USO DA RMN DE BAIXA RESOLUÇÃO NA AVALIAÇÃO DA DINÂMICA MOLECULAR DO Origanum vulgare

In this work, proton NMR relaxometry was used to measure the behavior of spin-lattice relaxation time with T1H as the time constant, and also of spin-spin relaxation time with the time constant T2H. These relaxometry parameters were determined to better understand the changes in the main structures present in commercial and in nature forms of origanum. The T1H relaxation data showed that the structures which had higher molecular mass were more sensitive to degradation with increased temperature treatment. According to the values of the T2H parameter, up to 150 degrees no significant change in the mobility and organization of water was observed. These data infer that the ideal cooking temperature and tea preparation mode for this herb should be around 100 degrees for the sample not to lose its characteristics. Also, it is not advisable to cook this herb at higher than 150 degrees but better to consume it at room temperature, especially give commercial herb has already been dehydrated.

The role of the poet in Plato's ideal cities of Callipolis and Magnesia

Plato's attitude toward the poets and poetry has always been a flashpoint of debate, controversy and notoriety, but most scholars have failed to see their central role in the ideal cities of the Republic and the Laws, that is, Callipolis and Magnesia. In this paper, I argue that in neither dialogue does Plato "exile" the poets, but, instead, believes they must, like all citizens, exercise the expertise proper to their profession, allowing them the right to become full-fledged participants in the productive class. Moreover, attention to certain details reveals that Plato harnesses both positive and negative factors in poetry to bring his ideal cities closer to a practical realization. The status of the poet and his craft in this context has rarely to my knowledge been addressed.

Use of interactive performance optimization for identifying the ideal profile of swine finishing producers

The present research aimed to develop a modeling capable of identifying the ideal profile of swine finishing producers using the interactive performance optimization, which began by verifying qualitative the criteria considered most relevant to the decision-making, generating a closed structured diagnosis that covers the socioeconomic aspects about the activity, until the design of a mathematical model able to translate the data obtained in quantitative information. For the verification, it was proposed a practical study for a universe of 120 members of a cooperative in the state of Rio Grande do Sul, Brazil. The results showed that, from the application and the definition of the ideal profile, it was possible to verify that 82 producers are in the group of those who have obtained a "Good" performance, and to 44 the result is in the range between 86% to 90% from the ideal, which means that most have short or medium-term conditions to evolve their status for the considered "Very Good", where only 12.5% of the producers are currently.

Momento ideal para a endarterectomia de carótida após um AVC recente

Vários estudos prospectivos de escolha aleatória confirmaram a eficácia da endarterectomia de carótida na prevenção de novos acidentes vasculares cerebrais (AVC) em pacientes sintomáticos com estenose grave na carótida. Entretanto, o timing da endarterectomia ainda é controverso. A cirurgia precoce pode estar associada à hemorragia intracerebral e à extensão do infarto inicial. A cirurgia tardia pode expor o paciente à recorrência do AVC e à oclusão da artéria carótida. Os estudos que avaliaram o intervalo de tempo para a endarterectomia são retrospectivos e não randomizados. Na ausência de um estudo prospectivo randomizado comparando endarterectomia precoce e tardia, uma abordagem para se interpretar os resultados das séries cirúrgicas é a comparação destes com a história natural do AVC isquêmico. Os autores descrevem os argumentos em favor da cirurgia precoce, a história natural do AVC isquêmico e os fatores de risco associados ao AVC no perioperatório da endarterectomia.

Traqueostomia percutânea: técnica ideal?

A traqueostomia percutânea tem substituído a traqueostomia convencional em muitas Unidades de Terapia Intensiva, devido à facilidade e segurança do método realizado à beira do leito, dispensando o transporte do paciente da Unidade de Terapia Intensiva para o Centro Cirúrgico. Alguns autores sugerem que a dissecção limitada resulta em menor dano tecidual, diminui o risco de sangramento e infecção de ferida operatória. Esta revisão visa analisar e sintetizar estudos prospectivos e randomizados, revisões sistemáticas e meta-análises, comparando a traqueostomia percutânea e traqueostomia convencional em pacientes adultos em Unidades de Terapia Intensiva.

