动物医学专业形态学实验教学模式改革初探     

李培英  李福宝  祁克宗  方富贵  蒋书东  涂健  张丽霞  周杰  魏建忠  丁书荃 《安徽科技学院学报》2008,22(6)

动物医学专业形态学实验教学是动物医学本科教学体系的重要组成部分,为了提高实验教学效果,对形态学实验教学模式进行了改革:将动物解剖学、组织胚胎学和病理学的实验内容划分为基本实验项目模块和形态学综合实验模块,通过实验课程内容的整合,减少了实验内容的重复率,加大了学科内容知识点的联系,增加了综合性实验和研究性实验内容.问卷调查显示,本次所进行的动物形态学实验教学模式改革取得了较好的效果.  相似文献   

First record of <Emphasis Type="Italic">Bursaphelenchus rainulfi</Emphasis> on pine trees from eastern China and its phylogenetic relationship with intro-genus species   总被引：1，自引：0，他引：1  

Jiang LQ  Li XQ  Zheng JW 《Journal of Zhejiang University. Science. B》2007,8(5):345-351

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Searching strategies for the Bulgarian language     

Jacques Savoy 《Information Retrieval》2007,10(6):509-529

This paper reports on the underlying IR problems encountered when indexing and searching with the Bulgarian language. For this language we propose a general light stemmer and demonstrate that it can be quite effective, producing significantly better MAP (around + 34%) than an approach not applying stemming. We implement the GL2 model derived from the Divergence from Randomness paradigm and find its retrieval effectiveness better than other probabilistic, vector-space and language models. The resulting MAP is found to be about 50% better than the classical tf idf approach. Moreover, increasing the query size enhances the MAP by around 10% (from T to TD). In order to compare the retrieval effectiveness of our suggested stopword list and the light stemmer developed for the Bulgarian language, we conduct a set of experiments on another stopword list and also a more complex and aggressive stemmer. Results tend to indicate that there is no statistically significant difference between these variants and our suggested approach. This paper evaluates other indexing strategies such as 4-gram indexing and indexing based on the automatic decompounding of compound words. Finally, we analyze certain queries to discover why we obtained poor results, when indexing Bulgarian documents using the suggested word-based approach.  相似文献   

HPS: High precision stemmer     

Tomáš Brychcín  Miloslav Konopík 《Information processing & management》2015

Research into unsupervised ways of stemming has resulted, in the past few years, in the development of methods that are reliable and perform well. Our approach further shifts the boundaries of the state of the art by providing more accurate stemming results. The idea of the approach consists in building a stemmer in two stages. In the first stage, a stemming algorithm based upon clustering, which exploits the lexical and semantic information of words, is used to prepare large-scale training data for the second-stage algorithm. The second-stage algorithm uses a maximum entropy classifier. The stemming-specific features help the classifier decide when and how to stem a particular word.  相似文献   

Morphological priming effects on children’s spelling     

Joao Manuel Rosa  Terezinha Nunes 《Reading and writing》2008,21(8):763-781

Previous research has suggested that children in the early grades of primary school do not have much awareness of morphemes. In this study, a priming paradigm was used to try to detect early signs of morphological representation of stems through a spelling task presented to Portuguese children (N = 805; age range 6–9 years). Primes shared the stem with the targets and contained well-articulated, stressed vowels; the stems of the target words and pseudo-words contained non-stressed schwa vowels, which typically result in spelling difficulties. If priming proved effective, the well-articulated vowels in the prime should result in an improvement in the spelling of the schwa vowels. Primes were presented in two conditions: in only-oral or in oral-plus-written form. Effectiveness of priming was assessed by comparison with a no-priming condition. For both words and pseudowords, there was a significant interaction between priming effects and grade. No priming effects were detected in 6- and 7-year-old children; oral-plus-written priming produced higher rates of correct vowel spelling for 8- and 9-year-olds; only-oral priming was effective in improving the vowel spelling of 9-year-olds. Thus older children can use morphological information under priming conditions when the prime and the target are not phonologically transparent but there is no evidence to suggest that younger children do so.  相似文献   

超临界CO2做发泡剂制备多孔尼龙66膜的研究   总被引：1，自引：0，他引：1  

彭琦  李莹莹  许群 《洛阳工业高等专科学校学报》2007,17(4):4-6,30

超临界CO2做发泡剂制备多孔膜尼龙66,通过X射线衍射、扫描电镜和水通量的方法对膜结晶度、孔形态和水通量进行了表征.超临界CO2的作用促使膜结晶度提高,得到胞腔状开孔结构膜.  相似文献   

Morphological,phonological, and orthographic differences between the spelling of normally achieving children and basic literacy adults     

Jo Worthy  Neva M. Viise 《Reading and writing》1996,8(2):139-159

In this study, we compared 41 adults in a basic literacy class with 92 achievement-level-matched children on their use of English print conventions, as inferred by a qualitative analysis of spelling errors. The two groups followed similar patterns in their mastery of basic spelling features, including letter reversals, consonant blends, and short vowels, with the adults showing relatively more advanced skill in using orthographic patterns. However, the adults made a preponderance of misspellings that were rarely made by the children, including omissions, substitutions, and additions of derivational and inflectional morphemes, and neglect of word endings in general. The findings indicate clear morphological difficulties along with more subtle phonological coding deficits. We suggest that low literacy adults would benefit from specific direct instruction in linguistic analysis, with particular attention to the morphological principles underlying inflections and derivations. Such instruction should be based on a careful assessment of reading and spelling knowledge.  相似文献   

星叶草叶脉序的形态学及其系统学意义   总被引：1，自引：0，他引：1  

任毅  胡正海  李智军 《中国科学院研究生院学报》1997,35(3):219-224

在星叶草叶二叉分枝脉序中，网结脉中2条完全汇合叶脉与靠近脉中完全分离叶脉间未发现任 何形式的维管束汇合的中间类型，相反观察到了网结脉中不同程度的连接脉退化的痕迹，因此网结脉不可能由靠近脉形成；盲脉的出现与齿的退化、网结脉中连接脉的间断及非网结脉由分枝处间断等相关；上述事实表明星叶草叶的二叉分枝脉序应为一减化性状。  相似文献   

克氏原螯虾替代对虾进行甲壳动物学实验的形态解剖     

薛俊增  吴惠仙  张丽萍 《涪陵师范学院学报》1998,(4)

本文研究了克氏原螯虾外部形态和内部解剖结构,为甲壳动物学实验提供指导。  相似文献   

中日同形词的比较研究     

吴春燕 《安阳师范学院学报》2009,(3):112-115

同形词的学习在日语的词汇学习中占有重要的地位,其既同又异的特性往往使学习者出现误用。本文试图从同形词常见的误用类型出发,对同形词差异产生的原因及在学习中如何对待同形词进行探讨。  相似文献