9,066 research outputs found
Private experiments in global governance : primary commodity roundtables and the politics of deliberation
Emerging scholarship on global governance offers ever-more detailed analyses of private regulatory regimes. These regimes aim to regulate some area of social activity without a mandate from, or participation of, states or international organizations. While there are numerous empirical studies of these regimes, the normative theoretical literature has arguably struggled to keep pace with such developments. This is unfortunate, as the proliferation of private regulatory regimes raises important issues about legitimacy in global governance. The aim of this paper is to address some of these issues by elaborating a theoretical framework that can orientate normative investigation of these schemes. It does this through turning to the idea of experimentalist governance. It is argued that experimentalism can provide an important and provocative set of insights about the processes and logics of emerging governance schemes. The critical purchase of this theory is illustrated through an application to the case of primary commodities roundtables, part of ongoing attempts by NGOs, producers, and buyers to set sustainability criteria for commodity production across a range of sectors. The idea of experimentalist governance, we argue, can lend much needed theoretical structure to debates about the normative legitimacy of private regulatory regimes
Configuration spaces of products
We show that the configuration spaces of a product of parallelizable
manifolds may be recovered from those of the factors as the Boardman-Vogt
tensor product of right modules over the operads of little cubes of the
appropriate dimension. We also discuss an analogue of this result for manifolds
that are not necessarily parallelizable, which involves a new operad of skew
little cubes.Comment: 21 pages, 1 figure. To appear in Transactions of the AMS. May vary
slightly from published versio
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Sub-agent elements for control methods in multi-agent energy management system
Increased penetration of generation and decentralised control are considered to be feasible and effective solution for reducing cost and emissions and hence efficiency associated with power generation and distribution. Distributed generation in combination with the multi-agent technology are perfect candidates for this solution. Pro-active and autonomous nature of multi-agent systems can provide an effective platform for decentralised control whilst improving reliability and flexibility of the grid
Funding: Patterns and Guideposts in the Nonprofit Sector
Although funding is a pressing concern for nonprofit organizations across the United States, detailed information about how dollars flow within the sector is hard to come by. For example, are there distinct patterns to the ways in which nonprofit organizations are funded? If the answer to this question is "yes," those patterns could provide important "guideposts" for similar organizations planning their funddevelopment strategies.To begin answering this question, the Bridgespan Group researched the funding for three samples of nonprofit organizations using Form 990 returns, complemented by company-specific reports and personal interviews. 1. The largest organizations tend to rely on a single type of funding for the majority of their revenue, rather than having a balanced mix from a variety of funders. Among youth services and environmental advocacy organizations, there are distinct transition points across a spectrum ofrevenue sizes where organizations move from heterogeneous to singletypefunding.2. Among the largest organizations, the kind of work an organization does influences, but does not dictate, the identity of its dominant funding type.3. In the fields we selected for in-depth analysis -- youth services and environmental advocacy -- growth to a significant size is extremely rare, and the largest organizations control most of the resources.4. In youth services and environmental advocacy, there seem to be transition points in the typical funding mix used by organizations of different sizes, suggesting that the size of an organization influences its dominant funding type
A Dynamics and Stability Framework for Avian Jumping Take-off
Jumping take-off in birds is an explosive behaviour with the goal of
providing a rapid transition from ground to airborne locomotion. An effective
jump is predicated on the need to maintain dynamic stability through the
acceleration phase. The present study concerns understanding how birds retain
control of body attitude and trajectory during take-off. Cursory observation
suggests that stability is achieved with relatively little cost. However,
analysis of the problem shows that the stability margins during jumping are
actually very small and that stability considerations play a significant role
in selection of appropriate jumping kinematics. We use theoretical models to
understand stability in prehensile take-off (from a perch) and also in
non-prehensile take-off (from the ground). The primary instability is tipping,
defined as rotation of the centre of gravity about the ground contact point.
