排序方式： 共有57条查询结果，搜索用时 15 毫秒
31.
Samir N. Hamade 《International Information and Library Review》2013,45(3):139-150
AbstractThis paper attempts to shed some light on the scientific communication behavior of Arab authors in library and information science by studying the characteristics of the literature used by these authors. A bibliometric study by way of citation analysis was conducted on the articles published from 1978 to 1988 in Maktabat Al-Idarah, an elite Arab scholarly journal in the field. It was concluded from this study that English literature is the main source of information for Arab authors in library and information science. They rely on English literature that is between 5 and 15 years of age more than on their own literature and use books more than any other form of publication. They cover almost all areas of the field with special emphasis on technical services as represented by cataloging, classification and aquisition, library administration and library education. Local materials published in their own country were also important. 相似文献
32.
Reactive oxygen species (ROS) are believed to be responsible for pathogenesis of various diseases affecting tissues and systems.
ROS generated by mitochondrial electron transport chain as well as extra-mitochondrially are eliminated by the respective
defense mechanisms. We checked the activity of ROS generating system such as xanthine oxidase and also the parameter of ROS
defense mechanism e.g. superoxide dismutase (SOD), catalase, glutathione peroxidase (GPox), reduced glutathione content (GSH)
and glucose-6-phosphate dehydrogenase (G6PDH) in mitochondrial and post-mitochondrial fractions from various tissues (liver,
kidney, brain and heart) of normal rats. Extent of lipid peroxidation (LPO) which is immediate consequence of ROS generation
was also examined. Our results shows that significant tissue-specific differences exist in mitochondrial and cytosolic ROS
generating systems and ROS defense mechanisms. 相似文献
33.
Samir Bhattacharya 《Resonance》1998,3(10):59-69
Salinity of water is a stumbling block for the movement of aquatic animals. There are thousands of fish species whose localization in water bodies is strictly restricted to either the sea or freshwater (rivers, lakes, ponds, etc.), or brackish water (where river or lake water mixes with sea water). Only three species known so far have conquered this deadly salt barrier and made crossing it a regular life process. This article gives an indepth account of the processes and strategies that enable them to do so. 相似文献
34.
35.
Samir Abd Elghafar Salaheldin M. Diab Bassiouny M. Sallam Emad S. Hassan Mona Shokair Waleed Al-Nauimy Moawad I. Dessouky El-Sayed M. El-Rabaie Saleh Alshebeili Fathi E. Abd El-Samie 《Journal of The Franklin Institute》2014
This paper presents a new implementation of discrete multi-tone (DMT) systems based on different discrete transforms that include the discrete sine transform (DST), discrete cosine transform (DCT), and discrete wavelet transform (DWT). The implementation also considers time-domain equalization to mitigate channel distortion. Compared to the fast Fourier transform discrete multi-tone (FFT-DMT) system, the proposed implementations have an advantage in that their energy-compaction property helps in reducing the channel effects. The performance of the DST-DMT, DCT-DMT, DWT-DMT, and FFT-DMT systems, employing a time-domain equalizer (TEQ), is investigated in the paper. It has been demonstrated by computer simulations that the proposed implementations outperform the FFT-DMT system and that the utilization of the TEQ can lead to higher bit rates 相似文献
36.
Samir A. Husni 《Journal of Media Economics》2013,26(1):39-49
This study tracks magazines started from 1981 to 1983 that have survived to the present. It finds that magazines started by entrepreneurs, rather than media firms, and magazines that were consumer driven, rather than advertising driven, were more likely to survive. 相似文献
37.
We tested the hypothesis that intergenerational effects of parents’ war trauma on offspring's attachment and mental health are mediated by psychological maltreatment. Two hundred and forty children and their parents were sampled from a war-prone area, Gaza, Palestine. The parents reported the number and type of traumatic experiences of war they had had during their lifetime before the child's birth and during a current war when the child was 10–12 years old. The children reported their war traumas, experiences of psychological maltreatment, attachment security, and symptoms of posttraumatic stress (PTSS), depression, and aggression. The direct and indirect intergenerational effects of war trauma were tested in structural equation models. The hypotheses were confirmed for father's past war exposure, and disconfirmed for mother's war exposure. The father's past war trauma had a negative association with attachment security and positive association with the child's mental health problems mediated by increased psychological maltreatment. In contrast, the mother's past war trauma had a negative association with the child's depression via decreased psychological maltreatment. The mother's current war trauma had a negative association with the child's depression and aggression via decreased psychological maltreatment. Among fathers, past war exposure should be considered as a risk factor for psychological maltreatment of children and the associated attachment insecurity and mental health problems. Among mothers, war exposure as such could be given less clinical attention than PTSS in the prevention of psychological maltreatment of children. 相似文献
38.
39.
40.
Udit Kr. Chakraborty Debanjan Konar Samir Roy Sankhayan Choudhury 《Education and Information Technologies》2016,21(1):171-184
Evaluating Learners’ Response in an e-Learning environment has been the topic of current research in areas of Human Computer Interaction, e-Learning, Education Technology and even Natural Language Processing. The current paper presents a twofold strategy to evaluate single word response of a learner in an e-Learning environment. The response of the learner to be evaluated would consist of errors committed due to lack of knowledge and also out of inadvertent mistakes committed while typing the answers. The proposed system benevolently considers such errors and still marks the learner partially. The feature incorporated in this work adds the human element to the mechanised system of evaluation and assessment in an e-Learning environment. 相似文献