2,412 research outputs found
Charmless B Decays Involving Vector Mesons in Belle
Using the data sample of 10.5 fb-1 collected by the Belle detector, we
searched for two-body charmless decays involving vector mesons. The clear
signal signature of B+ -> phi K+ is seen and its branching fraction is measured
to be (1.39+.32-.30 +- 0.2) X 10-5. The evidence for B+ -> rho pi+, B0 -> rho-
pi+ and B+ -> phi K*+ is reported and their branching fractions are determined.
No significant signals are observed for B0 -> phi K0S, -> phi K*0, -> rho- K+,
B+ -> rho K+, -> omega pi+ and -> omega K+ only the 90% C.L. upper limits are
given.Comment: 4 pages, Proceedings of the 4th International Conference on B Physics
& CP Violation, Ise-Shima, Japan, February 19 - 23, 200
Baseline tests of the EVA change-of-pace coupe electric passenger vehicle
The EVA Change-of-Pace Coupe, is an electric passenger vehicle, to characterize the state-of-the-art of electric vehicles. The EVA Change-of-Pace Coupe is a four passenger sedan that has been coverted to an electric vehicle. It is powered by twenty 6 volt traction batteries through a silicon controlled rectifier chopper controller actuated by a foot throttle to change the voltage applied to the series wound, direct current motor. Braking is accomplished with a vacuum assist hydraulic braking system. Regenerative braking is also provided
Euhrychiopsis lecontei distribution, abundance, and experimental augmentations for Eurasian watermilfoil control in Wisconsin lakes
The specialist aquatic herbivore Euhrychiopsis lecontei (Dietz)
is currently being researched as a potential biological control
agent for Eurasian watermilfoil (Myriophyllum spicatum L.).
Our research in Wisconsin focused on 1) determining milfoil
weevil distribution across lakes, 2) assessing limnological
characteristics associated with their abundance, and 3) evaluating
milfoil weevil augmentation as a practical management
tool for controlling Eurasian watermilfoil
New Records for \u3ci\u3eEuhrychiopsis Lecontei\u3c/i\u3e (Coleoptera: Curculionidae) and Their Densities in Wisconsin Lakes
The native aquatic weevil, Euhrychiopsis lecontei is currently being researched as a potential biological control for the exotic aquatic macrophyte Eurasian watermilfoil (Myriophyllum spicatum), yet little is known about its specific distribution in North America. In this study, E. lecontei was collected in 25 of 27 lakes surveyed for the weevil in Wisconsin, greatly increasing the known distribution of the species in this state. E. lecontei densities evaluated in 14 Wisconsin lakes ranged from \u3c0.01 to 1.91 weevils per apical stem of milfoil. These new records indicate that E. lecontei is widespread throughout Wisconsin and is associated with natural declines of M. spicatum in some lakes. Additional sampling for E. lecontei and research on its ecology and life history are needed to understand the role of this organism in aquatic ecosystems
Space transfer with ground-based laser/electric propulsion
A new method of providing power to space vehicles consists of using ground-based lasers to beam power to photovoltaic receivers in space. This can be used as a power source for electrically propelled orbital transfer vehicles
Intermittency in a single event
The possibility to study intermittency in a single event of high multiplicity
is investigated in the framework of the model. It is found that, for
cascade long enough, the dispersion of intermittency exponents obtained from
individual events is fairly small. This fact opens the possibility to study the
distribution of the intermittency parameters characterizing the cascades seen
(by observing intermittency) in particle spectra.Comment: 7 pages, latex, 2 figures available on request by e-mai
Temporal and spatial changes in milfoil distribution and biomass associated with weevils in Fish Lake, WI
During the course of an eight year monitoring effort, the
Wisconsin Department of Natural Resources documented a
significant decline in milfoil biomass and distribution in Fish
Lake, Wisconsin. Average milfoil biomass declined by 40-
50% from 374-524 g dw m
-2
during 1991-93 to 265 g dw m
-2
during both 1994 and 1995. Milfoil recovered fully in 1996-
98 to 446- 564 g dw m
-2
. The size of the milfoil bed, as discerned
from aerial photographs, shrank from a maximum
coverage of 40 ha in 1991 to less than 20 ha during 1995.
During the âcrashâ of 1994-95, milfoil plants exhibited typical
signs of weevil-induced damage, including darkened, brittle,
hollowed-out growing tips, and the arching and collapse
of stems associated with loss of buoyancy. Monitoring of weevils
and stem damage during 1995-98 showed highest densities
and heaviest damage occurred near shore and subsequently
fanned out into deeper water from core infestation
sites each spring. The extent of milfoil stem damage was positively
correlated with weevil densities (monthly sampling).
However, weevil densities and stem damage were lower during
1995 (when milfoil biomass was in decline) than during
1996-98 (when milfoil biomass was fully recovered)
Dispersive effects in neutron matter superfluidity
The explicit energy dependence of the single particle self-energy (dispersive
effects), due to short range correlations, is included in the treatment of
neutron matter superfluidity. The method can be applied in general to strong
interacting fermion systems, and it is expected to be valid whenever the
pairing gap is substantially smaller than the Fermi kinetic energy. The results
for neutron matter show that dispersive effects are strong in the density
region near the gap closure.Comment: 9 pages, 4 ps figure
Hidden asymmetry and forward-backward correlations
A model-independent method of studying the forward-backward correlations in
symmetric high energy processes is developed. The method allows a systematic
study of properties of various particle sources and to uncover asymmetric
structures hidden in symmetric hadron-hadron and nucleus-nucleus inelastic
reactions.Comment: 11 pages, no figure
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