Showing papers by "Federal University of Rio de Janeiro published in 1970"

Discussion of the circular and logarithmic spiral slip surfaces

Abstract: MR CHEN DOES NOT AGREE WITH THE AUTHOR IN THE CONCLUSION THAT THERE IS NO JUSTIFICATION FOR ASSUMING THAT THE SHAPE OF THE SPIRAL IS DETERMINED BY THE VALUE OF THE ANGLE OF SHEARING RESISTANCE THE RESULTS REPORTED EMPHASIZE THE POINT THAT THE PARTICULAR CHOICE OF THE ANGLE OF THE SPIRAL CURVE BEING EQUAL TO THE ANGLE OF SHEARING RESISTANCE OF THE SOIL IS A VERY PROPER ONE THE VARIOUS NORMAL STRESS ASSUMPTIONS FOR THE CIRCULAR ARC SLIP SURFACE LEAD ONLY TO MINOR DIFFERENCES IN THE STABILITY CONDITIONS, AS POINTED OUT BY TAYLOR THE RESULTS REPORTED BY THE AUTHOR FURTHER DEMONSTRATE THAT THE STABILITY CONDITIONS ARE NOT SENSITIVE TO THE VARIOUS SHAPES OF THE SPIRAL SURFACE FOR WHICH THE CIRCULAR ARC IS A SPECIAL CASE THE PROBLEM OF FINDING THE DISTRIBUTION FUNCTION IS STATED THE USE OF SPIRAL SURFACE OF THE ANGLE DOES NOT REQUIRE THE ASSUMPTION OF NORMAL STRESS DISTRIBUTION ALONG THE SURFACE AND, IN ADDITION, PERMITS THE STABILITY PROBLEM TO BE SOLVED IN A RELATIVELY SIMPLE MATHEMATICAL FORM MR DA SILVEIRA PRESENTS THE RESULTS OF STUDY ON THE QUESTION OF SHEARING FORCES ON VERTICAL PLANES, WHICH ARE CONNECTED TO THE VALIDITY OF THE HYPOTHESIS OF SLIP SURFACES FOR THE INVESTIGATION OF THE LIMIT EQUILIBRIUM OF SOILS THE METHOD OF VIRTUAL WORK GIVES THE SAFETY FACTOR AS THE RATIO BETWEEN THE RESISTING WORK FORCES TO THE WORK REALIZED BY DISTURBING FORCES, IF ONLY TANGENTIAL FORCES, APPLIED ALONG THE SLIDING SURFACES, ARE CONSIDERED RESULTS PRESENTED IN A TABLE EXPRESS CONCLUSIVELY THAT THE CYLINDER OF REVOLUTION MUST BE THE SLIDING SURFACE CORRESPONDING TO THE LIMIT EQUILIBRIUM FOR THIS LOADING CASE A DIGITAL COMPUTING PROGRAM CAN BE EASILY MODIFIED TO BE USED FOR CHECKING DIFFERENT SLIDING SURFACES AND THE EFFECT OF ANY LOAD GROUPS REFERENCES: CIRCULAR AND LOGARITHMIC SPIRAL SLIP SURFACES, ERIC SPENCER, ASCE PROC PAPER 6361, JANUARY 1969

Parametric Resonance in Certain Nonlinear Systems

Abstract: In a number of mechanical problems, systems of differential equations with periodic coefficients have to be considered, which, in general, possess not only linear but also nonlinear terms. In this paper, the first order instability region of the Mathieu equation is examined when additional nonlinear terms are present. These terms can be of the damping or restoring type.

O patrão e as empregadas domésticas

Abstract: Este artigo e baseado na experiencia direta do autor com empregadas domesticas. Trata-se, assim, de uma etnografia marcada por um depoimento pessoal que refere-se a varios anos de interacao e convivio com essa categoria social. Pretende ser, sobretudo, um comentario etnografico sobre relacoes entre categorias sociais na sociedade brasileira contemporânea, em processo de transformacao. Esta presente tambem a questao de genero, desde que esta sendo analisada a relacao entre um patrao e suas empregadas domesticas. Ha intencao tambem de valorizar a pesquisa do cotidiano domestico contemporâneo.

Corpo e linguagem ( Body and language )

