Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

from the Lagrangian of the system. The thin shell theory used in this derivation includes three displacements and two changes
of curvature. Thus, the effects of membrane, bending, shear deformations, and rotatory inertias are included in this theory. The
resulting five coupled partial differential equations are self-adjoint and positive definite, ensuring real and positive eigenvalues
and real eigenfunctions. The frequency-wavenumber spectrum has five branches (three acoustic and two optical) representing
flexural, longitudinal, torsional, and thickness-shear modes. The acoustic branches have the correct group and phase velocities,
especially in the high wavenumber, short wavelength limits.
DTIC
Equations of Motion; Shell Theory; Vibration; Underwater Acoustics; Prolate Spheroids; Shells (Structural Forms)
20010025741 Naval Surface Warfare Center, Carderock Div., Bethesda, MD USA
The Role of Coupling Forms and of Coupling Strengths on the Induced Loss Factor Final Report
Maidanik, G.; Becker, K. J.; Dec. 14, 2000; 47p; In English; Original contains color plates
Report No.(s): AD-A385849; NSWCCD-70-TR-2000/201; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche
The role played by the coupling forms and coupling strengths in determining the induced loss factor of a master oscillator
due to its coupling to a set of satellite oscillators is assessed and evaluated.
DTIC
Oscillators; Coupling
20010025812 Massachusetts Inst. of Tech., Cambridge, MA USA
Outstanding junior investigator program Final Report, 1 Aug. 1992 - 31 Oct. 1997
Randall, L.; Rosenberg, L.; Dec. 18, 1999; 28p; In English
Report No.(s): DE00-758843; No Copyright; Avail: Department of Energy Information Bridge
Much of the authors work over the past five years has been aimed at bridging the gap between the exactly supersymmetric
world of string theories and the world that is actually observed. Her report discusses the following subjects: (1) supersymmetry
breaking; related work on the mass hierarchy and the relation between supersymmetry and grand unified theories; distinguishing
between supersymmetric models; and the fundamental question of how gauge theories arise from D-branes.
NTIS
Supersymmetry; Strings; Gauge Invariance; Broken Symmetry
71
ACOUSTICS
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20010022794 Institute for Human Factors TNO, Soesterberg, Netherlands
Rating Sound Level for Shooting Sounds around the ”Infanterie Schietkamp” Shooting Ranges Final Report Geluidbelasting
rondom het infanterie schietkamp ten gevolge van schietoefeningen in het kamp
Vos, J., Institute for Human Factors TNO, Netherlands; Geurtsen, F. W. M., Institute for Human Factors TNO, Netherlands; Nov.
29, 2000; 46p; In Dutch
Contract(s)/Grant(s): A00/KL/394; TNO Proj. 786.3
Report No.(s): TD-2000-0334; TM-00-A057; Copyright; Avail: Issuing Activity
The Ministry of Defence required detailed information about the noise exposure around the ”Infanterie Schietkamp” firing
ranges resulting from the shooting sounds produced in the present and in a future situation. Methods: The noise exposure was
expressed as the rating sound level, Lr , in dB(A). With respect to the community response, L r for shooting sounds is comparable
to the equivalent-continuous A-weighted sound level that is used as the predictor for more continuous sounds such as those produced
by road traffic. For the prediction of the sound levels at the points of the receivers, linear relationships between the sound
levels of the bangs and the distance on a logarithmic scale were used. For a number of firearms, these propagation functions were
combined with directivity patterns. The numbers of shots fired in the day-, evening-, and night-time were provided by the Ministry
of Defence. Additional reductions in the levels resulting from sound barriers were taken into account. Results: In the greater residential
areas of Harskamp, Radio-Kootwijk, Kootwijk, Hoenderloo, and Otterlo, it was found that I, resulting from the shooting
sounds produced in the day-time, ranged between 47 and 52 dB(A). Except for the residential area of Radio-Kootwijk, L r in the
evening-time was lower than 50 dB(A). In the night-time L r was lower than or equal to 50 dB(A) in all areas. At some receiver
points, introduction of a modified high explosive shell for the 120-mortar results in a decrease in Lr of about 1 or 2 dB. Conclu-
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