Chemical analyses of ancient glass findings excavated in the Venetian lagoon

Although Venice is regarded as being one of the most important centres of glass manufacture and trade in Western Europe, little is known about the origins of the Venetian glassmaking. Some archaeologists suggest there is a continuity in the history of glass making, in its transplantation from the Roman centres of the mainland (Altino and Aquileia), first to some islands of the lagoon, and later to the town. Some others, instead, think that there was no continuity at all and that the art of glassmaking was imported in Venice from the Islamic glass factories of the Middle East. Of great help in answering this and other technological questions is the information about the composition of ancient glass from well-dated excavations that allows to conclude on the early technology, sources of raw materials and long-distance trade. Some significant glass findings, including fragments of pots used for glass melting, were found on the island of Torcello and, more recently, in two emergency excavations in the historic centre of Venice. In this paper, the chemical composition of a large set of glass findings (and related materials) from the Venetian lagoon dating from the 7th to the 13th centuries is determined by X-ray microanalysis in order to throw new light on the glassmaking technology in the early centuries of the Venetian tradition. The results show that in this period there occurred a gradual transition from the Roman technique (a two-ingredient formulation with silica-lime sand and natron as a fluxer), towards the use of silica sand and soda plant ash. There is evidence, therefore, for a production continuity with the Roman period (melting pots and glass scraps with a natron-based composition), yet restricted to transparent blown items. No evidence was found for a local production of glass tesserae for the mosaics of the church of St. Maria Assunta in Torcello.     

用“中国故事”吸引“世界目光”——《Journal of Advanced Ceramics》发展历程回顾与思考

由清华大学出版社出版、创刊于2012年的国际学术期刊《Journal of Advanced Ceramics》[《先进陶瓷》(英文)]近年来发展迅速。本文对《先进陶瓷》(英文)发展历程进行了回顾与思考,着重介绍了期刊提升国际影响力的策略、措施和成果。《先进陶瓷》(英文)11年的发展表明：只要紧紧依托学科优势,努力讲好“中国故事”,就完全有可能打造出具有中国特色的世界一流科技期刊。     

数控机床滚珠丝杠副的改进方法

分析了滚珠丝杠副的原理及结构形式。详细阐述了适合高速化数控机床的滚珠丝杠副形式。提出了一种新的滚珠丝杠副的调隙和预紧方式—连续可调预紧装置。运用压电陶瓷传感器与压电驱动器结合的方法。通过此种方法可以直接测量预紧力,随时精确地补偿因磨损而增大的间隙。提高了数控机床的轴向刚度和定位精度。     

Quantification of urinary urate with alkylamine glass-bound uricase and arylamine glass-bound peroxidase

Uric acid in urine was analyzed using porcine liver uricase and horseradish peroxidase immobilized on alkylamine and arylamine glass beads (pore diameter 55nm) respectively. The minimum detection limit was 5.0mg/0.1 ml urine. The recovery of added uric acid was 92%. Within and between assay CVS were <1.3% and <5.3% respectively. A good correlation (r=0.93) was found between urinary urate values obtained by a commercial kit method and the present method. The uric acid in 24hr urine of apparently healthy adults and person sufering from various diseases was found to be 450 to 900mg/24hr, 659mg/24hr (range, mean) and 910–1400mg/24hr, 1145 mg/24hr (range, mean) respectively with the present method.     

ZrO_2纳米复合粉末制备及其应用

ZrO2纳米复合粉末具有高比表面积和高活性等特性,可以显著提高催化剂效率,因而其纳米微粒在催化方面的应用很广.并且获得的高纯、超细、均匀的ZrO2复合粉末还是制备优良性能的ZrO2陶瓷材料的关键.本文介绍ZrO2纳米粉末的制备及其在工业生产上的应用.     

Optimal control of end-port glass tank furnace regenerator temperature based on artificial neural network

1 Introduction1 The principle controlled target of an end-port glass tank furnace regenerator is the melting temperature which is regulated by the flow of oil or gas. The disturbances stem from feed-in glass powder, the pressure, value and atomization of fuel, the secondary wind, the tank furnace pressure, etc. Among them, some can be controlled and some cannot. In order to keep the temperature steady, a cascade ratio regulating system is designed, in which the temperature adjustment functions…     

Between al-Andalus and Genoa: The “Embriaci Tower” Lustreware

This article examines a set of lustreware pottery discovered in the fill of the tower belonging to the Genoese family, the Embriaci. The finds are datable to the mid-thirteenth century, characterised by decorative patterns which are atypical in lustreware production in al-Andalus, though some comparisons can be drawn with the decorative patterns of the “vasos de la Alhambra” and the pottery known as “nazarí primitive”. The context of the discovery in Genoa will briefly be outlined, including the story of the family settlement (Part 1), the stratigraphic sequence (Part 2), and the stylistic connections to other pottery characterising it (Part 3). The formal and decorative elements characterising the lustreware pottery found in the Embriaci Tower will then be examined and compared (Part 4) with finds from the Upper Tyrrhenian region (Provence, Savona, Pisa). Part 5 will suggest that the finds are a specific type of decorated lustreware produced in the thirteenth century in al-Andalus (Murcia, Málaga and Almería). The concluding part (Part 6) will investigate the meaning of the presence of the set of imported ceramics in the “curia” of the Embriaci family in Genoa.

This type of pottery has only been discovered hitherto in excavation finds and architectural contexts (the so called “bacini”) in Italy and France. The identification of decorative and formal elements characterising this “group” of pottery will allow the identification of examples of this production outside of Italy and France. The publication of the findings will provide new data to develop an archaeological overview of commercial contacts between al-Andalus and the Tyrrhenian area (Provence, Liguria, Tuscany) during the thirteenth century.     

陶艺教学中如何引导学生具象和抽象形态的创造性思维

陶艺教学中积极的引导学生具象和抽象创造性思维是陶艺教学的重点和难点,本文通过探索、比较、研究陶艺的具象和抽象形态,引导学生通过创新思维以进一步把握陶艺创作过程中造型、釉色、纹样、技艺之间语境的表达,使陶艺教学尽可能达到预期效果。     

外墙薄抹灰聚苯板保温技术

聚苯乙烯保温板（EPS）外墙外保温等节能施工技术具有较好的保温节能效果。对包括基层处理、保温板安装及固定、粘贴玻纤网、涂抹面胶浆等工艺的聚苯板外墙外保温施工过程进行了详细说明,交待了安全措施以及施工难题。指出材料是基础,施工是关键。     

二氧化钛粉体的制备及其在陶瓷生产中的应用

用均匀沉淀法和水热晶化法制备的二氧化钛粉体 ,在陶瓷生产中既可充当原料 ,又是陶瓷釉料的乳浊剂和抗菌陶瓷的光触媒剂