Arjan Doff

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Communication at mmWave frequencies has been the focus in the recent years. In this paper, we discuss standardization efforts in 60 GHz short range communication and the progress therein. We compare the available standards in terms of network architecture, medium access control mechanisms, physical layer techniques and several other features. Comparative(More)
One hundred and thirty-four bovine embryos were collected from 17 superovulated Hereford cows and processed for metaphase chromosome spreads. Mitotic figures were obtained from 54 embryos (40%), but only 34 embryos (25%) provided analyzable chromosomes spreads. Thirty embryos were 2n = 60, one was a possible 2n/4n mosaic and three were hypodiploid. The(More)
Alex G. Dias, A. Doff, C. A. de S. Pires, P. S. Rodrigues da Silva Instituto de F́ısica, Universidade de São Paulo, Caixa Postal 66.318, 05315-970,São Paulo-SP, Brazil Instituto de F́ısica Teórica, Universidade Estadual Paulista, Rua Pamplona 145, 01405-900 São Paulo SP, Brazil Departamento de F́ısica, Universidade Federal da Paráıba, Caixa Postal 5008,(More)
The uniqueness of the hypercharge assignments in the three fermion families leptoquark-bilepton SU(3)C×SU(4)L×U(1)N model is established. Although the gauge group contains an explicit U(1) factor, freedom from triangle anomalies combined with the requirement of nonvanishing charged fermion masses uniquely fix the electric charges of all fermions(More)
The mechanism that breaks the electroweak gauge symmetry, SU(2)L × U(1)Y , down to the gauge symmetry of electromagnetism U(1)em is the only still obscure part of the standard model. It is known that up to the scale of 1 TeV some sign of this mechanism has to become manifest in future experiments. In the same way that an upper bound on the scale of the(More)
Following the pioneering Okubo scrutiny of gauge simple groups for the quantum chromodynamics we show the constraints coming from the wondrous predictive leptoquark-bilepton flavordynamics connecting the number of color charges to solution of the flavor question and to an electric charge quantization unconstrained from the Dirac, Majorana or Dirac–Majorana(More)
We show the specific unusual features on chiral gauge anomalies cancellation in the minimal, necessarily 3-3-1, and the largest 3-4-1 weak isospin chiral gauge semisimple group leptoquark–bilepton extensions of the 3-2-1 conventional standard model of nuclear and electromagnetic interactions. In such models a natural explanation for the fundamental question(More)
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