Flows of Bingham Materials Through Ideal Porous Media: an Experimental and Theoretical Study

The flow of Bingham liquids through porous media has been studied. Experiments have been performed to determine the flow rate / pressure drop relationship for the flow of a grease of Binghamian rheological behavior through an array of rods of circular cross section. The yield stress and plastic viscosity of the grease have been determined with the aid of a controlled stress rotational rheometer. To investigate a wider range of the flow parameters, the mass and momentum conservation equations have been solved numerically, in conjunction with the generalized Newtonian constitutive law and the bi-viscosity model. The finite volume method has been employed to obtain the numerical solution. These numerical results also yielded a flow rate / pressure drop relationship, which is in very good agreement with the experimental results. A capillaric theory has been developed to determine an analytical relationship between the flow rate and pressure drop for flows of Bingham liquids through porous media. It is shown that the predictions of this theory are in good agreement with the experimental and numerical results.

Analysis of Regular and Irregular Dynamics of a Non Ideal Gear Rattling Problem

This paper presents a study on the dynamics of the rattling problem in gearboxes under non-ideal excitation. The subject has being analyzed by a number of authors such as Karagiannis and Pfeiffer (1991), for the ideal excitation case. An interesting model of the same problem by Moon (1992) has been recently used by Souza and Caldas (1999) to detect chaotic behavior. We consider two spur gears with different diameters and gaps between the teeth. Suppose the motion of one gear to be given while the motion of the other is governed by its dynamics. In the ideal case, the driving wheel is supposed to undergo a sinusoidal motion with given constant amplitude and frequency. In this paper, we consider the motion to be a function of the system response and a limited energy source is adopted. Thus an extra degree of freedom is introduced in the problem. The equations of motion are obtained via a Lagrangian approach with some assumed characteristic torque curves. Next, extensive numerical integration is used to detect some interesting geometrical aspects of regular and irregular motions of the system response.

Application of the center manifold theory to the study of slewing flexible Non-ideal structures with nonlinear curvature: a case study

In this paper is Analyzed the local dynamical behavior of a slewing flexible structure considering nonlinear curvature. The dynamics of the original (nonlinear) governing equations of motion are reduced to the center manifold in the neighborhood of an equilibrium solution with the purpose of locally study the stability of the system. In this critical point, a Hopf bifurcation occurs. In this region, one can find values for the control parameter (structural damping coefficient) where the system is unstable and values where the system stability is assured (periodic motion). This local analysis of the system reduced to the center manifold assures the stable / unstable behavior of the original system around a known solution.

On non-ideal and non-linear portal frame dynamics analysis using bogoliubov averaging method

We apply the Bogoliubov Averaging Method to the study of the vibrations of an elastic foundation, forced by a Non-ideal energy source. The considered model consists of a portal plane frame with quadratic nonlinearities, with internal resonance 1:2, supporting a direct current motor with limited power. The non-ideal excitation is in primary resonance in the order of one-half with the second mode frequency. The results of the averaging method, plotted in time evolution curve and phase diagrams are compared to those obtained by numerically integrating of the original differential equations. The presence of the saturation phenomenon is verified by analytical procedures.

Ideal sweetness of mixed juices from Amazon fruits

Ready-to-drink fruit juices represent a large share of the market and are an important target for product development. The mixture of fruits can bring about improvements to nutritional and sensory aspects of these beverages while making used of the wide variety of exotic fruits from the Amazon region. Therefore, it is necessary to select mixed fruits and determine their ideal sweetness according to consumer acceptance. Consumers in the city of Belém (Brazil) evaluated five different concentrations of sugar using the just-about-right scale in two blends selected by preference ranking. For the cupuassu-acerola-açai blend, the optimum concentration of sugar was 9.5 g/100 mL, and for the soursop-camucamu-yellow mombin blend, it was 10.7 g/100 mL.

Development of pitanga nectar with different sweeteners by sensory analysis: ideal pulp dilution, ideal sweetness, and sweetness equivalence

The objective of this study was to develop pitanga nectar formulations in which sucrose was replaced with different sweeteners. Consumer tests were conducted with 50 fruit juice consumers, and a just-about-right scale was used to determine the ideal pulp dilution and ideal sweetness with sucrose. Furthermore, the adequate concentrations of six sweeteners were determined to obtain the equivalent sweetness of sucrose using relative to these concentrations the magnitude estimation model with 19 selected assessors. The ideal dilution test resulted in 25% pulp, and the ideal sweetness test, 10% sucrose. Sweetener concentrations to replace sucrose were 0.0160%, 0.0541%, 0.1000%, 0.0999%, 0.0017%, and 0.0360%, respectively, for sucralose, aspartame, stevia 40% rebaudioside A, stevia 95% rebaudioside A, neotame, and a 2:1 cyclamate/saccharin blend. These results can be used to prepare pitanga nectar with different sweeteners and obtain the same sweetness intensity in less caloric products than that of nectar prepared with sucrose.

