Dublin City University

About: Dublin City University is a education organization based out in Dublin, Ireland. It is known for research contribution in the topics: Context (language use) & Machine translation. The organization has 5904 authors who have published 17178 publications receiving 389376 citations. The organization is also known as: National Institute for Higher Education, Dublin & DCU.

Chitosan sorbents for platinum sorption from dilute solutions

Abstract: Chitosan has proved efficient at removing platinum in dilute effluents. The maximum uptake capacity reaches 300 mg/g (almost 1.5 mmol/g). The optimum pH for sorption is pH 2. A glutaraldehyde cross-linking pretreatment is necessary to stabilize the biopolymer in acidic solutions. Sorption isotherms have been studied as a function of pH, sorbent particle size, and the cross-linking ratio. Surprisingly, the extent of the cross-linking (determined by the concentration of the cross-linking agent in the treatment bath) has no significant influence on uptake capacity. Competitor anions such as chloride or nitrate induce a large decrease in the sorption efficiency. Sorption kinetics show also that uptake rate is not significantly changed by increasing either the cross-linking ratio or the particle size of the sorbent. Mass transfer rates are significantly affected by the initial platinum concentration and by the conditioning of the biopolymer. Gel-bead conditioning appears to reduce the sorption rate. While for molybdate and vanadate ions, mass transfer was governed by intraparticle mass transfer, for platinum, both external and intraparticle diffusion control the uptake rate. In contrast with the former ions, platinum does not form polynuclear hydrolyzed species, which are responsible for steric hindrance of diffusion into the polymer network.

High performance mode locking characteristics of single section quantum dash lasers.

Abstract: Mode locking features of single section quantum dash based lasers are investigated. Particular interest is given to the static spectral phase profile determining the shape of the mode locked pulses. The phase profile dependence on cavity length and injection current is experimentally evaluated, demonstrating the possibility of efficiently using the wide spectral bandwidth exhibited by these quantum dash structures for the generation of high peak power sub-picosecond pulses with low radio frequency linewidths.

Irish secondary students' perceptions of the work of an accountant and the accounting profession

Abstract: Research shows that the perceptions that people hold are an important influence on career decisions. This study examines Irish secondary school students' perceptions of the work of an accountant and the accounting profession. Students are found to hold a traditional view of the profession considering it to be boring, definite, precise and compliance driven. Students who are studying accounting in school have less negative views than those not studying the subject. Females view accounting as more definite, precise and compliance driven than males. Students' perceptions are influenced by the study of the subject at school, the factual media and teachers. They believe that society holds the profession in high esteem but lower than some other professions. These findings suggest that if the profession is to be successful in attracting students who have the skills and attributes to become effective accountants, it must seek to influence students' perceptions of accounting by providing them with a reali...