WorldCat Identities


Works: 1,149 works in 1,184 publications in 1 language and 1,198 library holdings
Classifications: GC67, 623.8205
Publication Timeline
Fiber-Optic Communication Links for Unmanned Inspection Submersibles( Book )

1 edition published in 1980 in English and held by 4 WorldCat member libraries worldwide

Periodic inspection of undersea pipelines and offshore structures requires depth capabilities in excess of those which are economical with divers (ie, 100 meters). Free-swimming, unmanned undersea vehicles operating in the supervisory-controlled mode (ie, man-in-the-loop) are being considered as a possible solution to the deep, undersea inspection problem. Specifically, an expendable optical fiber data link is proposed as a means to provide the wide-bandwidth, high-quality, bidirectional communications essential to advanced-sensor/real-time man-in-the-loop capabilities of such inspection vehicles. (Author)
CURV III (Cable-Controlled Underwater Recovery Vehicle) Characteristics and Mission Applications( Book )

3 editions published in 1984 in English and held by 4 WorldCat member libraries worldwide

The Cable Controlled Underwater Recovery Vehicle (CURV) is a versatile and easily adaptable multi-purpose work vehicle capable of performing search and recovery tasks as well as pursuing test, evaluation, exploration, and work projects. (Author)
The New MININEC (Version 3). A Mini-Numerical Electromagnetic Code by J. C Logan( Book )

3 editions published between 1986 and 1987 in English and held by 3 WorldCat member libraries worldwide

The Mini ELECTROMAGNETICS Code, or MININEC, is a method of Moments computer programs for analysis of thin wire antennas. A Galerkin procedure is applied to an electric field integral equation to solve for the wire currents. This formulation results in an unusually short computer program suitable for implementation on a microcomputer. Hence, MININEC is written in a BASIC language compatible with many popular microcomputers. Keywords: Radiation pattern options; Magnetic fields; Modular programming
Advanced Mail Systems Scanner Technology. Executive Summary and Appendixes A-D( Book )

3 editions published between 1977 and 1979 in English and held by 3 WorldCat member libraries worldwide

The objective of the effort described herein is to provide technical consultation, equipment, and support services to the US Postal Service which will contribute to the development of the system definition of a new-concept processing system, the Electronic Message Service (EMS). Included in the scope of effort are investigations of highspeed image scanning technology, image frame memory storage, image enhancement, and the fabrication of a scanner/frame-store memory test assembly. The fourth annual report briefly describes the individual efforts of the reporting period in an executive summary and provides in-depth data in four appendixes: Advanced Illumination Correction; Document Data Base; Paper Reflectance as a Function of Data Density as Seen by a High-Resolution Reflectometer; and Image Capture and Analysis System-System Operator's Manual. (Author)
Worldwide Distribution of Pilot Whales and Killer Whales by Stephen Leatherwood( Book )

1 edition published in 1978 in English and held by 2 WorldCat member libraries worldwide

This report summarizes what is known and can reasonably be predicted about the distribution and seasonal movements of two small toothed whales: the pilot whale (Globicephala spp.) and the killer whale (Orcinus orca). For both whales the following kinds of information are given: (1) A written summary describing distribution by major oceanographic area; these summaries include detailed information, derived from the best published reports, on local distribution and seasonal abundance; (2) Two world maps, one bearing a summary statement about distribution in each area for which information is available, and the other bearing numerical values indicating the likelihood of occurrence in each 5-degree sector of ocean throughout the world; and (3) A bibliography of the sources used to compile the distribution data. (Author)
Analytical Procedures for Extractable Organotins in Soft Tissues of Marine Organisms( Book )

1 edition published in 1987 in English and held by 2 WorldCat member libraries worldwide

A method for isolating extractable tributyltin and dibutyltin from soft tissues of marine organisms is presented. Analyses by graphite furnace atomic absorption spectrophotometry and by gas chromatography with both flame ionization detection and mass spectrometry are described. There has been increasing national and international concern about the effects of tributylins on the marine environment . Tributyltins (TBT) are introduced into the waterways predominantly from their use as antifouling agents in marine paints. These coatings, which release the biocide into the water column, are extensively used on commercial and recreational vessels and are proposed for use on naval ships in the near future. Due to toxic nature of TBT, there is an extreme need to assess its impact and fate in relation to non-target organisms. To evaluate the interactive roles of TBT and marine organisms, it is necessary to effectively isolate, identify, and quantify TBT and, at times, its alleged degradation products, di- and monobutyltins (DBT and MBT). The analytical procedures presented here are those currently used to quantify either (a) extractable TBT only, or (b) both TBT and DBT in various marine organisms. Because it is doubtful that any one method will be effective in all situations, development of the analytical procedures is an ongoing process. For this reason, it is stressed that the procedures presented here are (at the time of this writing) most effective for the samples encountered in this laboratory. The thorough (almost cookbook style) presentation is meant to inform the reader of the complete methods currently in use at NOSC and is by no means intended to be an analytical code or rule
HF (High Frequency) Maximum Usable Frequency (MUF) Model Uncertainty Assessment( Book )

