1,354,842 research outputs found
Synthesis of indoor maps in presence of uncertainty
No full textA robotic system is presented, which is able to autonomously explore unengineered indoor environments, thereby synthesizing maps suitable for planning and navigation purposes. Map recovery takes place through interaction between the robot and the world, in which either sensing and acting are affected by uncertainty. Kalman filtering is applied to maintain position best estimates, which are then fused with data coming from the observation of landmarks.
The proposed method has been implemented on a robot equipped with ultrasonic range finders, and tested in a fairly simple, real environmen
En torno a la evolución del cinematógrafo
No full textLa Revista del Colegio Mayor de Nuestra Señora del Rosario se permite hacer publicación del artículo de la autoría de Margarita Abella Caprile acerca de la trayectoria evolutiva de la cinematografía
Gènere i ciència, equitat i exel·lència en el coneixement científic
No full textIntervenció de María Caprile, sociòloga i Directora de recerca de la Fundació CIREM (Centre d'Iniciatives i Recerques Europees a la Mediterrània), sobre la presència de les dones en l'àmbit educatiu i científic996.mp4
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SIPCyT y el acceso digital a la producción intelectual de los investigadores de la Facultad de Ciencias Naturales y Museo
No full textFil: Miguel, Sandra. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.Fil: Caprile, Lorena. Universidad Nacional de La Plata. Facultad de Naturales y Museo. Biblioteca Florentino Ameghino
Prefazione a "In viaggio con i poeti. Dal paesaggio alla lingua e ritorno. Panorami e scrittori per imparare l'italiano".
No full textIntroduzione al libro "In viaggio con i poeti. Dal paesaggio alla lingua e ritorno. Panorami e scrittori per imparare l'italiano" di Maria Teresa Caprile
Broadband characterization and time-resolved nanosecond magneto-optics of thin magnetic films
No full textIn the field of magnetic devices as in all the fields related to information technology and electronics the demand for a higher clock rate and faster device operations is continuously increasing. In data storage, the effort to reach the
highest information density is leading to the usage of patterned films having micrometer and sub-micrometer features. Both data storage and telecommunication
fields are focusing on the magnetization switching behavior at the highest attainable frequency. For data storage it is necessary to obtain a high read/write speed, while for telecommunications a magnetization switching
in the sub-nanosecond range is important due to the equivalence with wave propagation frequencies in the GHz range, where current technologies operate.
Most investigations in these fields have been performed up to now in the frequency domain, where important results have been obtained starting from the identification of the ferromagnetic resonance and spinwave modes.
Ultra fast magnetization dynamics on the nano- and picosecond time scale thus plays and will continue to play an important role for a large variety of present and future applications of magnetic nanostructures. At this time scale,
magnetization dynamics is dominated by the damped precessional motion of the magnetization about the acting internal and external fields. It is usually described by the Landau-Lifshitz-Gilbert equation, the two main parameters
involved in it being the ferromagnetic resonance frequency and the phenomenological Gilbert damping parameter .
Very different requirements on the FMR frequency and the Gilbert damping parameter have to be met for different technological applications: microwave absorbers based on ferromagnetic nanoparticles require large damping,
whereas in general all applications related to memory storage require a very low Gilbert damping . For fast sensors or spin transfer torque memory cells the dynamical properties of the magnetic devices must be precisely matched to the specific application.
In ferromagnetic resonance experiments, forced precession oscillations of the magnetization are excited by means of a high-frequency magnetic field, which is provided either by a Vector Network Analyzer (VNA), which performs a frequency sweep at a fixed external magnetic eld and returns scattering
parameters from which the complex magnetic permeability component can be obtained, or by means of a microwave oscillator, in a setup called field-sweep FMR where the same information about complex permeability are obtained through a varying magnetic field, the oscillator providing a fixed frequency signal.
If, instead of the ac field, a dc step pulse field is applied, free precession oscillations are excited, which then decay under the damping action of eddy currents and spin relaxation mechanisms. This is what is referred to as Pulsed
Inductive Microwave Magnetometer (PIMM), i.e. to a setup where the waveguide is used both as a source of fast pulsed magnetic fields and as an inductive flux sensor. The pulses are provided by a pulse generator, and a 20 GHz digital
sampling oscilloscope is used to acquire the fast pulse data. The system provides direct information on the dynamical behavior of the magnetization as a function of several variables, including applied magnetic bias field, magnetic
pulsed field amplitude and width, and sample orientation.
This thesis work is devoted to the experimental broadband investigation of several types of thin plates, films and multilayer samples in a wide frequency range, from DC up to several tens of GHz, and to the physical interpretation of
the material behavior upon such a wide frequency range and in particular to the development of experimental setups for the aforementioned characterizations
Environmental and Mechanical Fatigue of Wind Turbine Blades Made of Composites Materials
No full text The problem relevant to fatigue design and analysis of wind turbine blades made of composite materials is faced; mid-size single-blade wind turbine is taken into consideration. Static and fatigue load conditions are defined; hygrothermal conditions are identified as well, in terms of yearly statistical distribution of wind speed and air temperature, relative humidity, solar radiation and atmospheric pressure daily variations, the occurrence of low-energy impacts due to hailstones is also considered. A FEM structural analysis is carried out to compute stress and strain distributions all along the blade: hot spots are identified; the stress critical values, along with fatigue spectra, are used to design fatigue tests. Some preliminary tests are performed on composite specimens previously dry and wet conditioned, as well as on low-energy impacted coupons, considering both mechanical and hygrothermal effects; finally some preliminary fatigue tests on both adhesive and riveted composite joints are carried out. </jats:p
Model selection for power efficient analysis of measurement data
No full textIn this work a novel analysis methodology of SVMs optimal solutions is presented. Such a methodology is based on a multiobjective optimization algorithm which exploits a genetic search paradigm. The application field is the design of smart micro-sensors, where both classification performance and complexity criteria have to be considered in order to balance accuracy and power consumption requirements
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