The paper presents a field study aimed at identifying and analyzing the role of boundary artifacts in cross-organization virtual communities of practice (CoP). Our analysis is informed by a recent case study in vacation package assembly (VPA), which is defined as the distributed collective practice carried out by members of a boundary-spanning virtual alliance inhabiting a ‘common’ information ...

Expression of Hox genes is tightly regulated in spatial and temporal domains. Evx2 is located next to Hoxd13 within 8 kb on the opposite DNA strand. Early in development, the pattern of Hoxd13 expression resembles that of Evx2 in limb and genital buds. After 10 dpc, however, Evx2 begins to be expressed in CNS as well. We analyzed the region responsible for these differences using ES cell techni...

We study gauge fields of arbitrary spin in de Sitter space. These include YangMills fields and gravitons, as well as the higher-spin fields of Vasiliev theory. We focus on antipodally symmetric solutions to the field equations, i.e. ones that live on “elliptic” de Sitter space dS4/Z2. For free fields, we find spanning sets of such solutions, including boundary-to-bulk propagators. We find that ...

We define a minimization problem for paths on planar graphs that, on the honeycomb lattice, is equivalent to the exploration path of the critical site percolation and than has the same scaling limit of SLE6. We numerically study this model (testing several SLE properties on other lattices and with different boundary conditions) and state it in terms of spanning trees. This statement of the prob...

In this paper, we focus on the representation of a divergence-free vector field, defined, on a connected nonsimply connected domain Ω ⊂ R3 with a connected boundary Γ, by its curl and its normal component on the boundary. The considered problem is discretized with H(curl)and H(div)-conforming finite elements. In order to ensure the uniqueness of the vector potential, we propose a spanning tree ...

This paper reports a case study of a Community of Practice (CoP) of tertiary educators in information technology (IT), who seek ways to obtain adequate IT support to match their particular work environment. A facilitated workshop sought to bring members of the CoP and a key representative of the central IT department together with the aim of creating common ground for improved communication and...

Evidence for a major extinction of insect herbivores is provided by presence-absence data for 51 plant-insect associations on 13,441 fossil plant specimens, spanning the Cretaceous/Paleogene boundary in southwestern North Dakota. The most specialized associations, which were diverse and abundant during the latest Cretaceous, almost disappeared at the boundary and failed to recover in younger st...