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通过对336名杭州市区青春期男、女少年足长与身高的相关研究,初步了解本地区青春期男、女少年足长、身高发育的某些特点与规律。与1979年全国同龄男、女少年足长、身高发育相比较,杭州市区男、女少年足长与身高的发育水平高于全国同龄男、女少年;而足长/身高指数小于全国水平。因此,运用1979年的“足长预测身高表”预测当前杭州市区的男、女少年的身高,将会出现较大的误差。因而,有必要建立适合本地区男、女少年的“足长预测身高表”。 相似文献
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文本长度、T单位长度是影响二语写作质量的两个重要因素.通过对49名非英语专业学生英语写作进行实验研究,得出写作的文本长度、T单位长度与写作成绩呈显著相关,并且高分组和低分组在写作的文本长度、T单位长度两个变量上都存在显著差异.实验结果进一步验证了目前国内盛行的"写长法"教学,为外语写作教学提供了一些启示. 相似文献
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从数字的结构形状着手,通过分析印刷体数字的形状,提出了一种基于结构形状的印刷体数字识别方法。该方法不用对字符图像进行复杂的细化处理,减少了因细化带来的误差问题,因而识别速度非常快,实验证明了该方法的有效性。 相似文献
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Feng Chen Yong-hui Dang Chun-xia Yan Yan-ling Liu Ya-jun Deng David J. R. Fulton Teng Chen 《Journal of Zhejiang University. Science. B》2009,10(10):711-720
The purpose of this study was to investigate mitochondrial DNA (mtDNA) hypervariable segment-I (HVS-I) C-stretch variations and explore the significance of these variations in forensic and population genetics studies. The C-stretch sequence variation was studied in 919 unrelated individuals from 8 Chinese ethnic groups using both direct and clone sequencing ap-proaches. Thirty eight C-stretch haplotypes were identified, and some novel and population specific haplotypes were also detected. The C-stretch genetic diversity (GD) values were relatively high, and probability (P) values were low. Additionally, C-stretch length heteroplasmy was observed in approximately 9% of individuals studied. There was a significant correlation (r=-0.961, P<0.01) between the expansion of the cytosine sequence length in the C-stretch of HVS-I and a reduction in the number of up-stream adenines. These results indicate that the C-stretch could be a useful genetic maker in forensic identification of Chinese populations. The results from the Fst and dA genetic distance matrix, neighbor-joining tree, and principal component map also suggest that C-stretch could be used as a reliable genetic marker in population genetics. 相似文献
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Peng-min Pan Jian-ping Li Gu-lai Lv Hui Yang Song-ming Zhu Jian-zhong Lou 《Journal of Zhejiang University. Science. B》2009,10(8):589-594
The weight of shelled shrimp is an important parameter for grading process. The weight prediction of shelled shrimp by contour
area is not accurate enough because of the ignorance of the shrimp thickness. In this paper, a multivariate prediction model
containing area, perimeter, length, and width was established. A new calibration algorithm for extracting length of shelled
shrimp was proposed, which contains binary image thinning, branch recognition and elimination, and length reconstruction,
while its width was calculated during the process of length extracting. The model was further validated with another set of
images from 30 shelled shrimps. For a comparison purpose, artificial neural network (ANN) was used for the shrimp weight predication.
The ANN model resulted in a better prediction accuracy (with the average relative error at 2.67%), but took a tenfold increase
in calculation time compared with the weight-area-perimeter (WAP) model (with the average relative error at 3.02%). We thus
conclude that the WAP model is a better method for the prediction of the weight of shelled red shrimp.
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Anuradha Bharosay Vivek Vikram Bharosay Meena Varma Kiran Saxena Ajoy Sodani Ravi Saxena 《Indian journal of clinical biochemistry : IJCB》2012,27(2):186-190
Stroke is the third major cause of death and foremost cause of disability worldwide. Cerebrovascular stroke remains largely a clinical diagnosis. The use of biomarkers in diagnosing stroke and assessing prognosis is an emerging and rapidly evolving field. The study aimed to investigate the predictive value of neurobiochemical marker of brain damage (neuron-specific enolase [NSE]) with respect to degree of disability at the time of admission and neurological worsening in acute ischemic stroke patients. We investigated 150 patients with cerebrovascular stroke who were admitted within 72 h of onset of stroke in the Department of Neurology at SAIMS. Venous blood samples were taken after admission and NSE was analyzed by solid enzyme linked immunosorbent assay using Analyzer and microplate reader from Biored: Code 680. In all patients, the neurological status was evaluated by a standardized neurological examination and the National Institutes of Health Stroke Scale on admission and on day 7. Serum NSE concentration was found to significantly correlate with both degree of disability and neurological worsening in acute ischemic stroke cases in the present study. The maximum serum NSE level within 72 h of admission was significantly higher in patients with greater degree of disability at the time of admission. Serum NSE levels were also found to be significantly elevated in patients with bad neurological outcome. Our study showed that serum NSE has high predictive value for determining severity and early neurobehavioral outcome after acute stroke. 相似文献
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Abstract. The main type of phonemic analysis skill considered to affect spelling acquisition has been awareness of phoneme quality. However, it is also important to find out whether other measures of phoneme awareness might contribute to literacy acquisition. Thus, the influence of phoneme length and phoneme quality awareness on spelling in Finnish was compared. The Oddity task was used to assess phonemic awareness and spelling skills were investigated by a spelling-to-dictation task. The results showed that length awareness predicted spelling better than quality awareness did. Moreover, length awareness was more strongly related to spelling of long phonemes, which specifically require analysis of phoneme length, than to spelling of phoneme clusters not involving length analysis. Additionally, only length awareness predicted children's general spelling skills. These findings suggest that awareness of length, which is a phonemic attribute of the Finnish language, is connected to children's spelling skills more strongly than awareness of phoneme quality is. 相似文献