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Isothermal drop calorimeter provides measurements for alpha active, pyrophoric materials
Isothermal drop calorimeter measures the heat content of intensely alpha active and pyrophoric materials in inert atmospheres. It consists of a furnace, calorimeter, and aluminum isothermal jacket contained within an inert-atmosphere glove box, which permits the use of unencapsulated materials without exposing personnel to alpha contamination
Two worlds across a highway
The Government of Pakistan and FAO have put into practice a participatory process that sought to involve as wide a range of stakeholders as possible, with two rounds of
consultations ‘close’ to people in communities and in some cases, actually with poor people and women. This is the relation of one day of these consultations in a little Pakistani village called Chilya. (Pdf contains 5 pages)
Braided and coboundary monoidal categories
In this expository paper, we discuss and compare the notions of braided and
coboundary monoidal categories. Coboundary monoidal categories are analogues of
braided monoidal categories in which the role of the braid group is replaced by
the cactus group. We focus on the categories of representations of quantum
groups and crystals and explain how while the former is a braided monoidal
category, this structure does not pass to the crystal limit. However, the
categories of representations of quantum groups of finite type also possess the
structure of a coboundary category which does behave well in the crystal limit.
We explain this construction and also a recent interpretation of the coboundary
structure using quiver varieties. This geometric viewpoint allows one to show
that the category of crystals is in fact a coboundary monoidal category for
arbitrary symmetrizable Kac-Moody type.Comment: 24 pages; v2: minor typos corrected. To appear in the proceedings of
the conference "Algebras, Representations and Applications" (Lie and Jordan
Algebras, their Representations and Applications - III) in Honour of Prof.
Ivan Shestakov's 60th Birthda
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