Abstract: O corpo imaginario nao e apanagio do corpo humano, pois como res extensa ele pode ser medido e pesado como qualquer objeto do mundo fenomenico: corpo, cadeira, mesa, lapis. Assim como se pode descrever suas caracteristicas e atributos como de qualquer objeto. O corpo humano e mais um objeto do mundo fenomenico. O corpo simbolico nao e tampouco necessariamente o corpo vivo, pois o cadaver tambem tem essas caracteristicas. Ele esta preso na cadeia da linguagem e e mortificado pelo significante ao ser tomado no registro simbolico. O significante mapeia o corpo e nele escreve a historia e a anatomia histerica proprias a cada um. O corpo e um corpo histoerico . Mas esse corpo pode estar morto ou vivo, estar calado no silencio da pulsao de morte ou vibrar com Eros. Para estar vivo este corpo precisa ser tambem um corpo que goza. Deste modo o corpo esta nos tres registros: no imaginario do espaco, no simbolico da linguagem e goza como corpo real. PALAVRAS-CHAVE: Corpo. Imaginario. Lalingua. Gozo. ABSTRACT The imaginary body is not an appanage of the human body because as res extensia it can be measured and weighed as any object of the phenomenal world: body, chair, table, pencil. Similarly, one can describe its characteristics and attributes as the ones in any other object. Therefore, the human body is another object of the phenomenal world. The symbolic body is not necessarily the living body because the corpse also has these characteristics. The body is stuck to the chain of language and is mortified by the signifier as it is taken to the symbolic register. The signifier maps the body and it writes in it both the history and the hysterical anatomy of each one. We might as well call it a hystoerical body. However, this body can be dead or alive, quiet in the silence of the death drive or vibrating with Eros. In order to be alive it also needs to be a body that enjoys itself. Thus, the body belongs to the three registers: the imaginary space, the symbolic language and the enjoyment a real body can have. KEYWORDS: Body. Imaginary. Lalangue. Enjoyment (jouissance).

Constructing Data Mining Functionalities In ADBMS

Abstract: One of the main obstacles in applying data mining techniques to large, realworld databases is the lack of integration between applications and the database management system where the collection of target data is stored. In these applications, data are obtained by applying an SQL query to that database and then stored in flat files for further processing. As a result, these applications cannot benefit from previously implemented functionalities of the accessed database management system. In this paper, we present an architecture for rule extraction applications development. This architecture is constructed by adding the functionalities required in order to accomplish the extraction of rules from a database. Moreover, this architecture enables the standard and efficient construction of data mining applications for rule extraction. Transactions on Information and Communications Technologies vol 19 © 1998 WIT Press, www.witpress.com, ISSN 1743-3517

Physiology of a choline-requiring strain of Torulopsis pintolopesii.

Abstract: A choline-requiring strain of Torulopsis pintolopesii when growing on choline-methyl-14C or choline-methyl-3H excretes the radioactivity incorporated in the first 24–48 h of incubation up to ca. 85–95% of the radioactivity added at the beginning of the incubation. The addition of non-radioactive methionine did not interfere with the uptake and excretion of radioactivity from choline-Me-14C. Radioactive methyl group of methionine previously incorporated by growing cells of T. pintolopesii on varying concentrations of choline was not excreted in appreciable amounts. No evidence was obtained for the oxidation of choline to betaine, degradation to trimethylamine, or net incorporation of labelled choline into lecithin. The occurrence of a new pathway for the utilization of choline in yeasts is suggested. The requirement of choline by T. pintolopesii is explained tentatively by the formation and excretion of a compound containing the carbon and hydrogen atoms from the methyl groups of choline and whose chemical structure still under study, may comprise a heteroside containing mannitol as the polyhydroxylated moiety.

Zur Umkehrung des Satzes von Lagrange über die Stabilität

Abstract: The theorem of Lagrange-Dirichlet states that the equilibrium of a discrete conservative holonomous mechanical system is stable if the potential energy assumes a minimum in this position. It seems physically obvious that the equilibrium is unstable in case of a maximum of the potential energy. This question was examined by Liapunov and Chetayev, but until now the inversion of the theorem of Lagrange has only been proved under very restrictive conditions.

A convenient technique for determination of reactivity ratios

Abstract: A new technique to determine the reactivity ratios for monomers is described It is based on vapor-phase chromatography and can be used for any volatile monomer A new simplified equation was deduced which permits the direct use of the retention times to obtain the pair r1r2 The method is suggested for use in determination of the molar ratios of the chemical units in the polymer chain, regardless of chemical composition or constitution The simplicity of this technique allows its use for monomer–polymer systems composed of any number of volatile monomers The validity of this method was checked by using the pair methyl methacrylate–styrene This technique is also being applied to the study of kinetics in polymerizations, since it allows the measurements of several samples taken from a single experiment

A Knowledge-Based Perspective Of TheDistributed Design Of Object OrientedDatabases

Abstract: The performance of applications on Object Oriented Database Management Systems (OODBMSs) is strongly affected by Distributed Design, which reduces irrelevant data accessed by applications and data exchange among sites. In an OO environment, the Distributed Design is a very complex task, and an open research problem. In this work we propose a knowledge based approach to the fragmentation phase of the distributed design of object oriented databases. In this approach, we will show a rule-based implementation of an analysis algorithm from our previous work and propose some ideas towards the use of Inductive Logic Programming (ILP) to perform a knowledge discovery/revision process using our set of rules as background knowledge. The objective of the work is to uncover some previously unknown issues to be considered in the distributed design process. Our main objective here is to show the viability of performing a revision process in order to obtain better and better fragmentation algorithms. We do not intend to propose the best fragmentation algorithm ever possible. We concentrate here on the process of revising a DDOODB algorithm through Knowledge Discovery techniques, rather than only obtaining a final optimal algorithm. Transactions on Information and Communications Technologies vol 19 © 1998 WIT Press, www.witpress.com, ISSN 1743-3517

