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Investigating Data Entry Task Performance on a Laptop Under the Impact of Vibration: The Effect of Color

Mallick Z.

International Journal of Occupational Safety and Ergonomics

2007

Vol. 13, No. 3

291--303

The last 20 years have seen a tremendous growth in mobile computing and wireless communications and services. An experimental study was conducted to explore the effect of text/background color on a laptop computing system along with variable environmental vibration on operators’ data entry task performance in moving automobiles. The operators’ performance was measured in terms of the number of characters entered per minute without spaces (NCEPMWS) on a laptop computing system. The subjects were divided into 3 categories, namely, Novices, Intermediates and Experts. Findings suggest a re-evaluation of existing laptop designs taking ergonomics into consideration. It appears that proper selection of text/background color on the laptop coupled with controlled vehicular speed could result in a better quality of interaction between human and laptops and it could also resolve the problem of poor data entry task performance.

Verifying the assumption of a steady-state intermediate concentration

Głowiński J., Tylus W.

Polish Journal of Chemical Technology

1999

Vol. 1, nr 1

7-10

The behaviour of the chemical affinity at the stage of intermediate product formation was analysed in a monomolecular, a homogenous catalytic and in a nucleophilic substitution reactions. Under conditions of the steady-state approximation, the rate of change of the chemical affinity at this stage of reaction must be such that the rate of intermediate formation and that of its decay are nearly identical. This assumption was used to determine a quantitative criterion for the steady-state approximation. The method used to derive a criterion is also given. The examples of applications were provided.