2 editions published in 1987 in English and held by 2 WorldCat member libraries worldwide

To assess the accuracy of MUF model prediction, a statistical analysis of observed oblique sounder median maximum observed frequencies (MOF) and predicted maximum usable frequencies (MUF) was conducted. A data base consisting of 13,054 hours of oblique sounder MOFs measured on 70 paths were compared against the predicted MUF values from MINIMUF-3.5, MINIMUF 85 and an unrelated MUF model, the HF Broadcast WARC Model (HFBC 84). The data was screened into subsets to determine the effect of particular paths, path length and orientation, season, month, latitude, sunspot number, diurnal trends, geographic region and sounder type. The accuracy of all three models was very close, with the MINIMUF-3.5 model having the lowest rms error of 4.44 MHz. MINIMUF 85 was next with an rms error of 4.58 MHz and HFBC 84 was last with an error of 4.67 MHz. Correlation was good for all three models. Coefficients were .824, .819 and .827 for MINIMUF-3.5, MINIMUF 85 and HFBC 84, respectively. The primary difference between MINIMUF-3.5 and MINIMUF 85 appeared when detailed analysis of the accuracies was conducted. When the variation in error was noted as a function of season, sunspot number, or range, for instance, there was less variation in the accuracy of MINIMUF 85
LUF (Lowest Usable Frequency) Model Uncertainty Assessment( Book )

2 editions published in 1987 in English and held by 2 WorldCat member libraries worldwide

A statistical analysis of observed oblique sounder lowest observed frequency (LOF) and predicted lowest usable frequency (LUF) was to assess the accuracy of the PROPHET algorithm QLOF version 2.0. A LOF data base of 1814 LOFs from 29 paths was established for the assessment. The data was screened into subsets to determine the effect of particular paths, universal and local time, sounder type, path length and orientation, season, month, sunspot number, and mid-path latitude. Version 2.0 had a bias of 0.55 MHz low, an rms error of 1.95 MHz, and a correlation coefficient with the observed data of 0.89. The rms error increases with increasing range. A higher residual was noted for the months of July through October. An increase in residual at midlatitude was noted. Reasons for these errors are given. A modification to the absorption index term which determines the latitudinal and seasonal variation is suggested
U.S. Navy Statutory Monitoring of Tributyltin in Selected U.S. Harbors by P. F Seligman( Book )

2 editions published in 1990 in English and held by 2 WorldCat member libraries worldwide

In compliance with the requirements of the Organotin Antifouling Paint Control Act of 1988, the U.S. Navy has initiated a harbor monitoring program. Under Section 7(b) of the act-Navy Home Port Monitoring-the U.S. Navy is required to' ... provide for periodic monitoring, not less than quarterly, of waters serving as the home port for any Naval Vessel coated with an antifouling paint containing organotin to determine the concentration of organotin in the water column, sediments, and aquatic organisms of such waters. A baseline survey of water-column tributyltin concentrations was conducted in 15 Navy harbors between 1984 and 1986. These data were used in the U.S. Navy's environmental risk assessment and supported initiation of the U.S. EPA Special Review. In compliance with the requirements of the Organotin Antifouling Paint Control Act, a quarterly monitoring program has been initiated to do the following: (1) Document butyltin concentrations in water, tissues, and sediments within harbors that serve as a home port for Navy vessels coated with organotin antifouling paint; and (2) Determine if TBT concentrations are changing significantly over time in relation to Navy use patterns. (kr)
Direct Execution Language Architecture for Simulation( Book )

1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide

The study presented in this report addresses the application of direct execution computer architecture concepts using low-cost, large-scale-integration (LSI) to continuous system simulation. Basic architecture schemes for direct execution systems were investigated and applied to a demonstration interactive simulation language. A dual processor direct execution system was designed and built using an LSI-11 microcomputer, a 16K x 16 dual port memory, a microprogrammed AMD 2900 bit-slice direct execution processor, and a 16 x 16 multiplier chip. The system features a distinct separation of interpretive/compiler software and simulation run execution firmware linked via the dual port. The system is demonstrated via several simulation examples including realtime control, optimization, and torpedo dynamics problems. (Author)
Acute Effects of (Bis)tributyltin Oxide on Marine Organisms. Summary of Work Performed 1981 to 1983( Book )

1 edition published in 1989 in English and held by 2 WorldCat member libraries worldwide

