The Role of Inter-Organizational Leadership in Agri-Food Value Chains

For many years research on marketing channel behaviour was focused on power and conflict between channel members. More recently, as a result of globalisation, firms have become more dependent on each other and more collaborative models of channel behaviour have developed to meet the demands of the global marketplace. Research suggests that closer relationships involving trust, commitment, co-operation, co-ordination, and collaboration are needed between chain members to ensure the success of their value chains. The major challenge is to identify and develop leadership styles that foster efficient and collaborative value chains. Generally, the literature suggests that supply chain effectiveness and survival is linked to leadership behaviour. Leader behaviour has needed to adapt to the competitive global environment, which tends to focus on fostering inter-organisational co-operation rather than competing in an adversarial way. In this climate, leaders need to possess supply chain management skills and, perhaps more critically, the ability to establish and maintain effective inter-organisational networks. Early exploratory research in manufacturing suggested that a participatory leadership style is most effective in fostering co-operation and increased supply chain performance.Agribusiness, Agricultural and Food Policy, Farm Management, Food Consumption/Nutrition/Food Safety, Industrial Organization,

Power analysis for detecting trends in juvenile spotted seatrout abundance in Florida Bay

The spotted seatrout (Cynoscion nebulosus) is considered a key species relative to the implementation of the Comprehensive Everglades Restoration Plan (CERP). One of the goals of the CERP is to increase freshwater flows to Florida Bay. Increased freshwater flows can have potential positive and negative impacts on spotted seatrout populations. At low salinities, the planktonic eggs of spotted seatrout sink to the bottom and are not viable (Alshuth and Gilmore, 1994; Holt and Holt, 2002). On the other hand, increased freshwater flows can alleviate hypersaline conditions that could result in an expansion of the distribution of the early life stages of spotted seatrout (Thayer et al., 1999; Florida Department of Environmental Protection1). Thus it would be useful to develop a monitoring program that can detect changes in seatrout abundance on time scales short enough to be useful to resource managers. The NOAA Center for Coastal Fisheries and Habitat Research (NOAA) has made sporadic collections of juvenile seatrout using otter trawls since 1984 (see Powell et al, 2004). The results suggest that it might be useful to sample for seatrout in as many as eight different areas or basins (Figure 1): Bradley Key, Sandy Key, Johnson Key, Palm Key, Snake Bight, Central, Whipray and Crocodile Dragover. Unfortunately, logistical constraints are likely to limit the number of tows to about 40 per month over a period of six months each year. Inasmuch as few seatrout are caught in any given tow and the proportion of tows with zero seatrout is often high, it is important to determine how best to allocate this limited sampling effort among the various basins so that any trends in abundance may be detected with sufficient statistical confidence. (PDF contains 16 pages

Spectral methods for the wave equation in second-order form

Current spectral simulations of Einstein's equations require writing the equations in first-order form, potentially introducing instabilities and inefficiencies. We present a new penalty method for pseudo-spectral evolutions of second order in space wave equations. The penalties are constructed as functions of Legendre polynomials and are added to the equations of motion everywhere, not only on the boundaries. Using energy methods, we prove semi-discrete stability of the new method for the scalar wave equation in flat space and show how it can be applied to the scalar wave on a curved background. Numerical results demonstrating stability and convergence for multi-domain second-order scalar wave evolutions are also presented. This work provides a foundation for treating Einstein's equations directly in second-order form by spectral methods.Comment: 16 pages, 5 figure

Spatial restriction of alpha4 integrin phosphorylation regulates lamellipodial stability and alpha4beta1-dependent cell migration.

