Helsinki University of Technology

About: Helsinki University of Technology is a based out in . It is known for research contribution in the topics: Thin film & Vortex. The organization has 8962 authors who have published 20136 publications receiving 723787 citations. The organization is also known as: TKK & Teknillinen korkeakoulu.

The piecewise polynomial collocation method for nonlinear weakly singular Volterra equations

Abstract: Second-kind Volterra integral equations with weakly singular kernels typically have solutions which are nonsmooth near the initial point of the interval of integration. Using an adaptation of the analysis originally developed for nonlinear weakly singular Fredholm integral equations, we present a complete discussion of the optimal (global and local) order of convergence of piecewise polynomial collocation methods on graded grids for nonlinear Volterra integral equations with algebraic or logarithmic singularities in their kernels.

The effect of microvoid size on positron annihilation characteristics and residual resistivity in metals

Abstract: The annihilation characteristics of a positron trapped in spherical clusters of 1., 50 vacancies in Al and Mo are calculated. The results are found to depend sensitively on the void size up to a radius of about 5 A, beyond which the size dependence disappears. The residual resistivity is shown to be nearly independent of the microvoid size during initial stages of vacancy clustering. The sizes of the microvoids in electron irradiated Mo as a function of annealing temperatures are evaluated from recent experimental positron lifetime results.

BI‐isotropic constitutive relations

Abstract: The constitutive relations of general bi-isotropic media, requiring four material parameters, can be written in different ways to describe their electromagnetic behavior. This communication contains a two-way “dictionary” between a proposed formulation of the constitutive relations with three other sets of relations, generalized from relations used for chiral materials.

Design for Value Co-Creation: Exploring Synergies Between Design for Service and Service Logic

Abstract: This paper aims to bridge recent work on Service Logic with practice and research in the Design for Service to explore whether and how human-centered collaborative design approaches could provide a source for interpreting existing service systems and proposing new ones and thus realize a Service Logic in organizations. A comparison is made of existing theoretical backgrounds and frameworks from Service Logic and Design for Service studies that conceptualize core concepts for value co-creation: actors, resources, resource integration, service systems, participation, context, and experience. We find that Service Logic provides a framework for understanding service systems in action by focusing on how actors integrate resources to co-create value for themselves and others, whereas Design for Service provides an approach and tools to explore current service systems as a context to imagine future service systems and how innovation may develop as a result of reconfigurations of resources and actors. Design for Service also provides approaches, competences, and tools that enable involved actors to participate in and be a part of the service system redesign. Design for value co-creation is presented using this model. The paper builds on and extends the Service Logic research first by repositioning service design from a phase of development to Design for Service as an approach to service innovation, centered on understanding and engaging with customers' own value-creating practices. Second, it builds on and extends through discussing the meaning of value co-creation and identifying and distinguishing collaborative approaches for the generation of new resource constellations. In doing so, the collaborative approaches allow for achieving value co-creation in designing.