A IMAGEM EM MOVIMENTO E O ESPAÇO-TEMPO: BILL VIOLA EM MEDITAÇÕES

Esta dissertação engloba, na dimensão interna, filosófica e emocional, as relações entre o espaço e o tempo ou como pontuado muitas vezes, o espaçotempo como elementos constitutivos de trabalhos de arte, assim como busca pesquisar certas problemáticas acerca da percepção da imagem em movimento videográfica/fílmica e da construção de ambientes/instalações pontuais da história da arte. As produções artísticas selecionadas se justificam por sua importância na investigação dos postulados constitutivos essencialmente espaciais e/ou temporais como condição primeira à sua realização. Buscamos assimilar determinadas investigações históricas que expandiram os alargamentos das categorias artísticas com trabalhos que transitam entre-imagens. Outrossim, direcionamos uma importância ao artista estadunidense Bill Viola, das quais as propostas selecionadas para análise trazem no bojo de suas elaborações um desmembramento da pertinência física e conceitual que o postulado espaçotempo pode abarcar. Assim, a pesquisa caminha num espaço-entre, considerando tanto as expectativas que implicam as hibridizações/expansões da compreensão do espaço e do tempo quanto as contradições que podem expor fragmentariamente tal problemática na circunferência entre-campos (como os da imagem estática e imagem em movimento), amalgamando instalação, vídeo, consequentemente videoinstalação e cinema. Palavras-Chave: Imagem em movimento; Espaço-tempo; Videoinstalação; Cinema; Bill Viola

El hogar campesino en Virgilio y en Lugones

Partiendo de la idea de la indiscutida preeminencia de la cultura latina sobre la evolución del pensamiento de Occidente y en especial de la de Virgilio en la literatura, es objeto de este trabajo señalar las similitudes y diferencias con que aparece el tema del hogar campesino en las Geórgicas de Virgilio y en una oda de Lugones A los ganados y las mieses, de indudable espíritu virgiliano

Near-unity coupling efficiency of a quantum emitter to a photonic-crystal waveguide

A quantum emitter efficiently coupled to a nanophotonic waveguide constitutes a promising system for the realization of single-photon transistors, quantum-logic gates based on giant single-photon nonlinearities, and high bit-rate deterministic single-photon sources. The key figure of merit for such devices is the $\beta$-factor, which is the probability for an emitted single photon to be channeled into a desired waveguide mode. We report on the experimental achievement of $\beta = 98.43 \pm 0.04\%$ for a quantum dot coupled to a photonic-crystal waveguide, corresponding to a single-emitter cooperativity of $\eta = 62.7 \pm 1.5$. This constitutes a nearly ideal photon-matter interface where the quantum dot acts effectively as a 1D "artificial" atom, since it interacts almost exclusively with just a single propagating optical mode. The $\beta$-factor is found to be remarkably robust to variations in position and emission wavelength of the quantum dots. Our work demonstrates the extraordinary potential of photonic-crystal waveguides for highly efficient single-photon generation and on-chip photon-photon interaction

El humor de Juancito caminador

Raúl González Tuñón murió en Buenos Aires, el 14 de agosto de 1974, poco antes de cumplir sus setenta años, es decir que su vida siguió los pasos del siglo. Con su hermano Enrique, por quien sintió un afecto entrañable, inició su vida funambulesca por los barrios de Buenos Aires.

Single-photon nonlinear optics with a quantum dot in a waveguide

Strong nonlinear interactions between photons enable logic operations for both classical and quantum-information technology. Unfortunately, nonlinear interactions are usually feeble and therefore all-optical logic gates tend to be inefficient. A quantum emitter deterministically coupled to a propagating mode fundamentally changes the situation, since each photon inevitably interacts with the emitter, and highly correlated many-photon states may be created . Here we show that a single quantum dot in a photonic-crystal waveguide can be utilized as a giant nonlinearity sensitive at the single-photon level. The nonlinear response is revealed from the intensity and quantum statistics of the scattered photons, and contains contributions from an entangled photon-photon bound state. The quantum nonlinearity will find immediate applications for deterministic Bell-state measurements and single-photon transistors and paves the way to scalable waveguide-based photonic quantum-computing architectures

Meropenem-Vaborbactam as Salvage Therapy for Ceftazidime-Avibactam-, Cefiderocol-Resistant ST-512 Klebsiella pneumoniae-Producing KPC-31, a D179Y Variant of KPC-3

A 68-year-old man had recurrent bacteremia by Klebsiella pneumoniae carbapenemase (KPC)-producing K. pneumoniae resistant to ceftazidime-avibactam and cefiderocol. The sequencing of a target region showed that it harbored a KPC-3 variant enzyme (D179Y; KPC-31), which confers resistance to ceftazidime-avibactam and restores meropenem susceptibility. The patient was successfully treated with meropenem-vaborbactam

Características e controle da podridão "olho de boi" nas maçãs do sul do Brasil.

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Polar and non-polar organic binder characterization in Pompeian wall paintings: comparison to a simulated painting mimicking an a secco technique.

The use of Fourier transform infrared spectromicroscopy and mass spectrometry (MS) allowed us to characterize the composition of polar and non-polar binders present in sporadic wall paint fragments taken from Pompeii's archaeological excavation. The analyses of the polar and non-polar binder components extracted from paint powder layer showed the presence of amino acids, sugars, and fatty acids but the absence of proteinaceous material. These results are consistent with a water tempera painting mixture composed of pigments, flours, gums, and oils and are in agreement with those obtained from a simulated wall paint sample made for mimicking an ancient "a secco" technique. Notably, for the first time, we report the capability to discriminate by tandem MS the presence of free amino acids in the paint layer