| TNT Biodegradation by Natural Microbial Assemblages at Estuarine Frontal Boundaries |
02 Jul 2012 |
57 pages |
| Authors:
Michael T Montgomery; Rchard B Coffin; Thomas J Boyd; Christopher L Osburn; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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 | This limited scope project primarily focused on whether estuarine transition zones (e.g., fronts, convergences, salt wedges) are sites of enhanced 2,4,6, Trinitrotoluene (TNT) mineralization, bacterial metabolism and degradation of aromatic organic matter. Evidence was gathered to determine what biogeochemical features of these transition zones may contribute to such differences. Criteria for success of this investigation included measuring elevated rates of TNT mineralization and bacterial growth in mixing zones between water ... |
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| TEMTADS Adjunct Sensor Systems Hand-Held EMI Sensor for Cued UXO Discrimination (ESTCP MR-200807) and Man-Portable EMI Array for UXO Detection and Discrimination (ESTCP MR-200909) |
05 Apr 2012 |
80 pages |
| Authors:
James B Kingdon; Bruce J Barrow; Thomas H Bell; David C George; Glenn R Harbaugh; Daniel A Steinhurst; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| Man-portable (MP) and Hand-held (HH) adjuncts of the NRL TEMTADS 5 5 array were constructed and the UXO classification performance of each characterized. Both systems are based on the transient electromagnetic induction (TEM) sensor technology that was developed for the NRL TEMTADS 5 5 array. Both systems are designed to be deployable in increasingly inaccessible areas where vehicle-towed sensor arrays cannot be used. Demonstration results for the MP system indicated ... |
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| 2011 ESTCP Live Site Demonstrations, Vallejo CA, ESTCP MR-1165, Demonstration Data Report, Former Mare Island Naval Shipyard, MTADS Discrimination Array, (TEMTADS) Survey |
05 Apr 2012 |
63 pages |
| Authors:
James B Kingdon; Thomas H Bell; Mark J Howard; Cora E Blits; Glenn R Harbaugh; Daniel A Steinhurst; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| The MTADS Discrimination Array (TEMTADS) 5x5 array was demonstrated at the former Mare Island Naval Shipyard, CA, during July 2011 as part of the ESTCP Live Site Demonstrations. The TEMTADS 5x5 array is vehicle-towed with array position and orientation determined with cm-level GPS. TEM data are collected at each target location while the vehicle and sensor array are stopped, with an on-target collection time of approximately 1.5 minutes. The data ... |
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| Determination of Nitrate Carry-Over on Bytac(registered) Strips Via Capillary Electrophoresis |
19 Jan 2012 |
8 pages |
| Authors:
Braden C Giordano; Cameron Lindsay; Adam Lubrano; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| Inorganic explosives including ammonium nitrate, urea nitrate, and ANFO are among the most common energetic materials used in home-made devices. The ability to detect these materials sensitively with low occurrences of false negatives and positives is of paramount importance. As new detection technologies are developed, the need to standardize procedures to evaluate these technologies is equally important. Most technologies include a sampling step; typically a substrate used to swipe a ... |
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| Numerical Simulations of Pressure Spikes within a Cylindrical Launch Tube due to a Bursting Helium Flask |
09 Nov 2011 |
16 pages |
| Authors:
Harold D Ladouceur; Benjamin Gould; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| A numerical model to simulate the bursting of a high-pressure flask of helium gas located within a cylindrical launch tube is described. The model provides an upper estimate for the launch tube wall pressures by assuming that the helium flask failure can be treated as a bursting balloon. The gas dynamic equations for the expansion of the 5000 psig helium region are solved utilizing the finite element program FlexPDE to ... |
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| Transient Electromagnetic Wave Propagation in a Plasma Waveguide |
24 Oct 2011 |
33 pages |
| Authors:
Harold D Ladouceur; Andrew P Baronavski; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| An analytic model to describe the transient propagation of an electromagnetic wave inside a hollow constant conductivity plasma annular tube is formulated. The model neglects external radiative emission since the plasma tube wall is assumed to be several skin depths in thickness. Approximate analytic time-dependent solutions for mode propagation are obtained by a combination of integral transform techniques and the method of eigenfunction expansion with homogeneous boundary conditions. The model ... |
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| 2011 ESTCP Live Site Demonstrations, Marysville, CA. ESTCP MR-1165, Demonstration Data Report, Former Camp Beale, TEMTADS MP 2x2 Cart Survey |
20 Oct 2011 |
48 pages |
| Authors:
