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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Publication Search Results

Now showing 1 - 10 of 59

Consequences of coaxial jet penetration performance and shaped charge design criteria
(Monterey, California. Naval Postgraduate School, 2010) Hasenberg, David; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS)
There are longstanding interests in multi-material shaped charge liners for purposes of, for example, diagnosing jet formation, overcoming coherent flow limitations, and enhancing behind the target effects. This research shows the possibilities for generating stable multi-material coaxial shaped charge jets. General design criteria and guidelines for multi-material coaxial jetting and penetration are developed and investigated, based on experimental data and simulation of a 100 mm charge. Further, the influence on jet coherency and the effect of density variation on penetration is studied. Findings are in agreement with Harisson's and Walker's coherency theory, showing that the flow velocity is the key factor for jet coherency. Multi-material design concepts are presented and tested with the finite difference code ANSYS AUTODYN
Optical turbulence and rawinsonde measurements for 17-28 September 1989 at Anderson Mesa/United States Naval Observatory, Flagstaff, Arizona
(Monterey, CA; Naval Postgraduate School, 1990) Vaucher, Christopher A.; Walters, Donald L.; Vaucher, Gail M. Tirrell; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Physics
The Naval Postgraduate School Atmospheric Optics Group acquired atmospheric optical turbulence and navaid radiosonde (rawinsonde) data in the Flagstaff, Arizona region part of a site survey for a large-scale, ground-based, synthetic aperture system (100-300 m baseline stellar interferometer). From 17 to 25 September 1989, measurements were taken from the Lowell Observatory 31- inch telescope dome facility on Anderson Mesa, 16 km southeast of Flagstaff. Further sampling occurred 26-28 September 1989 from the United States Naval Observatory's (USNO) 61-inch telescope dome, approximately 8 km west of Flagstaff. The parameters measured consisted of transverse coherence lengths, isoplanatic angles, and various meteorological surface and upper-air variables measured from a high resolution, instrumented balloon (rawinsonde) system. This report compiles, analyses and summarizes the acquired data. A summary of the synoptic scale activities occurring simultaneously over the data acquisition sites is also presented
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
Shipboard observations of mean and turbulent atmospheric surface layer quantities SCCCAMP data report, Part I
(Monterey, CA; Naval Postgraduate School, 1986-05) Skupniewicz, C. E.; Borrmann, S.; Fellbaum, C.; Shaw, William J.; Vaucher, Christopher A.; Vaucher, Gail M. Tirrell; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Physics
3 Weeks of aerometric observations from a shipboard platform are described and analyzed to obtain surface layer quantities relevant to the dispersion of pollutants from offshore oil operations. Momentum, heat, and moisture flux were estimated with two different methods: the dissipation technique and bulk parameterizations. Diffusion scale turbulence was measured with bivane anemometers and estimates of ship motion contributions to these measurements were performed. Keywords: Turbulence diffusion; Measurements; and Santa Barbara Channel. (Author)
Review of interactions between the Naval Postgraduate School and the Naval Undersea Warfare Engineering Station, 1973-1986
(Monterey, CA; Naval Postgraduate School, 1986-06) Marimon, R. L.; Wilson, O. B. (Oscar Bryan); Esary, James Daniel; Uber, Brian; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Operations Research
Radiation from intense electron beams associated with the Cerenkov mechanism
(Monterey, CA; Naval Postgraduate School, 1984-06-01) Neighbours, John R.; Buskirk, Fred R.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Physics
Free Electron Laser material damage studies
(Monterey, California. Naval Postgraduate School, 2000-11) McGinnis, Roger D.; Thomson, R. W.; Short, L. R.; Herbert, A.; Lampiris, D.; Christodoulou, A.; Colson, W. B.; Shinn, M. D.; Neil, G.; Benson, S.; Gubeli, J.; Evans, R.; Jordan, K.; Physics (PH); Thomas Jefferson National Accelerator Facility; Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Institute for Joint Warfare Analysis
Today's surface ships are faced with an increased vulnerability to anti-ship cruise missiles, due to a change from operating in open oceans to primarily operating in the world's littorals. One possible solution to counter this threat is the use of a high-energy laser to destroy the missiles in flight. The Free Electron Laser is possibly the best choice of lasers for a marine environment since its wavelength can be changed over a wide range allowing the operator to choose the best wavelength to transmit through the atmosphere. Material damage studies on various anti-ship cruise missile materials were carried out at Thomas Jefferson National Accelerator Facility (TJNAF) in Newport News, Virginia. Experimental procedures presented in this report allow a scaled down laser of a few hundred to a few thousand watts to evaluate the damage from a weapon size laser of the megawatt class. The EEL beam bombards the target with a steady stream of picosecond length pulses at rates of 18MHz or greater. No other experiments have previously been done to explore the effects of the EEL pulse on materials. This report contains the work of several theses conducted at the Naval Postgraduate School over the past two years, and has been a productive cooperation among NPS, TJNAF, NRL, and NSWD at Port Hueneme, to the benefit of the Department of Defense.
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.