THE ACETONE/ROSIN METHOD FOR CONSERVATION OF WATERLOGGED WOOD

Abstract

The problem of conservation of sound waterlogged oak and in particular the limitations of polyethylene glycol impregnation are briefly considered. Development of a new process involving dehydration with acetone and impregnation with rosin is described. Results pertaining to the experimental evaluation of the procedure are presented and suggest good success in its use. Applications of the process in the conservation of soft- and heavily waterlogged woods are described.     

THE POTENTIAL OF THE CANADIAN WINTER CLIMATE FOR THE FREEZE-DRYING OF DEGRADED WATERLOGGED WOOD

Abstract

The winter climatic conditions of much of Canada provide an ideal environment for freeze-drying. We have been attempting to use these conditions for the drying of large waterlogged timbers. In the freeze-drying process the wood is kept in a frozen state and the drying proceeds by sublimation. We are particularly concerned with the treatment of large timber which present great difficulties when treated by the accepted methods. A structure was built to keep snow and rain off the wood but which allowed air to pass over it. The structure was covered with polyethylene sheet to allow the sun to shine on the wood surface and heat it. Weight changes in the wood were measured with a load transducer and temperature wa followed with thermocouple probes. Temperature and relative humidity of the surrounding air were recorded instrumentally. The timbers were of several varieties of wood in various states of decomposition. All of the wood dried quickly and much of the water was removed. This technique appears to have the potential to treat large quantities of timber in an economic and simple way.     

论保存元数据

对数字资源保存的日益重视导致了资源保存系统的出现,保存元数据是资源保存系统功能实现的关键。文章分析了保存元数据的定义、类型,并比较了几种著名的保存元数据的特点。     

PROPERTIES AND PRESERVATION OF ETHNOGRAPHICAL SEMI-TANNED LEATHER

Abstract

In contrast to fully tanned leather, that used by the Canadian Indians and Eskimos has poor durability. When stored under less than ideal conditions it becomes stiff and brittle, and restoration of such artifacts presents problems. The methods used for sound leather, such as fat liquoring or staking, cannot be used once the skin has deteriorated. A method used successfully is described. It consists of soaking the artifact in water to gain pliability and then replacing the water with organic liquid in order to avoid shrinkage on drying. Flexibility is preserved by permeation with an emulsion containing a stabilized olein soap, neat’s-foot oil and ethyl alcohol. Gut-skin may be treated by a modification of this emulsion. Fur poses a lesser problem because the skin is thin and can easily be permeated with an aqueous emulsion of sulfited sperm oil. Several examples of restoration are given.     

THE PRESERVATION AND RESTORATION OF CANADIAN ETHNOGRAPHIC BASKETRY

Abstract

A method is given for the restoration and preservation of basketry. The treatment utilizes polyethylene glycol 600 with glycerine, dissolved in a 75% aqueous ethyl alcohol solution. No objectionable changes in the appearance have been observed.     

关于优秀学士论文收藏问题的调查

通过对问卷调查的统计、归纳,认为优秀学士论文(书本式)深得读者欢迎,收藏意义很大。     

清华大学图书馆保存元数据方案

介绍了清华大学图书馆为实现数字资源长期保存而提出的一个解决方案,内容包括元数据框架、标引机制和元数据编码方法。此方案不仅可以保证资源的长期保存,而且可以很好地表达文献的结构。     

欧洲数字信息长期保存研究及其启示

介绍了几个欧洲数字信息长期保存合作项目(DELOS、NETLIB、ERPANET、PRESTO、SEPIA、MMP和EVA等),并给出了对我国的数字信息长期保存研究现状的初步文献调查结果。     

CSDL外购数字文献资源的长期保存策略

提出了国家科学数字图书馆(CSDL)对外购商业化数字文献资源进行长期保存的分析框架,并在此基础上提出了策略建议,包括长期保存内容、保存程度、保存方式、权益要求、技术策略要求和管理机制要求。     

中文Web资源保存现状与思考

近年来,中文Web资源迅速增长,它们是中华文化遗产的一部分,理应得到保存。该文评述Web资源及其保存现状,揭示中文Web资源保存面临的几个主要问题:中文Web空间的划定问题、著作权问题、资金问题、组织与管理机制、中文Web档案馆建设等,并提出笔者的一些意见与思考。     

用于输送siRNA的聚乙烯亚胺-聚乙二醇二丙烯酸酯纳米凝胶

阐述了一种新的用于输送小干扰核糖核酸(siRNA)的聚乙烯亚胺-聚乙二醇二丙烯酸酯纳米凝胶的合成及其表征.在反相微乳液体系中,聚乙烯亚胺(PEI)和聚乙二醇二丙烯酸酯(PEG-DA)通过麦克尔加成交联得到纳米凝胶.1H-NMR和FTIR的结果充分证明纳米凝胶的化学结构,而动态光散射则表明纳米凝胶的颗粒粒径均匀,约为180 nm,zeta电位为37.9 mV.同时,MTT结果表明纳米凝胶在高达1 mg/mL的浓度下对MCF-7细胞也基本没有毒性.凝胶阻滞实验证明纳米凝胶在体外可以通过静电相互作用稳定结合siRNA.转染实验结果表明纳米凝胶与GFP siRNA的复合物能降低MCF-7 KMRV细胞(一种能稳定表达GFP蛋白的MCF-7细胞系)GFP蛋白的表达.以上结果证明这种生物相容性的纳米凝胶可以结合并输送siRNA进入细胞,沉默相关基因的表达.     

数字文献信息的保存-未来图书馆事业发展的前提和条件

尽管我们在数字文献资料的生产、收集和存储方面的能力迅速增长,但由于法律和技术等方面的原因,数字文献的长期保存问题远远没有解决,这给负责收藏数字文献的图书情报机构留下深深的隐患。文章介绍了数字保存的现状和存在的问题,论述了数字文献保存的特殊性,提出了数字保存基础设施的建设,可为图书馆事业的发展奠定良好的基础。     

ON THE CHOICE OF PAPER FOR LINING WORKS OF ART ON GROUND WOOD PULP SUPPORTS

Abstract

Measurements on the rectangular oak supports to three portraits, which include those of Henry VII and of Henry VIII, indicate they were made from the same tree and enable the approximate date at which the panels were used to be determined by dendrochronology. There is the likelihood that a fourth member of the group, previously believed to be Arthur, Prince of Wales, is a copy of an early portrait of Henry VIII.     

沙文汉第一次来我家以后

一 我第一次见到沙文汉是1949年.那年4月上旬,中共中央上海局策反工作委员会主任委员张执一,第一次偕同上海局领导人之一的沙文汉(1908—1964,当时化名张登)来到我家(策委会机关).他说他和李正文(三位策反委员之一)要离开上海到香港去,今后策反工作由沙文汉领导. 沙文汉身材高,人稍瘦,说话有浓重的宁波口音,平易近人,第一次见面就给我留下深刻的好印象. 沙文汉看了我家的两室和一个带阳台间的房间,又到南北窗门观看周围环境,说这里是闹中取静,很好.