1,623 research outputs found
Identification of Test Structures for Reduced Order Modeling of the Squeeze Film Damping in Mems
In this study the dynamic behaviour of perforated microplates oscillating
under the effect of squeeze film damping is analyzed. A numerical approach is
adopted to predict the effects of damping and stiffness transferred from the
surrounding ambient air to oscillating structures ; the effect of hole's cross
section and plate's extension is observed. Results obtained by F.E.M. models
are compared with experimental measurements performed by an optical
interferometric microscope.Comment: Submitted on behalf of EDA Publishing Association
(http://irevues.inist.fr/EDA-Publishing
A Cognitive Social IoT Approach for Smart Energy Management in a Real Environment
Energy usage inside buildings is a critical problem, especially considering high loads such as Heating, Ventilation and Air Conditioning (HVAC) systems: around 50% of the buildingsâ energy demand resides in HVAC usage which causes a significant waste of energy resources due to improper uses. Usage awareness and efficient management have the potential to reduce related costs. However, strict saving policies may contrast with usersâ comfort. In this sense, this paper proposes a multi-user multi-room smart energy management approach where a trade-off between the energy cost and the usersâ thermal comfort is achieved. The proposed user-centric approach takes advantage of the novel paradigm of the Social Internet of Things to leverage a social consciousness and allow automated interactions between objects. Accordingly, the system automatically obtains the thermal profiles of both rooms and users. All these profiles are continuously updated based on the system experience and are then analysed through an optimization model to drive the selection of the most appropriate working times for HVACs. Experimental results in a real environment demonstrated the cognitive behaviour of the system which can adapt to usersâ needs and ensure an acceptable comfort level while at the same time reducing energy costs compared to traditional usage
Chiral Properties of QCD Vacuum in Magnetars- A Nambu-Jona-Lasinio Model with Semi-Classical Approximation
The breaking of chiral symmetry of light quarks at zero temperature in
presence of strong quantizing magnetic fiels is studied using
Nambu-Jona-Lasinio (NJL) model with Thomas-Fermi type semi-classical formalism.
It is found that the dynamically generated light quark mass can never become
zero if the Landau levels are populated and the mass increases with the
increase of magnetic field strength.Comment: REVTEX 11 Pages, One .eps figure (included
Comparison between piezoelectric and magnetic strategies for wearable energy harvesting
This paper introduces the design and fabrication of energy harvesters for the power
generation from human body motion. Two alternative strategies are compared: piezoelectric
and magnetic inductive. The generated energy is used to supply body sensors including
accelerometers and temperature sensors and RF module. Two prototypes of the magnetic based
generator and of the piezoelectric generator are built and tested with shaker at resonance
condition and by dedicated bench reproducing joints rotation during walking. The experimental
results show that the magnetic prototype can generate 0.7mW from human body motion, while
the piezo harvester generates 0.22 and 0.33ÎŒW respectively for flexion and extension at
angular velocity lower than 1rad/s and 45° amplitude
Gravitational collapse due to dark matter and dark energy in the brane world scenario
Gravitational collapse of FRW brane world embedded in a conformaly flat bulk
is considered for matter cloud consists of dark matter and dark energy with
equation of state . The effect of dark
matter and dark energy is being considered first separately and then a
combination of them both with and without interaction. In some cases the
collapse leads to black hole in some other cases naked singularity appears.Comment: 10 Latex Pages, RevTex style, 4 figure
Resonate and fire dynamics in Complex Oscillation Based Test of analog filters
Recently, proposals have been made for enhancing the Oscillation Based Test (OBT) methodology by using non-plain oscillation regimes, leading to so called Complex Oscillation Based Test (COBT). Here we focus on a recently illustrated strategy for the testing of analog 2nd order filters, showing that the COBT dynamics is quite similar to that expressed by Resonate & Fire (R+F) neuron models. In this interpretation, the testing approach can be related to firing-rate measures. A brief description is given of the mathematical models necessary to achieve a precise characterization of firing times, showing how it can be used for testing purposes. A practical example with simulation data is also provided. © 2011 IEEE
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