Memory for spatial and temporal order in deaf children     

J P Das 《American annals of the deaf》1983,128(7):894-899

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Autocatalysis — A misnomer?     

P. K. Das  E. Arunan 《Resonance》2002,7(7):76-79

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Cognitive performance of dysphasic students     

J. P. Das  Seija M. Äystö 《European Journal of Psychology of Education - EJPE》1994,9(1):27-39

The cognitive abilities of a group of dysphasic children in a special school in Finland were examined in this study to answer the following questions: Can we categorize their cognitive processing as planning, arousal-attention, simultaneous and successive processing (PASS)? The second question was concerned with detecting subgroups within the dysphasic sample in terms of PASS processes. The subjects were 60 dysphasic children in a special school. Their ages ranged from 7 to 19 years. All subjects were administered tests of planning, arousal-attention as well as simultaneous and successive processing. They were also administered the Wechsler test of intelligence for children and adults according to their ages, two sub-scales of Wechsler memory scale, as well as three ad hoc tests, cancellation task, KS persons and Rey Osterrieth copy task. The results of the factor analysis generally confirmed the emergence of the four PASS factors. As a results of cluster analysis, two subtypes of dysphasics emerged categorized as clearly high and low in the successive factor as well as relatively high and low on the simultaneous factor scores. The low-simultaneous/low-successive group was significantly lower in WISC verbal IQ the Wechsler memory scale for logical memory, and the ad hoc test of KS persons. The results were discussed, in terms of the importance of understanding the language problems typically associated with the two subtypes as well as the remedial program which will take into account their cognitive differences in spite of the fact that both groups had significant language impairment.  相似文献   

Young children's causal inferences   总被引：1，自引：0，他引：1  

P Das Gupta  P E Bryant 《Child development》1989,60(5):1138-1146

We report 2 experiments that show a striking development between the ages of 3 and 4 years in children's ability to make causal inferences about sequences of events. The task in the first experiment was to work out what had caused the change to an object that started out as odd (noncanonical) in 1 way and ended up as odd in 2 ways--starting, for example, as a broken cup and ending as a wet and broken cup. When asked to choose the instrument that had caused the change, 3-year-olds often selected the instrument that could have caused the initial state (a hammer, in our example) and not the instrument that would produce the change. 4-year-olds hardly ever made this mistake. In the second experiment, the 3-year-olds were able to make the correct choice when the change was from a canonical to a noncanonical state (cup-wet cup) but had much more difficulty when the change was from noncanonical to canonical (wet cup-dry cup). The difference was much smaller in the older group. The first of these tasks can be solved simply on the basis of knowledge that a particular instrument can cause a particular effect without reference to the initial state. The second task requires attention to the differences between initial and final state. We conclude that the ability to make genuine causal inferences develops between the ages of 3 and 4 years.  相似文献   

The madelung constant of the sodium chloride crystal lattice     

Sourav Das 《Resonance》2003,8(10):76-84

An analysis of the Madelung constant of the sodium chloride crystal lattice has been made, in an effort to supplement information available in undergraduate textbooks. A method of approximation of the constant using the personal computer is presented. An erratum to this article is available at .  相似文献   

What is a Species? An endless debate     

Uttam Saikia  Narayan Sharma  Abhijit Das 《Resonance》2008,13(11):1049-1064

Everybody is familiar with the ubiquitous term ‘species’. But what is a species? Undeniably, this is one of the most complex dilemmas in the history of biology. There is no other concept in biology as elementary yet controversial as the concept of species. In practice, a species is regarded as the fundamental unit of comparison in all biological disciplines like systematics, evolution, ecology, ethology, physiology, and genetics. However, little agreement exists in the scientific community regarding the nature of species, whether it is a real entity or a cultural artifact, its biological significance or how to delineate a species. This article is a review of the seemingly endless debate on the species concept and its implications.  相似文献   

基于ANP方法的逆向物流决策模型和算法   总被引：1，自引：0，他引：1  

王蓓  孙林岩 《软科学》2007,21(2):20-24

建立了具有内部关联的多指标逆向物流运作决策评价模型,并运用网络分析法(ANP)结合算例说明了该模型的合理性和实用性。  相似文献   

Polymorphonuclear leukocytic sialic acid and sialidase activity in obesity     

Raj K. Das  M. G. Muddeshwar 《Indian journal of clinical biochemistry : IJCB》1997,12(2):114-118

The level of sialic acid in the obese polymorphonuclear leukocytes (PMNL) was found to be significantly reduced as compared to normal. Activity of sialic acid degrading enzyme, sialidase, was found to be increased in the obese state. Restoration in both sialic acid content and sialidase activity was also evidenced in the PMNL of treated obese patients.  相似文献   

显示器电路故障分析与研究     

刘清波  孙业歧  蔡淑珍 《保定师专学报》2002,15(2):25-26,31

通过和彩色电视机电路的对比,主要分析、研究了计算机中显示器电路的特点以及常见故障的判断检修方法。提供部分实例,可供维修人员参考。  相似文献   

注意:概念、测验和教师等级评定     

J.P.Das 《华东师范大学学报(教育科学版)》2002,20(3):68-76,96

本文的理论部分探讨注意的性质、注意的测验和测量，以及注意缺陷的鉴定。注意具有选择性，它包含着对冲动反应的抑制和对分心的克服。第二部分讨论三项经验研究，这些研究探索了注意等级评定量表的使用，该量表由教师对儿童在课堂情境下的注意情况进行等级评定。研究发现，教师的等级评定可以预测课外情境中儿童在注意测验上的表现。这些等级评定具有显著的预测性，正如该测验的结果所表明的，教师一直关注着儿童注意的一个重要方面，即对分心的抵制。在结论性评述中，讨论了可能导向注意缺陷改善的动态测试。第三部分是附录部分，例举了若干注意力测验。  相似文献