Upper Bound Limit
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Determination of Forming Limit Diagrams Based on Ductile Damage Models and Necking Criteria
Abstract In this paper, forming limit diagrams (FLDs) for an aluminum alloy are predicted through numerical simulations using various localized necking criteria. A comparative study is conducted for the FLDs determined by using the Lemaitre damage approach and those obtained with the modified Gurson-Tvergaard-Needleman (GTN) damage model. To this end, both d
Lat. Am. j. solids struct.. Publicado em: 2017-10
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2. O Método do Averaging via Grau de Brouwer para determinar o número de ciclos limites de um centro 4-dimensional em sistemas de controle. / Bifurcation of Limit Cycles from a 4-dimensional Center in Control System
In this work, we studying the Averaging Method via Brouwer Degree for upper bound the number of limit cycle that can bifurcate from a center type singularity of a diferential equation system. After that, we give concrete examples this upper bound can be realized.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2010
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3. Comparação e descrição de parâmetros acústicos do canto de Volatinia jacarina (Aves: Emberizidae) no contexto de seleção sexual
Bird songs may convey information about the quality of the male, and females can access this information during partner choice. The aim of this study was to test for correlations between acoustic parameters of songs from Volatinia jacarina males and their physical attributes. First we determined, through quantitative analysis, the degree of stereotypy in the
Publicado em: 2009
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4. The process mu -> nue e$\bar{\nu}$mu in the 2HDM with flavor changing neutral currents
We consider the process m -> nue e$\bar{\nu}$mu in the framework of a two Higgs doublet model with flavor changing neutral currents (FCNC). Since FCNC generates in turn flavor changing charged currents in the lepton sector, this process appears at tree level mediated by a charged Higgs boson exchange. From the experimental upper limit for this decay, we obta
Brazilian Journal of Physics. Publicado em: 2003-12
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5. The 2D ion D- in the presence of a magnetic fied using adiabatic method hyperspherical / O íon D- bidimensional na presença de um campo magnético pelo método adiabático hiperesférico
The adiabatic hyperspherical approach (HAA) is used to determine the energies and wave functions of the bound states of a negatively charged ion (D-), in the presence of a magnetic field, in semiconductors. Experimentally, the bound energy of this system is measured with the ion confined in quantum wells, or either, the system is quasi-two dimensional, but,
Publicado em: 2002
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6. Upper-limit mutation rate estimation for a plant RNA virus
It is generally accepted that mutation rates of RNA viruses are inherently high due to the lack of proofreading mechanisms. However, direct estimates of mutation rate are surprisingly scarce, in particular for plant viruses. Here, based on the analysis of in vivo mutation frequencies in tobacco etch virus, we calculate an upper-bound mutation rate estimation
The Royal Society.
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7. Association of Many Regions of the Bacillus subtilis Chromosome with the Cell Membrane
Unsheared lysates of Bacillus subtilis 168T− containing uniformly labeled deoxyribonucleic acid (DNA) were exposed to varying doses of gamma rays to introduce double-strand scissions in the chromosome. From an estimate of the number-average molecular weight and the amount of DNA bound to membrane after irradiation, about 70 to 90 regions of the bacterial c
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8. The Alkali Ion-DNA Interaction as Reflected in the Nuclear Relaxation Rates of 23Na and 87Rb
Longitudinal relaxation rates of 23Na and 87Rb in aqueous solutions of DNA were measured and interpreted in terms of contributions of “bound” and free species. The frequency dependence of the 23Na relaxation rate sets an upper limit of 5.5 nsec for the correlation time characteristic of the alkali ion-DNA interaction. The plausible description of the alk
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9. Statistical design considerations for pilot studies transitioning therapies from the bench to the bedside
Pilot studies are often used to transition therapies developed using animal models to a clinical setting. Frequently, the focus of such trials is on estimating the safety in terms of the occurrence of certain adverse events. With relatively small sample sizes, the probability of observing even relatively common events is low; however, inference on the true u
BioMed Central.
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10. In vivo DNA loops in araCBAD: size limits and helical repeat.
Formation of a DNA loop by AraC proteins bound at the araI and araO2 sites, whose center-to-center distance is 211 base pairs, is necessary for repression of the araBAD promoter, PBAD, of Escherichia coli. To determine the upper and lower size limits of the loop, we constructed PBAD-reporter gene fusion plasmids with various spacings between araI and araO2 a
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11. Absence of ligands bound to glycoprotein IIB-IIIA on the exposed surface of a thrombus may limit thrombus growth in flowing blood.
We examined the distribution of glycoprotein IIb-IIIa (GPIIb-IIIa) and its ligands fibrinogen and von Willebrand factor (vWf) on platelets which had adhered under flow conditions. Immunoelectron microscopy was performed on whole mounts and frozen thin sections of adhering platelets. GPIIb-IIIa was homogeneously distributed on dendritic platelets and on inter
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12. Simulation of the diffusional association of barnase and barstar.
The rate of protein association places an upper limit on the response time due to protein interactions, which, under certain circumstances, can be diffusion-controlled. Simulations of model proteins show that diffusion-limited association rates are approximately 10(6)-10(7) M-1 s-1 in the absence of long-range forces (Northrup, S. H., and H. P. Erickson. 199