James B Kingdon; Dean A Keiswetter; Thomas H Bell; Matthew Barner; Andrew Louder; Andrew Gascho; Tamir Klaff; Glenn R Harbaugh; Daniel A Steinhurst; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| The TEMTADS Man-Portable 2x2 sensor array was demonstrated at the former Camp Beale, CA during June 2011 as part of the ESTCP Live Site Demonstrations. New TEM sensors which replace the vertical-axis receive coils with triaxial receivers were used. Adding the horizontal receiver components improves the localization of the target. This system was designed to be deployable in areas inaccessible to vehicle-towed arrays. Data are collected at each target location ... |
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| ESTCP UXO Innovation Technology Transfer Project. ESTCP Project MM-0744: GEMTADS Demonstration at F.E. Warren AFB Demonstration Data Report |
06 JUN 2011 |
71 pages |
| Authors:
Nagi Khadr; Dean A. Keiswetter; Glenn R. Harbaugh; Daniel A. Steinhurst; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| A geophysical survey of two 9-acre areas within the boundary of the F.E. Warren AFB Closed Base Range MRA was conducted as part of the Environmental Security Technology Certification Program (ESTCP) Unexploded Ordnance (UXO) Innovative Technology Transfer Project. The survey was conducted using the Naval Research Laboratory (NRL) GEMTADS frequency-domain EMI sensor array. The two survey areas were selected from previous data in cooperation with the stakeholders to foster a ... |
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| Zero Power Buoyancy Control for Distributed Autonomous Sensor Networks Conducted During Crimson Viper 2010 Field Experiment |
04 Mar 2011 |
23 pages |
| Authors:
Lisa Fitzgerald; Justin Biffinger; Peter Wu; Michael Malito; Emily Petersen; Thomas Boyd; Bradley Ringeisen; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| The Office of Naval Research (ONR)/Naval Research Laboratory (NRL) Reserve Program (Program 38) was tasked to conduct an experiment on ONR and NRL technologies that were incorporated into the U.S. Marine Corps Forces Pacific (MARFORPAC) Experimentation Center (MEC) Crimson Viper 2010 (CV10) Field Experiment. This specific experiment addresses the Zero Power Ballast Control (ZPBC) for Distributed Autonomous Sensor Networks. The experiment was conducted by ONR Program 38 officers for the ... |
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| EMI Array for Cued UXO Discrimination |
07 Feb 2011 |
52 pages |
| Authors:
D C George; J B Kingdon; T Furuya; D A Keiswetter; T H Bell; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| A vehicle-towed array of time-domain electromagnetic sensors was designed and operated to optimize the classification of buried munitions from ancillary metallic debris and clutter. The array was designed to combine the data quality advantages of a gridded survey with the coverage efficiencies of a vehicular system. The design goal for this system was to collect data equal, if not better, in quality to the best gridded surveys while prosecuting many ... |
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| Microbial Gas Production Used to Achieve Autonomous Buoyancy Control |
01 Sep 2010 |
12 pages |
| Authors:
Peter K Wu; Lisa A Fitzgerald; Justin C Biffinger; Barry J Spargo; Bradley R Ringeisen; Brian H Houston; Joseph Bucaro; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| We have constructed and successfully laboratory tested a device that can periodically change from a submerged to a buoyant state using gas generated by microbes alone. The duration of the buoyant state and the switching frequency from the submerged to buoyant state can be controlled. If the type of microbes used is native to the deployment location, gas generation will not create an identifiable acoustic signature disclose the presence and ... |
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| Cooling System Design for PEM Fuel Cell Powered Air Vehicles |
18 Jun 2010 |
51 pages |
| Authors:
Richard O Stroman; Michael W Schuette; Gregory S Page; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| The Naval Research Laboratory (NRL) has developed a proton exchange membrane fuel cell (PEMFC) powered unmanned air vehicle (UAV) called the Ion Tiger. The Ion Tiger fuel cell produces 600 W electric (gross) and a comparable amount of waste heat that must be rejected by a cooling system. This study was undertaken to design a cooling system for the Ion Tiger and investigate cooling approaches that may be suitable for ... |
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| International Methane Hydrate Research and Development Workshop (6th) held in Bergen, Norway on May 13-15, 2008 |
22 Jul 2009 |
87 pages |
| Authors:
Bjorn Kvamme; Tsutomu Uchida; Hideo Narita; Richard Coffin; Stephen Masutani; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| This document reviews the 6th International Methane Hydrate Research and Development Workshop. Researchers from the Norway, Japan and United States have held a series of these workshops in Honolulu Hawaii, Washington, DC, Vina del Mar Chile, Victoria British Columbia, and Edinburgh, Scotland over the last eight years. The primary goals of the workshops are to develop collaborations in field and laboratory research in methane hydrate research that provides sharing of ... |
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| EM61-MK2 Response of Three Munitions Surrogates |
12-Mar-2009 |
31 pages |
| Authors:
