noise resulting from background sources

Computation of Gauss-Kronrod of quadrature rules

Abstract: Recently Laurie presented a new algorithm for the computation of (2n+1)-point Gauss-Kronrod quadrature rules with real nodes and positive weights. This algorithm first determines a symmetric tridiagonal matrix of order 2n + 1 from certain mixed moments, and then computes a partial spectral factorization. We describe a new algorithm that does not require the entries of the tridiagonal matrix to be determined, and thereby avoids computations that can be sensitive to perturbations. Our algorithm uses the consolidation phase of a divide-and-conquer algorithm for the symmetric tridiagonal eigenproblem. We also discuss how the algorithm can be applied to compute Kronrod extensions of Gauss-Radau and Gauss-Lobatto quadrature rules. Throughout the paper we emphasize how the structure of the algorithm makes efficient implementation on parallel computers possible. Numerical examples illustrate the performance of the algorithm.

Toward aerosol/cloud condensation nuclei (CCN) closure during CRYSTAL‐FACE

Abstract: During July 2002, measurements of cloud condensation nuclei were made in the vicinity of southwest Florida as part of the Cirrus Regional Study of Tropical Anvils and Cirrus Layers-Florida Area Cirrus Experiment (CRYSTAL-FACE) field campaign These observations, at supersaturations of 02 and 085%, are presented here The performance of each of the two CCN counters was validated through laboratory calibration and an in situ intercomparison The measurements indicate that the aerosol sampled during the campaign was predominantly marine in character: the median concentrations were 233 cm-3 (at S = 02%) and 371 cm(sup -3) (at S = 085%) Three flights during the experiment differed from this general trend; the aerosol sampled during the two flights on 18 July was more continental in character, and the observations on 28 July indicate high spatial variability and periods of very high aerosol concentrations This study also includes a simplified aerosol/CCN closure analysis Aerosol size distributions were measured simultaneously with the CCN observations, and these data are used to predict a CCN concentration using Kohler theory For the purpose of this analysis, an idealized composition of pure ammonium sulfate was assumed The analysis indicates that in this case, there was good general agreement between the predicted and observed CCN concentrations: at S = 02%, N(sub predicted)/N(sub observed)= 1047 (R(sup 2)= 0911)); at S = 085%, N(sub predicted)/N(sub observed)=1201 (R(sup 2)= 0835)) The impacts of the compositional assumption and of including in-cloud data in the analysis are addressed The effect of removing the data from the 28 July flight is also examined; doing so improves the result of the closure analysis at S = 085% When omitting that atypical flight, N(sub predicted)/N(sub observed) = 1085 (R(sup 2) = 0770) at S = 085%