排序方式： 共有27条查询结果，搜索用时 31 毫秒
1.
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
2.
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
3.
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
4.
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
5.
6.
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
7.
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
8.
Structural equation modeling with survey data from 313 college counselors revealed that multicultural training significantly mediated the impact of both ethnic identity and gender roles on multicultural counseling competence (MCC), explaining 24% of MCC variance. Results indicated that college counselors need to be aware of their own gender roles and ethnic identity to be culturally competent and highlighted the mediational role that training plays in achieving MCC. 相似文献
9.
Effects of tactile contact with an imprinting stimulus object on the initiation and maintenance of the following response in neonatal Japanese quail,Coturnix coturnix japonica, were examined. Tactile contact with an imprinting stimulus object was permitted during a preexposure period and/or during a following test. Results indicated that following was stronger when tactile contact was permitted during either the preexposure or test periods than when such contact was not given. Following occurred sooner when contact was permitted during the preexposure period than during following only, or when no contact was permitted. The greatest strength of following occurred when tactile stimulation was permitted during both preexposure and testing periods. It was concluded that the results support the hypothesis that tactile stimulation can facilitate both the initiation and maintenance of following behavior, and this is interpreted as being consistent with Schneirla’s (1965) theory. 相似文献
10.