2,369 research outputs found
Mission Effectiveness and Social Entrepreneurship: Theoretical insights and case-study evidence from three Christian charities in England
This research thesis examines mission effectiveness within three cases of Christian charities in England. It does so within the context of social entrepreneurship, and is occasioned by an attempt to facilitate social service capacity building in order to meet increasing social needs during a period of decreasing government funding. The research evaluates mission effectiveness through the lens of two managerial theories – Resource Based Theory (RBT) and Dynamic Capabilities Theory (DCT). Accordingly, three key objectives underpin this research: to evaluate RBT and DCT for social entrepreneurship in charities, to evaluate the relevant case study evidence and, consequent to an analysis and evaluation of that evidence, to develop/present an appropriately customised theory of mission effectiveness primarily for application within Christian social action charities.
RBT and DCT theoretical and empirical literatures provide several insights into the optimisation of organisational resources and capabilities. An analysis of this literature enables two dimensions to emerge - performance and scalability. These dimensions are explored through six themes: business services, governance, resource investment, collaboration, social enterprise and growth. However, little engagement of these two theories (both developed for and within the For-Profit sector) in the charities (Not-for-Profit) sector is observed. This gap in the literature both provokes and justifies the research. Given that a key objective of the research is to develop a sectorally customised theory, methodologically it adopts an inductive approach to building theory from relevant theoretical-empirical data, empirical literature, their analyses and emergent evidence-based arguments. Appropriate meaningfully-linked RBT and DCT case-specific data are ethically collected using standard methods including questionnaires, interviews, observation, and evaluation of some internal case documentation and public records. Thereupon, the data are evidentially analysed and customised by reference to the relevant mission statement and categorised across the six themes. They are then analysed using traditional case study analytical techniques including pattern matching, explanation building and synthesis in order to enable key findings to emerge. Finally, the emergent research findings are evaluated-interpreted in terms of mission effectiveness, so as to assert causal and/or associated links between relevant theoretical constructs and the findings.
The empirical findings suggest that all six identified themes varyingly affect performance and scalability. Further, they indicate that mission effectiveness is enhanced when resource based and dynamic capabilities are exercised within strategic management disciplines, especially where entrepreneurial means are deployed. This would suggest that Christian social action charities have potential to play a more positive and impactful role in providing social services in England, by systematically improving mission effectiveness via strategic use of RBT and DCT, combined suitably with entrepreneurial means.
Overall, drawing on the empirically identified deficiencies and/or inadequacies of RBT and DCT when applied to the effective accomplishments of social enterprise missions, the findings suggest a hybrid theory of both of them, tentatively named ‘Dynamic Resource Theory’ (DRT). This argues that social action practitioners are more effective when optimising key resources and capabilities using SE means in order to achieve missional impact results. Such a tentative theory will likely influence policies to incentivise improvements in governance, inter-firm collaboration and capacity building. Such policies would be of real practical benefit to practitioners. This theory makes an original contribution to knowledge in terms of social entrepreneurial mission effectiveness - probably most applicable within faith-based charities
A cost function for similarity-based hierarchical clustering
The development of algorithms for hierarchical clustering has been hampered
by a shortage of precise objective functions. To help address this situation,
we introduce a simple cost function on hierarchies over a set of points, given
pairwise similarities between those points. We show that this criterion behaves
sensibly in canonical instances and that it admits a top-down construction
procedure with a provably good approximation ratio
Time-scales of close-in exoplanet radio emission variability
We investigate the variability of exoplanetary radio emission using stellar
magnetic maps and 3D field extrapolation techniques. We use a sample of hot
Jupiter hosting stars, focusing on the HD 179949, HD 189733 and tau Boo
systems. Our results indicate two time-scales over which radio emission
variability may occur at magnetised hot Jupiters. The first is the synodic
period of the star-planet system. The origin of variability on this time-scale
is the relative motion between the planet and the interplanetary plasma that is
co-rotating with the host star. The second time-scale is the length of the
magnetic cycle. Variability on this time-scale is caused by evolution of the
