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191.
Manual discrimination of force using active finger motion. 总被引:5,自引:0,他引:5
In these experiments, two plates were grasped between the thumb and forefinger and squeezed together along a linear track. An electromechanical system presented a constant resistance force during the squeeze up to a predetermined location on the track, whereupon the force effectively went to infinity (simulating a wall) or to zero (simulating a cliff). The task of the subject was to discriminate between two alternative levels of the constant resistance force (a reference level and a reference-plus-increment level). Results of these experiments indicate a just noticeable difference of roughly 7% of the reference force using a one-interval paradigm with trial-by-trial feedback over the ranges 2.5 less than or equal to F0 less than or equal to 10.0 newtons, 5 less than or equal to D less than or equal to 30 mm, 45 less than or equal to S less than or equal to 125 mm, and 25 less than or equal to V less than or equal to 160 mm/sec, where F0 is the reference force, D is the distance squeezed, S is the initial fingerspan, and V is the mean velocity of the squeeze. These results, based on tests with 5 subjects, are consistent with a wide range of previous results, some of which are associated with other body surfaces and muscle systems and many of which were obtained with different psychophysical methods. 相似文献
192.
Mg–Sn-based alloys are considered as a promising precipitation-hardening system for applications at elevated temperatures, but the hardening effect is not satisfactory owing to sluggish nucleation and rapid coarsening of the major Mg2Sn lath precipitates. In this study, Cu and Al are added to a Mg–6Sn–1Mn base alloy. The age-hardening response and the microstructures of these modified alloys have been investigated and are compared to that of the base alloy. The additional elements are found to bring several beneficial effects to the alloys for applications at elevated temperatures. Firstly, a eutectic structure consisting of strong intermetallic phases, i.e. Mg2Cu in the Mg–6Sn–1Mn–2Cu alloy and Al0.93Cu1.07Mg in the Mg–6Sn–1Mn–2Cu–2Al alloy, remains stable along the grain boundaries after solution and ageing heat treatments. Secondly, the precipitate density has been increased significantly and the precipitate size has been refined remarkably during ageing at 200?°C. Moreover, the growth of the precipitates is inhibited remarkably during the over-ageing period. Therefore, the age-hardening response and over-ageing resistance are notably improved. 相似文献
193.
王充心理学思想新论——兼议中国古代心理学思想史研究方法 总被引:1,自引:0,他引:1
本文试图寻求一种新的研究模式,来探索王充的心理学思想。这个模式主要包括两个方法论原则,即:(一)置于思想群系的原则;(二)依据自身逻辑的原则。在这一研究模式引导下,作者发现“唯实唯验”是王充心理学思想的基点。并由此推论出(一)王充心理学思想的本质是“心理即力”;(二)其特征是“心理外显”,而这两者是分别体现在他的人论和心论的思想之中。 相似文献
194.
Tan L Ward G 《Journal of experimental psychology. Learning, memory, and cognition》2000,26(6):1589-1625
Seven experiments investigated the role of rehearsal in free recall to determine whether accounts of recency effects based on the ratio rule could be extended to provide an account of primacy effects based on the number, distribution, and recency of the rehearsals of the study items. Primacy items were rehearsed more often and further toward the end of the list than middle items, particularly with a slow presentation rate (Experiment 1) and with high-frequency words (Experiment 2). Recency, but not primacy, was reduced by a filled delay (Experiment 3), although significant recency survived a filled retention interval when a fixed-rehearsal strategy was used (Experiment 4). Experimenter-presented schedules of rehearsals resulted in similar serial position curves to those observed with participant-generated rehearsals (Experiment 5) and were used to confirm the main findings in Experiments 6 and 7. 相似文献
195.
Adaptation to Spanish of the Vividness of Visual Imagery Questionnaire-Revised Version (VVIQRV). The main goal of this paper was to adapt to Spanish language and to examine the psychometric properties of the "Vividness of Visual Imagery Questionnaire-Revised Version" (VVIQRV), an instrument that can be used to assess vividness of visual imagery. The adaptation was carried out starting from the Spanish version of VVIQ and taking into consideration improvement proposals suggested in other studies. The questionnaire was then administered to a sample of 414 Spanish university students and the psychometric characteristics were estimated on the basis of the classic theory and the Rasch rating scale model (RSM). The results were convergent with previous studies and indicated that the Spanish VVIQRV has good internal consistency and can be characterized by a single main factor structure. Also, the RSM analysis showed that the increment in the number of response categories, a proposal to improve the instrument, was not appropriate. 相似文献
196.
西方文明在"经济人"思想的引导下产生了工业革命,进而实现了现代化.但是,"经济人"思想的自利性,忽视了人与人、人与自然、人与社会的依存关系,使西方社会在实现物质文明的同时,产生了种种危机.而这些危机的解决有赖于一种新的伦理思想,以重新审视经济发展和人类存在的关系.佛教缘起观是一种从社会、个人和环境相互共生的视角,来看待社会发展的伦理思想,它对克服现代社会发展的各种片面性有积极的借鉴作用. 相似文献
197.
198.
大学生亲社会倾向、亲社会推理以及它们的相关模式 总被引:8,自引:0,他引:8
采用《亲社会倾向测量》和《亲社会推理客观测量》研究了17至20岁大学生的六类亲社会倾向和亲社会推理的状况。发现大学生将利他的亲社会倾向列为六类倾向中的首位,接下来依次是紧急的、情绪性的、依从的、匿名的和公开的亲社会倾向;在亲社会推理五种类型中大学生选择比率最高的是内化价值定向的推理,接下来依次是刻板定向、需要定向和享乐主义定向的推理,所占比率最低的是赞扬定向的推理;六类亲社会倾向与亲社会推理之间具有特定的棚关模式.利他的和匿名的亲社会倾向与内化价值定向和刻板定向的推理正相关、与享乐主义定向及赞扬定向的推理负相关,公开的亲社会倾向与赞扬定向的推理正相关、与需要定向的推理负相关。跨文化比较证实,中美大学生的上述三个方面表现出一定的差异。 相似文献
199.
The authors conducted an empirical study in research and development centers and research-oriented commercial companies in Singapore to test a model for understanding individuals' technical information inquiry behavior in organization settings. Individual-level antecedents (learning orientation, risk-taking propensity, and self-efficacy) and perceived contextual-level antecedents (management support, relationship quality, organizational norms favoring technical information inquiry, and accessibility of the information source) were theorized to affect one's evaluation of the potential benefits and costs in making technical information inquiries. The results showed that the perceived norms favoring technical information inquiry affected the willingness of individuals to make technical information inquiries through the mediating variable, expectancy value. In addition, compared with individual-level variables, perceived contextual-level variables explained slightly more variance in the willingness to make technical information inquiries. Theoretical and practical implications are discussed. 相似文献
200.
Research suggests that social support moderates or “buffers” the impact of stress on the individual and thus indirectly affects
emotional well-being (Cohen and Wills, 1985). The present study sought to extend the “buffering hypothesis” to competitive
sport by examining the influence of perceived coach support on competitive state anxiety among young athletes (N = 270). Results from confirmatory factor analyses (CFA) substantiated the validity of the sport-modified Social Provisions
Scale (Russell and Cutrona, 1984; Ryska and Yin, 1994). Structural equation modeling analyses revealed a significant support-anxiety
effect in the high trait-anxious model only (r =-.27, p .05). The present results suggest that perceived coach support represents an important mediating factor in the sport stress
process among highly anxious athletes. 相似文献