H H Nelson; T Bell; J Kingdon; N Khadr; D A Steinhurst; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| Target response coefficients for three pipe nipples intended as surrogates for commonly encountered UXO items were calculated from measurements made using the recently developed NRL Time-domain Electromagnetic Induction array. These response coefficients were used to predict the signals expected from an EM61-MK2, the most commonly used geophysical survey instrument for UXO, for each of the three items as a function of orientation and distance of the center of the item ... |
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| EM61-MK2 Response of Standard Munition Items |
06-Oct-2008 |
36 pages |
| Authors:
H H Nelson; T Bell; J Kingdon; N Khadr; D A Steinhurst; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| Target response coefficients for 13 commonly encountered UXO items were calculated from measurements made using the recently developed NRL Time-domain Electromagnetic Induction array. These response coefficients were used to predict the signals expected from an EM61-MK2, the most commonly used geophysical survey instrument for UXO, for each of these items as a function of orientation and distance of the center of the item below the bottom coil of the sensor. ... |
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| Desalination Technology Waste Streams: Impact of pH and Brine on Bacterial Metabolism Among Natural Marine Assemblages |
10-Sep-2008 |
16 pages |
| Authors:
M T Montgomery; T J Boyd; C L Osburn; R E Plummer; R B Coffin; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| Hydrate formation-based techniques have been proposed as desalination technologies for transforming seawater into potable water. Marine Desalination Systems (MDS) is currently developing new technology in gas hydrate formation to supply potable water using hydrocarbon gas-based hydrate crystals (Kubota et al. 1984). The MDS technology might change the natural bacterial assemblage in primarily two ways: metabolic rate (secondary production) and assemblage composition. This influence on the microbial assemblage can affect ecosystem ... |
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| Bacterial Degradation of Nitrogenous Energetic Compounds (NEC) in Coastal Waters and Sediments |
10-Sep-2008 |
59 pages |
| Authors:
Michael T Montgomery; S W Walker; T J Boyd; L J Hamdan; C L Osburn; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| Once released in the environment, either through detonation, casing breakage, or by slow leaks from unexploded ordnance (UXO), nitrogenous energetic compounds (NEC, such as TNT, HMX, RDX) may sorb onto particulates, partition to dissolved organic matter, or remain dissolved in aqueous media. Our hypothesis was that NEC would be transient in coastal ecosystems. This was based primarily on the understanding that microbial grown in these systems is typically nitrogen-limited and ... |
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| Mechanical Design Report DARPA BOSS Program |
21 MAR 2008 |
84 pages |
| Authors:
Richard O. Stroman; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| Several prototype zoom (variable magnification) lens systems were developed for use with short-wave infrared cameras as part of the DARPA BOSS program at NRL. These zoom systems relied on novel GRIN (GRadient INdex) lenses, which were used in two ways. The first approach deformed the lenses to alter system magnification, while the second approach moved the lenses relative to one another. This report describes the mechanical designs of both a ... |
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| Impact of a Hydrate-Based Marine Desalination Technology on Marine Microbiota and Water Quality |
27 DEC 2006 |
22 pages |
| Authors:
Richard B. Coffin; Michael T. Montgomery; Christopher L. Osburn; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| Marine Desalination Systems (MDS) is currently developing new technology in gas hydrate formation to supply potable water. To scale this technology to support different country needs there is a requirement to assess the environmental impact of desalination. The NRL MDS collaboration on biological influence of marine desalination focuses on water quality of processed water and environmental impact of the marine desalination application. With this segment of the project accomplished, the ... |
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| International Workshop on Methane Hydrate Research and Development (4th) Held in Victoria, British Columbia, Canada on May 9-11, 2005 |
27 DEC 2006 |
147 pages |
| Authors:
Richard B. Coffin; Ross Chapman; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| The Fourth Workshop of the International Committee on Gas Hydrates Research and Development was held during 9-11 May 2005 in Victoria, British Columbia, Canada. Invited national agency representatives and international researchers from university, government, and industry convened to assess research priorities and to promote international collaboration on methane hydrate research. The 2.5-day workshop included plenary lectures and panel discussions, conducted as a working event where all participants engaged in open ... |
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| Actuator Trade-Off Analysis for DARPA/BOSS Prototype II |
13 DEC 2006 |
13 pages |
| Authors:
