Results 211 to 220 of about 76,640 (249)
Some of the next articles are maybe not open access.
Bulletin of the Iranian Mathematical Society, 2020
For a module \(M\), consider the following conditions: \((D_{2})\) If \(N\leq M\) such that \(\frac{M}{N}\) is isomorphic to a direct summand of \(M\), then \(N\) is a direct summand of \(M\); \((D_{3})\) If \(N\) and \(K\) are direct summands of \(M\) such that \( M=N+K\), then \(N\cap K\) is a direct summand of \(M\); \((P^{\ast })\) For every ...
Burcu Nişancı Türkmen +2 more
openaire +2 more sources
For a module \(M\), consider the following conditions: \((D_{2})\) If \(N\leq M\) such that \(\frac{M}{N}\) is isomorphic to a direct summand of \(M\), then \(N\) is a direct summand of \(M\); \((D_{3})\) If \(N\) and \(K\) are direct summands of \(M\) such that \( M=N+K\), then \(N\cap K\) is a direct summand of \(M\); \((P^{\ast })\) For every ...
Burcu Nişancı Türkmen +2 more
openaire +2 more sources
Communications in Algebra, 2007
We call supplemented self-projective modules “strongly discrete modules.” We characterize discrete and strongly discrete modules in terms of lifting of maps and prove some of their properties. We show that epi-projective lifting modules are precisely the strongly discrete modules and dually mono-injective extending modules are precisely the self ...
Lalitha Ganesan, N. Vanaja
openaire +1 more source
We call supplemented self-projective modules “strongly discrete modules.” We characterize discrete and strongly discrete modules in terms of lifting of maps and prove some of their properties. We show that epi-projective lifting modules are precisely the strongly discrete modules and dually mono-injective extending modules are precisely the self ...
Lalitha Ganesan, N. Vanaja
openaire +1 more source
Discrete modulation for interference mitigation
2017 IEEE International Symposium on Information Theory (ISIT), 2017This paper analyzes the performance of discrete input distributions (coded modulation) in interference channels. This approach is motivated in part by the necessity of using coded modulation in practical systems, and in part by the potential of discrete distributions for interference alignment as well as the importance demonstrated by Dytso et al. of
Mirza Uzair Baig +2 more
openaire +1 more source
Modulational instabilities in discrete lattices
Physical Review A, 1992We study analytically and numerically modulational instabilities in discrete nonlinear chains, taking the discrete Klein-Gordon model as an example. We show that discreteness can drastically change the conditions for modulational instability; e.g., at small wave numbers a nonlinear carrier wave is unstable to all possible modulations of its amplitude ...
, Kivshar, , Peyrard
openaire +2 more sources
Experimental Observation of Discrete Modulational Instability
Physical Review Letters, 2004We report the first experimental observation of modulation instability in a discrete optical nonlinear array.
J, Meier +8 more
openaire +3 more sources
DISCRETE AND QUASI-DISCRETE MODULES
Communications in Algebra, 2002ABSTRACT We show that discrete and quasi-discrete modules can be characterized in terms of the lifting of homomorphisms from to , for certain submodules of . We prove that is quasi-discrete iff is amply supplemented and satisfies for every positive integer and; is discrete iff is lifting and satisfies for every positive integer .
openaire +1 more source
Discrete Bandpass Modulation Methods
2021Abstract This chapter presents mathematical models of discrete baseband and bandpass communication systems based on binary phase-shift keying, quaternary phase-shift keying, frequency-shift keying, and quadrature amplitude modulation. The operation of intermediate-frequency systems where all processing is performed in the discrete-time ...
openaire +1 more source
Discrete electroabsorption modulators with enhanced modulation depth
Journal of Lightwave Technology, 1996In this paper, we present an investigation into factors that limited the median modulation depth of a batch of packaged discrete waveguide EA modulators to 23 dB at a wavelength of 1.55 /spl mu/m. Results from detailed measurements of the DC absorption and photocurrent spectra are used to show how stray parasitic light can perturb the absorption ...
D.G. Moodie +5 more
openaire +1 more source