On Cocoons,Consciousness, and Courage: Preparing Justice-Oriented Teacher Educators Through Critical Pedagogies     

Jamy Stillman  Kathryn Struthers Ahmed  Erika Castañeda-Flores 《The Educational forum》2013,77(4):432-452

In this article, we share findings from a 3-year project in which novice teacher educators participated in Freirean culture circles and Boalian Theatre of the Oppressed (teatro) in order to critically explore the work of justice-oriented teacher education. Anchored in one of the project’s most resonant scenarios, the article illustrates how teatro cultivated among participants courage to confront injustice, while also shedding light on the complexities teacher educators may face when attempting to facilitate teacher learning, particularly when such learning is centered on equity and justice.  相似文献   

Dynamic voltage regulation and power export in a distribution system using distributed generation     

Aamir Hanif  Muhammad Ahmed Choudhry 《浙江大学学报(A卷英文版)》2009,10(10):1523-1531

The major aim of power quality （PQ） enhancing techniques is to maintain a specified voltage magnitude at a desired frequency for sensitive loads irrespective of faults on the power distribution network. The dynamic voltage restorer （DVR） is a device used to mitigate voltage sags to regulate load voltage. This paper presents a mathematical model for leading series voltage injection to mitigate sags thereby achieving the improvement of the utility power factor as well as power sharing between the DVR and utility. The power sharing will be as per requirement to compensate the sags considering the available distributed generation （DG）. The approach of mitigating voltage sags using the concept of leading series voltage injection is suitable for those locations where phase shift in the voltage will not cause any problem. The MATLAB/SIMULINK SimPowerSystem toolbox has been used to obtain simulation results to verify the proposed mathematical model.  相似文献   

The major players in adaptive immunity     

Asma Ahmed  Banishree Saha  Anand Patwardhan  Shwetha Shivaprasad  Dipankar Nandi 《Resonance》2009,14(6):610-621

Our immune system, by and large, does a fine job in protecting us from opportunistic and infectious microbes, potential carcinogens and allergens. It is therefore crucial to understand the organization of the immune network. This article focuses on some important features and key players involved in adaptive immune response. The first part of the article dealt with the humoral immune response mediated mainly by immunoglobulins produced by the B cells. The second part deals with T cells, the Major Histocompatibility Complex (MHC)-encoded molecules, and Recombination Activating Genes (RAG) responsible for generating diverse B-cell receptors (BCR) and T-cell receptors (TCR). With the advent of newer and smarter infectious agents, it is important to understand the working of the immune network as more research in this area may facilitate the development of better protective strategies.  相似文献   

Threshold behavior in a stochastic delayed SIS epidemic model with vaccination and double diseases     

Qun Liu  Daqing Jiang  Tasawar Hayat  Ahmed Alsaedi 《Journal of The Franklin Institute》2019,356(13):7466-7485

In this paper, we investigate the threshold dynamics of a stochastic delayed SIS epidemic model with vaccination and double diseases which make the research more difficult. We establish sufficient conditions for extinction and persistence in the mean of the two diseases. We also obtain the threshold between persistence in the mean and extinction of the stochastic system. It is shown that: (i) time delay and environmental white noise have important effects on the persistence and extinction of the two diseases; (ii) the two diseases can coexist under certain conditions. Finally, some numerical simulations are provided to demonstrate the analytical results.  相似文献   

Graph theory-based finite-time synchronization of fractional-order complex dynamical networks     

Hong-Li Li  Jinde Cao  Haijun Jiang  Ahmed Alsaedi 《Journal of The Franklin Institute》2018,355(13):5771-5789

This paper considers the finite-time synchronization problem for a class of fractional-order complex dynamical networks (FOCDNs). By utilizing the properties of fractional calculus and fractional-order comparison principle, we propose a new lemma. Base on the new lemma, some analysis techniques and algebraic graph theory method, some novel criteria are given to ensure finite-time synchronization of FOCDNs, and the upper bound of the setting time for synchronization is estimated. At last, numerical simulations are given to verify the effectiveness of the obtained results.  相似文献   

An optimization methodology of susceptance variation using lead-lag controller for grid connected FSIG based wind generator system     

Ashik Ahmed  Md. Mehedi Hassan Galib  Shafi Md. Kawsar Zaman  Golam Sarowar 《Journal of The Franklin Institute》2018,355(1):197-217

