WorldCat Identities

Au, Whitlow W. L.

Works: 20 works in 66 publications in 1 language and 1,752 library holdings
Genres: Academic theses  History  Church history 
Roles: Author, Editor
Classifications: QL737.C432, 599.53
Publication Timeline
Most widely held works about Whitlow W. L Au
Most widely held works by Whitlow W. L Au
The sonar of dolphins by Whitlow W. L Au( Book )

13 editions published between 1993 and 2011 in English and held by 405 WorldCat member libraries worldwide

The extraordinary ability of dolphins to echolocate has fascinated scientists and the public since its discovery in the late 1950's. The Sonar of Dolphins is the first book to summarize modern research on this subject, and presents a broad synthesis of this very interdisciplinary subject. The author is an internationally-recognized expert on dolphin sonar and is in a unique position to bring together research on the physiological, mathematical and engineering aspects of dolphin sonar. The Sonar of Dolphins will be of interest to auditory researchers, electrical engineers, acoustical physicists, and mammalian physiologists
Hearing by whales and dolphins by Whitlow W. L Au( Book )

9 editions published in 2000 in English and held by 248 WorldCat member libraries worldwide

"In this volume, experts in different areas of the field provide an overview of the bioacoustics of whales and dolphins as well as a thorough introduction to the subject for investigators of hearing in other animals. Topics covered include the structure and function of cetacean auditory systems, the unique sound production system of odontocetes, acoustic communication, psychoacoustics, echolocation, and models of sound propagation."--Jacket
Principles of marine bioacoustics by Whitlow W. L Au( Book )

15 editions published between 2008 and 2010 in English and held by 132 WorldCat member libraries worldwide

Principles of Marine Bioacoustics is about studying the acoustics of marine animals using underwater acoustic techniques. The book discusses and unites the various areas of marine bioacoustics in a single comprehensive text. It covers important subjects associated with marine bioacoustics such as the measurement and generation of underwater sounds, the propagation of acoustic signals in the marine environment and in small tanks, signal processing techniques, and advanced devices used in the field. Also covered are topics relating to marine animals, such as methods to record and acquire acoustic signals from animals, their auditory systems and vocalizations, psychological and physiological testing procedures, and echolocation in marine mammals. This book is aimed at marine biologists and biological oceanographers. It is also relevant for professionals working with government agencies such as the National Marine Fisheries Service or organizations such as the Association of Zoos and Aquariums
Listening in the ocean : new discoveries and insights on marine life from autonomous passive acoustic recorders( Book )

8 editions published in 2016 in English and held by 17 WorldCat member libraries worldwide

This title brings to light the discoveries and insights into the lives of many marine species made possible over the last decade by passive acoustic recorders (PAR). Pop-ups, ARF, HARP, EAR, Bprobe, C-POD Atag, and Dtag are the acronyms of some of the many PARs that have changed our understanding of how marine animals live and strive in the ocean. Various types of PARs are used by different investigators in different areas of the world. These recorders have accumulated copious amounts of very important data, unveiling previously unknown information about large marine animals. Temporal, seasonal, and spatial distribution patterns have been uncovered for many marine species. There have been many discoveries, new understandings and insights into how these animals live in and utilize the ocean, and the importance of acoustics in their lives. Listening Within the Ocean summarizes these important discoveries, providing both a valuable resource for researchers and enjoyable reading for non-professionals interested in marine life
Detection and Recognition Models of Dolphin Sonar Systems by Whitlow W. L Au( Book )

2 editions published in 1988 in English and held by 2 WorldCat member libraries worldwide

The morphology of backscatter from F-layer field-aligned irregularities at mid- and high-latitudes and the generation of these irregularities by Whitlow W. L Au( )

2 editions published in 1970 in English and held by 2 WorldCat member libraries worldwide

History of the Catholic Charismatic Renewal in Hawaii by Whitlow W. L Au( Book )

1 edition published in 1997 in English and held by 1 WorldCat member library worldwide

Insights into dolphin sonar discrimination capabilities from human listening experiments by Whitlow W. L Au( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

