共查询到19条相似文献，搜索用时 234 毫秒
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本文以聚对二甲苯膜作为保护材料,利用真空气相沉积的方法,在CD-R光盘的表面涂膜,然后,通过老化实验在酸、碱以及紫外光等不同的环境条件下,研究了聚对二甲苯膜对CD-R光盘的保护性能。结果表明,涂膜后的CD-R光盘耐酸性大幅提升;其耐碱性虽高于未涂膜的CD-R光盘,但仍易受到碱溶液侵蚀而导致印刷层脱落;聚对二甲苯膜不能提高CD-R光盘的抗紫外光能力。 相似文献
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CD-R光盘的耐久性与光盘档案保护 总被引：3，自引：0，他引：3
目前光盘已成为文献信息存储的主要载体 ,档案部门已经开始使用光盘存储档案信息 ,然而由于光盘材料成分的复杂性 ,受外界因素的影响较大 ,近年来在光盘档案的保管和利用中出现的问题越来越多。因此 ,研究影响光盘耐久性的内因和外因 ,估计光盘的预期寿命 ,如何保存光盘档案 ,这些都是信息部门 ,特别是档案部门亟待解决的问题。本文重点以CD -R光盘为对象 ,在大量实验的基础上 ,定量分析影响CD -R光盘耐久性的内因和外因 ,提出CD -R光盘档案保护的对策和措施。一、光盘存储原理与标准光盘是一种圆盘形的多层结构。可按多种方式对光盘进… 相似文献
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光盘是继纸张、胶片和磁带介质后又一种新的存储介质。光盘具有存储容量大,存取方便,便于携带等优点,目前已被政府机关、企事业单位广泛使用,一些重要的文件已被记录到CD-R(刻录式)光盘上。如我国2008年申奥过程的所有文字和图像都已存储在CD-R光盘上,目前一些档案部门已使用CD-R光盘存储档案信息。由于在光盘上记录和读取信息都采用激光技术,激光器不与光盘产生机械接触,因此,光盘寿命一般比磁盘和磁带长,但光盘在保存环境中究竟有多长寿命,目前国内还没有准确的寿命数据。其原因主要是因为光盘这种信息存储载体出现较晚,国内的信息机构和光盘生产厂家主要研究光盘的制造工艺、存储容量、读写方式等,而对光盘记录信息后在保护环境中的影响因素很少研究。一、国内外光盘保护研究现状为了掌握国内外光盘保护研究现状,了解国内光盘生产、市场销售行情及档案部门对光盘的使用情况,有关人员进行了文献资料查询,用户和市场调研。通过网络和期刊检索,国家图书馆馆藏图书和资料查询,调研国内外信息部门和档案部门对光盘保护研究现状及相关出版物的情况。通过上网检索,检索到国内有关光盘在档案部门应用的文章100多篇,这些文章大多数是档案部门的应用情况和使用方法介绍... 相似文献
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1.档案级光盘的技术规定 档案级光盘不同于普通光盘,它是光盘存储技术在档案领域的应用,档案级光盘在选择材料加工、工艺、和出厂质量检测上都有严格的规定,从原材料的选择上保证光盘质量。因此,档案级光盘具有其特有的属性和技术指标。目前,通常作为归档的光盘是只读光盘CD、DVD和可记录光盘CD-R、DVD±R。根据中国档案行业... 相似文献
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本文阐述了一次写入式光盘的耐久性，分析了影响一次写入式光盘的耐久性的客观因素和环境因素，提出了准确使用保护光盘的具体措施。 相似文献
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《文物保护研究》2013,58(4):227-236
AbstractThis article compares chemical dechlorination treatments (immersion in sodium hydroxide or alkaline sulphite) and electrochemical treatments of iron bars from the Gallo-Roman period excavated from a marine environment. Some important parameters, such as storage before treatment, temperature, solution composition, and drying after treatment, were varied during the study to assess their influence on the chloride extraction process. The kinetics of these treatments depend mainly on chloride diffusion through the corrosion layers. The kinetics are promoted by high temperatures and, in the case of electrolysis, by the electric field effect. The reduction of corrosion products during electrolysis occurs only for objects previously stored in air. In fact, the manner in which the objects are stored before treatment is critical in the dechlorination processes. The sooner the objects are treated after excavation (with water storage), the better the removal of chloride ions, in both chemical immersion and electrolysis treatments. But if the object is stored in air, material losses occur, and only electrolysis results in complete extraction of the chlorides. These differences are due to modifications in the corrosion products during storage. Drying after treatment also has a significant impact on the composition of the corrosion layers. If the objects are dried too quickly, Fe(OH)2 oxidizes into FeOOH, which thus forms a layer with low cohesion. 相似文献
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ABSTRACTThe need to keep things cool for durability should be the single most powerful influence on storage design. The simplest temperature control is to moderate the outside temperature by a combination of thermal insulation and heat capacity. The low energy storage building is a lightweight, thermally insulated, airtight building put on top of an uninsulated floor slab laid directly on the ground. The thermal insulation is calculated to even out the daily temperature cycle but to allow an annual temperature cycle which is about half the amplitude, but much smoother, than the annual temperature cycle outside. The winter temperature inside will nearly always be above ambient and so will maintain a moderate RH without need for either humidification or dehumidification. The temperature inside in summer will be below ambient and thus will force dehumidification of the infiltrating air. However, the airtightness of the building allows intermittent dehumidification with low energy consumption, less than one kWh/m3 per year. There now exist enough buildings designed on this principle to reassure curators that highly valued collections can be stored in a space with a gentle temperature cycle and with an RH stability as good as air-conditioning usually achieves. 相似文献
