452 research outputs found
Optimal Placement of Multiple Interconnected Gateways in Heterogeneous Wireless Sensor Networks
Data c ollec ted b y sensors of ten h av e to b e rem otely d eliv ered th rou g h
m u lti- h op w ireless path s to d ata sink s c onnec ted to applic ation ser v ers for inform
ation proc essing . T h e position of th ese sink s h as a h u g e im pac t on th e q u ality
of th e spec i c W ireless S ensor N etw or k ( W S N ) . Ind eed , it m ay c reate ar ti c ial
traf c b ottlenec k s w h ic h affec t th e energ y ef c ienc y and th e W S N lifetim e. T h is
paper c onsid ers a h eterog eneou s netw or k sc enar io w h ere w ireless sensors d eliv
er d ata to inter m ed iate g atew ay s g eared w ith a d iv erse w ireless tec h nolog y
and inter c onnec ted tog eth er and to th e sink . An optim iz ation f ram ew or k b ased
on Integ er L inear P rog ram m ing (IL P ) is d ev eloped to loc ate w ireless g atew ay s
m inim iz ing th e ov erall installation c ost and th e energ y c onsu m ption in th e W S N ,
w h ile ac c ou nting for m u lti- h op c ov erag e b etw een sensors and g atew ay s, and c onnec
tiv ity am ong w ireless g atew ay s. T h e proposed IL P for m u lations are solv ed to
optim ality for m ed iu m -siz e instanc es to analy z e th e q u ality of th e d esig ned netw
or k s, and h eu r istic alg or ith m s are also proposed to tac k le larg e-sc ale h eterog eneou
s sc enar ios
Measurements of the observed cross sections for exclusive light hadrons containing at , 3.650 and 3.6648 GeV
By analyzing the data sets of 17.3, 6.5 and 1.0 pb taken,
respectively, at , 3.650 and 3.6648 GeV with the BES-II
detector at the BEPC collider, we measure the observed cross sections for
, , ,
and at the three energy
points. Based on these cross sections we set the upper limits on the observed
cross sections and the branching fractions for decay into these
final states at 90% C.L..Comment: 7 pages, 2 figure
Partial wave analysis of J/\psi \to \gamma \phi \phi
Using events collected in the BESII detector, the
radiative decay is
studied. The invariant mass distribution exhibits a near-threshold
enhancement that peaks around 2.24 GeV/.
A partial wave analysis shows that the structure is dominated by a
state () with a mass of
GeV/ and a width of GeV/. The
product branching fraction is: .Comment: 11 pages, 4 figures. corrected proof for journa
Direct Measurements of Absolute Branching Fractions for D0 and D+ Inclusive Semimuonic Decays
By analyzing about 33 data sample collected at and around 3.773
GeV with the BES-II detector at the BEPC collider, we directly measure the
branching fractions for the neutral and charged inclusive semimuonic decays
to be and , and determine the ratio of the two branching
fractions to be
Measurements of the observed cross sections for exclusive light hadron production in e^+e^- annihilation at \sqrt{s}= 3.773 and 3.650 GeV
By analyzing the data sets of 17.3 pb taken at GeV
and 6.5 pb taken at GeV with the BESII detector at the
BEPC collider, we have measured the observed cross sections for 12 exclusive
light hadron final states produced in annihilation at the two energy
points. We have also set the upper limits on the observed cross sections and
the branching fractions for decay to these final states at 90%
C.L.Comment: 8 pages, 5 figur
Measurements of psi(2S) decays to octet baryon-antibaryon pairs
With a sample of 14 million psi(2S) events collected by the BESII detector at
the Beijing Electron Positron Collider (BEPC), the decay channels psi(2S)->p
p-bar, Lambda Lambda-bar, Sigma0 Sigma0-bar, Xi Xi-bar are measured, and their
branching ratios are determined to be (3.36+-0.09+-0.24)*10E-4,
(3.39+-0.20+-0.32)*10E-4, (2.35+-0.36+-0.32)*10E-4, (3.03+-0.40+-0.32)*10E-4,
respectively. In the decay psi(2S)->p p-bar, the angular distribution parameter
alpha is determined to be 0.82+-0.17+-0.04.Comment: 8 pages, 8 figure
First observation of J/\psi and \psi(2S) decaying to n K^0_S\bar\Lambda +c.c
The decays of \jpsi and \psip to are
observed and measured for the first time, and the perturbative QCD ``12%'' rule
is tested, based on \jpsi and \psip
events collected with BESII detector at the Beijing Electron-Positron Collider.
No obvious enhancement near threshold in \jpsi \to
{n}{K^0_S}\bar{\Lambda}+c.c. is observed, and the upper limit on the branching
ratio of \jpsi \to {K^0_S} X, X \to n \bar \Lambda is determined.Comment: 10 pages, 10 figure
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