The acute effects of bis(tri-n-butyltin)oxide (TBTO) on six species of marine invertebrates were assessed to determine the relative toxicity of TBTO to a variety of organisms, and these results were compared with copper toxicity. Survival was the parameter measured for each species. Results indicated that TBTO was significantly more toxic than copper to all species by a factor of 10. In addition, organotin toxicity was roughly proportional to the number of butyl groups, i.e., monobutyltin less toxic than dibutyltin which was less toxic than tributyltin. The species tested fell into two categories: resistant and sensitive. The 96-hour LC50S ranged between 15 amd 30 parts per billion (ppb) TBTO for the reistant species, which included Protothaca staminea, Mytilus edulis, Citharichthys stigmaeus, and Neanthes arenaceodentata. The 96-hour LC50S ranged between 1- and 2-ppb TBTO for the sensitive species, which included Metamysidopis elongata and Acartia tonsa. Keywords: Antifouling coatings; Toxicity. (KT)
Combined Stimulus Control of Peak Frequency and Source Level in the Echolocating Dolphin (Tursiops truncatus by Deborah A Pawloski( Book )

2 editions published between 1988 and 1989 in English and held by 2 WorldCat member libraries worldwide

Research trainers demonstrated stimulus control over dolphin echolocation emission in past discrimination studies. Other research revealed control can also be exerted over emitted source levels during detection studies. Combined control over the peak frequency and the source level of the echolocation emission of the dolphin has recently been achieved to 85% performance levels. The dolphin is trained to emit clicks from a fixed position on a bite-plate/tail-rest station to ensure accuracy in click evaluation. Sessions are conducted in a pre-determined random schedule of testing. A collecting hydrophone relays echolocation clicks to a microcomputer system which reinforces the animal when criterion is satisfied. Initial training consists of shifting the source level (or amplitude) of the echolocation clicks while solving a detection task. The separate discriminative stimuli of two underwater tones gain control over high and low amplitude levels of the emitted clicks. A third one, with two distinct repetition rates, is used to train the control over peak frequency output. The separate behaviors are combined by superimposing the repetition rate of the peak frequency stimulus over the pure tone of the amplitude stimulus
RTR studies of closed combustion of liquid metal fuels by L. A Parnell( Book )

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

The use of liquid metal combustion as a Rankine cycle heat source in stored chemical energy propulsion systems for undersea vehicles has fostered interest in the fundamental processes occurring during such combustion. This paper reports an investigation into the use of high energy, real-time radiography to provide X ray images of the confined combustion of an oxidant injected and submerged in a fuel bath. Studies of the combustion processes and fluid dynamics of the jet driven circulating flow in the fuel bath are described. Results of tests using cylindrical combustors which have single, horizontal oxidizer jets at their centerlines are presented. Selected radiographic images showing some of the large scale, low frequency turbulence, dense product behavior and reaction zone growth which occurs during such closed combustion processes are presented and discussed. Keywords: Rankine cycle, Liquids metal combustion, Cylindrical combustors, Fuel bath
Experience with Neural Networks at Naval Ocean Systems Center( Book )

2 editions published in 1988 in English and held by 1 WorldCat member library worldwide

Neural networks have undergone a resurgence of late, due to the work of Hopfield, Grossberg and others. They have the potential for applications in a wide range of areas, including signal processing, image processing, planning, control, and data fusion. In this paper we will address the applications being explored at NOSC. The author describes experiences with two neural network products currently being marketed: the Hecht-Nielsen Anza Neurocomputer and the SAIC Sigma-1 Neurocomputer. The projects will be grouped by the NOSC branch. In each case a point of contact will be given, though of course there may be others working on each project. From the wide range of problems being addressed, it is clear that the Navy has a strong interest in neural networks, and believes that they are well suited to a wide range of applications. The authors are in Code 421, and as such have complete knowledge of the neural network research ongoing in Code 421. The descriptions of the work being done elsewhere at NOSC are based on varying degrees of interaction. For many, first hand knowledge of the research is present. The authors are in fact working directly with many groups outside their own code. For others, the interaction is not as thorough. In any case, the interested reader should contact the specific group indicated for a more depth discussion of the work described herein. Keywords: Command and control, Electro-optical, Opto-electronic devices
Advanced Tethered Vehicle, Design, and Description( Book )

2 editions published in 1991 in English and held by 1 WorldCat member library worldwide

The Advanced Tethered Vehicle (ATV) is a self-contained, remotely operated submersible system designed to carry out Navy work missions at ocean depths to 20,000 feet. It consists of a submersible vehicle, tether cable, handling system, control station, and auxiliary equipment. The vehicle is positively buoyant and carries two force feedback manipulators and interchangeable tools for performing work. The system has completed a rigorous test program that accumulated 248 operating hours and concluded with a successful dive to 20,600 feet. (Author)
A Measurement-Free Approach to Conditioning( Book )

2 editions published in 1987 in English and held by 1 WorldCat member library worldwide