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无碳复写纸档案字迹材料耐久性与环境温湿度、酸碱性物质、有机溶剂、微胶囊牢度、显色剂性能等保存环境和内在因素密切相关。本文就影响无碳复写纸档案字迹材料耐久性的温湿度、酸碱、有机溶剂、微胶囊牢度、显色剂性能等因素进行研究和分析。 相似文献
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The work reported here is a systematic study to evaluate the compatibility of using PS-F (potassium silicate with high modulus – fly ash) slurry in the conservation of adobe structures. Firstly, the optimum mixing proportion (0.47) was determined by flow meter. Then the experimental program was divided into two parts: one part studied changes in physical and mechanical properties with increase in setting time by means of the measurement of moisture content, compressive and flexural strength, elastic-wave velocity, density, and porosity; the other part studied the durability of PS-F slurry through temperature and humidity cycles, freeze–thaw cycles, water stability, tensile testing, and alkali resistivity tests. The results show that the consolidation process with the slurry can meet the requirements of conservation applications and provide a timely anchoring force, and the slurry and soil mass of adobe-based structures have good compatibility in physical and mechanical properties. In addition, the slurry can strongly resist freeze–thaw cycles, temperature-moisture cycles, and tensile stress and has a relatively weak resistance to alkali solutions and water immersion. In conclusion, PS-F with a mixing ratio of 0.47 is a suitable slurry for conservation of adobe structures. 相似文献
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Gabriel Pablo Axarlian 《Journal of Media Economics》2017,30(3):121-142
Home entertainment markets have seen dramatic declines in revenues over the last 10 years due to the digital revolution, making new adaptation strategies of crucial importance to maintaining existing profitability. Recently, the film industry has worked with related firms to develop a standardized ecosystem for the sale and access to digital versions of their films. This system, known as UltraViolet, embodies infinite durability; the perpetual access to a purchased film across computing platforms and time. The author makes use of exogenous variation in the implementation of this system to study the effect the introduction of this new feature has had on the decision to buy or rent. His findings show that the inclusion of infinite durability creates enough value to spur increased purchasing behavior. Also, the inclusion of infinite durability creates a high degree of substitutability amongst products that include it in purchase markets. Lastly, the author found evidence that the lack of inclusion of infinite durability will spur consumers to rent rather than buy. 相似文献
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论电子文件信息流程及其凭证价值 总被引：2，自引：0，他引：2
电子文件信息流程划分为电子信息层、现行电子文件信息层、电子档案信息层三个层级,这三个层级分别具有着不同的特点和凭证价值.电子信息层的信息零散且难以查考,只有部分信息具有凭证性,不具有凭证价值;现行电子文件信息层的信息是真实记录,具有凭证价值,但其凭证价值易受到外界影响;电子档案信息层储存的是经档案化归档后的信息,其凭证... 相似文献
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The aim of this paper is to study the influence of atmospheric humidity and temperature on the mural paintings in the Mogao Grottoes of Dunhuang by measuring the weight of a simulated mural block. Under open conditions, the daily changes in the atmospheric humidity and temperature have an apparent effect on the water content of these murals. There exists an obvious water exchange between atmosphere and mural, that is, there is a ±43?g?m?2 moisture absorption–desorption ‘breathing’ process between the two. Evapotranspiration from the tree-belt, precipitation, and extremely dry weather also have an effect on the moisture associated with a mural painting. If the cave is closed, a comparable study finds that closure can make the effects of temperature and humidity changes disappear. The mural water content in this case remains stable and the harm due to water-salt deterioration is greatly reduced. Under closed conditions, artificial condensation dehumidification and control of the cave's temperature and humidity stabilizes water activity in the mural paintings very effectively. This is a clear indication of the future steps required to protect the cave's cultural relics. 相似文献