Sargent Williams | Florida State University (original) (raw)

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Papers by Sargent Williams

Research paper thumbnail of The Conquest of South American Inflation

Research paper thumbnail of An Electrophysiologic Evaluation of the Spinal Fluid Exchange Technic in Diminishing Spinal Anesthesia

Anesthesia and Analgesia, 1971

Research paper thumbnail of The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. III. Perseus Observed with IRAC

Astrophysical Journal, 2006

We present observations of 3.86 deg2 of the Perseus molecular cloud complex with the Spitzer Spac... more We present observations of 3.86 deg2 of the Perseus molecular cloud complex with the Spitzer Space Telescope Infrared Array Camera (IRAC). The maps show strong extended emission arising from shocked H2 in outflows and from polycyclic aromatic hydrocarbon features. More than 120,000 sources are extracted toward the cloud. Based on their IRAC colors and comparison to off-cloud and extragalactic fields, we identify 400 candidate young stellar objects. About two-thirds of these are associated with the young clusters IC 348 and NGC 1333, while the last third is distributed over the remaining cloud. The young stellar objects are classified according to the slope of their spectral energy distributions. Significant differences are found between the numbers of embedded Class I objects and more evolved Class II objects in IC 348, NGC 1333 and the remaining cloud, with the embedded Class I and ``flat-spectrum'' YSOs constituting 14%, 36% and 47% of the total number of YSOs identified in each of these regions. The high number of Class I objects in the extended cloud (61% of the Class I objects in the entire cloud) suggests that a significant fraction of the current star formation occurs outside the two main clusters. Finally, we discuss a number of outflows and identify their driving sources, including the deeply embedded Class 0 sources outside the two main clusters. The Class 0 objects are detected by Spitzer and have very red [3.6]-[4.5] colors, but they do not show similarly red [5.8]-[8.0] colors. The Class 0 objects are easily identifiable in color-color diagrams but are problematic to extract automatically due to the extended emission from shocked gas or scattered light in cavities related to the associated outflows.

Research paper thumbnail of End Group Analysis Accounts for the Low Molecular Weight Observed in the 1,3-Divinyltetramethyldisiloxane−Pt Complex Catalyzed Hydrosilylation Copolymerization of α,ω-Dienes and 1,3-Dihydridotetramethyldisiloxane

Macromolecules, 1999

In this paper, we report a study of the copolymerization of α,ω-dienes, eg, 1,5-hexadiene or 1,7-... more In this paper, we report a study of the copolymerization of α,ω-dienes, eg, 1,5-hexadiene or 1,7-octadiene, with 1,3-dihydridotetramethyldisiloxane using the Karstedt catalyst. Essentially quantitative yields of low molecular weight poly(2,2,9,9-tetramethyl-2,9-disila-1-oxa-...

Research paper thumbnail of Impacts of priors on convergence and escapes from Nash inflation

Review of Economic Dynamics, 2005

Recent papers have analyzed how economies with adaptive agents may converge to and escape from se... more Recent papers have analyzed how economies with adaptive agents may converge to and escape from self-confirming equilibria. These papers have imputed to agents a particular prior about drifting coefficients. In the context of a model of monetary policy, this paper analyzes dynamics that govern both convergence and escape under a more general class of priors for the government. We characterize how the shape of the prior influences possible cycles, convergence, and escapes. There are priors for which the E-stability condition is not enough to assure local convergence to a self-confirming equilibrium. Our analysis also isolates the source of differences in the sustainability of Ramsey inflation encountered in the analyses of and , on the one hand, and Cho, Williams, and Sargent , on the other.

Research paper thumbnail of Theory of a distributed feedback laser

IEEE Journal of Quantum Electronics, 1980

Research paper thumbnail of The Conquest of South American Inflation

Research paper thumbnail of An Electrophysiologic Evaluation of the Spinal Fluid Exchange Technic in Diminishing Spinal Anesthesia

Anesthesia and Analgesia, 1971

Research paper thumbnail of The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds. III. Perseus Observed with IRAC

Astrophysical Journal, 2006

We present observations of 3.86 deg2 of the Perseus molecular cloud complex with the Spitzer Spac... more We present observations of 3.86 deg2 of the Perseus molecular cloud complex with the Spitzer Space Telescope Infrared Array Camera (IRAC). The maps show strong extended emission arising from shocked H2 in outflows and from polycyclic aromatic hydrocarbon features. More than 120,000 sources are extracted toward the cloud. Based on their IRAC colors and comparison to off-cloud and extragalactic fields, we identify 400 candidate young stellar objects. About two-thirds of these are associated with the young clusters IC 348 and NGC 1333, while the last third is distributed over the remaining cloud. The young stellar objects are classified according to the slope of their spectral energy distributions. Significant differences are found between the numbers of embedded Class I objects and more evolved Class II objects in IC 348, NGC 1333 and the remaining cloud, with the embedded Class I and ``flat-spectrum'' YSOs constituting 14%, 36% and 47% of the total number of YSOs identified in each of these regions. The high number of Class I objects in the extended cloud (61% of the Class I objects in the entire cloud) suggests that a significant fraction of the current star formation occurs outside the two main clusters. Finally, we discuss a number of outflows and identify their driving sources, including the deeply embedded Class 0 sources outside the two main clusters. The Class 0 objects are detected by Spitzer and have very red [3.6]-[4.5] colors, but they do not show similarly red [5.8]-[8.0] colors. The Class 0 objects are easily identifiable in color-color diagrams but are problematic to extract automatically due to the extended emission from shocked gas or scattered light in cavities related to the associated outflows.

Research paper thumbnail of End Group Analysis Accounts for the Low Molecular Weight Observed in the 1,3-Divinyltetramethyldisiloxane−Pt Complex Catalyzed Hydrosilylation Copolymerization of α,ω-Dienes and 1,3-Dihydridotetramethyldisiloxane

Macromolecules, 1999

In this paper, we report a study of the copolymerization of α,ω-dienes, eg, 1,5-hexadiene or 1,7-... more In this paper, we report a study of the copolymerization of α,ω-dienes, eg, 1,5-hexadiene or 1,7-octadiene, with 1,3-dihydridotetramethyldisiloxane using the Karstedt catalyst. Essentially quantitative yields of low molecular weight poly(2,2,9,9-tetramethyl-2,9-disila-1-oxa-...

Research paper thumbnail of Impacts of priors on convergence and escapes from Nash inflation

Review of Economic Dynamics, 2005

Recent papers have analyzed how economies with adaptive agents may converge to and escape from se... more Recent papers have analyzed how economies with adaptive agents may converge to and escape from self-confirming equilibria. These papers have imputed to agents a particular prior about drifting coefficients. In the context of a model of monetary policy, this paper analyzes dynamics that govern both convergence and escape under a more general class of priors for the government. We characterize how the shape of the prior influences possible cycles, convergence, and escapes. There are priors for which the E-stability condition is not enough to assure local convergence to a self-confirming equilibrium. Our analysis also isolates the source of differences in the sustainability of Ramsey inflation encountered in the analyses of and , on the one hand, and Cho, Williams, and Sargent , on the other.

Research paper thumbnail of Theory of a distributed feedback laser

IEEE Journal of Quantum Electronics, 1980