In an earlier paper, a new theory of measure-free conditional objects was presented. In this paper, emphasis is placed upon the motivation of the theory. The central part of this motivation is established through an example involving a knowledge-based system. In order to evaluate combination of evidence for this system, using observed data, auxiliary attribute and diagnosis variables, and inference rules connecting them, one must first choose an appropriate algebraic logic description pair (ALDP): a formal language or syntax followed by a compatible logic or semantic evaluation (or model). Three common choices- for this highly non-unique choice - are briefly discussed, the logics being Classical Logic, Fuzzy Logic, and Probability Logic. In all three, the key operator representing implication for the inference rules is interpreted as the often-used disjunction of a negation for any events a, b
Geometric Characterization of Eigenvalues of Covariance Matrix for Two- Source Array Processing( )

2 editions published in 1991 in English and held by 0 WorldCat member libraries worldwide

For a two-source array processing scenario, normalized eigenvalues' expressions lambda sub 1 and lambda sub 2 are reduced to forms depending only on a real triplet: phase-dependent, variable xi, phase-independent variable eta, and a certain power ratio is confined to an isosceles-like region. We characterize: (1) this isosceles-like region and the many-to-one mapping from the Cartesian product of the temporal and spatial correlation unit-disks onto this region; (2) the behavior of the eigenvalues and their ratio as functions of the real triplet with respect to array processing, and; (3) a characterization of Speiser's eigenvalues bounds specialized to the two source scenario
Ocean Engineering Studies Compiled 1991. Volume 11. Pressure-Resistant Glass Light Enclosures( )

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

Manned and unmanned diving systems require underwater lights for illumination to illuminate search and work areas. Electric light bulbs can neither tolerate the temperature shock resulting from immersion in cold water nor the pressure exerted by water at operational depth. They must be protected by transparent enclosures capable of withstanding the sudden immersion in cold water and long-term compression by external hydrostatic pressure. Low thermal conductivity of plastics, impedes heat dissipation from the interior of the plastic enclosure to the water. Only enclosures fabricated from borosilicate or pure silica glass with very low temperature expansion coefficient can satisfy operational requirements. The low coefficient of thermal expansion, coupled with high heat transfer capability, allows enclosures from this group of glasses to operate successfully with a very high temperature differential across the wall thickness. These glasses also possess compressive strength exceeding 200,000 psi. This property allows such enclosures to be constructed with very thin walls, thus further improving the heat transfer from the inside of these enclosures to the cold water outside. Testing involved establishing the critical pressure and cyclic fatigue life of glass enclosures due to (1) the effect of enclosure shape, (2) type of bulkhead, (3) the configuration of mating surfaces, and (4) gasket material used. Three types of glass enclosures were investigated: cylindrical domes with conical flanges, pipes with conical flanges, and tubes without flanges
Combined Acoustic Propagation in Eastpac Region (Exercise CAPER): Initial Acoustic Analysis( )

1 edition published in 1978 in English and held by 0 WorldCat member libraries worldwide

This report presents an initial acoustic assessment of Exercise CAPER, which was conducted during August 1974 in an area about 830 km west of San Diego, California. The principal objective of this exercise was to measure experimentally the interference of CW signals caused by a well-surveyed isolated seamount, in this case Stoddard Seamount. The report discusses three major areas of analysis. The first area is the convolution of ray diagrams with the bathymetry of the seamount in order to delineate the shadow zones formed behind the seamount. The second area is the detailed comparison of acoustic ranges and satellite navigation ranges. The third area is to assess the effect of range- dependent profiles as measured on CAPER. The design and execution of the various seamount shadowing runs well satisfy the goals of the exercise. The major effect of the seamount is to intercept the leading portion of the convergence zones. Comparison of the differences between 52 acoustic and satellite ranges showed a mean difference of 117 m with a standard deviation of 272 m. The maximum difference was -726 m, while 88 % of the differences fell within + or - 366 m. There was propagation through four distinct near-surface water masses. A comparison of ray calculations for a single profile appropriate for the receiver with calculations using all four profiles demonstrated the importance of horizontal change. Range differences of as much as 13.2 km were calculated for the eighth convergence zone. Sound speeds within 18 km of the seamount peak were about 0.22 microsec higher than in the surrounding ocean for depths from 1000 to 2500 m
Security Considerations for Autonomous Robots( )

2 editions published between 1988 and 1990 in English and held by 0 WorldCat member libraries worldwide

The security aspects of autonomous robots are analyzed by modeling a robot as a set of sensors, effectors, optional communications resources, and processing elements whose behavior is tightly coupled to be sensed characteristics of its environment. A simple taxonomy of potential generic threat types is presented, comprising both the possible direct external threat paths and the derived consequent internal threat states. Several generic countermeasure strategies are proposed
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