A variety of dolphin sonar discrimination experiments have been conducted, yet little is known about the cues used by dolphins in making fine target discriminations. In order to gain insights on cues available to echolocating dolphins, sonar discrimination experiments were conducted with human subjects using the same targets employed in dolphin experiments. When digital recordings of echoes from targets ensonified with a dolphinlike signal were played back at a slower rate to human subjects, they could also make fine target discriminations under controlled laboratory conditions about as well as dolphins under less controlled conditions. Subjects reported that time-separation-pitch and duration cues were important. They also reported that low-amplitude echo components 32 dB below the maximum echo component were usable. The signal-to-noise ratio had to be greater than 10 dB above the detection threshold for simple discrimination and 30 dB for difficult discrimination. Except for two cases in which spectral cues in the form of 'click pitch' were important, subjects indicated that time-domain rather than frequency-domain processing seemed to be more relevant in analyzing the echoes
Acoustic radiation from the head of echolocating porpoises (Phocoena phocoena) by Whitlow W. L Au( Book )

1 edition published in 2006 in English and held by 1 WorldCat member library worldwide

The effects of space charges on the potential distribution in liquid dielectrics by Whitlow W. L Au( )

1 edition published in 1964 in English and held by 1 WorldCat member library worldwide

Electromagnetic wave transmission through a parabolic plasma slab at arbitrary angles of incidence( Book )

1 edition published in 1966 in English and held by 1 WorldCat member library worldwide

The power transmission and reflection coefficients are derived for electromagnetic waves propagating through a plasma slab having a parabolic electron distribution. The analysis considers transverse electromagnetic waves (TE Mode) impinging on a plasma slab at arbitrary angles of incidence. The solutions are in terms of complex hypergeometric functions and their derivatives. Numerical results for the transmission and reflection coefficients are plotted as functions of peak plasma frequency, peak collision frequency, signal frequency, slab thickness, and angle of incidence. The results of this study can be applied to transmission of electromagnetic energy through laboratory plasmas that are bounded by walls. Numerical results are in agreement with experimental results for a rectangular glow discharge plasma. (Author)
Acoustic reflectivity of nets : implications concerning incidental take of dolphins by Whitlow W. L Au( Book )

3 editions published between 1990 and 1991 in English and held by 1 WorldCat member library worldwide

Sonar target strength measurements of several types of nets and associated gear were made using simulated dolphin echo-location signals. The different types of nets included: (a) standard commercial monofilament gillnet used in the salmon mothership fishery; (b) prototype hollow core monofilament net, (c) Macah tribal cord setnet, and (d) multifilament nets. Target strength measurements were made at four angles of incidence, (normal to net), 15, 30, and 45. The standard gillnet had the smallest target strength which was relatively independent of the angle of incidence. The target strength based on the peak-to- peak values of the echoes varied from -59 to -62 dB. Using echo energy within the integration time of Tursiops truncatus, the target strength was found to be between -54 and 59 dB. Biosonar detection ranges for different sea state conditions were estimated using the noise-limited form of the sonar equation and target detection data obtained for Tursiops truncatus in Kaneohe Bay, Oahu, Hawaii. The results suggest that an echolocating dolphin should be able to detect a gillnet at ranges long enough to avoid entanglement, even in sea state 6 conditions. Several possibilities for the seeming inability of dolphins to detect gillnets are discussed
Auditory filter shapes in an Atlantic bottlenose dolphin (Tursiops truncatus) by David Westlee Lemonds( Book )

1 edition published in 1999 in English and held by 1 WorldCat member library worldwide

High frequency auditory filter shapes were calculated for a 20 year old female Atlantic bottlenose dolphin, Tursiops truncatus. Thresholds were determined for tones of 40, 60, 80, and 100 kHz masked by notched noise. Auditory filter shapes were determined by fitting the integral of the roex(p,r) filtershape to the functions relating masked tonal threshold to notch width. Filter shapes were found to be approximately symmetric at the moderate noise level used. The equivalent regular bandwidths of the auditory filters ranged from 16% of the center frequency at 40 kHz to 11% of center frequency at 100 kHz. There was very little change in the bandwidths of the filters between 60 and 100 kHz, indicating that relative tuning sharpness increases as a function of frequency in this range. Efficiency of processing after the periphery was found to be maximal at 40 and 60 kHz (better than -12 dB SNR) and to decrease gradually above 60 Khz. The efficiency estimates allowed for the reanalysis of critical ratio data collected previously for the same animal (Lemonds et al., 1997); the bandwidth estimates from the present and earlier study were found to be in good agreement
Automatic gain control in the echolocation system of dolphins by Whitlow W. L Au( )

1 edition published in 2003 in English and held by 1 WorldCat member library worldwide

Application of the Sonar Equation to Dolphins Echolocation( )

1 edition published in 1993 in English and held by 0 WorldCat member libraries worldwide

