黑葵花籽皮黑色素提取及影响其稳定性因素分析

采用碱性溶液提取、酸水解沉淀等工艺分离纯化了黑葵花籽皮色素，呈天然黑色，其得率为12．5％（以粗品于原料为准），并对该色素的理化性质等进行了较系统的研究．结果表明：黑葵花籽皮黑色素耐光、耐热；对还原剂较稳定，对强氧化剂不够稳定；碱性条件下较稳定；Cu^2＋，Ca^2＋，Na^＋,Zn^2＋等金属离子对该色素有护色、增色作用，Fe^3＋，Al^3＋虽有减色作用，但不明显；是一种性能优良的天然黑色素。     

The early assessment conundrum: Lessons from the past,implications for the future

The early childhood educational field has garnered attention with initiatives to foster skill acquisition in young children prior to kindergarten entry. These initiatives, in conjunction with the rigorous demands of curricular reform and a burgeoning accountability movement, invoke questions regarding the adequacy of the instruments used to assess young children and the inherent difficulties in conducting such assessments. Because the effectiveness of education relies critically on the sound diagnoses of children's readiness for learning and the measurement of their subsequent progression throughout the schooling process, critical issues in early assessment must be addressed. An examination of past practices was synthesized with recent research to focus awareness on the insufficient content domain, restrictive context, adverse timing and questionable psychometric properties, specifically the inappropriate norms and low predictive validity, of many instruments. Both the implications of and compensatory strategies for each issue are considered. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 737–749, 2004.     

Immigrant Chinese Mothers’ Socialization of Achievement in Children: A Strategic Adaptation to the Host Society

Academic socialization by low‐income immigrant mothers from Mainland China was investigated in two studies. Immigrant Chinese mothers of first graders (n = 52; M_age = 38.69) in the United States (Study 1) and kindergartners (n = 86; M_age = 36.81) in Hong Kong (Study 2) tell stories that emphasized achieving the best grade through effort more than did African American (n = 39; M_age = 31.44) and native Hong Kong (n = 76; M_age = 36.64) mothers, respectively. The emphasis on achievement was associated with mothers' heightened discussion on discrimination (Study 1) and beliefs that education promotes upward mobility (Study 2), as well as children's expectations that a story protagonist would receive maternal criticism for being nonpersistent in learning (Study 2).     

Nationalistic education as the focus for civics and citizenship education : The case of Hong Kong

Civic education has been assigned the mission of preparing critical thinking, responsible, participating, multidimensional citizens and is also used to serve the function of instilling a sense of national identity, loyalty to the nation state and patriotism In 1996, before the return of sovereignty of Hong Kong to China, the Hong Kong Education Department published theGuidelines in Civic Education for School (1996), which includes education for democracy, human rights education, global education and nationalistic education This survey adopted an amalgamate framework of five types of nationalistic education to study the understanding of nationalistic education of civic educators in secondary schools in Hong Kong The initial findings showed that the civic educators were basically strongly eclectic in terms of education for cosmopolitan, civic, and cultural nationalism and moderately eclectic in terms of anti colonial nationalism but rejected education for totalitarian nationalism This eclectic understanding can be said to be heading towards a more liberal, rational, open and inclusive type of nationalistic education, which is compatible with a cosmopolitan and pluralistic society such as Hong Kong     

Differential contribution of psycholinguistic and cognitive skills to written composition in Chinese as a second language

Reading and Writing - This study examined the contribution of the constructs of orthographic processing (orthographic choice and orthographic choice in context), syntactic processing...     

Moving from a Personal to a Social Constructivist View of Learning: Implications for Support in the Student Teaching Experience 1

Recently, the school and co‐operating teachers have an increasingly important role, by offering stronger support during the teaching practice. Being congruent with similar developments in teacher education programmes in other countries, this development in Hong Kong is strengthened by research studies examining the process of learning to teach. By arguing that the process of learning to teach can be examined from a personal constructivist view of learning, this paper examines the experience from the student‐teachers’ perspective. The finding reports on the problems perceived by the student‐teachers during the student teaching practice and the support provided by the co‐operating teachers. The problems encountered and the support obtained were compared and contrasted to reveal the possible roles of the co‐operating teachers. The process of learning to teach is extended from a personal view to include support from the social milieu. This paper proposes to consider the process from a social constructivist view of learning. Drawing on the findings, it concludes with implications on how the school and the teacher education institute can collaborate and support the student‐teachers from a social constructivist view of learning.

     

Teachers’ cultural differences: case studies of geography teachers in Brisbane,Changchun and Hong Kong

The primary purpose of this exploratory study is to identify variations in the ways in which individual teachers in different educational contexts interpret their curriculum and plan their lessons and in particular to explore the possibility that cultural differences as identified by Hofstede (1991) may be a contributing factor to understanding how teachers understand their work. “Educational reform” has become a catchphrase in the Anglo-American world, including the United States, Canada, Australia, and England and Wales, as well as in the Confucian Heritage Areas such as Mainland China, Singapore, Hong Kong, and Taiwan. Across the world, the educational reform measures being implemented are surprisingly similar. This paper describes a study of how geography teachers in Queensland, Australia, Hong Kong, and Changchun, China, plan their lessons and curriculum. From classroom observations and interviews with the teachers involved, we confirmed marked differences in each location regarding their cultural traits of power distance, individualist and collectivist preference and uncertainty tolerance, and that these traits appear to be highly influential in their curriculum planning. Despite the small scale of this study, we contend that there are good reasons for caution before national education systems import policies and curriculum reform initiatives from other countries for unthinking adoption.     

Rows versus Tables. II. The Effects of Two Classroom Seating Arrangements on Classroom Disruption Rate,On‐task Behaviour and Teacher Behaviour in Three Special School Classes

Summary Seating arrangements in which children sat in rows and around tables were compared experimentally in three classes in a special school for behaviourally troublesome children with moderate learning difficulties. Children were observed daily in four two week phases: seated around tables, then in rows, again around tables, and finally again in rows. Percentage on‐task behaviour was recorded along with rate of pupil disruption and rates of teacher approval and disapproval. In all three classes on‐task behaviour doubled from around 35% to 70% as the conditions changed from tables to rows. Moreover, rate of disruption was three times higher in tables conditions. Teacher behaviour was also affected; positive comments increasing during rows whilst negative comments decreased. It is argued that these studies support the results of previous studies regarding the importance of ecological variables, such as seating, on classroom behaviour.     

Dynamics of Chinese nationalistic education in Hong Kong from 1945 to 2012

‘Chinese’ is an ambiguous term, depending on whether it is taken to describe a political, linguistic, or cultural entity. While the term has often been considered to represent a politically and culturally homogeneous national identity in recent decades, this article aims to challenge this notion by examining the characteristics and practices of nationalistic education in Hong Kong since 1945. It explores how national identity has been interpreted by different Chinese states over time through different educational policies and practices. Focusing on the evolution of nationalistic education in three phases, this article presents a detailed account and analyses different nationalist narratives over six decades. It describes how different political forces define themselves and come to terms with what are often dual or competing national identities. Historical examples illustrate the challenges in policies and practices of nationalistic education.