4,004 research outputs found
Experimental Study of Electrophoretic Deposited Carbon Nanotubes on Microstrip Transmission Line Resonators and Filters
The electrical properties of single-walled carbon nanotube electrophoreses deposition on different types of gold-plated microstrip devices are investigated. Simple transmission lines, transmission line resonators and filters were subjected to deposition of functionalized tubes in an aqueous solution. It is found that the process lowers the resonant frequency of the resonators and filters compared to the untreated devices, at the cost of increased insertion loss and reduced resonator Q-factor
Ultrafast QND measurements based on diamond-shape artificial atom
We propose a Quantum Non Demolition (QND) read-out scheme for a
superconducting artificial atom coupled to a resonator in a circuit QED
architecture, for which we estimate a very high measurement fidelity without
Purcell effect limitations. The device consists of two transmons coupled by a
large inductance, giving rise to a diamond-shape artificial atom with a logical
qubit and an ancilla qubit interacting through a cross-Kerr like term. The
ancilla is strongly coupled to a transmission line resonator. Depending on the
qubit state, the ancilla is resonantly or dispersively coupled to the
resonator, leading to a large contrast in the transmitted microwave signal
amplitude. This original method can be implemented with state of the art
Josephson parametric amplifier, leading to QND measurements in a few tens of
nanoseconds with fidelity as large as 99.9 %.Comment: 5 pages, 4 figure
Helicoidal Fields and Spin Polarized Currents in CNT-DNA Hybrids
We report on theoretical studies of electronic transport in the archetypical
molecular hybrid formed by DNA wrapped around single-walled carbon nanotubes
(CNTs). Using a Green's function formalism in a -orbital tight-binding
representation, we investigate the role that spin-orbit interactions play on
the CNT in the case of the helicoidal electric field induced by the polar
nature of the adsorbed DNA molecule. We find that spin polarization of the
current can take place in the absence of magnetic fields, depending strongly on
the direction of the wrapping and length of the helicoidal field. These
findings open new routes for using CNTs in spintronic devices.Comment: 4 pages, 5 figure
Graded identities of block-triangular matrices
Let be an infinite field and be the algebra of upper
block-triangular matrices over . In this paper we describe a basis for the
-graded polynomial identities of , with an elementary
grading induced by an -tuple of elements of a group such that the
neutral component corresponds to the diagonal of . In
particular, we prove that the monomial identities of such algebra follow from
the ones of degree up to . Our results generalize for infinite fields of
arbitrary characteristic, previous results in the literature which were
obtained for fields of characteristic zero and for particular -gradings. In
the characteristic zero case we also generalize results for the algebra
with a tensor product grading, where is a
color commutative algebra generating the variety of all color commutative
algebras.Comment: 24 pages and 39 references. We have added section 5 in the text about
tensor products by color commutative superalgebra
Embrapa Recursos Genéticos e Biotecnologia presente no Show Rural 2007.
bitstream/CENARGEN/30149/1/bpecuario010207.pdfPublicado em 05/02/2007. Disponível em: Boletim Pecuário, bpecuario010207; Agrosoft, agrosoft020207; Pets, pets040207; Portal Agronegócio, pagronegocio050207; Hotel Virtual, hvirtual020207; Agroagenda, agroagenda060207; Clicnews, clicnews040207; Ruralnet, ruralnet090207a
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