Personal Research Database

Title: Telma (Hannover)

Title: Tenside Surfactants Detergents

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: Impact Factor

? Selim, K.A., El-Rahiem, F.H.A. and El-Midany, A.A. (2009), Kinetic modelling and equilibrium of amphoteric collector adsorption on silica and hematite. Tenside Surfactants Detergents, 46 (2), 85-91.

Full Text: Ten Sur Det46, 85.pdf

Abstract: Most of the world iron ores are associated with siliceous impurities. Upgrading schemes depend mostly on the removal of these impurities by flotation and/or selective flocculation techniques, which mainly influenced by the adsorption of collectors on both valuable and gangue minerals. In this study, the adsorption of amphoteric collector (dodecyl-N-carboxyethyl-N-hydroxyethyl-imidazoline) on silica and hematite was studied. The collector adsorption exhibits the preferential adsorption on silica at acidic pH range. While in case of hematite, the adsorption was the same over entire the studied pH range. The temperature was kept constant at 298 K and contact time of 60 min was found, from kinetic study, to be adequate to achieve equilibrium. In addition, two simplified kinetic models including a pseudo first-order equation and pseudo second-order equation were used to determine kinetic parameters, rate constants, and equilibrium sorption capacities. It was shown that the pseudo first-order equation perfectly describes the adsorption of collector. Moreover, the analysis of experimental isotherm data using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich equations showed that the Freundlich model reasonably fits the experimental data in the studied concentration range.

Keywords: Activated Carbon, Adsorption, Adsorption Isotherms, Adsorption Kinetics, Amphoteric Collector, Aqueous-Solution, Equilibrium, Hematite, Kinetic, Phosphate Adsorption, Removal, Silica, Sorption

? Ishaq, M., Saeed, K., Ahmad, I., Shakirullah, M. and Nadeem, S. (2010), Removal of Tartrazine from aqueous solution by activated coal. Tenside Surfactants Detergents, 47 (1), 13-17.

Full Text: Ten Sur Det47, 13.pdf

Abstract: Removal of industrially important Tartrazine dye from aqueous solution was carried with virgin and variously activated coal samples at room temperature. The morphological study indicated that the number of coal particles was increased when the coal was evacuated at 200ºC while aggregated form was observed at 400ºC evacuation temperature. The coal particles were again formed at 600ºC evacuation temperature. The coal, which was evacuated at 400ºC, adsorbed less Tartrazine than the coal samples which were evacuated at 200 and 600ºC. This might be caused by the aggregation of the coal particles at 400ºC (because of the plastic range of coal swelling), which results in a decrease of the coal surface area. The obtained adsorption data were also fitted to Langmuir and Freundlich isotherms, which followed both Langmuir and Freundlich isotherms models.

Keywords: Adsorbents, Adsorption, Adsorption-Isotherms, Aggregation, Aqueous Solution, Bagasse-Fly-Ash, Basic-Dyes, Coal, Data, Dye, Effluent, Equilibrium, Freundlich, Hazardous Dye, Isotherms, Kinetics, Langmuir, Langmuir and Freundlich Isotherms, Models, Morphology, Particles, Range, Removal, Room Temperature, Scanning Electron Microscopy, Silica, Solution, Sorption, Surface, Surface Area, Swelling, Tartrazine, Temperature

Title: Telemedicine Journal and E-Health

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ISSN: 1530-5627

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? Williams, T.L., May, C.R. and Esmail, A. (2001), Limitations of patient satisfaction studies in telehealthcare: A systematic review of the literature. Telemedicine Journal and E-Health, 7 (4), 293-316.

Full Text: 2001\Tel J E-Hea7, 293.pdf

Abstract: The objective of this study is to provide a systematic review of studies on patient satisfaction with telemedicine. The review included empirical studies that investigated patient satisfaction with that telemedicine service. The search strategy involved matching at least one of 11 ‘telemedicine’ terms with one of 5 ‘satisfaction’ terms. The following databases were searched: Telemedicine Information Exchange (TIE) database, MEDLINE, Science Citation Index (SCI), Social Science Citation Index (SSCI), Psycinfo, and Citation Index of Nursing and Allied Health (CINAHL). A highly structured instrument was used for data extraction. The review included 93 studies. Telepsychiatry represents the largest portion of these studies (25%), followed by multispecialty care (14%), nursing (11%), and dermatology (8%). Real-time video-conferencing was used in 88% of these studies. Only 19 (20%) included an independent control group, including 9 (10%) randomized control trial (RCT) studies. One third of studies were based on samples of less than 20 patients, and only 21% had samples of over 100 patients. Aspects of patient satisfaction most commonly assessed were: professional-patient interaction, the patient’s feeling about the consultation, and technical aspects of the consultation. Only 33% of the studies included a measure of preference between telemedicine and face-to-face consultation. Almost half the studies measured only 1 or 2 dimensions of satisfaction. Reported levels of satisfaction with telemedicine are consistently greater than 80%, and frequently reported at 100%. Progression of telemedicine services from ‘trial’ status to routine health service must be supported by improved research into patients’ satisfaction with telemedicine. Further investigation of factors that influence patient acceptance of telemedicine is indicated.

Keywords: Randomized Controlled Trial, Face-to-Face, Primary-Care, Medical-Care, Pilot Project, Telemedicine Consultations, User Satisfaction, General-Practice, Federal Bureau, Meta-Analysis