7,061 research outputs found
Design of pulse jet coolant delivery system for minimal quantity lubricant (IP MQL) operation
Minimum quantity lubrication (MQL) machining is one of the promising solutions to
the requirement for reducing cutting fluid consumption. The work here describes MQL
machining in a range of lubricant consumption of 2.0-2.355ml/s, which is between 10–
100 times lesser than the consumption usually adopted in industries. MQL machining in
this range is called pulse jet coolant delivery system. A specially designed system, the
IP MQL, was used for concentrating small amounts of lubricant onto the cutting
interface. The performance of concentrated spraying of lubricant in pulse jet coolant
delivery system design was simulated and compared with that of current ‘Pulse Jet
MQL’ systems. The concentrated spraying of lubricant with a specially designed system
was found to be effective in increasing tool life in the pulse jet coolant delivery system
range
Minimum quality levels and import tariffs
In a vertically differentiated duopoly the use of import tariffs by an importing country decreases domestic welfare if import tariffs are chosen once the firms have made their quality decisions. In this paper we propose import tariffs that are contingent on some minimum quality level (MQL) being met. A firm is taxed if it fails to meet these MQL. Import tariffs conditional on fulfilling the MQL are welfare improving over free trade. Investment in quality increases, market coverage goes up and consumer surplus increases. Firm profits decrease relative to free trade under such tariffs
MINIMUM QUALITY LEVELS AND IMPORT TARIFFS
In a vertically differentiated duopoly the use of import tariffs by an importing country decreases domestic welfare if import tariffs are chosen once the firms have made their quality decisions. In this paper we propose import tariffs that are contingent on some minimum quality level (MQL) being met. A firm is taxed if it fails to meet these MQL. Import tariffs conditional on fulfilling the MQL are welfare improving over free trade. Investment in quality increases, market coverage goes up and consumer surplus increases. Firm profits decrease relative to free trade under such tariffs.
Black holes from multiplets of scalar fields in 2+1- and 3+1-dimensions
We obtain classes of black hole solutions constructed from multiplets of
scalar fields in 2+1 / 3+1 dimensions. The multi-component scalars don't
undergo a symmetry breaking so that only the isotropic modulus is effective.
The Lagrangian is supplemented by a self-interacting potential which plays
significant role in obtaining the exact solutions. In 2+1 / 3+1 dimensions
doublet / triplet of scalars is effective which enriches the available black
hole spacetimes and creates useful Liouville weighted field theoretic models.Comment: 10 pages, 10 figures, final version accepted for publication in EPJ
Supersymmetric particle mass measurement with invariant mass correlations
The kinematic end-point technique for measuring the masses of supersymmetric
particles in R-Parity conserving models at hadron colliders is re-examined with
a focus on exploiting additional constraints arising from correlations in
invariant mass observables. The use of such correlations is shown to
potentially resolve the ambiguity in the interpretation of quark+lepton
end-points and enable discrimination between sequential two-body and three-body
lepton-producing decays. The use of these techniques is shown to improve the
SUSY particle mass measurement precision for the SPS1a benchmark model by at
least 20-30% compared to the conventional end-point technique.Comment: 29 pages, 23 .eps figures, JHEP3 style; v2 adds some references and
small clarifications to text; v3 adds some more clarifications to the tex
Multidimensional Quadrilateral Lattices are Integrable
The notion of multidimensional quadrilateral lattice is introduced. It is
shown that such a lattice is characterized by a system of integrable discrete
nonlinear equations. Different useful formulations of the system are given. The
geometric construction of the lattice is also discussed and, in particular, it
is clarified the number of initial--boundary data which define the lattice
uniquely.Comment: 18 pages, LaTeX, 6 Postscript figure
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