title: Alerting in a Digital Library environment - Do Channels meet the requirements?

authors: Faensen, Daniel

subjects: computer science

abstract: An Alerting Service (AS) informs its clients about new information provided by several suppliers. Special interests of clients can be defined as profiles. In the context of digital libraries, suppliers are the providers of documents. Providers are typically scientific publishers. In this paper we assume, that the providers are known to the clients. A general model and architecture of an Alerting Service is given in [1]. Channel technology has been developed for broadcast of news and continous streams of data like stock rates. For the digital library enviroment a finer granularity in profile definition than for common broadcasting is needed. In contrast to broadcast services, publishing events of multiple providers have to be presented to each client in a uniform way. 
In this summary we evaluate how the two competing approaches of Channel technology, Netscape’s Netcaster [3] and Microsofts Active Channels [2] meet these requirements. 
To satisfy user’s needs events have to be filtered by more or less complex profiles, e. g. a set of documents (like journals), a list of keywords (selected arbitraryly or from a thesaurus) or a query in a full-fledged query language like STARTS [4]. An easy-to-use and powerful profile definition language is one requirement for an AS. The second is a unified view, that means splitting the n:m-relationship between providers and clients. 
The use of both technologies strongly depends on how the contents is to be filtered, i.e. how the user profile is to be defined.

text: Alerting in a Digital Library environment - Do Channels meet the requirements? An Alerting Service (AS) informs its clients about new information provided by several suppliers. Special interests of clients can be defined as profiles. In the context of digital libraries, suppliers are the providers of documents. Providers are typically scientific publishers. In this paper we assume, that the providers are known to the clients. A general model and architecture of an Alerting Service is given in [1]. Channel technology has been developed for broadcast of news and continous streams of data like stock rates. For the digital library enviroment a finer granularity in profile definition than for common broadcasting is needed. In contrast to broadcast services, publishing events of multiple providers have to be presented to each client in a uniform way. 
In this summary we evaluate how the two competing approaches of Channel technology, Netscape’s Netcaster [3] and Microsofts Active Channels [2] meet these requirements. 
To satisfy user’s needs events have to be filtered by more or less complex profiles, e. g. a set of documents (like journals), a list of keywords (selected arbitraryly or from a thesaurus) or a query in a full-fledged query language like STARTS [4]. An easy-to-use and powerful profile definition language is one requirement for an AS. The second is a unified view, that means splitting the n:m-relationship between providers and clients. 
The use of both technologies strongly depends on how the contents is to be filtered, i.e. how the user profile is to be defined.

year: 1998

title: Metal complexes of sporidesmin D and dimethylgliotoxin, investigated by electrospray ionisation mass spectrometry

authors: Woodcock, Jane C.

subjects: Electrospray mass spectrometry

abstract: Electrospray ionisation mass spectrometry (ES-MS) has been used to probe the coordination chemistry of metabolites such as sporidesmin D (spdD), found in the saprophytic fungus Pithomyces chartarum, and the related bisdethiobis(methylthio)gliotoxin (dimethylgliotoxin, Megtx). SpdD forms complexes of the type [spdD+M(MeCN)]+ and [2spdD+M]+ (M=Cu, Ag) and, at higher cone voltages, [spdD+M]+. The bis(ligand) ion [2spdD+M]+ was observed at very high cone voltages, indicating it has appreciable stability; the proposed structure of this species has a four-coordinate metal ion with two bidentate spdD ligands, coordinated through their SMe groups. 1H NMR titrations of spdD with K+, Ag+ and Cu+ provided additional evidence for complex formation with the soft metals. SpdD forms only relatively weak complexes with Zn2+, Cd2+, Co2+ and Mn2+, in keeping with the known reduced tendency of these metals to form stable thioether complexes. ES-MS studies of Megtx showed similar results to spdD, with stable adducts formed with Cu+ and Ag+ ions. The X-ray crystal structure of spdD is also reported.

text: Metal complexes of sporidesmin D and dimethylgliotoxin, investigated by electrospray ionisation mass spectrometry Electrospray ionisation mass spectrometry (ES-MS) has been used to probe the coordination chemistry of metabolites such as sporidesmin D (spdD), found in the saprophytic fungus Pithomyces chartarum, and the related bisdethiobis(methylthio)gliotoxin (dimethylgliotoxin, Megtx). SpdD forms complexes of the type [spdD+M(MeCN)]+ and [2spdD+M]+ (M=Cu, Ag) and, at higher cone voltages, [spdD+M]+. The bis(ligand) ion [2spdD+M]+ was observed at very high cone voltages, indicating it has appreciable stability; the proposed structure of this species has a four-coordinate metal ion with two bidentate spdD ligands, coordinated through their SMe groups. 1H NMR titrations of spdD with K+, Ag+ and Cu+ provided additional evidence for complex formation with the soft metals. SpdD forms only relatively weak complexes with Zn2+, Cd2+, Co2+ and Mn2+, in keeping with the known reduced tendency of these metals to form stable thioether complexes. ES-MS studies of Megtx showed similar results to spdD, with stable adducts formed with Cu+ and Ag+ ions. The X-ray crystal structure of spdD is also reported.

year: 2001-04-01

title: Maori preservice primary teachers’ responses to mathematics investigations

authors: Hāwera, Ngārewa

subjects: mathematics

abstract: There has been concern for some years about the low mathematics achievement of Maori students in New Zealand. This case study reports on the responses of 18 Maori preservice teachers to investigative approaches to learning mathematics during their compulsory Year 1 mathematics education course, as a possible aid towards helping improve the achievement level of Maori in mathematics.

text: Maori preservice primary teachers’ responses to mathematics investigations There has been concern for some years about the low mathematics achievement of Maori students in New Zealand. This case study reports on the responses of 18 Maori preservice teachers to investigative approaches to learning mathematics during their compulsory Year 1 mathematics education course, as a possible aid towards helping improve the achievement level of Maori in mathematics.

year: 2006