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Nishiura C.,Tokyo Gas Co. | Hashimoto H.,University of Tokyo
Journal of Epidemiology | Year: 2010

Background: Studies of Western populations have shown an inconsistent longitudinal association between short sleep duration and change in body mass index (BMI); a recent Japanese cohort study reported a significant association in men, but over a 1-year period. The aim of this longitudinal study was to examine whether this association was robust over a 4-year interval in Japanese men. Methods: A total of 3803 middle-aged Japanese male white-collar workers (mean age 47.8 years, mean BMI 23.9 kg/m2) in Tokyo, Japan, were included in this study from 1994-1995 (baseline) to 1998-1999 (follow-up). Height and weight were objectively measured at annual health checkups, and other data, including sleep duration, were collected using a structured interview. We used linear regression models to estimate change in BMI, after adjustment for covariates. The reference category for sleep duration was set to 7 hours, to conform with previous studies. Results: As compared with participants sleeping 7 hours, those sleeping 5 hours or less had a significantly higher BMI at baseline (beta coefficient: 0.34 kg/m2, 95% confidence interval (CI): 0.03, 0.65) and gained 0.15 kg/m2 in BMI over 4 years (95% CI: 0.03, 0.27), after adjustment for age, baseline BMI, lifestyle behavior, and medication. Conclusions: The longitudinal association between short sleep duration at baseline and relative increase in BMI was significant in Japanese male workers over a 4-year interval. © 2010 by the Japan Epidemiological Association.

Matsui T.,Tokyo Gas Co. | Imamura S.,Environmental Solutions Headquarters
Bioresource Technology | Year: 2010

This paper studies the way to remove siloxanes from digestion gas of sewage sludge by adsorbents. Many adsorbents were tested by using the model gas of siloxane in nitrogen. The adsorption ratio was 0.056-0.192 for the activated carbons, 0.004-0.077 for the molecular sieve and 0.104 for the silica gel. An observed tendency was that the activated carbons showed high adsorption ratio, and that the adsorption ratio was increased when BET surface area was higher, and the pore volume was higher and the pH value was higher. Finally, we found a few kinds of activated carbons with the superior ability of adsorption, and we tested the ability of them by using the real digestion gas. All of the siloxanes were found to be removed in the 1000 h test. © 2009 Elsevier Ltd. All rights reserved.

Tokyo Gas Co. | Date: 2012-03-26

A carbon dioxide tank (

Tokyo Gas Co., JNC ENGINEERING Co., Kyushu University and Adsorption Technology Industries Ltd. | Date: 2013-06-14

A simple and inexpensive gas separation device is provided. The gas separation device (

Tokyo Gas Co., JNC ENGINEERING Co., Kyushu University and Adsorption Technology Industries Ltd. | Date: 2013-06-14

A gas separation device having a simple structure and reducing the cost incurred in gas separation. The gas separation device (

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