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本文利用同样家庭板块数据的农业生产函数证明,假如其他因素完全一样,务农效率最高的农户租种更多的耕地,而效率较低的农户会出租更多的耕地。就中国人力资本的水平而言,反过来说才是正确的,中国的人力资本日益与非农劳动力市场上更高的工资联系在一起;教育水平较高的家庭倾向出租更多的土地,而素质较低的家庭倾向于租种土地。 相似文献
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Yumiko Otsuka Yukuo Konishi So Kanazawa Masami K. Yamaguchi Hervé Abdi Alice J. O'Toole 《Child development》2009,80(4):1259-1271
This study compared 3- to 4-month-olds' recognition of previously unfamiliar faces learned in a moving or a static condition. Infants in the moving condition showed successful recognition with only 30 s familiarization, even when different images of a face were used in the familiarization and test phase (Experiment 1). In contrast, infants in the static condition showed successful recognition only when the familiarization duration was lengthened to 90 s and when the same image was used between the familiarization and test phase (Experiments 2 and 3). Furthermore, presentation of multiple static images of a face did not yield the same level of performance as the moving condition (Experiment 4). These results suggest that facial motion promotes young infants' recognition of unfamiliar faces. 相似文献
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Samuel Abramovich Christian Schunn Ross Mitsuo Higashi 《Educational technology research and development : ETR & D》2013,61(2):217-232
Educational Badges are touted as an alternative assessment that can increase learner motivation. We considered two distinct models for educational badges; merit badges and videogame achievements. To begin unpacking the relationship between badges and motivation, we conducted a study using badges within an intelligent-tutor system for teaching applied mathematics to middle-school students. Our findings indicate that badge earning could be driven by learner motivations and that systems with badges could have a positive effect on critical learner motivations. However, badge acquisition patterns were different across learners with different levels of prior knowledge. Different badge types also affected different learners motivation. Additionally, we believe that our findings are compatible with the research finding that extrinsic motivators have a negative influence on learning. The implication for educational badge designers is that they must consider the ability and motivations of learners when choosing what badges to include in their curricula. We believe our findings exist as one piece of the large research base needed to understand educational badges. 相似文献
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In this paper, the results on the stability of a weighted diamond of polynomials which was studied by Kharitonov and Tempo (Systems Control Lett. 22 (1994)) are simplified for low-order polynomials. Specifically, for n=3 and 4, the number of polynomials required to check the stability is four and six, respectively, instead of eight. Further, diamond of polynomials which were studied by Barmish et al. (IEEE Trans. Automat. Control AC-37 (9) (1992)) are also investigated. 相似文献
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墨家认为,人是追求实现自己欲求的能动性的存在,秩序不否定却利用这个欲求而得以形成。於兼爱论在追求＂利＂的过程中,通过＂利＂的交换形成秩序。於尚同论在追求＂义＂的过程中,通过对上位者＂调谐＂形成秩序。於是尚同论呈现＂专制主义＂的外貌,可是在这样的过程之中,虽然上位者也受下位者的＂规谏＂,下位者的＂义＂也不否定了。秩序肯定着各人追求欲求的行动。墨家的社会是动态的、发展的、追求进一步富裕的和谐社会。 相似文献
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将《西游记》中的“妖怪”疏理成四类,与《西游记》杂剧比较,剖析牛魔王、铁扇公主与红孩儿及镇元子等前后关系变化。深入论述镇元子、太上老君和悟空之间的恩怨纠葛,观音菩萨对孙悟空的关爱与考验,以及在《西游记》中的重要意义。从“世德堂本西游记”中土地庙大泛滥。研究齐天大圣为什么变做土地庙。作者认为《土地宝卷》对《西游记》成书有一定的影响。 相似文献
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Mitsuo Otsuka Wolfgang Potthast Steffen Willwacher Jan-Peter Goldmann Toshiyuki Kurihara Tadao Isaka 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(3):229-244
The purpose of this study was to validate the calculation of reaction time (RT) and normalised power in block starts without considering arm ground reaction forces (GRFs) or using two kinematics-only methods. The RT and normalised power in the action phase were calculated using four different methods: using GRFs of arms and legs by force plates (whole F-based method), which can be regarded as the most valid method, using GRFs of legs captured by force plates (legs F-based method), using position of the centre of mass of the entire body captured by high-speed cameras (whole P-based method), and using only a partial subset of segment position (partial P-based method). Bland–Altman plots demonstrated that the RT of the legs F-based method was not similar to that of the whole F-based method: the mean difference was 7.4 ms and the 95% limits of agreement was?45.1 to 59.8 ms, and it was the least valid method for the calculation among the four methods. In contrast, the normalised power was more valid in the legs F-based method, followed by whole and partial P-based methods. This information will help researchers and practitioners to decide upon their analysis methods when analysing block start performance. 相似文献