Acrylonitrile-butadiene-styrene toughened nylon 6: The influences of compatibilizer on morphology and impact properties

Polymer alloys have been used as an alternative to obtain polymeric materials with unique physical properties. Generally, the polymer mixture is incompatible, which makes it necessary to use a compatibilizer to improve the interracial adhesion. Nylon 6 (PA6) is an attractive polymer to use in engineering applications, but it has processing instability and relatively low notched impact strength. In this study, the acrylonitrile-butadiene-styrene (ABS) triblock copolymer was used as an impact modifier for PA6. Poly(methyl methacrylate-co-maleic anyhydride) (MMA-MA) and poly(methyl methacrylate-co-maleic methacrylate) (MMA-GMA) were used as compatibilizers for this blend. The morphology and impact strength of the blends were evaluated as a function of blend composition and the presence of compatibilizers. The blends compatibilized with maleated copolymer exhibited an impact strength up to 800 J/m and a morphology with ABS domains more efi8ciently dispersed. Moderate amounts of MA functionality in the compatibilizer (∼5%) and small amounts of compatibilizer in the blend (∼5%) appear sufficient to improve the impact properties and ABS dispersion. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87.

Relationship between plasma and red blood cell concentrations of quinine in Brazilian children with uncomplicated Plasmodium falciparummalaria on oral therapy

Neste estudo foi determinada a relação entre as concentrações plasmáticas e eritrocitárias de quinina em crianças com malária falciparum não complicada, oriundas de área endêmica da Região Amazônica. A quinina foi detrminada por cromatografia líquida de alta eficiência. No estado de equilíbrio, a relação foi 1,89 ± 1,25 variando de 1,05 a 2,34. Estes resultados demonstraram que a quinina não se concentra nos eritrócitos das crianças e caracterizaram a ausência de diferença racial nesta relação.

Mary E. Frayser Papers - Accession 1

The Mary E. Frayser Papers consists of correspondence, speeches, reports, clippings, minutes, histories, family histories, constitutions and bylaws, membership lists, program notes, photographs, and other papers, relating to her work with the South Carolina Extension Service (1912-1940) Winthrop College, her involvement with the South Carolina Council for the Common Good (1935-1952), the South Carolina Federation of Women’s Clubs (1926-1952), the South Carolina Status of Women Conference (1945-1952), the South Carolina Division of the American Association of University Women (AAUW) (1929, 1935-1949), the South Carolina Interracial Institute (1938-1942), the South Carolina Division of the Southern Regional Council (1944-1951), and the South Carolina Conference of Social Work (1936-1967). There are also papers relating to Frayser’s efforts to promote social and economic legislation and participation by women in public affairs and her interest in libraries and work in the movement for the support of public libraries in South Carolina (1925-1968). Correspondents included G.H. Aault, Evan Chesterman, Wil Lou Gray, Sarah Hughes, Christine South Gee, and Maude Massey Rogers. This collection is a good source of women’s club activities in the twentieth century. Important areas of research would include the way club activity affected social and economic legislation in the state and the various forces involved in the movement for state tax supported libraries. While the papers do range from 1841 to 1953, the greater bulk of the papers extend from the early 1930s to about 1947. Since the work of the various women's club organizations were so inter-related, a researcher working with the papers of a particular organization for a particular time span should consider the Frayser papers of all other organizations. The related papers for the “Correspondence and Related Papers” series for particular organizations are generally similar and include: memoranda, outlines, reports, resolutions, minutes, etc. Additional Frayser information can be found by referring to the Winthrop University Archives (official records).

Il teatro e Derek Walcott. Prospettive postcoloniali e multiculturali

This thesis explores the function of the theatre in Derek Walcott's literary achievements. Focusing on the semiotic theories that characterize the study of drama as a literary text and as a staged text, the initial approach aims at creating a relationship between semiotics and postcolonial theories. In particular Pavis's concept of intercultural semiotics and Peter Brook's innovative visions about the regenerative function of the space of the theatre represent a useful theoretical basis to consider the specificity of postcolonial theatre as an innovative space, where new cultural meanings emerge. Derek Walcott's dramatic production is studied according to this approach, in order to be defined as a new hybrid, syncretic and multicultural space. After considering the development of drama from a postcolonial and Caribbean perspective, this study begins with an insight into Walcott's views on theatre, taking into consideration his linguistic depth, linked to the European tradition, but also his strong concern with the Caribbean public's cultural needs. The double tension characterizing Walcott's cultural identity as well as his art represents an essential element to analyse his dramatic texts. With an ambivalent approach, which takes into consideration language and performance, this thesis offers an insight into Walcott's plays to detect their postcolonial and multicultural elements. The analysis of the different texts are divided into two chapters (third and fourth). The third chapters - mainly focused on postcolonial themes - explores issues such as language, identity and space, whereas the fourth chapter centers on multiculturalism in text and performance. Dealing with interracial interactions, issues like re-writing classical texts and the manipulation of personal and collective memory as a way to re- establish new historical perspectives, the last part of the thesis aims at demonstrating the idea that Walcott has created a new space in the theatre made by the harmonic fusion of different and opposed cultural elements, which are visible in the literary as well as in the staged text. The textual perspective of Walcott's drama fits into Pavis's definition of intercultural semiotics, as the faithful representation of a multicultural creole society: that of the West Indies.

