4,713 research outputs found

    Histogram analysis as a method for determining the line tension by Monte-Carlo simulations

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    A method is proposed for determining the line tension, which is the main physical characteristic of a three-phase contact region, by Monte-Carlo (MC) simulations. The key idea of the proposed method is that if a three-phase equilibrium involves a three-phase contact region, the probability distribution of states of a system as a function of two order parameters depends not only on the surface tension, but also on the line tension. This probability distribution can be obtained as a normalized histogram by appropriate MC simulations, so one can use the combination of histogram analysis and finite-size scaling to study the properties of a three phase contact region. Every histogram and results extracted therefrom will depend on the size of the simulated system. Carrying out MC simulations for a series of system sizes and extrapolating the results, obtained from the corresponding series of histograms, to infinite size, one can determine the line tension of the three phase contact region and the interfacial tensions of all three interfaces (and hence the contact angles) in an infinite system. To illustrate the proposed method, it is applied to the three-dimensional ternary fluid mixture, in which molecular pairs of like species do not interact whereas those of unlike species interact as hard spheres. The simulated results are in agreement with expectations

    Supply Chain Engagement Through Relationship Management?

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    Many studies carried out in relation to construction procurement methods have revealed evidence that there needs to be a change of culture and attitude in the construction industry, moving away from traditional adversarial relationships to cooperative and collaborative relationships. At the same time there is also increasing concern and discussion on alternative procurement methods, involving a movement away from traditional procurement systems. Relational contracting approaches, such as relationship management, are business strategies whereby client, commercial participants' and stakeholders' objectives are aligned. This paper reviews a range of relationship management project case studies undertaken between public and private organisations in Queensland, Australia and reports on the critical factors identified that influence the success of relationship management projects. The research takes place within the context of the supply chain and reflects attempts by a government agency to engage the supply chain through relationship management approaches. The advantages accruing from engagement include community benefit, added value and innovation. Relationship management is a system that provides a collaborative environment and a framework for all participants to adapt their behaviour to project objectives and allows for engagement of those subcontractors and suppliers 'down the supply chain'. It is about open communication, sharing resources and experiences, exposing the 'hidden' risks in the project for the benefit of all participants. The case studies suggest that leadership has a strong influence on the relationship management climate which needs to be facilitated and nurtured. Commitment and action by the senior management (and, so, parent organisations) can have a strong impact on the team and relationship management culture, indicating relationship management has a high chance of failure when there is inadequate support from top management. Like all relational contracting approaches, trust between relationship management partners is important. The authors conclude that without a positive approach to relationship management a sustainable industry and continuous improvement are not possible. So, the authors postulate that a 'sustainable supply chain' is essentially tautological without the existence of a clear relational vision that leads to both soft and hard infrastructure to assist and inform decision making and encourage relationship building. An example of this is discussed at the end of the paper

    An Equation of State of Gases at High Temperatures and Densities

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    State equation of molecular gas at high temperatures and densitie

    Constraining coherent low frequency radio flares from compact binary mergers

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    The presence and detectability of coherent radio emission from compact binary mergers (containing at least one neutron star) remains poorly constrained due to large uncertainties in the models. These compact binary mergers may initially be detected as Short Gamma-ray Bursts (SGRBs) or via their gravitational wave emission. Several radio facilities have developed rapid response modes enabling them to trigger on these events and search for this emission. For this paper, we constrain this coherent radio emission using the deepest available constraints for GRB 150424A, which were obtained via a triggered observation with the Murchison Widefield Array. We then expand this analysis to determine the properties of magnetar merger remnants that may be formed via a general population of binary neutron star mergers. Our results demonstrate that many of the potential coherent emission mechanisms that have been proposed for such events can be detected or very tightly constrained by the complementary strategies used by the current generation of low-frequency radio telescopes.Comment: 19 pages, submitted to MNRA

    Formation of capillary bridges in AFM-like geometry

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    We discuss the phase diagram of fluid confined in AFM-like geometry. It combines the properties of capillary condensation and complete filling of a wedge.Comment: 9 pages, 7 figure

    Stability of freely falling granular streams

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    A freely falling stream of weakly cohesive granular particles is modeled and analysed with help of event driven simulations and continuum hydrodynamics. The former show a breakup of the stream into droplets, whose size is measured as a function of cohesive energy. Extensional flow is an exact solution of the one-dimensional Navier-Stokes equation, corresponding to a strain rate, decaying like 1/t from its initial value, gammaDot0. Expanding around this basic state, we show that the flow is stable for short times (gammaDot0 * t << 1), whereas for long times (gammaDot0 * t >> 1) perturbations of all wavelength grow. The growthrate of a given wavelength depends on the instant of time when the fluctuation occurs, so that the observable patterns can vary considerably.Comment: 4 page, 5 figures. Submitted to PRL. Supplementary material: see http://wwwuser.gwdg.de/~sulrich/research/#Publication

    Eigenvalue multiplicity in cubic graphs

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    Let G be a connected cubic graph of order n with μ as an eigenvalue of multiplicity k. We show that (i) if μ∉{-1,0} then k≤12n, with equality if and only if μ=1 and G is the Petersen graph; (ii) if μ=-1 then k≤12n+1, with equality if and only if G=K4; (iii) if μ= then k≤12n+1, with equality if and only if G=2K3¯

    Alliancing in Australia - No-Litigation Contracts: A Tautology?

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    A project alliance is a business strategy whereby client and commercial participants’ objectives are aligned. This paper takes an alliance project between public and private organizations in Queensland, Australia as a case study and reports the critical factors identified that influence the success of the alliance project. Alliancing is a system that provides a collaborative environment and a framework to adapt behavior to project objectives. It is about sharing resources and experiences, exposing the “hidden” risks. The case study suggests that leadership has a strong influence on the alliance climate. Commitment and action by the Project Alliance Board and, so, parent organizations have a strong impact on the team and alliance culture, indicating alliancing has a high chance of failure when there is inadequate support from top management. Like all relational contracting approaches, trust between alliance partners is important. This case study project takes a further step toward reinforcing the trust element by placing a No-Dispute clause in the alliance agreement. A review of the effects of the no-litigation clause upon the project team is presented. The writers conclude that without a positive approach to relationship management, a No-Dispute approach is impossible. Hence, they postulate that a “no-litigation” alliancing contract is essentially tautological, and go on to argue that a no-litigation contract cannot exist without the help of a clear relational vision, that leads to both soft and hard infrastructure to assist in decision making and relationship building
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