91,678 research outputs found
Kepler Fourier concepts: The performance of the Kepler data pipeline
Given the extreme precision attainable with the Kepler Space Telescope, the
mitigation of instrumental artefacts is very important. In an earlier paper
(Murphy 2012), the characteristics of Kepler data were discussed in light of
their effect on asteroseismology. We continue this discussion now that data
processed with the new PDC-MAP pipeline are publicly available; users should
use the latest data reductions available at the Mikulski Archive for Space
Telescopes (MAST), not just for PDC, but also for improvements in the attached
meta-data. We discuss the injection of noise in the frequency range 0-24 c/d
(up to ~277 {\mu}Hz) by the PDC-LS pipeline into ~15 per cent of light-curves.Comment: 4 pages, 7 figures of which 4 are colour. On material presented at
the conference "The Modern Era of Helio- and Asteroseismology" held at
Obergurgl, Austria, May 2012. Published in AN (Volume 333, Issue 10, Pages
1057-1060
Communication and dementia: how talking mats can help people with dementia to express themselves
Creative activities and skills for bright and gifted children to supplement the Scott, Foresman and Company new basic readers for grade two
Thesis (Ed.M.)--Boston Universit
Investigation of Spatial and Temporal Aspects of Airborne Gamma Spectrometry: Preliminary Report on Phase II Survey of the Sellafield Vicinity, the Former RAF Carlisle site, the Albright & Wilson Plant, Workington Harbour and the Cumbrian Coastline, Conducted March 2000
STS-3/OSS-1 Plasma Diagnostics Package (PDP) measurements of Orbiter transmitter and subsystem electromagnetic interference
The plasma diagnostics package receiver system is described to identify the various antennas and to characterize the complement of receivers which cover the frequency range of 30 Hz to 800 Hz and S-band at 2200 + or - 300 MHz. Sample results are presented to show the variability of electromagnetic effects associated with the orbiter and the time variability of these effects. The electric field and magnetic field maximum and minimum field strength spectra observed during the mission at the pallet location are plotted. Values are also derived for the maximum UHF transmitter and S-band transmitter field strengths. Calibration data to convert from the survey plots to actual narrowband and broadband field strengths are listed
Aerosol particle molecular spectroscopy
The molecular spectroscopy of a solution particle by structure resonance modulation spectroscopy is discussed [S. Arnold and A. B. Pluchino, "Infrared Spectrum of a Single Aerosol Particle by Photothermal Modulation of Structure Resonances," Appl. Opt. 21, 4194 (1982); S. Arnold et al., "Molecular Spectroscopy of a Single Aerosol Particle," Opt. Lett. 9, 4 (1984)]. Analytical equations are derived for time dependence of the particle radius as it interacts with a low intensity IR source (<20 mW/cm^2). This formalism is found to be in good agreement with pulsed experiments. Working equations for the spectroscopy are derived for both constant and periodic IR excitation
Strong Limit on a Variable Proton-to-Electron Mass Ratio from Molecules in the Distant Universe
The Standard Model of particle physics assumes that the so-called fundamental
constants are universal and unchanging. Absorption lines arising in molecular
clouds along quasar sightlines offer a precise test for variations in the
proton-to-electron mass ratio, mu, over cosmological time and distance scales.
The inversion transitions of ammonia are particularly sensitive to mu compared
to molecular rotational transitions. Comparing the available ammonia spectra
observed towards the quasar B0218+357 with new, high-quality rotational
spectra, we present the first detailed measurement of mu with this technique,
limiting relative deviations from the laboratory value to |dmu/mu| <
1.8x10^{-6} (95% confidence level) at approximately half the Universe's current
age - the strongest astrophysical constraint to date. Higher-quality ammonia
observations will reduce both the statistical and systematic uncertainties in
these measurements.Comment: Science, 20th June 2008. 22 pages, 5 figures (12 EPS files), 2
tables, including Supporting Online Material; v2: Corrected reference for
laboratory mu-variation bound
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