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In this article we derive the distribution, mean and variance of the number of cycles in a randomly selected permutation of the first n integers. 相似文献
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Kadam DP Suryakar AN Ankush RD Kadam CY Deshpande KH 《Indian journal of clinical biochemistry : IJCB》2010,25(4):388-392
Psoriasis is a chronic inflammatory, proliferative skin disease characterized by pathological skin lesions due to various
exogenous and endogenous factors. It is associated with a number of biochemical and immunological disturbances. Recently,
it has been suggested that increased reactive oxygen species (ROS) production and compromised function of antioxidant system
may be involved in the pathogenesis of this disease. In the present study, 90 psoriasis patients were selected. Disease severity
was assessed by psoriasis area severity index score and grouped as mild, moderate and severe (each group consists of 30 subjects)
and compared with 30 healthy controls. Serum levels of malondialdehyde, nitric oxide end products and the activities of antioxidant
enzymes such as erythrocyte-superoxide dismutase, catalase and total antioxidant status were investigated in these groups/subjects.
As compared to controls, we found severitywise significantly increased serum malondialdehyde, nitric oxide end products with
decrease in erythrocyte-superoxide dismutase activity, catalase activity and total antioxidant status in patients with psoriasis
suggesting worsening of the disease. It seems to be linked with the enhancement of Reactive Oxygen Species production and
decreased antioxidant potential in psoriasis. 相似文献
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Massive Online Open Course (MOOC) research indicates that lack of student motivation to learn generally plays a significant role in student attrition and dropouts. Aside from this, very little is known specifically about student motivation to learn in MOOCs. The purpose of this study is to empirically investigate the ways in which content, navigation, learning and support, accessibility, interactivity, visual design, and self-assessment and learnability impact the student motivation to learn in a MOOC. Understanding these relationships will provide MOOC educators and administrators with valuable understanding of the factors impacting student motivation to learn. Furthermore, the study analyzes the motivational factors of learners and identifies learners into different categories. The data for the study were collected from the Coursera course “iMOOC101: Mastering American e-Learning.” The study findings indicate that content, accessibility, and interactivity significantly impact student motivation to learn, whereas navigation and learning and support marginally impact student motivation to learn. However, visual design and self-assessment and learnability were not found to be significant in student motivation to learn. 相似文献
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We establish an interesting connection between the number of runs and the length of the first run when tossing a fair coin. 相似文献
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The purpose of this study was to create a substantial body of knowledge about the factors that influence the success of electronic journals, and to share this knowledge with that in the fields of astronomy and astrophysics in order to help facilitate change.Structured questionnaires for users (Academic Members, Post-Doctoral Fellows and Research Scholars) containing 40 different questions, many of which were further subdivided and framed in order to get information on various aspects of the usage of electronic journals. The purpose was to identify the basic minimum infrastructure necessary to provide users access to electronic journals and to facilitate easy response in all major A&A organizations in India.The increasing use of the electronic information-seeking environment has produced changes in the practice of science. Significant research has been conducted already on the impact of new information and communication technologies on scholarly work.This study was limited to astronomy and astrophysics libraries and information centres in India.This paper identifies the information needs of the users. Each community and discipline has its own specific legacy of journal structure, reading, publishing, and researching practices, and it will take trial and error to establish which kinds of e-journals are the most effective and useful.Case study. 相似文献
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