Osamu Maruyama

A testing apparatus for study and evaluation of the effebcts of fluid dynamic shear stress on hemolytlc property blood under the real Reynolds number conditions for rotary blood pumps has been developed. This paper aims at clarifying the fluid dynamic characteristics of the apparatus that consists of afixed inner cyhnder and a rotating outer container forming a vertical cylindhcal gap and two horizontal conical gaps at the top and the bottom. On the basis of the Rayleigh-Taylor's analytical criterion, it is proved that the fluid driven only by the outer container does not develop centhfugal instabihties in the vertical gap. Therefbre, all the dynamics of the fluid is governed by phenomenon in the hohzontal gaps. As the cone angle is small, a deschption based on the rotating disk theory is apphcable fbr the dynamics in the conical gaps. An experimental investigation utiizing two hquids revealed that the flow sustains simultaneously laminar and turbulent regions and there is a chtical Reynolds number corresponding the spatial boundary that moves with the rotational speed.

Reynolds stress

10.5136/lifesupport.13.14

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DEVELOPMENT AND PRACTICAL USE OF CONCRETE ROADBED FOR SLAB TRACK ON EARTHWORKS

World Transport Research: Selected Proceedings of the 8th World Conference on Transport ResearchWorld Conference on Transport Research Society (1999)

Kazuya Ando S. Miura Jun Okazaki Makoto Sunaga Hihumi Aoki

In recent years the destructive force to the track has increased with the rise of train speed and the increase in the number of trains, therefore, more labor and expenditure are needed to maintain the track in good condition. The purpose of this study is to develop an economical and reliable low-maintenance track structure. The authors proposed a concrete roadbed system for slab track which could be laid on embankments and cuttings. This paper describes the history and present status of slab track, proposal of the new track structure, test-laying and its performance tests of full-sized track, the test under train running at the Hokuriku Shinkansen line.

Earthworks

Slab

Railway line

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Development of Ultrasonic Vibration Hot Embossing Replication Technique

Kiso Junkatsu Sekkei Bumon Kouenkai kouen rombunshuu/Kiso Junkatsu Sekkei Bumon Koenkai koen ronbunshu (2004)

Harutaka Mekaru Osamu Nakamura Tadashi Hattori Osamu Maruyama

In order to enable precise microfabrication with a high aspect ratio, the new replication technique which combined hot embossing and ultrasonic vibration was suggested. In this method, it is the feature to add vertical ultrasonic vibration to a metallic mold and a resin sheet in holding process after applying load. Consequently, it is promoted that plastic flows into the precise pattern of a metallic mold, and the accuracy of transfer improves remarkably. We tested using a Ni mold with micro-pattern, and polycarbonate. It turned out that contacting force became low and holding time was also sharply shortened compared with a conventional hot embossing technique.

Embossing

Polycarbonate

Replication

Mechanical vibration

10.1299/jsmemdt.2004.4.71

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Osamu Maruyama

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