7,415 research outputs found
Unnecessary Indeterminacy: Process Patent Protection After Kinik v. ITC
In Kinik v. International Trade Commission, the U.S. Court of Appeals for the Federal Circuit suggested in dicta that the defenses available to foreign manufacturers in infringement actions under 35 U.S.C. § 271(g) in Federal district courts do not apply to exclusion actions before the International Trade Commission. This iBrief argues that this decision is problematic for three reasons: (1) the Federal Circuit’s decision is inconsistent with the ITC’s longstanding tradition of consulting the patent statute when adjudicating exclusion actions under 19 U.S.C. § 1337, (2) the court’s suggestion that the ITC should be given broad discretion to resolve conflicts between the patent statute and the Tariff Act is at odds with the Chevron doctrine, and (3) if the ITC employs the broad discretion that Kinik confers to it by excluding more foreign art than Federal district courts could lawfully exclude under the patent statute, the enforcement of domestic patent policy in the United States could conceivably violate obligations of non-discrimination (Article 27.1) and burden-shifting (Article 34) imposed by the TRIPS Agreement
Effects of different closures for thickness diffusivity
The effects of spatial variations of the thickness diffusivity (K) appropriate to the parameterisation of [Gent, P.R. and McWilliams, J.C., 1990. Isopycnal mixing in ocean circulation models. J. Phys. Oceanogr., 20, 150–155.] are assessed in a coarse resolution global ocean general circulation model. Simulations using three closures yielding different lateral and/or vertical variations in K are compared with a simulation using a constant value. Although the effects of changing K are in general small and all simulations remain biased compared to observations, we find systematic local sensitivities of the simulated circulation on K. In particular, increasing K near the surface in the tropical ocean lifts the depth of the equatorial thermocline, the strength of the Antarctic Circumpolar Current decreases while the subpolar and subtropical gyre transports in the North Atlantic increase by increasing K locally. We also find that the lateral and vertical structure of K given by a recently proposed closure reduces the negative temperature biases in the western North Atlantic by adjusting the pathways of the Gulf Stream and the North Atlantic Current to a more realistic position
Superconformal Ward Identities and their Solution
Superconformal Ward identities are derived for the the four point functions
of chiral primary BPS operators for superconformal symmetry in four
dimensions. Manipulations of arbitrary tensorial fields are simplified by
introducing a null vector so that the four point functions depend on two
internal -symmetry invariants as well as two conformal invariants. The
solutions of these identities are interpreted in terms of the operator product
expansion and are shown to accommodate long supermultiplets with free scale
dimensions and also short and semi-short multiplets with protected dimensions.
The decomposition into -symmetry representations is achieved by an expansion
in terms of two variable harmonic polynomials which can be expressed also in
terms of Legendre polynomials. Crossing symmetry conditions on the four point
functions are also discussed.Comment: 73 pages, plain Tex, uses harvmac, version 2, extra reference
Nuclear G-Matrix Elements from Nonlocal Potentials
We study effects of nonlocality in the nuclear force on the G-matrix elements
for finite nuclei. Nuclear G-matrix elements for \O16 are calculated in the
harmonic oscillator basis from a nonlocal potential which models quark exchange
effects between two nucleons. We employ a simple form of potential that gives
the same phase shifts as a realistic local nucleon potential. The G-matrix
elements calculated from the nonlocal potential show moderate increase in
repulsion from those derived from the local potential.Comment: 11 page, LaTeX, 2 PS figures, uses epsf.st
Nonlinear field theories during homogeneous spatial dilation
The effect of a uniform dilation of space on stochastically driven nonlinear
field theories is examined. This theoretical question serves as a model problem
for examining the properties of nonlinear field theories embedded in expanding
Euclidean Friedmann-Lema\^{\i}tre-Robertson-Walker metrics in the context of
cosmology, as well as different systems in the disciplines of statistical
mechanics and condensed matter physics. Field theories are characterized by the
speed at which they propagate correlations within themselves. We show that for
linear field theories correlations stop propagating if and only if the speed at
which the space dilates is higher than the speed at which correlations
propagate. The situation is in general different for nonlinear field theories.
In this case correlations might stop propagating even if the velocity at which
space dilates is lower than the velocity at which correlations propagate. In
particular, these results imply that it is not possible to characterize the
dynamics of a nonlinear field theory during homogeneous spatial dilation {\it a
priori}. We illustrate our findings with the nonlinear Kardar-Parisi-Zhang
equation
New Recursion Relations and a Flat Space Limit for AdS/CFT Correlators
We consider correlation functions of the stress-tensor or a conserved current
in AdS_{d+1}/CFT_d computed using the Hilbert or the Yang-Mills action in the
bulk. We introduce new recursion relations to compute these correlators at tree
level. These relations have an advantage over the BCFW-like relations described
in arXiv:1102.4724 and arXiv:1011.0780 because they can be used in all
dimensions including d=3. We also introduce a new method of extracting
flat-space S-matrix elements from AdS/CFT correlators in momentum space. We
show that the (d+1)-dimensional flat-space amplitude of gravitons or gluons can
be obtained as the coefficient of a particular singularity of the d-dimensional
correlator of the stress-tensor or a conserved current; this technique is valid
even at loop-level in the bulk. Finally, we show that our recursion relations
automatically generate correlators that are consistent with this observation:
they have the expected singularity and the flat-space gluon or graviton
amplitude appears as its coefficient.Comment: 22+6 pages (v2) typos fixe
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