1,934 research outputs found
All-electrical detection of the relative strength of Rashba and Dresselhaus spin-orbit interaction in quantum wires
We propose a method to determine the relative strength of Rashba and
Dresselhaus spin-orbit interaction from transport measurements without the need
of fitting parameters. To this end, we make use of the conductance anisotropy
in narrow quantum wires with respect to the directions of an in-plane magnetic
field, the quantum wire and the crystal orientation. We support our proposal by
numerical calculations of the conductance of quantum wires based on the
Landauer formalism which show the applicability of the method to a wide range
of parameters.Comment: 4 pages, 4 figure
Fêmeas cruzadas ou F1 recomendadas para a produção de suínos para o abate.
bitstream/item/58663/1/CUsersPiazzonDocuments184.pd
High-energy two-electron capture with emission of a single photon
We investigate the two-electron capture with emission of a single photon to the ground state in the Coulomb field of a heavy nucleus in its collision with a light atom. Describing electron-electron interactions in the bound state perturbatively, we obtained an analytical formula for the high-energy limit of the cross section. In combination with previous results obtained in the same approach we calculated the cross section in a broad interval of energies of the collision. We show that the amplitude of the process at high energy depends on the behavior of the bound state wave function near the triple coalescence point. We analyze the properties of the approximate wave functions which are necessary for the description of the high-energy limit
Quasifission and fusion-fission in massive nuclei reactions. Comparison of reactions leading to the Z=120 element
The yields of evaporation residues, fusion-fission and quasifission fragments
in the Ca+Sm and O+W reactions are analyzed
in the framework of the combined theoretical method based on the dinuclear
system concept and advanced statistical model. The measured yields of
evaporation residues for the Ca+Sm reaction can be well
reproduced. The measured yields of fission fragments are decomposed into
contributions coming from fusion-fission, quasifission, and fast-fission. The
decrease in the measured yield of quasifission fragments in
Ca+Sm at the large collision energies and the lack of
quasifission fragments in the Ca+Sm reaction are explained by
the overlap in mass-angle distributions of the quasifission and fusion-fission
fragments. The investigation of the optimal conditions for the synthesis of the
new element =120 (=302) show that the Cr+Cm reaction is
preferable in comparison with the Fe+Pu and Ni+U
reactions because the excitation function of the evaporation residues of the
former reaction is some orders of magnitude larger than that for the last two
reactions.Comment: 27 pages, 12 figures, submitted to Phys. Rev.
Analise citogenetica de suínos intersexuados.
Esclarecer a etiologia da interssexualidade devido aos fatores geneticos, foram observados os produtos de 350 fêmeas em um plantel suíno, nascidos num período de 11 meses
Aumento do peso e redução da idade a puberdade de leitoas através dos cruzamentos.
bitstream/item/58795/1/CUsersPiazzonDocuments151.pd
Resultados comparativos da inseminação artificial em suínos com sêmen congelado e resfriado.
bitstream/item/59096/1/CUsersPiazzonDocuments100.pd
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