一种光盘数据库数据的物理组织技术

在分析光盘数据库特点、难点基础之上, 结合我们系统开发的光盘产品, 提出了一种非结构化的光盘数据库的物理组织技术。该技术已成功应用在几个数据库上, 实践证明该技术是可行的和有效的。     

Storage and retrieval considerations of binary data bases

A binary approach to data storage and retrieval is introduced. It views the data base as a two-dimensional matrix that relates entities to all possible values the attributes of these entities may take. As such, it provides a unified solution to the two conflicting types of data base transactions—operational and managerial. An analytical investigation of the feasibility of binary storage and a compression method for reducing meaningless areas of the matrix are presented. Storage efficiencies of binary and conventional inverted file methods are compared and evaluated. An analysis of retrieval considerations associated with the binary matrix is given, particularly the issue of going from high to low orders of compression. Results of these analyses indicate that the binary data base's efficiency increases with increases in query complexity. Future research directions are sited and discussed.     

虚拟存储技术及其在数字图书馆中的应用

数字图书馆的发展使馆藏数字化资源急剧增长，图书馆对存储的需求激增。文章在介绍虚拟存储技术原理、优势、实现方法的基础上，阐述了虚拟存储技术在数字图书馆建设中的应用。     

知识构建对知识管理的优化及实证研究

本文在对知识构建与知识管理的关系进行分析的基础上,提出了知识构建对知识管理体系中的知识获取、知识表示、知识存储和知识共享优化的思路,并结合Kretrieval模型系统进行了实证分析。本文的研究对促进知识管理在组织内部更好地产生应有的作用,并最终推动知识构建深层次的研究与应用具有一定意义。     

Records storage in the cloud: are we modelling the cost?

Cloud services are increasingly seen as a flexible strategy for platform, infrastructure and software. Given the cloud’s claimed economic benefits archives and records professionals are now using cloud services for the storage of digital records and data. However, in determining whether or not to use the cloud for records and/or data storage, what models are available to them for estimating the cost and the medium-to-long-term financial implications for their organisations? This article identifies models available for estimating cloud storage costs and presents the results of an international survey into their use in the decision-making process with a series of real use case examples illustrating their value. The study highlights a series of important implications for archivists and records managers. These include the importance and challenges of using the models, their lack of widespread use, their adequacy, and the multiple players who should be involved in their application and development. Archivists and records managers need greater awareness and understanding of the models so they can play a central role in the cloud storage decision-making process and in the development of more effective costing models.     

DNA storage: research landscape and future prospects

The global demand for data storage is currently outpacing the world''s storage capabilities. DNA, the carrier of natural genetic information, offers a stable, resource- and energy-efficient and sustainable data storage solution. In this review, we summarize the fundamental theory, research history, and technical challenges of DNA storage. From a quantitative perspective, we evaluate the prospect of DNA, and organic polymers in general, as a novel class of data storage medium.     

Unprecedented and highly stable lithium storage capacity of (001) faceted nanosheet-constructed hierarchically porous TiO2/rGO hybrid architecture for high-performance Li-ion batteries

Active crystal facets can generate special properties for various applications. Herein, we report a (001) faceted nanosheet-constructed hierarchically porous TiO₂/rGO hybrid architecture with unprecedented and highly stable lithium storage performance. Density functional theory calculations show that the (001) faceted TiO₂ nanosheets enable enhanced reaction kinetics by reinforcing their contact with the electrolyte and shortening the path length of Li⁺ diffusion and insertion-extraction. The reduced graphene oxide (rGO) nanosheets in this TiO₂/rGO hybrid largely improve charge transport, while the porous hierarchy at different length scales favors continuous electrolyte permeation and accommodates volume change. This hierarchically porous TiO₂/rGO hybrid anode material demonstrates an excellent reversible capacity of 250 mAh g^–1 at 1 C (1 C = 335 mA g^–1) at a voltage window of 1.0–3.0 V. Even after 1000 cycles at 5 C and 500 cycles at 10 C, the anode retains exceptional and stable capacities of 176 and 160 mAh g^–1, respectively. Moreover, the formed Li₂Ti₂O₄ nanodots facilitate reversed Li⁺ insertion-extraction during the cycling process. The above results indicate the best performance of TiO₂-based materials as anodes for lithium-ion batteries reported in the literature.     

Hierarchically structured porous materials: synthesis strategies and applications in energy storage

To address the growing energy demands of sustainable development, it is crucial to develop new materials that can improve the efficiency of energy storage systems. Hierarchically structured porous materials have shown their great potential for energy storage applications owing to their large accessible space, high surface area, low density, excellent accommodation capability with volume and thermal variation, variable chemical compositions and well controlled and interconnected hierarchical porosity at different length scales. Porous hierarchy benefits electron and ion transport, and mass diffusion and exchange. The electrochemical behavior of hierarchically structured porous materials varies with different pore parameters. Understanding their relationship can lead to the defined and accurate design of highly efficient hierarchically structured porous materials to enhance further their energy storage performance. In this review, we take the characteristic parameters of the hierarchical pores as the survey object to summarize the recent progress on hierarchically structured porous materials for energy storage. This is the first of this kind exclusively to survey the performance of hierarchically structured porous materials from different porous characteristics. For those who are not familiar with hierarchically structured porous materials, a series of very significant synthesis strategies of hierarchically structured porous materials are firstly and briefly reviewed. This will be beneficial for those who want to quickly obtain useful reference information about the synthesis strategies of new hierarchically structured porous materials to improve their performance in energy storage. The effect of different organizational, structural and geometric parameters of porous hierarchy on their electrochemical behavior is then deeply discussed. We outline the existing problems and development challenges of hierarchically structured porous materials that need to be addressed in renewable energy applications. We hope that this review can stimulate strong intuition into the design and application of new hierarchically structured porous materials in energy storage and other fields.     

科研人员学术信息资源云存储服务应用安全障碍分析与对策

[目的/意义]提出基于用户认知的云存储服务优化对策,为解决学术信息资源云存储安全障碍提供指导。[方法/过程]通过问卷调查389名科研人员云存储服务使用及云存储服务安全认知情况,分析科研人员云存储应用安全障碍。[结果/结论]文件损坏问题、文件同步更新问题、学术信息资源内容合规性误判问题以及隐私泄露担忧是制约科研人员深度使用云存储服务的主要安全障碍。同时从攻克技术难题、完善管理策略、推进监管实施等方面提出针对性解决安全障碍的建议和措施。