Exact solutions for the generalized KdV equation by using Backlund transformations     

Hassan A. Zedan 《Journal of The Franklin Institute》2011,348(8):1751-1768

In this paper, the Backlund transformations for the generalized KdV equation are constructed through Ablowitz–Kaup–Newell–Segur (AKNS) system in using Ricatti's form of the inverse method. The derived Backlund transformations are used to generate new classes of exact solutions. The technique developed here is based on the construction of wave functions which are the solutions of the associated AKNS. From known simple solutions we shall construct other solitons and wave solutions as well.  相似文献   

Antibacterial and antifungal activities of different parts of Tribulus terrestris L. growing in Iraq     

Al-Bayati FA  Al-Mola HF 《Journal of Zhejiang University. Science. B》2008,9(2):154-159

Antimicrobial activity of organic and aqueous extracts from fruits, leaves and roots of Tribulus terrestris L., an Iraqi medicinal plant used as urinary anti-infective in folk medicine, was examined against 11 species of pathogenic and non-pathogenic microorganisms: Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, Corynebacterium diphtheriae, Escherichia coli,Proteus vulgaris, Serratia marcescens, Salmonella typhimurium, Klebsiella pneumoniae, Pseudomonas aeruginosa and Candida albicans using microdilution method in 96 multiwell microtiter plates. All the extracts from the different parts of the plant showed antimicrobial activity against most tested microorganisms. The most active extract against both Gram-negative and Gram-positive bacteria was ethanol extract from the fruits with a minimal inhibitory concentration (MIC) value of 0.15 mg/ml against B. subtilis,B. cereus, P. vulgaris and C. diphtheriae. In addition, the same extract from the same plant part demonstrated the strongest antifungal activity against C. albicans with an MIC value of 0.15 mg/ml.  相似文献   

Validity of acute phase proteins and trace metals as adjuncts in viral hepatitis A and B     

Saad A. Noeman  Kommajosyula Sharada  Hassan El-Bena  Samia EL Dardery  Khalid AL Sawaf 《Indian journal of clinical biochemistry : IJCB》1994,9(1):40-42

The level of seven acute phase proteins was estimated together with copper and zinc in two groups of 15 children each suffering from hepatitis A (HAV) or Hepatitis B (HBV). The mean concentration of α-1 antitrypsin, α-2 macroglobulin, ceruloplasmin, C3 and copper was increased uniformly in both the types of viral hepatitis. α-1 acid glycoprotein, haptoglobin and zinc levels were decreased in both the infections. A significant decrease in albumin level was observed in HAV while the decrease was not significant in HBV. All the paramenters were repeated after one month on the day of discharge following the disappearance of clinical signs and symptoms wherein the haptoglobin level returned to normal in HAV. No change was observed in the level of other acute phase proteins. The level of the trace elements returned to normal. The observed increase in the levels of acute phase proteins at the onset does not seem to have any significant relation to the subsequent course of the disease. However, the level of acute phase proteins and other biochemical parameters may indicate a delayed biochemical recovery phase in conjunction with the underlying hepatic pathological changes in the course of viral hepatitis in spite of clinical recovery.  相似文献   

Validating the Watson Glaser Critical Thinking Appraisal     

Karma El Hassan  Ghida Madhum 《Higher Education》2007,54(3):361-383

This study validated the Watson Glaser Critical Thinking Appraisal (WGCTA) on a sample of 273 private university students in Lebanon. For that purpose, evidence for construct validation was investigated through identifying the test’s factor structure and subscale total correlations, in addition to differences in scores by gender, different levels, and streams using a series of ANOVA tests. Evidence for the test’s reliability and concurrent validity was also collected. Moreover, students in five courses that emphasize critical thinking were pre–post tested using the WGCTA. Exploratory factor analysis revealed a unidimensional factor while results showed no significant differences in scores on the WGCTA between males and females or between students at different levels except for graduate students in the Business stream. Furthermore, results revealed significant differences for the senior students between different streams. Finally, results showed no statistically significant changes in the mean scores of students who were pre- and post-tested except for nursing students. The test’s significant correlations with various criterion measures provided evidence of its convergent and divergent validities. The results were discussed in terms of the nature of the construct itself, and the effects of training and effective instructional strategies on growth of critical thinking. Recommendations for future research were proposed.  相似文献   

Student control ideology and the science classroom environment in urban secondary schools of sudan     

Harold Harty  Hassan A. Hassan 《科学教学研究杂志》1983,20(9):851-859

An examination was made concerning the relationships between Sudanese secondary science teachers' pupil control ideology and their students' perceptions/observations of the psychosocial environment of their science classrooms. One hundred secondary science teachers were classified as possessing humanistic (N = 20) or custodial (N = 20) control ideologies. A class (N = 40) of students was randomly selected for every teacher in both groups. The findings revealed that no significant relationships existed between the control ideologies of the teachers and their students' perceptions/observations of the classroom environment. Custodialism in control ideology was significantly related to the classroom environment psychosocial aspect of low “support.” Discussion and implications of the findings have been approached from both Sudanese and American perspectives.  相似文献   

Applying the International Medical Graduate Program Model to Alleviate the Supply Shortage of Accounting Doctoral Faculty*     

Hassan R. HassabElnaby  David D. Dobrzykowski  Oanh Thikie Tran 《Decision Sciences Journal of Innovative Education》2012,10(2):271-294

