508 research outputs found
Hypoglycemia in the Dog
On August 20, 1969, a 9 1/2 year old spayed female German Shepherd crossbred dog was presented. The patient had the following anamnesis: The animal had been noticed to be lame in the hind quarters, particularly in the morning. The owner stated that the dog seemed to warm out of the lameness as the day went on. The dog had been sleeping more than usual the previous few days and acted very weak at times. There had been polydypsia, polyuria, and polyphagia for the previous few weeks
Flight Set 360T004 (STS-30) Insulation Component, Interim Release, Volume 3
The insulation component of the Redesigned Solid Rocket Motor (RSRM) is discussed. The results of all visual evaluations and a thermal safety factor analysis are given. The data contained here supersedes the interim release and the insulation data presented in the Clearfield 10 day report. The objective is to document the postflight condition of the internal and external insulation of nozzle to case joints, the case field joints, the igniter to case joints, and the acreage insulation which made up RSRM-4A and RSRM-4B
Space Station and Space Cabin Testing
For Earth Orbiting Space Stations neither expandable, extensible, nor converted propellant tanks appear as suitable for manned operations as a specially designed cabin regardless of the mission to be performed. While an interesting possibility, use of converted propellant tanks offer little advantage when viewed in the light of the overall space station system problem.
During the past two years studies have been conducted in some depth of the cabins associated with space station systems suitable for launch by Titan III C, Saturn IB, and Saturn 5 boosters. These studies have considered various crew complements, supporting ferries f and the effects of rotation for the generation of artificial G .
Considering the requirements for integrating power supplies, thermal control* life support, attitude control, orbit propulsion, specific mission equipment, rendezvous, docking, communications, navigation, and crew creature comforts, the development of an efficient usable cabin becomes a task of significant proportions. Applying the constraints of removable and storable equipment to the fixed sizes and shapes of booster tankage makes the problem more difficult, the results less than optimum, and the increased cost substantial
Idempotent ideals and non-finitely generated projective modules over integral group rings of polycyclic-by-finite groups
We prove that every non-finitely generated projective module over the
integral group ring of a polycyclic-by-finite group G is free if and only if G
is polycyclic.Comment: 15 pages, to appear in J. Algebr
Reversible skew laurent polynomial rings and deformations of poisson automorphisms
A skew Laurent polynomial ring S = R[x(+/- 1); alpha] is reversible if it has a reversing automorphism, that is, an automorphism theta of period 2 that transposes x and x(-1) and restricts to an automorphism gamma of R with gamma = gamma(-1). We study invariants for reversing automorphisms and apply our methods to determine the rings of invariants of reversing automorphisms of the two most familiar examples of simple skew Laurent polynomial rings, namely a localization of the enveloping algebra of the two-dimensional non-abelian solvable Lie algebra and the coordinate ring of the quantum torus, both of which are deformations of Poisson algebras over the base field F. Their reversing automorphisms are deformations of Poisson automorphisms of those Poisson algebras. In each case, the ring of invariants of the Poisson automorphism is the coordinate ring B of a surface in F-3 and the ring of invariants S-theta of the reversing automorphism is a deformation of B and is a factor of a deformation of F[x(1), x(2), x(3)] for a Poisson bracket determined by the appropriate surface
Irreducible actions and compressible modules
Any finite set of linear operators on an algebra yields an operator
algebra and a module structure on A, whose endomorphism ring is isomorphic
to a subring of certain invariant elements of . We show that if is
a critically compressible left -module, then the dimension of its
self-injective hull over the ring of fractions of is bounded by the
uniform dimension of and the number of linear operators generating .
This extends a known result on irreducible Hopf actions and applies in
particular to weak Hopf action. Furthermore we prove necessary and sufficient
conditions for an algebra A to be critically compressible in the case of group
actions, group gradings and Lie actions
Impact of Medicare denials on noninvasive vascular diagnostic testing
AbstractPurpose: The purpose of this study was to evaluate the impact of Medicare coverage limitations and claim denials on noninvasive vascular diagnostic testing. Methods: All Medicare claims for noninvasive vascular diagnostic studies from January 1, 1999, to December 31, 1999, were identified from the hospital billing database according to Current Procedural Terminology codes for carotid artery duplex ultrasound scan, venous duplex ultrasound scan, and lower-extremity arterial Doppler scan. Reasons for Medicare denial of payment for these tests were reviewed and a cost analysis was performed. Results: During the 1-year period, there were 1096 noninvasive vascular diagnostic studies performed on Medicare patients. Of these 1096 tests, 176 (16.1%) were denied by Medicare (19.6% of 408 carotid duplex ultrasound scans, 16.8% of 345 venous duplex ultrasound scans, and 11.1% of 343 lower-extremity arterial Doppler scans). Of the noninvasive vascular tests denied by Medicare, an abnormal result was present in 72.5% of carotid duplex ultrasound scans, 32.8% of venous duplex ultrasound scans, and 78.9% of lower-extremity arterial Doppler scans. Overall, 88.1% of all initially denied claims (N = 176) were ultimately reimbursed by Medicare after resubmission, including 77.1% of the 118 claims denied based on compliance rules for “medical necessity.” Conclusion: Because of coverage limitations, Medicare denials of noninvasive vascular diagnostic tests can lead to potential uncompensated physician and hospital technical fees if denied claims are unrecognized. Vascular laboratories performing these tests need to review compliance with Medicare guidelines. Improvements may need to be made at both the provider and Medicare carrier levels in obtaining reimbursement for appropriately ordered noninvasive vascular diagnostic studies. (J Vasc Surg 2001;34:846-53.
Unruffled extensions and flatness over central subalgebras
A condition on an affine central subalgebra of a noetherian algebra
of finite Gelfand-Kirillov dimension, which we call here \emph{unruffledness},
is shown to be equivalent in some circumstances to the flatness of as a
-module. Unruffledness was studied by Borho and Joseph in work on enveloping
algebras of complex semisimple Lie algebras, and we discuss applications of our
result to enveloping algebras, as well as beginning the study of this condition
for more general algebras
Duplex Ultrasound Graft Limb Velocity Asymmetry Predicts Endoleak After Endovascular Aneurysm Repair
Simple algebras of Weyl type
Over a field of any characteristic, for a commutative associative algebra
with an identity element and for the polynomial algebra of a
commutative derivation subalgebra of , the associative and the Lie
algebras of Weyl type on the same vector space are
defined. It is proved that , as a Lie algebra (modular its center) or as
an associative algebra, is simple if and only if is -simple and
acts faithfully on . Thus a lot of simple algebras are obtained.Comment: 9 pages, Late
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