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79 papers · 1 filter
Totally real immersions of surfaces
Andrzej Derdzinski, Tadeusz Januszkiewicz
Totally real immersions of a closed real surface in an almost complex surface are completely classified, up to homotopy through totally real immersions, by suitably def…
Lithographic engineering of anisotropies in (Ga,Mn)As
S. Hümpfner, M. Sawicki, K. Pappert +6
The focus of studies on ferromagnetic semiconductors is moving from material issues to device functionalities based on novel phenomena often associated with the anisotropy properti…
Magnetic studies of GaN nanoceramics
A. J. Zaleski, M. Nyk, W. Strek
The synthesis, morphology and magnetization measurements of GaN nanoceramics obtained under high pressure are reported. In particular the effect of grain size on magnetic propertie…
Paramagnetic GaN:Fe and ferromagnetic (Ga,Fe)N - relation between structural, electronic, and magnetic properties
A. Bonanni, M. Kiecana, C. Simbrunner +8
We report on the metalorganic chemical vapor deposition (MOCVD) of GaN:Fe and (Ga,Fe)N layers on c-sapphire substrates and their thorough characterization via high-resolution x-ray…
Lightweight security mechanism for PSTN-VoIP cooperation
Wojciech Mazurczyk, Zbigniew Kotulski
In this paper we describe a new, lightweight security mechanism for PSTN-VoIP cooperation that is based on two information hiding techniques: digital watermarking and steganography…
Hopf Algebra Structure of a Model Quantum Field Theory
A. I. Solomon, G. E. H. Duchamp, P. Blasiak +2
Recent elegant work on the structure of Perturbative Quantum Field Theory (PQFT) has revealed an astonishing interplay between analysis(Riemann Zeta functions), topology (Knot theo…