1,547 research outputs found

    STABILOMETRY APPLIED ON THE ANALYSIS OF INDIVIDUAL TECHNIQUE IN THE AIR - RIFLE SHOOTING

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    The main problem of sport technique in shooting sports is to maintain the body segments as stable as possible. Experimental data proved that shooters adopt a mechanically unstable posture as consequence of the interactions among body segments. Stabilometric analysis, by means of force plates, allows the evaluation of postural stability, measuring displacements of the center of pressure (COP). In this study the postural stability of a high level air - rifle shooter and its relationship with performance has been evaluated. The results confirmed that it is possible to obtain relevant information with respect to shooter's technique, given that, the shooter displayed a trend to achieve better shots trying to intercept the center of the target with moving the whole body – rifle system forwards (

    STABILOMETRY APPLIED ON THE ANALYSIS OF INDIVIDUAL TECHNIQUE IN THE AIR - RIFLE SHOOTING

    Get PDF
    The main problem of sport technique in shooting sports is to maintain the body segments as stable as possible. Experimental data proved that shooters adopt a mechanically unstable posture as consequence of the interactions among body segments. Stabilometric analysis, by means of force plates, allows the evaluation of postural stability, measuring displacements of the center of pressure (COP). In this study the postural stability of a high level air - rifle shooter and its relationship with performance has been evaluated. The results confirmed that it is possible to obtain relevant information with respect to shooter's technique, given that, the shooter displayed a trend to achieve better shots trying to intercept the center of the target with moving the whole body – rifle system forwards (

    Laparoscopic image analysis for automatic tracking of surgical tools

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    Laparoscopy is a surgical technique nowadays embedded in the clinical routine. Recent researches have been focused on analysing video information captured by the endoscope for extracting cues useful for surgeons, such as depth information. In particular, the 3D pose estimation of the surgical tools presents three important added values: (1) to extract objective parameters for the surgical training stage, (2) to develop an image-guided surgery based on the knowledge of the surgery tools localization, (3) to design new roboticsystems for an automatic laparoscope positioning, according to the visual feedback. Tool’s shape and orientation in the image is the key to get its 3D position. This work presents an image analysis for automatic laparoscopic tool’s detection along the recorded video without extra tool markers, using an edges detection strategy. Also, this analysis includes a previous stage of barrel distortion correction for videoendoscopic image

    Dynamics of roughness and surface reactions at solid electrodes

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    Surface disorder and random roughness of electrode surfaces are discussed in terms of Euclidean and fractal models. Roughness development at different metals results from two contributions operating in opposite directions, namely shadowing between growing clusters which leads to rough surfaces, and surface diffusion phenomena which tend to smooth surface irregularities. The second contribution depends on the specific mobility of the deposited metal atoms, the temperature, and the electrolyte composition. Monte Carlo simulations based upon nucleation and growth models show that the growth processes controlled by either surface reactions or mass transport of reacting species, including surface diffusion, produce compact deposits with a weak surface disorder. Conversely, the growth process under mass transport control involving a negligible surface diffusion generates open structures with a strong surface disorder. Rough metal deposits exhibiting a fractal behaviour are considered. The fractal dimension provides a quantitative description of the degree of disorder, the growth mechanism and the reactivity of those surfaces in relation to electrocatalysis.Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicada

    Swelling of Natural Soil Subjected to Acidic and Alkaline Contamination

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    This paper aims at establishing the influence of acidic and alkalinepore fluids on the swell behaviour of an expansive soil. Aseries of laboratory one dimensional free swell tests were performedto study the behaviour of soil in acidic and alkaline environment.Three different concentrations of sodium hydroxide andsulphuric acid solutions were used as pore fluids to understandthe influence of variable concentrations on the swell behaviourof soil. Results showed that, the swelling of soil that interactedwith sodium hydroxide solution initially increased at lower concentrationand then decreased with increase in concentration.In contrast, the swelling initially decreased at lower concentrationof sulphuric acid and then increased with increase inconcentration of solution. The complexity in the swell behaviourof contaminated soil was assessed by thoroughly investigatingthe mineralogy and microstructure alterations by carrying outX-ray diffraction analysis, Scanning electron microscopy andEnergy dispersive analysis of X-ray at the end of interaction

    Geomagnetic storm effects on GPS based navigation

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    The energetic events on the sun, solar wind and subsequent effects on the Earth's geomagnetic field and upper atmosphere (ionosphere) comprise space weather. Modern navigation systems that use radio-wave signals, reflecting from or propagating through the ionosphere as a means of determining range or distance, are vulnerable to a variety of effects that can degrade the performance of the navigational systems. In particular, the Global Positioning System (GPS) that uses a constellation of earth orbiting satellites are affected due to the space weather phenomena. <br><br> Studies made during two successive geomagnetic storms that occurred during the period from 8 to 12 November 2004, have clearly revealed the adverse affects on the GPS range delay as inferred from the Total Electron Content (TEC) measurements made from a chain of seven dual frequency GPS receivers installed in the Indian sector. Significant increases in TEC at the Equatorial Ionization anomaly crest region are observed, resulting in increased range delay during the periods of the storm activity. Further, the storm time rapid changes occurring in TEC resulted in a number of phase slips in the GPS signal compared to those on quiet days. These phase slips often result in the loss of lock of the GPS receivers, similar to those that occur during strong(>10 dB) L-band scintillation events, adversely affecting the GPS based navigation

    Theoretical density functional study of substituted dioxanes: trans 3,6-dimethoxy-1,2-dioxane

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    A theoretical Density Functional study of the trans-3,6-dimethoxy-1,2-dioxane molecule is performed with the purpose to analyze different conformational features.The energetic stability of the different isomers is discussed in terms of several electronic factors. Results are compared with previous semiempirical studies and they are discussed in a comparative fashion. Final results show that ab initio studies allow one to overcome some drawbacks derived from the semiempirical techniques.Centro de Química Inorgánic
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