13,919 research outputs found
From the Drinfeld realization to the Drinfeld-Jimbo presentation of affine quantum algebras: the injectivity
In this paper the surjective homomorphism from the Drinfeld realization to
the Drinfeld and Jimbo presentation of affine quantum algebras is proved to be
injective. A consequence of the arguments used in the paper is the triangular
decomposition of the Drinfeld realization of affine quantum algebras also in
the twisted case. A presentation of the affine Kac-Moody algebras in terms of
the "Drinfeld generators" is also provided
Unusual conversations: A reflection on the mechanics of internationally engaged public scholarship
This article analyses the civic engagement pathways of researchers from the Asia-Pacific and the United States in an effort to see how the principles of what American  scholars consider publicly engaged research and creative practice are being enacted in research sites across the globe. The purpose of this ongoing project is to focus on finding ways of connecting American scholars with a network of higher education and research institutions that hold a commitment and passion for social responsibility and civic engagement as it impacts education, research and service for community development overseas. The narrative includes the voices and perspectives of colleagues dedicated to engaged scholarship from across the new region in which I work (the Asia-Pacific), alongside the voices of some of Imagining Americaâs (IA) 2014 National Conference participants. These conversations serve as a critical reflection on the mechanics of doing public scholarship overseas and frame a new model of internationally engaged scholarship.Keywords: Internationally engaged public scholarship, unusual conversation
Labour regulation, corporate governance and varieties of capitalism
The literature aimed at exploring labor regulation and cross-country comparisons has left partly unexplored two major points: the first is the influence of employees within managerial processes, through the channel of employee representation at firm level. The second point concerns potential complementarities or substitutions between patterns of ownership or shareholder protection and labour regulation. The paper offers a critical overview of some selected studies that have started at filling these gaps by considering labour institutions for their influence on the âbalanceâ of power inside the firm, between owners, management, and employees. Firstly, it examines the literature which gives a central importance to the effects of legal origins on labour regulation and labour market outcomes. Secondly, it reviews the studies which focus on informal rules and de-facto practices and favour a stakeholder approach. A particular concern is paid to the overall consequences of the different institutional setups in the perspective of the âvarieties of capitalismâ, in which systems of labour regulation exert their function by strategical interactions with other institutions. Finally, it presents recent theoretical and empirical studies centring on employee investments in firm-specific human capital and on institutional devices which have the effect of tying the fortunes of the employee together with those of the firm. In the varieties of capitalism characterised by general skills and patterns of radical innovation, it is emphasized the internal governance exerted by âcritical employeesâ. In economies with firm and industry specific skills, cooperation of employees with management in more shareholder value oriented firm (ânegotiated shareholder systemâ) are the more successful roads.Stakeholders, Corporate Governance, Varieties of Capitalism.
Alexander invariants of ribbon tangles and planar algebras
Ribbon tangles are proper embeddings of tori and cylinders in the
-ball~, "bounding" -manifolds with only ribbon disks as
singularities. We construct an Alexander invariant of ribbon
tangles equipped with a representation of the fundamental group of their
exterior in a free abelian group . This invariant induces a functor in a
certain category of tangles, which restricts to the exterior
powers of Burau-Gassner representation for ribbon braids, that are analogous to
usual braids in this context. We define a circuit algebra over
the operad of smooth cobordisms, inspired by diagrammatic planar algebras
introduced by Jones, and prove that the invariant commutes with
the compositions in this algebra. On the other hand, ribbon tangles admit
diagrammatic representations, throught welded diagrams. We give a simple
combinatorial description of and of the algebra ,
and observe that our construction is a topological incarnation of the Alexander
invariant of Archibald. When restricted to diagrams without virtual crossings,
provides a purely local description of the usual Alexander
poynomial of links, and extends the construction by Bigelow, Cattabriga and the
second author
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