title: Customizing digital library interfaces with Greenstone

authors: Witten, Ian H.

subjects: computer science

abstract: Digital libraries are organized, focused collections of information. They are focused on a particular topic or theme—and good digital libraries will articulate the principles governing what is included. They are organized to make information accessible in particular, well-defined, ways—and good ones will include a description of how the information is organized (Lesk, 1997).
The Greenstone digital library software is intended to help users construct simple collections of information very quickly. Indeed, only a few minutes of the user's time are needed to set up a collection based on a standard design and initiate the building process. Collections may be large—some comprise Gbytes of text; millions of documents. Furthermore, even larger volumes of information may be associated with a collection—typically audio, image, and video, with textual metadata. Once initiated, the mechanical process of building the collection may take from a few moments for a tiny collection to several hours for a multi-Gbyte one—perhaps even a day if it involves many different full-text indexes.

text: Customizing digital library interfaces with Greenstone Digital libraries are organized, focused collections of information. They are focused on a particular topic or theme—and good digital libraries will articulate the principles governing what is included. They are organized to make information accessible in particular, well-defined, ways—and good ones will include a description of how the information is organized (Lesk, 1997).
The Greenstone digital library software is intended to help users construct simple collections of information very quickly. Indeed, only a few minutes of the user's time are needed to set up a collection based on a standard design and initiate the building process. Collections may be large—some comprise Gbytes of text; millions of documents. Furthermore, even larger volumes of information may be associated with a collection—typically audio, image, and video, with textual metadata. Once initiated, the mechanical process of building the collection may take from a few moments for a tiny collection to several hours for a multi-Gbyte one—perhaps even a day if it involves many different full-text indexes.

year: 2003

title: Comparison of dynamic properties of magnetorheological elastomers with existing antivibration rubbers

authors: Shuib, Raa Khimi

subjects: Science & Technology

abstract: Tan δ and energy dissipated during hysteresis testing of isotropic and anisotropic MREs containing silane modified iron sand particles in a natural rubber matrix were compared with existing antivibration rubbers. Tan δ was measured using dynamic mechanical analysis (DMA) over a range of frequency (0.01–130 Hz), strain amplitude (0.1–4.5%), and temperature (−100–50 °C). Energy dissipated was measured using a universal tester under cyclic tensile loading. The chosen antivibration rubbers for comparison contained different contents of carbon black filler (30, 50 and 70 phr) in a natural rubber matrix. It was found that energy absorption for comparative samples was generally higher than isotropic and anisotropic MREs over the range of frequency and strain amplitude explored, as well as in hysteresis testing and this was believed to be largely due the presence of carbon black in the formulation. Further assessment was carried out on materials that were the same as anisotropic MREs except they had additions of carbon black. The energy absorption was found higher than comparative samples with the same carbon black contents, supporting the use of iron sand to improve damping. However, trends for energy absorption at around Tg were found to reverse which is considered to be due to the segmental motion of rubber chains being by far the most significant influence on energy absorption in the glass transition zone.

text: Comparison of dynamic properties of magnetorheological elastomers with existing antivibration rubbers Tan δ and energy dissipated during hysteresis testing of isotropic and anisotropic MREs containing silane modified iron sand particles in a natural rubber matrix were compared with existing antivibration rubbers. Tan δ was measured using dynamic mechanical analysis (DMA) over a range of frequency (0.01–130 Hz), strain amplitude (0.1–4.5%), and temperature (−100–50 °C). Energy dissipated was measured using a universal tester under cyclic tensile loading. The chosen antivibration rubbers for comparison contained different contents of carbon black filler (30, 50 and 70 phr) in a natural rubber matrix. It was found that energy absorption for comparative samples was generally higher than isotropic and anisotropic MREs over the range of frequency and strain amplitude explored, as well as in hysteresis testing and this was believed to be largely due the presence of carbon black in the formulation. Further assessment was carried out on materials that were the same as anisotropic MREs except they had additions of carbon black. The energy absorption was found higher than comparative samples with the same carbon black contents, supporting the use of iron sand to improve damping. However, trends for energy absorption at around Tg were found to reverse which is considered to be due to the segmental motion of rubber chains being by far the most significant influence on energy absorption in the glass transition zone.

year: 2015-12-15

title: An Interactive User Management System for Multilingual Documents: A case study of the Pei Jones collection

authors: Cader, Papitha

subjects: Greenstone Digital Library

abstract: Can general purpose DL software architecture be designed to provide a flexible environment that supports both the management and end-user roles through a single unified web interface? In particular we take the collected correspondence of the Māori scholar Dr. Pei Jones and undertake case study of how this approach can be applied in a practical way.

text: An Interactive User Management System for Multilingual Documents: A case study of the Pei Jones collection Can general purpose DL software architecture be designed to provide a flexible environment that supports both the management and end-user roles through a single unified web interface? In particular we take the collected correspondence of the Māori scholar Dr. Pei Jones and undertake case study of how this approach can be applied in a practical way.

year: 2012