574 research outputs found
Fiskeriundersøkelser ved Bjørnøya, Spitsbergen og i Barentshavet 1. - 27. juni 1971
Distribution and abundance of the commercial important species in the investigated area were observed. Special attention was paid to the prerecruits of cod, haddock and redfish. Polar cod and capelin were also studied. The acoustic instruments
were continuously used. Trawling with bottom and pelagic trawls was carried out for fish sampling and identification of echo recordings.
A low abundance of the 1970 year-class of cod was observed and the abundance was lower than that observed for the 1969 year-class. These findings disagree with observations made during the International 0-group fish surveys in August—September 1969 and 1970 and during a Norwegian survey in November 1970. Three factors are considered responsible for these
unexpected observations. I: A part of the 1970 year-class might in June 1971 have been living together with capelin in the
upper 100 to 150 m, and the abundance might therefore have been underestimated. 2: Some part of the year-class might during the autumn and early winter 1970 — 1971 have been transported outside the investigated area. 3: The abundance
of the year-class might during the winter 1970—1971 have been reduced by an unusual high natural mortality.
Prerecruits of cod and haddock and the youngest prerecruits of redfish were in June recorded both near the bottom and pelagic. It could not be classified if this distribution reflects a vertical diurnal migration, but this type of migrations is established during late autumn and late winter for prerecruits. June might therefore not be a very suitable time to observe the abundance of prerecruits
The NuMI Neutrino Beam and Potential for an Off-Axis Experiment
The Neutrinos at the Main Injector (NuMI) facility at Fermilab is under
construction and due to begin operations in late 2004. NuMI will deliver an
intense beam of variable energy 2-20 GeV directed into the Earth at
58 mrad. Several aspects of the design are reviewed, and potential limitations
to the ultimate neutrino flux are described. In addition, potential
measurements of neutrino mixing properties are described.Comment: talk given at NuFact '02, Imperial College London, proceedings to
appear in J. Phys. G, revised to add a referenc
Acoustic abundance estimation of cod and haddock in the Barents Sea in February 1976
From l to 20 February observations of cod and haddock were carried out
by R.V. "G.O. Sars" in the centra1 and eastern part of the Barents Sea.
The survey was part of a program with the aim of estimating the abundance
of young cod and haddock by an acoustic method. The results from
the survey is presented in this report together with a brief description of
the method used to establish abundance estimates of young cod and
haddock
Fisheries investigations in the waters off Bear Island, Spitsbergen and in the Barents Sea 1 - 27 June 1971
Distribution and abundance of the commercial important species in the investigated area were observed. Special attention was paid to the prerecruits of cod, haddock and redfish. Polar cod and capelin were also studied. The acoustic instruments
were continuously used. Trawling with bottom and pelagic trawls was carried out for fish sampling and identification of echo recordings.
A low abundance of the 1970 year-class of cod was observed and the abundance was lower than that observed for the 1969 year-class. These findings disagree with observations made during the International 0-group fish surveys in August—September 1969 and 1970 and during a Norwegian survey in November 1970. Three factors are considered responsible for these
unexpected observations. I: A part of the 1970 year-class might in June 1971 have been living together with capelin in the
upper 100 to 150 m, and the abundance might therefore have been underestimated. 2: Some part of the year-class might during the autumn and early winter 1970 — 1971 have been transported outside the investigated area. 3: The abundance
of the year-class might during the winter 1970—1971 have been reduced by an unusual high natural mortality.
Prerecruits of cod and haddock and the youngest prerecruits of redfish were in June recorded both near the bottom and pelagic. It could not be classified if this distribution reflects a vertical diurnal migration, but this type of migrations is established during late autumn and late winter for prerecruits. June might therefore not be a very suitable time to observe the abundance of prerecruits
Beam-Based Alignment of the NuMI Target Station Components at FNAL
The Neutrinos at the Main Injector (NuMI) facility is a conventional
horn-focused neutrino beam which produces muon neutrinos from a beam of mesons
directed into a long evacuated decay volume. The relative alignment of the
primary proton beam, target, and focusing horns affects the neutrino energy
spectrum delivered to experiments. This paper describes a check of the
alignment of these components using the proton beam.Comment: higher resolution figures available on Fermilab Preprint Server (see
SPIRES entry), accepted for publication in Nucl. Instr. and Meth.
Experiment Simulation Configurations Used in DUNE CDR
The LBNF/DUNE CDR describes the proposed physics program and experimental
design at the conceptual design phase. Volume 2, entitled The Physics Program
for DUNE at LBNF, outlines the scientific objectives and describes the physics
studies that the DUNE collaboration will perform to address these objectives.
The long-baseline physics sensitivity calculations presented in the DUNE CDR
rely upon simulation of the neutrino beam line, simulation of neutrino
interactions in the far detector, and a parameterized analysis of detector
performance and systematic uncertainty. The purpose of this posting is to
provide the results of these simulations to the community to facilitate
phenomenological studies of long-baseline oscillation at LBNF/DUNE.
Additionally, this posting includes GDML of the DUNE single-phase far detector
for use in simulations. DUNE welcomes those interested in performing this work
as members of the collaboration, but also recognizes the benefit of making
these configurations readily available to the wider community.Comment: 9 pages, 4 figures, configurations in ancillary file
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