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1

A Prescriptive Exercise Program for Health Maintenance

Yamashita A., Kawakami M., Inagaki Y., Ohkubo T.

International Journal of Occupational Safety and Ergonomics

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2001

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Vol. 7, No. 2

195--209

EN

The aim of this study was to design a prescriptive exercise program for people of various age and fitness basing on the popular in Japan Radio Physical Fitness Exercise, a program based on an experimental approach. The evaluation indices used in the experiment were heart rate (HR), oxygen consumption, and electrical activity of the rectus femoris, latissimus dorsi, and trapezius muscles, which measured during various motion elements of the program performed at various rate. The results of this study enable to calculate equations for predicting HR during exercise from relative metabolic rate (RMR). The data on HR, RMR, and myoelectric potential presented in this study may be a basis for designing individual exercise programs for elderly people.

2

Decomposition of toluene by a dielectric barrier discharge reactor with a catalyst coating electrode

Kanazawa S., Li D., Akamine S., Ohkubo T., Nomoto Y.

Transactions of the Institute of Fluid-Flow Machinery

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2000

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Nr 107

65-74

EN

The improvement in the decomposition of volatile organic compounds (VOCs) was investigated by combining discharge plasma with photocatalyst (TiO2). The reactor consists of a coaxial cylindrical electrode system and dielectric barrier discharge is used for the processing. In order to combine discharge plasma with photocatalyst, an electrode with photocatalyst was developed as an inner electrode instead of the conventional metal electrode. Time dependence of toluene decomposition was compared for the reactors with and without photocatalyst. As a result, in dilute toluene (20-25 ppm) at an energy consumption of 18 J/l, time averaged toluene decomposition rates by the conventional type reactor, the photocatalyst-plasma reactor with TiO2 pellets, the photocatalyst-plasma reactor with TiO2 coating electrode were 31% at 5.8 g/kWh energy efficiency, 45% at 6.9 g/kWh, and 59% at 8.9 g/kWh, respectively. It found that the combination of the plasma and TiO2 was effective for improving toluene decomposition at lower applied voltages and the lower energy consumption.

PL

Rozkład toluenu w reaktorze wyładowania dielektrycznego z elektrodą pokrytą katalizatorem. Badano możliwość zwiększenia skuteczności rozkładu lotnych związków organicznych w powietrzu poprzez jednoczesne zastosowanie plazmy wyładowania elektrycznego i katalizatora (TiO2). Reaktor wyładowania dielektrycznego zbudowany był z układu współosiowych elektrod cylindrycznych. Elektroda wewnętrzna pokryta była katalizatorem. Porównano rozkład toluenu w czasie dla reaktora z katalizatorem i bez katalizatora. Wyniki badań wykazały, że w mieszaninie powietrza z toluenem (20-25 ppm), przy użycie energii 18 J/dm3, skuteczność rozkładu toluenu wynosiła: w reaktorze bez katalizatora - 31%, przy wydajności 5,8 g/kWh; w reaktorze z pastylkami TiO2 - 45%, przy wydajności 6,9 g/kWh w reaktorze z elektrodą wewnętrzną pokrytą TiO2 - 59%, przy wydajności 8,9 g/kWh. Z przeprowadzonych badań wynika, że zastosowanie kombinacji wyładowania dielektrycznego z katalizatorem zwiększa skuteczność rozkładu toluenu w powietrzu przy niskich napięciach zasilania i małym zużyciu energii.

3

Job Redesign Needs for Aged Workers

Kawakami M., Inoue F., Ohkubo T., Ueno T.

International Journal of Occupational Safety and Ergonomics

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1998

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Vol. 4, No. 4

471--483

EN

The aim of this paper is to explore and present a proposal for redesigning elements of the workplace for agech workers. The method of research was to observe, record, and measure the actions of sitting workers performing assembly operations on electrical products in the Kani Plant Nagoya Works of Mitsubishi Electric Co. (Japan). The evaluation index used in the experiment was obtained by measuring time motion elements, cycle time per product, and motion velocity waves of elderly workers. Those motion characteristics were then compared to the motion characteristics of young workers. The results led to job redesign elements being identified to reduce handling factors of high difficulty for aged workers and to the necessity to consider a coefficient of correction in Method Time Measurement (MTM) according to differences in the manufactured object’s weight.