As mobile computing applications have become commonplace, it is increasingly important for them to address end-users’ privacy requirements. Mobile privacy requirements depend on a number of contextual socio-cultural factors to which mobility adds another level of contextual variation. However, traditional requirements elicitation methods do not sufficiently account for contextual factors and th...

To be regarded as environmentally friendly and economical, an industrial process using 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) oxidation requires recycling and/or recovery of chemicals. In this work, hypochlorite recycling via electrolysis was evaluated and potential means for TEMPO recovery were explored. The most important variable affecting electrochemical hypochlorite conversion was th...

Supercritical fluid extraction (SFE) is an innovative, clean and environmental friendly technology with particular interest for the extraction of essential oil from plants and herbs. Supercritical CO(2) is selective, there is no associated waste treatment of a toxic solvent, and extraction times are moderate. Further, supercritical extracts were often recognized of superior quality when compare...

The increasing demand of the low boiling aromatics for chemicals has provided the primary incentive for the tremendous expenditure by the petroleum industry to improve processing methods. Also, refineries are becoming more aware of applying conventional oil refinery processing methods to the production of petrochemicals. Considerable experience has been gained in the operation of certain types ...

Objective: To determine the extraction technique and content of linalool, as dominant compound, in black betel essential oil from East Kalimantan using a validated analytical method.
 Methods: Extraction was carried out steam distillation. Essential oils were assessed by observing colour solubility ethanol. Using an Agilent GC-MS with 5977B (GCMSD) detector, DB-5MS column, helium gas carri...