Integrins coordinate spatial signaling events essential for cell polarity and directed migration. Such signals from alpha4 integrins regulate cell migration in development and in leukocyte trafficking. Here, we report that efficient alpha4-mediated migration requires spatial control of alpha4 phosphorylation by protein kinase A, and hence localized inhibition of binding of the signaling adaptor, paxillin, to the integrin. In migrating cells, phosphorylated alpha4 accumulated along the leading edge. Blocking alpha4 phosphorylation by mutagenesis or by inhibition of protein kinase A drastically reduced alpha4-dependent migration and lamellipodial stability. alpha4 phosphorylation blocks paxillin binding in vitro; we now find that paxillin and phospho-alpha4 were in distinct clusters at the leading edge of migrating cells, whereas unphosphorylated alpha4 and paxillin colocalized along the lateral edges of those cells. Furthermore, enforced paxillin association with alpha4 inhibits migration and reduced lamellipodial stability. These results show that topographically specific integrin phosphorylation can control cell migration and polarization by spatial segregation of adaptor protein binding

A global, collaborative, E-learning ecosystem: An academic/industry partnership in action

A number of apparent failures in the use of education technology should provide a warning as universities and training institutes progress their strategy and management plans for elearning. Fundamental problems in the academic environment relate to the lack of training in new technologies available to academics responsible for elearning. No less importantly the synergies among commercial providers of Asynchronous Learning Network (ALN) software, pedagogical knowledge and experiential learning requirements have not been addressed in the vision and strategy statements provided by senior management. The requisite solution is seen to be a framework for all stakeholders to evaluate e-learning proposals to ensure the effectiveness and value propositions are based in reality. What can we learn from the e-business environment and, in particular, the Cisco Network Academy Program (Academy Connection) that would inform the structure and deliverables required to support the proposed framework? This proposed framework also needs to accommodate value propositions for the diverse student cohorts involved in e-learning, having particular regard to professional practical requirements

Black hole-neutron star mergers: effects of the orientation of the black hole spin

The spin of black holes in black hole-neutron star (BHNS) binaries can have a strong influence on the merger dynamics and the postmerger state; a wide variety of spin magnitudes and orientations are expected to occur in nature. In this paper, we report the first simulations in full general relativity of BHNS mergers with misaligned black hole spin. We vary the spin magnitude from a/m=0 to a/m=0.9 for aligned cases, and we vary the misalignment angle from 0 to 80 degrees for a/m=0.5. We restrict our study to 3:1 mass ratio systems and use a simple Gamma-law equation of state. We find that the misalignment angle has a strong effect on the mass of the postmerger accretion disk, but only for angles greater than ~ 40 degrees. Although the disk mass varies significantly with spin magnitude and misalignment angle, we find that all disks have very similar lifetimes ~ 100ms. Their thermal and rotational profiles are also very similar. For a misaligned merger, the disk is tilted with respect to the final black hole's spin axis. This will cause the disk to precess, but on a timescale longer than the accretion time. In all cases, we find promising setups for gamma-ray burst production: the disks are hot, thick, and hyperaccreting, and a baryon-clear region exists above the black hole.Comment: 15 pages, 13 figure

Black hole evolution by spectral methods

Current methods of evolving a spacetime containing one or more black holes are plagued by instabilities that prohibit long-term evolution. Some of these instabilities may be due to the numerical method used, traditionally finite differencing. In this paper, we explore the use of a pseudospectral collocation (PSC) method for the evolution of a spherically symmetric black hole spacetime in one dimension using a hyperbolic formulation of Einstein's equations. We demonstrate that our PSC method is able to evolve a spherically symmetric black hole spacetime forever without enforcing constraints, even if we add dynamics via a Klein-Gordon scalar field. We find that, in contrast to finite-differencing methods, black hole excision is a trivial operation using PSC applied to a hyperbolic formulation of Einstein's equations. We discuss the extension of this method to three spatial dimensions.Comment: 20 pages, 17 figures, submitted to PR

