川陕省苏维埃铜元金属成分及相关问题分析

川陕省苏维埃铜元是第二次国内革命战争时期遗留下来的重要革命文物，它承载着中国共产党与川陕苏区人民英勇奋斗的光辉历程，本工作通过能量色散型X射线能谱(EDS)技术对二种面值、三个种类、九个版类的川陕省苏维埃铜元成分进行了研究，结合川陕省苏维埃铜元产地的历史变迁及版类的生产顺序，发现川陕省苏维埃铜元的含铜量整体上远高于晚清、民国典型黄铜元的铜含量，而稍低于典型红铜元的铜含量。随着生产时期向后推移，川陕省苏维埃铜元的含铜量逐渐增加并达到95%左右，而锌、铅、锡的含量则呈现出较明显的降低趋势。分析表明，川陕省苏维埃政府早期生产的大二百文铜元，中后期生产的部分无齿类小二百文铜元和繁体联五百文铜元极可能是采用红铜元、杂铜混合重铸的方式制造，而鼎盛时期生产的有齿类小二百文铜元和简体联五百文铜元则是合格的红铜元。这一动态变化趋势说明，苏维埃造币机构在铜元生产过程中，其原材料筛选标准逐渐明确并日趋严格，反映了苏维埃政府在铜资源管理与使用上逐渐趋于合理化。     

Early Ordovician conodonts from Zhejiang Province,southeast China and their biostratigraphic and palaeobiogeographic implications

Forty-two conodont species are documented from the Liuxia, Shijiatou and Jingshan formations in Zhejiang Province of southeast China, located palaeogeographically on the Jiangnan Slope offshore to the Yangtze Platform. From these faunas, eight successive conodont biozones of Tremadocian to middle Floian (Early Ordovician) age are recognized, including the Cordylodus lindstromi Biozone, Cordylodus angulatus Biozone, Chosonodina herfurthi Biozone, Paltodus deltifer Biozone, Paroistodus proteus Biozone, Triangulodus bifidus Biozone, Serratognathus diversus Biozone and Prioniodus elegans Biozone. Several zonal index species of the Baltoscandian succession—Paltodus deltifer, Paroistodus proteus and Prioniodus elegans—are described and illustrated in detail for the first time from South China. Co-occurrence of P. proteus and Serratognathus bilobatus in several samples below the appearance of P. elegans also confirms correlation of the S. diversus Biozone (basal Floian) with the upper P. proteus Zone of the Baltoscandian succession. These Zhejiang faunas are dominated by pandemic forms, and are similar to those of the Open-Sea Realm elsewhere, inhabiting deep, offshore environments.     

3D打印技术在龙门石窟金刚经洞修复中的应用

为了缓解龙门石窟金刚经洞因局部坍塌引起的水害、微生物等病害发育问题,利用3D打印技术对坍塌部位进行修复:修复部件以光敏树脂为打印材料,修复部件为空心结构以减轻荷载；对修复部件进行光场、温度场仿真设计,使洞窟内日光辐射强度降低至日光直射的50%~56%,窟内温度分布差值由6.6℃降低到1.9℃；修复部件采用S8801涂覆内外表面,S8801老化实验后主要性能保持率均大于90%,并采用玄武岩纤维与玻璃纤维增强修复部件内表面。经多次降雨后观察,龙门石窟金刚经洞由缺失导致的雨水倒勾等问题得到有效缓解。该工作为3D打印技术与不可移动石质文物修复工作结合奠定基础。