Experimental Observation of Environment-induced Sudden Death of Entanglement

We demonstrate the difference between local, single-particle dynamics and global dynamics of entangled quantum systems coupled to independent environments. Using an all-optical experimental setup, we show that, while the environment-induced decay of each system is asymptotic, quantum entanglement may suddenly disappear. This "sudden death" constitutes yet another distinct and counter-intuitive trait of entanglement.Comment: 4 pages, 4 figure

Influence of the anisotropic behavior on equibiaxial paths

Marciniak and Nakajima tests are commonly used in building FLD's, since they allow covering all regions from uniaxial to almost equibiaxial strain paths. In this work, the deviation from equibiaxial strain paths is analyzed as function of the material anisotropic behavior. The numerical results show that material with r0 = r90 present equibiaxial stress and strain paths, while for the ones with r0 ≠ r90 the paths are neither equibiaxial in stress nor strain. Moreover, it is shown that despite the similarities between the two tests, they present different sensitivity to the control of the blank holder force and to the friction coefficient. Namely, the stress and strain paths in the Marciniak specimen center are more sensitive to the control of the blank holder force. On the other hand, the stress and strain paths in the Nakajima specimen center are more sensitive to the friction coefficient. The deviation from the equibiaxial strain path indicates that the stress ratio is also not necessarily 1.0, meaning that the stress triaxiality and the Lode parameter also present some deviation from the reference values for an equibiaxial stress state. This should be taken into account when analyzing forming limit results.The authors gratefully acknowledge the financial support of the projects POCI-01-0145-FEDER030592 (PTDC/EME-EME/30592/2017) and UIDB/00285/2020 financed by the Operational Program for Competitiveness and Internationalization, in its FEDER/FNR component, and the Portuguese Foundation of Science and Technology (FCT), in its State Budget component (OE)

Partial purification and thermal stability of two peroxidases from Pithecellobium dulce (Roxb.) Benth. Aril.

Abstract: Two peroxidase (POX) forms, named PdPI and PdPII, were partially purified from the Pithecellobium dulce aril, using ammonium sulfate precipitation and anion exchange chromatography. Zymography of the proteins obtained after precipitation in the range of 60-90% ammonium sulfate (F6090 fraction) showed two bands with peroxidase activity. In DE-52 cellulose column, the peroxidase activity was detected in unadsorbed peak (PdPI) and adsorbed peak eluted with 0.2 mol L-1 NaCl (PdPII) suggesting that PdPI (~114 KDa) and PdPII (~77 KDa) are basic and acidic proteins, respectively, being PdPI stable at 80 ºC. This is the first report of partial purification of POX from P. dulce aril, indicating that this species may be a new source of enzymes for use in biosensors and other biotechnological applications. [Purificação Parcial e Estabilidade Térmica de Duas Peroxidases Extraídas de Arilos de Pithecellobium dulce (Roxb.) Benth]. Resumo: Duas formas de peroxidase (POX), denominadas PdPI e PdPII, foram parcialmente purificadas de arilos de Pithecellobium dulce, utilizando precipitação com sulfato de amônio e cromatografia de troca iônica. O zimograma das proteínas obtidas após precipitação com sulfato de amônio na faixa de 60 a 90% de saturação (fração F6090), mostrou duas bandas com atividade peroxidásica. Na coluna de celulose DE-52, a atividade peroxidásica foi detectada nos picos não adsorvido (PdPI) e adsorvido (PdPII) eluído com NaCl 0,2 mol L-1, sugerindo que a PdPI (~114 KDa) e a PdPII (~77 KDa) são proteínas básicas e ácidas, respectivamente, sendo a PdPI estável a 80 ºC. Este é o primeiro relato de purificação parcial de POX obtida de arilos de P. dulce, indicando que esta espécie pode ser uma nova fonte de enzimas para utilização em biossensores e outras aplicações biotecnológicas.[HEVILA OLIVEIRA SALLES FIGUEIREDO]

Seleção dos animais e cuidados pré, dcurante e pós-cirúrgicos na fistulação ruminal em caprinos e ovinos.

Estudos experimentais em nutrição animal freqüentemente demandam uso de animais canulados para ter acesso ao conteúdo gastrointestinal sendo assim, são submetidos a procedimentos cirúrgicos para criação de uma fístula. Esta técnica experimental trouxe consideráveis avanços para nutrição de ruminantes, pois, foi possível, por exemplo, definir ou mensurar a fração do alimento que sofre degradação ruminal. A determinação desta fração dos alimentos é importante uma vez que atende com mais eficiência os requerimentos dos microrganismos ruminais melhorando a fermentação e conseqüentemente repercutindo positivamente no desempenho animal. O uso de animais em ensaios experimentais para gerar tais informações requer cuidados antes, durantes e após o procedimento cirúrgico e observações constantes a campo. Os resultados obtidos e a longevidade desses animais dependem de tais cuidados. Neste contexto o presente artigo aponta parâmetros adequados para seleção de animais que serão destinados a fistulação do rúmen além de cuidados pré, durante e pós-cirúrgicos.bitstream/CNPC-2010/23058/1/doc92.pd

Ensaio alternativo para triagem de extratos protéicos com atividade celulolítica.