Richard O. Stroman; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| The servomotor actuation method used in the first flight prototype zoom lens was chosen because it is simple, small, lightweight, easily available, and can be rapidly integrated into existing UAV systems. Unfortunately, it has proven to be unsatisfactory in several ways. Commanding the servo to positions outside of its displacement-force envelope results in the PID controller "hunting" for the commanded position and burning out the motor. The gearing system linking ... |
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| Isotope Ratio Spectrometry Data Processing Software: Multivariate Statistical Methods for Hydrocarbon Source Identification and Comparison |
29 APR 2004 |
145 pages |
| Authors:
Thomas J. Boyd; Richard B. Coffin; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| The IRMS Data Processing software package is designed to allow easy stable isotope data entry and multivariate data analysis. When comparing two of more hydrocarbon samples using compound-specific isotope ratio mass spectrometry, an analyst obtains multiple data variables for each sample. Multivariate statistics allows rigorous comparison(s) to determine if the samples are in fact different and if so, how closely related they are. This software uses three main types of ... |
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| Environmental Security Technology Certification Program (ESTCP), Technology Demonstration Plan, MTADS Airborne and Vehicular Survey of Target S1 at Isleta Pueblo, Albuquerque, NM, 17 February - 2 March, 2003 |
31 MAR 2004 |
129 pages |
| Authors:
NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| Buried unexploded ordnance, UXO, is one of the Department of Defense' s most pressing environmental problems. Not limited to active ranges and bases, UXO contamination is present at DOD sites that are dormant and in areas adjacent to military ranges that are under the control of other government agencies and the private sector. Traditional methods for buried UXO detection, characterization, and remediation are laborintensive, slow and inefficient. Typical detection and ... |
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| MTADS Airborne and Vehicular Survey of Target S1 at Isleta Pueblo, Albuquerque, NM, 17 February-2 March 2003 |
31 MAR 2004 |
56 pages |
| Authors:
H. H. Nelson; David Wright; Tom Furuya; J. R. McDonald; Nagi Khadr; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| In February 2003, the Naval Research Laboratory demonstrated the Multi-sensor Towed Array Detection System (MTADS) vehicular and airborne magnetometer systems on the Pueblo of Isleta, near Albuquerque, NM. The demonstration consisted of two overlapping surveys. First, a vehicular magnetometery survey of 100 acres near the previously identified bull s eye, S1. Targets were expected to be M38 and BDU-33 practice bombs and an array of ordnance emplaced by the Army ... |
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| Long Wavelength Video-Based Event Detection, Preliminary Results from the CVNX and VS1 Test Series, ex-USS Shadwell, April 7-25, 2003 (CD-ROM) |
30 DEC 2003 |
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| Authors:
Daniel A. Steinhurst; Christian P. Minor; Jeffrey C. Owrutsky; Susan L. Rose-Pehrsson; Daniel T. Gottuk; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
 | ELECTRONIC FILE CHARACTERISTICS: 36 files; Adobe Acrobat (.PDF), MS Excel (.XLS) and Audio Video Interleave (.AVI). PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 611 MB. SYSTEMS DETAIL NOTE: ABSTRACT: This report documents results from long wavelength-response, or nightvision video detection (LWVD) of fire, smoke, and hot objects obtained during the CVNX and VS1 Test Series. The cameras demonstrated thermal imaging capabilities and an enhanced sensitivity to ... |
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| Spectral-Based Component of the Volume Sensor Program |
30 JUL 2003 |
26 pages |
| Authors:
J. C. Owrutsky; H. H. Nelson; D. A. Steinhurst; F. W. Williams; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| This report describes progress to date in the spectrally based component of the Volume Sensor (VS) Program at Naval Research Laboratory, in which the goal is to develop a remote, optical sensor for the detection of fire, smoke, and other hazardous events. Two distinct approaches to optical detection outside the visible are being pursued and the results to date are the subject of this report. These are long wavelength (near ... |
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| Phase I: FY01 Investigative Study for the Advanced Volume Sensor |
30 JUN 2003 |
28 pages |
| Authors:
Susan L. Rose-Pehrsson; Jeffrey C. Owrutsky; Daniel T. Gottuk; Justin A. Geiman; Frederick W. Williams; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| This report presents an overview of relevant resesarch and commercially available products as of FY01 that utilize spatial and spectral methods for fire detection systems. New capabilities are desired that can monitor damage control events in an entire space at a mimmal cost. Optical detection methods are being investigated because this technology offers an effective means to monitor the entire space or volume without relying on diffusion of effluents to ... |
