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排序方式: 共有133条查询结果,搜索用时 31 毫秒
81.
Mohammed Alshareef Nicholas Metrakos Eva Juarez Perez Fadi Azer Fang Yang Xiaoming Yang Guiren Wang 《Biomicrofluidics》2013,7(1)
The present work demonstrates the use of a dielectrophoretic lab-on-a-chip device in effectively separating different cancer cells of epithelial origin for application in circulating tumor cell (CTC) identification. This study uses dielectrophoresis (DEP) to distinguish and separate MCF-7 human breast cancer cells from HCT-116 colorectal cancer cells. The DEP responses for each cell type were measured against AC electrical frequency changes in solutions of varying conductivities. Increasing the conductivity of the suspension directly correlated with an increasing frequency value for the first cross-over (no DEP force) point in the DEP spectra. Differences in the cross-over frequency for each cell type were leveraged to determine a frequency at which the two types of cell could be separated through DEP forces. Under a particular medium conductivity, different types of cells could have different DEP behaviors in a very narrow AC frequency band, demonstrating a high specificity of DEP. Using a microfluidic DEP sorter with optically transparent electrodes, MCF-7 and HCT-116 cells were successfully separated from each other under a 3.2 MHz frequency in a 0.1X PBS solution. Further experiments were conducted to characterize the separation efficiency (enrichment factor) by changing experimental parameters (AC frequency, voltage, and flow rate). This work has shown the high specificity of the described DEP cell sorter for distinguishing cells with similar characteristics for potential diagnostic applications through CTC enrichment. 相似文献
82.
Mohammed Ibahrine 《Journalism Practice》2020,14(8):971-990
ABSTRACT This paper examines the emergence of a news ecosystem, focusing on Hespress, Morocco’s first, largest, and most popular news website and its current economic success. My analysis investigates Hespress’s emergence and growth into a significant source for news content, reaching an unprecedented number of readers in Morocco and abroad. This paper argues that the success of Hespress’s business model is grounded in a particularly well-developed understanding of social media, the changing habits of digital readers, and a strategic combination of investigative reporting and curated user-generated content. My findings, then, show how Hespress used a strategy that can serve as a sustainable revenue model which was diversified to include other sources of revenue such as e-commerce, branded events, and native advertising, combined with distribution strategies that rely heavily on social and other digital platforms. 相似文献
83.
Managing personal information such as to-dos and contacts has become our daily routines, consuming more time than needed. Existing PIM tools require extensive involvement of human users. This becomes a problem in using mobile devices due to their physical constraints. To address the limitations of traditional PIM tools, we propose a model of mobile PIM agent (PIMA) that aims to improve PIM on mobile devices through natural language interface and application integration. We conducted a user study to evaluate PIMA empirically with prototype systems. The results show that mobile PIMA improved perceived usefulness, ease-of-use, and efficiency of PIM on mobile devices, which in turn accounted for positive attitude and intention to use the system. The findings of this study provide suggestions for designing and developing PIM applications on mobile devices. 相似文献
84.
Ahmad Sakr Ahmad M. El-Nagar Mohammad El-Bardini Mohammed Sharaf 《Journal of The Franklin Institute》2018,355(15):7201-7225
This paper proposes a fuzzy model predictive control (FMPC) combined with the modified Smith predictor for networked control systems (NCSs). The network delays and data dropouts are problems, which greatly reduce the controller performance. For the proposed controller, the model of the controlled system is identified on-line using the Takagi – Sugeno (T-S) fuzzy models based on the Lyapunov function. There are two internal loops in the proposed structure. The first is the loop around the FMPC, which predicts the future outputs. The other is the loop around the plant to give the error between the system model and the actual plant. The proposed controller is designed for controlling a DC servo system through a wireless network to improve the system response. The practical results based on MATLAB/SIMULINK are established. The practical results are indicated that the proposed controller is able to respond the networked time delay and data dropouts compared to other controllers. 相似文献
85.
Mohammed Abu-Nimer Ilham Nasser 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2017,63(2):153-167
Following the events of 9/11, many misconceptions entered the policy-making platform with regard to the need for education reforms in the Muslim world. Based upon Western cultural and societal norms and increased scepticism of the role of religion in violence, these assumptions have triggered a strong wave of calls for a top-down approach to reform formal state schools in predominantly Muslim countries, These calls often meet with resistance at national and community levels. This article seeks to examine these misconceptions and investigate why educational reform efforts through top-down frameworks which are especially motivated by countering violent extremism or terrorism have had only limited success. Many major international intergovernmental organisations, non-governmental organisations and governments have invested time and effort into education measures aiming to build peace and coexistence in Muslim countries, but they have been unable to build a relationship of trust with community leaders and school authorities. The authors argue that the main reason for defiance is reformers’ failure to closely examine the cultural context of their chosen setting and work with existing tools and local institutions. Illustrating their point with a case study of an intervention carried out in informal Qur’anic schools in Niger, West Africa, the authors offer an alternative method which fosters changes from within. They argue that this model has a better chance of sustainability and could thus be used as the basis for future interventions. 相似文献
86.
