| Site Fidelity, Associations and Long-Term Bonds of Short-Finned Pilot Whales off the Island of Hawai'i |
Jan 2012 |
152 pages |
| Authors:
Sabre D Mahaffy; PORTLAND STATE UNIV OR
|
 | Short-finned pilot whales (Globicephala macrorhynchus) are the most frequently sighted odontocete in a long-term study in Hawa'i (representing 23.8% of all odontocete sightings from directed research efforts), yet little has been published on this species in Hawaiian waters. Studies elsewhere have suggested that short-finned pilot whales travel in stable mixed-sex groups composed of strongly associated individuals; however temporal analyses of social structure are lacking. To examine site fidelity, association patterns ... |
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| A Radiative Transfer Model for Acoustic Propagation in Ocean Sediment Layers |
30 SEP 2010 |
11 pages |
| Authors:
Lisa M. Zurk; PORTLAND STATE UNIV OR
|
| The propagation of mid-frequency (1-10 kHz) acoustic waves in shallow water regions (depths of 100- 200 m) is strongly influenced by the characteristics of the ocean bottom. While there has been much progress in developing and validating bottom scattering models, much of the focus has been in the high frequency regime with comparatively less focus in the mid-frequency. This is an important topic, since in the mid-frequency regime the acoustic ... |
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| Mid-Frequency Bottom Scattering Model Development And Validation |
30 Sep 2008 |
6 pages |
| Authors:
Lisa M Zurk; PORTLAND STATE UNIV OR
|
| The propagation of mid-frequency (1-10 kHz) acoustic waves in shallow water regions (depths of 100200 m) is strongly influenced by the characteristics of the ocean bottom. While there has been much progress in developing and validating bottom scattering models, much of the focus has been in the high frequency regime with comparatively less focus in the mid-frequency. This is an important topic, since in the mid-frequency regime the acoustic field ... |
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| Mid-Frequency Bottom Scattering Model Development and Validation |
30 Sep 2007 |
6 pages |
| Authors:
Lisa M Zurk; PORTLAND STATE UNIV OR
|
| The propagation of mid-frequency (1-10 kHz) acoustic waves in shallow water regions (depths of 100-200 m) is strongly influenced by the characteristics of the ocean bottom. While there has been much progress in developing and validating bottom scattering models, much of the focus has been in the high frequency regime with comparatively less focus in the mid-frequency. This is an important topic, since in the mid-frequency regime the acoustic field ... |
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| Automatic Detection Algorithm of Intracranial Pressure Waveform Components |
25 OCT 2001 |
|
| Authors:
Mateo Aboy; James McNames; Brahm Goldstein; PORTLAND STATE UNIV OR
|
 | We describe an automated detection algorithm that may be used to identify the percussion peak (P), tidal peak (T), dichrotic notch (N), and dichrotic peak (D) components of the intracranial pressure (ICP) signal. The algorithm uses a moving average filter to remove quantization error, a lowpass filter to identify the beat series, and a local search to identify the components of each beat. The algorithm was compared with two experts' ... |
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| Secure Mobile Networking |
JUN 2001 |
182 pages |
| Authors:
James R. Binkley; John McHugh; PORTLAND STATE UNIV OR
|
| This project produced a Secure Mobile Network (SMN) system for secure enclaves or virtual networks among mobile workstations, an integrated Mobile-IP/ IPSEC system in which Mobile Nodes use 2-way tunnels to securely tunnel packets to the Home Agent. A key focus was tying Mobile-IP and IPSEC directly together. Solutions for distributed access control protocols were designed. Redundant systems overcame single-point-of-failure problems in current Mobile-IP architectures. The SMN multicast ad hoc ... |
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| Interaction of Titanium With Hydrogen Isotopes |
27 APR 2001 |
11 pages |
| Authors:
John Dash; PORTLAND STATE UNIV OR
|
| Attempts to achieve low temperature nuclear fusion can be traced to the work of Paneth, Peters, and Tanberg in 1927 . Martin Fleischmann, who in his early career was a colleague of Paneth teamed with Stanley Pons at the University of Utah to pursue this goal by the electrolysis of heavy water with a palladium cathode. Palladium is a metal which strongly absorbs hydrogen isotopes. The question they sought to ... |
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| Rapid Toxicity Assessment Using Micro-Eukaryotes |
DEC 96 |
78 pages |
| Authors:
James R. Pratt; PORTLAND STATE UNIV OR
|
| This research evaluated growth of the soil ciliate Colpoda inflata (Stokes) in rapid toxicity tests by determining sensitivity to model compounds and differences in bioavailability of toxicants in different test media. Additional studies examined the bioassay in a field situation and examined another sublethal indicator (feeding rate) in rapid toxicity tests. Related studies evaluated rapid growth tests using the alga Haematococcus lacustris using methods similar to those used in the ... |
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| Performance Analysis for DOA Estimation Algorithms, Unification, Simplification, and Observations. |
OCT 1993 |
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| Authors:
F. Li; H. Liu; R. J. Vaccaro; PORTLAND STATE UNIV OR
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| Subspace based direction-of-arrival (DOA) estimation has attracted many excellent performance studies, but limitations such as the assumption of an infinite amount of data and analysis of individual algorithms generally exist in these performance studies. We have previously proposed a unified performance analysis based on a finite amount of data, and achieved a tractable expression for the mean-squared DOA estimation error for the multiple signal classification (MUSIC), Min-Norm, Estimation of signal ... |
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