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| Frequency-Domain Electromagnetic Induction Sensors for the Multi-Sensor Towed Array Detection System |
27 NOV 2002 |
19 pages |
| Authors:
H. H. Nelson; B. Barrow; T. Bell; R. S. Jones; B. SanFilipo; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| The Chemistry Division of the Naval Research Laboratory has developed the Multi-sensor Towed Array Detection System for use in unexploded ordnance detection and classification. With support from the Environmental Security Technology Certification Program, we are developing a frequency-domain electromagnetic induction sensor array to extend our capabilities. The first task in this program is to characterize the commercial GEM-3 sensor and assess its suitability for use in a towed array. In ... |
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| Fiber Optic Raman Spectroscopy for Detection of Methane Hydrates and Related Species |
19 DEC 2001 |
12 pages |
| Authors:
Sean J. Hart; Robert A. Lamontagne; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| A capillary waveguide fiber optic probe system has been constructed which is capable of rapidly collecting Raman spectra of organic compounds in water. It consists of a dual fiber optic probe coupled to a capillary waveguide designed to increase the volume of sample interrogated by the excitation light. A Nd:YAG laser operating at 532 nm is used to generate Raman scatter at the sample in the capillary which is transmitted ... |
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| Anacostia Wet Weather Receiving Water Monitoring Survey: Event 1 |
29 JAN 2001 |
122 pages |
| Authors:
J. W. Pohlman; C. S. Mitchell; C. M. Miller; R. B. Coffin; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| The Naval Research Laboratory (NRL) working in conjunction with the Metropolitan Washington Council of Governments (MWCOG) monitored overflows of the combined sewer system (CSS) and separate storm water system (SSWS) in the Anacostia River in the District of Columbia. The NRL/MWCOG contribution is part of a larger effort by the District of Columbia Water and Sewer Authority (WASA) to develop a Long Term Control Plan (LTCP) for the combined sewer ... |
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| Report on the Characterization of Calspan's 600 m3 Chamber in Preparation for the NOPP Aerosol Processes Experiments |
22 APR 1999 |
65 pages |
| Authors:
William Hoppel; Glendon Frick; Peter Caffrey; Louis Pasternack; Thomas Albrechcinski; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| Calspan's 600 m3 chamber was characterized in preparation for the National Oceanographic Participation Program (NOPP) Aerosol Processes Experiments. Both physical and chemical measurements were made to test the functioning of the chamber for nucleation and cloud processing experiments. |
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| Copper Sensor System for Unattended Marine Operations II: Development of a Polymer Sensor and Field Tests |
13 NOV 1998 |
69 pages |
| Authors:
R. A. Lamontagne; A. M. Ervin; J. W. Foerster; K. J. Ewing; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
|
| A major source of trace metal contamination in the marine environment is the copper containing anti-fouling paints on ship halls. This research examines the potential of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (Bathocuproine=BCP) embedded in the polymer, Nafion 117, for use as a reliable chemical for developing a sensor capable of measuring copper(I) in seawater. The sensor must have: (1) parts per billion (ppb) detection limits; (2) capable of operation in marine environments; (3) the ... |
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| Probabilistic Neural Networks for Chemical Sensor Array Pattern Recognition: Comparison Studies, Improvements and Automated Outlier Rejection |
10 MAR 98 |
33 pages |
| Authors:
Ronald Shaffer; Susan L. Rose-Pehrsson; R. A. McGill; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| For application to chemical sensor arrays, the ideal pattern recognition is accurate, fast, simple to train, robust to outliers, has low memory requirements, and has the ability to produce a measure of classification certainty. In this work, four data sets representing typical chemical sensor array data were used to compare seven pattern recognition algorithms nearest neighbor, Mahalanobis linear discriminant analysis, Bayesian linear discriminant analysis, SIMCA, back propagation neural networks, probabilistic ... |
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| Obscurants for Infrared Countermeasures |
17 DEC 1997 |
28 pages |
| Authors:
H. D. Ladouceur; A. P. Baronavski; H. H. Nelson; NAVAL RESEARCH LAB WASHINGTON DC CHEMICAL DYNAMICS AND DIAGNOSTICS BRANCH
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| The advent of imaging seekers in the 3-5 microns and 8-12 microns bands poses a new challenge in the area of infrared countermeasures. The next generation of seekers will be based on arrays that will provide me designer with a wide range of options for discriminating between enemy targets, friendly craft, and decoys. Area-extensive infrared countermeasures will be necessary to defeat these new seekers. One effective component of these countermeasures ... |
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