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排序方式: 共有137条查询结果,搜索用时 15 毫秒
111.
Mariacristina Cocca Lucia D'Arienzo Loredana D'Orazio Gennaro Gentile Carlo Mancarella Ezio Martuscelli Carmen Polcaro 《Journal of Cultural Heritage》2006,7(4):236-243
With the aim of identifying new water dispersed polymers for textile conservation, the structure and properties of three commercial polyacrylates and one commercial polyvinylacetate were analysed. The characteristics of these materials, not previously used in the conservation and restoration fields, were compared with that shown by Primal AC33 and Mowilith DMC2 and SDM5, widely used as consolidating or adhesive agents of ancient textiles. To achieve a thorough characterisation of each polymer, molecular, thermal, structural and mechanical investigation techniques were applied on film samples, obtained from polymer water dispersions through water casting at room temperature and/or compression moulding. The photo-oxidative resistance of these materials was also assessed by artificial weathering of water cast films and by measuring the Yellowing Index (YI) as a function of the exposure time under xenon-arc lamp. Collected data were used to appropriately compare the performances shown by these polymers when applied on artefacts consisting of natural fibres. In particular it was found that, among the products not previously used in the conservation and restoration fields, a high potential for carrying out treatments on textiles is shown by the samples commercialised with the trade names of Acrilem RP6005 and Acrilem 30WA. These products, in fact, exhibit properties that make them suitable as substitutes for Primal AC33 and Mowilith DMC2 and SDM5, respectively, depending upon conservation needs. It was very interesting to note that Acrilem 30WA, also after aging, shows YI values lower than that shown by Mowilith DMC2 and SDM5. 相似文献
112.
Juliano Fernandes-da-Silva Carlo Castagna Anderson Santiago Teixeira Lorival José Carminatti Luiz Guilherme Antonacci Guglielmo 《Journal of sports sciences》2016,34(24):2238-2245
ABSTRACTThe aim of this study was to examine the relationship between the peak velocity derived from the Carminatti Test (T-CAR) (PVT-CAR) and physical match performance in young soccer players. Thirty-three youth soccer players were recruited from 2 non-professional clubs. Friendly matches and small-sided game were performed. Physical match demands were assessed using Global Positioning System (GPS) technology. On a separate occasion, the players were submitted to the T-CAR. Players were categorised into 3 groups based on their T-CAR performance: Low (PVT-CAR ≤ P33), Intermediate (P33 > PVT-CAR < P66) and High (PVT-CAR ≥ P66). The PVT-CAR (15.5 ± 0.7 km·h?1) was significantly related to high-intensity activities (HIA; r = 0.78, P < 0.001), high-intensity running (HIR; r = 0.66, P < 0.001), sprinting (r = 0.62, P < 0.001) and total distance (TD) covered (r = 0.47, P < 0.01) during friendly matches. The PVT-CAR was strongly correlated with the amount of HIA (r = 0.81, P < 0.001), HIR (r = 0.85, P < 0.001) and TD covered (r = 0.81, P < 0.001) during small-sided game. No significant correlation was observed between the PVT-CAR and distance of sprinting (r = 0.49, P = 0.067) during small-side game. Furthermore, players in the High group covered significantly more TD (10%) and did more HIA (42%), sprinting (31%) and HIR (25%) during friendly matches compared to the players classified as having Low performance on the T-CAR. These differences still remained after adjusting for chronological age (CA), maturity and body size. In conclusion, the current study gives empirical support to the ecological and construct validity of this novel field test (T-CAR) as an indicator of match-related physical performance in young soccer players during pubertal years. 相似文献
113.
The Relations of Maternal Practices and Characteristics to Children''s Vicarious Emotional Responsiveness 总被引:1,自引:0,他引:1
Nancy Eisenberg Richard A. Fabes Gustavo Carlo Debra Troyer Anna Lee Speer Mariss Karbon Galen Switzer 《Child development》1992,63(3):583-602
This study examined the relations of maternal vicarious emotional responding and child-rearing practices, as well as familial emotional environment, to 5-6 and 8-9-year-old children's vicarious emotional responding. There were some correspondences between mothers' and children's heart rate, facial, and self-reported reactions to a sympathy-inducing film. Maternal sympathy/perspective taking and reinforcement of sympathy/prosocial behavior, as well as negative subordinate emotion in the home, were associated with markers of girls' sympathy; mothers' personal distress (for girls), restrictiveness regarding displays of hurtful negative emotions (particularly for young girls), and negative dominant emotion in the home (for both sexes) were associated with markers of personal distress. Mothers' linking of the film character's experience to children's own experience was associated with children's responsiveness to the film, and mother's verbalizations during the film concerning her own emotional state and role taking were associated with boys' self-reported sympathy. 相似文献
114.
