2,666 research outputs found
Reconciliation of experimental and theoretical electric tensor polarizabilities of the cesium ground state
We present a new theoretical analysis of the strongly suppressed F- and
M-dependent Stark shifts of the Cs ground state hyperfine structure. Our
treatment uses third order perturbation theory including off-diagonal hyperfine
interactions not considered in earlier treatments. A numerical evaluation of
the perturbation sum using bound states up to n=200 yields ground state tensor
polarizabilities which are in good agreement with experimental values, thereby
bridging the 40-year-old gap between experiments and theory. We have further
found that the tensor polarizabilities of the two ground state hyperfine
manifolds have opposite signs, in disagreement with an earlier derivation. This
sign error has a direct implication for the precise evaluation of the blackbody
radiation shift in primary frequency standards.Comment: 7 pages, 2 figures, accepted for publication in Europhysics Letter
Timeline: The Founding of F-CHEC and Its Conduct of a MTA-Funded Research Project
The following timeline chronicles the formation of F-CHEC and the conduct of its first research project funded by the Citizens’ Monitoring and Technical Assessment (MTA) Fund.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1001/thumbnail.jp
F-CHEC Water Quality Database Overview
Document giving an overview of the Water Quality Database created by The Fernald Community Health Effects Committee, Inc. (F-CHEC) and the University of Cincinnati Environmental Health Foundation (UEHF). The database was part of the research aimed at identifying and reviewing existing information on contaminants of water in wells and cisterns within the five-mile exposure domain of the former Fernald Uranium Processing Plant.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1005/thumbnail.jp
Well Database Appendix
Appendix for the Well Database created by The Research Team (consisting of The Fernald Community Health Effects Committee, Inc. (F-CHEC) and the University of Cincinnati Environmental Health Foundation (UEHF)) to determine the location of each well within the five-mile exposure domain surrounding the former Fernald Uranium Processing Plant. The townships of interest were Fairfield, Morgan and Ross Townships in Butler County and Colerain, Crosby, Harrison and Whitewater Townships in Hamilton County.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1004/thumbnail.jp
Enhanced grain surface effect on magnetic properties of nanometric La0.7Ca0.3MnO3 manganite : Evidence of surface spin freezing of manganite nanoparticles
We have investigated the effect of nanometric grain size on magnetic
properties of single phase, nanocrystalline, granular La0.7Ca0.3MnO3 (LCMO)
sample. We have considered core-shell structure of our LCMO nanoparticles,
which can explain its magnetic properties. From the temperature dependence of
field cooled (FC) and zero-field cooled (ZFC) dc magnetization (DCM), the
magnetic properties could be distinguished into two regimes: a relatively high
temperature regime T > 40 K where the broad maximum of ZFC curve (at T = Tmax)
is associated with the blocking of core particle moments, whereas the sharp
maximum (at T = TS) is related to the freezing of surface (shell) spins. The
unusual shape of M (H) loop at T = 1.5 K, temperature dependent feature of
coercive field and remanent magnetization give a strong support of surface spin
freezing that are occurring at lower temperature regime (T < 40 K) in this LCMO
nanoparticles. Additionally, waiting time (tw) dependence of ZFC relaxation
measurements at T = 50 K show weak dependence of relaxation rate [S(t)] on tw
and dM/dln(t) following a logarithmic variation on time. Both of these features
strongly support the high temperature regime to be associated with the blocking
of core moments. At T = 20 K, ZFC relaxation measurements indicates the
existence of two different types of relaxation processes in the sample with
S(t) attaining a maximum at the elapsed time very close to the wait time tw =
1000 sec, which is an unequivocal sign of glassy behavior. This age-dependent
effect convincingly establish the surface spin freezing of our LCMO
nanoparticles associated with a background of superparamagnetic (SPM) phase of
core moments.Comment: 41 pages, 10 figure
How to Use the Well Database
Document giving an overview on how to use the Well Database created by The Fernald Community Health Effects Committee, Inc. (F-CHEC) and the University of Cincinnati Environmental Health Foundation (UEHF). The database was part of the research aimed at identifying and reviewing existing information on contaminants of water in wells and cisterns within the five-mile exposure domain of the former Fernald Uranium Processing Plant.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1006/thumbnail.jp
How to Use the Water Quality Database
Document giving an overview on how to use the Water Quality Database created by The Fernald Community Health Effects Committee, Inc. (F-CHEC) and the University of Cincinnati Environmental Health Foundation (UEHF). The database was part of the research aimed at identifying and reviewing existing information on contaminants of water in wells and cisterns within the five-mile exposure domain of the former Fernald Uranium Processing Plant.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1007/thumbnail.jp
Timeline: Key Events that Lead to the Installation of a Public Water Supply for Fernald Area Residents
A timeline that tracks the key events leading to the Installation of a public water supply for Fernald Area Residents.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1008/thumbnail.jp
Well Database Overview
The Fernald Community Health Effects Committee, Inc. (F-CHEC) partnered with the University of Cincinnati Environmental Health Foundation (UEHF) to conduct research aimed at identifying and reviewing existing information on contaminants of water in wells and cisterns in the five-mile exposure domain of the former Fernald uranium processing plant. The F-CHEC and UEHF partnership is hereinafter called the Research Team.
The Research Team determined that the existent information on well use in the five-mile exposure domain did not include either the number or the locations of offsite water wells within the exposure domain. Therefore, it was apparent that this project should include a database of offsite water wells within the five-mile exposure domain.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1003/thumbnail.jp
F-CHEC Cistern Survey Results
The Fernald Community Health Effects (F-CHEC) Cistern Use and Maintenance Survey was conducted to compile information about the historical and current use and maintenance patterns of Fernald area residents with cisterns.
This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works.
If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1002/thumbnail.jp
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