The target detection capability of the Atlantic bottlenose dolphin (Tursiops truncatus) in the open waters of Kaneohe Bay, Oahu, Hawaii will be discussed using the noise-limited form of the sonar equation. In Kaneohe Bay, Tursiops typically emit short duration transient-like broadband echolocation signals with peak frequencies between 110- 130 kHz in (Au, 1980). Therefore the generalized or transient form of the sonar equation based on energy flux density instead of intensity must be used (Urick, 1983)
Remote Monitoring of Dolphins and Whales in the High Naval Activity Areas in Hawaiian Waters( )

1 edition published in 2009 in English and held by 0 WorldCat member libraries worldwide

The axiom that knowledge is power applies directly to the problems experienced by the U.S. Navy in encountering dolphins and whales. These encounters can be avoided if more knowledge and understanding of the behavior, distribution, and movements of these animals. Simply stated, if the Navy had more knowledge of the what, where, when and why of marine mammals in a given body of water, encounters between Naval vessels and marine mammals could be reduced or avoided all together. The ocean is large and the chances of avoiding any interaction with any sizable group of marine mammals are probably much greater than the probability of encountering marine mammals
Utilizing Pro-bono Commercial Assets for Marine Mammal Surveys in High Naval Activity Area in Hawaiian Waters( )

1 edition published in 2009 in English and held by 0 WorldCat member libraries worldwide

The waters surrounding the State of Hawaii are high U.S. Navy activity regions with the presence of Pearl Harbor on the island of Oahu, the FORACS (Fleet Operational Readiness and Accuracy Check Site) acoustic range operated by the Hawaii Detachment of NUWC-Newark along the Waianae coast of Oahu, and PMRF (Pacific Missile Range) in the waters off the island of Kauai and the shallow waters of west Maui. Furthermore, the RIMPAC exercises (Rim of Pacific Exercises) that occur on a regular basis involve considerable Naval resources operating close to and within Hawaiian waters. The Pacific Navy is under considerable pressure from environmental groups that have initiated up to five law suits to curtail the Navy's use of active sonar for training. Perhaps the best approach in combating the various environmental concerns expressed in the different lawsuits is to gather scientific data and obtained important information on the abundance and distributions of marine mammals in the high Navy activity area of Hawaii. The ocean is large and the chances of avoiding any interaction with any sizable group of marine mammals are probably much greater than the probability of encountering marine mammals. However, the cost of negative encounters is disproportionately high in terms of negative publicity and law suits so it would be prudent to take steps to increase the odds against any encounters. So we return to the fact that basic information on the biology, natural history, and behavior of dolphins and whales that frequent waters of high Navy activities are needed in order to avoid encounters
Narrow-Band Sonar Signals of Small Cetaceans( )

1 edition published in 1991 in English and held by 0 WorldCat member libraries worldwide

The sonar signals of some of the smallest cetaceans are very similar to each other and very different than that of mid-sized cetaceans. Signals of Cephalorhynchus hectori, Cephalorhynchus commersonii (genus Cephalorhynchus), Phocoena phocoena, Neophocoena phocoena and Phocoenoides dalli (family phocoenidae) are compared with those of some larger dolphins. Signals of Tursiops truncatus, Delphinapterus leucas and Pseudorca crassidens, housed in Kaneohe Bay, Oahu, Hawaii, have peak frequencies between 100-200 kHz, with high amplitudes (210-225 dB re 1 microPa), short durations (50-70 micro s), and wide bandwidths (30-40 kHz). Some of the smaller cetaceans emit signals having peak frequencies between 120 and 140 kHz, with low amplitudes (<170 dB re 1 microPa), long durations (170-430 micro s) and narrow bandwidths (7-11 kHz). Double pulses are also emitted regularly by some of the smaller dolphins and very infrequently by the larger dolphins. Signals used by the smaller animals may reflect constraints associated with their small size and differences in generation mechanisms. For a given peak acoustic pressure, there is 3 to 4 times more energy in the signals of the smaller cetaceans. However, because of the narrower bandwidths, the distance resolution capability of the small cetacean signals is between 2 to 3.5 times inferior to that of the larger animals. Furthermore, the narrow bandwidth signals do not possess any doppler resolution properties. Marine biosystems, Marine biology
Feasibility of using acoustic DIFAR technology to localize and estimate Hawaiian humpback whale population by Whitlow W. L Au( )

1 edition published in 2001 in English and held by 0 WorldCat member libraries worldwide

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The sonar of dolphins
Alternative Names
Au, Whitlow W.

Au, Whitlow W. L.

Whitlow Au Expert in bioacoustics

English (65)

Hearing by whales and dolphinsPrinciples of marine bioacoustics