Este comunicado apresenta uma metodologia de difusão radial em gel de agarose (DRGA) desenvolvida por Teather e Wood (1982), modificada por Rehman et al. (2009), e adaptada no Laboratório de Bioquímica da Embrapa Caprinos e Ovinos para avaliar a atividade celulolítica em extratos proteicos de microrganismos ruminais. A técnica baseia-se na difusão radial, em gel de agarose, das proteínas da amostra analisada. O gel contém o substrato específico para celulase, a carboximetilcelulose, que pode ser corada com o corante vermelho congo.bitstream/item/31686/1/UMT-Cot112.pd

Effects of the seal wire on the nonlinear dynamics of the aircraft engine turbine blades

Complicated systems made of multiple components are known to be difficult to model, considering their solutions can change dramatically even with the slightest variations in conditions. Aircraft engines contain such complicated systems, and some components in aircraft engines' turbines can cause significant changes in the system's overall response. Hence, this study is focused on investigating the behavior of a turbine blade of an aircraft engine and the effects of the contact between the blade and the seal wire on the dynamics of the blade-disk system. The investigation is performed via various numerical simulations in time and frequency domains. One sector of the bladed disk is modeled using the finite element method with the lock plate and the seal wire imposing cyclic symmetry boundary conditions in the static, modal, and frequency domain forced response analyses. In time domain analyses, the cyclic symmetry is replaced with simplified displacement restricting boundary conditions. The time domain analysis contains steady-state forced responses of the system. The results show that contact with the seal wire is not a major source of nonlinearity and damping. The contacts with the lock plate contribute more to the vibration damping than the seal wire. However, compared to the contacts at the root of the blade, both components remain less significant with regard to frictional damping and nonlinearity

The Promethean: Fall 2012

Fall 2012 edition of The Promethean. Contents: From the Director 2 Honors Study Abroad 4 Tips for Writing Your Senior Thesis 6 Collected Poetry 8 Freshman Experience Articles 9 Remembering Alex Kogut 10https://digitalcommons.brockport.edu/promethean/1007/thumbnail.jp

Utilização de extrato aquoso das sementes de gergelim como substrato para o crescimento de bactérias lácteas probióticas.

Objetivou-se com este estudo avaliar o desempenho do crescimento da cepa probiótica comercial (Lactobacillus rhamnosusLr-32), FlorafitTM Probiotics, DuPont® em associação com uma cepa iniciadora (starter) de Streptococcus thermophilus TA-40 Yo-MixTM Yogurt Cultures DuPont® em extrato aquoso (EA) de sementes do gergelim. Para obtenção do EA 200 g de sementes, foram imersas em 500 mL de água destilada, por 1 hora, sendo a água de imersão desprezada e as sementes trituradas com água destilada (200 g/700 mL) e o homogeneizado filtrado. Prepararam-se duas formulações (F1, F2) contendo 100 mL do EA (F1) e o controle com 100 mL de leite de cabra (F2). As formulações foram aquecidas a 80 °C por 15 minutos, resfriadas a 37 °C para inoculação de Lr-32 e TA-40 na proporção de 0,024 g e 0,003 g, respectivamente, e incubadas por 24 horas a 37 °C. . O extrato de gergelim apresenta grande potencial para ser utilizado como sucedâneo do leite, pois permite excelente crescimento de microrganismos lácteos similar ao leite caprino. Além de mostrarem em todos os tratamentos capacidade de desenvolvimento em simbiose, pois não apresentaram competição entre as cepas comprovado pelos resultados de crescimento bastante similares

Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment

We report on an experimental investigation of the dynamics of entanglement between a single qubit and its environment, as well as for pairs of qubits interacting independently with individual environments, using photons obtained from parametric down-conversion. The qubits are encoded in the polarizations of single photons, while the interaction with the environment is implemented by coupling the polarization of each photon with its momentum. A convenient Sagnac interferometer allows for the implementation of several decoherence channels and for the continuous monitoring of the environment. For an initially-entangled photon pair, one observes the vanishing of entanglement before coherence disappears. For a single qubit interacting with an environment, the dynamics of complementarity relations connecting single-qubit properties and its entanglement with the environment is experimentally determined. The evolution of a single qubit under continuous monitoring of the environment is investigated, demonstrating that a qubit may decay even when the environment is found in the unexcited state. This implies that entanglement can be increased by local continuous monitoring, which is equivalent to entanglement distillation. We also present a detailed analysis of the transfer of entanglement from the two-qubit system to the two corresponding environments, between which entanglement may suddenly appear, and show instances for which no entanglement is created between dephasing environments, nor between each of them and the corresponding qubit: the initial two-qubit entanglement gets transformed into legitimate multiqubit entanglement of the Greenberger-Horne-Zeilinger (GHZ) type.Comment: 15 pages, 14 figures; only .ps was working, now .pdf is also availabl