22,858 research outputs found
Liver dysfunction in patients with IBD under immunosuppressive treatment: do we need to fear?
International audienc
Diablo Canyon power plant site ecological study Quarterly Report no. 17: July 1 - September 30, 1977
During the quarter a total of 38 random 30-m2
and 152 random 1/4-m2 subtidal stations were
surveyed. Red abalone, Haliotis rufescens,
densities remained very low. There was a continued
decline in densities of giant red sea
urchins, Strongylocentrotus franciscanus, in
Diablo Cove as well as the North Control area.
The annual shore census of bull kelp, Nereocystis
luetkeana, revealed the lowest number of plants
in the surface canopy in Diablo Cove since 1973. The subtidal station data supported this observation.
Sea otter, Enhydra lutris, observations were
continued. A small group of otters continued
to raft in the Cove east of Lion Rock. Some
of these otters probably forage as far south as
South Cove.
The survey of 11 random intertidal stations
completed our Upwelling sampling effort. (16pp.
Wage-Price Dynamics and Deflation in Hong Kong
This paper provides empirical evidence on the dynamics of prices and wages in Hong Kong. The results imply that the deflation in Hong Kong since 1997 can be understood using a conventional macroeconomic framework wherein foreign influences constitute the basic underlying shocks, and adjustment processes in domestic wages and prices determine the details of the transmission mechanism. Our results indicate that the decline in local nominal prices owes much to declining prices of imported intermediate goods. The negative output gap and the increase in unemployment experienced during the deflation period also have their origin in foreign shocks, but the domestic wage adjustment process constitutes an important contributing factor.Deflation, wage-price dynamics, Hong Kong data.
Global Action-Angle Variables for Non-Commutative Integrable Systems
In this paper we analyze the obstructions to the existence of global
action-angle variables for regular non-commutative integrable systems (NCI
systems) on Poisson manifolds. In contrast with local action-angle variables,
which exist as soon as the fibers of the momentum map of such an integrable
system are compact, global action-angle variables rarely exist. This fact was
first observed and analyzed by Duistermaat in the case of Liouville integrable
systems on symplectic manifolds and later by Dazord-Delzant in the case of
non-commutative integrable systems on symplectic manifolds. In our more general
case where phase space is an arbitrary Poisson manifold, there are more
obstructions, as we will show both abstractly and on concrete examples. Our
approach makes use of a few new features which we introduce: the action bundle
and the action lattice bundle of the NCI system (these bundles are canonically
defined) and three foliations (the action, angle and transverse foliation),
whose existence is also subject to obstructions, often of a cohomological
nature
Characterization of radially symmetric finite time blowup in multidimensional aggregation equations,
This paper studies the transport of a mass in by a
flow field . We focus on kernels for
for which the smooth densities are known to develop
singularities in finite time. For this range This paper studies the transport
of a mass in by a flow field . We
focus on kernels for for which the
smooth densities are known to develop singularities in finite time. For this
range we prove the existence for all time of radially symmetric measure
solutions that are monotone decreasing as a function of the radius, thus
allowing for continuation of the solution past the blowup time. The monotone
constraint on the data is consistent with the typical blowup profiles observed
in recent numerical studies of these singularities. We prove monotonicity is
preserved for all time, even after blowup, in contrast to the case
where radially symmetric solutions are known to lose monotonicity. In the case
of the Newtonian potential (), under the assumption of radial
symmetry the equation can be transformed into the inviscid Burgers equation on
a half line. This enables us to prove preservation of monotonicity using the
classical theory of conservation laws. In the case and at
the critical exponent we exhibit initial data in for which the
solution immediately develops a Dirac mass singularity. This extends recent
work on the local ill-posedness of solutions at the critical exponent.Comment: 30 page
Is There a Euro Effect on Trade? An Application of End-of-Sample Structural Break Tests for Panel Data
Whether trade has increased due to the Euro is a question at the heart of lively policy debates and academic research. We revisit the question with a new, more powerful econometric test for end-of-sample breaks to formally identify the timing and duration of the structural break implied by the ÒRose effectÓ on the Euro AreaÕs trade. We find a significant break in 1999Q1 when using a traditional gravity equa- tion, corroborating the general consensus in the literature. However, we find that this break is short lived. Furthermore, we show that the break can be explained both by the marked decrease in real interest rates across the Euro Area and by deepening European institutional integration.Gravity equation, International Trade, Common Currency, Structural break tests in panel data, Euro Area
Diablo Canyon power plant site ecological study Annual Report July 1, 1976 - June 30, 1977 and Quarterly Report no. 16 April 1, 1977 - June 30, 1977
More stations were surveyed during this report period
than during any previous period. A total of 818 mandays
was spent surveying 18 permanent and 67 random
subtidal stations, 19 permanent and 50 random intertidal
stations, and 64 sportfish catch-per-unit-of-effort
stations, as well as conducting corollary laboratory
work.
In the subtidal areas, Laminaria dentigera and Pterygophora
californica, both important subsurface kelp
species, increased in their combined total numbers from
the 1976 survey. However, Nereocystis luetkeana, the
bull kelp, declined substantially in all study areas.
Population trends of many of the dominant subtidal
macro-invertebrates have varied depending on the species
and on the type of method utilized. Regression analyses
have been performed on selected species for numbers
versus depth. Red algal abundance and diversity appear
to have increased in both subtidal study areas.
Of the three observation areas, sea otters were observed
least frequently in Diablo Cove. However, there continues
to be fresh evidence of otter foraging within
Diablo Cove.
Several seasons' data for intertidal algae and invertebrates have been summarized for one study area. While the algae biomass shows a fairly clear seasonality of
abundance, the trends in numbers of the six invertebrate
species considered are not as well defined.
Because of high variability in the data, the sportfish
catch-per-unit-of-effort and hook-and-line study was
cancelled in December.
Populations of intertidal red and black abalones,
Haliotis rufescens and H. cracherodii, respectively,
appear to have remained fairly stable during the
1976-77 period.
Two other ancillary studies were also terminated during
this period: interviews of commercial abalone and
urchin fishermen, and observations of foam in Diablo Cove. (107pp.
Mendocino Power Plant site ecological study annual report; July 1, 1971 to December 31, 1972
This report is the first annual report submitted in partial
fulfillment of Research Contract No. S-1902 between the Department of Fish and Game and the Pacific Gas and Electric Company. Through this contract the Department of Fish and Game is to conduct a preoperational ecological study to establish a base line inventory of the marine biota with special reference to fish and to abalone,
including food chains.
This first annual report covers all work from September 1971 through December 1972.
This annual report covers the first 18 month period of the project from July 1, 1971 through December 31, 1972. The report includes results (discussion and tables) of our subtidal, intertidal, sportfishery, fish collection, fish food habit, and plankton studies. The quarterly report
for October 1 to December 31, 1972 is included herein and these data are incorporated in this annual report. (86pp.
Mendocino power plant site ecological study, Quarterly Report No. 5; July 1 - September 30, 1972
This report is the fifth quarterly report submitted in
partial fulfillment of Research Contract No. S-1902 between the Department of Fish and Game and the Pacific Gas and
Electric Company. Through this contract the Department of Fish and Game is to conduct a pre-operational ecological study to establish a base line inventory of the marine biota
with special reference to fish and to abalone, including food chains.
Quarterly reports will be followed by annual reports. The
first annual report will cover all work from September 1971 through December 1972. Full tables and species lists will be included in each annual report
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