12 research outputs found
Phenomenology of AdS/QCD and Its Gravity Dual
We construct the dilaton potential in the gravity dual theory of AdS/QCD for
the warp factor of Refs.{1,2}. Using this AdS_5-metric with properties similar
to QCD, we find that the gravity dual leads to a meaningful gauge coupling in
the region between the charmonium and bottonium mass, but differs slightly from
QCD in the extreme UV. When we fix the ultraviolet behavior in accord with the
beta-function, we can obtain good agreement with the overall heavy
quark-antiquark potential. Although the leading order proportional to
-\alpha^{4/3}/r differs from perturbative QCD, the full potential agrees quite
well with the short distance QCD potential in NNLO.Comment: 42 pages, 13 figures, 1 tabl
Wilson Loop-Loop Correlators in AdS/QCD
We calculate the expectation value of one circular Wilson loop and the
correlator of two concentric circular Wilson loops in AdS/QCD using the
modified AdS_5-metric given in Ref.[1]. The confinement properties of this
metric in AdS/QCD are analyzed and compared with QCD and Nambu-Goto theory in
four dimensions.Comment: 22 pages, 14 figure
Strangeness Enhancement in and Interactions at SPS Energies
The systematics of strangeness enhancement is calculated using the HIJING and
VENUS models and compared to recent data on , and
collisions at CERN/SPS energies (). The HIJING model is used to
perform a {\em linear} extrapolation from to . VENUS is used to
estimate the effects of final state cascading and possible non-conventional
production mechanisms. This comparison shows that the large enhancement of
strangeness observed in collisions, interpreted previously as possible
evidence for quark-gluon plasma formation, has its origins in non-equilibrium
dynamics of few nucleon systems. % Strangeness enhancement %is therefore traced
back to the change in the production dynamics %from to minimum bias
and central collisions. A factor of two enhancement of at
mid-rapidity is indicated by recent data, where on the average {\em one}
projectile nucleon interacts with only {\em two} target nucleons. There appears
to be another factor of two enhancement in the light ion reaction relative
to , when on the average only two projectile nucleons interact with two
target ones.Comment: 29 pages, 8 figures in uuencoded postscript fil
VOC amounts in ambient areas of a high-technology science park in Taiwan: their reciprocal correlations and impact on inhabitants
This study presents bihourly, seasonal, and yearly concentration changes in volatile organic compounds (VOCs) in the inlet and effluent water of the wastewater treatment plant (WWTP) of a high-technology science park (HTIP) in Taiwan, with the VOC amounts at different sites correlated geologically. This research adopted a combination of two systems, solid-phase microextraction with a gas chromatography/flame ionization detector and an assembly of purge and trap coupled with gas chromatography/mass spectrometry, to monitor polar and nonpolar VOCs in wastewater. This paper investigated the total VOCs, acetone, isopropyl alcohol (IPA), and dimethylsulfide (DMS) concentrations in real water samples collected in the ambient area of the HTIP. The major contents of VOCs measured in the effluent of the WWTP in the HTIP and the surrounding river region were DMS (14-176 ppb), acetone (5-95 ppb), and IPA (15-316 ppb). In comparison with the total VOCs in the inlet wastewater of the WWTP, no corresponding relationship for total VOC concentration in the wastewater was observed between the inlet water and effluent water of the WWTP. The peak VOC concentrations appeared in the third season, and the correlation of different VOC amounts reflects the production situation of the factories. In addition, VOC concentrations at different sites indicate that the Ke-Ya River is seemingly an effective channel for transporting wastewater to its final destination. The data are good indications for the management of environmental pollution near the HTIP