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Nitron tetrachloroaurate(III) electrodes with poly(vinyl chloride) and liquid membranes for the selective determination of gold

Hassan, Saad S.M.; Elnemma, Eman M.; Hamada, Marawan A. ( Elsevier , 1991 , Article)

PVC matrix and liquid membrane electrodes have been developed for direct potentiometric determination of gold(III). The membranes incorporate nitron tetrachloroaurate(III) as electroactive material. Fast response for ...

Open-ended cloze procedure and multiple - choice cloze procedure: similarties and differences

Al-Buainain, Haifaالبوعينين, هيفاء ( Qatar University , 1991 , Article)

This paper is a validation of two cloze procedures: Open-Ended and Multiple-Choice (henceforth OE and MC respectively). Open-Ended and Multiple-Choice tests on the same text were administered to 60 English majors in their ...

Thermal dimensional stability of isotropic polyoxymethylene

Zahran, R. R.; Abolmagd, A. A. ( John Wiley & Sons, Ltd. , 1991 , Article)

A parametric mapping analysis of the effect of various structural and morphological parameters on the thermal dimensional stability of polyoxymethylene is highlighted. The molecular composites model is found to describe ...

Solidification Of Steel Billets In Continuous Casting

Kandeil, A.Y.; Tag, I.A.; Hassab, M.A. ( Qatar University , 1991 , Article)

For practical operation, it is necessary to know how the solidification of liquid steel progresses i.e. when and where a strand has completely solidified. Decisions on, the casting speed, the spray water flow rates and ...