Influence of Cutting Conditions on Tool Life, Tool Wear and Surface Finish in the Face Milling Process

The main goal of this work is to study the influence of cutting conditions - cutting speed, feed velocity and feed per tooth - on tool life and surface finish of the workpiece in the face milling of flat surfaces. Aiming to achieve this goal, several milling experiments were carried out with different cutting speeds, feed velocities and feeds per tooth. In the first phase of the experiments, cutting speed was varied without varying feed velocity, which caused a variation in feed per tooth. In the second phase of the experiments, cutting speed and feed velocity were varied in such a way that feed per tooth was kept constant. Tool flank wear and surface roughness of the workpiece were measured as cutting time elapsed. The main conclusions of this work are that a) cutting speed has a strong influence on tool life, regardless of whether feed velocity or feed per tooth varies and b) an increase in surface roughness of the workpiece is not closely related to an increase in wear of the primary cutting edge.

As mulheres por trás da face de Cristo: apropriações, performances e ambivalências da Verônica

Resumo Abordo neste artigo as apropriações culturais e transformações rituais da Verônica, o vero ícone, personagem vinculada à dramatização da paixão de Cristo, que remete tanto à mulher que teria o ajudado na via-crúcis, enxugando o seu rosto coberto de sangue e suor, quanto ao próprio tecido onde teria ficado impressa a face de Cristo. Relacionando o material etnográfico produzido em minha pesquisa sobre celebração da Semana Santa em Ouro Preto (MG) com o trabalho de outros autores, investigo as relações que se mantêm tanto entre as intérpretes da Verônica e seu público, quanto entre elas e o próprio personagem/artefato manipulado. Ao analisar as técnicas de interpretação e as ambivalências que se depreendem da pragmática ritual que envolve tal personagem, concluo que a Verônica (isto é, o “sudário”) pode ser compreendida como um tipo de “máscara”, uma persona que permite tanto mobilizar e exprimir certos estados interiores de suas performers, quanto conectar a corporalidade profana dessas intérpretes com a sacralidade ambígua do rosto de Cristo.

Bay of Bengal : a survey of the sea face of the Soondurbuns

Kartta kuuluu A. E. Nordenskiöldin kokoelmaan

Serotonergic modulation of face-emotion recognition

Facial expressions of basic emotions have been widely used to investigate the neural substrates of emotion processing, but little is known about the exact meaning of subjective changes provoked by perceiving facial expressions. Our assumption was that fearful faces would be related to the processing of potential threats, whereas angry faces would be related to the processing of proximal threats. Experimental studies have suggested that serotonin modulates the brain processes underlying defensive responses to environmental threats, facilitating risk assessment behavior elicited by potential threats and inhibiting fight or flight responses to proximal threats. In order to test these predictions about the relationship between fearful and angry faces and defensive behaviors, we carried out a review of the literature about the effects of pharmacological probes that affect 5-HT-mediated neurotransmission on the perception of emotional faces. The hypothesis that angry faces would be processed as a proximal threat and that, as a consequence, their recognition would be impaired by an increase in 5-HT function was not supported by the results reviewed. In contrast, most of the studies that evaluated the behavioral effects of serotonin challenges showed that increased 5-HT neurotransmission facilitates the recognition of fearful faces, whereas its decrease impairs the same performance. These results agree with the hypothesis that fearful faces are processed as potential threats and that 5-HT enhances this brain processing.

A novel polar-based human face recognition computational model

Motivated by a recently proposed biologically inspired face recognition approach, we investigated the relation between human behavior and a computational model based on Fourier-Bessel (FB) spatial patterns. We measured human recognition performance of FB filtered face images using an 8-alternative forced-choice method. Test stimuli were generated by converting the images from the spatial to the FB domain, filtering the resulting coefficients with a band-pass filter, and finally taking the inverse FB transformation of the filtered coefficients. The performance of the computational models was tested using a simulation of the psychophysical experiment. In the FB model, face images were first filtered by simulated V1- type neurons and later analyzed globally for their content of FB components. In general, there was a higher human contrast sensitivity to radially than to angularly filtered images, but both functions peaked at the 11.3-16 frequency interval. The FB-based model presented similar behavior with regard to peak position and relative sensitivity, but had a wider frequency band width and a narrower response range. The response pattern of two alternative models, based on local FB analysis and on raw luminance, strongly diverged from the human behavior patterns. These results suggest that human performance can be constrained by the type of information conveyed by polar patterns, and consequently that humans might use FB-like spatial patterns in face processing.

Ação antioxidante de especiarias face diferentes atividades de água

Propriedades antioxidantes de algumas especiarias foram estudadas em sistemas modelos liofilizados baseados em celulose microcristalina. Como substrato oxidável foi utilizado o metil linoleato. A oxidação foi acompanhada manometricamente em amostras ajustadas para várias atividades de água. Os resultados obtidos indicam que extrato etéreo de salsa (Petroselium sativun, Hoffm) e de coentro (Coriandrum sativum L) ao nível de 8% aumentam a estabilidade do substrato lipídico. Sendo que a atuação da salsa superou a dos demais antioxidantes empregados neste estudo inclusive dos sintéticos. Idêntica reação, entretanto, não ocorreu em relação aos extratos aquosos destas mesmas especiarias, na concentração de 8%, cujos resultados no tocante à proteção do sistema contra a oxidação foram bastante inferiores. Em relação ao extrato aquoso de cebolinha os resultados podem ser considerados nulos. A redução da concentração dos extratos de coentro: etéreo e aquoso, acarretou marcante diminuição na sua potência. No tocante à água esta apresentou um efeito inibidor frente a reação de oxidação, na dependência da atividade de água empregada.

Mémoire relatif au projet de l'ouverture d'une nouvelle porte dans la face gauche du bastion de Champmars pour communiquer dans l'enceinte du grand Champmars

Ancien possesseur : Argenson, Antoine-René de Voyer (1722-1787 ; marquis de Paulmy d')

[Portrait d'homme, en buste, de face] : [photographie] / Non identifié

Ancien possesseur : Gilles, Albert (1873-1959)

[Portrait de jeune homme, à mi-genoux, debout, de face, appuyé à une balustrade] : [photographie] / Victor Plumier

Ancien possesseur : Gilles, Albert (1873-1959)

[Portrait d'homme, à mi-genoux, assis, de trois-quarts à gauche, tête de face, l'avant-bras droit posé sur un guéridon] : [photographie] / Non identifié

Ancien possesseur : Gilles, Albert (1873-1959)