stellar field. At these systems, the magnitude of planetary radio emission is
anticorrelated with the angular separation between the subplanetary point and
the nearest magnetic pole. For the special case of tau Boo b, whose orbital
period is tidally locked to the rotation period of its host star, variability
only occurs on the time-scale of the magnetic cycle. The lack of radio
variability on the synodic period at tau Boo b is not predicted by previous
radio emission models, which do not account for the co-rotation of the
interplanetary plasma at small distances from the star.Comment: 10 pages, 7 figures, 2 tables, accepted in MNRA
The magnetic fields of forming solar-like stars
Magnetic fields play a crucial role at all stages of the formation of low
mass stars and planetary systems. In the final stages, in particular, they
control the kinematics of in-falling gas from circumstellar discs, and the
launching and collimation of spectacular outflows. The magnetic coupling with
the disc is thought to influence the rotational evolution of the star, while
magnetised stellar winds control the braking of more evolved stars and may
influence the migration of planets. Magnetic reconnection events trigger
energetic flares which irradiate circumstellar discs with high energy particles
that influence the disc chemistry and set the initial conditions for planet
formation. However, it is only in the past few years that the current
generation of optical spectropolarimeters have allowed the magnetic fields of
forming solar-like stars to be probed in unprecedented detail. In order to do
justice to the recent extensive observational programs new theoretical models
are being developed that incorporate magnetic fields with an observed degree of
complexity. In this review we draw together disparate results from the
classical electromagnetism, molecular physics/chemistry, and the geophysics
literature, and demonstrate how they can be adapted to construct models of the
large scale magnetospheres of stars and planets. We conclude by examining how
the incorporation of multipolar magnetic fields into new theoretical models
will drive future progress in the field through the elucidation of several
observational conundrums.Comment: 55 pages, review article accepted for publication in Reports on
Progress in Physics. Astro-ph version includes additional appendice
Modeling X-ray emission from stellar coronae
By extrapolating from observationally derived surface magnetograms of
low-mass stars we construct models of their coronal magnetic fields and compare
the 3D field geometry with axial multipoles. AB Dor, which has a radiative
core, has a very complex field, whereas V374 Peg, which is completely
convective, has a simple dipolar field. We calculate global X-ray emission
measures assuming that the plasma trapped along the coronal loops is in
hydrostatic equilibrium and compare the differences between assuming isothermal
coronae, or by considering a loop temperature profiles. Our preliminary results
suggest that the non-isothermal model works well for the complex field of AB
Dor, but not for the simple field of V374 Peg.Comment: 4 pages, proceedings of Cool Stars 15, St Andrews, July 2008, to be
published in the Conference Proceedings Series of the American Institute of
Physic
On the environment surrounding close-in exoplanets
Exoplanets in extremely close-in orbits are immersed in a local
interplanetary medium (i.e., the stellar wind) much denser than the local
conditions encountered around the solar system planets. The environment
surrounding these exoplanets also differs in terms of dynamics (slower stellar
winds, but higher Keplerian velocities) and ambient magnetic fields (likely
higher for host stars more active than the Sun). Here, we quantitatively
investigate the nature of the interplanetary media surrounding the hot Jupiters
HD46375b, HD73256b, HD102195b, HD130322b, HD179949b. We simulate the
three-dimensional winds of their host stars, in which we directly incorporate
their observed surface magnetic fields. With that, we derive mass-loss rates
(1.9 to 8.0 /yr) and the wind properties at the
position of the hot-Jupiters' orbits (temperature, velocity, magnetic field
intensity and pressure). We show that these exoplanets' orbits are
super-magnetosonic, indicating that bow shocks are formed surrounding these
planets. Assuming planetary magnetic fields similar to Jupiter's, we estimate
planetary magnetospheric sizes of 4.1 to 5.6 planetary radii. We also derive
the exoplanetary radio emission released in the dissipation of the stellar wind
energy. We find radio fluxes ranging from 0.02 to 0.13 mJy, which are
challenging to be observed with present-day technology, but could be detectable
with future higher sensitivity arrays (e.g., SKA). Radio emission from systems
having closer hot-Jupiters, such as from tau Boo b or HD189733b, or from nearby
planetary systems orbiting young stars, are likely to have higher radio fluxes,
presenting better prospects for detecting exoplanetary radio emission.Comment: 15 pages, 5 figures, accepted to MNRA
Agricultural Club
Papers concerning the Agricultural Club at Utah Agricultural College, including their objects, by-laws, constitution, and work
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