Scalar Resonances
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. O efeito Casimir dinâmico e decoerência
In this thesis we first demonstrate that the inevitable action of the environment can be substantially weakened when considering appropriate nonstationary quantum systems. Beyond protecting quantum states against decoherence, an oscillating frequency can be engineered to make the system-reservoir coupling almost negligible. Differently from the program for e
Publicado em: 2008
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2. Ressonâncias escalares: relações dinâmicas entre processos de espalhamento e decaimento / Scalar resonances: dynamic relations between scattering and decay processes
A existência de um méson escalar-isoescalar leve, conhecido como ?, foi proposta pela primeira vez na década de 60. A partícula tinha então um papel importante na construção teórica das interações ?? mas, apesar dos esforços experimentais, ela não foi detectada nos anos que se seguiram. Essa situação foi radicalmente alterada em 2001, quando um
Publicado em: 2007
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3. ANÁLISE DE AMPLITUDES DO DECAIMENTO D+ KS(PI)-(PI)+(PI)+ NO EXPERIMENTO FOCUS / AMPLITUDE ANALYSIS OF THE DECAY D+ K (PI)-(PI)+(PI)+ IN FOCUS EXPERIMENT
This thesis is devoted to the study of the decay D+ KS(pi)− (pi)+(pi)+ with data collected from the FOCUS experiment, at Fermilab. The final state composed of 4 pseudo-scalars can be produced through a number of resonant sub-structures. The purpose of this analysis is to find the contributing intermediate states by measuring their relative strenghts an
Publicado em: 2007
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4. Hadronic physics in peripheral heavy Ion collisions
We discuss the production of hadronic resonances in very peripheral heavy ion collisions, where the ions collide with impact parameter larger than twice the nuclear radius and remain intact after the collision. We compare the resonance production through two-photon and double Pomeron exchange, showing that when we impose the condition for a peripheral intera
Brazilian Journal of Physics. Publicado em: 2002-12
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5. Nuclear magnetic dipole interactions in field-oriented proteins: information for structure determination in solution.
The measurement of dipolar contributions to the splitting of 15N resonances of 1H-15N amide pairs in multidimensional high-field NMR spectra of field-oriented cyanometmyoglobin is reported. The splittings appear as small field-dependent perturbations of normal scalar couplings. Assignment of more than 90 resonances to specific sequential sites in the protein
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6. A proton NMR study of a DNA dumb-bell structure with hairpin loops of only two nucleotides: d(CACGTGTGTGCGTGCA).
One- and two-dimensional nuclear magnetic resonance (NMR) experiments were used to study the conformation of the DNA hexadecanucleotide d(CACGTGTGTGCGTGCA) in aqueous solution. NMR spectra were recorded for the compound in D2O and in H2O/D2O (90/10) over the temperature range 1 degree C-60 degrees C. Assignments of imino proton resonances and of non-exchange
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7. A nicked duplex decamer DNA with a PEG6 tether
A dumbbell double-stranded DNA decamer tethered with a hexaethylene glycol linker moiety (DDSDPEG), with a nick in the centre of one strand, has been synthesised. The standard NMR methods, E.COSY, TOCSY, NOESY and HMQC, were used to measure 1H, 31P and T1 spectral parameters. Molecular modelling using rMD-simulated annealing was used to compute the str
Oxford University Press.
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8. Detection of N-H···N hydrogen bonding in RNA via scalar couplings in the absence of observable imino proton resonances
Hydrogen bond networks stabilize RNA secondary and tertiary structure and are thus essentially important for protein recognition. During structure refinements using either NMR or X-ray techniques, hydrogen bonds were usually inferred indirectly from the proximity of donor and acceptor functional groups. Recently, quantitative heteronuclear J(N,N)-HNN COSY NM
Oxford University Press.