287 research outputs found
Compactness of Scrap Tyre Rubber Aggregates in Standard Proctor Test
No full textAbstractScrap tyre derived aggregates (TDA) have been used in civil engineering since 1990-ties, mainly in the USA. The material may be used in various forms and sizes – from powder, through granulates, tyre shreds, chips. The TDA applications include: lightweight fills in embankments over soft soils, lightweight backfills behind retaining walls, insulation and drainage layers etc. In most of the works the material needs to be compacted to decrease the void ratio of the aggregate and reduce future settlement. This paper presents a study on compactness of four different fractions of scrap tyre rubber (A: 0.1 – 1mm, B: 0.5 – 2mm, C: 2 – 5mm and D: 10 – 40mm) in the standard Proctor test. The results in the form of dependency of dry and bulk density on water content are compared also with adequate results obtained for a clean uniform medium sand. It turns out that the optimum moisture content can be clearly estimated only in the case of the finest fraction (sample A) and it is equal to about 40%. The variability of dry density is however small – it changes from 0.54 to 0.61g/cm3. Coarser TDAs behave more like self-draining materials – they retain much less water and the maximum moisture content equals to about 18%, 23% and 38% in case of tyre chips (D), 2 – 5mm grains (C) and 0.5 – 2mm grains (B) respectively. The dry densities for samples B, C and D possible to be obtained with standard Proctor energy have been estimated as: 0.61, 0.60 and 0.59g/cm3 respectively
Deborah Morton and Two Students in the Library, Hersey Hall, Westbrook Junior College, 1930
No full textWestbrook Junior College\u27s Deborah Nichols Morton (1857-1947) stands before a Hersey Hall Library shelf in this 1930 glossy, black and white photograph, which also shows two students seated at a study table in the back room of the Library. An outstanding and civic minded educator, Miss Morton was serving as librarian in the 1930s.
In 1934 this small and cramped Library in Hersey Hall would be revamped and expanded under the direction of Dr. Milton D. Proctor who arrived in 1933 to serve as president of Westbrook Seminary and Junior College.https://dune.une.edu/wchc_photos_libraryhersey/1003/thumbnail.jp
Interview of author Tenea D. Johnson at the Zora Neale Hurston Festival in Eatonville, Florida
No full textTenea D. Johnson, award winning author and founder of Progress By Design, is interviewed by Grace Chun, project coordinator at University of Florida Samuel Proctor Oral History Program, as part of the Zora Neale Hurston Festival in Eatonville, Florida. Tenea speaks about her work, afrofuturism, and how her stories and songs create worlds to examine big questions. She defines speculative fiction anything that doesn't abide by the rules, that is not based in reality. Tenea says she hopes that afrofuturism and Black speculative fiction will become a greater force than just entertainment and that Zora Neale Hurston's ethnographies influenced her the most as she demonstrated confidence not out of ego but of skill, exemplifying bravery and openness
Differences in Radiative Forcing, Not Sensitivity, Explain Differences in Summertime Land Temperature Variance Change Between CMIP5 and CMIP6
No full text© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Chan, D., Rigden, A., Proctor, J., Chan, P. W., & Huybers, P. Differences in radiative forcing, not sensitivity, explain differences in summertime land temperature variance change between CMIP5 and CMIP6. Earth’s Future, 10(2), (2022): e2021EF002402, https://doi.org/10.1029/2021EF002402.How summertime temperature variability will change with warming has important implications for climate adaptation and mitigation. CMIP5 simulations indicate a compound risk of extreme hot temperatures in western Europe from both warming and increasing temperature variance. CMIP6 simulations, however, indicate only a moderate increase in temperature variance that does not covary with warming. To explore this intergenerational discrepancy in CMIP results, we decompose changes in monthly temperature variance into those arising from changes in sensitivity to forcing and changes in forcing variance. Across models, sensitivity increases with local warming in both CMIP5 and CMIP6 at an average rate of 5.7 ([3.7, 7.9]; 95% c.i.) × 10−3°C per W m−2 per °C warming. We use a simple model of moist surface energetics to explain increased sensitivity as a consequence of greater atmospheric demand (∼70%) and drier soil (∼40%) that is partially offset by the Planck feedback (∼−10%). Conversely, forcing variance is stable in CMIP5 but decreases with warming in CMIP6 at an average rate of −21 ([−28, −15]; 95% c.i.) W2 m−4 per °C warming. We examine scaling relationships with mean cloud fraction and find that mean forcing variance decreases with decreasing cloud fraction at twice the rate in CMIP6 than CMIP5. The stability of CMIP6 temperature variance is, thus, a consequence of offsetting changes in sensitivity and forcing variance. Further work to determine which models and generations of CMIP simulations better represent changes in cloud radiative forcing is important for assessing risks associated with increased temperature variance.This study was supported by the Harvard Global Institute and NSF (Award 1903657). D. Chan was also supported by the Woods Hole Oceanographic Institute Weston Howland Jr. Postdoctoral Fellowship
