On the numerical solution of a wheel suspension benchmark problem

AbstractFor the simulation of a five-link wheel suspension, an alternative formulation with built-in projection and corresponding numerical algorithms are presented. The wheel suspension, a bechmark problem in vehicle dynamics, can only be modeled as a system of differential-algebraic equations (DAEs). Besides the numerical integration, the computation of consistent initial values and the treatment of discontinuities play an important role. Simulation results illustrate the performance of the introduced algorithms

BAYES' ESTIMATES OF THE DOUBLE HURDLE MODEL IN THE PRESENCE OF FIXED COSTS

We present a model of market adoption (participation) where the presence of non-negligible fixed costs leads to non-zero censoring of the traditional double-hurdle regression. Fixed costs arise due to household resources that must be devoted a priori to the decision to participate in the market. These costs-usually a cost of time-motivate two-step decision-making and focus attentions on the minimum-efficient scale of operations (the minimum amount of milk sales) at which market entry becomes viable. This focus, in turn, motivates a non-zero-censored Tobit regression estimated through routine application of Markov chain Monte Carlo Methods.market participation, fixed costs, double-hurdle model, censored regression., Financial Economics, O1, O11, C34, O13, Q16, D1,

OPTIMAL GRAZING PRESSURE UNDER OUTPUT PRICE AND PRODUCTION UNCERTAINTY WITH ALTERNATIVE FUNCTIONAL FORMS

This study uses a Cox parametric bootstrap test to select between two specifications of the von Liebig hypothesis, a switching regression model and a non-linear mixed stochastic plateau function. The selected production function was used to determine optimal stocking density for dual-purpose winter wheat, under production and output price uncertainty. The switching regression approach was rejected in favor of the non-linear mixed stochastic plateau function. The relatively small difference in optimal stocking density between risk aversion and risk neutrality suggests that risk-aversion is much less important in explaining producer response to uncertainty than is nonlinearity in the production function.Agribusiness,

Nitrilotriacetato Complexes of Lanthanides - A Thermochemical Study

The heats of formation of mono- and bis-nitrilotriacetato complexes of tervalent lanthanide ions were measured calorimetrically at 20\u27 C in 0.1 M KN03• From the experimental heat data and the formation constants determined by others under similar experimental conditions the entropy changes on coordination were calculated. A support is given for the opinion that, in essentially electrostatic complexes, the complex formation enthalpies and entropies are mutually correlated because of the displacement of solvent molecules in complex formation

Detection of SUSY Signals in Stau Neutralino Co-annihilation Region at the LHC

We study the prospects of detecting the signal in the stau neutralino co-annihilation region at the LHC using tau leptons. The co-annihilation signal is characterized by the stau and neutralino mass difference (dM) to be 5-15 GeV to be consistent with the WMAP measurement of the cold dark matter relic density as well as all other experimental bounds within the minimal supergravity model. Focusing on tau's from neutralino_2 --> tau stau --> tau tau neutralino_1 decays in gluino and squark production, we consider inclusive MET+jet+3tau production, with two tau's above a high E_T threshold and a third tau above a lower threshold. Two observables, the number of opposite-signed tau pairs minus the number of like-signed tau pairs and the peak position of the di-tau invariant mass distribution, allow for the simultaneous determination of dM and M_gluino. For dM = 9 GeV and M_gluino = 850 GeV with 30 fb^-1 of data, we can measure dM to 15% and M_gluino to 6%.Comment: 4 pages LaTex, 3 figures. To appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 2006. A typo in a reference is correcte

Intelligent cloud manufacturing platform for efficient resource sharing in smart manufacturing networks

Abstract Modern manufacturing demands are characterized by high fluctuations with negative impact on resource efficiency. In this framework, Industry 4.0 key enabling technologies such as cloud manufacturing enable the sharing of distributed resources for effective use at industrial network level. In this work, an intelligent cloud manufacturing platform is proposed to increase resource efficiency in a manufacturing network through dynamic sharing of manufacturing services, including computational, software as well as physical manufacturing resources, that can be offered on demand according to a service-oriented paradigm. The cloud-based platform includes a database module where user input data are collected, an intelligent module for data processing, optimization and feasible solutions generation, and a decision support module for solutions evaluation and comparison. A case study demonstrates technical and economic advantages for industrial resource efficiency improvement

Did LIGO detect dark matter?

We consider the possibility that the black-hole (BH) binary detected by LIGO may be a signature of dark matter. Interestingly enough, there remains a window for masses $20\,M_\odot \lesssim M_{\rm bh} \lesssim 100\, M_\odot$ where primordial black holes (PBHs) may constitute the dark matter. If two BHs in a galactic halo pass sufficiently close, they radiate enough energy in gravitational waves to become gravitationally bound. The bound BHs will rapidly spiral inward due to emission of gravitational radiation and ultimately merge. Uncertainties in the rate for such events arise from our imprecise knowledge of the phase-space structure of galactic halos on the smallest scales. Still, reasonable estimates span a range that overlaps the $2-53$ Gpc$^{-3}$ yr$^{-1}$ rate estimated from GW150914, thus raising the possibility that LIGO has detected PBH dark matter. PBH mergers are likely to be distributed spatially more like dark matter than luminous matter and have no optical nor neutrino counterparts. They may be distinguished from mergers of BHs from more traditional astrophysical sources through the observed mass spectrum, their high ellipticities, or their stochastic gravitational wave background. Next generation experiments will be invaluable in performing these tests.Comment: 5 pages, 2 figures, updated to match version published in PR