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Author: kevin coakley
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1. A Weekly Cycle in Atmospheric Carbon Dioxide
R S Cerveny, Kevin J Coakley
We present a new statistic called the Mean Symmetrized Residual (MSR) for detection and quantification of a weekly cycle in measured daily atmospheric carbon dioxide (CO^d2^). At the Mauna Loa Observatory in Hawaii, we conclude that CO^d2^ concentra ...
2. A gamma and X-ray dector for cryogenic, high magnetic field applications
Thomas R. Gentile, R L Cooper, R. Alarcon, M J Bales, E J Beise, H Breuer, J. Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, Changbo Fu, Hans P Mumm, Jeffrey S Nico, Brian O'Neill, K. Pulliam, Alan K Thompson, F E. Wietfeldt
As part of an experiment to measure the spectrum of photons emitted in beta-decay of the free neu-
tron, we developed and operated a detector consisting of 12 bismuth germanate (BGO) crystals coupled to
avalanche photodiodes (APDs). The detector wa ...
3. Adaptive Characterization of Jitter Noise in Sampled High-Speed Signals
Kevin J Coakley, Chih-Ming Wang, Paul D Hale, Tracy S. Clement
We estimate the root-mean-square (RMS) value of timing jitter noise in simulated signals similar to measured high-speed sampled signals. The simulated signals are contaminated by additive noise, timing jitter noise, and time shift errors. Before e ...
4. Adaptive Use of Prior Information in Inverse Problems: An Application to Neutron Depth Profiling
M Levenson, Kevin J Coakley
A flexible class of Bayesian models is proposed to solve linear inverse problems. The models generalize linear regularization methods such as Tikhonov regularization and are motivated by the ideas of the image restoration model of Johnson et al. (19 ...
5. Adaptive and robust statistical methods for processing near-field scanning microwave microscopy images
Kevin J Coakley, Samuel Berweger, Atif (Atif) Imtiaz, Thomas M Wallis, Joel C. Weber, Pavel Kabos
Near-field scanning microwave microscopy offers great potential to facilitate characterization, development and modeling of materials. By acquiring microwave images at multiple frequencies and amplitudes (along with the other modalities) one can stud ...
6. Alignment of Noisy Signals
Kevin J Coakley, Paul D Hale
We study the relative performance of various methods for aligning noisy one dimensional signals. In each method, we estimate the relative shifts of a set of signals which are translated with respect to each other. We simulate signals corrupted by bot ...
7. An experiment for the precision measurement of the radiative decay mode of the neutron
R Cooper, Christopher D. Bass, E Beise, H Breuer, J Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, B Fisher, Changbo Fu, Thomas R. Gentile, M. McGonagle, Hans P Mumm, Jeffrey S Nico, Alan K Thompson, F E. Wietfeldt
The neutron typically beta decays into a proton, electron, and antineutrino. In some
decays, it can be accompanied by a high energy photon. We recently performed the
rst observation of the radiative beta decay branch for the free neutron with phot ...
8. Analysis of uncertainty in particle mass measurement using an aerosol particle mass analyzer
Kensei Ehara, Hiromu Sakurai, Akira Yabe, Naoko Tajima, Kevin J Coakley
The aerosol particle mass analyzer (APM) classifies aerosol particles according to their mass-to-charge ratio (Ehara et al., 1996). Particle mass can be measured by use of the APM in combination with a condensation particle counter. Being a balance m ...
9. Calibration of a Stopping Power Model for Silicon Based on Analysis of Neutron Depth Profiling and Secondary Ion Mass Spectrometry Measurements
Kevin J Coakley, Huaiyu H Chen-Mayer, George Paul Lamaze, David S Simons, P E Thompson
We measure the boron concentration versus depth profile within a silicon sample with four delta-doped planes by secondary ion mass spectrometry. In a neutron depth profiling (NDP) experiment, we illuminate the sample with a neutron beam. Nuclear re ...
10. Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons
Journal of Research (NIST JRES)
Kevin J Coakley, J M Doyle, S N Dzhosyuk, L Yang, Paul R Huffman
We compute classical trajectories of ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and positio ...