From practice to field:a multi-level model of practice-driven institutional change

This article develops a model of practice-driven institutional change - or change that originates in the everyday work of individuals but results in a shift in field-level logic. In demonstrating how improvisations at work can generate institutional change, we attend to the earliest moments of change, which extant research has neglected; and we contrast existing accounts that focus on active entrepreneurship and the contested nature of change. We outline the specific mechanisms by which change emerges from everyday work, becomes justified, and diffuses within an organization and field, as well as precipitating and enabling dynamics that trigger and condition these mechanisms. © Academy of Management Journal

Forgone, but not forgotten: Toward a theory of forgone professional identities

Through an inductive, qualitative study, I developed a process model of how people deal with professional identities they have forgone by choice or constraint. I show that, when forgone professional identities are linked to unfulfilled values, people look for ways to enact them and retain them in the self-concept. I further identify three strategies that people use to enact foregone professional identities: (1) real enactment (i.e., enacting the forgone identity through real activities and social interactions either at work or during leisure time), (2) imagined enactment (i.e., enacting the forgone identity through imagined activities and interactions, either in an alternate present or in the future), and (3) vicarious enactment (i.e., enacting the forgone identity by observing and imagining close others enacting it and internalizing these experiences). These findings expand our conceptualization of professional identity beyond identities enacted through activities and interactions that are part of formal work roles, and illuminate the key role of imagination and vicarious experiences in identity construction and maintenance

Proximity, knowledge transfer, and innovation in technology-based M&As

This paper presents the findings from a qualitative study on the extent to which three dimensions of proximity-geographic, cognitive, and organizational-impact knowledge transfer and innovation post-M&A. Findings show that the elements of proximity substantially influence both knowledge transfer and innovation although the nature of the impact varies and is influenced by the type of management interventions or lack thereof post-M&A. \ua9 2012 IEEE.Peer reviewed: YesNRC publication: Ye

Multifeed EBG Dual-Band Antenna for Spatial Mission

We present the design of a multibeam reflector antenna fed by a multifeed dual-band electromagnetic band gap (EBG) antenna to achieve a high-gain multispot coverage for space applications. First, we design a dual-band EBG antenna in monofeed configuration. This antenna is composed of double-layer frequency selective surfaces (FSSs) arranged in the longitudinal direction and a square horn as a feed. Then, the same antenna in multifeed configuration is studied, and the results are compared to those obtained in monofeed configuration in order to emphasize the problem of coupling, generally encountered in multifeed configuration. Consequently, filters are used in order to reduce the parasitic interferences and obtain good radiation characteristics. As shown in this paper, the same EBG phase center is obtained in both frequency bands. Finally, we have studied the whole system composed of the offset reflector and the multifeed EBG dual-band antenna. An edge of coverage (EOC) gain higher than 42 dBi and sidelobes levels lower than −18 dBi are obtained over all spots

A simplified methodology for matched filter design with constraints - Filter-antenna subsystem for space application

International audienceA new simplified methodology for the design of microwave cavity filters has been presented. The presented work is based on the optimization of Belevitch polynomials and inspired from the Simplified Real Frequency Technique (SRFT). one can bypass the use of computationally expensive circuit simulation softwares which are used to optimize the lumped element circuit model of the cavity filters. The procedure is applied for the design of filters for a multi-feed filter-antenna subsystem for space application

From solutions to porous film: Influence of the media on fluorescent acridine end-capped polystyrene photophysic properties

International audienceNitroxide-mediated radical polymerization (NMP) was used to synthesize polystyrene (PS) in the presence of N-tert-butyl-N-(1-diethylphosphono-2,2-dimethylpropyl)nitroxide (SG1) as a control agent and the BlocBuilder® alkoxyamine as an initiator. The α-telechelic carboxylic acid PS was further functionalized by the fluorescent 9-aminoacridine moiety (9AA) to synthesize α-functional fluorescent polystyrene (PS-9AA). The 9-aminoacridine end-capped PS was characterized by size exclusion chromatography, two dimensional heteronuclear multiple-bond correlation nuclear magnetic resonance and fluorescence spectroscopy. The PS-9AA α-telechelic polymer was used to prepare fluorescent continuous and porous polymer films via the Breath Figure (BF) method. The fluorescence properties of PS-9AA in solution were compared to the corresponding one in the continuous and porous polymer films

Verification & validation of lifting line α- and Γ-formulations for 3-D planforms under viscous flows

Many adaptations of the Lifting-Line Theory have been developed since its conception to aid in preliminary aerodynamic wing design, but they typically fall into two main formulations, named α- and Γ-formulation, which differ in terms of the control points chordwise lcation and the variable updated during the iterative scheme. This paper assess the advantages and drawbacks of both formulations through the implementation of the respective methods and assessment through standard Verification & Validation procedures. Verification showed that the Γ-method poorly converges for wings with nonstraight quarter-chord lines, while the α-method presents adequate convergence rates and uncertainties for all geometries; it also showed that the Γ-method agrees most with analytic results from the Classic Lifting-Line Theory, indicating that it tends to overpredict wing lift. Validation and comparison to other modern Lifting-Line methods was done for similar geometries, and not only corroborated the poor converge and lift overprediction of the Γ-method, but also showed that the α-method presented the closest results to experimental data for almost all cases tested, concluding that this formulation is typically superior regardless of the wing geometry; these results indicate that the implemented α-method has a greater potential for the extension of the Lifting-Line Theory to more geometrically complex lifting surfaces other than fixed wings with straight quarter-chord lines and wakes constrained to the planform plane