67,258 research outputs found
8. J. M. Binner, L. R. Fletcher, V. Kolokoltsov, F. Ciardiello (2013). External Pressure on Alliances: What does Prisoners Dilemma Reveal?, Games, 4(4), 754-775.ISSN 2073-4336
No full textTools for non-linear time series forecasting in economics - an empirical comparison of regime switching vector autoregressive models and recurrent neural networks
No full textThe purpose of this study is to contrast the forecasting performance of two non-linear models, a regime-switching vector autoregressive model (RS-VAR) and a recurrent neu-ral network (RNN), to that of a linear benchmark VAR model. Our specific forecasting experiment is UK inflation and we utilize monthly data from 1969-2003. The RS-VAR and the RNN perform approximately on par over both monthly and annual forecast hori-zons. Both non-linear models perform significantly better than the VAR model. Keywords: Inflation forecasting, regime-switching vector autoregressive model, recurrent neural network
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Get PDFFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
TEXStrict Nash equilibria in a duopolistic market share model
Get PDFThis paper develops a duopolistic discounted marketing model with linear advertising costs and advertised prices for mature markets still in expansion. Generic and predatory advertising eects are combined together in the model. We characterise a class of advertising models with some eciency for production costs. For such a class of models, advertising investments have a no-free-riding strict Nash equilibrium in pure strategies if discount rates are small. We discuss the entity of this eciency at varying of parameters of our advertising model. We provide a computational framework in which market shares can be computed at equilibrium, too. We analyse market share dynamics for an asymmetrical numerical scenario where one of the two rms is more eective in generic andpredatory advertising. Several numerical insights on market share dynamics are obtained. Our computational framework allows for dierent scenarios in practical applications and it is developed using the Mathematica software. We provide rational insights on how competing rms might ultimately reduce the qualityof manufactured goods when they publish the prices at the beginning of marketing campaigns
Letter from Carl Hayden to M. J. Riordan
No full textLetter from Carl Hayden to M. J. Riordan expressing his support for Coconino County in turning over the Bright Angel Trail to the federal government
Letter from M. J. Riordan, Arizona Lumber and Timber Company, to Carl Hayden
No full textLetter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail
City evacuations an interdisciplinary approach
No full textEvacuating a city is a complex problem that involves issues of governance, preparedness education, warning, information sharing, population dynamics, resilience and recovery. As natural and anthropogenic threats to cities grow, it is an increasingly pressing problem for policy makers and practitioners. The book is the result of a unique interdisciplinary collaboration between researchers in the physical and social sciences to consider how an interdisciplinary approach can help plan for large scale evacuations. It draws on perspectives from physics, mathematics, organisation theory, economics, sociology and education. Importantly it goes beyond disciplinary boundaries and considers how interdisciplinary methods are necessary to approach a complex problem involving human actors and increasingly complex communications and transportation infrastructures. Using real world case studies and modelling the book considers new approaches to evacuation dynamics. It addresses questions of complexity, not only in terms of theory, but examining the latest challenges for cities and emergency responders. Factors such as social media, information quality and visualisation techniques are examined to consider the ‘new’ dynamics of warning and informing, evacuation and recovery
Evaluation of the atrial evoked response for capture detection with high-polarization leads.
No full textAutoCapture based on the evoked response can be confounded by electrode
polarization. In this study, polarization was measured in human subjects who had
chronic atrial leads. The aim of the study was to determine whether electrode
polarization can be measured using a time integral atrial evoked-response
integral (AERI) of the negative portion of the atrial paced ER evoked-response
signal and to determine whether high-polarization atrial leads unsuitable for
AutoCapture can be identified a priori. Atrial intracardiac-electrogram (IEGM)
signals from 39 patients with implanted pacemakers were recorded and analyzed.
The signals were recorded during conventional atrial-threshold searches. A total
of 221 atrial-capture thresholds were recorded, ranging from 0.25 to 2.75 V with
a mean of 0.79 V. Each evoked response was evaluated using the AERI in a 36 ms
window following the 0.4 ms atrial stimulus. The polarization was estimated as a
linear function of stimulus voltage using the evoked-response signal integral of
captured beats identified on the IEGM. The 221 threshold-search datasets were
obtained using leads with eight different electrode materials. Polarization
could be measured using AERI as a function of stimulus voltage. Furthermore,
this polarization measure can be used to identify high-polarization leads, which
are ill suited for the atrial AutoCapture algorithm
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
Get PDFThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
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