香草醛缩色氨酸与稀土镧、钕、钐、铈配合物的合成及表征     

阿米娜·买买提 《喀什师范学院学报》2002,23(6):39-42

合成了香草醛缩色氨酸席夫碱(简写为L)及其稀土La(III)、Nd(III)、Sm(III)、Ce(III)配合物,通过元素分析、摩尔电导、差热-热重分析、红外光谱、紫外光谱等手段.确定配合物为KRe(H2O)(NO3)·2H2O(Re=La,Nd,Sm,Ce).  相似文献   

Impact of light intensity on flowering time and plant quality of Antirrhinum majus L.cultivar Chimes White     

MUNIR Muhammad  JAMIL Muhammad  BALOCH Jalal-ud-din  KHATTAK Khalid Rehman 《浙江大学学报(A卷英文版)》2004,5(4)

Shades of different light intensities (29%, 43%, 54%, 60% or 68%) along with control (no shade) were studied to observe their effects on the flowering time and plant quality. A hyperbolic relationship was observed between different light intensities under shade, and time to flowering. The total number of flower buds showed a curvilinear relationship with light intensities. Growth parameters related to the plant characteristics such as plant height, leaf area and plant fresh weight were improved under shading treatments at the expense of flowering time and number of flower buds. However, both linear and polynomial models applied assumed that cultivar Chimes White was equally sensitive to light intensity throughout development.  相似文献   

键级和化合价的分子轨道理论   总被引：1，自引：0，他引：1  

A.B.Sannigrahi  Tapas Kar  杨金田 《湖州师范学院学报》1990,(5)

本文译自美国《Journal of chemical Education》1988年第8期.作者简介了密立根布居数分析法,并以此为基础讨论了键级和化合价,应用了别致的原子轨道线性组合分子轨道理论(LCAO—MO)的矩阵公式.最后给出了一些简单分子的计算结果,以说明这个理论的应用.  相似文献   

Modeling of a Sn-Based HTM-Free Perovskite Solar Cell Using a One-Dimensional Solar Cell Capacitance Simulator Tool     

Eli Danladi  Muhammad Kashif  Andrew Ichoja  Bikimi Bitrus Ayiya 《天津大学学报(英文版)》2023,29(1):62-72

Tin(Sn)-based perovskite solar cells(PSCs) have received increasing attention in the domain of photovoltaics due to their environmentally friendly nature.In this paper,numerical modeling and simulation of hole transport material(HTM)-free PSC based on methyl ammonium tin triiodide(CH₃NH₃SnI₃) was performed using a one-dimensional solar cell capacitance simulator(SCAPS-1D) software.The effect of perovskite thickness,interface defect density,temperature,and electro...  相似文献   

An assessment of the academic and social integration as perceived by the students in the University of Papua New Guinea     

Muhammad Abdul Mannan 《Higher Education》2001,41(3):283-298

This study assesses the current and ideal levelsof academic and social integration within the University of PapuaNew Guinea as perceived by the students. In order to reducestudent attrition through developing an appropriate attritionpolicy and improving services, a comprehensive picture of thecurrent and ideal academic and social integration climate in theUniversity of Papua New Guinea was necessary. Previousattrition/retention research has not adequately described thevarying degrees of group differences in students' integrationprocess. Using the Tinto model and research instruments thatoperationalised the model, an institutional academic and socialintegration assessment instrument was developed for measuring theperceived current and ideal integration climate. Respondent'sperceived ideal ratings for 24 items representing five dimensionsof academic and social integration were higher than for thecurrent ratings. Significant differences were found between thecurrent and ideal perceptions of student groups in respect of a)students' informal contact with faculty; b) faculty concern forstudents' development and teaching and c) extra curricularactivities. Differences were found between the perceived ratingsof student groups on the basis of year of studies. Implicationsfor policy directives and discriminatory service delivery arealso discussed.  相似文献   

Challenges of remote assessment in higher education in the context of COVID-19: a case study of Middle East College     

Guangul  Fiseha M.  Suhail  Adeel H.  Khalit  Muhammad I.  Khidhir  Basim A. 《Educational Assessment, Evaluation and Accountability》2020,32(4):519-535

Educational Assessment, Evaluation and Accountability - Due to the unprecedented COVID-19 incident, higher education institutions have faced different challenges in their teaching-learning...  相似文献   

