Operation of weaving partial Steiner triple systems

We introduce an operation of a kind of product which associates with a partial Steiner triple system another partial Steiner triple system, the starting one being a quotient of the result. We discuss relations of our product to some other product-like constructions and prove some preservation/non-preservation theorems. In particular, we show series of anti-Pasch Steiner triple systems which are obtained that way

Mechanical properties of wool and cotton yarns used in twenty-first century tapestry: preparing for the future by understanding the present

The conservation of historic tapestries is a complex and highly skilled task. Tapestries now being woven will need conservation in years to come. Can we, by understanding the properties of these contemporary works, assist the conservators of the future? The recreation of the Hunt of the Unicorn tapestries being undertaken by the West Dean Tapestry Studio offers a unique opportunity to access the materials being used and to create a body of data on their initial properties. This study uses tensile testing of the warp and weft materials to determine their maximum load at break, extension at maximum load, and specific stress (tenacity). Wool weft yarns from two different sources and of two thicknesses were examined. These wools were dyed ‘in house’ and the effect of the different dyes used was also assessed. These parameters all showed some significant (P < 0.05) differences. Cotton warp yarns of differing thickness and a gold thread were also tested. The comparison of how cotton and wool break demonstrates that when a tapestry is put under sufficient stress the cotton will snap but the wool may only stretch. However, this could often be beyond its recovery range resulting in a failure to return to shape

Type-Directed Weaving of Aspects for Higher-order Functional Languages

Aspect-oriented programming (AOP) has been shown to be a useful model for software development. Special care must be taken when we try to adapt AOP to strongly typed functional languages which come with features like a type inference mechanism, polymorphic types, higher-order functions and type-scoped pointcuts. Our main contribution lies in a seamless integration of these two paradigms through a static weaving process which deals with around advices with type-scoped pointcuts in the presence of higher-order functions. We give a source-level type inference system for a higher-order, polymorphic language coupled with type-scoped pointcuts. The type system ensures that base programs are oblivious to the type of around advices. We present a type-directed translation scheme which resolves all advice applications at static time. The translation removes advice declarations from source programs and produces translated code which is typable in the Hindley-Milner system

Looking Out, Looking In: Contemporary Artists from Morocco

This is the catalogue of the exhibition "Looking Out, Looking In: Contemporary Artists from Morocco" held at Faye G., Jo, and James Stone Gallery 855 Commonwealth Avenue from February 8, 2019 – March 31, 2019. The exhibition is curated by Cynthia Becker, Associate Professor of African Art, Boston University Department of History of Art and Architecture and Nadia Sabri, Professor of Art History and curator, Faculty of Education Sciences, University of Mohammed V in Rabat, Morocco. Participating artists are Hassan Darsi, Wiame Haddad, Hassan Hajjaj, Randa Maroufi, Safaa Mazirh, Lamia Naji, and Nour Eddine Tilsaghani.Looking Out, Looking In: Contemporary Artists from Morocco brings together seven diverse Moroccan photographers and videographers for the first time. Each works in a unique style and comes from a different background, but what links them is their exploration of how seeing is not always equated with knowing. They recognize that the process of looking is a political act and seek to emphasize the ambiguity of meaning contained within the visual. Some artists consider how Moroccan society is looked at by outsiders and confront the historical biases inherent in the colonial gaze. Others imagine a world without borders, making sense of the boundaries that divide nation-states. Some consider aspects of Moroccan culture hidden from public view due to political oppression. Each uses their art to contemplate the moral and emotional experiences of looking in at oneself in response to looking out at the complex social issues that impact Morocco today.The exhibition is co-sponsored with Boston University’s African Studies Center, the Boston University Arts Initiative, the Institute for the Study of Muslim Societies & Civilizations, the Department of History of Art & Architecture. The Boston University Art Galleries programs are supported in part through a grant from the Boston Cultural Council and administered by the Mayor’s Office of Arts and Culture

Evidence of exchange networks: the combs and other worked skeletal material

Significant contribution to the study of skeletal material in the Norse period using large internationally significant assemblage from Norse site in Orkney