Organization: Physics (PH)
orgunit.page.dateEstablished
orgunit.page.dateDissolved
City
Country
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.
Type
Website of the organization
ID
31 results
Publication Search Results
Now showing 1 - 10 of 31
Publication Lompoc Valley Diffusion Experiment analysis - Mt. Iron comparison and two zone convective scaling model(Monterey, California. Naval Postgraduate School, 1992-01) Skupniewicz, C.E.; Kamada, Ray; Drake, S.A.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); PhysicsLVDE(Lompoc Valley Diffusion Experiment) was conducted Aug 1989 to assess the potential risk of gaseous releases from the Hypergolic Stockpile and Storage Facility at Vandenberg AFB. Results of the LVDE are compared to the predictive equations of the Mt. Iron Diffusion Tests, conducted at Vandenberg in the 1960's. The Mt. Iron equation parameterizes diffusion with on-base meteorological tower input data. Regression techniques similar to those of Mt. Iron are used in this comparison, resulting in LVDE equations which use the same meteorological data as input. Instantaneous and time averaged centerline concentrations, in both flat and complex terrain are analyzed. For all cases LVDE concentrations are shown to decrease with range less rapidly than the Mt. Iron equation predicts. We suggest that this bias is due to gravitational and/or scavenging losses of the tracer material used in Mt. Iron. A 'two-zone' convective scaling equation is developed which diffuses the plume differently in cloud covered and clear sky portions of the domain. The method is shown to be superior to homogeneous convective scaling equations, and comparable to a statistical approach based on the plume measurements. While the method works for maximum concentration predictions, it fails for plume width and crosswind integrated concentration for X > 6Publication 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.); PhysicsAs 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 bunchesPublication Basic Research in Thermoacoustic Heat Transport(Monterey, California. Naval Postgraduate School, 1996-06-11) Atchley, Anthony A.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); PhysicsThis technical report details progress in basic research in thermoacoustic heat transport made during the period June 1, 1995 through May 30, 1996. Research efforts were primarily concentrated in three areas: 1) investigation of fundamental limitations to the performance of thermoacoustic devices; 2) design, construction, and demonstration of a proof-of-concept, shipboard, heat driven thermoacoustic cooler capable of cooling loads of 1 kW; 3) measurement of transient effects in thermoacoustic devices to provide data to test nonlinear, timedependent models of thermoacoustics. Accomplishments include 1) the design of a prototype toroidal prime mover; 2) preliminary measurements of the temperature evolution along a stack in a mechanically driven configuration; 3) preliminary measurements of transient effects in prime movers; 4) preliminary design of a new prime mover configuration; and 5) fabrication of a 1 kVV heat driven cooler. A publications, patents, presentations, and honors report is also included.Publication Sea test development of laser altimeter(Monterey, California. Naval Postgraduate School, 1991-01) Crittenden, Eugene Casson; Rodeback, George Wayne; Milne, Edmund Alexander; Cooper, Alfred William; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); PhysicsLow altitude (81 m.) narrow-beam laser reflectance measurements were made from the nearly ocean-like water surface under the Golden Gate bridge. This site allowed precise measurements not possible from flying platforms. For short wavelength water waves superimposed on swell, the signal amplitude probability distribution showed periods of zero return signal, even for vertical incidence, apparently due to tipping of the average water surface. The nonzero signals show an antilog-normal probability distribution, skewed toward higher signal than that provided by a normal (Gaussian) distribution. With incidence angle displaced from the vertical, the distribution shape is retained but with more frequent zero reflections. The decrease with angle of the average signal, including the zeroes, is well fitted with a Gram-Charlier distribution, as seen by earlier observers using photographic techniques which masked these details of the structure. For the simpler wave pattern due to a long sustained wind direction, the signal amplitude probability distribution is lognormal with no zero signal periods. For this case, the distribution shifts toward exponential at large angles from the vertical. For surface states intermediate between the above two extremes the distribution is often normal. The larger return signals resulting from the skew toward larger amplitudes from lognormal are more favorable for disposable laser altimeters than previously believed. Also for an altimeter which may be swinging from a parachute or balloon, the return at angles from the vertical remains high. The presence of occasional zero return signal does degrade the accuracy of altitude somewhat for a descending altimeter, but the signal available assures performance at larger altitudes than previously expected.Publication Emission threshold for Cerenkov radiation(Monterey, CA; Naval Postgraduate School, 1985) Neighbours, John R.; Buskirk, Fred R.; Maruyama, Xavier K.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); PhysicsPublication Modification, testing, and calibration of infrared search and target designator hardware received from NSWC(Monterey, California. Naval Postgraduate School, 1989-05) Crittenden, Eugene Casson; Cooper, Alfred William Madison; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); PhysicsPublication 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); PhysicsPublication 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); PhysicsPublication 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); PhysicsPublication 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); PhysicsWork 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.