For Safety’s Sake: A Case Study of School Security Efforts and Their Impact on Education Reform

Several studies have shown that the need to create safe and orderly schools has increasingly been addressed in a manner that disconnects these priorities from broader concerns related to student success, school culture, and child development. In this paper, we explore the consequences of expanding security procedures in response to an incident involving interracial conflict at an urban high school in the United States. We offer this case study to demonstrate how the primacy placed on safety and security resulted in the neglect of other important educational goals, such as academic engagement and a positive school culture. Through an analysis of observational, interview, focus group, and survey data, we show that while it is essential for schools to take measures that ensure the safety of students and staff, it is equally important for safety to be recognized as part of a larger set of goals that schools must concurrently pursue in order to meet the educational and developmental needs of the students they serve.

What initiates speciation in passion-vine butterflies?

Studies of the continuum between geographic races and species provide the clearest insights into the causes of speciation. Here we report on mate choice and hybrid viability experiments in a pair of warningly colored butterflies, Heliconius erato and Heliconius himera, that maintain their genetic integrity in the face of hybridization. Hybrid sterility and inviability have been unimportant in the early stages of speciation of these two Heliconius. We find no evidence of reduced fecundity, egg hatch, or larval survival nor increases in developmental time in three generations of hybrid crosses. Instead, speciation in this pair appears to have been catalyzed by the association of strong mating preferences with divergence in warning coloration and ecology. In mate choice experiments, matings between the two species are a tenth as likely as matings within species. F1 hybrids of both sexes mate frequently with both pure forms. However, male F1 progeny from crosses between H. himera mothers and H. erato fathers have somewhat reduced mating success. The strong barrier to gene flow provided by divergence in mate preference is probably enhanced by frequency-dependent predation against hybrids similar to the type known to occur across interracial hybrid zones of H. erato. In addition, the transition between this pair falls at the boundary between wet and dry forest, and rare hybrids may also be selected against because they are poorly adapted to either biotope. These results add to a growing body of evidence that challenge the importance of genomic incompatibilities in the earliest stages of speciation.

Estigma social y adopción internacional en España. ¿Es la familia adoptiva un modelo familiar menos «auténtico» que los basados en lazos biológicos?

En España, el fenómeno de las adopciones internacionales irrumpe en la década de 1990. En 2004, se convirtió en el segundo país del mundo que las llevaba a cabo. Con el objetivo de incrementar el conocimiento sociológico sobre la familia adoptiva internacional española, se realizó la encuesta a través de web titulada Las familias adoptivas y sus estilos de vida. A partir de las respuestas ofrecidas por 230 madres y padres adoptivos, se dibuja el perfil sociodemográfico de sus hogares. Estos se caracterizarían por contar con progenitores con elevado nivel formativo, no adscritos a ninguna religión, que defienden políticas de izquierdas y que comparten un sistema de valores posmodernos respecto a la institución familiar. La identificación de la estructura doméstica según su tipo de alianza (biparental o monoparental) y su tipo de filiación (adoptiva o mixta) nos permite situar a la adopción contemporánea como una opción de filiación elegida y no, exclusivamente, como alternativa ante la imposibilidad de tener hijos biológicos. Adicionalmente, los resultados arrojados por la encuesta nos permiten adentrarnos en uno de los aspectos menos abordados en el estudio sociológico de la familia adoptiva: el papel de las actitudes sociales hacia la adopción y su impacto en aquella. La mayoría de los encuestados perciben el estigma social del que es objeto su familia adoptiva, pues, desde su punto de vista, la sociedad las considera como una forma de hogar menos satisfactoria que la basada en lazos biológicos.

Race at the Interface: Rendering Blackness on WorldStarHipHop.com

WorldStarHipHop.com (WSHH) is an online video aggregating website that describes itself as “the premiere online hip hop destination” and a home for “urban media.” Yet, browsing through the site provides little clarity on what constitutes a hip-hop video or urban Internet space because of the disparate video content, the actual racial diversity of the performers, and the website’s generic design. As a result, WSHH’s taglines make a strange claim about the current state of the black musical tradition. Through close readings of the site, this article considers the architecture of this space of interracial exchange and identifies the interface as an example of Modernist architectural simplicity. I argue WSHH’s modular design is flexible enough to include non-black bodies, while remaining a black “urban” space. Thus, the site’s straightforward architecture paradoxically becomes the scaffolding of a much more complex, de-corporealized, and “shareable” blackness.

Dreams for Dead Bodies : Blackness, Labor, and the Corpus of American Detective Fiction /

Robinson argues that the detective genre’s lineage lies in experimental works on the margins of what we recognize as classical detective fiction today. Authors like Edgar Allan Poe, Mark Twain, Pauline Hopkins, and Rudolph Fisher drew on detective fiction’s puzzle-elements to wrestle with complicated questions about race and labor in the U.S.