Deformation of Nb-W single crystals: Athermal solid solution strengthening

The athermal component of the flow stress of single crystals of niobium and four substitutional solid solution strengthened Nb-W alloys (1, 3, 6, and 15 at. pct) has been measured. The magnitude of the athermal stress was obtained by the method utilizing the temperature dependence of the flow stress and by a stress relaxation method. The agreement between these two methods is good. Athermal strengthening is a linear function of concentration over most of the composition range. No current athermal hardening theory is completely consistent with the experimental results. © 1971 The Metallurgical Society of American Institute of Mining

Donald Pierson e a escola sociológica de Chicago no Brasil: os estudos urbanos na cidade de São Paulo (1935-1950) Donald Pierson and the Sociological School of Chicago in Brazil: urban studies in the city of São Paulo (1935-1950)

O artigo, em termos amplos, trata da influência de Donald Pierson, formado na Escola Sociológica de Chicago, que teve maior repercussão na pesquisa urbana no Brasil, nos anos 30 e 50, tanto na Sociologia quanto na Antropologia, na cidade de São Paulo. A pesquisa urbana no Brasil tanto sociológica quanto antropológica teve referenciais teóricos que deixaram sua marcas nos trabalhos da época. No meu argumento, se pensarmos nos campos científicos da Antropologia e da Sociologia Urbana no Brasil, uma das tendências teóricas em um momento histórico e teórico foi a Escola Sociológica de Chicago. Um resgate de pesquisas precursoras de estudos urbanos na cidade de São Paulo poderiam comprovar a influência da Escola de Chicago. Apesar de serem pesquisas isoladas, enfatizaram fortemente questões propriamente urbanas. Seria arriscado defini-las nesta época como uma Sociologia Urbana propriamente dita, em São Paulo. O motivo de trazê-las é demonstrar que realmente foram um antecedente dos estudos urbanos no Brasil, entre 1935-1950. Assim, posso dizer que a Sociologia da Escola de Chicago teve influência em três campos no Brasil: a) relações raciais (negros, brancos e imigrantes), b) estudos de comunidade (pequenas cidades rurais) e c) estudos na cidade (principalmente São Paulo). Portanto, estou pensando a cidade de São Paulo como um cenário em termos gerais, como uma agenda de pesquisa institucional nos anos 35-50. Entre as poucas e modestas pesquisas de Sociologia na cidade de São Paulo tomada como objeto de estudo, foi feita uma etnografia na cidade ou uma etnografia urbana diferente dos clássicos estudos de comunidades em pequenas cidades rurais. Temos inicialmente oito trabalhos que foram publicados principalmente como artigos em revistas, sendo o objeto de pesquisa alguns bairros da cidade ou em outras cidades. O ponto central do artigo está na ampla bibliografia que foi encontrada, e apresentada no final do texto sobre a influência da Escola de Chicago e sua repercussão no Brasil.<br>This paper is an overview of the influence of Donald Pierson, formed in the Sociological School of Chicago, which had more repercussion on urban research in Brazil in the 1930s and 1950s, both within Sociology and Anthropology, in the city of São Paulo. Urban research in Brazil - both sociological and anthropological - had theoretical references that left their marks on the works of that time. According to my argument, regarding the scientific fields of anthropology and urban Sociology in Brazil, one of the theoretical trends in a certain historical and theoretical context was the Sociological School of Chicago. Revisiting pioneer urban studies in São Paulo could assert the influence of the School of Chicago. In spite of being isolated studies, they have strongly stressed properly urban issues. It would be risky to define them these days as Urban Sociology in its own right, in São Paulo. The reason for bringing them up is to demonstrate that they really represented antecedents to urban studies in Brazil between 1035-1950. Therefore, I can say that the sociology of the School of Chicago had its impact on three fields in Brazil: a) racial relations (blacks, whites, and immigrants); b) community studies (small rural towns); and c) studies in the city (especially in São Paulo). Therefore, I think of the city of São Paulo as a scenario in general terms, as an agenda for institutional research in 1935-1950. Among the few and modest sociology studies having the city of São Paulo as their object, an ethnography of the city or urban ethnography was conducted that was different from classic studies on communities or small rural towns. Initially, we have eight works published mainly as journal articles, and their research object was some neighborhoods in São Paulo or other cities. The main feature of the article is the extensive bibliography found and presented at the end of the text, about the impact of the Scholl of Chicago and its repercussion in Brazil