A hipotética linguagem ideal de Platão

Para que um discurso sobre o espetáculo do mundo transcendente seja acolhido como totalidade inteligível e coerente, urge desvencilhar-se da arbitrariedade do domínio de trêmulos contornos do sensível, esfera de opiniões apenas. É o que propõe Platão, na esteira das reflexões dos primeiros pensadores: para suprir deficiências que causam a elisão da realidade e transformar a linguagem num veículo de intelecção autêntica dos conceitos essenciais de um pensar filosófico, ele a coloca no centro de uma especulação rigorosa. Tal como seus antecessores Heráclito e Parmênides, Platão revela logofilia ao empenhar-se na construção de uma nova estrutura discursiva, diferente daquela do homem comum, desencadeando no campo da Filosofia uma revolução que se tornara indispensável: elabora um modelo fundador - princípio de uma ordem permanente propedêutica à construção de uma linguagem formal e abstrata - referente a entes que os homens, na maioria, por si mesmos não conseguem visualizar. Somente nela poderá reverberar a verdade universal das Formas que, ao emprestarem seus nomes à infindável série dos particulares sensíveis, os clarifica e lhes confere significação. Com as teorias que a partir das Formas desenvolve e expõe nos Diálogos, o filósofo visa induzir o leitor a preparar-se para operar, metodicamente, a conversão de sua alma ao plano desses seres ideais, supra-sensíveis, e apreender, assim, a realidade que tudo fundamenta e torna cognoscível.

O ideal de Baudelaire por Walter Benjamin

O artigo examina a interpretação feita por Walter Benjamin dos poemas de Charles Baudelaire marcados pela noção de ideal, a qual se opõe ao spleen. Benjamin encontra aí o esforço de rememoração de uma experiência plena, a qual constituiria, por sua vez, um elemento essencial à compreensão da modernidade como impossibilidade desta forma de experiência. Com as noções de beleza e de aura, o artigo busca ainda salientar a importância da categoria da distância para a configuração desta forma de experiência.

La felicidad como ideal de la imaginación

En este artículo intentamos desarrollar mínimamente los cinco discursos sobre la felicidad que hemos encontrado en la obra de Kant. Los hemos encontrado con dificultad, porque no se trata de discursos ordenados ni continuados a lo largo de sus páginas, sino más bien de sugerencias que van apareciendo de vez en cuando al hilo de otras reflexiones. La felicidad se dibuja como totalidad, como un concepto indeterminado, como el polo opuesto a la cultura, como sentimiento y como bien. Aunque no se trate de discursos bien enlazados, es posible seguirles la pista a lo largo de los textos. No obstante, hay otra sugerencia que Kant nos proporciona y que él mismo no desarrolla en absoluto: según ella la felicidad sería el ideal de la imaginación. Este sexto discurso no pronunciado tal vez pudiera suministrar la clave que nos sirva para encontrar la coherencia de los demás.

Mundo Real e Mundo Ideal em Rousseau: da Necessidade da Ficção para Pensar o Político

RESUMO:A hipótese desenvolvida nos leva a confrontar três textos do corpusrousseauísta: o Segundo Discurso, Júlia ou A Nova Heloísa e o extrato do Primeiro Diálogo, em que há a ficção do mundo ideal, textos que, apesar do seu estatuto genérico diferente, estão em coerência e convergência teórica. Desejamos evidenciar um aspecto da unidade problemática do pensamento de Rousseau concernente à abordagem crítica da sociedade de seus contemporâneos e sua concepção do papel das Letras e dos Espetáculos. A preocupação do filósofo é de refundar a natureza humana, a fim de lançar as bases de uma nova organização social. Nessa empreitada, a ficção desempenha um papel crucial, o prefácio do Segundo Discurso o comprova: para bem conhecer o homem atual, deve-se supor o que ele não é mais. O homem do estado de natureza, ser de ficção, cujas paixões são retas e naturais, é o modelo teórico que reativa a sociedade dos seres ideais de Júlia. Dessa forma, a ficção é chamada a desempenhar um papel referencial fundamental para o pensamento social e político de Rousseau, aparecendo como um poderoso meio de ação sobre o público. O romance pode reeducar os povos corrompidos, pois, assim como o teatro, como denuncia a Carta a d’Alembert, possui os meios para perverter uma sociedade tida como virtuosa.