2,243 research outputs found
Categorical Aspects of the Double Structure of a Module
In this work we develop some categorical aspects of the double structure of a
module
Real and complex integral closure, Lipschitz equisingularity and applications on square matrices
Recently the authors investigated the Lipschitz triviality of simple germs of
matrices. In this work, we improve some previous results and we present an
extension of an integral closure result for the real setting. These tools are
applied to investigate classes of square matrices singularities classified by
Bruce and Tari
Linear decomposition of approximate multi-controlled single qubit gates
We provide a method for compiling approximate multi-controlled single qubit
gates into quantum circuits without ancilla qubits. The total number of
elementary gates to decompose an n-qubit multi-controlled gate is proportional
to 32n, and the previous best approximate approach without auxiliary qubits
requires 32nk elementary operations, where k is a function that depends on the
error threshold. The proposed decomposition depends on an optimization
technique that minimizes the CNOT gate count for multi-target and
multi-controlled CNOT and SU(2) gates. Computational experiments show the
reduction in the number of CNOT gates to apply multi-controlled U(2) gates. As
multi-controlled single-qubit gates serve as fundamental components of quantum
algorithms, the proposed decomposition offers a comprehensive solution that can
significantly decrease the count of elementary operations employed in quantum
computing applications
Hemispheric asymmetry in the sunspot cycle as a nonextensive phenomenon
The appearance of dark sunspots over the solar photosphere is not considered
to be symmetric between the northern and southern hemispheres. Among the
different conclusions obtained by several authors, we can point out that the
North-South asymmetry is a real and systematic phenomenon and is not due to
random variability. In the present work, we selected the sunspot area data of a
sample of 13 solar cycles divided by hemisphere extracted from the Marshall
Space Flight Centre (MSFC) database to investigate the behavior of probability
distributions using an out-of-equilibrium statistical model a.k.a non-extensive
statistical mechanics. Based on this statistical framework, we obtained that
the non-extensive entropic parameter has a semi-sinusoidal variation with a
period of 22 year (Hale cycle). Among the most important results, we can
highlight that the asymmetry index revealed the dominance of the
northern hemisphere against the southern one. Thus, we concluded that the
parameter can be considered an effective measure for diagnosing
long-term variations of the solar dynamo. Finally, our study opens a new
approach to investigating solar variability from the nonextensive perspective.Comment: 17 pages, 2 tables and 5 figures. Submitted to Solar Physic
O uso da ponta de cana na engorda de novilhos em confinamento.
bitstream/item/138481/1/COT-09.pdfCNPGC
Avaliação econômica da engorda de novilhos confinados com subprodutos da microdestilaria de álcool.
Desempenho dos animais. Avaliação econômica.bitstream/item/104806/1/Avaliacao-economica-da-engorda.pd
Nota sobre métodos de colheita do sorgo sacarino para produção de álcool.
Sorgo sacarino cv. BR 501 foi colhido com e sem folhas para produção de caldo. Devido ao maior custo envolvido com a mão-de-obra, a retirada das folhas mostrou-se anti-econômica. Pesquisas para reduzir estes custos poderiam ser bastante benéficas.bitstream/item/132260/1/BP01.pd
Toward Improving Ambient Volta Potential Measurements with SKPFM for Corrosion Studies
Scanning Kelvin probe force microscopy (SKPFM) is used in corrosion studies to quantify the relative nobility of different microstructural features present within complex metallic systems and thereby elucidate possible corrosion initiation sites. However, Volta potential differences (VPDs) measured via SKPFM in the literature for metal alloys exhibit large variability, making interpretation and application for corrosion studies difficult. We have developed an improved method for referencing SKPFM VPDs by quantifying the closely related work function of the probe relative to an inert gold standard whose modified work function is calculated via density functional theory (DFT). By measuring and tracking changes in the probe vs. gold VPD, this method compensates for some of the complex effects that cause changes in an individual probe\u27s work function. Furthermore, it provides a path toward direct, quantitative comparison of SKPFM results obtained by different researchers. Application of this method to a Cu-Ag-Ti eutectic braze of a steel sample imaged with multiple SKPFM probes of differing compositions led to enhanced repeatability both within and among probe types, as well as enabled the calculation of modified work function values for each of the microstructural constituents present
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