Organization:
Physics (PH)

Description

The mission of the Physics Department is to provide defense-relevant, advanced education and research programs to meet Naval unique needs, and increase the warfighting effectiveness of the U.S. Naval Forces, DoD and allied armed forces.

Website of the organization

https://nps.edu/web/physics

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(2014-04-23) Physics (PH); Graduate School of Engineering and Applied Science (GSEAS); Physics
Evaluation process for chemical/biological/radiological hazard assessment models
(Monterey, California. Naval Postgraduate School, 1996-08) Schacher, G. E. (Gordon Everett); Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Research and Sponsored Programs Office (RSPO); Physics
Primes: The first two thousand four hundred prime numbers
(Monterey, California. Naval Postgraduate School, 1990-12) Kinney, Gilbert Ford; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Research and Sponsored Programs Office (RSPO); Physics
These simple and mathematically elegant but practically useless prime number listings could have an appeal for afficionados of elementary number theory. They were prepared using a computer adaptation of the Sieve of Aratosthenes of Alexandria and the computations made on a small personal computer with an 8-bit microprocessor, a 64K random access memory, and a 2- megahertz clock. Computing time for checking 21, 380 integers and identifying the included 2400 prime numbers was about thirty minutes. This computational effort is quite modest compared to others such as two which are reported to have examined the first ten million integers. But the mere 2400 primes reported here, plus related items such as the number of prime twins and the integer gap between successive primes, are presented in tangible form
Cerenkov and sub-Cerenkov radiation from a charged particle beam
(Monterey, CA; Naval Postgraduate School, 1987) Neighbours, John R.; Buskirk, Fred R.; Maruyama, Xavier K.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Physics
As a consequence of the relaxation of the phasing conditions between the moving charge and radiated wave for finite beam path lengths, the Cerenkov peak is broadened and the threshold energy is developed which is applicable to charged beams consisting of single point charge or charge bunch of finite size, as well as beams consisting of periodically repeated bunches
Annual summary of basic research thermoacoustic heat transport: 1992
(Monterey, California. Naval Postgraduate School, 1992-11) Atchley, Anthony Amstrong; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
This annual report details progress in basic research in thermoacoustic heat transport irade during the period October 1, 1991 through September 30, 1992. Our major research efforts were concentrated in two ateas during FY1992: 1) a standing wave analysis of the low amplitude performance of thermoacoustic prime movers both below and above the onset of self-oscillation and 2) a study of finite amplitude standing waves in both harmonic and anharmonic tubes. In addition to these areas, FY1992 research efforts also included the investigation of heat driven refrigerators and preliminary work on investigations of thermoacoustic engines with laser Doppler anemometry. This technical report summarizes the important results of these projects. A publications, patents, presentations, and honors report is also included.
Laser altimeter for use over the ocean
(Monterey, California. Naval Postgraduate School, 1989-04) Bourne, Carlton M.; Crittenden, Eugene Casson; Rodeback, George Wayne; Cooper, Alfred William; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
Annual Summary of Basic Research in Thermoacoustic Heat Transport: 1990
(Monterey, California. Naval Postgraduate School, 1990-10) Atchley, Anthony Amstrong; Hofler, Thomas James; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
Wave turbulence and soliton dynamics
(Monterey, California. Naval Postgraduate School, 1992-04) Keolian, Robert M.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
Work in three areas is summarized in this report. 1) Two new localized structures were experimentally discovered in vibrating lattices and were described theoretically with a nonlinear Schrodinger eguation. One is a domain wall between different types of vibration, the other is a kink in the phase of vibration. The kink has also been discovered in parametrically driven surface waves on water. 2) The direction and spectral energy of interacting nonlinear ocean waves evolve as they approach a sloping beach. A first principles theory was developed for this process and it was shown to agree with ocean experiments. 3) Experiments to determine whether random interacting waves on the ocean move collectively, having average quantities analogous to "pressure" in a gas as well as collective modes of vibration, are described.
A comparison of eight cases selected from the vandenberg AFB Mt. Iron tracer study with results from the Lincoln/Rimpuff dispersion model
(Monterey, California. Naval Postgraduate School, 1991-12) Kamada, Ray; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
Improved Efficiency and Power Density for Thermoacoustic Coolers
(1994-06) Hofler, Thomas J.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
Research on improving the efficiency, cooling power, and cooling power density of thermoacoustic refrigerators is described. A heuristic analysis of short thermoacoustic heat exchangers in a high amplitude sound field is given. A heat exchanger experiment, utilizing a very high amplitude thermoacoustic prime-mover, shows some agreement with the heuristic analysis. This indicates that acoustic losses in the heat exchanger can be drastically reduced in high amplitude engines, while maintaining good thermal effectiveness. Other related, but more applied, research is briefly discussed. This includes the design and construction of a compact, portable, air-cooled, thermoacoustic refrigerator for the purpose of producing frost at a lecture demonstration. This design has roughly the same temperature span (40 deg C) as required by shipboard applications. Also, two new electrodynamic acoustic drivers have been designed and one design has been constructed. These designs offer high efficiency, good power density, and low cost and are probably scalable up to significantly higher acoustic power levels.