In wind power system, low frequency oscillations are observed due to imbalance between mechanical input and electrical output. Hence, variable susceptance controllers are being adopted to mitigate these oscillations. However, improper modulation of control parameters also leads to system instability. Therefore, we propose an optimization methodology for mitigating low frequency oscillations in wind power generation system. To visualize our methodology, we use a lead-lag type variable susceptance controller for fixed speed induction generator (FSIG) based wind generation system. Then, we optimize gain and time constants of lead-lag controller using three optimization algorithms: particle swarm optimization (PSO), genetic algorithm (GA), and flower pollination algorithm (FPA). Later, we perform non-linear time domain simulation and quantitative analysis to find average fitness, standard deviation, run time, and iteration number for these optimization algorithms. Moreover, non-parametric statistical analysis, such as Kolmogorov–Smirnov and Wilcoxon signed-rank tests are employed for identifying statistically significant differences among these algorithms.  相似文献   

Programme Quality Assessment by the Implication of Variable Entry Qualifications on Students' Performance     

Rahidzab Talib  Razidah Ismail  Roziah Mohd. Janor  Azni Zain Ahmed  Syed Abdul Kader Aljunid 《Assessment & Evaluation in Higher Education》1999,24(2):205-213

Since its inception 30 years ago, the then Department of Engineering Science, Institut Teknologi MARA (ITM) was given the responsibility of preparing all the students in the first year engineering programmes by giving enough knowledge in basic science and mathematics. The nation's vision to become a fully‐industrialised economy by the year 2020 required all institutes of higher learning (IHLs) in Malaysia to increase their intake of students in the science and technology courses, especially in engineering. However, at the upper secondary education level, students have the freedom to choose between the science‐based or non‐science combination of subjects. This has led to a dearth of science‐based students enrolling in IHLs. Because ITM believes that it is possible to educate individuals from various backgrounds, the engineering courses are open to students with a variety of academic qualifications. Special bridging courses were designed and created for such students since late 1996. The success or failure of the new courses can be assessed after the students have gone through the proper first year engineering courses which consist of Mathematics, Physics and Chemistry. This paper reports on a pilot study on the pioneer groups of students with variable entry qualifications to assess the effectiveness of the courses. The study involved the analysis of the students’ examination results as a performance indicator, and it was found that the bridging programme for non‐science students needed to be redesigned. It is also proposed that to improve the quality of the programme, and hence students’ performance, a regular review be conducted, student support activities be continued and to expand the use of self‐study materials.  相似文献   

Looking perfect: Instagram use in a Kuwaiti cultural context     

Ali A. Al-Kandari  Fahad Y. Al-Sumait  Ahmed Al-Hunaiyyan 《Journal of International and Intercultural Communication》2017,10(4):273-290

This study surveys 539 Arab university students to examine gender motivational differences in Instagram use, exploring the Self-Perfectionist Personality concept and usage activities that best predict a Self-Presentation motive on Instagram. While both genders utilized Instagram mainly for Entertainment, they varied on the priority of other motives. Females were less likely to have public accounts, post personal pictures, and disclose personal information. Also, self-perfectionists of both genders excessively edited their personal pictures before posting them and were more likely to use Instagram for Self-Presentation. Outcomes are discussed in the light of the influences of culture and gender roles in Kuwait.  相似文献   

Book reviews     

Victoria J. Baker  Manzoor Ahmed  Ian Birch  Birgit Brock-Utne 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1992,38(2):195-201

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Childhood Problems in a Sudanese City: A Comparison of Extended and Nuclear Families     

Ahmed M. El Hassan Al Awad  Edmund J. S. Sonuga-Barke 《Child development》1992,63(4):906-914

The relation between emotional and social development and family structure in the Sudanese capital, Khartoum, was examined. Children between the ages of 4 and 9 living in extended and nuclear families were compared on mothers' ratings of a range of childhood problems. Analysis revealed that children in nuclear families had more conduct, emotional, and sleep problems, poorer self-care, and were more likely to be overdependent than those living in extended families. They were also less likely to be breast fed, to be weaned later, and to have grandmothers involved in child care. Linear multiple regression revealed that, of these 3 childcare factors, grandmother's involvement was the strongest predictor of normal social and emotional adjustment. The possible protective characteristics of the extended family are discussed in relation to the importance of the grandmother as maternal advisor, social support, and socialization agent.  相似文献