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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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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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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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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
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比较教育方法论以因素分析、历史研究等方法构建了独特的研究模式,进入21世纪以来,多元化的研究方法日渐凸显。实地调查的研究方法作为比较教育的研究方法之一在20世纪90年代以后开始走向规范化。本文着重分析日本比较教育学者历年来面向方法论的改革与挑战所发表的学术论文,充分肯定了"实地调查"这一研究方法在比较教育学科发展中的地位和作用。 相似文献
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