Getting to the Core of the Women’s Curriculum—It’s Time to Change the Way We Train Our Fellows
No full textAgnotology
No full textRobert Proctor e Ian Bolin acuñaron el término agnotología para designar el estudio de la ignorancia. Este escrito propone superar la visión de la ignorancia como un vacío que puede ser llenado por el conocimiento e invita a pensar en las formas en que hoy se produce, en forma premeditada y estructural: por negligencia, miopía, secreto o supresión. El autor muestra que la creación deliberada de la ignorancia es una estrategia para engañar y sembrar dudas sobre los hechos observados y sobre el conocimiento científico, tomando como ejemplos el papel de los secretos comerciales, la actividad de las tabacaleras para negar la relación causal entre el consumo de cigarrillos y el cáncer y el papel del secreto militar. Por último analiza algunos casos en que la ignorancia es una expresión de valores morales, como la prohibición, en algunas universidades, de investigaciones cuyo único fin es el afán de lucro y, en algunas revistas científicas, de publicar trabajos financiados por ciertas fuentes, así como el rechazo de ciertas tecnologías por razones intelectuales y morales bien fundadas.Robert Proctor and Ian Bolin coined the term agnotology to designate the study of ignorance. This paper proposes to overcome the vision of ignorance as a void that can be filled by knowledge and invites us to think about the ways in which it is produced today, in a premeditated and structural way: through negligence, myopia, secrecy or suppression. The author shows that the deliberate creation of ignorance is a strategy to compromise and sow doubts about the observed facts and about scientific knowledge, taking as examples the role of trade secrets, the activity of tobacco companies to deny the causal relationship between the cigarette smoking and cancer and the role of military secret. Finally, some cases in ignorance is an expression of moral values, such as the prohibition, in some universities, of research whose sole purpose is the profit motive and, in some scientific journals, of publishing works financed by certain sources, as well as the rejection of certain technologies for well-founded intellectual and moral reasons
Agnotologia
No full textRobert Proctor and Ian Bolin coined the term agnotology to designate the study of ignorance. This paper proposes to overcome the vision of ignorance as a void that can be filled by knowledge and invites us to think about the ways in which it is produced today, in a premeditated and structural way: through negligence, myopia, secrecy or suppression. The author shows that the deliberate creation of ignorance is a strategy to compromise and sow doubts about the observed facts and about scientific knowledge, taking as examples the role of trade secrets, the activity of tobacco companies to deny the causal relationship between the cigarette smoking and cancer and the role of military secret. Finally, some cases in ignorance is an expression of moral values, such as the prohibition, in some universities, of research whose sole purpose is the profit motive and, in some scientific journals, of publishing works financed by certain sources, as well as the rejection of certain technologies for well-founded intellectual and moral reasons.Robert Proctor e Ian Bolin acuñaron el término agnotología para designar el estudio de la ignorancia. Este escrito propone superar la visión de la ignorancia como un vacío que puede ser llenado por el conocimiento e invita a pensar en las formas en que hoy se produce, en forma premeditada y estructural: por negligencia, miopía, secreto o supresión. El autor muestra que la creación deliberada de la ignorancia es una estrategia para engañar y sembrar dudas sobre los hechos observados y sobre el conocimiento científico, tomando como ejemplos el papel de los secretos comerciales, la actividad de las tabacaleras para negar la relación causal entre el consumo de cigarrillos y el cáncer y el papel del secreto militar. Por último analiza algunos casos en que la ignorancia es una expresión de valores morales, como la prohibición, en algunas universidades, de investigaciones cuyo único fin es el afán de lucro y, en algunas revistas científicas, de publicar trabajos financiados por ciertas fuentes, así como el rechazo de ciertas tecnologías por razones intelectuales y morales bien fundadas.Robert Proctor e Ian Bolin cunharam o termo agnotologia para designar o estudo da ignorância. Este artigo propõe-se a superar a visão da ignorância como um vazio que pode ser preenchido pelo conhecimento e nos convida a pensar sobre as maneiras pelas quais é produzido hoje, de maneira premeditada e estrutural: por negligência, miopia, sigilo ou supressão. O autor mostra que a criação deliberada da ignorância é uma estratégia para enganar e semear dúvidas sobre os fatos observados e sobre o conhecimento científico, tomando como exemplo o papel dos segredos comerciais, a atividade das empresas de tabaco em negar a relação causal entre os tabagismo e câncer e o papel do segredo militar. Por fim, analisa alguns casos em que a ignorância é uma expressão de valores morais, como a proibição, em algumas universidades, de pesquisas cujo único objetivo é o lucro e, em algumas revistas científicas, a publicação de obras financiadas por determinadas fontes, como a rejeição de certas tecnologias por razões intelectuais e morais bem fundamentadas
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