Thermo-formation process of plastic shells for winter sport boots for improved comfort     

Martino Colonna  Nicola Pazi  Matteo Moncalero  Claudio Gioia  Federico De Bon  Davide Giovanelli  Elisabetta Farella 《Sports Engineering》2017,20(4):275-282

We have performed a study on the thermo-formation process of plastic shells of boots for winter sports. The aim of the work has been to determine how the process parameters can improve the ergonomic and thermal comfort for athletes and winter sports participants. We have found that the initial deformation and memory effect are strongly influenced by the type of thermoplastic material used, heating time and cooling procedure. We have also found that the ovens currently used for this process are not correctly designed to obtain an efficient heat transfer and, therefore, a heating time of at least 12 min is necessary to achieve an average deformation of more than 2 mm. The measure of the boot flexural stiffness has shown that there are no changes in the load–deflection behavior after the thermo-formation process of a ski boot made of thermoplastic polyurethane. We have also found that the thermo-formation process decreases the pressure on skier’s feet of more than five times and, therefore, improves the comfort of the skier.  相似文献   

Art collections and taste in the Spanish <Emphasis Type="Italic">Siglo</Emphasis><Emphasis Type="Italic">de Oro</Emphasis>     

Federico Etro  Elena Stepanova 《Journal of Cultural Economics》2017,41(3):309-335

We analyze art pricing in a unique dataset on Madrid inventories between 1600 and 1750. We estimate a price index for the Spanish art market that is used for a general historical analysis of art during this period, showing a large increase in the real price of paintings during the XVII century. Then we examine the price differential between domestic and foreign paintings: At the beginning of the century domestic production was priced substantially below imported paintings, but the price gap was gradually reduced during the century. We argue that such a price convergence was not the fruit of variations in real exchange rate, relative supply or home bias, but was associated with increasing prices for the new domestic painters of the XVII century. Increasing remuneration for painting may have induced artistic innovations by domestic producers and created the conditions for the development of the Siglo de Oro of Spanish art.  相似文献   

Verification of the stomatal conductance of Nebbiolo grapevine     

Stefania PRINO  Federico SPANNA  Claudio CASSARDO 《重庆大学学报(英文版)》2009,8(1):17-24

Wine is one of the most important Italian export products, and Nebbiolo is one of the most respected Italian grapes. In the summer of 2007, a measurement campaign was carried out in a Nebbiolo vineyard located in Vezza d＇Alba, near Cuneo, Italy. Using a gauge of trade gases and some other instruments, we recorded the stomatal conductance and also some physiological parameters useful for estimating the dependence of stomatal conductance on environmental variables. The goal of this experiment was improving the parameterization of grapevine evapotranspiration through the assessment of the stomatal conductance and, in particular, of the functional dependence of the stomatal conductance on the following variables： the photosynthetically active radiation, the atmospheric temperature, the atmospheric moisture deficit, and the carbon dioxide concentration. The observations allowed us to check and, in some cases, to adapt the existing general parameterizations found in literature. The results showed some significant differences with the existing parameterizations concerning the atmospheric temperature, the atmospheric moisture deficit, and the carbon dioxide concentration. The parameterizations obtained in this experiment, although referring to a specific plant and site （namely the Nebbiolo at Vezza d＇Alba）, could allow assessment of the best environmental conditions under which the Nebbiolo grapevine production is the best, and in future could be tested for other grapevines or climates.  相似文献   

Timing with opportunity cost: Concurrent schedules of reinforcement improve peak timing     

Federico Sanabria  Eric A. Thrailkill  Peter R. Killeen 《Learning & behavior》2009,37(3):217-229

The temporal generalization gradient produced by the peak-interval (PI) procedure reflects behavior under the control of positive reinforcement for responding after the criterial time, but shows negligible discouragement for early responses. The lack of consequences for premature responding may affect estimates of timing accuracy and precision in the PI procedure. In two experiments, we sought to encourage more accurate timing in pigeons by establishing an opportunity cost for such responding. Concurrent ratio and interval schedules of reinforcement reduced the dispersion of keypecking around the target time. A sequence of three response-rate states (low-high-low) characterized performance in individual trials. Opportunity cost substantially reduced the mean and standard deviation of the duration of the middle-high state that typically enveloped the target time, indicating improved temporal acuity. We suggest a model as a first-order approximation to timing with opportunity cost.  相似文献   

A triad of Filipino adolescents’ zones of lived experiences of information and communications technology (ICT)     

Allan B. de Guzman  Federico B. Fabian 《Educational Research for Policy and Practice》2009,8(1):23-34