Contributions to arachnid systematics in honor of Willis J. Gertsch, on the occasion of his seventy-fifth birthday. Bulletin of the AMNH ; v. 170, article 1

270 p., [1] leaf of plates : ill. (some col.), maps, ports. ; 26 cm."Scientific publications of Willis J. Gertsch": p. 11-14.Includes bibliographical references and author index.A new species of Mastigoproctus (Thelyphonidae), the first record of Uropygida from Costa Rica / Carlos E. Valerio -- On the Cryptocellus centralis group (Arachnida, Ricinulei) / Norman I. Platnick and Mohammad U. Shadab -- A new genus of troglobitic scorpion from Mexico (Chactoidea, Megacorminae) / Oscar F. Francke -- A new Bothriurus from Bolivia (Scorpiones, Bothriuridae) / Emilio A. Maury -- A study of the syntypes of Diplocentrus keyserlingii (Diplocentridae) / Herbert L. Stahnke -- On Liphistius desultor Schiödte (Araneae, Liphistiidae) / John A. Murphy and Norman I. Platnick -- Three new mygalomorph spiders (Dipluridae, Masteriinae) from Colombia / Robert J. Raven -- The mygalomorph spider genus Microhexura (Araneae, Dipluridae) / Frederick A. Coyle -- Two new species of the mygalomorph spider genus Neocteniza (Araneae, Actinopodidae) / Norman I. Platnick and Mohammad U. Shadab -- Spitting spiders (Araneae, Scytodidae, Scytodes) from Central America / Carlos E. Valerio -- Studies on the Pholcidae. 1, Notes on the genera Artema and Physocyclus / Paolo Marcello Brignoli -- A new genus of spider (Agelenidae) from California exhibiting a third type of leg autospasy / Vincent D. Roth -- Classification of two North American species of Pirata, with a description of a new genus (Araneae, Lycosidae) / Charles D. Dondale and James H. Redner -- Studies on species of Holarctic Pardosa groups (Araneae, Lycosidae). 2, Redescriptions of Pardosa modica (Blackwall), Pardosa labradorensis (Thorell), and Pardosa sinistra (Thorell) / Torbjörn Kronestedt -- A revision of the nigra group of the genus Pardosa in North America (Araneae, Lycosidae) / Donald C. Lowrie and Charles D. Dondale -- The Neotropical spider genera Architis and Staberius (Pisauridae) / James E. Carico -- A new species of Trechalea (Pisauridae) from North America / James E. Carico and Edwin W. Minch -- The Ctenidae of temperate zone North America / William B. Peck -- Color variation in two species of Castianeira (Araneae, Clubionidae) / Jonathan Reiskind -- A new genus of the spider family Gnaphosidae (Arachnida, Araneae) / Norman I. Platnick and Mohammad U. Shadab -- On the spider genus Eilica (Araneae, Gnaphosidae) / Norman I. Platnick and Mohammad U. Shadab -- New species and records of Neotropical Gnaphosidae (Arachnida, Araneae) / Norman I. Platnick and Mohammad U. Shadab -- A revision of the genus Habrocestum (Araneae, Salticidae) in North America / David B. Richman -- A revision of the spider genus Paradamoetas (Araneae, Salticidae) / Bruce Cutler -- Three new species of Salticidae (Araneae) / María Elena Galiano -- New Central and South American Uloboridae (Arachnida, Araneae) / Brent D. Opell -- The Nearctic species of Oreonetides (Araneae, Linyphiidae) / P.J. Van Helsdingen -- The erigonine spiders of North America. Part 5, The genus Satilatlas (Araneae, Linyphiidae) / A.F. Millidge -- More on the genus Araneus from North America / Herbert W. Levi -- Structure of the male palpal organ in Mimetus, Ero, and Gelanor (Araneae, Mimetidae) / William A. Shear -- A textricellid spider from Chile (Araneae, Textricellidae) / Raymond R. Forster and Norman I. Platnick