4,215,203 research outputs found
Criminal justice in France after September 11: Has the balance between liberty and security been disturbed?
This is the abstract of the conference paper delivered at the Ninth Biennial International Conference - Societies in Transition: Balancing Security, Social Justice and Tradition in 2010
Stochastic effects on the dynamics of a resonant MEMS magnetometer: a Monte Carlo investigation
In the design of Lorentz force MEMS magnetometers, the coupled thermo-electro-magneto-mechanical fields governing the dynamics of the relevant compliant structures can be appropriately exploited to enhance their performances. In recent works, we showed that reduced-order models for the dynamics of the said movable structures can be recast in the form of the Duffing equation, where nonlinear terms arise from the multi-physics governing the problem. As stochastic effects may play a role due to the micrometric dimensions of the device, an investigation of the link between the statistics of sensor imperfections and output is here carried out. The said imperfections at the microscopic length-scale are modeled in terms of: overetch thickness, assumed to feature a uniform distribution in a proper interval matching available experimental data; and elastic properties of the vibrating polycrystalline silicon film, as obtained through a numerical homogenization procedure over a representative film volume. To get insights into the effects of the parameters governing the nonlinear dynamics of the resonant structure, a Monte Carlo analysis is adopted
The UK association conference attendance decision-making process
This paper reports on research carried out into the consumer behaviour displayed by UK association conference delegates when deciding to attend a conference. Examination of the available literature suggested that there has been little investigation of the delegate's perspective on attending a conference, as most research into business events has traditionally been centred on the supply side particularly convention destination image, and association site selection. The paper found six underlying dimensions of the UK association conference delegate decision-making process - personal/professional development, networking opportunities, cost, location, time and convenience and health and wellbeing. Additionally, regression analysis showed that two of the dimensions (networking opportunities and cost) were significant predictors of intention to attend the conference again in the future
The Entropy Conundrum: A Solution Proposal
In 2004, physicist Mark Newman, along with biologist Michael Lachmann and computer scientist Cristopher Moore, showed that if electromagnetic radiation is used as a transmission medium, the most information-efficient format for a given 1-D signal is indistinguishable from blackbody radiation. Since many natural processes maximize the Gibbs-Boltzmann entropy, they should give rise to spectra indistinguishable from optimally efficient transmission. In 2008, computer scientist C.S. Calude and physicist K. Svozil proved that "Quantum Randomness" is not Turing computable. In 2013, academic scientist R.A. Fiorini confirmed Newman, Lachmann and Moore's result, creating analogous example for 2-D signal (image), as an application of CICT in pattern recognition and image analysis. Paradoxically if you don’t know the code used for the message you can’t tell the difference between an information-rich message and a random jumble of letters. This is an entropy conundrum to solve. Even the most sophisticated instrumentation system is completely unable to reliably discriminate so called "random noise" from any combinatorically optimized encoded message, which CICT called "deterministic noise". Entropy fundamental concept crosses so many scientific and research areas, but, unfortunately, even across so many different disciplines, scientists have not yet worked out a definitive solution to the fundamental problem of the logical relationship between human experience and knowledge extraction. So, both classic concept of entropy and system random noise should be revisited deeply at theoretical and operational level. A convenient CICT solution proposal will be presented
Cosmic rays: direct measurements
This paper is based on the rapporteur talk given at the 34
International Cosmic Ray Conference (ICRC), on August 6, 2015. The
purpose of the talk and paper is to provide a summary of the most recent
results from balloon-borne and space-based experiments presented at the
conference, and give an overview of the future missions and developments
foreseen in this field.Comment: Write-up of the rapporteur talk given at the 34th International
Cosmic Ray Conference, 30 July-6 August, 2015, The Hague, The Netherlands. 24
pages , 11 figure
Hybrid reduced-order modeling and particle-Kalman filtering for the health monitoring of flexible structures
MEMS-based, surface-mounted structural health monitoring systems were recently proposed to locate possible damage events in lightweight composite structures. To track the structural dynamics induced by the external actions and identify in real-time the inception of drifts from the virgin, or undamaged state, recursive Bayesian filters are here adopted. As the main drawback of any on-line identification method might be linked to the excessive computational costs, two solutions are jointly enforced: an order-reduction of the numerical model used to track the structural behavior, through the proper orthogonal decomposition in its snapshot-based version; an improved particle filtering strategy, which features an extended Kalman updating of each evolving particle before the resampling stage. While the former method alone can reduce the number of effective degrees-of-freedom of the structure to a few only (depending on the excitation), the latter allows to track the evolution of damage and also locate it thanks to an intricate formulation. To assess the proposed procedure, the case of a thin plate subject to bending is investigated; it is shown that, when the procedure is fed by measurements gathered by a network of inertial MEMS sensors appropriately deployed over the plate, damage is efficiently and accurately estimated and located
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