皖东滁州、上腰铺埃达克质侵入岩年代学及地球化学特征：岩石成因与成矿意义

皖东的滁州、上腰铺岩体位于扬子地块东缘、毗邻郯庐断裂带东侧,与之伴生有一些铜（金或铁）矿化.它们的黑云母的40Ar-39Ar定年结果分别为127.17±0.40Ma,129.90±0.23 Ma.滁州、上腰铺侵入岩在地球化学特征上与埃达克岩基本一致：如SiO2＞56%,高Al2O3（14.84%～16.38%）、Sr（369×10^-6～1335×10^-6）、Sr/Y（43～185）与La/Yb（22～44）,但低Y（5.51×10^-6～11.0×10^-6）,Yb（0.51×10^-6～1.09×10^-6）,无明显Eu异常-正的Eu异常（δEu=-0.75～1.28）.另外,岩体中部分样品具有较高的MgO（2.23%～5.25%）、Mg#（53～68）和Cr（89.6×10^-6～206×10^-6）、Ni（43.0×10^-6～72.0×10^-6）,类似于高镁安山岩.这两个岩体的Nd-Sr同位素特征为：（^87 Sr/^86 Sr）I=0.7060～0.7067,εNd（t）=-11.53～-14.07,说明其由俯冲洋壳熔融形成的可能性较小.我们认为,滁州、上腰铺埃达克质侵入岩可能由拆沉下地壳熔融形成,熔融产生的岩浆在穿过上覆地幔的过程中,与地幔橄榄岩发生强烈相互作用,一方面,由于地幔橄榄岩的混染而使得埃达克质岩浆的MgO、Cr和Ni含量显著增高;另一方面,岩浆中的Fe2O3可能加入到地幔中,导致地幔的氧逸度（fo2）,）增高,地幔中金属硫化物被氧化,地幔中亲铜元素则以硫酸盐的形式进入熔体中.富含Cu、Au等成矿物质的熔体在快速上升到地壳浅处时,可能由于温度、压力或氧逸度（fo2）的降低,释放出Cu、Au等成矿物质,导致矿化.     

Surface Investigation of Metal Threads and Solid Metals of Ottoman Textiles in the Topkapi Palace Museum

ABSTRACT

We analyzed 53 historical textile samples from a collection of caftans and brocades dating between the sixteenth and nineteenth century in the Topkapi Palace Museum (TPM) by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX). Data were collected on the type, dimensions, elemental composition, and level of corrosion. The technique is presented in this work as an efficient and micro-destructive tool for the characterization of the structure of historical metal threads. SEM-EDX analysis for different energies was performed on a selection of gold and silver threads belonging to the historical textiles. The results were interpreted via laboratory prepared samples of gilt Ag and sulfur reacted Ag at different thicknesses for Au and Ag₂S layers respectively. A series of Au–Ag alloys for different Au/Ag ratios were prepared for comparative analysis. The threads were made of metal strips wound around a silk core. Metal wires and flat strips were also used. The use of differential energies allowed for differentiating strips and wires made of homogeneous silver and gold alloys from the ones coated with a thin gold layer. Analysis of EDX data revealed that the Au film thickness was very thin (10–60?nm). Formation of Ag₂S layers over the thin Au film as thick as 1.5?µm was taking place. Formation of thinner Ag₂S layers over non-gilt Ag suggested different reaction mechanisms for gilt and non-gilt cases.     

氯化银浊度法测定铜电解液中氯离子

在丙酮存在的条件下,铜电解液中的氯离子与硝酸银反应,形成氯化银乳浊液,用铜电解液的原液(即实验中铜电解液原液没有加硝酸银的试液)作参比,于分光光度计500nm处测定其吸光度,从而得出铜电解液中氯离子的含量.     

瞿氏铁琴铜剑楼:常熟派藏书的集大成者

常熟古里瞿氏铁琴铜剑楼传承弘扬常熟派藏书传统,体现了开放、勤奋、精致、创新的人文精神。建设"书香古里"对弘扬铁琴铜剑楼藏书文化精神具有重要的示范作用,对进一步保护和利用常熟派藏书文化遗产具有时代意义。     

分布式操作系统中线程包实现方法的对比研究

内核级线程是微内核操作系统的基本调度单位,较好地支持了细粒度的并行计算,但在支持用户分布式并发模型上还有许多缺点,而用户级线程是在核心线程的支持下建立的更高层次的用户级调度单位,能较好地支持用户程序的并发执行。文章重点分析了分布式操作系统中线程包的两种实现方法,并对比研究了它们的优缺点。     

铜对玉米种子萌发和生长的影响

通过不同浓度的Cu~(2+)对玉米萌发和生长影响的研究,结果表明:当Cu~(2+)浓度为0.5～1mg/L时Cu~(2+)可以促进幼芽的生长和生物量的提高,而超过该浓度时则由促进逐渐转为抑制作用。Cu~(2+)对玉米幼苗根生长的影响大于对芽生长的影响。     

武当山元代古铜殿研究

通过对武当山小铜殿图像解读,认为小铜殿通过建筑本身对三清神符号、南斗六星、北斗九星符号的忠实表现,及其鸱尾的特别形象,充分标示出其作为玄武大帝供奉场所的道教建筑特征。     

钠与硫酸铜溶液反应的探究式教学设计与实践

开展探究式教学有利于学生科学素养的全面发展,与其他方式相比,它具有综合优势.为此,我们结合钠与硫酸铜溶液的反应,探究了钠与硫酸铜溶液反应的实质,强调了探究式教学在化学教学中的重要作用.     

Electrotypes in science and art

Abstract

The history of the production of electrotype copies is discussed in the context of the Victorian demand for reproduction of art of all kinds utilizing plaster of Paris, photographs, copies of old prints, as well as electrotypes, predominantly of copper. The philosophical reasons for the valuing or devaluing of electrotype and other copies are discussed. Electrodeposition of metals was used for an extraordinary number of different purposes in the Victorian period, and the general craze for electrotypes made their production very popular, being produced by men and women alike of many different backgrounds. By the Edwardian era, the need had subsided and an art historical reaction to the concept of copies had begun, with photography becoming more common. Examples of the use of electrotypes for photographic tinthotypes, as well as forgeries, discovered during conservation assessment at the Getty Museum on a plain Roman cased mirror which had been augmented by an electrotyped profile head addition, and samples from electropatterns from the collections of the Victoria & Albert Museum in London, are discussed in terms of the range and type of microstructural morphology displayed by electrotype copies.     

社会不公信息网络传播的社会反响特征及启示

社会不公信息会影响个体的社会认知和行为表现。网络跟帖是网民现实反应在网络状态中的一种呈现,分析网络跟帖内容,有助于探求不公信息传播的社会反响特征和信息素养培育的方法。从天涯、搜狐、腾讯三大网站,择取反映社会不公的报道的跟帖进行内容分析,可看出网民接触社会不公信息在情绪、认知特征及行为取向上的特点。应该通过学生、政府、传媒、老师合力培育学生的信息素养,减少社会不公信息传播的负面影响。