Finite element simulation of stress intensity factors in elastic-plastic crack growth     

ALSHOAIBI Abdulnaser M. ARIFFIN Ahmad Kamal 《浙江大学学报(A卷英文版)》2006,7(8):1336-1342

INTRODUCTION The finite element method (FEM) has been widely employed for solving linear elastic and elas-tic-plastic fracture problems. The evaluation of stress intensity factors in 2D geometries by FEM is a tech-nique widely used for non-standard crack configura-tions. Basically, there are two groups of estimation methods, those based on field extrapolation near the crack tip (Chan et al., 1970; Shih et al., 1976) and those using the energy release when the crack propagates. However…  相似文献   

The rates and correlates of the exposure of Palestinian adolescents to family violence: toward an integrative-holistic approach     

Haj-Yahia MM  Abdo-Kaloti R 《Child abuse & neglect》2003,27(7):781-806

OBJECTIVES: First, to examine the rates of Palestinian adolescents' exposure to (i.e., witnessing and experiencing) different patterns of psychological aggression and physical violence in their families of origin; and second, to examine the correlation between this exposure and sociodemographic characteristics, parents' psychological adjustment problems, and family exposure to political stressors. METHOD: A cross-sectional survey was carried out among a sample of 1,185 Palestinian secondary school students. RESULTS: The study reveals very alarming rates of witnessing interparental and parent-to-sibling aggression and violence, and high rates of experiencing aggression and violence by parents and siblings during childhood and adolescence. In addition, these rates were found to be intercorrelated, and correlated significantly with several sociodemographic characteristics such as parents' levels of education, place of residence, family size, religious affiliation, family income, and housing conditions, as well as with parents' psychological adjustment problems and with family exposure to political stressors. CONCLUSIONS: The results of the study reveal strong evidence that emphasizes the importance of studying violence in the family from an integrative, comprehensive, and ecological perspective that incorporates intrapersonal traits, family stress theory, family resources theory, social learning theory, and sociological and environmental factors, to explain the risk factors and predictors of violence in the family.  相似文献   

SOCIAL AND PERSONALITY CHARACTERISTICS OF GIFTED STUDENTS     

Muhyieddeen Sh. Touq  Nawal H. Kamal  Alia T. Fada 《High Ability Studies》1993,4(1):39-47

This study aimed at investigating the relationship between intellectual, social, personal and personality variables of academically gifted secondary school students. A total of 297 tenth grade boys and girls were identified on the basis of three main criteria: 1. Academic achievement with special emphasis on Arabic language, science and math scores; 2. Behavioural traits; 3. General mental ability and general adjustment. Data related to socioeconomic status and personal characteristics were also collected. Results of the analysis of variance showed that there were significant differences between gifted and nongifted groups in general mental ability, achievement, general adjustment, behavioural traits, personal and social variables, in favour of the former.  相似文献   

Pedagogy and possibility thinking in the early years     

Teresa Cremin Author Vitae  Pamela Burnard Author Vitae Author Vitae 《Thinking Skills and Creativity》2006,1(2):108-119

Connecting to current work in the area of creative pedagogies, this paper reports findings of an exploratory study that sought to identify what characterises possibility thinking in young children's learning experiences and how teachers’ pedagogical practice fosters this critical aspect of creativity. It focuses in particular on pedagogy, seeking to demonstrate how approaches adopted facilitated children's possibility thinking. Possibility thinking has been conceptualised as being central to creative learning although its role, as manifest in the learning engagement of children and the pedagogical strategies of practitioners has not been fully illuminated. The co-participative research team involved in this study comprised staff in an early childhood centre, in an infant and a primary school, working collaboratively with three university-based researchers. The 12-month long segment of a longer study employed various data collection methods including video-stimulated review (VSR) to facilitate reflection, critical conversations, classroom observation, interviews and examination of planning documents. The paper illuminates the perspectives and embedded values that the teachers expressed whilst reflecting upon their practice, and highlights common pedagogical themes, including the practice of ‘standing back’, profiling learner agency and creating time and space. Particular strategies were employed by each of the teachers. These approaches appeared to foster possibility thinking in young learners. In addition, the paper considers the development of the teachers’ thinking through the phases of the research process and presents a model for conceptualising a pedagogy of possibility thinking.  相似文献