Search results for " points"
showing 10 items of 214 documents
Statics and dynamics of colloid-polymer mixtures near their critical point of phase separation: A computer simulation study of a continuous Asakura–O…
2008
We propose a new coarse-grained model for the description of liquid-vapor phase separation of colloid-polymer mixtures. The hard-sphere repulsion between colloids and between colloids and polymers, which is used in the well-known Asakura-Oosawa (AO) model, is replaced by Weeks-Chandler-Anderson potentials. Similarly, a soft potential of height comparable to thermal energy is used for the polymer-polymer interaction, rather than treating polymers as ideal gas particles. It is shown by grand-canonical Monte Carlo simulations that this model leads to a coexistence curve that almost coincides with that of the AO model and the Ising critical behavior of static quantities is reproduced. Then the …
Multi-scenario multi-objective robust optimization under deep uncertainty: A posteriori approach
2021
This paper proposes a novel optimization approach for multi-scenario multi-objective robust decision making, as well as an alternative way for scenario discovery and identifying vulnerable scenarios even before any solution generation. To demonstrate and test the novel approach, we use the classic shallow lake problem. We compare the results obtained with the novel approach to those obtained with previously used approaches. We show that the novel approach guarantees the feasibility and robust efficiency of the produced solutions under all selected scenarios, while decreasing computation cost, addresses the scenario-dependency issues, and enables the decision-makers to explore the trade-off …
On a class of special linear systems of P^3
2003
In this paper we deal with linear systems of P^3 through fat points. We consider the behavior of these systems under a cubo-cubic Cremona transformation that allows us to produce a class of special systems which we conjecture to be the only ones.
Geodesic ray transform with matrix weights for piecewise constant functions
2019
We show injectivity of the geodesic X-ray transform on piecewise constant functions when the transform is weighted by a continuous matrix weight. The manifold is assumed to be compact and nontrapping of any dimension, and in dimension three and higher we assume a foliation condition. We make no assumption regarding conjugate points or differentiability of the weight. This extends recent results for unweighted transforms.
Critical points for nondifferentiable functions in presence of splitting
2006
A classical critical point theorem in presence of splitting established by Brézis-Nirenberg is extended to functionals which are the sum of a locally Lipschitz continuous term and of a convex, proper, lower semicontinuous function. The obtained result is then exploited to prove a multiplicity theorem for a family of elliptic variational-hemivariational eigenvalue problems. © 2005 Elsevier Inc. All rights reserved.
Verzweigungsgrad und viskositätszahl bei polystyrolen
1961
Das Quadrat des Tragheitsradius r2 eines verzweigten Molekuls ist gegenuber dem des unverzweigten Molekuls r02 um den Faktor g = r2/r02 herabgesetzt. Hieraus ergibt sich nach ZIMM und KILB eine Verringerung der Viskositatszahl (STAUDINGER-Index) um den Betrag Diese Beziehung wird an Polystyrolen verschiedenen Verzweigungsgrades nachgepruft. Hierzu werden trifunktionell verzweigte Polystyrole mit definiertem Verzweigungsgrad hergestellt. Die relative Ubertragungskonstante am Polystyrol wurde fruher durch reaktionskinetische Messungen zu Cpol = 1,9·10−4 bei 60°C bestimmt. Die Kenntnis dieser Grose ermoglicht es, durch thermische Polymerisation bis zu verschieden hohen Umsatzen unverzweigte Po…
Imbalance of Power: Social Service Entrepreneurss Experiences of Entrepreneur-Municipality Relationship
2014
We investigate the complex dynamics between social service entrepreneurs and social sector managers through the lens of network metaphor, utilizing our data on social service entrepreneurs’ experiences of cooperation with municipalities. We examine what kinds of dependencies exist in the entrepreneur–municipality relationships and what kind of consequences these dependencies have on social service businesses run by entrepreneurs. Basing on the social service entrepreneurs experience, our findings suggest that while the cooperation with the municipality represents a prerequisite for success, their business represent only one alternative for the renewal of social service structures from the p…
Estimating the substitutability between private and public consumption: the case of Spain, 1960–2003
2005
This paper examines the relationship between private and public consumption using Spanish data over the period 1960–2003, using a two-good permanent-income model. We extend previous analysis addressing the question of whether this relationship is stable over time, or exhibits a structural break allowing the instability to occur at an unknown point in time. Our empirical results indicated the existence of a long-run relationship between private and public consumption. We also detect a structural change of regime shift in the cointegration regression around the time of 1973–74. Finally, the estimated intratemporal and intertemporal elasticities of substitution between the two types of expendi…
Asset Markets and Equilibrium Selection in Public Goods Games with Provision Points: An Experimental Study
2001
This paper reports the experimental results of implicit pre-play communication on the equilibrium selection in threshold public goods game experiments. The existence of an asset market in which the right to participate in a public goods game with a provision point is auctioned off among a larger group in a first stage is found to enhance significantly the contribution to the provision of the public good in a subsequent second stage. Though, contributions declined on average in the repeated public goods game when subjects were endowed with the right to play, they increased when subjects purchased the right to play. Once reached the Pareto-dominant equilibrium in the second stage, the auction…
Is ex‐ante ex‐post analysis irrelevant to Keynes's theory of employment?
2004
Ex‐ante ex‐post analysis has become a standard tool in macroeconomics. Yet Keynes dismissed it. We argue that Keynes's dismissal of ex‐ante ex‐post analysis is not an oddity but an indication of the originality of his theory of employment compared to standard macroeconomics. First, the principle of effective demand does not amount to a process that determines employment and income at the point of intersection of the traditionally defined ex ante supply and demand functions. Second, the finance motive allowed Keynes to confirm the identity of aggregate supply and demand already asserted in The General Theory. This latter conclusion is puzzling, however, since the principle of effective deman…