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用超粒子模拟方法（Particle in Cell Method）数值研究了超强激光（10^20W/cm^2）与等离子体相互作用后产生的粒子束收缩问题.结果表明,由于超强激光照射的等离子体靶形的改变,直接影响被加速的粒子束收缩.阐述了激光辐照三角形壳靶时,等离子体向心会聚过程的数值模拟实验结果. 相似文献
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Mapping novel nouns and verbs onto dynamic action events: are verb meanings easier to learn than noun meanings for Japanese children? 总被引：1，自引：0，他引：1
The present research examined how 3- and 5-year-old Japanese children map novel nouns and verbs onto dynamic action events and generalize them to new instances. Studies 1 to 3 demonstrated that although both 3- and 5-year-olds were able to map novel nouns onto novel objects, only 5-year-olds could generalize verbs solely on the basis of the sameness of the action. Study 4 showed that the difficulty young children experience in learning verbs lies mainly in mapping the appropriate element to a verb rather than in encoding and remembering an action itself. The results of this research are related to a long-debated issue of whether noun learning is privileged over verb learning. 相似文献
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"倡导真确的健康饮食生活"即"正食生活"在生活中十分重要。充分理解,遵循"正食生活"探索和挖掘自然与生命的根本,选择正确的食物,在最基本的前提之下发掘生命的自然。 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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We examine how R&D portfolios of drug pipelines affect pharmaceutical licensing, controlling firm size, diversity, and competition. The data collected comprises 434 license-ins and 329 license-outs closed by 54 Japanese pharmaceutical companies between 1997 and 2007. We pay special attention to stage-specific licensing by dividing the innovation process into early and late stages. Joint estimates of license-in and license-out using seemingly unrelated regressions (SUR) reveal that drug pipelines significantly affect stage-specific licensing, inducing portfolio effect that lead to smoothing drug pipelines across early and late stages. 相似文献
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Alexandra Okada Denise Whitelock Wayne Holmes Chris Edwards 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(2):861-875
Authenticating the students’ identity and authenticity of their work is increasingly important to reduce academic malpractices and for quality assurance purposes in Education. There is a growing body of research about technological innovations to combat cheating and plagiarism. However, the literature is very limited on the impact of e-authentication systems across distinctive end-users because it is not a widespread practice at the moment. A considerable gap is to understand whether the use of e-authentication systems would increase trust on e-assessment, and to extend, whether students’ acceptance would vary across gender, age and previous experiences. This study aims to shed light on this area by examining the attitudes and experiences of 328 students who used an authentication system known as adaptive trust-based e-assessment system for learning (TeSLA). Evidence from mixed-method analysis suggests a broadly positive acceptance of these e-authentication technologies by distance education students. However, significant differences in the students’ responses indicated, for instance, that men were less concerned about providing personal data than women; middle-aged participants were more aware of the nuances of cheating and plagiarism; while younger students were more likely to reject e-authentication, considerably due to data privacy and security and students with disabilities due to concerns about their special needs. 相似文献
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Imai M Li L Haryu E Okada H Hirsh-Pasek K Golinkoff RM Shigematsu J 《Child development》2008,79(4):979-1000
When can children speaking Japanese, English, or Chinese map and extend novel nouns and verbs? Across 6 studies, 3‐ and 5‐year‐old children in all 3 languages map and extend novel nouns more readily than novel verbs. This finding prevails even in languages like Chinese and Japanese that are assumed to be verb‐friendly languages (e.g., T. Tardif, 1996 ). The results also suggest that the input language uniquely shapes verb learning such that English‐speaking children require grammatical support to learn verbs, whereas Chinese children require pragmatic as well as grammatical support. This research bears on how universally shared cognitive factors and language‐specific linguistic factors interact in lexical development. 相似文献
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Akito Okada 《Compare》1999,29(2):171-189
This paper aims to throw light on the evolution and historical transformation of the concept of equality of opportunity as applied to educational policies in Japan from the end of World War II to the present day. It analyses the Central Council for Education's (CCE) reform proposals in the 1990s, and places them in the context of developing the concept of equality of educational opportunity in the years since 1945, when the post‐war education system was established in Japan. More specifically it addresses the following questions: What kinds of equality of educational opportunity have the central administrative bodies (Monbusho or the CCE), the political parties and teachers aimed to achieve since the war? How have they applied equality of opportunity to educational policies? What kinds of criteria are used by them to measure equality of educational opportunity? To do so, it looks in detail at the main agenda in relation to the issue of equal opportunity in the reports by the CCE on both the state of education in the 1990s, and its transformation during the five decades since the war. To trace the historical transformation of the concept of equality of educational opportunity, this article selects two major explanatory models—egalitarianism and meritocracy. Although there is widespread agreement that equality of opportunity is a requirement of a just society in Japan, there is also widespread disagreement about just what this requirement amounts to and how it is to be balanced against other requirements such as ‘meritocracy’. 相似文献
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Toshihiko Hashimoto Takanori Ishii Naoyuki Okada Masahiro Itoh 《Journal of sports sciences》2015,33(13):1356-1365
In this study, eight judo athletes who are major candidates for the Japan national team were recruited as participants. Kinematic analysis of exemplary ukemi techniques was carried out using two throws, o-soto-gari, a throw linked to frequent injury, and o-uchi-gari. The aim of this study was to kinematically quantify the timing patterns of exemplary ukemi techniques and to obtain kinematic information of the head, in a sequence of ukemi from the onset of the throw to the completion of ukemi. The results indicated that the vertical velocity with which the uke’s head decelerated was reduced by increasing the body surface exposed to the collision with the tatami and by increasing the elapsed time. In particular, overall upper limb contact with the tatami is greatly associated with deceleration. In o-soto-gari, the impulsive force on the faller’s head as the head reached the lowest point was 204.82 ± 19.95 kg m · s–2 while in o-uchi-gari it was 118.46 ± 63.62 kg m · s–2, z = ?1.75, P = 0.08, and it did present a large-sized effect with r = 0.78. These findings indicate that the exemplary o-soto-gari as compared to o-uchi-gari is the technique that causes more significant damage to the uke’s head. 相似文献