Panem et circenses [1] at Largo da Carioca, Brazil: the urban diversity focused on people-environment interactions

Abstract: This paper explores how outdoor performances actively define and create the essential character of open spaces in Brazil, a country known for its overwhelming abundance of outdoor life. We investigate the importance of open spaces within the urban fabric, and consider the ways in which the history and aspirations of the local community become meaningfully woven into these spaces. We chose an open space, or largo 3 , in the city of Rio de Janeiro called Largo da Carioca, which embodies the relation between collective memory and appropriation. We then consider how the Largo has consistently been used as an arena of performance despite the intense urban changes and movement of people over the last 50 years. As a way of grasping the dynamic of the activities of the Largo da Carioca we adopted two approaches: historical-evolutive and participant observation. The first concerns the evolution of the urban space of Largo da Carioca and the background of outdoor performances as a way of introducing the popular arts of Rio de Janeiro, and as a way of connecting our theoretical analysis to the field research. In the second approach we use tools and methods from ethnographic research such as field annotations, direct interviews and visual resources, like photographs and video-shooting, so as to fulfill and complement our work. We argue that the urban essence of these performances is related to the ‘inviting’ conditions of this particular urban site and to its (in)formal structures, uses and regular activities. It invites – because of its openness, formal and social largeness and amplitude – a singular melange of uses and appropriations through which the formal and social are amalgamated – for, as one informant said, it is ‘an open space of constant comings and goings’ (Igor Ferreira, 13/07/03).

Aneurismas da artéria comunicante anterior: considerações sobre 14 casos operados

Abstract: Apos algumas consideracoes sobre a frequencia e o quadro clinico dos aneurismas da arteria comunicante anterior, e relatada a experiencia do autor, constante de 14 casos operados: nove pacientes se recuperaram totalmente, um sobreviveu com incapacidade parcial e quatro faleceram. O tratamento cirurgico, apesar de todos os percalcos, e ainda a melhor terapeutica, quando possivel. Para a indicacao cirurgica quanto as condicoes do paciente, foi seguida a classificacao de Boterell e col. modificada por Hunt e Hess.

Condiderações Adicionais Sobre Investimentos

Abstract: Temos repetido que enquanto os economistas não deram ênfase à produção indireta, o conceito de investimento manteve-se nebuloso. ~ que a caracterização do investimento reside na produção indireta, por ser &se o meio de imprimir-se um acréscimo de produtividade à produção. Se insistimos nesse destaque é porque o propósito da melhoria de eficiência, via produção indireta, envolve grande número de variáveis: tempo de duração da produção indireta; custo de produção; custo de financiamento; perspectiva de receita, em comparação com a rentabilidade dos empreendimentos presentes; expectativa da depreciação dos equipamentos; expectativa da obsolescência do processo produtivo; risco do empreendi-

General method of phase analysis for individual multicomponent alloys

Abstract: Construction of a complete phase diagram for a 5- (or higher-) component system is so timeconsuming as to be impractical at present. The usual type of information about the phases present, their compositions, and their amounts can be obtained for a particularC-component alloy by the present method:C is the number of components and may be as large as desired. The alloy is brought to an essentially equilibrium condition at the temperature of interest, and the compositions of the phases are determined by a suitable technique; for example, by electronbeam-microprobe analyses of the quenched specimen. The generalized lever law, in determinant form, is used to determine the amounts of the phases. Repetition of this analysis at a second temperature in the same phase region permits identification of the type of variant reaction (pseudoeutectic, and so forth) that is occurring. For invariant reactions, a technique such as quantitative metallography is employed to determine the amounts of the phases at an early and a late stage in the reaction. The type of reaction (eutectic, quasiperitectic, and so forth) can then be determined. From experimental data on alloy E an estimate can be made of two aspects of the behavior of a neighboring composition, alloy N; 1) liquidus temperature, and 2) invariant reaction. Thermodynamic procedures should permit useful extensions of the present method.

Considerações sobre o conceito de liberdade comunicativa na filosofia habermasiana

Abstract: A liberdade comunicativa constitui um pressuposto essencial da teoria do agir comunicativo, de Habermas. Ela tem a ver com a possibilidade de uma pessoa se posicionar criticamente quanto a pretensoes de validade de um interlocutor, as quais acompanham inevitavelmente exteriorizacoes linguisticas. Este conceito se liga internamente ao de autoria responsavel e de vontade livre. O presente artigo pretende chamar a atencao para a relevância dessa concepcao de liberdade em duas esferas: em primeiro lugar, na area das pesquisas sobre o genoma humano, sobre neuronios e sobre o cerebro humano, etc.; em segundo lugar, nos debates sobre as possibilidades e percalcos de uma nova concepcao de sociedade democratica.