Accounting has been faced with a severe shortage in the supply of qualified doctoral faculty. Drawing upon the international mobility of foreign scholars and the spirit of the international medical graduate program, this article suggests a model to fill the demand in accounting doctoral faculty. The underlying assumption of the suggested model is that there is enough qualified international accounting doctoral scholars who are willing to work in the United States because of natural and artificial benefits, such as the existence of national innovation, knowledge‐intensive clusters system, favorable working conditions, and career and earning prospects. A 10‐week International Accounting Post‐Doctoral Program (IAPDP) is designed to prepare academically competent international accounting faculty to be qualified to work in the United States at AACSB International‐accredited institutions. A survey was employed to examine the viability of the proposed model. Our results indicate that qualified international accounting doctoral scholars are interested in the suggested model and the nondoctoral U.S. accounting programs will represent the major job market for these IAPDP graduates. This article should be of interest to accounting educators, business schools, the American Institute of Certified Public Accountants (AICPA), the Association to Advance Collegiate Schools of Business (AACSB) International, and the American Accounting Association (AAA).  相似文献   

Testing the mediating role of teachers’ self-efficacy beliefs in the relationship between sources of efficacy information and students achievement     

Fatemeh Shaterian Mohamadi  Hassan Asadzadeh 《Asia Pacific Education Review》2012,13(3):427-433

The purpose of this study is to test the mediating role of teachers?? self-efficacy beliefs in the relationship between sources of efficacy information and students achievement. For achieving this aim, this study suggests two alternative models, tested by Structural equation modeling (SEM) technique. In the first model, sources of efficacy information and teachers?? sense of self-efficacy independently influenced student achievement. In second model, we examined a dependent 2-factor model, consisting of: (a) antecedent variable: sources of efficacy information, (b) mediator variable: teachers?? sense of self-efficacy, and (c) criterion variable: student??s achievement. Among 284 teachers who participated in this study, Sources of the Self-Efficacy Inventory (SOSI) and Teachers?? Sense of Efficacy Scale (TSES) were distributed. Findings of this study indicated that between two suggested models, the dependent model showed the best overall fit to the data. In this model, teachers?? self-efficacy had mediational role between sources of teachers?? self-efficacy and student??s achievement.  相似文献   

Forecasting approaches in a higher education setting     

Bousnguar  Hassan  Najdi  Lotfi  Battou  Amal 《Education and Information Technologies》2022,27(2):1993-2011

Education and Information Technologies - Forecasting the enrollments of new students in bachelor’s systems became an urgent desire in the majority of higher education institutions. It...  相似文献   

Organization,management and academic problems in the Arab University: The Kuwait University experience     

Hassan Ali Al-Ebraheem  Richard P. Stevens 《Higher Education》1980,9(2):203-218

The modern university is essentially an alien phenomenon in the Arab world where it lacks the societal support base enjoyed by the western university. Moreover, many of the new Arab universities, like Kuwait University, established in 1966, were either modeled after the French influenced Egyptian university — in-turn based on semi-independent colleges — or received their initial administrative and teaching faculty from Egypt. From this legacy is derived a significant share of the obstacles hindering organization and management reform. At the same time a variety of governmental traditions and regulations binding the university to general civil service regulations, an under-developed tradition of university autonomy and faculty participation in university decision-making, and a utilitarian concept of formal education which associates degress with employment status are among the more serious problems confronting the Arab university.Kuwait University can be seen as a microcosm of the organizational, management and academic problems encountered in the Arab university. Although Kuwait University enjoys adequate financial support and is not forced to accommodate an unreasonable number of students, it has peculiar problems arising from unequal admissions standards (Kuwaiti and non-Kuwaiti), traditional societal values, paucity of indigenous staff, inexperienced administrators, lack of balance in academic ranks, absence of tenure, a fragmented physical plant, inadequate support staff as well as insufficient societal understanding and support. Like most other Arab universities Kuwait University not only reflects the rudimentary societal development but is located on the frontier of that development. Given the small population of Kuwait, the university is especially important in this development role. As the university and its distinctive needs become better understood the total society will be strengthened.  相似文献   

The validity of multiple choice practical examinations as an alternative to traditional free response examination formats in gross anatomy     

Hassan Sami Shaibah  Cees P. M. van der Vleuten 《Anatomical sciences education》2013,6(3):149-156

Traditionally, an anatomy practical examination is conducted using a free response format (FRF). However, this format is resource‐intensive, as it requires a relatively large time investment from anatomy course faculty in preparation and grading. Thus, several interventions have been reported where the response format was changed to a selected response format (SRF). However, validity evidence from those interventions has not proved entirely adequate for the practical anatomy examination, and thus, further investigation was required. In this study, the validity evidence of SRF was examined using multiple choice questions (MCQs) constructed according to different levels of Bloom's taxonomy in comparison with the traditional free response format. A group of 100 medical students registered in a gross anatomy course volunteered to be enrolled in this study. The experimental MCQ examinations were part of graded midterm and final steeplechase practical examination. Volunteer students were instructed to complete the practical examinations twice, once in each of two separate examination rooms. The two separate examinations consisted of a traditional free response format and MCQ format. Scores from the two examinations (FRF and MCQ) displayed a strong correlation, even with higher level Bloom's taxonomy questions. In conclusion, the results of this study provide empirical evidence that the SRF (MCQ) response format is a valid method and can be used as an alternative to the traditional FRF steeplechase examination. Anat Sci Educ. © 2013 American Association of Anatomists.  相似文献