Carlo Ambrogi Lorenzini Corrado Bucherelli Aldo Giachetti Giovanna Tassoni 《Learning & behavior》1990,18(2):191-198
The effect of tail-handling on exploratory behavior of the rat, measured as step-through latency in a well-lighted, two-box apparatus, was investigated. Male adult Wistar rats, aged 60 days, were employed in all three experiments. Experiment 1, in which the subjects were handled at different times after entering the goal chamber (0, 10, 30, 60, 300, and 600 sec), showed that immediate handling, relative to detention in the goal chamber (delay of handling) had an inhibitory effect on exploration. Experiment 2 showed that groups handled immediately after entering the goal chamber but then detained there for different durations all showed the same progressive inhibition of exploration. Experiment 3 showed that the inhibition of exploration (very long step-through latencies) due to tail-handling immediately after entering the goal chamber could be significantly decreased by further trials in which handling was delayed for a sufficient duration (30 sec or more). Handling is discussed as a stimulus that is aversive enough to elicit conditioned passive-avoidance responses (inhibition of exploratory behavior), although it is subject to rapid extinction. 相似文献
115.
116.
The analysis of a certain number of textbooks on Thermodynamics is expounded with the aim of showing that several mental representations of this subject matter are present in scientific literature. This analysis points out divergent attitudes not only towards the definition of fundamental concepts principles, but also towards the epistemological status of Thermodynamics. These attitudes underlie-sometimes tacitly-the relationship between the macroscopic and the microscopic approach on one side and between the state or process approach on the other. We also show the importance of both the historical reconstruction and the epistemological analysis for a deeper understanding of what these different mental representations underlie and entail. 相似文献
117.
The importance of shared environment in mother-infant attachment security: a behavioral genetic study 总被引:1,自引:0,他引:1
Bokhorst CL Bakermans-Kranenburg MJ Fearon RM van IJzendoorn MH Fonagy P Schuengel C 《Child development》2003,74(6):1769-1782
In a sample of 157 monozygotic and dizygotic twins, genetic and environmental influences on infant attachment and temperament were quantified. Only unique environmental or error components could explain the variance in disorganized versus organized attachment as assessed in the Ainsworth Strange Situation Procedure. For secure versus nonsecure attachment, 52% of the variance in attachment security was explained by shared environment, and 48% of the variance was explained by unique environmental factors and measurement error. The role of genetic factors in attachment disorganization and attachment security was negligible. Genetic factors explained 77% of the variance in temperamental reactivity, and unique environmental factors and measurement error explained 23%. Differences in temperamental reactivity were not associated with attachment concordance. 相似文献
118.
Carlo Cappa 《比较教育学》2018,54(4):509-529
ABSTRACTThe aim of the article is to investigate the profile of comparative education in Italy, highlighting those elements that have characterised its development in relation to the cultural and political features of the country. This approach inevitably involves the comparison of Italy's specific particularities to those of other countries in the north and the south of Europe, in order to understand whether there are certain features that may place Italian comparative education within the wider framework of the Mediterranean area. What is involved in making a comparative analysis of the profile of a discipline and, more particularly, of comparative education in Italy, concentrating principally on the geopolitical context of its development? What is it that typifies the feature or features that make Italian comparative education quintessentially Italian? What are the main sources of comparative education in Italy, and what are the disciplines with which it continues to interact today? The article argues that in the wider framework of Western comparative education, Italy's voice, rooted in a plural tradition and open to new developments, is an original and important contribution for thinking critically this field of study. 相似文献
119.
Carlo Tomasetto 《European Journal of Psychology of Education - EJPE》2004,19(2):133-145
A recently formulated corespondence hypothesis states that influence style effectiveness depends on how it fits in with the
communication contract activated in the context of influence: almost symmetrical relationships require respectful styles,
while authoritarian styles are more effective when the social distance between the influence source and its targets is higher.
The hypothesis was applied here to the negotiation of innovative practices in educational settings. In a 2 (message style:
authoritarian vs. democratic) x 2 (targets position: not orientated vs. already orientated toward the suggested activity)
experimental design, 129 university students were presented with a bogus request, attributed to their Faculty teaching staff,
to participate in an extra-curricular activity. Dependent measures included direct agreement on the usefulness of the activity,
and a change in the declared intention to participate in it. Results partially confirm the hypothesis, as a democratic style
induces more direct agreement with the source than the authoritarian one, when the targets were already orientated toward
the activity; a complementary effect emerges, that is the authoritarian style, more than the democratic one, increases the
intention to participate in the activity by students who were not previously orientated in this direction. 相似文献
120.
BURNOUT IN SPECIAL NEEDS TEACHERS AT KINDERGARTEN AND PRIMARY SCHOOL: INVESTIGATING THE ROLE OF PERSONAL RESOURCES AND WORK WELLBEING
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Simona De Stasio Caterina Fiorilli Paula Benevene Lotta Uusitalo‐Malmivaara Carlo Di Chiacchio 《Psychology in the schools》2017,54(5):472-486
The purpose of the current study was to examine, within an integrative predictive model, the relative contributions of sociodemographic variables, personal resources, and work wellbeing to teacher burnout. The research was conducted with special education teachers at Italian preschools—a context in which few previous studies have been carried out—and primary schools. A cross‐sectional survey‐based study with a sample of 194 kindergarten and primary school teachers was conducted. The results indicated that teachers’ happiness at school and job satisfaction incrementally predicted variance in personal, work‐related, and student‐related burnout, even after controlling for the effects of sociodemographic factors and personal resources. Furthermore, the final integrative predictive model was similar for both kindergarten and primary teachers. 相似文献