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1.
Nikki Rommers Mireille Mostaert Lennert Goossens Roel Vaeyens Erik Witvrouw Matthieu Lenoir 《Journal of sports sciences》2019,37(2):196-203
This study investigated differences in generic and soccer specific motor coordination, as well as speed and agility depending on age and maturity in elite youth soccer players (U10-U15, N = 619). Measurements included body height, body weight and sitting height to estimate age at peak height velocity (APHV); three Körperkoordinationstest für Kinder subtests (i.e. jumping sideways (JS), moving sideways (MS), balancing backwards (BB)) to assess generic motor coordination; the UGent dribbling test for soccer specific motor coordination; a 5m/30m sprint and T-test for speed and agility, respectively. Age specific z-scores of the predicted APHV identified players as earlier, on time or later maturing. (M)ANOVA analyses showed significant age by maturity interaction effects for the speed and agility test cluster, revealing maturity related differences in U14 and U15 players. Next to an overall higher performance with age for all test clusters (η2 0.080–0.468), earlier maturing players outperformed their later maturing peers in 5m/30m sprinting. The opposite was seen for JS and BB. So, players’ maturity status should be taken into account to adequately value performance in talent identification. Also, the focus on characteristics that appear to be minimally biased by an earlier maturational timing (i.e. motor coordination) should be increased. 相似文献
2.
The paper describes the edition, on computer output microfiche, of the supplement to the 1965 Union catalogue of foreign periodicals in Belgian and Luxemburgian libraries and documentation centers. The microfiches contain location information of 28,000 periodicals in 300 libraries and are edited in a rich typography. The paper discusses the coding of the bibliographic fields, the computer processing and formulates some forecasts for the near and further future. 相似文献
3.
Web-spinning activity ofAchaearanea tepidarortum (Koch) was observed in relation to amount of prior feeding, hours of food deprivation, and the number of flies (Drosophila melanogaster) available in the animal’s environment. Web spinning was positively related to the number of flies consumed in a 24-h period prior to testing, but did not vary significantly between 24 and 72 h of food deprivation. The amount of available food in the environment was positively related to web-spinning activity during a 48-h test period. 相似文献
4.
连文琰 《中国科学院研究生院学报》1975,13(1):32-55
The Menispermaceae is a well-known alkaloid-rich family within the flowering
plants. Because of the therapeutic value and pharmacological actions of the alkaloids,
contents of its members it has, besides taxonomists also attracted the attention of
chemists, pharmacists and other research workers. In the present work, the menisper-
maceous medicinal plants of this country are dealt with from their taxonomical, phy-
tochemical and therapeutic aspects.
As a result of our preliminary study, out of 18 genera with some 70 species so
far found in China, 15 genera with 51 species and 2 varieties are known to possess
medicinal value, of which some are famous Chinese drugs, viz. Stephania tetrandra S.
Moore (粉防己), Tinospora callipes Gagnep. (金果榄), Sinomenium acutum (Thunb.)
Rehd. et Wils. (青藤); some are important folk remedies, e.g. Archangelisia loureirii
(Pierre) Diels (古山龙), Stephania cepharantha Hayata (金线吊乌龟); and some are
raw materials for the preparation of medicines, e.g. Fibraurea tinctoria Lour. for
tetrahydropalmatine, Stephania sinica Diels for rotundine, etc.
After a careful taxonomic examination, two new species, Cocculus mokaingensis
Lien, Pericampelos omeiensis Lien, are found and herewith discribed.
Isoquinoline alkaloids are widely distributed in the whole family. The Trib.
Aniamirteae consisting of genus Arcangelisia, the Trib. Fibraureae consisting of
genera Tinomiscium and Fibraurea, as well as the Trib. Tinosporeae consisting of
genera Tinospora and Parabaena are charaterized by the presence of proberberine
alkaloids, e.g. berberine, palmatine, jatrorrhizine, columbamine, etc. and such
alkaloid-bearing plants are commonly used as antiperiodic, antidote, antibiotic, anti-
malarial, etc. On the other hand, the Trib. Menispermeae elaborates mainly
bisbenzylisoquinoline-type alkaloids, and these plants are usually used in the treatment
of rheumatism, and often as an anodyne, diuretic etc. To facilitate identification, 10 plates are here provided. 相似文献
5.