Considering that today’s students feel extremely more comfortable with computers than did earlier generations of students vis-à-vis the notion that, as a social category, they have become one of the most interesting topics in research papers and journals in the field of behavioral and social sciences since the 1950s (Batan 2002), their individual and collective experiences of information and communications technology (ICT) could be expected to create a portrait of accounts that might inform educational policy makers as to how their ICT needs and concerns could be better addressed through a more responsive and a well-defined IT-driven educational platform. The central question that this phenomenological study purported to answer was: “How does a select group of Filipino adolescents collectively experience information and communications technology (ICT)?” Findings of this study revealed that the individual and collective articulations, verbalizations, and musings of the 60 adolescents recruited from two regions in the Philippines exposed three distinct but interrelated conceptual zones of ICT, namely: the zone of technology perspective (ZTP), zone of technology power and efficacy (ZTPE), and zone of technology deficits (ZTD). Implications of the study are also discussed in the paper. “There is a demand for qualitative research with an insider perspective, as young voices appear not to have been sufficiently heard.” (Hauan and Heggli 2002:13)   相似文献   

Late Emergence of the First Possession Heuristic: Evidence From a Small‐Scale Culture          下载免费PDF全文

Patricia Kanngiesser  Federico Rossano  Michael Tomasello 《Child development》2015,86(4):1282-1289

Western preschool children often assign ownership based on first possession and some theorists have proposed that this judgment might be an early emerging, innate bias. Five‐ to 9‐year‐olds (n = 112) from a small‐scale group in Kenya (Kikuyu) watched videotaped interactions of two women passing an object. The object's starting position and the women's gestures were varied. Use of the first possession heuristic increased with age, and 8‐ to 9‐year‐olds performed similarly to German 5‐year‐olds (n = 24). Starting position and gestures had no effect. A control study confirmed that 5‐year‐old Kikuyus (n = 20) understood the video material. The findings reveal that the first possession heuristic follows different developmental trajectories cross‐culturally and stress the role of children's sociocultural environment.  相似文献   

Interval timing under a behavioral microscope: Dissociating motivational and timing processes in fixed-interval performance     

Carter W. Daniels  Federico Sanabria 《Learning & behavior》2017,45(1):29-48

The distribution of latencies and interresponse times (IRTs) of rats was compared between two fixed-interval (FI) schedules of food reinforcement (FI 30 s and FI 90 s), and between two levels of food deprivation. Computational modeling revealed that latencies and IRTs were well described by mixture probability distributions embodying two-state Markov chains. Analysis of these models revealed that only a subset of latencies is sensitive to the periodicity of reinforcement, and prefeeding only reduces the size of this subset. The distribution of IRTs suggests that behavior in FI schedules is organized in bouts that lengthen and ramp up in frequency with proximity to reinforcement. Prefeeding slowed down the lengthening of bouts and increased the time between bouts. When concatenated, latency and IRT models adequately reproduced sigmoidal FI response functions. These findings suggest that behavior in FI schedules fluctuates in and out of schedule control; an account of such fluctuation suggests that timing and motivation are dissociable components of FI performance. These mixture-distribution models also provide novel insights on the motivational, associative, and timing processes expressed in FI performance. These processes may be obscured, however, when performance in timing tasks is analyzed in terms of mean response rates.  相似文献   

A Global Culture of Peace: Transmission and Ethical Dimensions     

Federico Mayor 《Higher Education in Europe》2004,29(4):491-494

The author considers in this article the ethical boundaries of knowledge, the challenges inherent in the improvement of international ethical and legal frameworks, and some of the ethically important moments of the past half‐century. Implications for higher education in the context of globalization are also considered, as are some of the new educational requirements of the knowledge‐driven economy and society.  相似文献   

The ‘Nature of Science’ and the Perils of Epistemic Relativism     

Romero-Maltrana  Diego  Benitez  Federico  Vera  Francisco  Rivera  Rodrigo 《Research in Science Education》2019,49(6):1735-1757

Research in Science Education - There is an increasing demand in the field of science education for the incorporation of philosophical and sociological aspects that are related to the scientific...  相似文献   

Reading Aloud Narrative Material as a Means for the Student's Cognitive Empowerment     

Marco Bartolucci  Federico Batini 《Mind, Brain, and Education》2020,14(3):235-242

Listening to stories and brain processing of narrative material activates many areas devoted not only to the linguistic processing. In this sense, it could be hypothesized that if this activity would be integrated within the school curricula, it could bring benefits in terms of understanding the text as well as in basic essential cognitive dimensions. In a series of studies with different age groups, we investigated the effects of an intensive training in narrative listening, through different tools such as the standardized tests of understanding of the text. We also used a neuropsychological battery investigating basic cognitive processes (cognitive assessment system) that are directly related to the ability of text comprehension. Results show a significant improvement in all tests for all age groups in the experimental groups, in comparison with the control groups.  相似文献