308 research outputs found

    Imprinting, honeymooning, or maturing: Testing three theories of how interfirm social bonding impacts suppliers’ allocations of resources to business customers

    Get PDF
    In business markets, does strength of social bonds that a supplier perceives with a specific customer influence the supplier’s allocations of resources relative to other customers? If social bonding does uniquely impact supplier allocation of resources to customers, does the impact vary by relationship duration? Relationship marketing and Homans’ framework for social behavior are the theoretical bases for the study, which uses survey data to examine three alternative models that indicate how suppliers’ perceptions of social bonds with customers influence the suppliers’ allocations of resources over time. Analysis of data from sales and marketing managers confirms that two of these models, the imprinting theory and the maturity theory, are relevant. The findings indicate that relationship managers need to take into account the clear effect that creation of strong social bonds in buyer–seller relationships, as distinct from financial bonds, has on the way in which suppliers allocate resources to those relationships and how relationship duration affects the way in which they do so. The study strengthens the argument, on a strong theoretical base, to adopt a collaborative, as opposed to a transactional, approach to buyer–seller relationships

    Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results

    Get PDF
    The chromosphere is a thin layer of the solar atmosphere that bridges the relatively cool photosphere and the intensely heated transition region and corona. Compressible and incompressible waves propagating through the chromosphere can supply significant amounts of energy to the interface region and corona. In recent years an abundance of high-resolution observations from state-of-the-art facilities have provided new and exciting ways of disentangling the characteristics of oscillatory phenomena propagating through the dynamic chromosphere. Coupled with rapid advancements in magnetohydrodynamic wave theory, we are now in an ideal position to thoroughly investigate the role waves play in supplying energy to sustain chromospheric and coronal heating. Here, we review the recent progress made in characterising, categorising and interpreting oscillations manifesting in the solar chromosphere, with an impetus placed on their intrinsic energetics.Comment: 48 pages, 25 figures, accepted into Space Science Review

    Integrated motor drives: state of the art and future trends

    Get PDF
    With increased need for high power density, high efficiency and high temperature capabilities in Aerospace and Automotive applications, Integrated Motor Drives (IMD) offers a potential solution. However, close physical integration of the converter and the machine may also lead to an increase in components temperature. This requires careful mechanical, structural and thermal analysis; and design of the IMD system. This paper reviews existing IMD technologies and their thermal effects on the IMD system. The effects of the power electronics (PE) position on the IMD system and its respective thermal management concepts are also investigated. The challenges faced in designing and manufacturing of an IMD along with the mechanical and structural impacts of close physical integration is also discussed and potential solutions are provided. Potential converter topologies for an IMD like the Matrix converter, 2-level Bridge, 3-level NPC and Multiphase full bridge converters are also reviewed. Wide band gap devices like SiC and GaN and their packaging in power modules for IMDs are also discussed. Power modules components and packaging technologies are also presented

    Calculations of Neutron Time-Energy Distributions in Heavy Moderators

    Get PDF
    The article of record as published may be found at http://dx.doi.org/10.13182/NSE70-A19333The task of making detailed neutronics calculations for heavy moderating isotopes has always been a most difficult problem for a variety of reasons. Consider, for instance, the problem of calculating the time and energy (or lethargy) dependent neutron density N(E,t) that develops in a homogeneous moderator during and following the introduction of a source, S(E,t) in the MeV range. Monte Carlo techniques are very impractical because of the large number of collisions required per history. The usual multi group stepping matrix techniques 1 are inapplicable for at least two reasons: (a) inordinately large matrices are required when collision energy losses are small and (b) scattering through the inelastic region may take but a microsecond while moderation to thermal energies may require times of the order of a millisecond, thus making it virtually impossible to choose a suitable time step upon which to define the matrix
    corecore