Content creation for a language learning system is a time-consuming, laborious, and expensive task. It is therefore desirable to reuse content as much as possible in different learning situation. An important part of content is the illustrative content, i.e. example sentences. Such examples show a typical context in which a given rule can be used. We discuss a solution to reuse illustrative con...

Original scientific papers Performance of ultrasonic pulse velocity (UPV) in hydraulically bound mixtures is examined as a non-destructive testing, in order to estimate its potential for pavement material characterization. Test results show that an increase in cement content results in an increase in UPV values. Increase in steel slag aggregate content results in a decrease in UPV values. Analy...

The aim of this study was to optimize the extraction of p-menthadienol isomers and aristolone from the essential oil of Elyonurus hensii by hydrodistillation. The study of the seasonal variation in the chemical composition has shown that the plant material has been subject to a natural selection regarding the biosynthesis of the p-menthadienol isomers: during periods of water stress, the extrac...

  Abstract The present study aims to evaluate EFL course contents used in language schools and institutes in Teh-ran. To that end, 230 participants in Tehran were conveniently sampled. At the outset of the study, two questionnaires were given to all groups, and according to their responses, the data were analyzed. Each of the questionnaires was given to participants individually. Each group ...

in order to study the reaction of barley genotypes to drought, an experiment was conducted in a factorialdesign based on crd for two wild ecotypes and four crop genotypes of barley in greenhouse. in thisstudy, the barley genotypes and wild ecotypes as the first factor and irrigation treatment with three levelsinclude 70 percent of water holding capacity of soil, 30 and 10 percent as the second ...

6-prenylnaringenin (6pn) is a chiral prenylflavonoid found most prevalently in hops ( humulus lupulus ) and present in hops and hop products. it is an isomer of the potent phytoestrogen, 8-prenylnaringenin. an enantiospecific method for quantitation 6pn by lc-esi-ms has been developed. baseline enantiomeric resolution of 6pn was attained on a chiralpak ® ad-rh column with an isocratic mobile ph...

Teacher and students can use WWW as a limitless source of learning material for nearly any subject. Yet, such abundance of content comes with the problem of finding the right piece at the right time. Conventional adaptive educational systems cannot support personalized access to open-corpus learning material as they rely on manually constructed content models. This paper presents an approach to...

As digital content in the form of learning objects allows the assembling of learning material on the fly, developers and users strive to aggregate learning objects from different origins to coherent learning units in a consistent way, including graphical and navigational design. Such content elements that rely in distributed repositories require metadata for advanced search functionality to ide...

eCMS is a web-based federated content management system for the support of distributed teaching based on an open, distributed middleware architecture for the publication, discovery, retrieval, and integration of educational material. The infrastructure supports the management of both standalone material and structured courses, as well as the integration of existing organized external repositori...