基于建筑信息模型（Building Information Modeling, BIM)）概念,以福州市规划设计研究院新建大楼为实际案例,应用Autodesk Revit软件将原有CAD图纸进行BIM结构钢筋和机电模型建置,并提出BIM技术虚拟仿真过程中发现的问题。研究结果表明:（１）BIM技术可实际解决工程常常出现钢筋复杂节点、机电管道碰撞的问题;（２）机电系统进行Revit翻模时,不能按原CAD路径绘制,族库不全需建族完善。该研究成果可为后期施工决策提供技术支持,并有助于相关行业人士学习与借鉴。 相似文献
6.
以粒子蜂群网络建立高性能混凝土坍落度模型 总被引：1，自引：0，他引：1
以粒子蜂群算法(particle bee algorithm, PBA)结合神经网络(artificial neural network, NN),发展出一套能预测高性能混凝土(high performance concrete, HPC)坍落度模型的方法。以演化运算树(genetic operation tree, GOT)及倒传递网络(back propagation network, BPN)2种已发表的方法来比较其准确度。从模型的准确度可知,粒子蜂群网络(particle bee neural network, PBNN)模型预测的准确度高于GOT,但接近BPN的准确度;从参数的影响性可知,PBNN显示水、强塑剂、粗骨材、细骨材、粉煤灰及水泥添加量对于HPC坍落度的影响性大,而高炉矿渣粉用量对HPC坍落度并不敏感,显示各项材料对于坍落度的影响仍具备高度复杂性。 相似文献
7.
Veerle Germeijs Koen Luyckx Guy Notelaers Luc Goossens Karine Verschueren 《Contemporary educational psychology》2012
This study identified decision-making profiles of students who make a choice of a major in higher education. These profiles were examined in a sample of Belgian students at the end of Grade 12, when the educational system expects that these adolescents choose a specific major. Using latent class cluster analysis on adolescents’ scores for coping with career decisional tasks (i.e., orientation, exploration, decisional status, and commitment), four clusters were identified. As expected, these profiles paralleled Marcia’s (1966) identity statuses (i.e., the achievement, moratorium, foreclosure, and diffusion status). Results provided support for the external validity of the identified clusters through differential associations with several person variables (i.e., career decision-making self-efficacy, career choice anxiety, and decision-making style) and with academic functioning in higher education (i.e., commitment, academic and social adjustment). Implications for current educational research and research on career decision-making are discussed. 相似文献
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9.
Rating scale items have been widely used in educational and psychological tests. These items require people to make subjective judgments, and these subjective judgments usually involve randomness. To account for this randomness, Wang, Wilson, and Shih proposed the random‐effect rating scale model in which the threshold parameters are treated as random effects rather than fixed effects. In the present study, the Wang et al. model was further extended to incorporate slope parameters and embed the new model within the framework of multilevel nonlinear mixed‐effect models. This was done so that (1) no efforts are needed to derive parameter estimation procedures, and (2) existing computer programs can be applied directly. A brief simulation study was conducted to ascertain parameter recovery using the SAS NLMIXED procedure. An empirical example regarding students’ interest in learning science is presented to demonstrate the implications and applications of the new model. 相似文献
10.
Intercultural interaction plays an important role in contributing to international students’ learning and wellbeing in the host country. While research on international students’ intercultural interactions reveals multifaceted aspects of personal and social factors, there is a tendency to consider language barrier and cultural differences as individual factors that constrain their interactions with the institutional community. Drawing on 105 interviews with international students in Australian vocational education and training and dual sector institutions, this paper examines international students’ intercultural interactions in host institutions and the factors that act as enablers or inhibitors for intercultural interactions. It highlights the social and structural conditions in creating symbolic capital of elitist Anglo-Australian culture and English language, and social differentiation. This paper offers insights into understanding the legitimacy of such elitism, in hope that future conceptualisation, research and practices of intercultural interactions may locate international students within their cultural diversity. 相似文献