1,721,207 research outputs found
Contractional and extensional tectonics along the transect Lake Trasimeno-Pesaro (Central Italy). In: Boriani et al.(EDS), Italian Mid-Term Conference on the Lithosphere Program. Rome, 5-6 May 1987. ATTI CONV. LINCEI, 80,177-194.
No full textAcoustical parameters for learning in classroom: A review
No full textA review on the reference values of the acoustical parameters that have the greatest influence on students' performance at different ages has been completed in this study. Published studies from 2002 to 2020 were summarized, which focus on testing learning attainments and cognitive skills, speech intelligibility, and subjective perceptions under different classroom acoustic conditions. Only 38 papers out of the 56 containing empirical findings on the influence of acoustical parameters on students’ performance were considered, as the remaining 18 lacked ecological validity or did not respond to the selection criteria. Studies were only included if they considered normal hearing subjects and typical lesson settings provided in classrooms without an amplification system. Thus, the studies selected involved subjects between 5 and 40 years old. The values of the acoustical parameters that led to better or worse learning performance were tabulated and the distribution of occurrences was created. The median and interquartile range for the distribution of occurrences were used to describe the central tendency and dispersion and analyzed considering two different age groups. The results obtained were used to develop classroom acoustic guidelines for better learning performance for students under or over 12 years of age, and identified the thresholds that lead to worse performances
Depth Self-Supervision for Single Image Novel View Synthesis
Full text linkIn this paper, we tackle the problem of generating a novel image from an arbitrary viewpoint given a single frame as input. While existing methods operating in this setup aim at predicting the target view depth map to guide the synthesis, without explicit supervision over such a task, we jointly optimize our framework for both novel view synthesis and depth estimation to unleash the synergy between the two at its best. Specifically, a shared depth decoder is trained in a self-supervised manner to predict depth maps that are consistent across the source and target views. Our results demonstrate the effectiveness of our approach in addressing the challenges of both tasks allowing for higher-quality generated images, as well as more accurate depth for the target viewpoint
Numerical determination of safety valve efficiencies
No full textBased on observed thrust and flow volume profiles as a function of the lift in closure and nozzle assemblies of known geometry, the flow volume can easily be determined for variation in pressure for a safety valve with a geometrically similar closure and nozzle of any size, combined with a spring of any prestress and rigidity. The outflow conditions and the spring capacity are considered, starting with a non-dimensional evaluation in order to generalize the problem. The resulting program permits calculation of the operating characteristics of a safety valve of specific properties under set operating conditions, in only a few minutes, even using a medium capacity computer. (R.H.
Forecastings the performance of safety valves
No full textThe experimental profiles of the thrust from the fluid on the valve shutter and of the gate outlet flow volume on variation in the shutter height can be generalized to geometrically similar valves. Three sets of experiments confirm the viability of the numerical method for forecasting the practical performance of safety valves. But the profile experimental diagram has to be supplemented by the pressure flow volume diagram based on the spring rigidity and prestress, the nature of the fluid, the upstream temperature and the downstream pressure. Then the calculation procedure can be extremely rapid, and the functional parameters influencing the behaviour of a valve can undergo controlled variation to determine the performance data
Implementation of fuel film compensation algorithm on the Lamborghini diablo 6.0 engine
No full textThis paper presents the experimental work and the results obtained from the implementation of a transient fuel compensation algorithm for the 6.0-liter V12 high-performance engine that equips the Lamborghini Diablo vehicles. This activity has been carried out as part of an effort aimed at the optimization of the entire fuel injection control system. In the first part of the paper the tests for fuel film compensator identification are presented and discussed. In this phase the experimental work has been conducted in the test cell. An automatic calibration algorithm was developed to identify the well-known fuel film model X and τ parameters, so as to define their maps as a function of engine speed and intake manifold pressure. The influence of engine coolant temperature has been investigated separately; it will be soon presented together with the air dynamics compensation algorithm. In the second part of the paper, the performance of the fuel dynamics compensation algorithm is analyzed. The measured Air-Fuel Ratio (AFR) distribution, especially during selected portions of the USA driving cycle, has been chosen as a yardstick to evaluate the performance improvement of the new injection control strategy. The experimental tests have been conducted using Lamborghini's chassis dynamometer laboratory. The comparison between the AFR values, measured before and after the introduction of the new strategy using a linear oxygen sensor, clearly shows the efficiency gain in terms of AFR control due to the transient fuel compensation algorithm. Copyright © 2001 Society of Automotive Engineers, Inc
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
