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The P-matrix problem is co-NP-complete
Mathematical Programming, 1994Recently Rohn and Poljak proved that for interval matrices with rank-one radius matrices testing singularity is NP-complete. This paper will show that given any matrix family belonging to the class of matrix polytopes with hypercube domains and rank-one perturbation matrices, a class which contains the interval matrices, testing singularity reduces to ...
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P matrix analysis of nucleon-nucleon scattering
Nuclear Physics A, 1984Abstract The P matrix is useful to establish the connection between the short range quark and gluon, and the long range nucleon and meson degrees of freedom which play a role in the interactions between hadrons. It can be used as a phenomenological tool in data parametrization but, more important, it contains information about the short range ...
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A generalised P-matrix model for SAW filters
IEEE Symposium on Ultrasonics, 2003, 2004The P-matrix model, which can be seen as a discrete version of the continuous COM model, is a well established tool to analyse the electro-acoustic properties of IDTs and reflector gratings. It relates both outgoing acoustic surface waves and the electric current to both incoming acoustic surface waves and the electric voltage.
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Computation of Error Bounds for P-matrix Linear Complementarity Problems
Mathematical Programming, 2005We give new error bounds for the linear complementarity problem where the involved matrix is a P-matrix. Computation of rigorous error bounds can be turned into a P-matrix linear interval system. Moreover, for the involved matrix being an H-matrix with positive diagonals, an error bound can be found by solving a linear system of equations, which is ...
Xiaojun Chen, Shuhuang Xiang
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P-matrix modeling of transverse-mode coupled resonator filters
1993 Proceedings IEEE Ultrasonics Symposium, 1993We develop an efficient analysis and synthesis tool for the design of transverse-mode coupled resonator filters. We describe the energy storage effect and the electrical and mechanical loading effect with a one-dimensional model. The two-dimensional nature of the problem is taken into account by shape functions, representing the nonuniform velocity ...
G. Scholl, Peter Russer, W. Ruile
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Coupled Channels and P-matrix approach to Baryon-Antibaryon Interactions
1987Recent data [1,2] taken at LEAR on the reaction \(\overline {p\,} \,p \to \,\overline A A\) show some interesting features. The differential cross-section is highly anisotropic even close to threshold, suggesting the contribution of many partial waves to the reaction.
Timmers, P. +3 more
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Off-shell two-particle scattering amplitude in the P-matrix approach
Theoretical and Mathematical Physics, 1988A generalization of the P-matrix approach which makes it possible to describe the interaction of two particles off the energy shell is proposed. Explicit separation in the wave function of a part corresponding to free motion yields a compact expression for the off-shell scattering amplitude and gives directly a method for separable expansion of the ...
N. M. Petrov, V. A. Babenko
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Extended p-matrix model to calculate imbalance characteristics of CRF filters
IEEE Ultrasonics Symposium, 2004, 2005An extended P-matrix model is introduced that includes additional electrical ports to take into account particular electrode polarities. The transduction efficiency and static capacitance of any particular electrode are calculated using the model of reflecting grating and electrostatic charge distribution in the total electrode structure.
Victor Plessky, Valery Grigorievsky
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Development of Fe-P Matrix Composites Containing Embedded Solid Lubricants
Materials Science Forum, 2014In this work the processing of composites containing graphite or hexagonal boron nitride dispersed in a ferrous matrix alloyed with phosphorous was addressed, with the goal of developing self-lubricating sintered materials with high mechanical resistance. Phosphorous is an alloy element characteristic in powder metallurgy for promoting the formation of
Cristiano Binder +3 more
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Study on a novel SAW sensor in TPMS based on the P-matrix model
2008 3rd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, 2008Tire pressure monitoring system (TPMS) is an electronic system monitoring the air pressure in a pneumatic tire at real time. The goal of this paper is to analyze and optimize the design of a novel wireless passive SAW sensor used in TPMS, via theoretical derivation and simulations.
Tie Liu, Hong Hu, Liang Zheng, T.-L. Li
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