Defense Academy Research Articles

Will Japan go nuclear? Myth and reality

Predominant international relations theory holds that a state will stop at nothing to protect itself and survive in a basically anarchic international environment. Matake Kamiya confronts recent speculation that Japan is unlikely to be an exception to this rule. To convince others, he states, Japan must show specifically why the choice to remain nonnuclear serves its national interests, despite its latent capability to develop nuclear weapons. Kamiya is Assistant Professor of International Relations at the National Defense Academy of Japan; recently, he also served as Distinguished Research Fellow at the Centre for Strategic Studies in New Zealand.

Preliminary assessment of tunnel wall interference in the NDA cryogenic wind tunnel

As the second stage of a preliminary cryogenic airfoil testing program, the test section interference of the National Defense Academy cryogenic tunnel was evaluated. A R4 airfoil model, which has the chord length of 12 cm and the aspect ratio of 0.5, was tested in the range of Mach number 0.5 to 0.75, and that of Reynolds number 7 x 106 to about 1.1 x 10 7. The experimental results were corrected with empirical wall interference correction methods, the Barnwell-Sewall method for sidewall boundary layers, and the Blackwell method for the top and bottom walls. This preliminary evaluation showed that the sidewall boundary layers dominate the tunnel wall interference of the present cryogenic tunnel, and there may be some possibility of utilizing the tunnel for performing two-dimensional airfoil tests if more precise wall interference parameters are obtained. Nomenclature b = tunnel width Cp = pressure coefficient Cp = equivalent pressure coefficient c = chord length of the airfoil cn = section normal force coefficient H = shape factor M - local Mach number Mc = corrected freestream Mach number ME = averaged experimental Mach number at the wall over the airfoil MT = averaged theoretical Mach number at the wall over the airfoil Mx = tunnel freestream Mach number M^, = equivalent Mach number a = angle of attack AMB = blockage Mach number correction AMy = sequential Mach number correction AMw = sidewall Mach number correction 8* = sidewall displacement thickness Subscripts ambient condition

日本の衝撃超高圧力研究‐１９８０年以前

The first study of shock very high pressure in Japan started at Defense Academy of Japan in the latter half of 1950. About 1970, there was a movement to establish National Very High Pressure Laboratory, which ended unsuccessful. Science and Technology Agency, however, performed research and development on shock very high presuure as a project in 1972-75 and 1977-79. The project was the start to introduce a remarkable progress in shock experiment technology in Japan.

防衛大学校低温風洞の特性 （第２報） 常温及び低温特性

From the previous operational experience for the high speed cryogenic tunnel at National Defense Academy (NDA), its original manual control systems were partially modified, and a limited automatic control capability has been added. Though this modification was intended to improve the steady state operation, the control accuracy of both of the steady and transient operations was greatly improved, compared with that of the previous manual controls. The preliminary tunnel calibration tests were intensively performed at both of ambient and cryogenic temperatures, and the results indicate that the NDA cryogenic tunnel satisfied the assigned specifications, and has sufficient potential to perform basic airfoil testings in a cryogenic temperature range.

防衛大学校低温風洞の特性 （第１報） 手動制御による運転

A 2-dimensional, small high speed cryogenic wind tunnel was constructed at National Defense Academy (N. D. A.) in 1985, using the stainless steels of SUS 304 and SCS 13 as materials of the pressure shell. The features of the cryogenic tunnel and its operation procedures are described. The initial operational tests were intensively performed to refine the general operation method to the optimum for the present tunnel with the original manual control systems. Those tests showed that the original control systems were fairly acceptable, but had to be modified to automatic controls for more precise control of the tunnel flow conditions at cryogenic temperature range and expanding its actual operational envelope.

Reflections on the Dilemma of Japanese Defense

Research Article| May 01 1986 Reflections on the Dilemma of Japanese Defense Chalmers Johnson Chalmers Johnson Search for other works by this author on: This Site PubMed Google Scholar Far Eastern Survey (1957) 26 (5): 557–572. https://doi.org/10.2307/2644482 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Chalmers Johnson; Reflections on the Dilemma of Japanese Defense. Far Eastern Survey 1 May 1957; 26 (5): 557–572. doi: https://doi.org/10.2307/2644482 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAsian Survey Search This content is only available via PDF. Copyright 1986 The Regents of the University of California Article PDF first page preview Close Modal You do not currently have access to this content.

On the decay of correlation for piecewise linear transformations : Makoto Mori, Defense Academy, Yokosuka, Japan

On the decay of correlation for piecewise linear transformations : Makoto Mori, Defense Academy, Yokosuka, Japan

Surface Elastic Waves on Piezoelectric Ceramic Plates Under the Influence of Bending Stress

Journal of the American Ceramic SocietyVolume 59, Issue 1-2 p. 79-79 Surface Elastic Waves on Piezoelectric Ceramic Plates Under the Influence of Bending Stress KOHJI TODA, KOHJI TODASearch for more papers by this authorSHIN-ICHI KATO, SHIN-ICHI KATOSearch for more papers by this author KOHJI TODA, KOHJI TODASearch for more papers by this authorSHIN-ICHI KATO, SHIN-ICHI KATOSearch for more papers by this author First published: January 1976 https://doi.org/10.1111/j.1151-2916.1976.tb09396.xCitations: 1 The writers are with the Department of Electrical Engineering, National Defense Academy, Hashirimizu, Yokosuka, 239, Japan. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume59, Issue1-2January 1976Pages 79-79 RelatedInformation

The Low Density Wind Tunnel at Defense Academy

The Low Density Wind Tunnel at Defense Academy