Multi-level agent-based modeling with the Influence Reaction principle

This paper deals with the specification and the implementation of multi-level agent-based models, using a formal model, IRM4MLS (an Influence Reaction Model for Multi-Level Simulation), based on the Influence Reaction principle. Proposed examples illustrate forms of top-down control in (multi-level) multi-agent based-simulations

Top-ology

I compare the anticipated properties of the top quark with what is known experimentally about the heaviest fermion. I review the scientific opportunities that will be presented in the near future by copious samples of top. These include refined tests of electroweak radiative corrections, studies of the nature of top itself, and exploration of electroweak symmetry breaking. I conclude by illustrating top's influence in the everyday world.Comment: 18 pages, uuencoded PostScript (Lecture given at LISHEP95, LAFEX International School of High Energy Physics, Workshop on Heavy Flavors $cbt$, Rio de Janeiro, February 1995

The Quale of Time

Time is one of the greatest subjects of interest to the disciplines of both Science and Philosophy, being seen to have a greater importance in the workings of reality than other entities. In this paper, a phenomenological analysis of time based on the general workings of the emergent structure of consciousness will be done, and time will be shown to be no different than any other qualia. It will be shown that, like any other qualia, time is an emergent level of consciousness, manifesting all the properties of emergence: inheritance of qualities from the previous levels, top-down influence in levels received from the higher levels and top-down influence in levels impressed on the lower levels

Top Production in Hadron-Hadron Collisions and Anomalous Top-Gluon Couplings

We discuss the influence of anomalous tbar-t-G couplings on total and differential tbar-t production cross sections in hadron-hadron collisions. We study in detail the effects of a chromoelectric and a chromomagnetic dipole moment, d' and \mu', of the top quark. In the d'-\mu' plane, we find a whole region where the anomalous couplings give a zero net contribution to the total top production rate. In differential cross sections, the anomalous moments have to be quite sizable to give measurable effects. We estimate the values of d' and \mu' which are allowed by the present Tevatron experimental results on top production. A chromoelectric dipole moment of the top violates CP invariance. We discuss a simple CP-odd observable which allows for a direct search for CP violation in top production.Comment: footnote pg. 4 changed, acknowledgments extende

Determination of the top quark mass from leptonic observables

We present a procedure for the determination of the mass of the top quark at the LHC based on leptonic observables in dilepton $t\bar{t}$ events. Our approach utilises the shapes of kinematic distributions through their few lowest Mellin moments; it is notable for its minimal sensitivity to the modelling of long-distance effects, for not requiring the reconstruction of top quarks, and for having a competitive precision, with theory errors on the extracted top mass of the order of 0.8 GeV. A novel aspect of our work is the study of theoretical biases that might influence in a dramatic way the determination of the top mass, and which are potentially relevant to all template-based methods. We propose a comprehensive strategy that helps minimise the impact of such biases, and leads to a reliable top mass extraction at hadron colliders.Comment: 29 pages, 3 figure

Top-mounted inlet system feasibility for transonic-supersonic fighter aircraft

The more salient findings are presented of recent top inlet performance evaluations aimed at assessing the feasibility of top-mounted inlet systems for transonic-supersonic fighter aircraft applications. Top inlet flow field and engine-inlet performance test data show the influence of key aircraft configuration variables-inlet longitudinal position, wing leading-edge extension planform area, canopy-dorsal integration, and variable incidence canards-on top inlet performance over the Mach range of 0.6 to 2.0. Top inlet performance data are compared with those or more conventional inlet/airframe integrations in an effort to assess the viability of top-mounted inlet systems relative to conventional inlet installations

Influence of gas flow rate on liquid distribution in trickle-beds using perforated plates as liquid distributors

Two wire mesh tomography devices and a liquid collector were used to study the influence of the gas flow rate on liquid distribution when fluids distribution on top of the reactor is ensured by a perforated plate. In opposition to most of the studies realized by other authors, conditions in which the gas has a negative impact in liquid distribution were evidenced. Indeed, the obtained results show that the influence of gas flow rate depends on the quality of the initial distribution, as the gas forces the liquid to "respect" the distribution imposed at the top of the reactor. Finally, a comparison between the two measuring techniques shows the limitations of the liquid collector and the improper conclusions to which its use could lead

The choice of insider or outsider top executives in acquired companies

There is considerable debate amongst academics and practitioners over whether top executives of acquired or merged companies should stay or go, post-deal, as studies exploring the link with organisational performance show mixed results. This may in part be due to such studies failing to recognise that there are a number of distinct post-acquisition strategies which may require the deployment of different types of top executive. This paper addresses this limitation by bringing together the longstanding Insider/Outsider debate with a post-acquisition integration framework, in order to investigate whether there is a link between top management type and post-acquisition integration strategy. Using a dual methodology of survey and cases drawing on UK M&A data, clear associations are found between top executive type and particular post-acquisition styles. Underlying these patterns, the value-creating/value-capturing distinction of the Resource-Based View appears to have a greater influence over top executive deployment than do issues of Organisational Fit. This suggests strategic intentions have ascendancy over organisational constraints in the selection of top executives for managing post-acquisition integration