Results 31 to 40 of about 1,274,676 (322)

Spectral Power Enhancement in a 100 GHz Photonic Millimeter-Wave Generator Enabled by Spectral Line-by-Line Pulse Shaping

IEEE Photonics Journal, 2010
We report generation of high-modulation-depth photonic millimeter-wave (MMW) waveforms by applying line-by-line pulse shaping on a phase-modulated continuous-wave frequency comb.
F.-M. Kuo, J.-W. Shi, H.-C. Chiang, H.-P. Chuang, H.-K. Chiou, C.-L. Pan, N.-W. Chen, H.-J. Tsai, C.-B. Huang   +8 more
doaj   +1 more source

The Spectral Line Shape of Exotic Nuclei [PDF]

, 1996
The quadrupole strength function of $^{28}O$ is calculated making use of the SIII interaction, within the framework of continuum-RPA and taking into account collisions among the nucleons (doorway coupling).
E. Vigezzi, F. Ghielmetti, G. Colò, G. Colò, G.F. Bertsch, G.F. Bertsch, G.F. Bertsch, H. Sagawa, I. Hamamoto, K.F. Liu, M. Yokoyama, P. F. Bortignon, R. A. Broglia   +12 more
core   +2 more sources

Evidence of the Amino Acids Tyrosine and Phenylalanine in the Interstellar Material of IC348 in Perseus

Life
We employed data from the Spitzer Space Telescope to investigate the presence of the aromatic amino acids tyrosine and phenylalanine in the interstellar gas of the young star cluster IC 348.
Susana Iglesias-Groth, Martina Marín Dobrincic, Antonio Pérez Garrido, Carlos Gutierrez   +3 more
doaj   +1 more source

On line spectral frequencies [PDF]

IEEE Signal Processing Letters, 2003
The commonly used line spectral frequencies form the roots of symmetric and antisymmetric polynomials constructed from a linear predictor. We provide a new, simpler proof that the symmetric and antisymmetric polynomials can be regarded as optimal constrained predictors that correspond to predicting from the low-pass and high-pass filtered signal ...
Tom Bäckström, W.B. Kleijn, Paavo Alku
openaire   +2 more sources

A Spectral Line Survey of Selected 3 mm Bands Toward Sagittarius B2(N-LMH) Using the NRAO 12 Meter Radio Telescope and the BIMA Array I. The Observational Data

, 2003
We have initiated a spectral line survey, at a wavelength of 3 millimeters, toward the hot molecular core Sagittarius B2(N-LMH). This is the first spectral line survey of the Sgr B2(N) region utilizing data from both an interferometer (BIMA Array) and a ...
A. Remijan, B. E. Turner, Bester M., Bogey M., Boucher D., D. N. Friedel, Gerry M. C. L., Johnson D. R., L. E. Snyder, Lafferty W. J., Lovas F. J., Lovas F. J., Lovas F. J., Lovas F. J., Lovas F. J., Schilke P., Tiemann E. J., Willemot E., Winnewisser G., Wyrowski F., Xu L.-H.   +20 more
core   +1 more source

The Spectral Correlation Function -- A New Tool for Analyzing Spectral-Line Maps [PDF]

, 1999
The "spectral correlation function" analysis we introduce in this paper is a new tool for analyzing spectral-line data cubes. Our initial tests, carried out on a suite of observed and simulated data cubes, indicate that the spectral correlation function [
Goodman, Alyssa A., Rosolowsky, Erik W., Williams, Jonathan P., Wilner, David J.   +3 more
core   +4 more sources

Infrared Spectroscopy of RNA Nucleosides in a Wide Range of Temperatures

Life
The RNA world hypothesis suggests that early cellular ancestors relied solely on RNA molecules for both genetic information storage and cellular functions.
Susana Iglesias-Groth, Franco Cataldo, Martina Marin-Dobrincic   +2 more
doaj   +1 more source

A Process for On-Line Spectral Analysis

Measurement + Control, 1969
As a modest contribution to the development of more problem-oriented control solutions, a simple on-line spectral-analysis process is presented and some of its possible applications discussed.
E. Moseley MSc, CEng, MIEE
doaj   +1 more source

Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies

, 2003
Direct time-resolved spectral fitting has been performed on continuous RXTE monitoring of seven Seyfert 1 galaxies in order to study their broadband spectral variability and Fe K alpha variability characteristics on time scales of days to years ...
A. Markowitz, Fabian A. C., George I. M., Guilbert P., Iwasawa K., Magdziarz P., Matt G., Nandra K., R. Edelson, Reynolds C. S., S. Vaughan, Swank J.   +11 more
core   +1 more source

Modeling the near-infrared lines of O-type stars [PDF]

, 2004
We use a grid of 30 line-blanketed unified stellar photosphere and wind models for O-type stars; computed with the code CMFGEN in order to evaluate its potential in the near-infrared spectral domain. The grid includes dwarfs, giants and supergiants.
de Koter, A., Lenorzer, A., Mokiem, M. R., Puls, J.   +3 more
core   +2 more sources