4,045 research outputs found
Studies of hepatic synthesis in vivo of plasma proteins, including orosomucoid, transferrin, α-antitrypsin, C8, and factor B
Serum protein types were determined in eight recipients and donors in cases of hepatic homotransplantation. A change from recipient type to donor type was observed for factor B, C8, orosomucoid, haptoglobin, transferrin, α1-antitrypsin, C3 and C6, but not for Gm and Inv immunoglobulin markers. The results indicate that all the proteins studied (except immunoglobulins) are produced primarily by the liver in vivo. © 1980
An Alternative Perspective on Copositive and Convex Relaxations of Nonconvex Quadratic Programs
We study convex relaxations of nonconvex quadratic programs. We identify a
family of so-called feasibility preserving convex relaxations, which includes
the well-known copositive and doubly nonnegative relaxations, with the property
that the convex relaxation is feasible if and only if the nonconvex quadratic
program is feasible. We observe that each convex relaxation in this family
implicitly induces a convex underestimator of the objective function on the
feasible region of the quadratic program. This alternative perspective on
convex relaxations enables us to establish several useful properties of the
corresponding convex underestimators. In particular, if the recession cone of
the feasible region of the quadratic program does not contain any directions of
negative curvature, we show that the convex underestimator arising from the
copositive relaxation is precisely the convex envelope of the objective
function of the quadratic program, providing another proof of Burer's
well-known result on the exactness of the copositive relaxation. We also
present an algorithmic recipe for constructing instances of quadratic programs
with a finite optimal value but an unbounded doubly nonnegative relaxation.Comment: 26 page
OGO-E space vehicle response to transient loading at Atlas booster engine cutoff
Computer program for OGO-E vehicle response analysis to transient loading during Atlas booster burnou
Liquid metal magnetohydrodynamics (LMMHD) technology transfer feasibility study. Volume 2: Appendixes
For abstract, see N74-13466
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