23,844 research outputs found
Simple torsion test for shear moduli determination of orthotropic composites
By means of torsion tests performed on test specimens of the same material having a minimum of two different cross sections (flat sheet of different widths), the effective in-plane (G13) and out-of-plane (G23) shear moduli were determined for two composite materials of uniaxial and angleply fiber orientations. Test specimens were 16 plies (nominal 2 mm) thick, 100 mm in length, and in widths of 6.3, 9.5, 12.5, and 15.8 mm. Torsion tests were run under controlled deflection (constant angle of twist) using an electrohydraulic servocontrolled test system. In-plane and out-of-plane shear moduli were calculated from an equation derived in the theory of elasticity which relates applied torque, the torsional angle of twist, the specimen width/thickness ratio, and the ratio of the two shear moduli G13/G23. Results demonstrate that torsional shear moduli, G23 as well as G13, can be determined by simple torsion tests of flat specimens of rectangular cross section. Neither the uniaxial nor angleply composite material were transversely isotropic
Principal-Agent Problem with Minimum Performance Insurance
A minimum performance insurance in the Principal-Agent problem is wealth reducing to the principal. This result points to further inefficiencies in mandatory individual Pension Funds' contracts, particularly the one established in the 1993's 100th Law in Colombia.Incentives, Agency Theory, Pensions. Classification JEL: D86; D82; G23.
The dependence of strange hadron multiplicities on the speed of hadronization
Hadron multiplicities are calculated in the ALCOR model for the Pb+Pb
collisions at CERN SPS energy. Considering the newest experimental results, we
display our prediction obtained from the ALCOR model for stable hadrons
including strange baryons and anti-baryons.Comment: 8 pages, LaTeX in IOP style, appeared in the Proceedings of
Strangeness'97 Conference, Santorini, April 14-18 1997, J. of Physics G23
(1997) 194
Infrared Fixed Point Structure in Minimal Supersymmetric Standard Model with Baryon and Lepton Number Violation
We study in detail the renomalization group evolution of Yukawa couplings and
soft supersymmetry breaking trilinear couplings in the minimal supersymmetric
standard model with baryon and lepton number violation. We obtain the exact
solutions of these equations in a closed form, and then depict the infrared
fixed point structure of the third generation Yukawa couplings and the highest
generation baryon and lepton number violating couplings. Approximate analytical
solutions for these Yukawa couplings and baryon and lepton number violating
couplings, and the soft supersymmetry breaking couplings are obtained in terms
of their initial values at the unification scale. We then numerically study the
infrared fixed surfaces of the model, and illustrate the approach to the fixed
points.Comment: 16 pages REVTeX, figures embedded as epsfigs, replaced with version
to appear in Physical Review D, minor typographical errors eliminated and
references reordered, figures correcte
Novikov algebras and a classification of multicomponent Camassa-Holm equations
A class of multi-component integrable systems associated to Novikov algebras,
which interpolate between KdV and Camassa-Holm type equations, is obtained. The
construction is based on the classification of low-dimensional Novikov algebras
by Bai and Meng. These multi-component bi-Hamiltonian systems obtained by this
construction may be interpreted as Euler equations on the centrally extended
Lie algebras associated to the Novikov algebras. The related bilinear forms
generating cocycles of first, second and third order are classified. Several
examples, including known integrable equations, are presented.Comment: V2: some comments and references are adde
Periodicity and Growth in a Lattice Gas with Dynamical Geometry
We study a one-dimensional lattice gas "dynamical geometry model" in which
local reversible interactions of counter-rotating groups of particles on a ring
can create or destroy lattice sites. We exhibit many periodic orbits and and
show that all other solutions have asymptotically growing lattice length in
both directions of time. We explain why the length grows as in all
cases examined. We completely solve the dynamics for small numbers of particles
with arbitrary initial conditions.Comment: 18 pages, LaTe
Janossy Densities of Coupled Random Matrices
We explicitly calculate Janossy densities for a special class of finite
determinantal point processes with several types of particles introduced by
Pr\"ahofer and Spohn and, in the full generality, by Johansson in connection
with the analysis of polynuclear growth models. The results of our paper
generalize the theorem we proved earlier with Borodin about the Janossy
densities in biorthogonal ensembles. In particular, our results can be applied
to coupled random matrices.Comment: We revised the introduction and added a couple of new reference
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