Emokpae M. A. Das S. C. Orok T. Mohammed A. Z. Hassan S. A. 《Indian journal of clinical biochemistry : IJCB》2004,19(1):62-66
This study was conducted to investigate the diagnostic performance characteristics of prostate specific antigen (PSA) by comparing
serum PSA value with histological findings in patients suspevted of having prostate cancer in Aminu Kano Teaching Hospital.
Nigeria. Clinical and Laboratory records were examined and collated for serum PSA values, together with histological findings
of biopsy specimen, clinical diagnosis, age of patients, and mode of presentation. The serum PSA values were determined by
ELECSYS 1010 autoanalysers Roche, Germany based on electrochemiluminescence immunoassay technique. The results show that serum
PSA values increase with age in the assymptomatic non-cancer patients who came for medical check up but were within normal
limit. In prostatic disease conditions PSA values were raised in benign prostatic hyperplasia 35.957± 4.0315ng/ml, in undifferentiated
carcinoma 56.22±4.295ng/ml and adenocarcinoma >100ng/ml as compared to the normal range (0–4ng/ml). These cases were confirmed
by histological diagnosis. It is concluded that PSA evaluations is a sensitive marker for prostate cancer but because of various
other conditions that affect serum PSA concentration, other methods of investigations such as Digital Rectal examination,
Trans Urethral Ultra-Sonography and histological examination should be combined to confirm diagnosis. Prognosis of patients
will be better if early diagnosis is made. 相似文献
87.
Khaled M. Gharaibeh Hazem Kaylani Noel Murphy Conor Brennan Awni Itradat Mohammed Al-Bataineh 《European Journal of Engineering Education》2015,40(3):267-284
This paper presents a curriculum design approach for a Masters Programme in Telecommunications Management based on demand data obtained from surveying the needs of potential students of the proposed programme. Through online surveys disseminated at telecom companies in Jordan, it was possible to measure the demand for such a programme and to determine the required programme contents and specifications. The curriculum design is based on definition of programme outcomes and on using a house of quality approach (HOQ) to determine the list of courses required in the programme. Surveyed competencies are mapped to a long list of proposed courses in a HOQ in order to determine the importance of each of these courses. A final list of core and elective courses is then developed considering the contribution to programme outcomes and the academic standards. 相似文献
88.
Köse Mustafa Koçyiğit Mehmet Erdem Cahit Jega Idris Mohammed 《Education and Information Technologies》2021,26(4):4307-4328
Education and Information Technologies - This study aims to evaluate current locations of preschool education institutions and suggest alternative spatial arrangements in the Afyonkarahisar... 相似文献
89.
Mohammed J. Arif Mohammed Makki Sibai Mubarak Saad Sulaiman 《International Information and Library Review》1998,30(4):341-365
The last 20 years have seen a marked increase in co-operation among Saudi medical libraries, with inter-library loan service at the forefront. This is an investigation of the current situation of co-operative inter-lending and resource sharing among medical libraries in the Kingdom of Saudi Arabia. The study discusses various methods for providing inter-library loan service including direct inter-lending, lending through union catalogs, and centralized lending. Other resource sharing activities are also described. The case study methodology was employed. Documents, interviews, and personal conversations were utilized to provide needed information. A number of medical libraries were chosen, and their inter-library loan requests for the year 1995 were thoroughly investigated. Results are analyzed, and some concluding remarks for future action are presented. 相似文献
90.
Anna Loe Russell T. P. Yeatman Ray E. Bruce Gurney Chambers Mohammed Sabie Josephine H. Magnifico 《Peabody Journal of Education》2013,88(3):184-185
Educational Sociology: A Subject Index of Doctoral Dissertations Completed at American Universities, 1941–1963. Francesco Cordasco and Leonard Covello, compilers. (New York: Scarcecrow Press, 1965. Pp. 226. $5.00.) The Prospective Teacher's Knowledge of Library Fundamentals. Ralph Perkins. (New York: Scarcecrow Press, 1965. Pp. 202. $4.50.) Adolescents and the Schools. James S. Coleman. (New York: Basic Books, 1965. Pp. 121. $4.50.) The Emergent in Curriculum. Gail M. Inlow. (New York: John Wiley and Sons, Inc., 1966. Pp. 353. $6.95.) Studying History: How and Why. Robert V. Daniels. (New York: Prentice‐Hall, 1966. Pp. 105. $1.50. Paperback) Physical Education: A Problem‐Solving Approach to Health and Fitness. Perry B. Johnson and others. (New York: Holt, Rinehart and Winston, 1966. Pp. 486. $6.95.) Teaching Contemporary Mathematics in the Elementary School. Charles F. Howard and Enoch Dumas. (New York: Harper and Row, 1966. Pp. 309. $7.50.) Education in Metropolitan Areas. Robert J. Havighurst. (Boston: Allyn and Bacon, 1966. Pp. 260. $3.50 Paperback) The Adolescent Experience. Elizabeth Douvan and Joseph Adelson. (New York: John Wiley and Sons, 1966. Pp. 471. $7.95.) 相似文献