Tipping occurs when the centre of pressure falls outside the functional foot. A
contribution of the paper is the development of graphical tipping stability
margins for both centre of gravity location and acceleration angle. We show
that the nose-up angular acceleration extends stability bounds forward and is
hence helpful in achieving shallow take-offs. The stability margins are used to
interrogate simulated take-offs of real birds using published experimental
kinematic data from a guinea fowl (ground take-off) and a diamond dove (perch
take-off). For the guinea fowl the initial part of the jump is stable, however
simulations exhibit a stuttering instability not observed experimentally that
is probably due to absence of compliance in the idealised joints. The diamond
dove model confirms that the foot provides an active torque reaction during
take-off, extending the range of stable jump angles by around 45{\deg}.Comment: 21 pages, 11 figures; supplementary material:
https://figshare.com/s/86b12868d64828db0d5d; DOI: 10.6084/m9.figshare.721056
Living on the Edge: A Toy Model for Holographic Reconstruction of Algebras with Centers
We generalize the Pastawski-Yoshida-Harlow-Preskill (HaPPY) holographic
quantum error-correcting code to provide a toy model for bulk gauge fields or
linearized gravitons. The key new elements are the introduction of degrees of
freedom on the links (edges) of the associated tensor network and their
connection to further copies of the HaPPY code by an appropriate isometry. The
result is a model in which boundary regions allow the reconstruction of bulk
algebras with central elements living on the interior edges of the (greedy)
entanglement wedge, and where these central elements can also be reconstructed
from complementary boundary regions. In addition, the entropy of boundary
regions receives both Ryu-Takayanagi-like contributions and further corrections
that model the term of Faulkner, Lewkowycz,
and Maldacena. Comparison with Yang-Mills theory then suggests that this
term can be reinterpreted as a part of the
bulk entropy of gravitons under an appropriate extension of the physical bulk
Hilbert space.Comment: 20 pages, 11 figure
Geometry shapes evolution of early multicellularity
Organisms have increased in complexity through a series of major evolutionary
transitions, in which formerly autonomous entities become parts of a novel
higher-level entity. One intriguing feature of the higher-level entity after
some major transitions is a division of reproductive labor among its
lower-level units. Although it can have clear benefits once established, it is
unknown how such reproductive division of labor originates. We consider a
recent evolution experiment on the yeast Saccharomyces cerevisiae as a unique
platform to address the issue of reproductive differentiation during an
evolutionary transition in individuality. In the experiment, independent yeast
lineages evolved a multicellular "snowflake-like'' cluster form in response to
gravity selection. Shortly after the evolution of clusters, the yeast evolved
higher rates of cell death. While cell death enables clusters to split apart
and form new groups, it also reduces their performance in the face of gravity
selection. To understand the selective value of increased cell death, we create
a mathematical model of the cellular arrangement within snowflake yeast
clusters. The model reveals that the mechanism of cell death and the geometry
of the snowflake interact in complex, evolutionarily important ways. We find
that the organization of snowflake yeast imposes powerful limitations on the
available space for new cell growth. By dying more frequently, cells in
clusters avoid encountering space limitations, and, paradoxically, reach higher
numbers. In addition, selection for particular group sizes can explain the
increased rate of apoptosis both in terms of total cell number and total
numbers of collectives. Thus, by considering the geometry of a primitive
multicellular organism we can gain insight into the initial emergence of
reproductive division of labor during an evolutionary transition in
individuality.Comment: 7 figure
Nanoparticles in explosives detection â the state-of-the-art and future directions
No abstract available
A two-component transport model for solar wind fluctuations: Waves plus quasi-2D turbulence
We present a model for the transport of solar wind fluctuations, based on the assumption that they can be well-represented using two distinct components: a quasi-2D turbulence piece and a wave-like piece. For each component, coupled transport equations for its energy, cross helicity, and characteristic lengthscale(s) are derived, along with an equation for the proton temperature. This energy-containing âtwo-componentâ model includes the effects of solar wind expansion and advection, driving by stream shear and pickup ions, and nonlinear cascades. Nonlinear effects are modeled using a recently developed one-point phenomenology for such a two-component model of homogeneous MHD turbulence [1]. Heating due to these nonlinear effects is included in the temperature equation. Numerical solutions are discussed and compared with observation
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