Measuring Planck beams with planets

Aims. Accurate measurement of the cosmic microwave background (CMB) anisotropy requires precise knowledge of the instrument beam. We explore how well the Planck beams will be determined from observations of planets, developing techniques that are also appropriate for other experiments. Methods. We simulate planet observations with a Planck-like scanning strategy, telescope beams, noise, and detector properties. Then we employ both parametric and non-parametric techniques, reconstructing beams directly from the time-ordered data. With a faithful parameterization of the beam shape, we can constrain certain detector properties, such as the time constants of the detectors, to high precision. Alternatively, we decompose the beam using an orthogonal basis. For both techniques, we characterize the errors in the beam reconstruction with Monte Carlo realizations. For a simplified scanning strategy, we study the impact on estimation of the CMB power spectrum. Finally, we explore the consequences for measuring cosmological parameters, focusing on the spectral index of primordial scalar perturbations, n_s. Results. The quality of the power spectrum measurement will be significantly influenced by the optical modeling of the telescope. In our most conservative case, using no information about the optics except the measurement of planets, we find that a single transit of Jupiter across the focal plane will measure the beam window functions to better than 0.3% for the channels at 100–217 GHz that are the most sensitive to the CMB. Constraining the beam with optical modeling can lead to much higher quality reconstruction. Conclusions. Depending on the optical modeling, the beam errors may be a significant contribution to the measurement systematics for n_s

Originalism After Dobbs, Bruen, and Kennedy: The Role of History and Tradition

In three recent cases, the constitutional concepts of history and tradition have played important roles in the reasoning of the Supreme Court. Dobbs v. Jackson Women’s Health Organization relied on history and tradition to overrule Roe v. Wade. New York State Rifle & Pistol Ass’n v. Bruen articulated a history and tradition test for the validity of laws regulating the right to bear arms recognized by the Second Amendment. Kennedy v. Bremerton School District looked to history and tradition in formulating the test for the consistency of state action with the Establishment Clause. These cases raise important questions about the Court’s approach to constitutional interpretation and construction. Do Dobbs, Bruen, and Kennedy represent a new theory of constitutional interpretation and construction based on history and tradition? In the alternative, should the references to history and tradition in these opinions be understood through the lens of Constitutional Pluralism as modalities of constitutional argument? Finally, can the use of history and tradition in Dobbs, Bruen, and Kennedy be reconciled with the Supreme Court’s embrace of Public Meaning Originalism? Part I of this Article elucidates the constitutional concepts of history and tradition. Part II lays out four distinct roles that history and tradition can play: (1) as evidence of original meaning and purpose, (2) as modalities of constitutional argument within a constitutional pluralist framework, (3) as a novel constitutional theory, which we call “Historical Traditionalism,” and (4) as an implementing doctrine. Part III investigates the roles of history and tradition in Dobbs, Bruen, and Kennedy. Part IV articulates a comprehensive strategy for the incorporation of history and tradition in constitutional jurisprudence

Originalism After Dobbs, Bruen, and Kennedy: The Role of History and Tradition

In three recent cases, the constitutional concepts of history and tradition have played important roles in the reasoning of the Supreme Court. Dobbs v. Jackson Women’s Health Organization relied on history and tradition to overrule Roe v. Wade. New York State Rifle & Pistol Ass’n v. Bruen articulated a history and tradition test for the validity of laws regulating the right to bear arms recognized by the Second Amendment. Kennedy v. Bremerton School District looked to history and tradition in formulating the test for the consistency of state action with the Establishment Clause. These cases raise important questions about the Court’s approach to constitutional interpretation and construction. Do Dobbs, Bruen, and Kennedy represent a new theory of constitutional interpretation and construction based on history and tradition? In the alternative, should the references to history and tradition in these opinions be understood through the lens of Constitutional Pluralism as modalities of constitutional argument? Finally, can the use of history and tradition in Dobbs, Bruen, and Kennedy be reconciled with the Supreme Court’s embrace of Public Meaning Originalism? Part I of this Article elucidates the constitutional concepts of history and tradition. Part II lays out four distinct roles that history and tradition can play: (1) as evidence of original meaning and purpose, (2) as modalities of constitutional argument within a constitutional pluralist framework, (3) as a novel constitutional theory, which we call “Historical Traditionalism,” and (4) as an implementing doctrine. Part III investigates the roles of history and tradition in Dobbs, Bruen, and Kennedy. Part IV articulates a comprehensive strategy for the incorporation of history and tradition in constitutional jurisprudence