Medieval and renaissance glass technology in Valdelsa (Florence). Part 1: raw materials, sands and non-vitreous finds     

U. Casellato  F. Fenzi  P. Guerriero  S. Sitran  P. A. Vigato  U. Russo  M. Galgani  M. Mendera  A. Manasse 《Journal of Cultural Heritage》2003,4(4):337-353

A significant number of archaeological finds of the 13th–16th century from the Tuscan sites of Germagnana and Gambassi in Valdelsa—FI, was studied by different physico-chemical investigations (SEM–EDS, ICP, Mössbauer spectroscopy, XRD, XRF, TG-DTA) in order to contribute to clarify the production methodology and the pre-industrial glass manufacture technology. The studied samples are mainly non-vitreous finds as production waste, refractory materials, crucibles and raw materials; also vitreous finds as frits, skims, glasses (glass masses, glass working waste and finished products) have been taken into consideration. The obtained petrographic and physico-chemical data strongly suggest that both Gambassi and Germagnana glass manufactures were strictly connected with the sources of vitrifiable materials, situated in Tuscan sand quarries. In particular a comparison between sands from the neighbouring quarries and appropriate finds of the two archaeological sites evidences that the employed vitrifiable materials possibly belong to La Casina La Cava resort. The archaeological classification, based on macroscopic observation and stratigraphic position, was compared and verified with the scientific classification of the examined finds of Germagnana and Gambassi sites based on their composition, morphology and physico-chemical properties.  相似文献   

勇于探索 执着追求——读张汝舟先生的语法论著     

廖定文  王莉娟 《贵阳金筑大学学报》2003,(1)

张汝舟先生语法论著强调汉语特点;重视语感;勇于探索;简明扼要。  相似文献   

Response to Siegel     

J F Carlisle 《Journal of learning disabilities》1990,23(5):267-9, 319

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Observations on siemens' unit     

F. Kohlrausch 《Journal of The Franklin Institute》1871,91(5):349-355

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Development of maximal oxygen uptake in young elite male cross-country skiers: a longitudinal study.     

F Ingjer 《Journal of sports sciences》1992,10(1):49-63

The aim of this study was to investigate the effects of extensive endurance training (15-25 h per week) on the development of maximal oxygen uptake (VO2 max) in boys from puberty. Maximal oxygen uptake was measured a number of times each year from the age of puberty and for the next 6-9 years in seven young male elite cross-country skiers. Mean VO2 max was measured as 76.3 and 80.1 ml kg-1 min-1 at the ages of 14 and 15 years respectively. Despite the fast rate of growth during puberty, maximal aerobic power showed seasonal variations from the age of 14, reaching a plateau at the age of 15, whereas VO2 max (ml kg-2/3 min-1) increased continuously. It is concluded that, during puberty, boys probably attain significant increases in VO2 max when appropriate amounts of endurance training are undertaken.  相似文献   

普通高校篮球选修课教学模式设想     

廖小林 《体育科技》2002,23(4):73-74

构建一种具有现代教育气息的、科学性程度高的普通高校篮球选修课教学模式 ,是普通高校体育选修课目前面临解决的问题之一。  相似文献   

Epistemological correctness in English 101     

Thomas F. Bertonneau 《Academic Questions》1997,10(1):66-78

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Ensuring Content‐Area Learning by Secondary Students with Learning Disabilities     

Donald D. Deshler  Jean B. Schumaker  B. Keith Lenz  Janis A. Bulgren  Michael F. Hock  Jim Knight  Barbara J. Ehren 《Learning disabilities research & practice》2001,16(2):96-108

Three factors tied with secondary student success in content‐area reading are demonstrated: (a) validated teacher‐focused and student‐focused interventions, (b) integrated and comprehensive service delivery systems, and (c) well‐designed, data‐based professional developmental programs. Difficult challenges face secondary students with LD and their teachers with regard to these students’ participation and success in required general education classes. Recently, instructional methods and materials have been developed and validated for promoting these students’ success. Some of them focus on how general education teachers plan and teach their content‐area courses; others focus on giving students the strategies they need to respond independently to the demands of their courses. This article describes these instructional methods, a service‐delivery model for implementing these interventions in secondary schools, and professional‐development mechanisms and administrative support that must be in place for the model to be maintained effectively.  相似文献   

Antecedent and consequent stimuli in teacher-child dyads     

M F Harrison  T L Layton  T D Taylor 《American annals of the deaf》1987,132(3):227-231

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“红军股票”和红军临时借谷证     

廖穆赓 《收藏》2006,(3):124-124

“红军股票” 1934年1月23日，时任中华苏维埃共和国临时中央政府主席的毛泽东在江西瑞金召开的第二次全国工农代表大会上作了《我们的经济政策》的报告，他指出，在苏区要集中一切社会力量和资源，大力发展经济建设，以保障供给。这是对敌作战的需要。提出“我们的经济建设的中心是发展农业生产，发展工业生产，发展对外贸易和发展合作社”。为了给革命战争和发展生产募集资金，苏区中央政府鼓励中国工农红军参资入股。同年3月，存中央苏区建立了“中国工农红军消费合作社”，负责并规范各地“红军股票”的发行和发放工作。这次发行的“红军股票”为记名式，股东为红军战上。  相似文献