25,037 research outputs found
Earth's surface fluid variations and deformations from GPS and GRACE in global warming
Global warming is affecting our Earth's environment. For example, sea level
is rising with thermal expansion of water and fresh water input from the
melting of continental ice sheets due to human-induced global warming. However,
observing and modeling Earth's surface change has larger uncertainties in the
changing rate and the scale and distribution of impacts due to the lack of
direct measurements. Nowadays, the Earth observation from space provides a
unique opportunity to monitor surface mass transfer and deformations related to
climate change, particularly the global positioning system (GPS) and the
Gravity Recovery and Climate Experiment (GRACE) with capability of estimating
global land and ocean water mass. In this paper, the Earth's surface fluid
variations and deformations are derived and analyzed from global GPS and GRACE
measurements. The fluids loading deformation and its interaction with Earth
system, e.g., Earth Rotation, are further presented and discussed.Comment: Proceeding of Geoinformatics, IEEE Geoscience and Remote Sensing
Society (GRSS), June 24-26, 2011, Shanghai, Chin
New predictions on the mass of the light hybrid meson from QCD sum rules
We calculate the coefficients of the dimension-8 quark and gluon condensates
in the current-current correlator of light hybrid current
. With inclusion of these
higher-power corrections and updating the input parameters, we re-analyze the
mass of the light hybrid meson from Monte-Carlo based QCD sum rules.
Considering the possible violation of factorization of higher dimensional
condensates and variation of , we obtain a conservative
mass range 1.72--2.60\,GeV, which favors as a better hybrid
candidate compared with and .Comment: 12pages, 2 figures, the version appearing in JHE
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